/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. Copyright (c) 2010, 2018, MariaDB Corporation 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ /** @file @brief Functions to copy data to or from fields This could be done with a single short function but opencoding this gives much more speed. */ #include #include "sql_priv.h" #include "sql_class.h" // THD #include static void do_field_eq(Copy_field *copy) { memcpy(copy->to_ptr,copy->from_ptr,copy->from_length); } static void do_field_1(Copy_field *copy) { copy->to_ptr[0]=copy->from_ptr[0]; } static void do_field_2(Copy_field *copy) { copy->to_ptr[0]=copy->from_ptr[0]; copy->to_ptr[1]=copy->from_ptr[1]; } static void do_field_3(Copy_field *copy) { copy->to_ptr[0]=copy->from_ptr[0]; copy->to_ptr[1]=copy->from_ptr[1]; copy->to_ptr[2]=copy->from_ptr[2]; } static void do_field_4(Copy_field *copy) { copy->to_ptr[0]=copy->from_ptr[0]; copy->to_ptr[1]=copy->from_ptr[1]; copy->to_ptr[2]=copy->from_ptr[2]; copy->to_ptr[3]=copy->from_ptr[3]; } static void do_field_6(Copy_field *copy) { // For blob field copy->to_ptr[0]=copy->from_ptr[0]; copy->to_ptr[1]=copy->from_ptr[1]; copy->to_ptr[2]=copy->from_ptr[2]; copy->to_ptr[3]=copy->from_ptr[3]; copy->to_ptr[4]=copy->from_ptr[4]; copy->to_ptr[5]=copy->from_ptr[5]; } static void do_field_8(Copy_field *copy) { copy->to_ptr[0]=copy->from_ptr[0]; copy->to_ptr[1]=copy->from_ptr[1]; copy->to_ptr[2]=copy->from_ptr[2]; copy->to_ptr[3]=copy->from_ptr[3]; copy->to_ptr[4]=copy->from_ptr[4]; copy->to_ptr[5]=copy->from_ptr[5]; copy->to_ptr[6]=copy->from_ptr[6]; copy->to_ptr[7]=copy->from_ptr[7]; } static void do_field_to_null_str(Copy_field *copy) { if (*copy->from_null_ptr & copy->from_bit) { bzero(copy->to_ptr,copy->from_length); copy->to_null_ptr[0]=1; // Always bit 1 } else { copy->to_null_ptr[0]=0; memcpy(copy->to_ptr,copy->from_ptr,copy->from_length); } } static void do_outer_field_to_null_str(Copy_field *copy) { if (*copy->null_row || (copy->from_null_ptr && (*copy->from_null_ptr & copy->from_bit))) { bzero(copy->to_ptr,copy->from_length); copy->to_null_ptr[0]=1; // Always bit 1 } else { copy->to_null_ptr[0]=0; memcpy(copy->to_ptr,copy->from_ptr,copy->from_length); } } static int set_bad_null_error(Field *field, int err) { switch (field->table->in_use->count_cuted_fields) { case CHECK_FIELD_WARN: field->set_warning(Sql_condition::WARN_LEVEL_WARN, err, 1); /* fall through */ case CHECK_FIELD_IGNORE: return 0; case CHECK_FIELD_ERROR_FOR_NULL: if (!field->table->in_use->no_errors) my_error(ER_BAD_NULL_ERROR, MYF(0), field->field_name); return -1; } DBUG_ASSERT(0); // impossible return -1; } int set_field_to_null(Field *field) { if (field->table->null_catch_flags & CHECK_ROW_FOR_NULLS_TO_REJECT) { field->table->null_catch_flags|= REJECT_ROW_DUE_TO_NULL_FIELDS; return -1; } if (field->real_maybe_null()) { field->set_null(); field->reset(); return 0; } field->reset(); return set_bad_null_error(field, WARN_DATA_TRUNCATED); } /** Set TIMESTAMP to NOW(), AUTO_INCREMENT to the next number, or report an error @param field Field to update @retval 0 Field could take 0 or an automatic conversion was used @retval -1 Field could not take NULL and no conversion was used. If no_conversion was not set, an error message is printed */ int convert_null_to_field_value_or_error(Field *field) { if (field->type() == MYSQL_TYPE_TIMESTAMP) { ((Field_timestamp*) field)->set_time(); return 0; } field->reset(); // Note: we ignore any potential failure of reset() here. if (field == field->table->next_number_field) { field->table->auto_increment_field_not_null= FALSE; return 0; // field is set in fill_record() } return set_bad_null_error(field, ER_BAD_NULL_ERROR); } /** Set field to NULL or TIMESTAMP or to next auto_increment number. @param field Field to update @param no_conversions Set to 1 if we should return 1 