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<?php
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/*
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* $Id: Pgsql.php 2963 2007-10-21 06:23:59Z Jonathan.Wage $
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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_Expression_Driver');
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/**
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* Doctrine_Expression_Pgsql
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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: 2963 $
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* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
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*/
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class Doctrine_Expression_Pgsql extends Doctrine_Expression_Driver
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{
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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($column)
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{
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$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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/**
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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, $len = null)
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{
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$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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/**
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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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/**
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* PostgreSQLs AGE(<timestamp1> [, <timestamp2>]) function.
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*
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* @param string $timestamp1 timestamp to subtract from NOW()
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* @param string $timestamp2 optional; if given: subtract arguments
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* @return string
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*/
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public function age($timestamp1, $timestamp2 = null) {
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if ( $timestamp2 == null ) {
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return 'AGE(' . $timestamp1 . ')';
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}
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return 'AGE(' . $timestamp1 . ', ' . $timestamp2 . ')';
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}
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/**
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* PostgreSQLs DATE_PART( <text>, <time> ) function.
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*
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* @param string $text what to extract
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* @param string $time timestamp or interval to extract from
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* @return string
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*/
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public function date_part($text, $time) {
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return 'DATE_PART(' . $text . ', ' . $time . ')';
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}
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/**
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* PostgreSQLs TO_CHAR( <time>, <text> ) function.
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*
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* @param string $time timestamp or interval
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* @param string $text how to the format the output
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* @return string
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*/
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public function to_char($time, $text) {
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return 'TO_CHAR(' . $time . ', ' . $text . ')';
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}
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/**
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* PostgreSQLs CONCAT() function
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*
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* @param an array of values
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* @return string
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*/
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public function concat()
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{
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$args = func_get_args();
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return join(' || ' , $args);
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}
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/**
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* Returns the SQL string to return the current system date and time.
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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 'LOCALTIMESTAMP(0)';
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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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{
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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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{
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return 'RANDOM()';
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}
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/**
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* build a pattern matching string
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*
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* EXPERIMENTAL
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*
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* WARNING: this function is experimental and may change signature at
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* any time until labelled as non-experimental
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*
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* @access public
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*
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* @param array $pattern even keys are strings, odd are patterns (% and _)
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* @param string $operator optional pattern operator (LIKE, ILIKE and maybe others in the future)
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* @param string $field optional field name that is being matched against
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* (might be required when emulating ILIKE)
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*
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* @return string SQL pattern
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*/
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public function matchPattern($pattern, $operator = null, $field = null)
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{
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$match = '';
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if ( ! is_null($operator)) {
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$field = is_null($field) ? '' : $field.' ';
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$operator = strtoupper($operator);
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switch ($operator) {
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// case insensitive
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case 'ILIKE':
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$match = $field.'ILIKE ';
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break;
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// case sensitive
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case 'LIKE':
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$match = $field.'LIKE ';
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break;
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default:
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throw new Doctrine_Expression_Pgsql_Exception('not a supported operator type:'. $operator);
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}
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}
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$match.= "'";
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foreach ($pattern as $key => $value) {
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if ($key % 2) {
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$match.= $value;
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} else {
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$match.= $this->conn->escapePattern($this->conn->escape($value));
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}
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}
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$match.= "'";
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$match.= $this->patternEscapeString();
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return $match;
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}
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} |