diff options
Diffstat (limited to 'framework/Db/schema/mssql/TMssqlCommandBuilder.php')
| -rwxr-xr-x | framework/Db/schema/mssql/TMssqlCommandBuilder.php | 303 |
1 files changed, 0 insertions, 303 deletions
diff --git a/framework/Db/schema/mssql/TMssqlCommandBuilder.php b/framework/Db/schema/mssql/TMssqlCommandBuilder.php deleted file mode 100755 index f3c68436..00000000 --- a/framework/Db/schema/mssql/TMssqlCommandBuilder.php +++ /dev/null @@ -1,303 +0,0 @@ -<?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 © 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; - } -} |