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557 lines
21 KiB
557 lines
21 KiB
14 years ago
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<?php
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/**
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* CDbSchema class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright Copyright © 2008-2011 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CDbSchema is the base class for retrieving metadata information.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @version $Id: CDbSchema.php 3359 2011-07-18 11:25:17Z qiang.xue $
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* @package system.db.schema
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* @since 1.0
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*/
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abstract class CDbSchema extends CComponent
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{
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/**
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* @var array the abstract column types mapped to physical column types.
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* @since 1.1.6
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*/
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public $columnTypes = array();
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private $_tableNames = array();
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private $_tables = array();
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private $_connection;
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private $_builder;
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private $_cacheExclude = array();
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/**
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* Loads the metadata for the specified table.
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* @param string $name table name
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* @return CDbTableSchema driver dependent table metadata, null if the table does not exist.
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*/
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abstract protected function loadTable($name);
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/**
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* Constructor.
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* @param CDbConnection $conn database connection.
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*/
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public function __construct($conn)
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{
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$this->_connection = $conn;
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foreach ($conn->schemaCachingExclude as $name)
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$this->_cacheExclude[$name] = true;
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}
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/**
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* @return CDbConnection database connection. The connection is active.
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*/
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public function getDbConnection()
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{
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return $this->_connection;
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}
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/**
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* Obtains the metadata for the named table.
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* @param string $name table name
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* @return CDbTableSchema table metadata. Null if the named table does not exist.
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*/
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public function getTable($name)
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{
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if (isset($this->_tables[$name]))
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return $this->_tables[$name];
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else
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{
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if ($this->_connection->tablePrefix !== null && strpos($name, '{{') !== false)
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$realName = preg_replace('/\{\{(.*?)\}\}/', $this->_connection->tablePrefix . '$1', $name);
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else
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$realName = $name;
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// temporarily disable query caching
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if ($this->_connection->queryCachingDuration > 0)
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{
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$qcDuration = $this->_connection->queryCachingDuration;
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$this->_connection->queryCachingDuration = 0;
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}
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if (!isset($this->_cacheExclude[$name]) && ($duration = $this->_connection->schemaCachingDuration) > 0 && $this->_connection->schemaCacheID !== false && ($cache = Yii::app()->getComponent($this->_connection->schemaCacheID)) !== null)
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{
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$key = 'yii:dbschema' . $this->_connection->connectionString . ':' . $this->_connection->username . ':' . $name;
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if (($table = $cache->get($key)) === false)
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{
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$table = $this->loadTable($realName);
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if ($table !== null)
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$cache->set($key, $table, $duration);
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}
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$this->_tables[$name] = $table;
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}
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else
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$this->_tables[$name] = $table = $this->loadTable($realName);
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if (isset($qcDuration)) // re-enable query caching
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$this->_connection->queryCachingDuration = $qcDuration;
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return $table;
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}
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}
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/**
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* Returns the metadata for all tables in the database.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* @return array the metadata for all tables in the database.
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* Each array element is an instance of {@link CDbTableSchema} (or its child class).
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* The array keys are table names.
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* @since 1.0.2
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*/
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public function getTables($schema = '')
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{
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$tables = array();
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foreach ($this->getTableNames($schema) as $name)
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{
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if (($table = $this->getTable($name)) !== null)
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$tables[$name] = $table;
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}
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return $tables;
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}
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/**
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* Returns all table names in the database.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* If not empty, the returned table names will be prefixed with the schema name.
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* @return array all table names in the database.
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* @since 1.0.2
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*/
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public function getTableNames($schema = '')
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{
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if (!isset($this->_tableNames[$schema]))
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$this->_tableNames[$schema] = $this->findTableNames($schema);
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return $this->_tableNames[$schema];
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}
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/**
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* @return CDbCommandBuilder the SQL command builder for this connection.
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*/
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public function getCommandBuilder()
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{
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if ($this->_builder !== null)
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return $this->_builder;
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else
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return $this->_builder = $this->createCommandBuilder();
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}
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/**
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* Refreshes the schema.
