/* Copyright (C) 2000-2006 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* Insert of records */ /* INSERT DELAYED Insert delayed is distinguished from a normal insert by lock_type == TL_WRITE_DELAYED instead of TL_WRITE. It first tries to open a "delayed" table (delayed_get_table()), but falls back to open_and_lock_tables() on error and proceeds as normal insert then. Opening a "delayed" table means to find a delayed insert thread that has the table open already. If this fails, a new thread is created and waited for to open and lock the table. If accessing the thread succeeded, in Delayed_insert::get_local_table() the table of the thread is copied for local use. A copy is required because the normal insert logic works on a target table, but the other threads table object must not be used. The insert logic uses the record buffer to create a record. And the delayed insert thread uses the record buffer to pass the record to the table handler. So there must be different objects. Also the copied table is not included in the lock, so that the statement can proceed even if the real table cannot be accessed at this moment. Copying a table object is not a trivial operation. Besides the TABLE object there are the field pointer array, the field objects and the record buffer. After copying the field objects, their pointers into the record must be "moved" to point to the new record buffer. After this setup the normal insert logic is used. Only that for delayed inserts write_delayed() is called instead of write_record(). It inserts the rows into a queue and signals the delayed insert thread instead of writing directly to the table. The delayed insert thread awakes from the signal. It locks the table, inserts the rows from the queue, unlocks the table, and waits for the next signal. It does normally live until a FLUSH TABLES or SHUTDOWN. */ #include "mysql_priv.h" #include "sp_head.h" #include "sql_trigger.h" #include "sql_select.h" #include "slave.h" #ifndef EMBEDDED_LIBRARY static bool delayed_get_table(THD *thd, TABLE_LIST *table_list); static int write_delayed(THD *thd,TABLE *table, enum_duplicates dup, bool ignore, char *query, uint query_length, bool log_on); static void end_delayed_insert(THD *thd); pthread_handler_t handle_delayed_insert(void *arg); static void unlink_blobs(register TABLE *table); #endif static bool check_view_insertability(THD *thd, TABLE_LIST *view); /* Define to force use of my_malloc() if the allocated memory block is big */ #ifndef HAVE_ALLOCA #define my_safe_alloca(size, min_length) my_alloca(size) #define my_safe_afree(ptr, size, min_length) my_afree(ptr) #else #define my_safe_alloca(size, min_length) ((size <= min_length) ? my_alloca(size) : my_malloc(size,MYF(0))) #define my_safe_afree(ptr, size, min_length) if (size > min_length) my_free(ptr,MYF(0)) #endif /* Check that insert/update fields are from the same single table of a view. SYNOPSIS check_view_single_update() fields The insert/update fields to be checked. view The view for insert. map [in/out] The insert table map. DESCRIPTION This function is called in 2 cases: 1. to check insert fields. In this case *map will be set to 0. Insert fields are checked to be all from the same single underlying table of the given view. Otherwise the error is thrown. Found table map is returned in the map parameter. 2. to check update fields of the ON DUPLICATE KEY UPDATE clause. In this case *map contains table_map found on the previous call of the function to check insert fields. Update fields are checked to be from the same table as the insert fields. RETURN 0 OK 1 Error */ bool check_view_single_update(List &fields, TABLE_LIST *view, table_map *map) { /* it is join view => we need to find the table for update */ List_iterator_fast it(fields); Item *item; TABLE_LIST *tbl= 0; // reset for call to check_single_table() table_map tables= 0; while ((item= it++)) tables|= item->used_tables(); /* Check found map against provided map */ if (*map) { if (tables != *map) goto error; return FALSE; } if (view->check_single_table(&tbl, tables, view) || tbl == 0) goto error; view->table= tbl->table; *map= tables; return FALSE; error: my_error(ER_VIEW_MULTIUPDATE, MYF(0), view->view_db.str, view->view_name.str); return TRUE; } /* Check if insert fields are correct. SYNOPSIS check_insert_fields() thd The current thread. table The table for insert. fields The insert fields. values The insert values. check_unique If duplicate values should be rejected. NOTE Clears TIMESTAMP_AUTO_SET_ON_INSERT from table->timestamp_field_type or leaves it as is, depending on if timestamp should be updated or not. RETURN 0 OK -1 Error */ static int check_insert_fields(THD *thd, TABLE_LIST *table_list, List &fields, List &values, bool check_unique, table_map *map) { TABLE *table= table_list->table; if (!table_list->updatable) { my_error(ER_NON_INSERTABLE_TABLE, MYF(0), table_list->alias, "INSERT"); return -1; } if (fields.elements == 0 && values.elements != 0) { if (!table) { my_error(ER_VIEW_NO_INSERT_FIELD_LIST, MYF(0), table_list->view_db.str, table_list->view_name.str); return -1; } if (values.elements != table->s->fields) { my_error(ER_WRONG_VALUE_COUNT_ON_ROW, MYF(0), 1L); return -1; } #ifndef NO_EMBEDDED_ACCESS_CHECKS if (grant_option) { Field_iterator_table_ref field_it; field_it.set(table_list); if (check_grant_all_columns(thd, INSERT_ACL, &field_it)) return -1; } #endif clear_timestamp_auto_bits(table->timestamp_field_type, TIMESTAMP_AUTO_SET_ON_INSERT); } else { // Part field list SELECT_LEX *select_lex= &thd->lex->select_lex; Name_resolution_context *context= &select_lex->context; Name_resolution_context_state ctx_state; int res; if (fields.elements != values.elements) { my_error(ER_WRONG_VALUE_COUNT_ON_ROW, MYF(0), 1L); return -1; } thd->dupp_field=0; select_lex->no_wrap_view_item= TRUE; /* Save the state of the current name resolution context. */ ctx_state.save_state(context, table_list); /* Perform name resolution only in the first table - 'table_list', which is the table that is inserted into. */ table_list->next_local= 0; context->resolve_in_table_list_only(table_list); res= setup_fields(thd, 0, fields, 1, 0, 0); /* Restore the current context. */ ctx_state.restore_state(context, table_list); thd->lex->select_lex.no_wrap_view_item= FALSE; if (res) return -1; if (table_list->effective_algorithm == VIEW_ALGORITHM_MERGE) { if (check_view_single_update(fields, table_list, map)) return -1; table= table_list->table; } if (check_unique && thd->dupp_field) { my_error(ER_FIELD_SPECIFIED_TWICE, MYF(0), thd->dupp_field->field_name); return -1; } if (table->timestamp_field && // Don't set timestamp if used table->timestamp_field->query_id == thd->query_id) clear_timestamp_auto_bits(table->timestamp_field_type, TIMESTAMP_AUTO_SET_ON_INSERT); } // For the values we need select_priv #ifndef NO_EMBEDDED_ACCESS_CHECKS table->grant.want_privilege= (SELECT_ACL & ~table->grant.privilege); #endif if (check_key_in_view(thd, table_list) || (table_list->view && check_view_insertability(thd, table_list))) { my_error(ER_NON_INSERTABLE_TABLE, MYF(0), table_list->alias, "INSERT"); return -1; } return 0; } /* Check update fields for the timestamp field. SYNOPSIS check_update_fields() thd The current thread. insert_table_list The insert table list. table The table for update. update_fields The update fields. NOTE If the update fields include the timestamp field, remove TIMESTAMP_AUTO_SET_ON_UPDATE from table->timestamp_field_type. RETURN 0 OK -1 Error */ static int check_update_fields(THD *thd, TABLE_LIST *insert_table_list, List &update_fields, table_map *map) { TABLE *table= insert_table_list->table; query_id_t timestamp_query_id; LINT_INIT(timestamp_query_id); /* Change the query_id for the timestamp column so that we can check if this is modified directly. */ if (table->timestamp_field) { timestamp_query_id= table->timestamp_field->query_id; table->timestamp_field->query_id= thd->query_id - 1; } /* Check the fields we are going to modify. This will set the query_id of all used fields to the threads query_id. */ if (setup_fields(thd, 0, update_fields, 1, 0, 0)) return -1; if (insert_table_list->effective_algorithm == VIEW_ALGORITHM_MERGE && check_view_single_update(update_fields, insert_table_list, map)) return -1; if (table->timestamp_field) { /* Don't set timestamp column if this is modified. */ if (table->timestamp_field->query_id == thd->query_id) clear_timestamp_auto_bits(table->timestamp_field_type, TIMESTAMP_AUTO_SET_ON_UPDATE); else table->timestamp_field->query_id= timestamp_query_id; } return 0; } /* Prepare triggers for INSERT-like statement. SYNOPSIS prepare_triggers_for_insert_stmt() thd The current thread table Table to which insert will happen duplic Type of duplicate handling for insert which will happen NOTE Prepare triggers for INSERT-like statement by marking fields used by triggers and inform handlers that batching of UPDATE/DELETE cannot be done if there are BEFORE UPDATE/DELETE triggers. */ void prepare_triggers_for_insert_stmt(THD *thd, TABLE *table, enum_duplicates duplic) { if (table->triggers) { if (table->triggers->has_triggers(TRG_EVENT_DELETE, TRG_ACTION_AFTER)) { /* The table has AFTER DELETE triggers that might access to subject table and therefore might need delete to be done immediately. So we turn-off the batching. */ (void) table->file->extra(HA_EXTRA_DELETE_CANNOT_BATCH); } if (table->triggers->has_triggers(TRG_EVENT_UPDATE, TRG_ACTION_AFTER)) { /* The table has AFTER UPDATE triggers that might access to subject table and therefore might need update to be done immediately. So we turn-off the batching. */ (void) table->file->extra(HA_EXTRA_UPDATE_CANNOT_BATCH); } mark_fields_used_by_triggers_for_insert_stmt(thd, table, duplic); } } /* Mark fields used by triggers for INSERT-like statement. SYNOPSIS mark_fields_used_by_triggers_for_insert_stmt() thd The current thread table Table to which insert will happen duplic Type of duplicate handling for insert which will happen NOTE For REPLACE there is no sense in marking particular fields used by ON DELETE trigger as to execute it properly we have to retrieve and store values for all table columns anyway. */ void mark_fields_used_by_triggers_for_insert_stmt(THD *thd, TABLE *table, enum_duplicates duplic) { if (table->triggers) { table->triggers->mark_fields_used(thd, TRG_EVENT_INSERT); if (duplic == DUP_UPDATE) table->triggers->mark_fields_used(thd, TRG_EVENT_UPDATE); } } /** Upgrade table-level lock of INSERT statement to TL_WRITE if a more concurrent lock is infeasible for some reason. This is necessary for engines without internal locking support (MyISAM). An engine with internal locking implementation might later downgrade the lock in handler::store_lock() method. */ static void upgrade_lock_type(THD *thd, thr_lock_type *lock_type, enum_duplicates duplic, bool is_multi_insert) { if (duplic == DUP_UPDATE || duplic == DUP_REPLACE && *lock_type == TL_WRITE_CONCURRENT_INSERT) { *lock_type= TL_WRITE_DEFAULT; return; } if (*lock_type == TL_WRITE_DELAYED) { /* We do not use delayed threads if: - we're running in the safe mode or skip-new mode -- the feature is disabled in these modes - we're executing this statement on a replication slave -- we need to ensure serial execution of queries on the slave - it is INSERT .. ON DUPLICATE KEY UPDATE - in this case the insert cannot be concurrent - this statement is directly or indirectly invoked from a stored function or trigger (under pre-locking) - to avoid deadlocks, since INSERT DELAYED involves a lock upgrade (TL_WRITE_DELAYED -> TL_WRITE) which we should not attempt while keeping other table level locks. - this statement itself may require pre-locking. We should upgrade the lock even though in most cases delayed functionality may