Primilary import of new db stuff

1 files changed, 303 insertions, 0 deletions

diff --git a/framework/Db/schema/mssql/TMssqlCommandBuilder.php b/framework/Db/schema/mssql/TMssqlCommandBuilder.php
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+<?php
+/**
+ * CMsCommandBuilder class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+prado::using ('System.db.schame.TDbCommandBuilder');
+
+/**
+ * TMssqlCommandBuilder provides basic methods to create query commands for tables for Mssql Servers.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @author Christophe Boulain <Christophe.Boulain@gmail.com>
+ * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+ * @version $Id$
+ * @package system.db.schema.mssql
+ * @since 1.0.4
+ */
+class TMssqlCommandBuilder extends TDbCommandBuilder
+{
+   	/**
+	 * Returns the last insertion ID for the specified table.
+	 * Override parent implemantation since PDO mssql driver does not provide this method
+	 * @param TDbTableSchema the table metadata
+	 * @return mixed last insertion id. Null is returned if no sequence name.
+	 */
+	public function getLastInsertID($table)
+	{
+		if($table->sequenceName!==null)
+			return $this->getDbConnection()->createCommand('SELECT SCOPE_IDENTITY()')->queryScalar();
+		else
+			return null;
+	}
+
+	/**
+	 * Creates a COUNT(*) command for a single table.
+	 * Override parent implementation to remove the order clause of criteria if it exists
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand query command.
+	 */
+	public function createCountCommand($table,$criteria)
+	{
+		$criteria->order='';
+		return parent::createCountCommand($table, $criteria);
+	}
+
+	/**
+	 * Creates a SELECT command for a single table.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand query command.
+	 */
+	public function createFindCommand($table,$criteria)
+	{
+		$criteria=$this->checkCriteria($table,$criteria);
+		return parent::createFindCommand($table,$criteria);
+
+	}
+
+	/**
+	 * Creates an UPDATE command.
+	 * Override parent implementation because mssql don't want to update an identity column
+	 * @param TDbTableSchema the table metadata
+	 * @param array list of columns to be updated (name=>value)
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand update command.
+	 */
+	public function createUpdateCommand($table,$data,$criteria)
+	{
+		$criteria=$this->checkCriteria($table,$criteria);
+		$fields=array();
+		$values=array();
+		$bindByPosition=isset($criteria->params[0]);
+		foreach($data as $name=>$value)
+		{
+			if(($column=$table->getColumn($name))!==null)
+			{
+				if ($table->sequenceName !== null && $column->isPrimaryKey === true) continue;
+				if($value instanceof TDbExpression)
+					$fields[]=$column->rawName.'='.(string)$value;
+				else if($bindByPosition)
+				{
+					$fields[]=$column->rawName.'=?';
+					$values[]=$column->typecast($value);
+				}
+				else
+				{
+					$fields[]=$column->rawName.'=:'.$name;
+					$values[':'.$name]=$column->typecast($value);
+				}
+			}
+		}
+		if($fields===array())
+			throw new TDbException('No columns are being updated for table "{0}".',
+				$table->name);
+		$sql="UPDATE {$table->rawName} SET ".implode(', ',$fields);
+		$sql=$this->applyJoin($sql,$criteria->join);
+		$sql=$this->applyCondition($sql,$criteria->condition);
+		$sql=$this->applyOrder($sql,$criteria->order);
+		$sql=$this->applyLimit($sql,$criteria->limit,$criteria->offset);
+
+		$command=$this->getDbConnection()->createCommand($sql);
+		$this->bindValues($command,array_merge($values,$criteria->params));
+
+		return $command;
+	}
+
+	/**
+	 * Creates a DELETE command.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @return TDbCommand delete command.
+	 */
+	public function createDeleteCommand($table,$criteria)
+	{
+		$criteria=$this->checkCriteria($table, $criteria);
+		return parent::createDeleteCommand($table, $criteria);
+	}
+
+	/**
+	 * Creates an UPDATE command that increments/decrements certain columns.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * @param TDbTableSchema the table metadata
+	 * @param TDbCriteria the query criteria
+	 * @param array counters to be updated (counter increments/decrements indexed by column names.)
+	 * @return TDbCommand the created command
+	 * @throws CException if no counter is specified
+	 */
+	public function createUpdateCounterCommand($table,$counters,$criteria)
+	{
+		$criteria=$this->checkCriteria($table, $criteria);
+		return parent::createUpdateCounterCommand($table, $counters, $criteria);
+	}
+
+	/**
+	 * This is a port from Prado Framework.
+	 *
+	 * Overrides parent implementation. Alters the sql to apply $limit and $offset.
+	 * The idea for limit with offset is done by modifying the sql on the fly
+	 * with numerous assumptions on the structure of the sql string.
