. */ Doctrine::autoload('Doctrine_Expression_Driver'); /** * Doctrine_Expression_Pgsql * * @package Doctrine * @subpackage Expression * @license http://www.opensource.org/licenses/lgpl-license.php LGPL * @link www.phpdoctrine.com * @since 1.0 * @version $Revision$ * @author Konsta Vesterinen */ 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: * * psql [dbname] < /usr/share/pgsql/contrib/pgcrypto.sql * * You should make sure you run this as the postgres user. * * @return string */ public function md5($column) { $column = $this->getIdentifier($column); if ($this->version > 7) { return 'MD5(' . $column . ')'; } else { return 'encode(digest(' . $column .', md5), hex)'; } } /** * 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 . ')'; } } /** * PostgreSQLs AGE( [, ]) 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( , ) 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( , ) 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 . ')'; } /** * 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; } }