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* This method resets the loaded table metadata and command builder
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* so that they can be recreated to reflect the change of schema.
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*/
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public function refresh()
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{
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if (($duration = $this->_connection->schemaCachingDuration) > 0 && $this->_connection->schemaCacheID !== false && ($cache = Yii::app()->getComponent($this->_connection->schemaCacheID)) !== null)
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{
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foreach (array_keys($this->_tables) as $name)
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{
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if (!isset($this->_cacheExclude[$name]))
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{
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$key = 'yii:dbschema' . $this->_connection->connectionString . ':' . $this->_connection->username . ':' . $name;
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$cache->delete($key);
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}
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}
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}
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$this->_tables = array();
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$this->_tableNames = array();
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$this->_builder = null;
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}
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/**
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* Quotes a table name for use in a query.
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* If the table name contains schema prefix, the prefix will also be properly quoted.
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* @param string $name table name
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* @return string the properly quoted table name
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* @see quoteSimpleTableName
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*/
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public function quoteTableName($name)
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{
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if (strpos($name, '.') === false)
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return $this->quoteSimpleTableName($name);
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$parts = explode('.', $name);
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foreach ($parts as $i => $part)
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$parts[$i] = $this->quoteSimpleTableName($part);
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return implode('.', $parts);
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}
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/**
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* Quotes a simple table name for use in a query.
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* A simple table name does not schema prefix.
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* @param string $name table name
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* @return string the properly quoted table name
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* @since 1.1.6
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*/
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public function quoteSimpleTableName($name)
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{
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return "'" . $name . "'";
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}
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/**
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* Quotes a column name for use in a query.
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* If the column name contains prefix, the prefix will also be properly quoted.
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* @param string $name column name
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* @return string the properly quoted column name
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* @see quoteSimpleColumnName
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*/
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public function quoteColumnName($name)
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{
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if (($pos = strrpos($name, '.')) !== false)
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{
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$prefix = $this->quoteTableName(substr($name, 0, $pos)) . '.';
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$name = substr($name, $pos + 1);
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}
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else
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$prefix = '';
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return $prefix . ($name === '*' ? $name : $this->quoteSimpleColumnName($name));
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}
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/**
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* Quotes a simple column name for use in a query.
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* A simple column name does not contain prefix.
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* @param string $name column name
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* @return string the properly quoted column name
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* @since 1.1.6
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*/
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public function quoteSimpleColumnName($name)
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{
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return '"' . $name . '"';
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}
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/**
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* Compares two table names.
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* The table names can be either quoted or unquoted. This method
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* will consider both cases.
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* @param string $name1 table name 1
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* @param string $name2 table name 2
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* @return boolean whether the two table names refer to the same table.
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*/
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public function compareTableNames($name1, $name2)
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{
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$name1 = str_replace(array('"', '`', "'"), '', $name1);
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$name2 = str_replace(array('"', '`', "'"), '', $name2);
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if (($pos = strrpos($name1, '.')) !== false)
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$name1 = substr($name1, $pos + 1);
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if (($pos = strrpos($name2, '.')) !== false)
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$name2 = substr($name2, $pos + 1);
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if ($this->_connection->tablePrefix !== null)
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{
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if (strpos($name1, '{') !== false)
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$name1 = $this->_connection->tablePrefix . str_replace(array('{', '}'), '', $name1);
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if (strpos($name2, '{') !== false)
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$name2 = $this->_connection->tablePrefix . str_replace(array('{', '}'), '', $name2);
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}
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return $name1 === $name2;
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}
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/**
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* Resets 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 CDbTableSchema $table the table schema whose primary key sequence will be reset
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* @param mixed $value the value for the primary key of the next new row inserted. If this is not set,
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* the next new row's primary key will have a value 1.
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* @since 1.1
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*/
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public function resetSequence($table, $value = null)
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{
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}
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/**
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* Enables or disables integrity check.
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* @param boolean $check whether to turn on or off the integrity check.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* @since 1.1
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*/
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public function checkIntegrity($check = true, $schema = '')
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{
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}
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/**
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* Creates a command builder for the database.
