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<?php
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/*
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* $Id$
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This software consists of voluntary contributions made by many individuals
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* and is licensed under the LGPL. For more information, see
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* <http://www.phpdoctrine.org>.
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*/
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Doctrine::autoload('Doctrine_Connection_Module');
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/**
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* Doctrine_Expression_Driver
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*
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* @package Doctrine
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* @subpackage Expression
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @link www.phpdoctrine.org
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* @since 1.0
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* @version $Revision$
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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*/
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class Doctrine_Expression_Driver extends Doctrine_Connection_Module
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{
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public function getIdentifier($column)
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{
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return $column;
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}
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public function getIdentifiers($columns)
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{
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return $columns;
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}
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/**
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* regexp
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* returns the regular expression operator
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*
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* @return string
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*/
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public function regexp()
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{
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throw new Doctrine_Expression_Exception('Regular expression operator is not supported by this database driver.');
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}
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/**
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* Returns the average value of a column
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*
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* @param string $column the column to use
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* @return string generated sql including an AVG aggregate function
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*/
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public function avg($column)
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{
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$column = $this->getIdentifier($column);
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return 'AVG(' . $column . ')';
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}
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/**
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* Returns the number of rows (without a NULL value) of a column
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*
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* If a '*' is used instead of a column the number of selected rows
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* is returned.
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*
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* @param string|integer $column the column to use
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* @return string generated sql including a COUNT aggregate function
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*/
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public function count($column)
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{
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$column = $this->getIdentifier($column);
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return 'COUNT(' . $column . ')';
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}
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/**
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* Returns the highest value of a column
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*
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* @param string $column the column to use
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* @return string generated sql including a MAX aggregate function
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*/
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public function max($column)
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{
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$column = $this->getIdentifier($column);
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return 'MAX(' . $column . ')';
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}
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/**
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* Returns the lowest value of a column
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*
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* @param string $column the column to use
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* @return string
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*/
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public function min($column)
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{
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$column = $this->getIdentifier($column);
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return 'MIN(' . $column . ')';
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}
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/**
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* Returns the total sum of a column
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*
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* @param string $column the column to use
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* @return string
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*/
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public function sum($column)
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{
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$column = $this->getIdentifier($column);
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return 'SUM(' . $column . ')';
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}
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// scalar functions
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/**
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* Returns the md5 sum of a field.
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*
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* Note: Not SQL92, but common functionality
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*
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* @return string
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*/
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public function md5($column)
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{
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$column = $this->getIdentifier($column);
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return 'MD5(' . $column . ')';
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}
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/**
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* Returns the length of a text field.
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*
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* @param string $expression1
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* @param string $expression2
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* @return string
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*/
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public function length($column)
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{
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$column = $this->getIdentifier($column);
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return 'LENGTH(' . $column . ')';
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}
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/**
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* Rounds a numeric field to the number of decimals specified.
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*
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* @param string $expression1
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* @param string $expression2
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* @return string
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*/
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public function round($column, $decimals = 0)
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{
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$column = $this->getIdentifier($column);
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return 'ROUND(' . $column . ', ' . $decimals . ')';
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}
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/**
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* Returns the remainder of the division operation
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* $expression1 / $expression2.
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*
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* @param string $expression1
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* @param string $expression2
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* @return string
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*/
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public function mod($expression1, $expression2)
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{
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$expression1 = $this->getIdentifier($expression1);
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$expression2 = $this->getIdentifier($expression2);
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return 'MOD(' . $expression1 . ', ' . $expression2 . ')';
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}
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/**
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* trim
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* returns the string $str with leading and proceeding space characters removed
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*
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* @param string $str literal string or column name
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* @return string
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*/
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public function trim($str)
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{
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return 'TRIM(' . $str . ')';
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}
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/**
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* rtrim
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* returns the string $str with proceeding space characters removed
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*
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* @param string $str literal string or column name
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* @return string
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*/
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public function rtrim($str)
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{
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return 'RTRIM(' . $str . ')';
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}
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/**
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* ltrim
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* returns the string $str with leading space characters removed
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*
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* @param string $str literal string or column name
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* @return string
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*/
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public function ltrim($str)
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{
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return 'LTRIM(' . $str . ')';
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}
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/**
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* upper
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* Returns the string $str with all characters changed to
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* uppercase according to the current character set mapping.
