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https://github.com/moodle/moodle.git
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439 lines
19 KiB
PHP
439 lines
19 KiB
PHP
<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Mysql specific SQL code generator.
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*
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* @package core_ddl
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* @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
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* 2001-3001 Eloy Lafuente (stronk7) http://contiento.com
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->libdir.'/ddl/sql_generator.php');
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/**
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* This class generate SQL code to be used against MySQL
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* It extends XMLDBgenerator so everything can be
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* overridden as needed to generate correct SQL.
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*
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* @package core_ddl
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* @copyright 1999 onwards Martin Dougiamas http://dougiamas.com
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* 2001-3001 Eloy Lafuente (stronk7) http://contiento.com
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class mysql_sql_generator extends sql_generator {
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// Only set values that are different from the defaults present in XMLDBgenerator
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/** @var string Used to quote names. */
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public $quote_string = '`';
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/** @var string To define the default to set for NOT NULLs CHARs without default (null=do nothing).*/
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public $default_for_char = '';
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/** @var bool To specify if the generator must use some DEFAULT clause to drop defaults.*/
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public $drop_default_value_required = true;
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/** @var string The DEFAULT clause required to drop defaults.*/
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public $drop_default_value = null;
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/** @var string To force primary key names to one string (null=no force).*/
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public $primary_key_name = '';
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/** @var string Template to drop PKs. 'TABLENAME' and 'KEYNAME' will be replaced from this template.*/
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public $drop_primary_key = 'ALTER TABLE TABLENAME DROP PRIMARY KEY';
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/** @var string Template to drop UKs. 'TABLENAME' and 'KEYNAME' will be replaced from this template.*/
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public $drop_unique_key = 'ALTER TABLE TABLENAME DROP KEY KEYNAME';
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/** @var string Template to drop FKs. 'TABLENAME' and 'KEYNAME' will be replaced from this template.*/
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public $drop_foreign_key = 'ALTER TABLE TABLENAME DROP FOREIGN KEY KEYNAME';
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/** @var bool True if the generator needs to add extra code to generate the sequence fields.*/
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public $sequence_extra_code = false;
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/** @var string The particular name for inline sequences in this generator.*/
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public $sequence_name = 'auto_increment';
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public $add_after_clause = true; // Does the generator need to add the after clause for fields
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/** @var string Characters to be used as concatenation operator.*/
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public $concat_character = null;
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/** @var string The SQL template to alter columns where the 'TABLENAME' and 'COLUMNSPECS' keywords are dynamically replaced.*/
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public $alter_column_sql = 'ALTER TABLE TABLENAME MODIFY COLUMN COLUMNSPECS';
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/** @var string SQL sentence to drop one index where 'TABLENAME', 'INDEXNAME' keywords are dynamically replaced.*/
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public $drop_index_sql = 'ALTER TABLE TABLENAME DROP INDEX INDEXNAME';
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/** @var string SQL sentence to rename one index where 'TABLENAME', 'OLDINDEXNAME' and 'NEWINDEXNAME' are dynamically replaced.*/
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public $rename_index_sql = null;
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/** @var string SQL sentence to rename one key 'TABLENAME', 'OLDKEYNAME' and 'NEWKEYNAME' are dynamically replaced.*/
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public $rename_key_sql = null;
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/**
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* Reset a sequence to the id field of a table.
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*
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* @param xmldb_table|string $table name of table or the table object.
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* @return array of sql statements
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*/
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public function getResetSequenceSQL($table) {
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if ($table instanceof xmldb_table) {
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$tablename = $table->getName();
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} else {
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$tablename = $table;
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}
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// From http://dev.mysql.com/doc/refman/5.0/en/alter-table.html
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$value = (int)$this->mdb->get_field_sql('SELECT MAX(id) FROM {'.$tablename.'}');
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$value++;
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return array("ALTER TABLE $this->prefix$tablename AUTO_INCREMENT = $value");
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}
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/**
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* Given one correct xmldb_table, returns the SQL statements
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* to create it (inside one array).
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*
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* @param xmldb_table $xmldb_table An xmldb_table instance.
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* @return array An array of SQL statements, starting with the table creation SQL followed
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* by any of its comments, indexes and sequence creation SQL statements.
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*/
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public function getCreateTableSQL($xmldb_table) {
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// First find out if want some special db engine.
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$engine = $this->mdb->get_dbengine();
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// Do we know collation?
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$collation = $this->mdb->get_dbcollation();
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$sqlarr = parent::getCreateTableSQL($xmldb_table);
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// Let's inject the extra MySQL tweaks.