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* This method may be overridden by child classes to create a DBMS-specific command builder.
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* @return CDbCommandBuilder command builder instance
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*/
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protected function createCommandBuilder()
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{
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return new CDbCommandBuilder($this);
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}
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/**
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* Returns all table names in the database.
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* This method should be overridden by child classes in order to support this feature
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* because the default implementation simply throws an exception.
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* @param string $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* If not empty, the returned table names will be prefixed with the schema name.
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* @return array all table names in the database.
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* @since 1.0.2
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*/
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protected function findTableNames($schema = '')
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{
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throw new CDbException(Yii::t('yii', '{class} does not support fetching all table names.',
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array('{class}' => get_class($this))));
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}
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/**
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* Converts an abstract column type into a physical column type.
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* The conversion is done using the type map specified in {@link columnTypes}.
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* These abstract column types are supported (using MySQL as example to explain the corresponding
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* physical types):
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* <ul>
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* <li>pk: an auto-incremental primary key type, will be converted into "int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY"</li>
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* <li>string: string type, will be converted into "varchar(255)"</li>
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* <li>text: a long string type, will be converted into "text"</li>
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* <li>integer: integer type, will be converted into "int(11)"</li>
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* <li>boolean: boolean type, will be converted into "tinyint(1)"</li>
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* <li>float: float number type, will be converted into "float"</li>
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* <li>decimal: decimal number type, will be converted into "decimal"</li>
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* <li>datetime: datetime type, will be converted into "datetime"</li>
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* <li>timestamp: timestamp type, will be converted into "timestamp"</li>
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* <li>time: time type, will be converted into "time"</li>
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* <li>date: date type, will be converted into "date"</li>
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* <li>binary: binary data type, will be converted into "blob"</li>
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* </ul>
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*
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* If the abstract type contains two or more parts separated by spaces (e.g. "string NOT NULL"), then only
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* the first part will be converted, and the rest of the parts will be appended to the conversion result.
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* For example, 'string NOT NULL' is converted to 'varchar(255) NOT NULL'.
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* @param string $type abstract column type
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* @return string physical column type.
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* @since 1.1.6
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*/
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public function getColumnType($type)
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{
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if (isset($this->columnTypes[$type]))
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return $this->columnTypes[$type];
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elseif (($pos = strpos($type, ' ')) !== false)
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{
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$t = substr($type, 0, $pos);
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return (isset($this->columnTypes[$t]) ? $this->columnTypes[$t] : $t) . substr($type, $pos);
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}
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else
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return $type;
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}
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/**
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* Builds a SQL statement for creating a new DB table.
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*
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* The columns in the new table should be specified as name-definition pairs (e.g. 'name'=>'string'),
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* where name stands for a column name which will be properly quoted by the method, and definition
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* stands for the column type which can contain an abstract DB type.
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* The {@link getColumnType} method will be invoked to convert any abstract type into a physical one.
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*
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* If a column is specified with definition only (e.g. 'PRIMARY KEY (name, type)'), it will be directly
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* inserted into the generated SQL.
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*
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* @param string $table the name of the table to be created. The name will be properly quoted by the method.
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* @param array $columns the columns (name=>definition) in the new table.
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* @param string $options additional SQL fragment that will be appended to the generated SQL.
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* @return string the SQL statement for creating a new DB table.
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* @since 1.1.6
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*/
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public function createTable($table, $columns, $options = null)
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{
|
||
|
|
$cols = array();
|
||
|
|
foreach ($columns as $name => $type)
|
||
|
|
{
|
||
|
|
if (is_string($name))
|
||
|
|
$cols[] = "\t" . $this->quoteColumnName($name) . ' ' . $this->getColumnType($type);
|
||
|
|
else
|
||
|
|
$cols[] = "\t" . $type;
|
||
|
|
}
|
||
|
|
$sql = "CREATE TABLE " . $this->quoteTableName($table) . " (\n" . implode(",\n", $cols) . "\n)";
|
||
|
|
return $options === null ? $sql : $sql . ' ' . $options;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for renaming a DB table.
