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<?php
/**
* TMysqlSchema class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
prado::using('System.Db.Schema.TDbSchema');
prado::using('System.Db.Schema.mysql.TMysqlTableSchema');
prado::using('System.Db.Schema.mysql.TMysqlColumnSchema');
/**
* TMysqlSchema is the class for retrieving metadata information from a MySQL database (version 4.1.x and 5.x).
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @version $Id: TMysqlSchema.php 2679 2009-06-15 07:49:42Z Christophe.Boulain $
* @package System.Db.Schema.mysql
* @since 1.0
*/
class TMysqlSchema extends TDbSchema
{
private $_tableNames;
private $_schemaNames;
/**
* Quotes a table name for use in a query.
* @param string table name
* @return string the properly quoted table name
*/
public function quoteTableName($name)
{
return '`'.$name.'`';
}
/**
* Quotes a column name for use in a query.
* @param string column name
* @return string the properly quoted column name
*/
public function quoteColumnName($name)
{
return '`'.$name.'`';
}
/**
* Compares two table names.
* The table names can be either quoted or unquoted. This method
* will consider both cases.
* @param string table name 1
* @param string table name 2
* @return boolean whether the two table names refer to the same table.
*/
public function compareTableNames($name1,$name2)
{
return parent::compareTableNames(strtolower($name1),strtolower($name2));
}
/**
* Creates a table instance representing the metadata for the named table.
* @return TMysqlTableSchema driver dependent table metadata. Null if the table does not exist.
*/
protected function createTable($name)
{
$table=new TMysqlTableSchema;
$this->resolveTableNames($table,$name);
if($this->findColumns($table))
{
$this->findConstraints($table);
return $table;
}
else
return null;
}
/**
* Generates various kinds of table names.
* @param TMysqlTableSchema the table instance
* @param string the unquoted table name
*/
protected function resolveTableNames($table,$name)
{
$parts=explode('.',str_replace('`','',$name));
if(isset($parts[1]))
{
$table->schemaName=$parts[0];
$table->name=$parts[1];
$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
}
else
{
$table->name=$parts[0];
$table->rawName=$this->quoteTableName($table->name);
}
}
/**
* Collects the table column metadata.
* @param TMysqlTableSchema the table metadata
* @return boolean whether the table exists in the database
*/
protected function findColumns($table)
{
$sql='SHOW COLUMNS FROM '.$table->rawName;
try
{
$columns=$this->getDbConnection()->createCommand($sql)->queryAll();
}
catch(Exception $e)
{
return false;
}
foreach($columns as $column)
{
$c=$this->createColumn($column);
$table->columns[$c->name]=$c;
if($c->isPrimaryKey)
{
if($table->primaryKey===null)
$table->primaryKey=$c->name;
else if(is_string($table->primaryKey))
$table->primaryKey=array($table->primaryKey,$c->name);
else
$table->primaryKey[]=$c->name;
if(strpos(strtolower($column['Extra']),'auto_increment')!==false)
$table->sequenceName='';
}
}
return true;
}
/**
* Creates a table column.
* @param array column metadata
* @return TDbColumnSchema normalized column metadata
*/
protected function createColumn($column)
{
$c=new TMysqlColumnSchema;
$c->name=$column['Field'];
$c->rawName=$this->quoteColumnName($c->name);
$c->allowNull=$column['Null']==='YES';
$c->isPrimaryKey=strpos($column['Key'],'PRI')!==false;
$c->isForeignKey=false;
$c->init($column['Type'],$column['Default']);
return $c;
}
/**
* @return float server version.
*/
protected function getServerVersion()
{
$version=$this->getDbConnection()->getAttribute(PDO::ATTR_SERVER_VERSION);
$digits=array();
preg_match('/(\d+)\.(\d+)\.(\d+)/', $version, $digits);
return floatval($digits[1].'.'.$digits[2].$digits[3]);
}
/**
* Collects the foreign key column details for the given table.
* @param TMysqlTableSchema the table metadata
*/
protected function findConstraints($table)
{
$row=$this->getDbConnection()->createCommand('SHOW CREATE TABLE '.$table->rawName)->queryRow();
$matches=array();
$regexp='/FOREIGN KEY\s+\(([^\)]+)\)\s+REFERENCES\s+([^\(^\s]+)\s*\(([^\)]+)\)/mi';
foreach($row as $sql)
{
if(preg_match_all($regexp,$sql,$matches,PREG_SET_ORDER))
break;
}
$foreign = array();
foreach($matches as $match)
{
$keys=array_map('trim',explode(',',str_replace('`','',$match[1])));
$fks=array_map('trim',explode(',',str_replace('`','',$match[3])));
foreach($keys as $k=>$name)
{
$table->foreignKeys[$name]=array(str_replace('`','',$match[2]),$fks[$k]);
if(isset($table->columns[$name]))
$table->columns[$name]->isForeignKey=true;
}
}
}
/**
* Returns all table names in the database.
* @return array all table names in the database.
* @since 1.0.2
*/
protected function findTableNames($schema='')
{
if($schema==='')
return $this->getDbConnection()->createCommand('SHOW TABLES')->queryColumn();
$names=$this->getDbConnection()->createCommand('SHOW TABLES FROM '.$this->quoteTableName($schema))->queryColumn();
foreach($names as &$name)
$name=$schema.'.'.$name;
return $names;
}
}
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