work. Unfortunately, we can't easily identify whether the subject table is not used in the statement indirectly via a stored function or trigger: if it is used, that will lead to a deadlock between the client connection and the delayed thread. */ if (specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE) || thd->variables.max_insert_delayed_threads == 0 || thd->prelocked_mode || thd->lex->uses_stored_routines()) { *lock_type= TL_WRITE; return; } if (thd->slave_thread) { /* Try concurrent insert */ *lock_type= (duplic == DUP_UPDATE || duplic == DUP_REPLACE) ? TL_WRITE : TL_WRITE_CONCURRENT_INSERT; return; } bool log_on= (thd->options & OPTION_BIN_LOG || ! (thd->security_ctx->master_access & SUPER_ACL)); if (log_on && mysql_bin_log.is_open() && is_multi_insert) { /* Statement-based binary logging does not work in this case, because: a) two concurrent statements may have their rows intermixed in the queue, leading to autoincrement replication problems on slave (because the values generated used for one statement don't depend only on the value generated for the first row of this statement, so are not replicable) b) if first row of the statement has an error the full statement is not binlogged, while next rows of the statement may be inserted. c) if first row succeeds, statement is binlogged immediately with a zero error code (i.e. "no error"), if then second row fails, query will fail on slave too and slave will stop (wrongly believing that the master got no error). So we fall back to non-delayed INSERT. */ *lock_type= TL_WRITE; } } } /** Find or create a delayed insert thread for the first table in the table list, then open and lock the remaining tables. If a table can not be used with insert delayed, upgrade the lock and open and lock all tables using the standard mechanism. @param thd thread context @param table_list list of "descriptors" for tables referenced directly in statement SQL text. The first element in the list corresponds to the destination table for inserts, remaining tables, if any, are usually tables referenced by sub-queries in the right part of the INSERT. @return Status of the operation. In case of success 'table' member of every table_list element points to an instance of class TABLE. @sa open_and_lock_tables for more information about MySQL table level locking */ static bool open_and_lock_for_insert_delayed(THD *thd, TABLE_LIST *table_list) { DBUG_ENTER("open_and_lock_for_insert_delayed"); #ifndef EMBEDDED_LIBRARY if (delayed_get_table(thd, table_list)) DBUG_RETURN(TRUE); if (table_list->table) { /* Open tables used for sub-selects or in stored functions, will also cache these functions. */ if (open_and_lock_tables(thd, table_list->next_global)) { end_delayed_insert(thd); DBUG_RETURN(TRUE); } /* First table was not processed by open_and_lock_tables(), we need to set updatability flag "by hand". */ if (!table_list->derived && !table_list->view) table_list->updatable= 1; // usual table DBUG_RETURN(FALSE); } #endif /* * This is embedded library and we don't have auxiliary threads OR * a lock upgrade was requested inside delayed_get_table because - there are too many delayed insert threads OR - the table has triggers. Use a normal insert. */ table_list->lock_type= TL_WRITE; DBUG_RETURN(open_and_lock_tables(thd, table_list)); } /** INSERT statement implementation */ bool mysql_insert(THD *thd,TABLE_LIST *table_list, List &fields, List &values_list, List &update_fields, List &update_values, enum_duplicates duplic, bool ignore) { int error, res; bool transactional_table, joins_freed= FALSE; bool changed; bool was_insert_delayed= (table_list->lock_type == TL_WRITE_DELAYED); uint value_count; ulong counter = 1; ulonglong id; COPY_INFO info; TABLE *table= 0; List_iterator_fast its(values_list); List_item *values; Name_resolution_context *context; Name_resolution_context_state ctx_state; #ifndef EMBEDDED_LIBRARY char *query= thd->query; /* log_on is about delayed inserts only. By default, both logs are enabled (this won't cause problems if the server runs without --log-update or --log-bin). */ bool log_on= (thd->options & OPTION_BIN_LOG) || (!(thd->security_ctx->master_access & SUPER_ACL)); #endif thr_lock_type lock_type; Item *unused_conds= 0; DBUG_ENTER("mysql_insert"); /* Upgrade lock type if the requested lock is incompatible with the current connection mode or table operation. */ upgrade_lock_type(thd, &table_list->lock_type, duplic, values_list.elements > 1); /* We can't write-delayed into a table locked with LOCK TABLES: this will lead to a deadlock, since the delayed thread will never be able to get a lock on the table. QQQ: why not upgrade the lock here instead? */ if (table_list->lock_type == TL_WRITE_DELAYED && thd->locked_tables && find_locked_table(thd, table_list->db, table_list->table_name)) { my_error(ER_DELAYED_INSERT_TABLE_LOCKED, MYF(0), table_list->table_name); DBUG_RETURN(TRUE); } if (table_list->lock_type == TL_WRITE_DELAYED) { if (open_and_lock_for_insert_delayed(thd, table_list)) DBUG_RETURN(TRUE); } else { if (open_and_lock_tables(thd, table_list)) DBUG_RETURN(TRUE); } lock_type= table_list->lock_type; thd_proc_info(thd, "init"); thd->used_tables=0; values= its++; value_count= values->elements; if (mysql_prepare_insert(thd, table_list, table, fields, values, update_fields, update_values, duplic, &unused_conds, FALSE, (fields.elements || !value_count || table_list->view != 0), !ignore && (thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES)))) goto abort; /* mysql_prepare_insert set table_list->table if it was not set */ table= table_list->table; context= &thd->lex->select_lex.context; /* These three asserts test the hypothesis that the resetting of the name resolution context below is not necessary at all since the list of local tables for INSERT always consists of one table. */ DBUG_ASSERT(!table_list->next_local); DBUG_ASSERT(!context->table_list->next_local); DBUG_ASSERT(!context->first_name_resolution_table->next_name_resolution_table); /* Save the state of the current name resolution context. */ ctx_state.save_state(context, table_list); /* Perform name resolution only in the first table - 'table_list', which is the table that is inserted into. */ table_list->next_local= 0; context->resolve_in_table_list_only(table_list); while ((values= its++)) { counter++; if (values->elements != value_count) { my_error(ER_WRONG_VALUE_COUNT_ON_ROW, MYF(0), counter); goto abort; } if (setup_fields(thd, 0, *values, 0, 0, 0)) goto abort; } its.rewind (); /* Restore the current context. */ ctx_state.restore_state(context, table_list); /* Fill in the given fields and dump it to the table file */ info.records= info.deleted= info.copied= info.updated= info.touched= 0; info.ignore= ignore; info.handle_duplicates=duplic; info.update_fields= &update_fields; info.update_values= &update_values; info.view= (table_list->view ? table_list : 0); /* Count warnings for all inserts. For single line insert, generate an error if try to set a NOT NULL field to NULL. */ thd->count_cuted_fields= ((values_list.elements == 1 && !ignore) ? CHECK_FIELD_ERROR_FOR_NULL : CHECK_FIELD_WARN); thd->cuted_fields = 0L; table->next_number_field=table->found_next_number_field; #ifdef HAVE_REPLICATION if (thd->slave_thread && (info.handle_duplicates == DUP_UPDATE) && (table->next_number_field != NULL) && rpl_master_has_bug(&active_mi->rli, 24432)) goto abort; #endif error=0; id=0; thd_proc_info(thd, "update"); if (duplic != DUP_ERROR || ignore) table->file->extra(HA_EXTRA_IGNORE_DUP_KEY); if (duplic == DUP_REPLACE) { if (!table->triggers || !table->triggers->has_delete_triggers()) table->file->extra(HA_EXTRA_WRITE_CAN_REPLACE); /* REPLACE should change values of all columns so we should mark all columns as columns to be set. As nice side effect we will retrieve columns which values are needed for ON DELETE triggers. */ table->file->extra(HA_EXTRA_RETRIEVE_ALL_COLS); } if (duplic == DUP_UPDATE) table->file->extra(HA_EXTRA_INSERT_WITH_UPDATE); /* let's *try* to start bulk inserts. It won't necessary start them as values_list.elements should be greater than some - handler dependent - threshold. We should not start bulk inserts if this statement uses functions or invokes triggers since they may access to the same table and therefore should not see its inconsistent state created by this optimization. So we call start_bulk_insert to perform nesessary checks on values_list.elements, and - if nothing else - to initialize the code to make the call of end_bulk_insert() below safe. */ #ifndef EMBEDDED_LIBRARY if (lock_type != TL_WRITE_DELAYED) #endif /* EMBEDDED_LIBRARY */ { if (duplic != DUP_ERROR || ignore) table->file->extra(HA_EXTRA_IGNORE_DUP_KEY); if (!thd->prelocked_mode) table->file->start_bulk_insert(values_list.elements); } thd->abort_on_warning= (!ignore && (thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES))); prepare_triggers_for_insert_stmt(thd, table, duplic); if (table_list->prepare_where(thd, 0, TRUE) || table_list->prepare_check_option(thd)) error= 1; while ((values= its++)) { if (fields.elements || !value_count) { restore_record(table,s->default_values); // Get empty record if (fill_record_n_invoke_before_triggers(thd, fields, *values, 0, table->triggers, TRG_EVENT_INSERT)) { if (values_list.elements != 1 && !thd->net.report_error) { info.records++; continue; } /* TODO: set thd->abort_on_warning if values_list.elements == 1 and check that all items return warning in case of problem with storing field. */ error=1; break; } } else { if (thd->used_tables) // Column used in values() restore_record(table,s->default_values); // Get empty record else { /* Fix delete marker. No need to restore rest of record since it will be overwritten by fill_record() anyway (and fill_record() does not use default values in this case). */ table->record[0][0]= table->s->default_values[0]; } if (fill_record_n_invoke_before_triggers(thd, table->field, *values, 0, table->triggers, TRG_EVENT_INSERT)) { if (values_list.elements != 1 && ! thd->net.report_error) { info.records++; continue; } error=1; break; } } if ((res= table_list->view_check_option(thd, (values_list.elements == 1 ? 