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*
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* @param string $str literal string or column name
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* @return string
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*/
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public function upper($str)
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{
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return 'UPPER(' . $str . ')';
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}
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/**
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* lower
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* Returns the string $str with all characters changed to
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* lowercase according to the current character set mapping.
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*
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* @param string $str literal string or column name
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* @return string
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*/
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public function lower($str)
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{
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return 'LOWER(' . $str . ')';
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}
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/**
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* locate
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* returns the position of the first occurrence of substring $substr in string $str
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*
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* @param string $substr literal string to find
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* @param string $str literal string
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* @return integer
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*/
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public function locate($str, $substr)
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{
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return 'LOCATE(' . $str . ', ' . $substr . ')';
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}
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/**
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* Returns the current system date.
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*
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* @return string
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*/
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public function now()
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{
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return 'NOW()';
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}
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/**
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* soundex
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* Returns a string to call a function to compute the
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* soundex encoding of a string
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*
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* The string "?000" is returned if the argument is NULL.
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*
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* @param string $value
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* @return string SQL soundex function with given parameter
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*/
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public function soundex($value)
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{
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throw new Doctrine_Expression_Exception('SQL soundex function not supported by this driver.');
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}
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/**
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* return string to call a function to get a substring inside an SQL statement
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*
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* Note: Not SQL92, but common functionality.
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*
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* SQLite only supports the 2 parameter variant of this function
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*
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* @param string $value an sql string literal or column name/alias
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* @param integer $position where to start the substring portion
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* @param integer $length the substring portion length
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* @return string SQL substring function with given parameters
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*/
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public function substring($value, $from, $len = null)
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{
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$value = $this->getIdentifier($value);
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if ($len === null)
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return 'SUBSTRING(' . $value . ' FROM ' . $from . ')';
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else {
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$len = $this->getIdentifier($len);
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return 'SUBSTRING(' . $value . ' FROM ' . $from . ' FOR ' . $len . ')';
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}
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}
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/**
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* Returns a series of strings concatinated
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*
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* concat() accepts an arbitrary number of parameters. Each parameter
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* must contain an expression or an array with expressions.
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*
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* @param string|array(string) strings that will be concatinated.
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*/
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public function concat()
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{
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$args = func_get_args();
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return 'CONCAT(' . join(', ', (array) $args) . ')';
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}
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/**
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* Returns the SQL for a logical not.
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*
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* Example:
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* <code>
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* $q = new Doctrine_Query();
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* $e = $q->expr;
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* $q->select('*')->from('table')
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* ->where($e->eq('id', $e->not('null'));
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* </code>
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*
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* @return string a logical expression
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*/
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public function not($expression)
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{
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$expression = $this->getIdentifier($expression);
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return 'NOT(' . $expression . ')';
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}
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/**
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* Returns the SQL to perform the same mathematical operation over an array
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* of values or expressions.
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*
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* basicMath() accepts an arbitrary number of parameters. Each parameter
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* must contain a value or an expression or an array with values or
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* expressions.
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*
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* @param string $type the type of operation, can be '+', '-', '*' or '/'.
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* @param string|array(string)
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* @return string an expression
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*/
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private function basicMath($type, array $args)
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{
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$elements = $this->getIdentifiers($args);
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if (count($elements) < 1) {
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return '';
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}
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if (count($elements) == 1) {
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return $elements[0];
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} else {
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return '(' . implode(' ' . $type . ' ', $elements) . ')';
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}
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}
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/**
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* Returns the SQL to add values or expressions together.
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*
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* add() accepts an arbitrary number of parameters. Each parameter
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* must contain a value or an expression or an array with values or
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* expressions.
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*
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* Example:
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* <code>
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* $q = new Doctrine_Query();
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* $e = $q->expr;
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*
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* $q->select('u.*')
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* ->from('User u')
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* ->where($e->eq($e->add('id', 2), 12));
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* </code>
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*
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* @param string|array(string)
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* @return string an expression
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*/
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public function add(array $args)
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{
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return $this->basicMath('+', $args);
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}
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/**
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* Returns the SQL to subtract values or expressions from eachother.
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*
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* subtract() accepts an arbitrary number of parameters. Each parameter
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* must contain a value or an expression or an array with values or
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* expressions.
