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136 lines
4 KiB
C++
136 lines
4 KiB
C++
/*****************************************************************************
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Copyright (c) 1996, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2019, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/dict0crea.ic
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Database object creation
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Created 1/8/1996 Heikki Tuuri
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*******************************************************/
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#include "ha_prototypes.h"
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#include "mem0mem.h"
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/********************************************************************//**
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Generate a foreign key constraint name when it was not named by the user.
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A generated constraint has a name of the format dbname/tablename_ibfk_NUMBER,
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where the numbers start from 1, and are given locally for this table, that is,
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the number is not global, as it used to be before MySQL 4.0.18. */
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UNIV_INLINE
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dberr_t
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dict_create_add_foreign_id(
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/*=======================*/
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ulint* id_nr, /*!< in/out: number to use in id generation;
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incremented if used */
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const char* name, /*!< in: table name */
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dict_foreign_t* foreign)/*!< in/out: foreign key */
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{
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DBUG_ENTER("dict_create_add_foreign_id");
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if (foreign->id == NULL) {
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/* Generate a new constraint id */
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ulint namelen = strlen(name);
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char* id = static_cast<char*>(
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mem_heap_alloc(foreign->heap,
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namelen + 20));
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if (dict_table_t::is_temporary_name(name)) {
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/* no overflow if number < 1e13 */
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sprintf(id, "%s_ibfk_%lu", name,
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(ulong) (*id_nr)++);
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} else {
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char table_name[MAX_TABLE_NAME_LEN + 21];
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uint errors = 0;
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strncpy(table_name, name, (sizeof table_name) - 1);
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table_name[(sizeof table_name) - 1] = '\0';
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innobase_convert_to_system_charset(
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strchr(table_name, '/') + 1,
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strchr(name, '/') + 1,
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MAX_TABLE_NAME_LEN, &errors);
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if (errors) {
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strncpy(table_name, name,
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(sizeof table_name) - 1);
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table_name[(sizeof table_name) - 1] = '\0';
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}
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/* no overflow if number < 1e13 */
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sprintf(id, "%s_ibfk_%lu", table_name,
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(ulong) (*id_nr)++);
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if (innobase_check_identifier_length(
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strchr(id,'/') + 1)) {
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DBUG_RETURN(DB_IDENTIFIER_TOO_LONG);
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}
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}
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foreign->id = id;
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DBUG_PRINT("dict_create_add_foreign_id",
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("generated foreign id: %s", id));
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}
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DBUG_RETURN(DB_SUCCESS);
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}
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/** Compose a column number for a virtual column, stored in the "POS" field
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of Sys_columns. The column number includes both its virtual column sequence
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(the "nth" virtual column) and its actual column position in original table
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@param[in] v_pos virtual column sequence
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@param[in] col_pos column position in original table definition
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@return composed column position number */
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UNIV_INLINE
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ulint
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dict_create_v_col_pos(
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ulint v_pos,
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ulint col_pos)
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{
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ut_ad(v_pos <= REC_MAX_N_FIELDS);
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ut_ad(col_pos <= REC_MAX_N_FIELDS);
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return(((v_pos + 1) << 16) + col_pos);
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}
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/** Get the column number for a virtual column (the column position in
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original table), stored in the "POS" field of Sys_columns
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@param[in] pos virtual column position
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@return column position in original table */
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UNIV_INLINE
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ulint
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dict_get_v_col_mysql_pos(
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ulint pos)
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{
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return(pos & 0xFFFF);
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}
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/** Get a virtual column sequence (the "nth" virtual column) for a
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virtual column, stord in the "POS" field of Sys_columns
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@param[in] pos virtual column position
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@return virtual column sequence */
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UNIV_INLINE
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ulint
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dict_get_v_col_pos(
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ulint pos)
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{
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return((pos >> 16) - 1);
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}
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