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<?php
/**
* CMssqlSchema class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Christophe Boulain <Christophe.Boulain@gmail.com>
* @link http://www.yiiframework.com/
* @copyright Copyright © 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CMssqlSchema is the class for retrieving metadata information from a MS SQL Server database.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @author Christophe Boulain <Christophe.Boulain@gmail.com>
* @version $Id: CMssqlSchema.php 1197 2009-06-30 23:31:52Z qiang.xue $
* @package system.db.schema.mssql
* @since 1.0.4
*/
class CMssqlSchema extends CDbSchema
{
const DEFAULT_SCHEMA='dbo';
/**
* Quotes a table name for use in a query.
* @param string table name
* @return string the properly quoted table name
*/
public function quoteTableName($name)
{
if (strpos($name,'.')===false)
return '['.$name.']';
$names=explode('.',$name);
foreach ($names as &$n)
$n = '['.$n.']';
return implode('.',$names);
}
/**
* Quotes a column name for use in a query.
* @param string column name
* @return string the properly quoted column name
*/
public function quoteColumnName($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)
{
$name1=str_replace(array('[',']'),'',$name1);
$name1=str_replace(array('[',']'),'',$name2);
return parent::compareTableNames(strtolower($name1),strtolower($name2));
}
/**
* Creates a table instance representing the metadata for the named table.
* @return CMssqlTableSchema driver dependent table metadata. Null if the table does not exist.
*/
protected function createTable($name)
{
$table=new CMssqlTableSchema;
$this->resolveTableNames($table,$name);
//if (!in_array($table->name, $this->tableNames)) return null;
$table->primaryKey=$this->findPrimaryKey($table);
$table->foreignKeys=$this->findForeignKeys($table);
if($this->findColumns($table))
{
return $table;
}
else
return null;
}
/**
* Generates various kinds of table names.
* @param CMssqlTableSchema the table instance
* @param string the unquoted table name
*/
protected function resolveTableNames($table,$name)
{
$parts=explode('.',str_replace(array('[',']'),'',$name));
if(($c=count($parts))==3)
{
// Catalog name, schema name and table name provided
$table->catalogName=$parts[0];
$table->schemaName=$parts[1];
$table->name=$parts[2];
$table->rawName=$this->quoteTableName($table->catalogName).'.'.$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
}
elseif ($c==2)
{
// Only schema name and table name provided
$table->name=$parts[1];
$table->schemaName=$parts[0];
$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
}
else
{
// Only the name given, we need to get at least the schema name
//if (empty($this->_schemaNames)) $this->findTableNames();
$table->name=$parts[0];
$table->schemaName=self::DEFAULT_SCHEMA;
$table->rawName=$this->quoteTableName($table->schemaName).'.'.$this->quoteTableName($table->name);
}
}
/**
* Gets the primary key column(s) details for the given table.
* @param CMssqlTableSchema table
* @return mixed primary keys (null if no pk, string if only 1 column pk, or array if composite pk)
*/
protected function findPrimaryKey($table)
{
$kcu='INFORMATION_SCHEMA.KEY_COLUMN_USAGE';
$tc='INFORMATION_SCHEMA.TABLE_CONSTRAINTS';
if (isset($table->catalogName))
{
$kcu=$table->catalogName.'.'.$kcu;
$tc=$table->catalogName.'.'.$tc;
}
$sql = <<<EOD
SELECT k.column_name field_name
FROM {$this->quoteTableName($kcu)} k
LEFT JOIN {$this->quoteTableName($tc)} c
ON k.table_name = c.table_name
AND k.constraint_name = c.constraint_name
WHERE c.constraint_type ='PRIMARY KEY'
AND k.table_name = :table
AND k.table_schema = :schema
EOD;
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':table', $table->name);
$command->bindValue(':schema', $table->schemaName);
$primary=$command->queryColumn();
switch (count($primary))
{
case 0: // No primary key on table
$primary=null;
break;
case 1: // Only 1 primary key
$primary=$primary[0];
break;
}
return $primary;
}
/**
* Gets foreign relationship constraint keys and table name
* @param CMssqlTableSchema table
* @return array foreign relationship table name and keys.