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*
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* Example:
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390 |
* <code>
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391 |
* $q = new Doctrine_Query();
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* $e = $q->expr;
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*
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* $q->select('u.*')
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* ->from('User u')
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* ->where($e->eq($e->sub('id', 2), 12));
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* </code>
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*
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* @param string|array(string)
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* @return string an expression
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*/
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public function sub(array $args)
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{
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return $this->basicMath('-', $args );
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}
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406 |
|
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/**
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* Returns the SQL to multiply values or expressions by eachother.
|
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*
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* multiply() accepts an arbitrary number of parameters. Each parameter
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* must contain a value or an expression or an array with values or
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* expressions.
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*
|
414 |
* Example:
|
415 |
* <code>
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416 |
* $q = new Doctrine_Query();
|
417 |
* $e = $q->expr;
|
418 |
*
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* $q->select('u.*')
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* ->from('User u')
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* ->where($e->eq($e->mul('id', 2), 12));
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* </code>
|
423 |
*
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424 |
* @param string|array(string)
|
425 |
* @return string an expression
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426 |
*/
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427 |
public function mul(array $args)
|
428 |
{
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return $this->basicMath('*', $args);
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}
|
431 |
|
432 |
/**
|
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* Returns the SQL to divide values or expressions by eachother.
|
434 |
*
|
435 |
* divide() accepts an arbitrary number of parameters. Each parameter
|
436 |
* must contain a value or an expression or an array with values or
|
437 |
* expressions.
|
438 |
*
|
439 |
* Example:
|
440 |
* <code>
|
441 |
* $q = new Doctrine_Query();
|
442 |
* $e = $q->expr;
|
443 |
*
|
444 |
* $q->select('u.*')
|
445 |
* ->from('User u')
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446 |
* ->where($e->eq($e->div('id', 2), 12));
|
447 |
* </code>
|
448 |
*
|
449 |
* @param string|array(string)
|
450 |
* @return string an expression
|
451 |
*/
|
452 |
public function div(array $args)
|
453 |
{
|
454 |
return $this->basicMath('/', $args);
|
455 |
}
|
456 |
|
457 |
/**
|
458 |
* Returns the SQL to check if two values are equal.
|
459 |
*
|
460 |
* Example:
|
461 |
* <code>
|
462 |
* $q = new Doctrine_Query();
|
463 |
* $q->select('u.*')
|
464 |
* ->from('User u')
|
465 |
* ->where($q->expr->eq('id', 1));
|
466 |
* </code>
|
467 |
*
|
468 |
* @param string $value1 logical expression to compare
|
469 |
* @param string $value2 logical expression to compare with
|
470 |
* @return string logical expression
|
471 |
*/
|
472 |
public function eq($value1, $value2)
|
473 |
{
|
474 |
$value1 = $this->getIdentifier($value1);
|
475 |
$value2 = $this->getIdentifier($value2);
|
476 |
return $value1 . ' = ' . $value2;
|
477 |
}
|
478 |
|
479 |
/**
|
480 |
* Returns the SQL to check if two values are unequal.
|
481 |
*
|
482 |
* Example:
|
483 |
* <code>
|
484 |
* $q = new Doctrine_Query();
|
485 |
* $q->select('u.*')
|
486 |
* ->from('User u')
|
487 |
* ->where($q->expr->neq('id', 1));
|
488 |
* </code>
|
489 |
*
|
490 |
* @param string $value1 logical expression to compare
|
491 |
* @param string $value2 logical expression to compare with
|
492 |
* @return string logical expression
|
493 |
*/
|
494 |
public function neq($value1, $value2)
|
495 |
{
|
496 |
$value1 = $this->getIdentifier($value1);
|
497 |
$value2 = $this->getIdentifier($value2);
|
498 |
return $value1 . ' <> ' . $value2;
|
499 |
}
|
500 |
|
501 |
/**
|
502 |
* Returns the SQL to check if one value is greater than another value.
