598 lines
23 KiB
PHP
598 lines
23 KiB
PHP
<?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 2008-2013 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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* @property CDbConnection $dbConnection Database connection. The connection is active.
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* @property array $tables 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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* @property array $tableNames All table names in the database.
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* @property CDbCommandBuilder $commandBuilder The SQL command builder for this connection.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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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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* @param boolean $refresh if we need to refresh schema cache for a table.
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* Parameter available since 1.1.9
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* @return CDbTableSchema table metadata. Null if the named table does not exist.
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*/
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public function getTable($name,$refresh=false)
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{
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if($refresh===false && 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.':'.$name;
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$table=$cache->get($key);
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if($refresh===true || $table===false)
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{
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$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 $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* @return array the metadata for all tables in the database.
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* Each array element is an instance of {@link CDbTableSchema} (or its child class).
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* The array keys are table names.
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*/
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public function getTables($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 $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* If not empty, the returned table names will be prefixed with the schema name.
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* @return array all table names in the database.
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*/
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public function getTableNames($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 max value of a primary key plus one (i.e. sequence trimming).
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* @param CDbTableSchema $table the table schema whose primary key sequence will be reset
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* @param integer|null $value the value for the primary key of the next new row inserted.
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* If this is not set, the next new row's primary key will have the max value of a primary
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* key plus one (i.e. sequence trimming).
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* @since 1.1
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*/
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public function resetSequence($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 $schema the schema of the tables. Defaults to empty string, meaning the current or default schema.
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* If not empty, the returned table names will be prefixed with the schema name.
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* @throws CDbException if current schema does not support fetching all table names
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* @return array all table names in the database.
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*/
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protected function findTableNames($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, $options=null)
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{
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$cols=array();
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foreach($columns as $name=>$type)
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{
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if(is_string($name))
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$cols[]="\t".$this->quoteColumnName($name).' '.$this->getColumnType($type);
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else
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$cols[]="\t".$type;
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}
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$sql="CREATE TABLE ".$this->quoteTableName($table)." (\n".implode(",\n",$cols)."\n)";
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return $options===null ? $sql : $sql.' '.$options;
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}
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/**
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* Builds a SQL statement for renaming a DB table.
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* @param string $table the table to be renamed. The name will be properly quoted by the method.
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* @param string $newName the new table name. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB table.
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* @since 1.1.6
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*/
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public function renameTable($table, $newName)
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{
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return 'RENAME TABLE ' . $this->quoteTableName($table) . ' TO ' . $this->quoteTableName($newName);
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}
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/**
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* Builds a SQL statement for dropping a DB table.
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* @param string $table the table to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a DB table.
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* @since 1.1.6
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*/
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public function dropTable($table)
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{
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return "DROP TABLE ".$this->quoteTableName($table);
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}
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/**
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* Builds a SQL statement for truncating a DB table.
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* @param string $table the table to be truncated. The name will be properly quoted by the method.
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* @return string the SQL statement for truncating a DB table.
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* @since 1.1.6
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*/
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public function truncateTable($table)
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{
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return "TRUNCATE TABLE ".$this->quoteTableName($table);
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}
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/**
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* Builds a SQL statement for adding a new DB column.
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* @param string $table the table that the new column will be added to. The table name will be properly quoted by the method.
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* @param string $column the name of the new column. The name will be properly quoted by the method.
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* @param string $type the column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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* @return string the SQL statement for adding a new column.
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* @since 1.1.6
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*/
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public function addColumn($table, $column, $type)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table)
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. ' ADD ' . $this->quoteColumnName($column) . ' '
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. $this->getColumnType($type);
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}
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/**
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* Builds a SQL statement for dropping a DB column.
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* @param string $table the table whose column is to be dropped. The name will be properly quoted by the method.
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* @param string $column the name of the column to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a DB column.
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* @since 1.1.6
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*/
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public function dropColumn($table, $column)
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{
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return "ALTER TABLE ".$this->quoteTableName($table)
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." DROP COLUMN ".$this->quoteColumnName($column);
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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 $name the old name of the column. The name will be properly quoted by the method.
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* @param string $newName the new name of the column. The name will be properly quoted by the method.
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* @return string the SQL statement for renaming a DB column.
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* @since 1.1.6
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*/
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public function renameColumn($table, $name, $newName)
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{
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return "ALTER TABLE ".$this->quoteTableName($table)
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. " RENAME COLUMN ".$this->quoteColumnName($name)
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. " TO ".$this->quoteColumnName($newName);
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}
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/**
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* Builds a SQL statement for changing the definition of a column.
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* @param string $table the table whose column is to be changed. The table name will be properly quoted by the method.
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* @param string $column the name of the column to be changed. The name will be properly quoted by the method.
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* @param string $type the new column type. The {@link getColumnType} method will be invoked to convert abstract column type (if any)
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* into the physical one. Anything that is not recognized as abstract type will be kept in the generated SQL.
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* For example, 'string' will be turned into 'varchar(255)', while 'string not null' will become 'varchar(255) not null'.
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* @return string the SQL statement for changing the definition of a column.