*/
protected function findForeignKeys($table)
{
$rc='INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS';
$kcu='INFORMATION_SCHEMA.KEY_COLUMN_USAGE';
if (isset($table->catalogName))
{
$kcu=$table->catalogName.'.'.$kcu;
$rc=$table->catalogName.'.'.$rc;
}
//From http://msdn2.microsoft.com/en-us/library/aa175805(SQL.80).aspx
$sql = <<<EOD
SELECT
KCU1.CONSTRAINT_NAME AS 'FK_CONSTRAINT_NAME'
, KCU1.TABLE_NAME AS 'FK_TABLE_NAME'
, KCU1.COLUMN_NAME AS 'FK_COLUMN_NAME'
, KCU1.ORDINAL_POSITION AS 'FK_ORDINAL_POSITION'
, KCU2.CONSTRAINT_NAME AS 'UQ_CONSTRAINT_NAME'
, KCU2.TABLE_NAME AS 'UQ_TABLE_NAME'
, KCU2.COLUMN_NAME AS 'UQ_COLUMN_NAME'
, KCU2.ORDINAL_POSITION AS 'UQ_ORDINAL_POSITION'
FROM {$this->quoteTableName($rc)} RC
JOIN {$this->quoteTableName($kcu)} KCU1
ON KCU1.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG
AND KCU1.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA
AND KCU1.CONSTRAINT_NAME = RC.CONSTRAINT_NAME
JOIN {$this->quoteTableName($kcu)} KCU2
ON KCU2.CONSTRAINT_CATALOG =
RC.UNIQUE_CONSTRAINT_CATALOG
AND KCU2.CONSTRAINT_SCHEMA =
RC.UNIQUE_CONSTRAINT_SCHEMA
AND KCU2.CONSTRAINT_NAME =
RC.UNIQUE_CONSTRAINT_NAME
AND KCU2.ORDINAL_POSITION = KCU1.ORDINAL_POSITION
WHERE KCU1.TABLE_NAME = :table
EOD;
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':table', $table->name);
$fkeys=array();
foreach($command->queryAll() as $info)
{
$fkeys[$info['FK_COLUMN_NAME']]=array($info['UQ_TABLE_NAME'],$info['UQ_COLUMN_NAME'],);
}
return $fkeys;
}
/**
* Collects the table column metadata.
* @param CMssqlTableSchema the table metadata
* @return boolean whether the table exists in the database
*/
protected function findColumns($table)
{
$where=array();
$where[]="TABLE_NAME='".$table->name."'";
if (isset($table->catalogName))
$where[]="TABLE_CATALOG='".$table->catalogName."'";
if (isset($table->schemaName))
$where[]="TABLE_SCHEMA='".$table->schemaName."'";
$sql="SELECT *, columnproperty(object_id(table_schema+'.'+table_name), column_name, 'IsIdentity') as IsIdentity ".
"FROM INFORMATION_SCHEMA.COLUMNS WHERE ".join(' AND ',$where);
if (($columns=$this->getDbConnection()->createCommand($sql)->queryAll())===array())
return false;
foreach($columns as $column)
{
$c=$this->createColumn($column);
if (is_array($table->primaryKey))
$c->isPrimaryKey=in_array($c->name, $table->primaryKey);
else
$c->isPrimaryKey=strcasecmp($c->name,$table->primaryKey)===0;
$c->isForeignKey=isset($table->foreignKeys[$c->name]);
$table->columns[$c->name]=$c;
if ($column['IsIdentity']==1 && $table->sequenceName===null)
$table->sequenceName='';
}
return true;
}
/**
* Creates a table column.
* @param array column metadata
* @return CDbColumnSchema normalized column metadata
*/
protected function createColumn($column)
{
$c=new CMssqlColumnSchema;
$c->name=$column['COLUMN_NAME'];
$c->rawName=$this->quoteColumnName($c->name);
$c->allowNull=$column['IS_NULLABLE']=='YES';
if ($column['NUMERIC_PRECISION_RADIX']!==null)
{
// We have a numeric datatype
$c->size=$c->precision=$column['NUMERIC_PRECISION']!==null?(int)$column['NUMERIC_PRECISION']:null;
$c->scale=$column['NUMERIC_SCALE']!==null?(int)$column['NUMERIC_SCALE']:null;
}
elseif ($column['DATA_TYPE']=='image' || $column['DATA_TYPE']=='text')
$c->size=$c->precision=null;
else
$c->size=$c->precision=($column['CHARACTER_MAXIMUM_LENGTH']!== null)?(int)$column['CHARACTER_MAXIMUM_LENGTH']:null;
$c->init($column['DATA_TYPE'],$column['COLUMN_DEFAULT']);
return $c;
}
/**
* Returns all table names in the database.
* @return array all table names in the database.
* @since 1.0.4
*/
protected function findTableNames($schema='')
{
if($schema==='')
$schema=self::DEFAULT_SCHEMA;
$sql=<<<EOD
SELECT TABLE_NAME, TABLE_SCHEMA FROM [INFORMATION_SCHEMA].[TABLES]
WHERE TABLE_TYPE='BASE TABLE' AND TABLE_SCHEMA=:schema
EOD;
$command=$this->getDbConnection()->createCommand($sql);
$command->bindParam(":schema", $schema);
$rows=$command->queryAll();
$names=array();
foreach ($rows as $row)
{
if ($schema == self::DEFAULT_SCHEMA)
$names[]=$row['TABLE_NAME'];
else
$names[]=$schema.'.'.$row['TABLE_SCHEMA'].'.'.$row['TABLE_NAME'];
}
return $names;
}
/**
* Creates a command builder for the database.
* This method overrides parent implementation in order to create a MSSQL specific command builder
* @return CDbCommandBuilder command builder instance
*/
protected function createCommandBuilder()
{
return new CMssqlCommandBuilder($this);
}
}