if field can't take null values. If set to 0 we will do store the 'default value' if the field is a special field. If not we will give an error. @retval 0 Field could take 0 or an automatic conversion was used @retval -1 Field could not take NULL and no conversion was used. If no_conversion was not set, an error message is printed */ int set_field_to_null_with_conversions(Field *field, bool no_conversions) { if (field->table->null_catch_flags & CHECK_ROW_FOR_NULLS_TO_REJECT) { field->table->null_catch_flags|= REJECT_ROW_DUE_TO_NULL_FIELDS; return -1; } if (field->real_maybe_null()) { field->set_null(); field->reset(); return 0; } if (no_conversions) return -1; return convert_null_to_field_value_or_error(field); } static int copy_timestamp_fields(Field *from, Field *to) { DBUG_ASSERT(from->type() == MYSQL_TYPE_TIMESTAMP); DBUG_ASSERT(to->type() == MYSQL_TYPE_TIMESTAMP); return ((Field_timestamp*)to)->store_timestamp((Field_timestamp*)from); } static void do_skip(Copy_field *copy __attribute__((unused))) { } /* Copy: (NULLable field) -> (NULLable field) note: if the record we're copying from is NULL-complemetned (i.e. from_field->table->null_row==1), it will also have all NULLable columns to be set to NULLs, so we dont need to check table->null_row here. */ static void do_copy_null(Copy_field *copy) { if (*copy->from_null_ptr & copy->from_bit) { *copy->to_null_ptr|=copy->to_bit; copy->to_field->reset(); } else { *copy->to_null_ptr&= ~copy->to_bit; (copy->do_copy2)(copy); } } /* Copy: (not-NULL field in table that can be NULL-complemented) -> (NULLable field) */ static void do_outer_field_null(Copy_field *copy) { if (*copy->null_row || (copy->from_null_ptr && (*copy->from_null_ptr & copy->from_bit))) { *copy->to_null_ptr|=copy->to_bit; copy->to_field->reset(); } else { *copy->to_null_ptr&= ~copy->to_bit; (copy->do_copy2)(copy); } } /* Copy: (not-NULL field in table that can be NULL-complemented) -> (not-NULL field) */ static void do_copy_nullable_row_to_notnull(Copy_field *copy) { if (*copy->null_row || (copy->from_null_ptr && (*copy->from_null_ptr & copy->from_bit))) { copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); copy->to_field->reset(); } else { (copy->do_copy2)(copy); } } /* Copy: (NULL-able field) -> (not NULL-able field) */ static void do_copy_not_null(Copy_field *copy) { if (*copy->from_null_ptr & copy->from_bit) { copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); copy->to_field->reset(); } else (copy->do_copy2)(copy); } /* Copy: (non-NULLable field) -> (NULLable field) */ static void do_copy_maybe_null(Copy_field *copy) { *copy->to_null_ptr&= ~copy->to_bit; (copy->do_copy2)(copy); } /* timestamp and next_number has special handling in case of NULL values */ static void do_copy_timestamp(Copy_field *copy) { if (*copy->from_null_ptr & copy->from_bit) { /* Same as in set_field_to_null_with_conversions() */ ((Field_timestamp*) copy->to_field)->set_time(); } else (copy->do_copy2)(copy); } static void do_copy_next_number(Copy_field *copy) { if (*copy->from_null_ptr & copy->from_bit) { /* Same as in set_field_to_null_with_conversions() */ copy->to_field->table->auto_increment_field_not_null= FALSE; copy->to_field->reset(); } else (copy->do_copy2)(copy); } static void do_copy_blob(Copy_field *copy) { ((Field_blob*) copy->to_field)->copy_value(((Field_blob*) copy->from_field)); } static void do_conv_blob(Copy_field *copy) { copy->from_field->val_str(©->tmp); ((Field_blob *) copy->to_field)->store(copy->tmp.ptr(), copy->tmp.length(), copy->tmp.charset()); } /** Save blob in copy->tmp for GROUP BY. */ static void do_save_blob(Copy_field *copy) { char buff[MAX_FIELD_WIDTH]; String res(buff,sizeof(buff),copy->tmp.charset()); copy->from_field->val_str(&res); copy->tmp.copy(res); ((Field_blob *) copy->to_field)->store(copy->tmp.ptr(), copy->tmp.length(), copy->tmp.charset()); } static