|
503 |
*
|
504 |
* Example:
|
505 |
* <code>
|
506 |
* $q = new Doctrine_Query();
|
507 |
* $q->select('u.*')
|
508 |
* ->from('User u')
|
509 |
* ->where($q->expr->gt('id', 1));
|
510 |
* </code>
|
511 |
*
|
512 |
* @param string $value1 logical expression to compare
|
513 |
* @param string $value2 logical expression to compare with
|
514 |
* @return string logical expression
|
515 |
*/
|
516 |
public function gt($value1, $value2)
|
517 |
{
|
518 |
$value1 = $this->getIdentifier($value1);
|
519 |
$value2 = $this->getIdentifier($value2);
|
520 |
return $value1 . ' > ' . $value2;
|
521 |
}
|
522 |
|
523 |
/**
|
524 |
* Returns the SQL to check if one value is greater than or equal to
|
525 |
* another value.
|
526 |
*
|
527 |
* Example:
|
528 |
* <code>
|
529 |
* $q = new Doctrine_Query();
|
530 |
* $q->select('u.*')
|
531 |
* ->from('User u')
|
532 |
* ->where($q->expr->gte('id', 1));
|
533 |
* </code>
|
534 |
*
|
535 |
* @param string $value1 logical expression to compare
|
536 |
* @param string $value2 logical expression to compare with
|
537 |
* @return string logical expression
|
538 |
*/
|
539 |
public function gte($value1, $value2)
|
540 |
{
|
541 |
$value1 = $this->getIdentifier($value1);
|
542 |
$value2 = $this->getIdentifier($value2);
|
543 |
return $value1 . ' >= ' . $value2;
|
544 |
}
|
545 |
|
546 |
/**
|
547 |
* Returns the SQL to check if one value is less than another value.
|
548 |
*
|
549 |
* Example:
|
550 |
* <code>
|
551 |
* $q = new Doctrine_Query();
|
552 |
* $q->select('u.*')
|
553 |
* ->from('User u')
|
554 |
* ->where($q->expr->lt('id', 1));
|
555 |
* </code>
|
556 |
*
|
557 |
* @param string $value1 logical expression to compare
|
558 |
* @param string $value2 logical expression to compare with
|
559 |
* @return string logical expression
|
560 |
*/
|
561 |
public function lt($value1, $value2)
|
562 |
{
|
563 |
$value1 = $this->getIdentifier($value1);
|
564 |
$value2 = $this->getIdentifier($value2);
|
565 |
return $value1 . ' < ' . $value2;
|
566 |
}
|
567 |
|
568 |
/**
|
569 |
* Returns the SQL to check if one value is less than or equal to
|
570 |
* another value.
|
571 |
*
|
572 |
* Example:
|
573 |
* <code>
|
574 |
* $q = new Doctrine_Query();
|
575 |
* $q->select('u.*')
|
576 |
* ->from('User u')
|
577 |
* ->where($q->expr->lte('id', 1));
|
578 |
* </code>
|
579 |
*
|
580 |
* @param string $value1 logical expression to compare
|
581 |
* @param string $value2 logical expression to compare with
|
582 |
* @return string logical expression
|
583 |
*/
|
584 |
public function lte($value1, $value2)
|
585 |
{
|
586 |
$value1 = $this->getIdentifier($value1);
|
587 |
$value2 = $this->getIdentifier($value2);
|
588 |
return $value1 . ' <= ' . $value2;
|
589 |
}
|
590 |
|
591 |
/**
|
592 |
* Returns the SQL to check if a value is one in a set of
|
593 |
* given values..
|
594 |
*
|
595 |
* in() accepts an arbitrary number of parameters. The first parameter
|
596 |
* must always specify the value that should be matched against. Successive
|
597 |
* must contain a logical expression or an array with logical expressions.
|
598 |
* These expressions will be matched against the first parameter.
|
599 |
*
|
600 |
* Example:
|
601 |
* <code>
|
602 |
* $q = new Doctrine_Query();
|
603 |
* $q->select('u.*')
|
604 |
* ->from('User u')
|
605 |
* ->where($q->expr->in( 'id', array(1,2,3)));
|
606 |
* </code>
|
607 |
*
|
608 |
* @param string $column the value that should be matched against
|
609 |
* @param string|array(string) values that will be matched against $column
|
610 |
* @return string logical expression
|
611 |
*/
|
612 |
public function in($column, $values)
|
613 |
{
|
614 |
if ( ! is_array($values)) {
|
615 |
$values = array($values);
|
616 |
}
|
617 |
$values = $this->getIdentifiers($values);
|
618 |
$column = $this->getIdentifier($column);
|
619 |
|
620 |
if (count($values) == 0) {
|
621 |
throw new Doctrine_Expression_Exception('Values array for IN operator should not be empty.');
|
622 |
}
|
623 |
return $column . ' IN (' . implode(', ', $values) . ')';
|
624 |
}
|
625 |
|
626 |
/**
|
627 |
* Returns SQL that checks if a expression is null.
