656 lines
20 KiB
PHP
656 lines
20 KiB
PHP
<?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.com>.
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*/
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Doctrine::autoload('Doctrine_Connection_Module');
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/**
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* Doctrine_Expression
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*
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* @package Doctrine
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* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
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* @category Object Relational Mapping
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* @link www.phpdoctrine.com
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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 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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* 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 ' . $len . ')';
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}
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}
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/**
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* Returns a series of strings concatinated
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*
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* concat() accepts an arbitrary number of parameters. Each parameter
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* must contain an expression or an array with expressions.
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*
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* @param string|array(string) strings that will be concatinated.
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*/
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public function concat($args)
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{
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$cols = $this->getIdentifiers($args);
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return 'CONCAT(' . join(', ', (array) $cols) . ')';
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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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* <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->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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/**
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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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*
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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->mul('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 mul(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 divide values or expressions by eachother.
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*
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* divide() 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->div('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 div(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 check if two values are equal.
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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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* $q->select('u.*')
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* ->from('User u')
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* ->where($q->expr->eq('id', 1));
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* </code>
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*
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* @param string $value1 logical expression to compare
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* @param string $value2 logical expression to compare with
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* @return string logical expression
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*/
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public function eq($value1, $value2)
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{
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$value1 = $this->getIdentifier($value1);
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$value2 = $this->getIdentifier($value2);
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return $value1 . ' = ' . $value2;
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}
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/**
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* Returns the SQL to check if two values are unequal.
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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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* $q->select('u.*')
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* ->from('User u')
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* ->where($q->expr->neq('id', 1));
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* </code>
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*
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* @param string $value1 logical expression to compare
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* @param string $value2 logical expression to compare with
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* @return string logical expression
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*/
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public function neq($value1, $value2)
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{
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$value1 = $this->getIdentifier($value1);
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$value2 = $this->getIdentifier($value2);
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return $value1 . ' <> ' . $value2;
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}
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/**
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* Returns the SQL to check if one value is greater than another value.
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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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* $q->select('u.*')
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* ->from('User u')
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* ->where($q->expr->gt('id', 1));
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* </code>
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*
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* @param string $value1 logical expression to compare
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* @param string $value2 logical expression to compare with
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* @return string logical expression
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*/
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public function gt($value1, $value2)
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{
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$value1 = $this->getIdentifier($value1);
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$value2 = $this->getIdentifier($value2);
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return $value1 . ' > ' . $value2;
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}
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/**
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* Returns the SQL to check if one value is greater than or equal to
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* another value.
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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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* $q->select('u.*')
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* ->from('User u')
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* ->where($q->expr->gte('id', 1));
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* </code>
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*
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* @param string $value1 logical expression to compare
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* @param string $value2 logical expression to compare with
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* @return string logical expression
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*/
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public function gte($value1, $value2)
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{
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$value1 = $this->getIdentifier($value1);
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$value2 = $this->getIdentifier($value2);
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return $value1 . ' >= ' . $value2;
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}
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/**
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* Returns the SQL to check if one value is less than another value.
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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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* $q->select('u.*')
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* ->from('User u')
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* ->where($q->expr->lt('id', 1));
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* </code>
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*
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* @param string $value1 logical expression to compare
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* @param string $value2 logical expression to compare with
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* @return string logical expression
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*/
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public function lt($value1, $value2)
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{
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$value1 = $this->getIdentifier($value1);
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$value2 = $this->getIdentifier($value2);
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return $value1 . ' < ' . $value2;
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}
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/**
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* Returns the SQL to check if one value is less than or equal to
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* another value.
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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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* $q->select('u.*')
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* ->from('User u')
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* ->where($q->expr->lte('id', 1));
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* </code>
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*
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* @param string $value1 logical expression to compare
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* @param string $value2 logical expression to compare with
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* @return string logical expression
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*/
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public function lte($value1, $value2)
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{
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$value1 = $this->getIdentifier($value1);
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$value2 = $this->getIdentifier($value2);
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return $value1 . ' <= ' . $value2;
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}
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/**
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* Returns the SQL to check if a value is one in a set of
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* given values..
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*
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* in() accepts an arbitrary number of parameters. The first parameter
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* must always specify the value that should be matched against. Successive
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* must contain a logical expression or an array with logical expressions.
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* These expressions will be matched against the first parameter.
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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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* $q->select('u.*')
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* ->from('User u')
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* ->where($q->expr->in( 'id', array(1,2,3)));
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* </code>
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*
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* @param string $column the value that should be matched against
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* @param string|array(string) values that will be matched against $column
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* @return string logical expression
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*/
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public function in($column, $values)
|
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{
|
|
if ( ! is_array($values)) {
|
|
$values = array($values);
|
|
}
|
|
$values = $this->getIdentifiers($values);
|
|
$column = $this->getIdentifier($column);
|
|
|
|
if (count($values) == 0) {
|
|
throw new Doctrine_Expression_Exception('Values array for IN operator should not be empty.');
|
|
}
|
|
return $column . ' IN (' . implode(', ', $values) . ')';
|
|
}
|
|
/**
|
|
* Returns SQL that checks if a expression is null.
|
|
*
|
|
* Example:
|
|
* <code>
|
|
* $q = new Doctrine_Query();
|
|
* $q->select('u.*')
|
|
* ->from('User u')
|
|
* ->where($q->expr->isNull('id'));
|
|
* </code>
|
|
*
|
|
* @param string $expression the expression that should be compared to null
|
|
* @return string logical expression
|
|
*/
|
|
public function isNull($expression)
|
|
{
|
|
$expression = $this->getIdentifier($expression);
|
|
return $expression . ' IS NULL';
|
|
}
|
|
/**
|
|
* Returns SQL that checks if a expression is not null.
|
|
*
|
|
* Example:
|
|
* <code>
|
|
* $q = new Doctrine_Query();
|
|
* $q->select('u.*')
|
|
* ->from('User u')
|
|
* ->where($q->expr->isNotNull('id'));
|
|
* </code>
|
|
*
|
|
* @param string $expression the expression that should be compared to null
|
|
* @return string logical expression
|
|
*/
|
|
public function isNotNull($expression)
|
|
{
|
|
$expression = $this->getIdentifier($expression);
|
|
return $expression . ' IS NOT NULL';
|
|
}
|
|
/**
|
|
* Returns SQL that checks if an expression evaluates to a value between
|
|
* two values.
|
|
*
|
|
* The parameter $expression is checked if it is between $value1 and $value2.
|
|
*
|
|
* Note: There is a slight difference in the way BETWEEN works on some databases.
|
|
* http://www.w3schools.com/sql/sql_between.asp. If you want complete database
|
|
* independence you should avoid using between().
|
|
*
|
|
* Example:
|
|
* <code>
|
|
* $q = new Doctrine_Query();
|
|
* $q->select('u.*')
|
|
* ->from('User u')
|
|
* ->where($q->expr->between('id', 1, 5));
|
|
* </code>
|
|
*
|
|
* @param string $expression the value to compare to
|
|
* @param string $value1 the lower value to compare with
|
|
* @param string $value2 the higher value to compare with
|
|
* @return string logical expression
|
|
*/
|
|
public function between($expression, $value1, $value2)
|
|
{
|
|
$expression = $this->getIdentifier($expression);
|
|
$value1 = $this->getIdentifier($value1);
|
|
$value2 = $this->getIdentifier($value2);
|
|
return $expression . ' BETWEEN ' .$value1 . ' AND ' . $value2;
|
|
}
|
|
}
|