240 lines
7.6 KiB
PHP
240 lines
7.6 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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* 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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throw new Doctrine_Connection_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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$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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$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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$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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$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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$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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$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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$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, $decimals) {
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$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, $expression2) {
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$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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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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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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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
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* @param string $str literal string
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* @return string
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*/
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public function locate($substr, $str) {
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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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return 'NOW()';
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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, $len = null) {
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$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 ' . $len . ')';
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}
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}
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/**
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* Returns a series of strings concatinated
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*
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* concat() accepts an arbitrary number of parameters. Each parameter
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* must contain an expression or an array with expressions.
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*
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* @param string|array(string) strings that will be concatinated.
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*/
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public function concat($arg1, $arg2) {
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$args = func_get_args();
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$cols = $this->getIdentifiers($cols);
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return 'CONCAT(' . join(', ', $cols) . ')';
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}
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}
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