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author | unknown <konstantin@mysql.com> | 2005-09-22 02:11:21 +0400 |
---|---|---|
committer | unknown <konstantin@mysql.com> | 2005-09-22 02:11:21 +0400 |
commit | d68878c310e5e26ec24fcd0f8679323902c5fc43 (patch) | |
tree | c670884265eea87654bb764c095e254eff48128d /sql/sql_class.h | |
parent | d3364e3877a2c680d84d20f4d3f06e3924a087b3 (diff) | |
download | mariadb-git-d68878c310e5e26ec24fcd0f8679323902c5fc43.tar.gz |
A fix and a test case for Bug#6513 "Test Suite: Values inserted by using
cursor is interpreted latin1 character and Bug#9819 "Cursors: Mysql Server
Crash while fetching from table with 5 million records."
A fix for a possible memory leak when fetching into an SP cursor
in a long loop.
The patch uses a common implementation of cursors in the binary protocol and
in stored procedures and implements materialized cursors.
For implementation details, see comments in sql_cursor.cc
include/my_sys.h:
- declaration for multi_alloc_root
libmysqld/Makefile.am:
- drop protocol_cursor.cc, add sql_cursor.cc (replaces the old
implementation of cursors with a new one)
mysql-test/r/ctype_ujis.result:
- test results fixed (a test case for Bug#6513)
mysql-test/r/sp-big.result:
- test results fixed (a test case for Bug#9819)
mysql-test/t/ctype_ujis.test:
Add a test case for Bug#6513 "Test Suite: Values inserted by using cursor is
interpreted latin1 character"
mysql-test/t/sp-big.test:
Add a restricted test case for Bug#9819 "Cursors: Mysql Server Crash
while fetching from table with 5 million records."
mysys/my_alloc.c:
- an implementation of multi_alloc_root; this is largely a copy-paste
from mulalloc.c, but the function is small and there is no easy way
to reuse the existing C function.
sql/Makefile.am:
- add sql_cursor.h, sql_cursor.cc (a new implementation of stored procedure
cursors) and drop protocol_cursor.cc (the old one)
sql/handler.cc:
- now TABLE object has its mem_root always initialized.
Adjust the implementation handler::ha_open
sql/item_subselect.cc:
- adjust to the changed declaration of st_select_lex_unit::prepare
sql/protocol.h:
- drop Protocol_cursor
sql/sp_head.cc:
- move juggling with Query_arena::free_list and Item::next to
sp_eval_func_item, as this is needed in 3 places already.
sql/sp_head.h:
- declare a no-op implementation for cleanup_stmt in sp_instr_cpush.
This method is needed for non-materializing cursors, which are yet not
used in stored procedures.
- declaration for sp_eval_func_item
sql/sp_rcontext.cc:
- reimplement sp_cursor using the new implementation of server side cursors.
- use sp_eval_func_item to assign values of SP variables from the
row fetched from a cursor. This should fix a possible memory leak in
the old implementation of sp_cursor::fetch
sql/sp_rcontext.h:
- reimplement sp_cursor using the new implementation of server side cursors.
sql/sql_class.cc:
- disable the functionality that closes transient cursors at commit/rollback;
transient cursors are not used in 5.0, instead we use materialized ones.
To be enabled in a later version.
sql/sql_class.h:
- adjust to the rename Cursor -> Server_side_cursor
- additional declarations of select_union used in materialized cursors
sql/sql_derived.cc:
- reuse bits of tmp table code in UNION, derived tables, and materialized
cursors
- cleanup comments
sql/sql_lex.h:
- declarations of auxiliary methods used by materialized cursors
- a cleanup in st_select_lex_unit interface
sql/sql_list.h:
- add an array operator new[] to class Sql_alloc
sql/sql_prepare.cc:
- split the tight coupling of cursors and prepared statements to reuse
the same implementation in stored procedures
- cleanups of error processing in Prepared_statement::{prepare,execute}
sql/sql_select.cc:
- move the implementation of sensitive (non-materializing) cursors to
sql_cursor.cc
- make temporary tables self-contained: the table, its record and fields
are allocated in TABLE::mem_root. This implementation is not clean
and resets thd->mem_root several times because of the way create_tmp_table
works (many additional things are done inside it).
- adjust to the changed declaration of st_select_lex_unit::prepare
sql/sql_select.h:
- move the declaration of sensitive (non-materializing) cursors to
sql_cursor.cc
sql/sql_union.cc:
- move pieces of st_select_unit::prepare to select_union and st_table
methods to be able to reuse code in the implementation of materialized
cursors
sql/sql_view.cc:
- adjust to the changed signature of st_select_lex_unit::prepare
sql/table.cc:
- implement auxiliary st_table methods for use with temporary tables
sql/table.h:
- add declarations for auxiliary methods of st_table used to work with
temporary tables
tests/mysql_client_test.c:
- if cursors are materialized, a parallel update of the table used
in the cursor may go through: update the test.
sql/sql_cursor.cc:
New BitKeeper file ``sql/sql_cursor.cc'' -- implementation of server side
cursors
sql/sql_cursor.h:
New BitKeeper file ``sql/sql_cursor.h'' - declarations for
server side cursors.
Diffstat (limited to 'sql/sql_class.h')
-rw-r--r-- | sql/sql_class.h | 26 |
1 files changed, 13 insertions, 13 deletions
diff --git a/sql/sql_class.h b/sql/sql_class.h index 1a215d39841..c853162be2d 100644 --- a/sql/sql_class.h +++ b/sql/sql_class.h @@ -737,10 +737,12 @@ public: void set_query_arena(Query_arena *set); void free_items(); + /* Close the active state associated with execution of this statement */ + virtual void cleanup_stmt(); }; -class Cursor; +class Server_side_cursor; /* State of a single command executed against this connection. @@ -816,7 +818,7 @@ public: */ char *query; uint32 query_length; // current query length - Cursor *cursor; + Server_side_cursor *cursor; public: @@ -833,8 +835,6 @@ public: void restore_backup_statement(Statement *stmt, Statement *backup); /* return class type */ virtual Type type() const; - /* Close the cursor open for this statement, if there is one */ - virtual void close_cursor(); }; @@ -886,9 +886,6 @@ public: } hash_delete(&st_hash, (byte *) statement); } - void add_transient_cursor(Statement *stmt) - { transient_cursor_list.append(stmt); } - void erase_transient_cursor(Statement *stmt) { stmt->unlink(); } /* Close all cursors of this connection that use tables of a storage engine that has transaction-specific state and therefore can not @@ -1812,18 +1809,21 @@ public: } }; -class select_union :public select_result_interceptor { - public: - TABLE *table; +class select_union :public select_result_interceptor +{ TMP_TABLE_PARAM tmp_table_param; +public: + TABLE *table; - select_union(TABLE *table_par); - ~select_union(); + select_union() :table(0) {} int prepare(List<Item> &list, SELECT_LEX_UNIT *u); bool send_data(List<Item> &items); bool send_eof(); bool flush(); - void set_table(TABLE *tbl) { table= tbl; } + + bool create_result_table(THD *thd, List<Item> *column_types, + bool is_distinct, ulonglong options, + const char *alias); }; /* Base subselect interface class */ |