0 : ignore))) == VIEW_CHECK_SKIP) continue; else if (res == VIEW_CHECK_ERROR) { error= 1; break; } #ifndef EMBEDDED_LIBRARY if (lock_type == TL_WRITE_DELAYED) { error=write_delayed(thd, table, duplic, ignore, query, thd->query_length, log_on); query=0; } else #endif error=write_record(thd, table ,&info); /* If auto_increment values are used, save the first one for LAST_INSERT_ID() and for the update log. */ if (! id && thd->insert_id_used) { // Get auto increment value id= thd->last_insert_id; } if (error) break; thd->row_count++; } free_underlaid_joins(thd, &thd->lex->select_lex); joins_freed= TRUE; /* Now all rows are inserted. Time to update logs and sends response to user */ #ifndef EMBEDDED_LIBRARY if (lock_type == TL_WRITE_DELAYED) { if (!error) { id=0; // No auto_increment id info.copied=values_list.elements; end_delayed_insert(thd); } query_cache_invalidate3(thd, table_list, 1); } else #endif { if (!thd->prelocked_mode && table->file->end_bulk_insert() && !error) { table->file->print_error(my_errno,MYF(0)); error=1; } if (id && values_list.elements != 1) thd->insert_id(id); // For update log else if (table->next_number_field && info.copied) id=table->next_number_field->val_int(); // Return auto_increment value if (duplic != DUP_ERROR || ignore) table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY); transactional_table= table->file->has_transactions(); if ((changed= (info.copied || info.deleted || info.updated))) { /* Invalidate the table in the query cache if something changed. For the transactional algorithm to work the invalidation must be before binlog writing and ha_autocommit_or_rollback */ if (changed) query_cache_invalidate3(thd, table_list, 1); } if (changed && error <= 0 || thd->transaction.stmt.modified_non_trans_table || was_insert_delayed) { if (mysql_bin_log.is_open()) { if (error <= 0) { /* [Guilhem wrote] Temporary errors may have filled thd->net.last_error/errno. For example if there has been a disk full error when writing the row, and it was MyISAM, then thd->net.last_error/errno will be set to "disk full"... and the my_pwrite() will wait until free space appears, and so when it finishes then the write_row() was entirely successful */ /* todo: consider removing */ thd->clear_error(); } /* bug#22725: A query which per-row-loop can not be interrupted with KILLED, like INSERT, and that does not invoke stored routines can be binlogged with neglecting the KILLED error. If there was no error (error == zero) until after the end of inserting loop the KILLED flag that appeared later can be disregarded since previously possible invocation of stored routines did not result in any error due to the KILLED. In such case the flag is ignored for constructing binlog event. */ Query_log_event qinfo(thd, thd->query, thd->query_length, transactional_table, FALSE, (error>0) ? thd->killed : THD::NOT_KILLED); DBUG_ASSERT(thd->killed != THD::KILL_BAD_DATA || error > 0); if (mysql_bin_log.write(&qinfo) && transactional_table) error=1; } if (thd->transaction.stmt.modified_non_trans_table) thd->transaction.all.modified_non_trans_table= TRUE; } DBUG_ASSERT(transactional_table || !changed || thd->transaction.stmt.modified_non_trans_table); if (transactional_table) error=ha_autocommit_or_rollback(thd,error); if (thd->lock) { mysql_unlock_tables(thd, thd->lock); /* Invalidate the table in the query cache if something changed after unlocking when changes become fisible. TODO: this is workaround. right way will be move invalidating in the unlock procedure. */ if (lock_type == TL_WRITE_CONCURRENT_INSERT && changed) { query_cache_invalidate3(thd, table_list, 1); } thd->lock=0; } } thd_proc_info(thd, "end"); table->next_number_field=0; thd->count_cuted_fields= CHECK_FIELD_IGNORE; thd->next_insert_id=0; // Reset this if wrongly used table->auto_increment_field_not_null= FALSE; if (duplic == DUP_REPLACE && (!table->triggers || !table->triggers->has_delete_triggers())) table->file->extra(HA_EXTRA_WRITE_CANNOT_REPLACE); /* Reset value of LAST_INSERT_ID if no rows were inserted or touched */ if (!info.copied && !info.touched && thd->insert_id_used) { thd->insert_id(0); id=0; } if (error) goto abort; if (values_list.elements == 1 && (!(thd->options & OPTION_WARNINGS) || !thd->cuted_fields)) { thd->row_count_func= info.copied + info.deleted + ((thd->client_capabilities & CLIENT_FOUND_ROWS) ? info.touched : info.updated); send_ok(thd, (ulong) thd->row_count_func, id); } else { char buff[160]; ha_rows updated=((thd->client_capabilities & CLIENT_FOUND_ROWS) ? info.touched : info.updated); if (ignore) sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records, (lock_type == TL_WRITE_DELAYED) ? (ulong) 0 : (ulong) (info.records - info.copied), (ulong) thd->cuted_fields); else sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records, (ulong) (info.deleted + updated), (ulong) thd->cuted_fields); thd->row_count_func= info.copied + info.deleted + updated; ::send_ok(thd, (ulong) thd->row_count_func, id, buff); } thd->abort_on_warning= 0; DBUG_RETURN(FALSE); abort: #ifndef EMBEDDED_LIBRARY if (lock_type == TL_WRITE_DELAYED) end_delayed_insert(thd); #endif if (!joins_freed) free_underlaid_joins(thd, &thd->lex->select_lex); thd->abort_on_warning= 0; DBUG_RETURN(TRUE); } /* Additional check for insertability for VIEW SYNOPSIS check_view_insertability() thd - thread handler view - reference on VIEW IMPLEMENTATION A view is insertable if the folloings are true: - All columns in the view are columns from a table - All not used columns in table have a default values - All field in view are unique (not referring to the same column) RETURN FALSE - OK view->contain_auto_increment is 1 if and only if the view contains an auto_increment field TRUE - can't be used for insert */ static bool check_view_insertability(THD * thd, TABLE_LIST *view) { uint num= view->view->select_lex.item_list.elements; TABLE *table= view->table; Field_translator *trans_start= view->field_translation, *trans_end= trans_start + num; Field_translator *trans; uint used_fields_buff_size= (table->s->fields + 7) / 8; uchar *used_fields_buff= (uchar*)thd->alloc(used_fields_buff_size); MY_BITMAP used_fields; bool save_set_query_id= thd->set_query_id; DBUG_ENTER("check_key_in_view"); if (!used_fields_buff) DBUG_RETURN(TRUE); // EOM DBUG_ASSERT(view->table != 0 && view->field_translation != 0); VOID(bitmap_init(&used_fields, used_fields_buff, used_fields_buff_size * 8, 0)); bitmap_clear_all(&used_fields); view->contain_auto_increment= 0; /* we must not set query_id for fields as they're not really used in this context */ thd->set_query_id= 0; /* check simplicity and prepare unique test of view */ for (trans= trans_start; trans != trans_end; trans++) { if (!trans->item->fixed && trans->item->fix_fields(thd, &trans->item)) { thd->set_query_id= save_set_query_id; DBUG_RETURN(TRUE); } Item_field *field; /* simple SELECT list entry (field without expression) */ if (!(field= trans->item->filed_for_view_update())) { thd->set_query_id= save_set_query_id; DBUG_RETURN(TRUE); } if (field->field->unireg_check == Field::NEXT_NUMBER) view->contain_auto_increment= 1; /* prepare unique test */ /* remove collation (or other transparent for update function) if we have it */ trans->item= field; } thd->set_query_id= save_set_query_id; /* unique test */ for (trans= trans_start; trans != trans_end; trans++) { /* Thanks to test above, we know that all columns are of type Item_field */ Item_field *field= (Item_field *)trans->item; /* check fields belong to table in which we are inserting */ if (field->field->table == table && bitmap_fast_test_and_set(&used_fields, field->field->field_index)) DBUG_RETURN(TRUE); } DBUG_RETURN(FALSE); } /* Check if table can be updated SYNOPSIS mysql_prepare_insert_check_table() thd Thread handle table_list Table list fields List of fields to be updated where Pointer to where clause select_insert Check is making for SELECT ... INSERT RETURN FALSE ok TRUE ERROR */ static bool mysql_prepare_insert_check_table(THD *thd, TABLE_LIST *table_list, List &fields, COND **where, bool select_insert) { bool insert_into_view= (table_list->view != 0); DBUG_ENTER("mysql_prepare_insert_check_table"); /* first table in list is the one we'll INSERT into, requires INSERT_ACL. all others require SELECT_ACL only. the ACL requirement below is for new leaves only anyway (view-constituents), so check for SELECT rather than INSERT. */ if (setup_tables_and_check_access(thd, &thd->lex->select_lex.context, &thd->lex->select_lex.top_join_list, table_list, where, &thd->lex->select_lex.leaf_tables, select_insert, INSERT_ACL, SELECT_ACL)) DBUG_RETURN(TRUE); if (insert_into_view && !fields.elements) { thd->lex->empty_field_list_on_rset= 1; if (!table_list->table) { my_error(ER_VIEW_NO_INSERT_FIELD_LIST, MYF(0), table_list->view_db.str, table_list->view_name.str); DBUG_RETURN(TRUE); } DBUG_RETURN(insert_view_fields(thd, &fields, table_list)); } DBUG_RETURN(FALSE); } /* Prepare items in INSERT statement SYNOPSIS mysql_prepare_insert() thd Thread handler table_list Global/local table list table Table to insert into (can be NULL if table should be taken from table_list->table) where Where clause (for insert ... select) select_insert TRUE if INSERT ... SELECT statement check_fields TRUE if need to check that all INSERT fields are given values. abort_on_warning whether to report if some INSERT field is not assigned as an error (TRUE) or as a warning (FALSE). TODO (in far future) In cases of: INSERT INTO t1 SELECT a, sum(a) as sum1 from t2 GROUP BY a ON DUPLICATE KEY ... we should be able to refer to sum1 in the ON DUPLICATE KEY part WARNING You MUST set table->insert_values to 0 after calling this function before releasing the table object. RETURN VALUE FALSE OK TRUE error */ bool mysql_prepare_insert(THD *thd, TABLE_LIST *table_list, TABLE *table, List &fields, List_item *values, List &update_fields, List &update_values, enum_duplicates duplic, COND **where, bool select_insert, bool check_fields, bool abort_on_warning) { SELECT_LEX *select_lex= &thd->lex->select_lex; Name_resolution_context *context= &select_lex->context; Name_resolution_context_state ctx_state; bool insert_into_view= (table_list->view != 0); bool res= 0; table_map map= 0; DBUG_ENTER("mysql_prepare_insert"); DBUG_PRINT("enter", ("table_list 0x%lx, table 0x%lx, view %d", (ulong)table_list, (ulong)table, (int)insert_into_view)); /* INSERT should have a SELECT or VALUES clause */ DBUG_ASSERT (!select_insert || !values); /* For subqueries in VALUES() we should not see the table in which we are inserting (for INSERT ... SELECT this is done by changing table_list, because INSERT ... SELECT share SELECT_LEX it with SELECT. */ if (!select_insert) { for (SELECT_LEX_UNIT *un= select_lex->first_inner_unit(); un; un= un->next_unit()) { for (SELECT_LEX *sl= un->first_select(); sl; sl= sl->next_select()) { sl->context.outer_context= 0; } } } if (duplic == DUP_UPDATE) { /* it should be allocated before Item::fix_fields() */ if (table_list->set_insert_values(thd->mem_root)) DBUG_RETURN(TRUE); } if (mysql_prepare_insert_check_table(thd, table_list, fields, where, select_insert)) DBUG_RETURN(TRUE); /* Prepare the fields in the statement. */ if (values) { /* if we have INSERT ... VALUES () we cannot have a GROUP BY clause */ DBUG_ASSERT (!select_lex->group_list.elements); /* Save the state of the current name resolution context. */ ctx_state.save_state(context, table_list); /* Perform name resolution only in the first table - 'table_list', which is the table that is inserted into. */ table_list->next_local= 0; context->resolve_in_table_list_only(table_list); res= check_insert_fields(thd, context->table_list, fields, *values, !insert_into_view, &map) || setup_fields(thd, 0, *values, 0, 0, 0); if (!res && check_fields) { bool saved_abort_on_warning= thd->abort_on_warning; thd->abort_on_warning= abort_on_warning; res= check_that_all_fields_are_given_values(thd, table ? table : context->table_list->table, context->table_list); thd->abort_on_warning= saved_abort_on_warning; } if (!res && duplic == DUP_UPDATE) { select_lex->no_wrap_view_item= TRUE; res= check_update_fields(thd, context->table_list, update_fields, &map); select_lex->no_wrap_view_item= FALSE; } /* Restore the current context. */ ctx_state.restore_state(context, table_list); if (!res) res= setup_fields(thd, 0, update_values, 1, 0, 0); } if (res) DBUG_RETURN(res); if (!table) table= table_list->table; if (!select_insert) { Item *fake_conds= 0; TABLE_LIST *duplicate; if ((duplicate= unique_table(thd, table_list, table_list->next_global, 1))) { update_non_unique_table_error(table_list, "INSERT", duplicate); DBUG_RETURN(TRUE); } select_lex->fix_prepare_information(thd, &fake_conds, &fake_conds); select_lex->first_execution= 0; } /* Only call extra() handler method if we are not performing a DELAYED operation. It will instead be executed by delayed insert thread. */ if ((duplic == DUP_UPDATE || duplic == DUP_REPLACE) && (table->reginfo.lock_type != TL_WRITE_DELAYED)) table->file->extra(HA_EXTRA_RETRIEVE_PRIMARY_KEY); DBUG_RETURN(FALSE); } /* Check if there is more uniq keys after field */ static int last_uniq_key(TABLE *table,uint keynr) { while (++keynr < table->s->keys) if (table->key_info[keynr].flags & HA_NOSAME) return 0; return 1; } /* Write a record to table with optional deleting of conflicting records, invoke proper triggers if needed. SYNOPSIS write_record() thd - thread context table - table to which record should be written info - COPY_INFO structure describing handling of duplicates and which is used for counting number of records inserted and deleted. NOTE Once this record will be written to table after insert trigger will be invoked. If instead of inserting new record we will update old one then both on update triggers will work instead. Similarly both on delete triggers will be invoked if we will delete conflicting records. Sets thd->transaction.stmt.modified_non_trans_table to TRUE if table which is updated didn't have transactions. RETURN VALUE 0 - success non-0 - error */ int write_record(THD *thd, TABLE *table,COPY_INFO *info) { int error, trg_error= 0; char *key=0; DBUG_ENTER("write_record"); info->records++; if (info->handle_duplicates == DUP_REPLACE || info->handle_duplicates == DUP_UPDATE) { while ((error=table->file->write_row(table->record[0]))) { uint key_nr; if (error != HA_WRITE_SKIP) goto err; if ((int) (key_nr = table->file->get_dup_key(error)) < 0) { error=HA_WRITE_SKIP; /* Database can't find key */ goto err; } /* Don't allow REPLACE to replace a row when a auto_increment column was used. This ensures that we don't get a problem when the whole range of the key has been used. */ if (info->handle_duplicates == DUP_REPLACE && table->next_number_field && key_nr == table->s->next_number_index && table->file->auto_increment_column_changed) goto err; if (table->file->table_flags() & HA_DUPP_POS) { if (table->file->rnd_pos(table->record[1],table->file->dupp_ref)) goto err; } else { if (table->file->extra(HA_EXTRA_FLUSH_CACHE)) /* Not needed with NISAM */ { error=my_errno; goto err; } if (!key) { if (!