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<?php
/*
* $Id: Pgsql.php 5901 2009-06-22 15:44:45Z jwage $
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information, see
* <http://www.phpdoctrine.org>.
*/
/**
* Doctrine_Expression_Pgsql
*
* @package Doctrine
* @subpackage Expression
* @license http://www.opensource.org/licenses/lgpl-license.php LGPL
* @link www.phpdoctrine.org
* @since 1.0
* @version $Revision: 5901 $
* @author Konsta Vesterinen <kvesteri@cc.hut.fi>
*/
class Doctrine_Expression_Pgsql extends Doctrine_Expression_Driver
{
/**
* Returns the md5 sum of a field.
*
* Note: Not SQL92, but common functionality
*
* md5() works with the default PostgreSQL 8 versions.
*
* If you are using PostgreSQL 7.x or older you need
* to make sure that the digest procedure is installed.
* If you use RPMS (Redhat and Mandrake) install the postgresql-contrib
* package. You must then install the procedure by running this shell command:
* <code>
* psql [dbname] < /usr/share/pgsql/contrib/pgcrypto.sql
* </code>
* You should make sure you run this as the postgres user.
*
* @return string
*/
public function md5($column)
{
$column = $this->getIdentifier($column);
return 'MD5(' . $column . ')';
}
/**
* Returns part of a string.
*
* Note: Not SQL92, but common functionality.
*
* @param string $value the target $value the string or the string column.
* @param int $from extract from this characeter.
* @param int $len extract this amount of characters.
* @return string sql that extracts part of a string.
*/
public function substring($value, $from, $len = null)
{
$value = $this->getIdentifier($value);
if ($len === null) {
$len = $this->getIdentifier($len);
return 'SUBSTR(' . $value . ', ' . $from . ')';
} else {
return 'SUBSTR(' . $value . ', ' . $from . ', ' . $len . ')';
}
}
/**
* Returns a series of strings concatinated
*
* concat() accepts an arbitrary number of parameters. Each parameter
* must contain an expression or an array with expressions.
*
* @param string|array(string) strings that will be concatinated.
* @return string
*/
/**
* PostgreSQLs AGE(<timestamp1> [, <timestamp2>]) function.
*
* @param string $timestamp1 timestamp to subtract from NOW()
* @param string $timestamp2 optional; if given: subtract arguments
* @return string
*/
public function age($timestamp1, $timestamp2 = null) {
if ( $timestamp2 == null ) {
return 'AGE(' . $timestamp1 . ')';
}
return 'AGE(' . $timestamp1 . ', ' . $timestamp2 . ')';
}
/**
* PostgreSQLs DATE_PART( <text>, <time> ) function.
*
* @param string $text what to extract
* @param string $time timestamp or interval to extract from
* @return string
*/
public function date_part($text, $time)
{
return 'DATE_PART(' . $text . ', ' . $time . ')';
}
/**
* PostgreSQLs TO_CHAR( <time>, <text> ) function.
*
* @param string $time timestamp or interval
* @param string $text how to the format the output
* @return string
*/
public function to_char($time, $text) {
return 'TO_CHAR(' . $time . ', ' . $text . ')';
}
/**
* PostgreSQLs CONCAT() function
*
* @param an array of values
* @return string
*/
public function concat()
{
$args = func_get_args();
return join(' || ' , $args);
}
/**
* Returns the SQL string to return the current system date and time.
*
* @return string
*/
public function now()
{
return 'LOCALTIMESTAMP(0)';
}
/**
* regexp
*
* @return string the regular expression operator
*/
public function regexp()
{
return 'SIMILAR TO';
}
/**
* return string to call a function to get random value inside an SQL statement
*
* @return return string to generate float between 0 and 1
* @access public
*/
public function random()
{
return 'RANDOM()';
}
/**
* build a pattern matching string
*
* EXPERIMENTAL
*
* WARNING: this function is experimental and may change signature at
* any time until labelled as non-experimental
*
* @access public
*
* @param array $pattern even keys are strings, odd are patterns (% and _)
* @param string $operator optional pattern operator (LIKE, ILIKE and maybe others in the future)
* @param string $field optional field name that is being matched against
* (might be required when emulating ILIKE)
*
* @return string SQL pattern
*/
public function matchPattern($pattern, $operator = null, $field = null)
{
$match = '';
if ( ! is_null($operator)) {
$field = is_null($field) ? '' : $field.' ';
$operator = strtoupper($operator);
switch ($operator) {
// case insensitive
case 'ILIKE':
$match = $field.'ILIKE ';
break;
// case sensitive
case 'LIKE':
$match = $field.'LIKE ';
break;
default:
throw new Doctrine_Expression_Pgsql_Exception('not a supported operator type:'. $operator);
}
}
$match.= "'";
foreach ($pattern as $key => $value) {
if ($key % 2) {
$match.= $value;
} else {
$match.= $this->conn->escapePattern($this->conn->escape($value));
}
}
$match.= "'";
$match.= $this->patternEscapeString();
return $match;
}
/**
* return syntax for pgsql TRANSLATE() dbms function
*
* @return string $sql
*/
public function translate($string, $from, $to)
{
$translate = 'TRANSLATE(' . $string . ', ' . $from . ', ' . $to . ')';
return $translate;
}
}
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