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foreach ($sqlarr as $i=>$sql) {
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if (strpos($sql, 'CREATE TABLE ') === 0) {
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if ($engine) {
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$sqlarr[$i] .= " ENGINE = $engine";
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}
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if ($collation) {
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if (strpos($collation, 'utf8_') === 0) {
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$sqlarr[$i] .= " DEFAULT CHARACTER SET utf8";
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}
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$sqlarr[$i] .= " DEFAULT COLLATE = $collation";
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}
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}
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}
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return $sqlarr;
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}
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/**
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* Given one correct xmldb_table, returns the SQL statements
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* to create temporary table (inside one array).
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*
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* @param xmldb_table $xmldb_table The xmldb_table object instance.
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* @return array of sql statements
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*/
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public function getCreateTempTableSQL($xmldb_table) {
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// Do we know collation?
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$collation = $this->mdb->get_dbcollation();
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$this->temptables->add_temptable($xmldb_table->getName());
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$sqlarr = parent::getCreateTableSQL($xmldb_table);
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// Let's inject the extra MySQL tweaks.
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foreach ($sqlarr as $i=>$sql) {
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if (strpos($sql, 'CREATE TABLE ') === 0) {
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// We do not want the engine hack included in create table SQL.
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$sqlarr[$i] = preg_replace('/^CREATE TABLE (.*)/s', 'CREATE TEMPORARY TABLE $1', $sql);
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if ($collation) {
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if (strpos($collation, 'utf8_') === 0) {
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$sqlarr[$i] .= " DEFAULT CHARACTER SET utf8";
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}
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$sqlarr[$i] .= " DEFAULT COLLATE $collation";
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}
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}
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}
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return $sqlarr;
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}
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/**
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* Given one correct xmldb_table, returns the SQL statements
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* to drop it (inside one array).
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*
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* @param xmldb_table $xmldb_table The table to drop.
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* @return array SQL statement(s) for dropping the specified table.
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*/
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public function getDropTableSQL($xmldb_table) {
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$sqlarr = parent::getDropTableSQL($xmldb_table);
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if ($this->temptables->is_temptable($xmldb_table->getName())) {
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$sqlarr = preg_replace('/^DROP TABLE/', "DROP TEMPORARY TABLE", $sqlarr);
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$this->temptables->delete_temptable($xmldb_table->getName());
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}
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return $sqlarr;
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}
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/**
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* Given one XMLDB Type, length and decimals, returns the DB proper SQL type.
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*
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* @param int $xmldb_type The xmldb_type defined constant. XMLDB_TYPE_INTEGER and other XMLDB_TYPE_* constants.
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* @param int $xmldb_length The length of that data type.
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* @param int $xmldb_decimals The decimal places of precision of the data type.
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* @return string The DB defined data type.
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*/
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public function getTypeSQL($xmldb_type, $xmldb_length=null, $xmldb_decimals=null) {
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switch ($xmldb_type) {
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case XMLDB_TYPE_INTEGER: // From http://mysql.com/doc/refman/5.0/en/numeric-types.html!
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if (empty($xmldb_length)) {
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$xmldb_length = 10;
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}
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if ($xmldb_length > 9) {
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$dbtype = 'BIGINT';
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} else if ($xmldb_length > 6) {
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$dbtype = 'INT';
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} else if ($xmldb_length > 4) {
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$dbtype = 'MEDIUMINT';
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} else if ($xmldb_length > 2) {
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$dbtype = 'SMALLINT';
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} else {
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$dbtype = 'TINYINT';
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}
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$dbtype .= '(' . $xmldb_length . ')';
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break;
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case XMLDB_TYPE_NUMBER:
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$dbtype = $this->number_type;
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if (!empty($xmldb_length)) {
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$dbtype .= '(' . $xmldb_length;
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if (!empty($xmldb_decimals)) {
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$dbtype .= ',' . $xmldb_decimals;
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}
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$dbtype .= ')';
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}
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break;
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case XMLDB_TYPE_FLOAT:
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$dbtype = 'DOUBLE';
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if (!empty($xmldb_decimals)) {
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if ($xmldb_decimals < 6) {
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$dbtype = 'FLOAT';
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}
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}
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if (!empty($xmldb_length)) {
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$dbtype .= '(' . $xmldb_length;
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if (!empty($xmldb_decimals)) {
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$dbtype .= ',' . $xmldb_decimals;
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} else {
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$dbtype .= ', 0'; // In MySQL, if length is specified, decimals are mandatory for FLOATs
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}
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$dbtype .= ')';
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}