void do_field_string(Copy_field *copy) { char buff[MAX_FIELD_WIDTH]; String res(buff, sizeof(buff), copy->from_field->charset()); res.length(0U); copy->from_field->val_str(&res); copy->to_field->store(res.c_ptr_quick(), res.length(), res.charset()); } static void do_field_enum(Copy_field *copy) { if (copy->from_field->val_int() == 0) ((Field_enum *) copy->to_field)->store_type((ulonglong) 0); else do_field_string(copy); } static void do_field_varbinary_pre50(Copy_field *copy) { char buff[MAX_FIELD_WIDTH]; copy->tmp.set_quick(buff,sizeof(buff),copy->tmp.charset()); copy->from_field->val_str(©->tmp); /* Use the same function as in 4.1 to trim trailing spaces */ uint length= my_lengthsp_8bit(&my_charset_bin, copy->tmp.c_ptr_quick(), copy->from_field->field_length); copy->to_field->store(copy->tmp.c_ptr_quick(), length, copy->tmp.charset()); } static void do_field_int(Copy_field *copy) { longlong value= copy->from_field->val_int(); copy->to_field->store(value, MY_TEST(copy->from_field->flags & UNSIGNED_FLAG)); } static void do_field_real(Copy_field *copy) { double value=copy->from_field->val_real(); copy->to_field->store(value); } static void do_field_decimal(Copy_field *copy) { my_decimal value; copy->to_field->store_decimal(copy->from_field->val_decimal(&value)); } static void do_field_timestamp(Copy_field *copy) { copy_timestamp_fields(copy->from_field, copy->to_field); } static void do_field_temporal(Copy_field *copy) { MYSQL_TIME ltime; copy->from_field->get_date(<ime, 0); copy->to_field->store_time_dec(<ime, copy->from_field->decimals()); } /** string copy for single byte characters set when to string is shorter than from string. */ static void do_cut_string(Copy_field *copy) { CHARSET_INFO *cs= copy->from_field->charset(); memcpy(copy->to_ptr,copy->from_ptr,copy->to_length); /* Check if we loosed any important characters */ if (cs->cset->scan(cs, (char*) copy->from_ptr + copy->to_length, (char*) copy->from_ptr + copy->from_length, MY_SEQ_SPACES) < copy->from_length - copy->to_length) { copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); } } /** string copy for multi byte characters set when to string is shorter than from string. */ static void do_cut_string_complex(Copy_field *copy) { // Shorter string field int well_formed_error; CHARSET_INFO *cs= copy->from_field->charset(); const uchar *from_end= copy->from_ptr + copy->from_length; uint copy_length= cs->cset->well_formed_len(cs, (char*) copy->from_ptr, (char*) from_end, copy->to_length / cs->mbmaxlen, &well_formed_error); if (copy->to_length < copy_length) copy_length= copy->to_length; memcpy(copy->to_ptr, copy->from_ptr, copy_length); /* Check if we lost any important characters */ if (well_formed_error || cs->cset->scan(cs, (char*) copy->from_ptr + copy_length, (char*) from_end, MY_SEQ_SPACES) < (copy->from_length - copy_length)) { copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); } if (copy_length < copy->to_length) cs->cset->fill(cs, (char*) copy->to_ptr + copy_length, copy->to_length - copy_length, ' '); } static void do_expand_binary(Copy_field *copy) { CHARSET_INFO *cs= copy->from_field->charset(); memcpy(copy->to_ptr,copy->from_ptr,copy->from_length); cs->cset->fill(cs, (char*) copy->to_ptr+copy->from_length, copy->to_length-copy->from_length, '\0'); } static void do_expand_string(Copy_field *copy) { CHARSET_INFO *cs= copy->from_field->charset(); memcpy(copy->to_ptr,copy->from_ptr,copy->from_length); cs->cset->fill(cs, (char*) copy->to_ptr+copy->from_length, copy->to_length-copy->from_length, ' '); } static void do_varstring1(Copy_field *copy) { uint length= (uint) *(uchar*) copy->from_ptr; if (length > copy->to_length- 1) { length=copy->to_length - 1; if (copy->from_field->table->in_use->count_cuted_fields && copy->to_field) copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); } *(uchar*) copy->to_ptr= (uchar) length; memcpy(copy->to_ptr+1, copy->from_ptr + 1, length); } static void do_varstring1_mb(Copy_field *copy) { int well_formed_error; CHARSET_INFO *cs= copy->from_field->charset(); uint from_length= (uint) *(uchar*) copy->from_ptr; const uchar *from_ptr= copy->from_ptr + 1; uint to_char_length= (copy->to_length - 1) / cs->mbmaxlen; uint length= cs->cset->well_formed_len(cs, (char*) from_ptr, (char*) from_ptr + from_length, to_char_length, &well_formed_error); if (length < from_length) { if (current_thd->count_cuted_fields) copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); } *copy->to_ptr= (uchar) length; memcpy(copy->to_ptr + 1, from_ptr, length); } static void do_varstring2(Copy_field *copy) { uint length=uint2korr(copy->from_ptr); if (length > copy->to_length- HA_KEY_BLOB_LENGTH) { length=copy->to_length-HA_KEY_BLOB_LENGTH; if (copy->from_field->table->in_use->count_cuted_fields && copy->to_field) copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); } int2store(copy->to_ptr,length); memcpy(copy->to_ptr+HA_KEY_BLOB_LENGTH, copy->from_ptr + HA_KEY_BLOB_LENGTH, length); } static void do_varstring2_mb(Copy_field *copy) { int well_formed_error; CHARSET_INFO *cs= copy->from_field->charset(); uint char_length= (copy->to_length - HA_KEY_BLOB_LENGTH) / cs->mbmaxlen; uint from_length= uint2korr(copy->from_ptr); const uchar *from_beg= copy->from_ptr + HA_KEY_BLOB_LENGTH; uint length= cs->cset->well_formed_len(cs, (char*) from_beg, (char*) from_beg + from_length, char_length, &well_formed_error); if (length < from_length) { if (current_thd->count_cuted_fields) copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN, WARN_DATA_TRUNCATED, 1); } int2store(copy->to_ptr, length); memcpy(copy->to_ptr+HA_KEY_BLOB_LENGTH, from_beg, length); } /*************************************************************************** ** The different functions that fills in a Copy_field class ***************************************************************************/ /** copy of field to maybe null string. If field is null then the all bytes are set to 0. if field is not null then the first byte is set to 1 and the rest of the string is the field value. The 'to' buffer should have a size of field->pack_length()+1 */ void Copy_field::set(uchar *to,Field *from) { from_ptr=from->ptr; to_ptr=to; from_length=from->pack_length_in_rec(); if (from->maybe_null()) { from_null_ptr=from->null_ptr; from_bit= from->null_bit; to_ptr[0]= 1; // Null as default value to_null_ptr= (uchar*) to_ptr++; to_bit= 1; if (from->table->maybe_null) { null_row= &from->table->null_row; do_copy= do_outer_field_to_null_str; } else do_copy= do_field_to_null_str; } else { to_null_ptr= 0; // For easy debugging do_copy= do_field_eq; } } /* To do: If 'save' is set to true and the 'from' is a blob field, do_copy is set to do_save_blob rather than do_conv_blob. The only differences between them appears to be: - do_save_blob allocates and uses an intermediate buffer before calling Field_blob::store. Is this in order to trigger the call to well_formed_copy_nchars, by changing the pointer copy->tmp.ptr()? That call will take place anyway in all known cases. */ void Copy_field::set(Field *to,Field *from,bool save) { if (to->type() == MYSQL_TYPE_NULL) { to_null_ptr=0; // For easy debugging to_ptr=0; do_copy=do_skip; return; } from_field=from; to_field=to; from_ptr=from->ptr; from_length=from->pack_length_in_rec(); to_ptr= to->ptr; to_length=to_field->pack_length_in_rec(); // set up null handling from_null_ptr=to_null_ptr=0; if (from->maybe_null()) { from_null_ptr= from->null_ptr; from_bit= from->null_bit; if (to_field->real_maybe_null()) { to_null_ptr= to->null_ptr; to_bit= to->null_bit; if (from_null_ptr) do_copy= do_copy_null; else { null_row= &from->table->null_row; do_copy= do_outer_field_null; } } else { if (to_field->type() == MYSQL_TYPE_TIMESTAMP) do_copy= do_copy_timestamp; // Automatic timestamp else if (to_field == to_field->table->next_number_field) do_copy= do_copy_next_number; else { if (!from_null_ptr) { null_row= &from->table->null_row; do_copy= do_copy_nullable_row_to_notnull; } else do_copy= do_copy_not_null; } } } else if (to_field->real_maybe_null()) { to_null_ptr= to->null_ptr; to_bit= to->null_bit; do_copy= do_copy_maybe_null; } else do_copy=0; if ((to->flags & BLOB_FLAG) && save) do_copy2= do_save_blob; else do_copy2= get_copy_func(to,from); if (!do_copy) // Not null do_copy=do_copy2; } Copy_field::Copy_func * Copy_field::get_copy_func(Field *to,Field *from) { if (to->flags & BLOB_FLAG) { if (!(from->flags & BLOB_FLAG) || from->charset() != to->charset()) return do_conv_blob; if (from_length != to_length) return do_copy_blob; } else { if (to->real_type() == MYSQL_TYPE_BIT || from->real_type() == MYSQL_TYPE_BIT) return do_field_int; if (to->result_type() == DECIMAL_RESULT) return do_field_decimal; if (from->cmp_type() == TIME_RESULT) { /* If types are not 100 % identical then convert trough get_date() */ if (!to->eq_def(from) || ((to->table->in_use->variables.sql_mode & (MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE)) && mysql_type_to_time_type(to->type()) != MYSQL_TIMESTAMP_TIME)) return (from->type() == MYSQL_TYPE_TIMESTAMP && to->type() == MYSQL_TYPE_TIMESTAMP) ? do_field_timestamp : do_field_temporal; /* Do binary copy */ } // Check if identical fields if (from->result_type() == STRING_RESULT) { /* Detect copy from pre 5.0 varbinary to varbinary as of 5.0 and use special copy function that removes trailing spaces and thus repairs data. */ if (from->type() == MYSQL_TYPE_VAR_STRING && !from->has_charset() && to->type() == MYSQL_TYPE_VARCHAR && !to->has_charset()) return do_field_varbinary_pre50; if (to->real_type() != from->real_type()) { if (from->real_type() == MYSQL_TYPE_ENUM || from->real_type() == MYSQL_TYPE_SET) if (to->result_type() != STRING_RESULT) return do_field_int; // Convert SET to number return do_field_string; } if (to->real_type() == MYSQL_TYPE_ENUM || to->real_type() == MYSQL_TYPE_SET) { if (!to->eq_def(from)) { if (from->real_type() == MYSQL_TYPE_ENUM && to->real_type() == MYSQL_TYPE_ENUM) return do_field_enum; return do_field_string; } } else if (to->charset() != from->charset()) return do_field_string; else if (to->real_type() == MYSQL_TYPE_VARCHAR) { if (((Field_varstring*) to)->length_bytes != ((Field_varstring*) from)->length_bytes) return do_field_string; return (((Field_varstring*) to)->length_bytes == 1 ? (from->charset()->mbmaxlen == 1 ? do_varstring1 : do_varstring1_mb) : (from->charset()->mbmaxlen == 1 ? do_varstring2 : do_varstring2_mb)); } else if (to_length < from_length) return (from->charset()->mbmaxlen == 1 ? do_cut_string : do_cut_string_complex); else if (to_length > from_length) { if (to->charset() == &my_charset_bin) return do_expand_binary; return do_expand_string; } } else if (to->real_type() != from->real_type() || to_length != from_length) { if ((to->real_type() == MYSQL_TYPE_ENUM || to->real_type() == MYSQL_TYPE_SET) && from->real_type() == MYSQL_TYPE_NEWDECIMAL) return do_field_decimal; if (to->real_type() == MYSQL_TYPE_DECIMAL || to->result_type() == STRING_RESULT) return do_field_string; if (to->result_type() == INT_RESULT) return do_field_int; return do_field_real; } else { if (!to->eq_def(from)) { if (to->real_type() == MYSQL_TYPE_DECIMAL) return do_field_string; if (to->result_type() == INT_RESULT) return do_field_int; else return do_field_real; } } } /* Identical field types */ switch (to_length) { case 1: return do_field_1; case 2: return do_field_2; case 3: return do_field_3; case 4: return do_field_4; case 6: return do_field_6; case 8: return do_field_8; } return do_field_eq; } /** Check if it is possible just copy value of the fields @param to The field to copy to @param from The field to copy from @retval TRUE - it is possible to just copy value of 'from' to 'to'. @retval FALSE - conversion is needed */ bool memcpy_field_possible(Field *to,Field *from) { const enum_field_types to_real_type= to->real_type(); const enum_field_types from_real_type= from->real_type(); /* Warning: Calling from->type() may be unsafe in some (unclear) circumstances related to SPs. See MDEV-6799. */ return (to_real_type == from_real_type && !