|
||
|
|
* @param string $table the table to be renamed. The name will be properly quoted by the method.
|
||
|
|
* @param string $newName the new table name. The name will be properly quoted by the method.
|
||
|
|
* @return string the SQL statement for renaming a DB table.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function renameTable($table, $newName)
|
||
|
|
{
|
||
|
|
return 'RENAME TABLE ' . $this->quoteTableName($table) . ' TO ' . $this->quoteTableName($newName);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for dropping a DB table.
|
||
|
|
* @param string $table the table to be dropped. The name will be properly quoted by the method.
|
||
|
|
* @return string the SQL statement for dropping a DB table.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function dropTable($table)
|
||
|
|
{
|
||
|
|
return "DROP TABLE " . $this->quoteTableName($table);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for truncating a DB table.
|
||
|
|
* @param string $table the table to be truncated. The name will be properly quoted by the method.
|
||
|
|
* @return string the SQL statement for truncating a DB table.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function truncateTable($table)
|
||
|
|
{
|
||
|
|
return "TRUNCATE TABLE " . $this->quoteTableName($table);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for adding a new DB column.
|
||
|
|
* @param string $table the table that the new column will be added to. The table name will be properly quoted by the method.
|
||
|
|
* @param string $column the name of the new column. The name will be properly quoted by the method.
|
||
|
|
* @param string $type the column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
|
||
|
|
* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
|
||
|
|
* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
|
||
|
|
* @return string the SQL statement for adding a new column.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function addColumn($table, $column, $type)
|
||
|
|
{
|
||
|
|
return 'ALTER TABLE ' . $this->quoteTableName($table)
|
||
|
|
. ' ADD ' . $this->quoteColumnName($column) . ' '
|
||
|
|
. $this->getColumnType($type);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for dropping a DB column.
|
||
|
|
* @param string $table the table whose column is to be dropped. The name will be properly quoted by the method.
|
||
|
|
* @param string $column the name of the column to be dropped. The name will be properly quoted by the method.
|
||
|
|
* @return string the SQL statement for dropping a DB column.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function dropColumn($table, $column)
|
||
|
|
{
|
||
|
|
return "ALTER TABLE " . $this->quoteTableName($table)
|
||
|
|
. " DROP COLUMN " . $this->quoteColumnName($column);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 $name the old name of the column. The name will be properly quoted by the method.
|
||
|
|
* @param string $newName the new name of the column. The name will be properly quoted by the method.
|
||
|
|
* @return string the SQL statement for renaming a DB column.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function renameColumn($table, $name, $newName)
|
||
|
|
{
|
||
|
|
return "ALTER TABLE " . $this->quoteTableName($table)
|
||
|
|
. " RENAME COLUMN " . $this->quoteColumnName($name)
|
||
|
|
. " TO " . $this->quoteColumnName($newName);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for changing the definition of a column.
|
||
|
|
* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
|
||
|
|
* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
|
||
|
|
* @param string $type the new column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
|
||
|
|
* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
|
||
|
|
* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
|
||
|
|
* @return string the SQL statement for changing the definition of a column.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function alterColumn($table, $column, $type)
|
||
|
|
{
|
||
|
|
return 'ALTER TABLE ' . $this->quoteTableName($table) . ' CHANGE '
|
||
|
|
. $this->quoteColumnName($column) . ' '
|
||
|
|
. $this->quoteColumnName($column) . ' '
|
||
|
|
. $this->getColumnType($type);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for adding a foreign key constraint to an existing table.
|
||
|
|
* The method will properly quote the table and column names.
|
||
|
|
* @param string $name the name of the foreign key constraint.
|
||
|
|
* @param string $table the table that the foreign key constraint will be added to.
|
||
|
|
* @param string $columns the name of the column to that the constraint will be added on. If there are multiple columns, separate them with commas.
|
||
|
|
* @param string $refTable the table that the foreign key references to.