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* @since 1.1.6
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*/
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public function alterColumn($table, $column, $type)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table) . ' CHANGE '
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. $this->quoteColumnName($column) . ' '
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. $this->quoteColumnName($column) . ' '
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. $this->getColumnType($type);
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}
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/**
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* Builds a SQL statement for adding a foreign key constraint to an existing table.
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* The method will properly quote the table and column names.
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* @param string $name the name of the foreign key constraint.
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* @param string $table the table that the foreign key constraint will be added to.
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* @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.
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* @param string $refTable the table that the foreign key references to.
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* @param string $refColumns the name of the column that the foreign key references to. If there are multiple columns, separate them with commas.
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* @param string $delete the ON DELETE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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* @param string $update the ON UPDATE option. Most DBMS support these options: RESTRICT, CASCADE, NO ACTION, SET DEFAULT, SET NULL
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* @return string the SQL statement for adding a foreign key constraint to an existing table.
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* @since 1.1.6
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*/
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public function addForeignKey($name, $table, $columns, $refTable, $refColumns, $delete=null, $update=null)
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{
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$columns=preg_split('/\s*,\s*/',$columns,-1,PREG_SPLIT_NO_EMPTY);
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foreach($columns as $i=>$col)
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$columns[$i]=$this->quoteColumnName($col);
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$refColumns=preg_split('/\s*,\s*/',$refColumns,-1,PREG_SPLIT_NO_EMPTY);
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foreach($refColumns as $i=>$col)
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$refColumns[$i]=$this->quoteColumnName($col);
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$sql='ALTER TABLE '.$this->quoteTableName($table)
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.' ADD CONSTRAINT '.$this->quoteColumnName($name)
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.' FOREIGN KEY ('.implode(', ', $columns).')'
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.' REFERENCES '.$this->quoteTableName($refTable)
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.' ('.implode(', ', $refColumns).')';
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if($delete!==null)
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$sql.=' ON DELETE '.$delete;
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if($update!==null)
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$sql.=' ON UPDATE '.$update;
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return $sql;
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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 $table the table whose foreign is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping a foreign key constraint.
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* @since 1.1.6
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*/
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public function dropForeignKey($name, $table)
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{
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return 'ALTER TABLE '.$this->quoteTableName($table)
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.' DROP CONSTRAINT '.$this->quoteColumnName($name);
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}
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/**
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* Builds a SQL statement for creating a new index.
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* @param string $name the name of the index. The name will be properly quoted by the method.
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* @param string $table the table that the new index will be created for. The table name will be properly quoted by the method.
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* @param string $column the column(s) that should be included in the index. If there are multiple columns, please separate them
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* by commas. Each column name will be properly quoted by the method, unless a parenthesis is found in the name.
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* @param boolean $unique whether to add UNIQUE constraint on the created index.
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* @return string the SQL statement for creating a new index.
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* @since 1.1.6
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*/
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public function createIndex($name, $table, $column, $unique=false)
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{
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$cols=array();
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$columns=preg_split('/\s*,\s*/',$column,-1,PREG_SPLIT_NO_EMPTY);
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foreach($columns as $col)
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{
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if(strpos($col,'(')!==false)
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$cols[]=$col;
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else
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$cols[]=$this->quoteColumnName($col);
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}
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return ($unique ? 'CREATE UNIQUE INDEX ' : 'CREATE INDEX ')
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. $this->quoteTableName($name).' ON '
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. $this->quoteTableName($table).' ('.implode(', ',$cols).')';
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}
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/**
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* Builds a SQL statement for dropping an index.
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* @param string $name the name of the index to be dropped. The name will be properly quoted by the method.
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* @param string $table the table whose index is to be dropped. The name will be properly quoted by the method.
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* @return string the SQL statement for dropping an index.
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* @since 1.1.6
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*/
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public function dropIndex($name, $table)
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{
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return 'DROP INDEX '.$this->quoteTableName($name).' ON '.$this->quoteTableName($table);
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}
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/**
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* Builds a SQL statement for adding a primary key constraint to an existing table.
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* @param string $name the name of the primary key constraint.
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* @param string $table the table that the primary key constraint will be added to.
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* @param string|array $columns comma separated string or array of columns that the primary key will consist of.
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* Array value can be passed since 1.1.14.
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* @return string the SQL statement for adding a primary key constraint to an existing table.
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* @since 1.1.13
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*/
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public function addPrimaryKey($name,$table,$columns)
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{
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if(is_string($columns))
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$columns=preg_split('/\s*,\s*/',$columns,-1,PREG_SPLIT_NO_EMPTY);
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foreach($columns as $i=>$col)
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$columns[$i]=$this->quoteColumnName($col);
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return 'ALTER TABLE ' . $this->quoteTableName($table) . ' ADD CONSTRAINT '
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. $this->quoteColumnName($name) . ' PRIMARY KEY ('
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. implode(', ', $columns). ' )';
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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 $table the table that the primary key constraint will be removed from.
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* @return string the SQL statement for removing a primary key constraint from an existing table.
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* @since 1.1.13
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*/
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public function dropPrimaryKey($name,$table)
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{
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return 'ALTER TABLE ' . $this->quoteTableName($table) . ' DROP CONSTRAINT '
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. $this->quoteColumnName($name);
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}
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}
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