+	 * The modification is done with reference to the notes from
+	 * http://troels.arvin.dk/db/rdbms/#select-limit-offset
+	 *
+	 * <code>
+	 * SELECT * FROM (
+	 *  SELECT TOP n * FROM (
+	 *    SELECT TOP z columns      -- (z=n+skip)
+	 *    FROM tablename
+	 *    ORDER BY key ASC
+	 *  ) AS FOO ORDER BY key DESC -- ('FOO' may be anything)
+	 * ) AS BAR ORDER BY key ASC    -- ('BAR' may be anything)
+	 * </code>
+	 *
+	 * <b>Regular expressions are used to alter the SQL query. The resulting SQL query
+	 * may be malformed for complex queries.</b> The following restrictions apply
+	 *
+	 * <ul>
+	 *   <li>
+	 * In particular, <b>commas</b> should <b>NOT</b>
+	 * be used as part of the ordering expression or identifier. Commas must only be
+	 * used for separating the ordering clauses.
+	 *  </li>
+	 *  <li>
+	 * In the ORDER BY clause, the column name should NOT be be qualified
+	 * with a table name or view name. Alias the column names or use column index.
+	 * </li>
+	 * <li>
+	 * No clauses should follow the ORDER BY clause, e.g. no COMPUTE or FOR clauses.
+	 * </li>
+	 *
+	 * @param string SQL query string.
+	 * @param integer maximum number of rows, -1 to ignore limit.
+	 * @param integer row offset, -1 to ignore offset.
+	 * @return string SQL with limit and offset.
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	public function applyLimit($sql, $limit, $offset)
+	{
+		$limit = $limit!==null ? intval($limit) : -1;
+		$offset = $offset!==null ? intval($offset) : -1;
+		if ($limit > 0 && $offset <= 0) //just limit
+			$sql = preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',"\\1SELECT\\2 TOP $limit", $sql);
+		else if($limit > 0 && $offset > 0)
+			$sql = $this->rewriteLimitOffsetSql($sql, $limit,$offset);
+		return $sql;
+	}
+
+	/**
+	 * Rewrite sql to apply $limit > and $offset > 0 for MSSQL database.
+	 * See http://troels.arvin.dk/db/rdbms/#select-limit-offset
+	 * @param string sql query
+	 * @param integer $limit > 0
+	 * @param integer $offset > 0
+	 * @return sql modified sql query applied with limit and offset.
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function rewriteLimitOffsetSql($sql, $limit, $offset)
+	{
+		$fetch = $limit+$offset;
+		$sql = preg_replace('/^([\s(])*SELECT( DISTINCT)?(?!\s*TOP\s*\()/i',"\\1SELECT\\2 TOP $fetch", $sql);
+		$ordering = $this->findOrdering($sql);
+
+		$orginalOrdering = $this->joinOrdering($ordering);
+		$reverseOrdering = $this->joinOrdering($this->reverseDirection($ordering));
+		$sql = "SELECT * FROM (SELECT TOP {$limit} * FROM ($sql) as [__inner top table__] {$reverseOrdering}) as [__outer top table__] {$orginalOrdering}";
+		return $sql;
+	}
+
+	/**
+	 * Base on simplified syntax http://msdn2.microsoft.com/en-us/library/aa259187(SQL.80).aspx
+	 *
+	 * @param string $sql
+	 * @return array ordering expression as key and ordering direction as value
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function findOrdering($sql)
+	{
+		if(!preg_match('/ORDER BY/i', $sql))
+			return array();
+		$matches=array();
+		$ordering=array();
+		preg_match_all('/(ORDER BY)[\s"\[](.*)(ASC|DESC)?(?:[\s"\[]|$|COMPUTE|FOR)/i', $sql, $matches);
+		if(count($matches)>1 && count($matches[2]) > 0)
+		{
+			$parts = explode(',', $matches[2][0]);
+			foreach($parts as $part)
+			{
+				$subs=array();
+				if(preg_match_all('/(.*)[\s"\]](ASC|DESC)$/i', trim($part), $subs))
+				{
+					if(count($subs) > 1 && count($subs[2]) > 0)
+					{
+						$ordering[$subs[1][0]] = $subs[2][0];
+					}
+					//else what?
+				}
+				else
+					$ordering[trim($part)] = 'ASC';
+			}
+		}
+		return $ordering;
+	}
+
+	/**
+	 * @param array ordering obtained from findOrdering()
+	 * @return string concat the orderings
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function joinOrdering($orders)
+	{
+		if(count($orders)>0)
+		{
+			$str=array();
+			foreach($orders as $column => $direction)
+				$str[] = $column.' '.$direction;
+			return 'ORDER BY '.implode(', ', $str);
+		}
+	}
+
+	/**
+	 * @param array original ordering
+	 * @return array ordering with reversed direction.
+	 *
+	 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>
+	 */
+	protected function reverseDirection($orders)
+	{
+		foreach($orders as $column => $direction)
+			$orders[$column] = strtolower(trim($direction))==='desc' ? 'ASC' : 'DESC';
+		return $orders;
+	}
+
+
+	/**
+	 * Checks if the criteria has an order by clause when using offset/limit.
+	 * Override parent implementation to check if an orderby clause if specified when querying with an offset
+	 * If not, order it by pk.
+	 * @param TMssqlTableSchema table schema
+	 * @param TDbCriteria criteria
+	 * @return TDbCrireria the modified criteria
+	 */
+	protected function checkCriteria($table, $criteria)
+	{
+		if ($criteria->offset > 0 && $criteria->order==='')
+		{
+			$criteria->order=is_array($table->primaryKey)?implode(',',$table->primaryKey):$table->primaryKey;
+		}
+		return $criteria;
+	}
+}