(to->flags & BLOB_FLAG && to->table->copy_blobs) && to->pack_length() == from->pack_length() && !(to->flags & UNSIGNED_FLAG && !(from->flags & UNSIGNED_FLAG)) && to->decimals() == from->decimals() && to_real_type != MYSQL_TYPE_ENUM && to_real_type != MYSQL_TYPE_SET && to_real_type != MYSQL_TYPE_BIT && (to_real_type != MYSQL_TYPE_NEWDECIMAL || to->field_length == from->field_length) && from->charset() == to->charset() && (!sql_mode_for_dates(to->table->in_use) || (from->type()!= MYSQL_TYPE_DATE && from->type()!= MYSQL_TYPE_DATETIME && from->type()!= MYSQL_TYPE_TIMESTAMP)) && (from_real_type != MYSQL_TYPE_VARCHAR || ((Field_varstring*)from)->length_bytes == ((Field_varstring*)to)->length_bytes)); } /** Simple quick field convert that is called on insert. */ int field_conv(Field *to,Field *from) { if (memcpy_field_possible(to, from)) { // Identical fields /* This may happen if one does 'UPDATE ... SET x=x' The test is here mostly for valgrind, but can also be relevant if memcpy() is implemented with prefetch-write */ if (to->ptr != from->ptr) memcpy(to->ptr, from->ptr, to->pack_length()); return 0; } return field_conv_incompatible(to, from); } /** Copy value of the field with conversion. @note Impossibility of simple copy should be checked before this call. @param to The field to copy to @param from The field to copy from @retval TRUE ERROR @retval FALSE OK */ int field_conv_incompatible(Field *to, Field *from) { const enum_field_types to_real_type= to->real_type(); const enum_field_types from_real_type= from->real_type(); if (to->flags & BLOB_FLAG) { // Be sure the value is stored Field_blob *blob=(Field_blob*) to; from->val_str(&blob->value); /* Copy value if copy_blobs is set, or source is part of the table's writeset. */ if (to->table->copy_blobs || (!blob->value.is_alloced() && from->is_updatable())) blob->value.copy(); return blob->store(blob->value.ptr(),blob->value.length(),from->charset()); } if (from_real_type == MYSQL_TYPE_ENUM && to_real_type == MYSQL_TYPE_ENUM && from->val_int() == 0) { ((Field_enum *)(to))->store_type(0); return 0; } Item_result from_result_type= from->result_type(); if (from_result_type == REAL_RESULT) return to->store(from->val_real()); if (from_result_type == DECIMAL_RESULT) { my_decimal buff; return to->store_decimal(from->val_decimal(&buff)); } if (from->type() == MYSQL_TYPE_TIMESTAMP && to->type() == MYSQL_TYPE_TIMESTAMP) { return copy_timestamp_fields(from, to); } if (from->cmp_type() == TIME_RESULT) { MYSQL_TIME ltime; if (from->get_date(<ime, 0)) return to->reset(); else return to->store_time_dec(<ime, from->decimals()); } if ((from_result_type == STRING_RESULT && (to->result_type() == STRING_RESULT || (from_real_type != MYSQL_TYPE_ENUM && from_real_type != MYSQL_TYPE_SET))) || to->type() == MYSQL_TYPE_DECIMAL) { char buff[MAX_FIELD_WIDTH]; String result(buff,sizeof(buff),from->charset()); from->val_str(&result); /* We use c_ptr_quick() here to make it easier if to is a float/double as the conversion routines will do a copy of the result doesn't end with \0. Can be replaced with .ptr() when we have our own string->double conversion. */ return to->store(result.c_ptr_quick(),result.length(),from->charset()); } return to->store(from->val_int(), MY_TEST(from->flags & UNSIGNED_FLAG)); }