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break;
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case XMLDB_TYPE_CHAR:
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$dbtype = 'VARCHAR';
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if (empty($xmldb_length)) {
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$xmldb_length='255';
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}
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$dbtype .= '(' . $xmldb_length . ')';
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if ($collation = $this->mdb->get_dbcollation()) {
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if (strpos($collation, 'utf8_') === 0) {
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$dbtype .= " CHARACTER SET utf8";
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}
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$dbtype .= " COLLATE $collation";
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}
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break;
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case XMLDB_TYPE_TEXT:
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$dbtype = 'LONGTEXT';
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if ($collation = $this->mdb->get_dbcollation()) {
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if (strpos($collation, 'utf8_') === 0) {
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$dbtype .= " CHARACTER SET utf8";
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}
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$dbtype .= " COLLATE $collation";
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}
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break;
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case XMLDB_TYPE_BINARY:
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$dbtype = 'LONGBLOB';
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break;
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case XMLDB_TYPE_DATETIME:
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$dbtype = 'DATETIME';
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}
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return $dbtype;
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}
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/**
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* Given one xmldb_table and one xmldb_field, return the SQL statements needed to add its default
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* (usually invoked from getModifyDefaultSQL()
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*
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* @param xmldb_table $xmldb_table The xmldb_table object instance.
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* @param xmldb_field $xmldb_field The xmldb_field object instance.
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* @return array Array of SQL statements to create a field's default.
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*/
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public function getCreateDefaultSQL($xmldb_table, $xmldb_field) {
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// Just a wrapper over the getAlterFieldSQL() function for MySQL that
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// is capable of handling defaults
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return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
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}
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/**
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* Given one correct xmldb_field and the new name, returns the SQL statements
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* to rename it (inside one array).
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*
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* @param xmldb_table $xmldb_table The table related to $xmldb_field.
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* @param xmldb_field $xmldb_field The instance of xmldb_field to get the renamed field from.
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* @param string $newname The new name to rename the field to.
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* @return array The SQL statements for renaming the field.
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*/
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public function getRenameFieldSQL($xmldb_table, $xmldb_field, $newname) {
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// NOTE: MySQL is pretty different from the standard to justify this overloading.
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// Need a clone of xmldb_field to perform the change leaving original unmodified
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$xmldb_field_clone = clone($xmldb_field);
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// Change the name of the field to perform the change
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$xmldb_field_clone->setName($newname);
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$fieldsql = $this->getFieldSQL($xmldb_table, $xmldb_field_clone);
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$sql = 'ALTER TABLE ' . $this->getTableName($xmldb_table) . ' CHANGE ' .
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$xmldb_field->getName() . ' ' . $fieldsql;
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return array($sql);
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}
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/**
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* Given one xmldb_table and one xmldb_field, return the SQL statements needed to drop its default
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* (usually invoked from getModifyDefaultSQL()
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*
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* Note that this method may be dropped in future.
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*
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* @param xmldb_table $xmldb_table The xmldb_table object instance.
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* @param xmldb_field $xmldb_field The xmldb_field object instance.
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* @return array Array of SQL statements to create a field's default.
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*
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* @todo MDL-31147 Moodle 2.1 - Drop getDropDefaultSQL()
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*/
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public function getDropDefaultSQL($xmldb_table, $xmldb_field) {
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// Just a wrapper over the getAlterFieldSQL() function for MySQL that
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// is capable of handling defaults
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return $this->getAlterFieldSQL($xmldb_table, $xmldb_field);
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}
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/**
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* Returns the code (array of statements) needed to add one comment to the table.
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*
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* @param xmldb_table $xmldb_table The xmldb_table object instance.
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* @return array Array of SQL statements to add one comment to the table.
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*/
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function getCommentSQL ($xmldb_table) {
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$comment = '';
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if ($xmldb_table->getComment()) {
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$comment .= 'ALTER TABLE ' . $this->getTableName($xmldb_table);
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$comment .= " COMMENT='" . $this->addslashes(substr($xmldb_table->getComment(), 0, 60)) . "'";
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}
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return array($comment);
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}
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/**
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* Given one object name and it's type (pk, uk, fk, ck, ix, uix, seq, trg).
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*
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* (MySQL requires the whole xmldb_table object to be specified, so we add it always)
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*
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* This is invoked from getNameForObject().
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* Only some DB have this implemented.