|
||
|
|
* @param string $refColumns the name of the column that the foreign key references to. If there are multiple columns, separate them with commas.
|
||
|
|
* @param string $delete the ON DELETE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
|
||
|
|
* @param string $update the ON UPDATE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
|
||
|
|
* @return string the SQL statement for adding a foreign key constraint to an existing table.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete = null, $update = null)
|
||
|
|
{
|
||
|
|
$columns = preg_split('/\s*,\s*/', $columns, -1, PREG_SPLIT_NO_EMPTY);
|
||
|
|
foreach ($columns as $i => $col)
|
||
|
|
$columns[$i] = $this->quoteColumnName($col);
|
||
|
|
$refColumns = preg_split('/\s*,\s*/', $refColumns, -1, PREG_SPLIT_NO_EMPTY);
|
||
|
|
foreach ($refColumns as $i => $col)
|
||
|
|
$refColumns[$i] = $this->quoteColumnName($col);
|
||
|
|
$sql = 'ALTER TABLE ' . $this->quoteTableName($table)
|
||
|
|
. ' ADD CONSTRAINT ' . $this->quoteColumnName($name)
|
||
|
|
. ' FOREIGN KEY (' . implode(', ', $columns) . ')'
|
||
|
|
. ' REFERENCES ' . $this->quoteTableName($refTable)
|
||
|
|
. ' (' . implode(', ', $refColumns) . ')';
|
||
|
|
if ($delete !== null)
|
||
|
|
$sql .= ' ON DELETE ' . $delete;
|
||
|
|
if ($update !== null)
|
||
|
|
$sql .= ' ON UPDATE ' . $update;
|
||
|
|
return $sql;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
|
||
|
|
* @return string the SQL statement for dropping a foreign key constraint.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function dropForeignKey($name, $table)
|
||
|
|
{
|
||
|
|
return 'ALTER TABLE ' . $this->quoteTableName($table)
|
||
|
|
. ' DROP CONSTRAINT ' . $this->quoteColumnName($name);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for creating a new index.
|
||
|
|
* @param string $name the name of the index. The name will be properly quoted by the method.
|
||
|
|
* @param string $table the table that the new index will be created for. The table name will be properly quoted by the method.
|
||
|
|
* @param string $column the column(s) that should be included in the index. If there are multiple columns, please separate them
|
||
|
|
* by commas. Each column name will be properly quoted by the method, unless a parenthesis is found in the name.
|
||
|
|
* @param boolean $unique whether to add UNIQUE constraint on the created index.
|
||
|
|
* @return string the SQL statement for creating a new index.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function createIndex($name, $table, $column, $unique = false)
|
||
|
|
{
|
||
|
|
$cols = array();
|
||
|
|
$columns = preg_split('/\s*,\s*/', $column, -1, PREG_SPLIT_NO_EMPTY);
|
||
|
|
foreach ($columns as $col)
|
||
|
|
{
|
||
|
|
if (strpos($col, '(') !== false)
|
||
|
|
$cols[] = $col;
|
||
|
|
else
|
||
|
|
$cols[] = $this->quoteColumnName($col);
|
||
|
|
}
|
||
|
|
return ($unique ? 'CREATE UNIQUE INDEX ' : 'CREATE INDEX ')
|
||
|
|
. $this->quoteTableName($name) . ' ON '
|
||
|
|
. $this->quoteTableName($table) . ' (' . implode(', ', $cols) . ')';
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Builds a SQL statement for dropping an index.
|
||
|
|
* @param string $name the name of the index to be dropped. The name will be properly quoted by the method.
|
||
|
|
* @param string $table the table whose index is to be dropped. The name will be properly quoted by the method.
|
||
|
|
* @return string the SQL statement for dropping an index.
|
||
|
|
* @since 1.1.6
|
||
|
|
*/
|
||
|
|
public function dropIndex($name, $table)
|
||
|
|
{
|
||
|
|
return 'DROP INDEX ' . $this->quoteTableName($name) . ' ON ' . $this->quoteTableName($table);
|
||
|
|
}
|
||
|
|
}
|