(key=(char*) my_safe_alloca(table->s->max_unique_length, MAX_KEY_LENGTH))) { error=ENOMEM; goto err; } } key_copy((byte*) key,table->record[0],table->key_info+key_nr,0); if ((error=(table->file->index_read_idx(table->record[1],key_nr, (byte*) key, table->key_info[key_nr]. key_length, HA_READ_KEY_EXACT)))) goto err; } if (info->handle_duplicates == DUP_UPDATE) { int res= 0; /* We don't check for other UNIQUE keys - the first row that matches, is updated. If update causes a conflict again, an error is returned */ DBUG_ASSERT(table->insert_values != NULL); store_record(table,insert_values); restore_record(table,record[1]); DBUG_ASSERT(info->update_fields->elements == info->update_values->elements); if (fill_record_n_invoke_before_triggers(thd, *info->update_fields, *info->update_values, info->ignore, table->triggers, TRG_EVENT_UPDATE)) goto before_trg_err; /* CHECK OPTION for VIEW ... ON DUPLICATE KEY UPDATE ... */ if (info->view && (res= info->view->view_check_option(current_thd, info->ignore)) == VIEW_CHECK_SKIP) goto ok_or_after_trg_err; if (res == VIEW_CHECK_ERROR) goto before_trg_err; table->file->restore_auto_increment(); if ((table->file->table_flags() & HA_PARTIAL_COLUMN_READ) || compare_record(table, thd->query_id)) { if ((error=table->file->update_row(table->record[1],table->record[0]))) { if ((error == HA_ERR_FOUND_DUPP_KEY) && info->ignore) { goto ok_or_after_trg_err; } goto err; } info->updated++; trg_error= (table->triggers && table->triggers->process_triggers(thd, TRG_EVENT_UPDATE, TRG_ACTION_AFTER, TRUE)); info->copied++; } if (table->next_number_field) table->file->adjust_next_insert_id_after_explicit_value( table->next_number_field->val_int()); info->touched++; goto ok_or_after_trg_err; } else /* DUP_REPLACE */ { /* The manual defines the REPLACE semantics that it is either an INSERT or DELETE(s) + INSERT; FOREIGN KEY checks in InnoDB do not function in the defined way if we allow MySQL to convert the latter operation internally to an UPDATE. We also should not perform this conversion if we have timestamp field with ON UPDATE which is different from DEFAULT. Another case when conversion should not be performed is when we have ON DELETE trigger on table so user may notice that we cheat here. Note that it is ok to do such conversion for tables which have ON UPDATE but have no ON DELETE triggers, we just should not expose this fact to users by invoking ON UPDATE triggers. */ if (last_uniq_key(table,key_nr) && !table->file->referenced_by_foreign_key() && (table->timestamp_field_type == TIMESTAMP_NO_AUTO_SET || table->timestamp_field_type == TIMESTAMP_AUTO_SET_ON_BOTH) && (!table->triggers || !table->triggers->has_delete_triggers())) { if ((error=table->file->update_row(table->record[1], table->record[0]))) goto err; info->deleted++; /* Since we pretend that we have done insert we should call its after triggers. */ goto after_trg_n_copied_inc; } else { if (table->triggers && table->triggers->process_triggers(thd, TRG_EVENT_DELETE, TRG_ACTION_BEFORE, TRUE)) goto before_trg_err; if ((error=table->file->delete_row(table->record[1]))) goto err; info->deleted++; if (!table->file->has_transactions()) thd->transaction.stmt.modified_non_trans_table= TRUE; if (table->triggers && table->triggers->process_triggers(thd, TRG_EVENT_DELETE, TRG_ACTION_AFTER, TRUE)) { trg_error= 1; goto ok_or_after_trg_err; } /* Let us attempt do write_row() once more */ } } } } else if ((error=table->file->write_row(table->record[0]))) { if (!info->ignore || (error != HA_ERR_FOUND_DUPP_KEY && error != HA_ERR_FOUND_DUPP_UNIQUE)) goto err; table->file->restore_auto_increment(); goto ok_or_after_trg_err; } after_trg_n_copied_inc: info->copied++; trg_error= (table->triggers && table->triggers->process_triggers(thd, TRG_EVENT_INSERT, TRG_ACTION_AFTER, TRUE)); ok_or_after_trg_err: if (key) my_safe_afree(key,table->s->max_unique_length,MAX_KEY_LENGTH); if (!table->file->has_transactions()) thd->transaction.stmt.modified_non_trans_table= TRUE; DBUG_RETURN(trg_error); err: info->last_errno= error; /* current_select is NULL if this is a delayed insert */ if (thd->lex->current_select) thd->lex->current_select->no_error= 0; // Give error table->file->print_error(error,MYF(0)); before_trg_err: table->file->restore_auto_increment(); if (key) my_safe_afree(key, table->s->max_unique_length, MAX_KEY_LENGTH); DBUG_RETURN(1); } /****************************************************************************** Check that all fields with arn't null_fields are used ******************************************************************************/ int check_that_all_fields_are_given_values(THD *thd, TABLE *entry, TABLE_LIST *table_list) { int err= 0; for (Field **field=entry->field ; *field ; field++) { if ((*field)->query_id != thd->query_id && ((*field)->flags & NO_DEFAULT_VALUE_FLAG) && ((*field)->real_type() != FIELD_TYPE_ENUM)) { bool view= FALSE; if (table_list) { table_list= table_list->top_table(); view= test(table_list->view); } if (view) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_NO_DEFAULT_FOR_VIEW_FIELD, ER(ER_NO_DEFAULT_FOR_VIEW_FIELD), table_list->view_db.str, table_list->view_name.str); } else { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_NO_DEFAULT_FOR_FIELD, ER(ER_NO_DEFAULT_FOR_FIELD), (*field)->field_name); } err= 1; } } return thd->abort_on_warning ? err : 0; } /***************************************************************************** Handling of delayed inserts A thread is created for each table that one uses with the DELAYED attribute. *****************************************************************************/ #ifndef EMBEDDED_LIBRARY class delayed_row :public ilink { public: char *record,*query; enum_duplicates dup; time_t start_time; bool query_start_used,last_insert_id_used,insert_id_used, ignore, log_query; ulonglong last_insert_id; ulonglong next_insert_id; ulong auto_increment_increment; ulong auto_increment_offset; timestamp_auto_set_type timestamp_field_type; Time_zone *time_zone; uint query_length; delayed_row(enum_duplicates dup_arg, bool ignore_arg, bool log_query_arg) :record(0), query(0), dup(dup_arg), ignore(ignore_arg), log_query(log_query_arg), time_zone(0) {} ~delayed_row() { x_free(record); } }; /** Delayed_insert - context of a thread responsible for delayed insert into one table. When processing delayed inserts, we create an own thread for every distinct table. Later on all delayed inserts directed into that table are handled by a dedicated thread. */ class Delayed_insert :public ilink { uint locks_in_memory; public: THD thd; TABLE *table; pthread_mutex_t mutex; pthread_cond_t cond,cond_client; volatile uint tables_in_use,stacked_inserts; volatile bool status,dead; COPY_INFO info; I_List rows; ulong group_count; TABLE_LIST table_list; // Argument Delayed_insert() :locks_in_memory(0), table(0),tables_in_use(0),stacked_inserts(0), status(0), dead(0), group_count(0) { thd.security_ctx->user=thd.security_ctx->priv_user=(char*) delayed_user; thd.security_ctx->host=(char*) my_localhost; thd.current_tablenr=0; thd.version=refresh_version; thd.command=COM_DELAYED_INSERT; thd.lex->current_select= 0; // for my_message_sql thd.lex->sql_command= SQLCOM_INSERT; // For innodb::store_lock() bzero((char*) &thd.net, sizeof(thd.net)); // Safety bzero((char*) &table_list, sizeof(table_list)); // Safety thd.system_thread= SYSTEM_THREAD_DELAYED_INSERT; thd.security_ctx->host_or_ip= ""; bzero((char*) &info,sizeof(info)); pthread_mutex_init(&mutex,MY_MUTEX_INIT_FAST); pthread_cond_init(&cond,NULL); pthread_cond_init(&cond_client,NULL); VOID(pthread_mutex_lock(&LOCK_thread_count)); delayed_insert_threads++; VOID(pthread_mutex_unlock(&LOCK_thread_count)); } ~Delayed_insert() { /* The following is not really needed, but just for safety */ delayed_row *row; while ((row=rows.get())) delete row; if (table) close_thread_tables(&thd); VOID(pthread_mutex_lock(&LOCK_thread_count)); pthread_mutex_destroy(&mutex); pthread_cond_destroy(&cond); pthread_cond_destroy(&cond_client); thd.unlink(); // Must be unlinked under lock x_free(thd.query); thd.security_ctx->user= thd.security_ctx->host=0; thread_count--; delayed_insert_threads--; VOID(pthread_mutex_unlock(&LOCK_thread_count)); VOID(pthread_cond_broadcast(&COND_thread_count)); /* Tell main we are ready */ } /* The following is for checking when we can delete ourselves */ inline void lock() { locks_in_memory++; // Assume LOCK_delay_insert } void unlock() { pthread_mutex_lock(&LOCK_delayed_insert); if (!--locks_in_memory) { pthread_mutex_lock(&mutex); if (thd.killed && ! stacked_inserts && ! tables_in_use) { pthread_cond_signal(&cond); status=1; } pthread_mutex_unlock(&mutex); } pthread_mutex_unlock(&LOCK_delayed_insert); } inline uint lock_count() { return locks_in_memory; } TABLE* get_local_table(THD* client_thd); bool handle_inserts(void); }; I_List delayed_threads; /** Return an instance of delayed insert thread that can handle inserts into a given table, if it exists. Otherwise return NULL. */ static Delayed_insert *find_handler(THD *thd, TABLE_LIST *table_list) { thd_proc_info(thd, "waiting for delay_list"); pthread_mutex_lock(&LOCK_delayed_insert); // Protect master list I_List_iterator it(delayed_threads); Delayed_insert *di; while ((di= it++)) { if (!strcmp(table_list->db, di->table_list.db) && !strcmp(table_list->table_name, di->table_list.table_name)) { di->lock(); break; } } pthread_mutex_unlock(&LOCK_delayed_insert); // For unlink from list return di; } /** Attempt to find or create a delayed insert thread to handle inserts into this table. @return In case of success, table_list->table points to a local copy of the delayed table or is set to NULL, which indicates a request for lock upgrade. In case of failure, value of table_list->table is undefined. @retval TRUE - this thread ran out of resources OR - a newly created delayed insert thread ran out of resources OR - the created thread failed to open and lock the table (e.g. because it does not exist) OR - the table opened in the created thread turned out to be a view @retval FALSE - table successfully opened OR - too many delayed insert threads OR - the table has triggers and we have to fall back to a normal INSERT Two latter cases indicate a request for lock upgrade. XXX: why do we regard INSERT DELAYED into a view as an error and do not simply perform a lock upgrade? TODO: The approach with using two mutexes to work with the delayed thread list -- LOCK_delayed_insert and LOCK_delayed_create -- is redundant, and we only need one of them to protect the list. The reason we have two locks is that we do not want to block look-ups in the list while we're waiting for the newly created thread to open the delayed table. However, this wait itself is redundant -- we always call get_local_table later on, and there wait again until the created thread acquires a table lock. As is redundant the concept of locks_in_memory, since we already have another counter with similar semantics - tables_in_use, both of them are devoted to counting the number of producers for a given consumer (delayed insert thread), only at different stages of producer-consumer relationship. 