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*
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* @param string $object_name The object's name to check for.
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* @param string $type The object's type (pk, uk, fk, ck, ix, uix, seq, trg).
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* @param string $table_name The table's name to check in
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* @return bool If such name is currently in use (true) or no (false)
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*/
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public function isNameInUse($object_name, $type, $table_name) {
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switch($type) {
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case 'ix':
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case 'uix':
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// First of all, check table exists
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$metatables = $this->mdb->get_tables();
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if (isset($metatables[$table_name])) {
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// Fetch all the indexes in the table
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if ($indexes = $this->mdb->get_indexes($table_name)) {
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// Look for existing index in array
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if (isset($indexes[$object_name])) {
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return true;
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}
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}
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}
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break;
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}
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return false; //No name in use found
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}
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/**
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* Returns an array of reserved words (lowercase) for this DB
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* @return array An array of database specific reserved words
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*/
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public static function getReservedWords() {
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// This file contains the reserved words for MySQL databases
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// from http://dev.mysql.com/doc/refman/6.0/en/reserved-words.html
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$reserved_words = array (
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'accessible', 'add', 'all', 'alter', 'analyze', 'and', 'as', 'asc',
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'asensitive', 'before', 'between', 'bigint', 'binary',
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'blob', 'both', 'by', 'call', 'cascade', 'case', 'change',
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'char', 'character', 'check', 'collate', 'column',
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'condition', 'connection', 'constraint', 'continue',
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'convert', 'create', 'cross', 'current_date', 'current_time',
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'current_timestamp', 'current_user', 'cursor', 'database',
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'databases', 'day_hour', 'day_microsecond',
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'day_minute', 'day_second', 'dec', 'decimal', 'declare',
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'default', 'delayed', 'delete', 'desc', 'describe',
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'deterministic', 'distinct', 'distinctrow', 'div', 'double',
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'drop', 'dual', 'each', 'else', 'elseif', 'enclosed', 'escaped',
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'exists', 'exit', 'explain', 'false', 'fetch', 'float', 'float4',
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'float8', 'for', 'force', 'foreign', 'from', 'fulltext', 'grant',
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'group', 'having', 'high_priority', 'hour_microsecond',
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'hour_minute', 'hour_second', 'if', 'ignore', 'in', 'index',
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'infile', 'inner', 'inout', 'insensitive', 'insert', 'int', 'int1',
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'int2', 'int3', 'int4', 'int8', 'integer', 'interval', 'into', 'is',
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'iterate', 'join', 'key', 'keys', 'kill', 'leading', 'leave', 'left',
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'like', 'limit', 'linear', 'lines', 'load', 'localtime', 'localtimestamp',
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'lock', 'long', 'longblob', 'longtext', 'loop', 'low_priority', 'master_heartbeat_period',
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'master_ssl_verify_server_cert', 'match', 'mediumblob', 'mediumint', 'mediumtext',
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'middleint', 'minute_microsecond', 'minute_second',
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'mod', 'modifies', 'natural', 'not', 'no_write_to_binlog',
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'null', 'numeric', 'on', 'optimize', 'option', 'optionally',
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'or', 'order', 'out', 'outer', 'outfile', 'overwrite', 'precision', 'primary',
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'procedure', 'purge', 'raid0', 'range', 'read', 'read_only', 'read_write', 'reads', 'real',
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'references', 'regexp', 'release', 'rename', 'repeat', 'replace',
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'require', 'restrict', 'return', 'revoke', 'right', 'rlike', 'schema',
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'schemas', 'second_microsecond', 'select', 'sensitive',
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'separator', 'set', 'show', 'smallint', 'soname', 'spatial',
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'specific', 'sql', 'sqlexception', 'sqlstate', 'sqlwarning',
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'sql_big_result', 'sql_calc_found_rows', 'sql_small_result',
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'ssl', 'starting', 'straight_join', 'table', 'terminated', 'then',
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'tinyblob', 'tinyint', 'tinytext', 'to', 'trailing', 'trigger', 'true',
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'undo', 'union', 'unique', 'unlock', 'unsigned', 'update',
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'upgrade', 'usage', 'use', 'using', 'utc_date', 'utc_time',
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'utc_timestamp', 'values', 'varbinary', 'varchar', 'varcharacter',
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'varying', 'when', 'where', 'while', 'with', 'write', 'x509',
|
|
'xor', 'year_month', 'zerofill'
|
|
);
|
|
return $reserved_words;
|
|
}
|
|
}
|