109 lines
3.7 KiB
PHP
109 lines
3.7 KiB
PHP
/*
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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_Expression');
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/**
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* Doctrine_Expression_Pgsql
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*
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* @package Doctrine ORM
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* @url www.phpdoctrine.com
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* @license LGPL
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*/
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class Doctrine_Expression_Pgsql extends Doctrine_Expression {
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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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* md5() works with the default PostgreSQL 8 versions.
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*
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* If you are using PostgreSQL 7.x or older you need
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* to make sure that the digest procedure is installed.
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* If you use RPMS (Redhat and Mandrake) install the postgresql-contrib
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* package. You must then install the procedure by running this shell command:
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* <code>
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* psql [dbname] < /usr/share/pgsql/contrib/pgcrypto.sql
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* </code>
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* You should make sure you run this as the postgres user.
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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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if ($this->version > 7)
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return 'MD5(' . $column . ')';
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else
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return 'encode(digest(' . $column .', md5), hex)';
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}
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/**
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* Returns part of a string.
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*
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* Note: Not SQL92, but common functionality.
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*
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* @param string $value the target $value the string or the string column.
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* @param int $from extract from this characeter.
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* @param int $len extract this amount of characters.
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* @return string sql that extracts part of a string.
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*/
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public function subString($value, $from, $len = null) {
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$value = $this->getIdentifier($value);
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if ($len === null) {
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$len = $this->getIdentifier($len);
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return 'SUBSTR(' . $value . ', ' . $from . ')';
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} else
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return 'SUBSTR(' . $value . ', ' . $from . ', ' . $len . ')';
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}
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/**
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* Returns a series of strings concatinated
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*
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* concat() accepts an arbitrary number of parameters. Each parameter
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* must contain an expression or an array with expressions.
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*
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* @param string|array(string) strings that will be concatinated.
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* @return string
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*/
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public function concat($arg1, $arg2) {
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$args = func_get_args();
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$cols = $this->getIdentifiers($cols);
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return join(' || ' , $cols);
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}
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/**
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* regexp
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*
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* @return string the regular expression operator
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*/
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public function regexp() {
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return 'SIMILAR TO';
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}
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/**
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* return string to call a function to get random value inside an SQL statement
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*
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* @return return string to generate float between 0 and 1
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* @access public
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*/
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public function random() {
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return 'RANDOM()';
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}
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}
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