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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\db\mysql;
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use yii\db\Exception;
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use yii\base\InvalidParamException;
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/**
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* QueryBuilder is the query builder for MySQL databases.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class QueryBuilder extends \yii\db\QueryBuilder
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{
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/**
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* @var array mapping from abstract column types (keys) to physical column types (values).
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*/
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public $typeMap = array(
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Schema::TYPE_PK => 'int(11) not null auto_increment primary key',
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Schema::TYPE_STRING => 'varchar(255)',
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Schema::TYPE_TEXT => 'text',
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Schema::TYPE_SMALLINT => 'smallint(6)',
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Schema::TYPE_INTEGER => 'int(11)',
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Schema::TYPE_BIGINT => 'bigint(20)',
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Schema::TYPE_FLOAT => 'float',
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Schema::TYPE_DECIMAL => 'decimal(10,0)',
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Schema::TYPE_DATETIME => 'datetime',
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Schema::TYPE_TIMESTAMP => 'timestamp',
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Schema::TYPE_TIME => 'time',
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Schema::TYPE_DATE => 'date',
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Schema::TYPE_BINARY => 'blob',
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Schema::TYPE_BOOLEAN => 'tinyint(1)',
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Schema::TYPE_MONEY => 'decimal(19,4)',
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);
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/**
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* Builds a SQL statement for renaming a column.
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* @param string $table the table whose column is to be renamed. The name will be properly quoted by the method.
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* @param string $oldName the old name of the column. The name will be properly quoted by the method.
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* @param string $newName the new name of the column. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB column.
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* @throws Exception
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*/
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public function renameColumn($table, $oldName, $newName)
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{
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$quotedTable = $this->db->quoteTableName($table);
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$row = $this->db->createCommand('SHOW CREATE TABLE ' . $quotedTable)->queryOne();
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if ($row === false) {
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throw new Exception("Unable to find column '$oldName' in table '$table'.");
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}
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if (isset($row['Create Table'])) {
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$sql = $row['Create Table'];
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} else {
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$row = array_values($row);
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$sql = $row[1];
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}
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if (preg_match_all('/^\s*`(.*?)`\s+(.*?),?$/m', $sql, $matches)) {
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foreach ($matches[1] as $i => $c) {
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if ($c === $oldName) {
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return "ALTER TABLE $quotedTable CHANGE "
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. $this->db->quoteColumnName($oldName) . ' '
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. $this->db->quoteColumnName($newName) . ' '
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. $matches[2][$i];
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}
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}
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}
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// try to give back a SQL anyway
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return "ALTER TABLE $quotedTable CHANGE "
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. $this->db->quoteColumnName($oldName) . ' '
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. $this->db->quoteColumnName($newName);
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}
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/**
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* Builds a SQL statement for dropping a foreign key constraint.
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* @param string $name the name of the foreign key constraint to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a foreign key constraint.
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*/
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public function dropForeignKey($name, $table)
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{
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return 'ALTER TABLE ' . $this->db->quoteTableName($table)
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. ' DROP FOREIGN KEY ' . $this->db->quoteColumnName($name);
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}
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/**
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* Builds a SQL statement for removing a primary key constraint to an existing table.
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* @param string $name the name of the primary key constraint to be removed.
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* @param string $table the table that the primary key constraint will be removed from.
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* @return string the SQL statement for removing a primary key constraint from an existing table.
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*/
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public function dropPrimaryKey($name, $table)
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{
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return 'ALTER TABLE ' . $this->db->quoteTableName($table) . ' DROP PRIMARY KEY';
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}
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/**
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* Creates a SQL statement for resetting the sequence value of a table's primary key.
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* The sequence will be reset such that the primary key of the next new row inserted
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* will have the specified value or 1.
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* @param string $tableName the name of the table whose primary key sequence will be reset
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* @param mixed $value the value for the primary key of the next new row inserted. If this is not set,
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* the next new row's primary key will have a value 1.
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* @return string the SQL statement for resetting sequence
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* @throws InvalidParamException if the table does not exist or there is no sequence associated with the table.
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*/
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public function resetSequence($tableName, $value = null)
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{
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$table = $this->db->getTableSchema($tableName);
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if ($table !== null && $table->sequenceName !== null) {
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$tableName = $this->db->quoteTableName($tableName);
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if ($value === null) {
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$key = reset($table->primaryKey);
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$value = $this->db->createCommand("SELECT MAX(`$key`) FROM $tableName")->queryScalar() + 1;
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} else {
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$value = (int)$value;
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}
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return "ALTER TABLE $tableName AUTO_INCREMENT=$value";
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} elseif ($table === null) {
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throw new InvalidParamException("Table not found: $tableName");
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} else {
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throw new InvalidParamException("There is not sequence associated with table '$tableName'.");
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}
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}
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/**
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* Builds a SQL statement for enabling or disabling integrity check.
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* @param boolean $check whether to turn on or off the integrity check.
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* @param string $table the table name. Meaningless for MySQL.
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* @param string $schema the schema of the tables. Meaningless for MySQL.
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* @return string the SQL statement for checking integrity
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*/
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public function checkIntegrity($check = true, $schema = '', $table = '')
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{
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return 'SET FOREIGN_KEY_CHECKS = ' . ($check ? 1 : 0);
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}
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/**
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* Generates a batch INSERT SQL statement.
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* For example,
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*
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* ~~~
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* $connection->createCommand()->batchInsert('tbl_user', array('name', 'age'), array(
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* array('Tom', 30),
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* array('Jane', 20),
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* array('Linda', 25),
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* ))->execute();
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* ~~~
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*
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* Note that the values in each row must match the corresponding column names.
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*
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* @param string $table the table that new rows will be inserted into.
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* @param array $columns the column names
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* @param array $rows the rows to be batch inserted into the table
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* @return string the batch INSERT SQL statement
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*/
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public function batchInsert($table, $columns, $rows)
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{
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if (($tableSchema = $this->db->getTableSchema($table)) !== null) {
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$columnSchemas = $tableSchema->columns;
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} else {
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$columnSchemas = array();
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}
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foreach ($columns as $i => $name) {
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$columns[$i] = $this->db->quoteColumnName($name);
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}
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$values = array();
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foreach ($rows as $row) {
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$vs = array();
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foreach ($row as $i => $value) {
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if (!is_array($value) && isset($columnSchemas[$columns[$i]])) {
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$value = $columnSchemas[$columns[$i]]->typecast($value);
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}
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$vs[] = is_string($value) ? $this->db->quoteValue($value) : $value;
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}
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$values[] = '(' . implode(', ', $vs) . ')';
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}
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return 'INSERT INTO ' . $this->db->quoteTableName($table)
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. ' (' . implode(', ', $columns) . ') VALUES ' . implode(', ', $values);
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}
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}
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