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<?php
/**
* TMssqlMetaData class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2008 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id: TPgsqlMetaData.php 1866 2007-04-14 05:02:29Z wei $
* @package System.Data.Common.Pgsql
*/
/**
* Load the base TDbMetaData class.
*/
Prado::using('System.Data.Common.TDbMetaData');
Prado::using('System.Data.Common.Mssql.TMssqlTableInfo');
/**
* TMssqlMetaData loads MSSQL database table and column information.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id: TPgsqlMetaData.php 1866 2007-04-14 05:02:29Z wei $
* @package System.Data.Common.Mssql
* @since 3.1
*/
class TMssqlMetaData extends TDbMetaData
{
/**
* @return string TDbTableInfo class name.
*/
protected function getTableInfoClass()
{
return 'TMssqlTableInfo';
}
/**
* Get the column definitions for given table.
* @param string table name.
* @return TMssqlTableInfo table information.
*/
protected function createTableInfo($table)
{
list($catalogName,$schemaName,$tableName) = $this->getCatalogSchemaTableName($table);
$this->getDbConnection()->setActive(true);
$sql = <<<EOD
SELECT t.*,
c.*,
columnproperty(object_id(c.table_schema + '.' + c.table_name), c.column_name,'IsIdentity') as IsIdentity
FROM INFORMATION_SCHEMA.TABLES t,
INFORMATION_SCHEMA.COLUMNS c
WHERE t.table_name = c.table_name
AND t.table_name = :table
EOD;
if($schemaName!==null)
$sql .= ' AND t.table_schema = :schema';
if($catalogName!==null)
$sql .= ' AND t.table_catalog = :catalog';
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':table', $tableName);
if($schemaName!==null)
$command->bindValue(':schema', $schemaName);
if($catalogName!==null)
$command->bindValue(':catalog', $catalogName);
$tableInfo=null;
foreach($command->query() as $col)
{
if($tableInfo===null)
$tableInfo = $this->createNewTableInfo($col);
$this->processColumn($tableInfo,$col);
}
if($tableInfo===null)
throw new TDbException('dbmetadata_invalid_table_view', $table);
return $tableInfo;
}
/**
* @param string table name
* @return array tuple($catalogName,$schemaName,$tableName)
*/
protected function getCatalogSchemaTableName($table)
{
//remove possible delimiters
$result = explode('.', preg_replace('/\[|\]|"/', '', $table));
if(count($result)===1)
return array(null,null,$result[0]);
if(count($result)===2)
return array(null,$result[0],$result[1]);
if(count($result)>2)
return array($result[0],$result[1],$result[2]);
}
/**
* @param TMssqlTableInfo table information.
* @param array column information.
*/
protected function processColumn($tableInfo, $col)
{
$columnId = $col['COLUMN_NAME'];
$info['ColumnName'] = "[$columnId]"; //quote the column names!
$info['ColumnId'] = $columnId;
$info['ColumnIndex'] = intval($col['ORDINAL_POSITION'])-1; //zero-based index
if($col['IS_NULLABLE']!=='NO')
$info['AllowNull'] = true;
if($col['COLUMN_DEFAULT']!==null)
$info['DefaultValue'] = $col['COLUMN_DEFAULT'];
if(in_array($columnId, $tableInfo->getPrimaryKeys()))
$info['IsPrimaryKey'] = true;
if($this->isForeignKeyColumn($columnId, $tableInfo))
$info['IsForeignKey'] = true;
if($col['IsIdentity']==='1')
$info['AutoIncrement'] = true;
$info['DbType'] = $col['DATA_TYPE'];
if($col['CHARACTER_MAXIMUM_LENGTH']!==null)
$info['ColumnSize'] = intval($col['CHARACTER_MAXIMUM_LENGTH']);
if($col['NUMERIC_PRECISION'] !== null)
$info['NumericPrecision'] = intval($col['NUMERIC_PRECISION']);
if($col['NUMERIC_SCALE']!==null)
$info['NumericScale'] = intval($col['NUMERIC_SCALE']);
$tableInfo->Columns[$columnId] = new TMssqlTableColumn($info);
}
/**
* @param string table schema name
* @param string table name.
* @return TMssqlTableInfo
*/
protected function createNewTableInfo($col)
{
$info['CatalogName'] = $col['TABLE_CATALOG'];
$info['SchemaName'] = $col['TABLE_SCHEMA'];
$info['TableName'] = $col['TABLE_NAME'];
if($col['TABLE_TYPE']==='VIEW')
$info['IsView'] = true;
list($primary, $foreign) = $this->getConstraintKeys($col);
$class = $this->getTableInfoClass();
return new $class($info,$primary,$foreign);
}
/**
* Gets the primary and foreign key column details for the given table.
* @param string schema name
* @param string table name.
* @return array tuple ($primary, $foreign)
*/
protected function getConstraintKeys($col)
{
$sql = <<<EOD
SELECT k.column_name field_name
FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE k
LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS c
ON k.table_name = c.table_name
AND k.constraint_name = c.constraint_name
WHERE k.constraint_catalog = DB_NAME()
AND
c.constraint_type ='PRIMARY KEY'
AND k.table_name = :table
EOD;
$command = $this->getDbConnection()->createCommand($sql);
$command->bindValue(':table', $col['TABLE_NAME']);
$primary = array();
foreach($command->query()->readAll() as $field)
$primary[] = $field['field_name'];
$foreign = $this->getForeignConstraints($col);
return array($primary,$foreign);
}
/**
* Gets foreign relationship constraint keys and table name
* @param string database name
* @param string table name
* @return array foreign relationship table name and keys.
*/
protected function getForeignConstraints($col)
{
//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 INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC
JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE KCU1
ON KCU1.CONSTRAINT_CATALOG = RC.CONSTRAINT_CATALOG
AND KCU1.CONSTRAINT_SCHEMA = RC.CONSTRAINT_SCHEMA
AND KCU1.CONSTRAINT_NAME = RC.CONSTRAINT_NAME
JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE 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', $col['TABLE_NAME']);
$fkeys=array();
$catalogSchema = "[{$col['TABLE_CATALOG']}].[{$col['TABLE_SCHEMA']}]";
foreach($command->query() as $info)
{
$fkeys[$info['FK_CONSTRAINT_NAME']]['keys'][$info['FK_COLUMN_NAME']] = $info['UQ_COLUMN_NAME'];
$fkeys[$info['FK_CONSTRAINT_NAME']]['table'] = $info['UQ_TABLE_NAME'];
}
return count($fkeys) > 0 ? array_values($fkeys) : $fkeys;
}
/**
* @param string column name.
* @param TPgsqlTableInfo table information.
* @return boolean true if column is a foreign key.
*/
protected function isForeignKeyColumn($columnId, $tableInfo)
{
foreach($tableInfo->getForeignKeys() as $fk)
{
if(in_array($columnId, array_keys($fk['keys'])))
return true;
}
return false;
}
}
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