'dead' and 'status' variables in Delayed_insert are redundant too, since there is already 'di->thd.killed' and di->stacked_inserts. */ static bool delayed_get_table(THD *thd, TABLE_LIST *table_list) { int error; Delayed_insert *di; DBUG_ENTER("delayed_get_table"); /* Must be set in the parser */ DBUG_ASSERT(table_list->db); /* Find the thread which handles this table. */ if (!(di= find_handler(thd, table_list))) { /* No match. Create a new thread to handle the table, but no more than max_insert_delayed_threads. */ if (delayed_insert_threads >= thd->variables.max_insert_delayed_threads) DBUG_RETURN(0); thd_proc_info(thd, "Creating delayed handler"); pthread_mutex_lock(&LOCK_delayed_create); /* The first search above was done without LOCK_delayed_create. Another thread might have created the handler in between. Search again. */ if (! (di= find_handler(thd, table_list))) { if (!(di= new Delayed_insert())) { my_error(ER_OUTOFMEMORY,MYF(0),sizeof(Delayed_insert)); thd->fatal_error(); goto end_create; } pthread_mutex_lock(&LOCK_thread_count); thread_count++; pthread_mutex_unlock(&LOCK_thread_count); di->thd.set_db(table_list->db, (uint) strlen(table_list->db)); di->thd.query= my_strdup(table_list->table_name, MYF(MY_WME)); if (di->thd.db == NULL || di->thd.query == NULL) { /* The error is reported */ delete di; thd->fatal_error(); goto end_create; } di->table_list= *table_list; // Needed to open table /* Replace volatile strings with local copies */ di->table_list.alias= di->table_list.table_name= di->thd.query; di->table_list.db= di->thd.db; di->lock(); pthread_mutex_lock(&di->mutex); if ((error= pthread_create(&di->thd.real_id, &connection_attrib, handle_delayed_insert, (void*) di))) { DBUG_PRINT("error", ("Can't create thread to handle delayed insert (error %d)", error)); pthread_mutex_unlock(&di->mutex); di->unlock(); delete di; my_error(ER_CANT_CREATE_THREAD, MYF(0), error); thd->fatal_error(); goto end_create; } /* Wait until table is open */ thd_proc_info(thd, "waiting for handler open"); while (!di->thd.killed && !di->table && !thd->killed) { pthread_cond_wait(&di->cond_client, &di->mutex); } pthread_mutex_unlock(&di->mutex); thd_proc_info(thd, "got old table"); if (di->thd.killed) { if (di->thd.net.report_error) { /* Copy the error message. Note that we don't treat fatal errors in the delayed thread as fatal errors in the main thread. Use of my_message will enable stored procedures continue handlers. */ my_message(di->thd.net.last_errno, di->thd.net.last_error, MYF(0)); } di->unlock(); goto end_create; } if (thd->killed) { di->unlock(); goto end_create; } pthread_mutex_lock(&LOCK_delayed_insert); delayed_threads.append(di); pthread_mutex_unlock(&LOCK_delayed_insert); } pthread_mutex_unlock(&LOCK_delayed_create); } pthread_mutex_lock(&di->mutex); table_list->table= di->get_local_table(thd); pthread_mutex_unlock(&di->mutex); if (table_list->table) { DBUG_ASSERT(thd->net.report_error == 0); thd->di= di; } /* Unlock the delayed insert object after its last access. */ di->unlock(); DBUG_RETURN(table_list->table == NULL); end_create: pthread_mutex_unlock(&LOCK_delayed_create); DBUG_RETURN(thd->net.report_error); } /** As we can't let many client threads modify the same TABLE structure of the dedicated delayed insert thread, we create an own structure for each client thread. This includes a row buffer to save the column values and new fields that point to the new row buffer. The memory is allocated in the client thread and is freed automatically. @pre This function is called from the client thread. Delayed insert thread mutex must be acquired before invoking this function. @return Not-NULL table object on success. NULL in case of an error, which is set in client_thd. */ TABLE *Delayed_insert::get_local_table(THD* client_thd) { my_ptrdiff_t adjust_ptrs; Field **field,**org_field, *found_next_number_field; TABLE *copy; DBUG_ENTER("Delayed_insert::get_local_table"); /* First request insert thread to get a lock */ status=1; tables_in_use++; if (!thd.lock) // Table is not locked { thd_proc_info(client_thd, "waiting for handler lock"); pthread_cond_signal(&cond); // Tell handler to lock table while (!dead && !thd.lock && ! client_thd->killed) { pthread_cond_wait(&cond_client,&mutex); } thd_proc_info(client_thd, "got handler lock"); if (client_thd->killed) goto error; if (dead) { my_message(thd.net.last_errno, thd.net.last_error, MYF(0)); goto error; } } /* Allocate memory for the TABLE object, the field pointers array, and one record buffer of reclength size. Normally a table has three record buffers of rec_buff_length size, which includes alignment bytes. Since the table copy is used for creating one record only, the other record buffers and alignment are unnecessary. */ thd_proc_info(client_thd, "allocating local table"); copy= (TABLE*) client_thd->alloc(sizeof(*copy)+ (table->s->fields+1)*sizeof(Field**)+ table->s->reclength); if (!copy) goto error; /* Copy the TABLE object. */ *copy= *table; copy->s= ©->share_not_to_be_used; // No name hashing bzero((char*) ©->s->name_hash,sizeof(copy->s->name_hash)); /* We don't need to change the file handler here */ /* Assign the pointers for the field pointers array and the record. */ field= copy->field= (Field**) (copy + 1); copy->record[0]= (byte*) (field + table->s->fields + 1); memcpy((char*) copy->record[0], (char*) table->record[0], table->s->reclength); /* Make a copy of all fields. The copied fields need to point into the copied record. This is done by copying the field objects with their old pointer values and then "move" the pointers by the distance between the original and copied records. That way we preserve the relative positions in the records. */ adjust_ptrs= PTR_BYTE_DIFF(copy->record[0], table->record[0]); found_next_number_field= table->found_next_number_field; for (org_field= table->field; *org_field; org_field++, field++) { if (!(*field= (*org_field)->new_field(client_thd->mem_root, copy, 1))) goto error; (*field)->orig_table= copy; // Remove connection (*field)->move_field(adjust_ptrs); // Point at copy->record[0] if (*org_field == found_next_number_field) (*field)->table->found_next_number_field= *field; } *field=0; /* Adjust timestamp */ if (table->timestamp_field) { /* Restore offset as this may have been reset in handle_inserts */ copy->timestamp_field= (Field_timestamp*) copy->field[table->s->timestamp_field_offset]; copy->timestamp_field->unireg_check= table->timestamp_field->unireg_check; copy->timestamp_field_type= copy->timestamp_field->get_auto_set_type(); } /* _rowid is not used with delayed insert */ copy->rowid_field=0; /* Adjust in_use for pointing to client thread */ copy->in_use= client_thd; /* Adjust lock_count. This table object is not part of a lock. */ copy->lock_count= 0; DBUG_RETURN(copy); /* Got fatal error */ error: tables_in_use--; status=1; pthread_cond_signal(&cond); // Inform thread about abort DBUG_RETURN(0); } /* Put a question in queue */ static int write_delayed(THD *thd,TABLE *table,enum_duplicates duplic, bool ignore, char *query, uint query_length, bool log_on) { delayed_row *row=0; Delayed_insert *di=thd->di; DBUG_ENTER("write_delayed"); thd_proc_info(thd, "waiting for handler insert"); pthread_mutex_lock(&di->mutex); while (di->stacked_inserts >= delayed_queue_size && !thd->killed) pthread_cond_wait(&di->cond_client,&di->mutex); thd_proc_info(thd, "storing row into queue"); if (thd->killed || !(row= new delayed_row(duplic, ignore, log_on))) goto err; if (!query) query_length=0; if (!(row->record= (char*) my_malloc(table->s->reclength+query_length+1, MYF(MY_WME)))) goto err; memcpy(row->record, table->record[0], table->s->reclength); if (query_length) { row->query= row->record+table->s->reclength; memcpy(row->query,query,query_length+1); } row->query_length= query_length; row->start_time= thd->start_time; row->query_start_used= thd->query_start_used; row->last_insert_id_used= thd->last_insert_id_used; row->insert_id_used= thd->insert_id_used; row->last_insert_id= thd->last_insert_id; row->timestamp_field_type= table->timestamp_field_type; /* Add session variable timezone Time_zone object will not be freed even the thread is ended. So we can get time_zone object from thread which handling delayed statement. See the comment of my_tz_find() for detail. */ if (thd->time_zone_used) { row->time_zone = thd->variables.time_zone; } else { row->time_zone = NULL; } /* The session variable settings can always be copied. */ row->auto_increment_increment= thd->variables.auto_increment_increment; row->auto_increment_offset= thd->variables.auto_increment_offset; /* Next insert id must be set for the first value in a multi-row insert only. So clear it after the first use. Assume a multi-row insert. Since the user thread doesn't really execute the insert, thd->next_insert_id is left untouched between the rows. If we copy the same insert id to every row of the multi-row insert, the delayed insert thread would copy this before inserting every row. Thus it tries to insert all rows with the same insert id. This fails on the unique constraint. So just the first row would be really inserted. */ row->next_insert_id= thd->next_insert_id; thd->next_insert_id= 0; di->rows.push_back(row); di->stacked_inserts++; di->status=1; if (table->s->blob_fields) unlink_blobs(table); pthread_cond_signal(&di->cond); thread_safe_increment(delayed_rows_in_use,&LOCK_delayed_status); pthread_mutex_unlock(&di->mutex); DBUG_RETURN(0); err: delete row; pthread_mutex_unlock(&di->mutex); DBUG_RETURN(1); } /** Signal the delayed insert thread that this user connection is finished using it for this statement. */ static void end_delayed_insert(THD *thd) { DBUG_ENTER("end_delayed_insert"); Delayed_insert *di=thd->di; pthread_mutex_lock(&di->mutex); DBUG_PRINT("info",("tables in use: %d",di->tables_in_use)); if (!