<?php /** * @link http://www.yiiframework.com/ * @copyright Copyright (c) 2008 Yii Software LLC * @license http://www.yiiframework.com/license/ */ namespace yii\db\mysql; use yii\db\Exception; use yii\base\InvalidParamException; /** * QueryBuilder is the query builder for MySQL databases. * * @author Qiang Xue <qiang.xue@gmail.com> * @since 2.0 */ class QueryBuilder extends \yii\db\QueryBuilder { /** * @var array mapping from abstract column types (keys) to physical column types (values). */ public $typeMap = [ Schema::TYPE_PK => 'int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY', Schema::TYPE_BIGPK => 'bigint(20) NOT NULL AUTO_INCREMENT PRIMARY KEY', Schema::TYPE_STRING => 'varchar(255)', Schema::TYPE_TEXT => 'text', Schema::TYPE_SMALLINT => 'smallint(6)', Schema::TYPE_INTEGER => 'int(11)', Schema::TYPE_BIGINT => 'bigint(20)', Schema::TYPE_FLOAT => 'float', Schema::TYPE_DECIMAL => 'decimal(10,0)', Schema::TYPE_DATETIME => 'datetime', Schema::TYPE_TIMESTAMP => 'timestamp', Schema::TYPE_TIME => 'time', Schema::TYPE_DATE => 'date', Schema::TYPE_BINARY => 'blob', Schema::TYPE_BOOLEAN => 'tinyint(1)', Schema::TYPE_MONEY => 'decimal(19,4)', ]; /** * Builds a SQL statement for renaming a column. * @param string $table the table whose column is to be renamed. The name will be properly quoted by the method. * @param string $oldName the old name of the column. The name will be properly quoted by the method. * @param string $newName the new name of the column. The name will be properly quoted by the method. * @return string the SQL statement for renaming a DB column. * @throws Exception */ public function renameColumn($table, $oldName, $newName) { $quotedTable = $this->db->quoteTableName($table); $row = $this->db->createCommand('SHOW CREATE TABLE ' . $quotedTable)->queryOne(); if ($row === false) { throw new Exception("Unable to find column '$oldName' in table '$table'."); } if (isset($row['Create Table'])) { $sql = $row['Create Table']; } else { $row = array_values($row); $sql = $row[1]; } if (preg_match_all('/^\s*`(.*?)`\s+(.*?),?$/m', $sql, $matches)) { foreach ($matches[1] as $i => $c) { if ($c === $oldName) { return "ALTER TABLE $quotedTable CHANGE " . $this->db->quoteColumnName($oldName) . ' ' . $this->db->quoteColumnName($newName) . ' ' . $matches[2][$i]; } } } // try to give back a SQL anyway return "ALTER TABLE $quotedTable CHANGE " . $this->db->quoteColumnName($oldName) . ' ' . $this->db->quoteColumnName($newName); } /** * Builds a SQL statement for dropping a foreign key constraint. * @param string $name the name of the foreign key constraint to be dropped. The name will be properly quoted by the method. * @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method. * @return string the SQL statement for dropping a foreign key constraint. */ public function dropForeignKey($name, $table) { return 'ALTER TABLE ' . $this->db->quoteTableName($table) . ' DROP FOREIGN KEY ' . $this->db->quoteColumnName($name); } /** * Builds a SQL statement for removing a primary key constraint to an existing table. * @param string $name the name of the primary key constraint to be removed. * @param string $table the table that the primary key constraint will be removed from. * @return string the SQL statement for removing a primary key constraint from an existing table. */ public function dropPrimaryKey($name, $table) { return 'ALTER TABLE ' . $this->db->quoteTableName($table) . ' DROP PRIMARY KEY'; } /** * Creates a SQL statement for resetting the sequence value of a table's primary key. * The sequence will be reset such that the primary key of the next new row inserted * will have the specified value or 1. * @param string $tableName the name of the table whose primary key sequence will be reset * @param mixed $value the value for the primary key of the next new row inserted. If this is not set, * the next new row's primary key will have a value 1. * @return string the SQL statement for resetting sequence * @throws InvalidParamException if the table does not exist or there is no sequence associated with the table. */ public function resetSequence($tableName, $value = null) { $table = $this->db->getTableSchema($tableName); if ($table !== null && $table->sequenceName !== null) { $tableName = $this->db->quoteTableName($tableName); if ($value === null) { $key = reset($table->primaryKey); $value = $this->db->createCommand("SELECT MAX(`$key`) FROM $tableName")->queryScalar() + 1; } else { $value = (int)$value; } return "ALTER TABLE $tableName AUTO_INCREMENT=$value"; } elseif ($table === null) { throw new InvalidParamException("Table not found: $tableName"); } else { throw new InvalidParamException("There is not sequence associated with table '$tableName'."); } } /** * Builds a SQL statement for enabling or disabling integrity check. * @param boolean $check whether to turn on or off the integrity check. * @param string $table the table name. Meaningless for MySQL. * @param string $schema the schema of the tables. Meaningless for MySQL. * @return string the SQL statement for checking integrity */ public function checkIntegrity($check = true, $schema = '', $table = '') { return 'SET FOREIGN_KEY_CHECKS = ' . ($check ? 1 : 0); } }