|
628 |
*
|
629 |
* Example:
|
630 |
* <code>
|
631 |
* $q = new Doctrine_Query();
|
632 |
* $q->select('u.*')
|
633 |
* ->from('User u')
|
634 |
* ->where($q->expr->isNull('id'));
|
635 |
* </code>
|
636 |
*
|
637 |
* @param string $expression the expression that should be compared to null
|
638 |
* @return string logical expression
|
639 |
*/
|
640 |
public function isNull($expression)
|
641 |
{
|
642 |
$expression = $this->getIdentifier($expression);
|
643 |
return $expression . ' IS NULL';
|
644 |
}
|
645 |
|
646 |
/**
|
647 |
* Returns SQL that checks if a expression is not null.
|
648 |
*
|
649 |
* Example:
|
650 |
* <code>
|
651 |
* $q = new Doctrine_Query();
|
652 |
* $q->select('u.*')
|
653 |
* ->from('User u')
|
654 |
* ->where($q->expr->isNotNull('id'));
|
655 |
* </code>
|
656 |
*
|
657 |
* @param string $expression the expression that should be compared to null
|
658 |
* @return string logical expression
|
659 |
*/
|
660 |
public function isNotNull($expression)
|
661 |
{
|
662 |
$expression = $this->getIdentifier($expression);
|
663 |
return $expression . ' IS NOT NULL';
|
664 |
}
|
665 |
|
666 |
/**
|
667 |
* Returns SQL that checks if an expression evaluates to a value between
|
668 |
* two values.
|
669 |
*
|
670 |
* The parameter $expression is checked if it is between $value1 and $value2.
|
671 |
*
|
672 |
* Note: There is a slight difference in the way BETWEEN works on some databases.
|
673 |
* http://www.w3schools.com/sql/sql_between.asp. If you want complete database
|
674 |
* independence you should avoid using between().
|
675 |
*
|
676 |
* Example:
|
677 |
* <code>
|
678 |
* $q = new Doctrine_Query();
|
679 |
* $q->select('u.*')
|
680 |
* ->from('User u')
|
681 |
* ->where($q->expr->between('id', 1, 5));
|
682 |
* </code>
|
683 |
*
|
684 |
* @param string $expression the value to compare to
|
685 |
* @param string $value1 the lower value to compare with
|
686 |
* @param string $value2 the higher value to compare with
|
687 |
* @return string logical expression
|
688 |
*/
|
689 |
public function between($expression, $value1, $value2)
|
690 |
{
|
691 |
$expression = $this->getIdentifier($expression);
|
692 |
$value1 = $this->getIdentifier($value1);
|
693 |
$value2 = $this->getIdentifier($value2);
|
694 |
return $expression . ' BETWEEN ' .$value1 . ' AND ' . $value2;
|
695 |
}
|
696 |
|
697 |
/**
|
698 |
* Returns global unique identifier
|
699 |
*
|
700 |
* @return string to get global unique identifier
|
701 |
*/
|
702 |
public function guid()
|
703 |
{
|
704 |
throw new Doctrine_Expression_Exception('method not implemented');
|
705 |
}
|
706 |
|
707 |
/**
|
708 |
* returns arcus cosine SQL string
|
709 |
*
|
710 |
* @return string
|
711 |
*/
|
712 |
public function acos($value)
|
713 |
{
|
714 |
return 'ACOS(' . $value . ')';
|
715 |
}
|
716 |
|
717 |
/**
|
718 |
* __call
|
719 |
*
|
720 |
* for all native RDBMS functions the function name itself is returned
|
721 |
*/
|
722 |
public function __call($m, $a)
|
723 |
{
|
724 |
if ($this->conn->getAttribute(Doctrine::ATTR_PORTABILITY) & Doctrine::PORTABILITY_EXPR) {
|
725 |
throw new Doctrine_Expression_Exception('Unknown expression ' . $m);
|
726 |
}
|
727 |
return $m . '(' . implode(', ', $a) . ')';
|
728 |
}
|
729 |
} |