--di->tables_in_use || di->thd.killed) { // Unlock table di->status=1; pthread_cond_signal(&di->cond); } pthread_mutex_unlock(&di->mutex); DBUG_VOID_RETURN; } /* We kill all delayed threads when doing flush-tables */ void kill_delayed_threads(void) { VOID(pthread_mutex_lock(&LOCK_delayed_insert)); // For unlink from list I_List_iterator it(delayed_threads); Delayed_insert *di; while ((di= it++)) { di->thd.killed= THD::KILL_CONNECTION; if (di->thd.mysys_var) { pthread_mutex_lock(&di->thd.mysys_var->mutex); if (di->thd.mysys_var->current_cond) { /* We need the following test because the main mutex may be locked in handle_delayed_insert() */ if (&di->mutex != di->thd.mysys_var->current_mutex) pthread_mutex_lock(di->thd.mysys_var->current_mutex); pthread_cond_broadcast(di->thd.mysys_var->current_cond); if (&di->mutex != di->thd.mysys_var->current_mutex) pthread_mutex_unlock(di->thd.mysys_var->current_mutex); } pthread_mutex_unlock(&di->thd.mysys_var->mutex); } } VOID(pthread_mutex_unlock(&LOCK_delayed_insert)); // For unlink from list } /* * Create a new delayed insert thread */ pthread_handler_t handle_delayed_insert(void *arg) { Delayed_insert *di=(Delayed_insert*) arg; THD *thd= &di->thd; pthread_detach_this_thread(); /* Add thread to THD list so that's it's visible in 'show processlist' */ pthread_mutex_lock(&LOCK_thread_count); thd->thread_id=thread_id++; thd->end_time(); threads.append(thd); thd->killed=abort_loop ? THD::KILL_CONNECTION : THD::NOT_KILLED; pthread_mutex_unlock(&LOCK_thread_count); /* Wait until the client runs into pthread_cond_wait(), where we free it after the table is opened and di linked in the list. If we did not wait here, the client might detect the opened table before it is linked to the list. It would release LOCK_delayed_create and allow another thread to create another handler for the same table, since it does not find one in the list. */ pthread_mutex_lock(&di->mutex); #if !defined( __WIN__) && !defined(OS2) /* Win32 calls this in pthread_create */ if (my_thread_init()) { strmov(thd->net.last_error,ER(thd->net.last_errno=ER_OUT_OF_RESOURCES)); goto end; } #endif DBUG_ENTER("handle_delayed_insert"); thd->thread_stack= (char*) &thd; if (init_thr_lock() || thd->store_globals()) { thd->fatal_error(); strmov(thd->net.last_error,ER(thd->net.last_errno=ER_OUT_OF_RESOURCES)); goto end; } #if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__) sigset_t set; VOID(sigemptyset(&set)); // Get mask in use VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals)); #endif /* open table */ if (!(di->table=open_ltable(thd,&di->table_list,TL_WRITE_DELAYED))) { thd->fatal_error(); // Abort waiting inserts goto end; } if (!(di->table->file->table_flags() & HA_CAN_INSERT_DELAYED)) { thd->fatal_error(); my_error(ER_ILLEGAL_HA, MYF(0), di->table_list.table_name); goto end; } if (di->table->triggers) { /* Table has triggers. This is not an error, but we do not support triggers with delayed insert. Terminate the delayed thread without an error and thus request lock upgrade. */ goto end; } di->table->copy_blobs=1; /* Tell client that the thread is initialized */ pthread_cond_signal(&di->cond_client); /* Now wait until we get an insert or lock to handle */ /* We will not abort as long as a client thread uses this thread */ for (;;) { if (thd->killed == THD::KILL_CONNECTION) { uint lock_count; /* Remove this from delay insert list so that no one can request a table from this */ pthread_mutex_unlock(&di->mutex); pthread_mutex_lock(&LOCK_delayed_insert); di->unlink(); lock_count=di->lock_count(); pthread_mutex_unlock(&LOCK_delayed_insert); pthread_mutex_lock(&di->mutex); if (!lock_count && !di->tables_in_use && !di->stacked_inserts) break; // Time to die } if (!di->status && !di->stacked_inserts) { struct timespec abstime; set_timespec(abstime, delayed_insert_timeout); /* Information for pthread_kill */ di->thd.mysys_var->current_mutex= &di->mutex; di->thd.mysys_var->current_cond= &di->cond; thd_proc_info(&(di->thd), "Waiting for INSERT"); DBUG_PRINT("info",("Waiting for someone to insert rows")); while (!thd->killed) { int error; #if defined(HAVE_BROKEN_COND_TIMEDWAIT) error=pthread_cond_wait(&di->cond,&di->mutex); #else error=pthread_cond_timedwait(&di->cond,&di->mutex,&abstime); #ifdef EXTRA_DEBUG if (error && error != EINTR && error != ETIMEDOUT) { fprintf(stderr, "Got error %d from pthread_cond_timedwait\n",error); DBUG_PRINT("error",("Got error %d from pthread_cond_timedwait", error)); } #endif #endif if (thd->killed || di->status) break; if (error == ETIMEDOUT || error == ETIME) { thd->killed= THD::KILL_CONNECTION; break; } } /* We can't lock di->mutex and mysys_var->mutex at the same time */ pthread_mutex_unlock(&di->mutex); pthread_mutex_lock(&di->thd.mysys_var->mutex); di->thd.mysys_var->current_mutex= 0; di->thd.mysys_var->current_cond= 0; pthread_mutex_unlock(&di->thd.mysys_var->mutex); pthread_mutex_lock(&di->mutex); } thd_proc_info(&(di->thd), 0); if (di->tables_in_use && ! thd->lock) { bool not_used; /* Request for new delayed insert. Lock the table, but avoid to be blocked by a global read lock. If we got here while a global read lock exists, then one or more inserts started before the lock was requested. These are allowed to complete their work before the server returns control to the client which requested the global read lock. The delayed insert handler will close the table and finish when the outstanding inserts are done. */ if (! (thd->lock= mysql_lock_tables(thd, &di->table, 1, MYSQL_LOCK_IGNORE_GLOBAL_READ_LOCK, ¬_used))) { /* Fatal error */ di->dead= 1; thd->killed= THD::KILL_CONNECTION; } pthread_cond_broadcast(&di->cond_client); } if (di->stacked_inserts) { if (di->handle_inserts()) { /* Some fatal error */ di->dead= 1; thd->killed= THD::KILL_CONNECTION; } } di->status=0; if (!di->stacked_inserts && !di->tables_in_use && thd->lock) { /* No one is doing a insert delayed Unlock table so that other threads can use it */ MYSQL_LOCK *lock=thd->lock; thd->lock=0; pthread_mutex_unlock(&di->mutex); mysql_unlock_tables(thd, lock); di->group_count=0; pthread_mutex_lock(&di->mutex); } if (di->tables_in_use) pthread_cond_broadcast(&di->cond_client); // If waiting clients } end: /* di should be unlinked from the thread handler list and have no active clients */ close_thread_tables(thd); // Free the table di->table=0; di->dead= 1; // If error thd->killed= THD::KILL_CONNECTION; // If error pthread_cond_broadcast(&di->cond_client); // Safety pthread_mutex_unlock(&di->mutex); pthread_mutex_lock(&LOCK_delayed_create); // Because of delayed_get_table pthread_mutex_lock(&LOCK_delayed_insert); delete di; pthread_mutex_unlock(&LOCK_delayed_insert); pthread_mutex_unlock(&LOCK_delayed_create); my_thread_end(); pthread_exit(0); DBUG_RETURN(0); } /* Remove pointers from temporary fields to allocated values */ static void unlink_blobs(register TABLE *table) { for (Field **ptr=table->field ; *ptr ; ptr++) { if ((*ptr)->flags & BLOB_FLAG) ((Field_blob *) (*ptr))->clear_temporary(); } } /* Free blobs stored in current row */ static void free_delayed_insert_blobs(register TABLE *table) { for (Field **ptr=table->field ; *ptr ; ptr++) { if ((*ptr)->flags & BLOB_FLAG) { char *str; ((Field_blob *) (*ptr))->get_ptr(&str); my_free(str,MYF(MY_ALLOW_ZERO_PTR)); ((Field_blob *) (*ptr))->reset(); } } } bool Delayed_insert::handle_inserts(void) { int error; ulong max_rows; bool using_ignore= 0, using_opt_replace= 0; bool using_bin_log= mysql_bin_log.is_open(); delayed_row *row; DBUG_ENTER("handle_inserts"); /* Allow client to insert new rows */ pthread_mutex_unlock(&mutex); table->next_number_field=table->found_next_number_field; thd_proc_info(&thd, "upgrading lock"); if (thr_upgrade_write_delay_lock(*thd.lock->locks)) { /* This can only happen if thread is killed by shutdown */ sql_print_error(ER(ER_DELAYED_CANT_CHANGE_LOCK),table->s->table_name); goto err; } thd_proc_info(&thd, "insert"); max_rows= delayed_insert_limit; if (thd.killed || table->needs_reopen_or_name_lock()) { thd.killed= THD::KILL_CONNECTION; max_rows= ~(ulong)0; // Do as much as possible } /* We can't use row caching when using the binary log because if we get a crash, then binary log will contain rows that are not yet written to disk, which will cause problems in replication. */ if (!using_bin_log) table->file->extra(HA_EXTRA_WRITE_CACHE); pthread_mutex_lock(&mutex); /* Reset auto-increment cacheing */ if (thd.clear_next_insert_id) { thd.next_insert_id= 0; thd.clear_next_insert_id= 0; } while ((row=rows.get())) { stacked_inserts--; pthread_mutex_unlock(&mutex); memcpy(table->record[0],row->record,table->s->reclength); thd.start_time=row->start_time; thd.query_start_used=row->query_start_used; thd.last_insert_id=row->last_insert_id; thd.last_insert_id_used=row->last_insert_id_used; thd.insert_id_used=row->insert_id_used; table->timestamp_field_type= row->timestamp_field_type; /* The session variable settings can always be copied. */ thd.variables.auto_increment_increment= row->auto_increment_increment; thd.variables.auto_increment_offset= row->auto_increment_offset; /* Next insert id must be used only if non-zero. */ if (row->next_insert_id) thd.next_insert_id= row->next_insert_id; DBUG_PRINT("loop", ("next_insert_id: %lu", (ulong) thd.next_insert_id)); info.ignore= row->ignore; info.handle_duplicates= row->dup; if (info.handle_duplicates == DUP_UPDATE || info.handle_duplicates == DUP_REPLACE) table->file->extra(HA_EXTRA_RETRIEVE_PRIMARY_KEY); if (info.ignore || info.handle_duplicates != DUP_ERROR) { table->file->extra(HA_EXTRA_IGNORE_DUP_KEY); using_ignore=1; } if (info.handle_duplicates == DUP_REPLACE && (!table->triggers || !table->triggers->has_delete_triggers())) { table->file->extra(HA_EXTRA_WRITE_CAN_REPLACE); using_opt_replace= 1; } if (info.handle_duplicates == DUP_UPDATE) table->file->extra(HA_EXTRA_INSERT_WITH_UPDATE); thd.clear_error(); // reset error for binlog if (write_record(&thd, table, &info)) { info.error_count++; // Ignore errors thread_safe_increment(delayed_insert_errors,&LOCK_delayed_status); row->log_query = 0; /* We must reset next_insert_id. Otherwise all following rows may become duplicates. If write_record() failed on a duplicate and next_insert_id would be left unchanged, the next rows would also be tried with the same insert id and would fail. Since the end of a multi-row statement is unknown here, all following rows in the queue would be dropped, regardless which thread added them. After the queue is used up, next_insert_id is cleared and the next run will succeed. This could even happen if these come from the same multi-row statement as the current queue contents. That way it would look somewhat random which rows are rejected after a duplicate. */ thd.next_insert_id= 0; } if (using_ignore) { using_ignore=0; table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY); } if (using_opt_replace) { using_opt_replace= 0; table->file->extra(HA_EXTRA_WRITE_CANNOT_REPLACE); } if (row->query && row->log_query && using_bin_log) { bool backup_time_zone_used = thd.time_zone_used; Time_zone *backup_time_zone = thd.variables.time_zone; if (row->time_zone != NULL) { thd.time_zone_used = true; thd.variables.time_zone = row->time_zone; } Query_log_event qinfo(&thd, row->query, row->query_length, 0, FALSE); mysql_bin_log.write(&qinfo); thd.time_zone_used = backup_time_zone_used; thd.variables.time_zone = backup_time_zone; } if (table->s->blob_fields) free_delayed_insert_blobs(table); thread_safe_sub(delayed_rows_in_use,1,&LOCK_delayed_status); thread_safe_increment(delayed_insert_writes,&LOCK_delayed_status); pthread_mutex_lock(&mutex); delete row; /* Let READ clients do something once in a while We should however not break in the middle of a multi-line insert if we have binary logging enabled as we don't want other commands on this table until all entries has been processed */ if (group_count++ >= max_rows && (row= rows.head()) && (!(row->log_query & using_bin_log) || row->query)) { group_count=0; if (stacked_inserts || tables_in_use) // Let these wait a while { if (tables_in_use) pthread_cond_broadcast(&cond_client); // If waiting clients thd_proc_info(&thd, "reschedule"); pthread_mutex_unlock(&mutex); if ((error=table->file->extra(HA_EXTRA_NO_CACHE))) { /* This should never happen */ table->file->print_error(error,MYF(0)); sql_print_error("%s",thd.net.last_error); DBUG_PRINT("error", ("HA_EXTRA_NO_CACHE failed in loop")); goto err; } query_cache_invalidate3(&thd, table, 1); if (thr_reschedule_write_lock(*thd.lock->locks)) { /* This should never happen */ sql_print_error(ER(ER_DELAYED_CANT_CHANGE_LOCK),table->s->table_name); } if (!using_bin_log) table->file->extra(HA_EXTRA_WRITE_CACHE); pthread_mutex_lock(&mutex); thd_proc_info(&thd, "insert"); } if (tables_in_use) pthread_cond_broadcast(&cond_client); // If waiting clients } } thd_proc_info(&thd, 0); table->next_number_field=0; pthread_mutex_unlock(&mutex); if ((error=table->file->extra(HA_EXTRA_NO_CACHE))) { // This shouldn't happen table->file->print_error(error,MYF(0)); sql_print_error("%s",thd.net.last_error); DBUG_PRINT("error", ("HA_EXTRA_NO_CACHE failed after loop")); goto err; } query_cache_invalidate3(&thd, table, 1); pthread_mutex_lock(&mutex); DBUG_RETURN(0); err: DBUG_EXECUTE("error", max_rows= 0;); /* Remove all not used rows */ while ((row=rows.get())) { if (table->s->blob_fields) { memcpy(table->record[0],row->record,table->s->reclength); free_delayed_insert_blobs(table); } delete row; thread_safe_increment(delayed_insert_errors,&LOCK_delayed_status); stacked_inserts--; DBUG_EXECUTE("error", max_rows++;); } DBUG_PRINT("error", ("dropped %lu rows after an error", max_rows)); thread_safe_increment(delayed_insert_errors, &LOCK_delayed_status); pthread_mutex_lock(&mutex); DBUG_RETURN(1); } #endif /* EMBEDDED_LIBRARY */ /*************************************************************************** Store records in INSERT ... SELECT * ***************************************************************************/ /* make insert specific preparation and checks after opening tables SYNOPSIS mysql_insert_select_prepare() thd thread handler RETURN FALSE OK TRUE Error */ bool mysql_insert_select_prepare(THD *thd) { LEX *lex= thd->lex; SELECT_LEX *select_lex= &lex->select_lex; TABLE_LIST *first_select_leaf_table; DBUG_ENTER("mysql_insert_select_prepare"); /* SELECT_LEX do not belong to INSERT statement, so we can't add WHERE clause if table is VIEW */ if (mysql_prepare_insert(thd, lex->query_tables, lex->query_tables->table, lex->field_list, 0, lex->update_list, lex->value_list, lex->duplicates, &select_lex->where, TRUE, FALSE, FALSE)) DBUG_RETURN(TRUE); /* exclude first table from leaf tables list, because it belong to INSERT */ DBUG_ASSERT(select_lex->leaf_tables != 0); lex->leaf_tables_insert= select_lex->leaf_tables; /* skip all leaf tables belonged to view where we are insert */ for (first_select_leaf_table= select_lex->leaf_tables->next_leaf; first_select_leaf_table && first_select_leaf_table->belong_to_view && first_select_leaf_table->belong_to_view == lex->leaf_tables_insert->belong_to_view; first_select_leaf_table= first_select_leaf_table->next_leaf) {} select_lex->leaf_tables= first_select_leaf_table; DBUG_RETURN(FALSE); } select_insert::select_insert(TABLE_LIST *table_list_par, TABLE *table_par, List *fields_par, List *update_fields, List *update_values, enum_duplicates duplic, bool ignore_check_option_errors) :table_list(table_list_par), table(table_par), fields(fields_par), autoinc_value_of_last_inserted_row(0), autoinc_value_of_first_inserted_row(0), insert_into_view(table_list_par && table_list_par->view != 0) { bzero((char*) &info,sizeof(info)); info.handle_duplicates= duplic; info.ignore= ignore_check_option_errors; info.update_fields= update_fields; info.update_values= update_values; if (table_list_par) info.view= (table_list_par->view ? table_list_par : 0); } int select_insert::prepare(List &values, SELECT_LEX_UNIT *u) { LEX *lex= thd->lex; int res; table_map map= 0; SELECT_LEX *lex_current_select_save= lex->current_select; DBUG_ENTER("select_insert::prepare"); unit= u; /* Since table in which we are going to insert is added to the first select, LEX::current_select should point to the first select while we are fixing fields from insert list. */ lex->current_select= &lex->select_lex; res= check_insert_fields(thd, table_list, *fields, values, !insert_into_view, &map) || setup_fields(thd, 0, values, 0, 0, 0); if (!res && fields->elements) { bool saved_abort_on_warning= thd->abort_on_warning; thd->abort_on_warning= !info.ignore && (thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES)); res= check_that_all_fields_are_given_values(thd, table_list->table, table_list); thd->abort_on_warning= saved_abort_on_warning; } if (info.handle_duplicates == DUP_UPDATE && !res) { Name_resolution_context *context= &lex->select_lex.context; Name_resolution_context_state ctx_state; /* Save the state of the current name resolution context. */ ctx_state.save_state(context, table_list); /* Perform name resolution only in the first table - 'table_list'. */ table_list->next_local= 0; context->resolve_in_table_list_only(table_list); lex->select_lex.no_wrap_view_item= TRUE; res= res || check_update_fields(thd, context->table_list, *info.update_fields, &map); lex->select_lex.no_wrap_view_item= FALSE; /* When we are not using GROUP BY and there are no ungrouped aggregate functions we can refer to other tables in the ON DUPLICATE KEY part. We use next_name_resolution_table descructively, so check it first (views?) */ DBUG_ASSERT (!table_list->next_name_resolution_table); if (lex->select_lex.group_list.elements == 0 && !lex->select_lex.with_sum_func) /* We must make a single context out of the two separate name resolution contexts : the INSERT table and the tables in the SELECT part of INSERT ... SELECT. To do that we must concatenate the two lists */ table_list->next_name_resolution_table= ctx_state.get_first_name_resolution_table(); res= res || setup_fields(thd, 0, *info.update_values, 1, 0, 0); if (!res) { /* Traverse the update values list and substitute fields from the select for references (Item_ref objects) to them. This is done in order to get correct values from those fields when the select employs a temporary table. */ List_iterator li(*info.update_values); Item *item; while ((item= li++)) { item->transform(&Item::update_value_transformer, (byte*)lex->current_select); } } /* Restore the current context. */ ctx_state.restore_state(context, table_list); } lex->current_select= lex_current_select_save; if (res) DBUG_RETURN(1); /* if it is INSERT into join view then check_insert_fields already found real table for insert */ table= table_list->table; /* Is table which we are changing used somewhere in other parts of query */ if (unique_table(thd, table_list, table_list->next_global, 0)) { /* Using same table for INSERT and SELECT */ lex->current_select->options|= OPTION_BUFFER_RESULT; lex->current_select->join->select_options|= OPTION_BUFFER_RESULT; } else if (!(lex->current_select->options & OPTION_BUFFER_RESULT) && !thd->prelocked_mode) { /* We must not yet prepare the result table if it is the same as one of the source tables (INSERT SELECT). The preparation may disable indexes on the result table, which may be used during the select, if it is the same table (Bug #6034). Do the preparation after the select phase in select_insert::prepare2(). We won't start bulk inserts at all if this statement uses functions or should invoke triggers since they may access to the same table too. */ table->file->start_bulk_insert((ha_rows) 0); } restore_record(table,s->default_values); // Get empty record table->next_number_field=table->found_next_number_field; #ifdef HAVE_REPLICATION if (thd->slave_thread && (info.handle_duplicates == DUP_UPDATE) && (table->next_number_field != NULL) && rpl_master_has_bug(&active_mi->rli, 24432)) DBUG_RETURN(1); #endif thd->cuted_fields=0; if (info.ignore || info.handle_duplicates != DUP_ERROR) table->file->extra(HA_EXTRA_IGNORE_DUP_KEY); if (info.handle_duplicates == DUP_REPLACE) { if (!table->triggers || !table->triggers->has_delete_triggers()) table->file->extra(HA_EXTRA_WRITE_CAN_REPLACE); table->file->extra(HA_EXTRA_RETRIEVE_ALL_COLS); } if (info.handle_duplicates == DUP_UPDATE) table->file->extra(HA_EXTRA_INSERT_WITH_UPDATE); thd->abort_on_warning= (!info.ignore && (thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES))); res= (table_list->prepare_where(thd, 0, TRUE) || table_list->prepare_check_option(thd)); if (!res) prepare_triggers_for_insert_stmt(thd, table, info.handle_duplicates); DBUG_RETURN(res); } /* Finish the preparation of the result table. SYNOPSIS select_insert::prepare2() void DESCRIPTION If the result table is the same as one of the source tables (INSERT SELECT), the result table is not finally prepared at the join prepair phase. Do the final preparation now. RETURN 0 OK */ int select_insert::prepare2(void) { DBUG_ENTER("select_insert::prepare2"); if (thd->lex->current_select->options & OPTION_BUFFER_RESULT && !thd->prelocked_mode) table->file->start_bulk_insert((ha_rows) 0); DBUG_RETURN(0); } void select_insert::cleanup() { /* select_insert/select_create are never re-used in prepared statement */ DBUG_ASSERT(0); } select_insert::~select_insert() { DBUG_ENTER("~select_insert"); if (table) { table->next_number_field=0; table->auto_increment_field_not_null= FALSE; table->file->reset(); } thd->count_cuted_fields= CHECK_FIELD_IGNORE; thd->abort_on_warning= 0; DBUG_VOID_RETURN; } bool select_insert::send_data(List &values) { DBUG_ENTER("select_insert::send_data"); bool error=0; if (unit->offset_limit_cnt) { // using limit offset,count unit->offset_limit_cnt--; DBUG_RETURN(0); } thd->count_cuted_fields= CHECK_FIELD_WARN; // Calculate cuted fields store_values(values); thd->count_cuted_fields= CHECK_FIELD_IGNORE; if (thd->net.report_error) DBUG_RETURN(1); if (table_list) // Not CREATE ... SELECT { switch (table_list->view_check_option(thd, info.ignore)) { case VIEW_CHECK_SKIP: DBUG_RETURN(0); case VIEW_CHECK_ERROR: DBUG_RETURN(1); } } error= write_record(thd, table, &info); table->auto_increment_field_not_null= FALSE; if (!error) { if (table->triggers || info.handle_duplicates == DUP_UPDATE) { /* Restore fields of the record since it is possible that they were changed by ON DUPLICATE KEY UPDATE clause. If triggers exist then whey can modify some fields which were not originally touched by INSERT ... SELECT, so we have to restore their original values for the next row. */ restore_record(table, s->default_values); } if (table->next_number_field) { /* If no value has been autogenerated so far, we need to remember the value we just saw, we may need to send it to client in the end. */ if (!thd->insert_id_used) autoinc_value_of_last_inserted_row= table->next_number_field->val_int(); /* Clear auto-increment field for the next record, if triggers are used we will clear it twice, but this should be cheap. */ table->next_number_field->reset(); if (!autoinc_value_of_last_inserted_row && thd->insert_id_used) autoinc_value_of_last_inserted_row= thd->last_insert_id; } } if (thd->insert_id_used && !autoinc_value_of_first_inserted_row) autoinc_value_of_first_inserted_row= thd->last_insert_id; DBUG_RETURN(error); } void select_insert::store_values(List &values) { if (fields->elements) fill_record_n_invoke_before_triggers(thd, *fields, values, 1, table->triggers, TRG_EVENT_INSERT); else fill_record_n_invoke_before_triggers(thd, table->field, values, 1, table->triggers, TRG_EVENT_INSERT); } void select_insert::send_error(uint errcode,const char *err) { DBUG_ENTER("select_insert::send_error"); my_message(errcode, err, MYF(0)); DBUG_VOID_RETURN; } bool select_insert::send_eof() { int error, error2; bool changed, transactional_table= table->file->has_transactions(); ulonglong id; THD::killed_state killed_status= thd->killed; DBUG_ENTER("select_insert::send_eof"); error= (!thd->prelocked_mode) ? table->file->end_bulk_insert():0; table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY); table->file->extra(HA_EXTRA_WRITE_CANNOT_REPLACE); /* We must invalidate the table in the query cache before binlog writing and ha_autocommit_or_rollback */ if (changed= (info.copied || info.deleted || info.updated)) { query_cache_invalidate3(thd, table, 1); if (thd->transaction.stmt.modified_non_trans_table) thd->transaction.all.modified_non_trans_table= TRUE; } DBUG_ASSERT(transactional_table || !changed || thd->transaction.stmt.modified_non_trans_table); // For binary log if (autoinc_value_of_last_inserted_row) { if (info.copied) thd->insert_id(autoinc_value_of_last_inserted_row); else { autoinc_value_of_first_inserted_row= 0; thd->insert_id(0); } } /* Write to binlog before commiting transaction */ if (mysql_bin_log.is_open()) { if (!error) thd->clear_error(); Query_log_event qinfo(thd, thd->query, thd->query_length, transactional_table, FALSE, killed_status); mysql_bin_log.write(&qinfo); } if ((error2=ha_autocommit_or_rollback(thd,error)) && ! error) error=error2; if (error) { table->file->print_error(error,MYF(0)); DBUG_RETURN(1); } char buff[160]; if (info.ignore) sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records, (ulong) (info.records - info.copied), (ulong) thd->cuted_fields); else sprintf(buff, ER(ER_INSERT_INFO), (ulong) info.records, (ulong) (info.deleted+info.updated), (ulong) thd->cuted_fields); thd->row_count_func= info.copied + info.deleted + ((thd->client_capabilities & CLIENT_FOUND_ROWS) ? info.touched : info.updated); id= autoinc_value_of_first_inserted_row > 0 ? autoinc_value_of_first_inserted_row : thd->insert_id_used ? thd->last_insert_id : 0; ::send_ok(thd, (ulong) thd->row_count_func, id, buff); DBUG_RETURN(0); } void select_insert::abort() { bool changed, transactional_table; DBUG_ENTER("select_insert::abort"); if (!table) { /* This can only happen when using CREATE ... SELECT and the table was not created becasue of an syntax error */ DBUG_VOID_RETURN; } changed= (info.copied || info.deleted || info.updated); transactional_table= table->file->has_transactions(); if (!thd->prelocked_mode) table->file->end_bulk_insert(); /* If at least one row has been inserted/modified and will stay in the table (the table doesn't have transactions) (example: we got a duplicate key error while inserting into a MyISAM table) we must write to the binlog (and the error code will make the slave stop). */ if (thd->transaction.stmt.modified_non_trans_table) { // For binary log if (autoinc_value_of_last_inserted_row) { if (info.copied) thd->insert_id(autoinc_value_of_last_inserted_row); else { autoinc_value_of_first_inserted_row= 0; thd->insert_id(0); } } if (mysql_bin_log.is_open()) { Query_log_event qinfo(thd, thd->query, thd->query_length, transactional_table, FALSE); mysql_bin_log.write(&qinfo); } if (thd->transaction.stmt.modified_non_trans_table) thd->transaction.all.modified_non_trans_table= TRUE; } DBUG_ASSERT(transactional_table || !changed || thd->transaction.stmt.modified_non_trans_table); if (changed) { query_cache_invalidate3(thd, table, 1); } ha_rollback_stmt(thd); DBUG_VOID_RETURN; } /*************************************************************************** CREATE TABLE (SELECT) ... ***************************************************************************/ /* Create table from lists of fields and items (or just return TABLE object for pre-opened existing table). SYNOPSIS create_table_from_items() thd in Thread object create_info in Create information (like MAX_ROWS, ENGINE or temporary table flag) create_table in Pointer to TABLE_LIST object providing database and name for table to be created or to be open alter_info in/out Initial list of columns and indexes for the table to be created items in List of items which should be used to produce rest of fields for the table (corresponding fields will be added to the end of alter_info->create_list) lock out Pointer to the MYSQL_LOCK object for table created (or open temporary table) will be returned in this parameter. Since this table is not included in THD::lock caller is responsible for explicitly unlocking this table. NOTES This function behaves differently for base and temporary tables: - For base table we assume that either table exists and was pre-opened and locked at open_and_lock_tables() stage (and in this case we just emit error or warning and return pre-opened TABLE object) or special placeholder was put in table cache that guarantees that this table won't be created or opened until the placeholder will be removed (so there is an exclusive lock on this table). - We don't pre-open existing temporary table, instead we either open or create and then open table in this function. Since this function contains some logic specific to CREATE TABLE ... SELECT it should be changed before it can be used in other contexts. RETURN VALUES non-zero Pointer to TABLE object for table created or opened 0 Error */ static TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info, TABLE_LIST *create_table, Alter_info *alter_info, List *items, MYSQL_LOCK **lock) { TABLE tmp_table; // Used during 'create_field()' TABLE *table= 0; uint select_field_count= items->elements; /* Add selected items to field list */ List_iterator_fast it(*items); Item *item; Field *tmp_field; bool not_used; DBUG_ENTER("create_table_from_items"); DBUG_EXECUTE_IF("sleep_create_select_before_check_if_exists", my_sleep(6000000);); if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE) && create_table->table->db_stat) { /* Table already exists and was open at open_and_lock_tables() stage. */ if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS) { create_info->table_existed= 1; // Mark that table existed push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR), create_table->table_name); DBUG_RETURN(create_table->table); } my_error(ER_TABLE_EXISTS_ERROR, MYF(0), create_table->table_name); DBUG_RETURN(0); } tmp_table.alias= 0; tmp_table.timestamp_field= 0; tmp_table.s= &tmp_table.share_not_to_be_used; tmp_table.s->db_create_options=0; tmp_table.s->blob_ptr_size= portable_sizeof_char_ptr; tmp_table.s->db_low_byte_first= test(create_info->db_type == DB_TYPE_MYISAM || create_info->db_type == DB_TYPE_HEAP); tmp_table.null_row=tmp_table.maybe_null=0; while ((item=it++)) { create_field *cr_field; Field *field, *def_field; if (item->type() == Item::FUNC_ITEM) if (item->result_type() != STRING_RESULT) field= item->tmp_table_field(&tmp_table); else field= item->tmp_table_field_from_field_type(&tmp_table); else field= create_tmp_field(thd, &tmp_table, item, item->type(), (Item ***) 0, &tmp_field, &def_field, 0, 0, 0, 0, 0); if (!field || !(cr_field=new create_field(field,(item->type() == Item::FIELD_ITEM ? ((Item_field *)item)->field : (Field*) 0)))) DBUG_RETURN(0); if (item->maybe_null) cr_field->flags &= ~NOT_NULL_FLAG; alter_info->create_list.push_back(cr_field); } DBUG_EXECUTE_IF("sleep_create_select_before_create", my_sleep(6000000);); /* Create and lock table. Note that we either creating (or opening existing) temporary table or creating base table on which name we have exclusive lock. So code below should not cause deadlocks or races. We don't log the statement, it will be logged later. If this is a HEAP table, the automatic DELETE FROM which is written to the binlog when a HEAP table is opened for the first time since startup, must not be written: 1) it would be wrong (imagine we're in CREATE SELECT: we don't want to delete from it) 2) it would be written before the CREATE TABLE, which is a wrong order. So we keep binary logging disabled when we open_table(). */ { tmp_disable_binlog(thd); if (!mysql_create_table(thd, create_table->db, create_table->table_name, create_info, alter_info, 0, select_field_count)) { if (create_info->table_existed && !(create_info->options & HA_LEX_CREATE_TMP_TABLE)) { /* This means that someone created table underneath server or it was created via different mysqld front-end to the cluster. We don't have much options but throw an error. */ my_error(ER_TABLE_EXISTS_ERROR, MYF(0), create_table->table_name); DBUG_RETURN(0); } DBUG_EXECUTE_IF("sleep_create_select_before_open", my_sleep(6000000);); if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE)) { VOID(pthread_mutex_lock(&LOCK_open)); if (reopen_name_locked_table(thd, create_table, FALSE)) { quick_rm_table(create_info->db_type, create_table->db, table_case_name(create_info, create_table->table_name)); } else table= create_table->table; VOID(pthread_mutex_unlock(&LOCK_open)); } else { if (!(table= open_table(thd, create_table, thd->mem_root, (bool*) 0, MYSQL_OPEN_TEMPORARY_ONLY)) && !create_info->table_existed) { /* This shouldn't happen as creation of temporary table should make it preparable for open. But let us do close_temporary_table() here just in case. */ close_temporary_table(thd, create_table->db, create_table->table_name); } } } reenable_binlog(thd); if (!table) // open failed DBUG_RETURN(0); } DBUG_EXECUTE_IF("sleep_create_select_before_lock", my_sleep(6000000);); table->reginfo.lock_type=TL_WRITE; if (! ((*lock)= mysql_lock_tables(thd, &table, 1, MYSQL_LOCK_IGNORE_FLUSH, ¬_used))) { if (!create_info->table_existed) drop_open_table(thd, table, create_table->db, create_table->table_name); DBUG_RETURN(0); } DBUG_RETURN(table); } int select_create::prepare(List &values, SELECT_LEX_UNIT *u) { DBUG_ENTER("select_create::prepare"); unit= u; table= create_table_from_items(thd, create_info, create_table, alter_info, &values, &lock); if (!table) DBUG_RETURN(-1); // abort() deletes table if (table->s->fields < values.elements) { my_error(ER_WRONG_VALUE_COUNT_ON_ROW, MYF(0), 1); DBUG_RETURN(-1); } /* First field to copy */ field= table->field+table->s->fields - values.elements; /* Mark all fields that are given values */ for (Field **f= field ; *f ; f++) (*f)->query_id= thd->query_id; /* Don't set timestamp if used */ table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET; table->next_number_field=table->found_next_number_field; restore_record(table,s->default_values); // Get empty record thd->cuted_fields=0; if (info.ignore || info.handle_duplicates != DUP_ERROR) table->file->extra(HA_EXTRA_IGNORE_DUP_KEY); if (info.handle_duplicates == DUP_REPLACE) { if (!table->triggers || !table->triggers->has_delete_triggers()) table->file->extra(HA_EXTRA_WRITE_CAN_REPLACE); table->file->extra(HA_EXTRA_RETRIEVE_ALL_COLS); } if (info.handle_duplicates == DUP_UPDATE) table->file->extra(HA_EXTRA_INSERT_WITH_UPDATE); if (!thd->prelocked_mode) table->file->start_bulk_insert((ha_rows) 0); thd->abort_on_warning= (!info.ignore && (thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES))); if (check_that_all_fields_are_given_values(thd, table, table_list)) DBUG_RETURN(1); table->file->extra(HA_EXTRA_WRITE_CACHE); DBUG_RETURN(0); } void select_create::store_values(List &values) { fill_record_n_invoke_before_triggers(thd, field, values, 1, table->triggers, TRG_EVENT_INSERT); } void select_create::send_error(uint errcode,const char *err) { select_insert::send_error(errcode, err); } bool select_create::send_eof() { bool tmp=select_insert::send_eof(); if (tmp) abort(); else { table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY); table->file->extra(HA_EXTRA_WRITE_CANNOT_REPLACE); if (lock) { mysql_unlock_tables(thd, lock); lock= 0; } } return tmp; } void select_create::abort() { /* Disable binlog, because we "roll back" partial inserts in ::abort by removing the table, even for non-transactional tables. */ tmp_disable_binlog(thd); select_insert::abort(); reenable_binlog(thd); if (lock) { mysql_unlock_tables(thd, lock); lock=0; } if (table) { table->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY); table->file->extra(HA_EXTRA_WRITE_CANNOT_REPLACE); if (!create_info->table_existed) drop_open_table(thd, table, create_table->db, create_table->table_name); table=0; } } /***************************************************************************** Instansiate templates *****************************************************************************/ #ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION template class List_iterator_fast; #ifndef EMBEDDED_LIBRARY template class I_List; template class I_List_iterator; template class I_List; #endif /* EMBEDDED_LIBRARY */ #endif /* HAVE_EXPLICIT_TEMPLATE_INSTANTIATION */