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			<?php
			// +----------------------------------------------------------------------+
			// \| PHP versions 4 and 5 \|
			// +----------------------------------------------------------------------+
			// \| Copyright (c) 1998-2007 Manuel Lemos, Tomas V.V.Cox, \|
			// \| Stig. S. Bakken, Lukas Smith \|
			// \| All rights reserved. \|
			// +----------------------------------------------------------------------+
			// \| MDB2 is a merge of PEAR DB and Metabases that provides a unified DB \|
			// \| API as well as database abstraction for PHP applications. \|
			// \| This LICENSE is in the BSD license style. \|
			// \| \|
			// \| Redistribution and use in source and binary forms, with or without \|
			// \| modification, are permitted provided that the following conditions \|
			// \| are met: \|
			// \| \|
			// \| Redistributions of source code must retain the above copyright \|
			// \| notice, this list of conditions and the following disclaimer. \|
			// \| \|
			// \| Redistributions in binary form must reproduce the above copyright \|
			// \| notice, this list of conditions and the following disclaimer in the \|
			// \| documentation and/or other materials provided with the distribution. \|
			// \| \|
			// \| Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, \|
			// \| Lukas Smith nor the names of his contributors may be used to endorse \|
			// \| or promote products derived from this software without specific prior\|
			// \| written permission. \|
			// \| \|
			// \| 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 \|
			// \| REGENTS 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. \|
			// +----------------------------------------------------------------------+
			// \| Author: Paul Cooper <pgc@ucecom.com> \|
			// +----------------------------------------------------------------------+
			//
			// $Id: pgsql.php,v 1.91 2008/03/09 12:28:08 quipo Exp $

			require_once 'MDB2/Driver/Datatype/Common.php';

			/**
			* MDB2 PostGreSQL driver
			*
			* @package MDB2
			* @category Database
			* @author Paul Cooper <pgc@ucecom.com>
			*/
			class MDB2_Driver_Datatype_pgsql extends MDB2_Driver_Datatype_Common
			{
			// {{{ _baseConvertResult()

			/**
			* General type conversion method
			*
			* @param mixed $value refernce to a value to be converted
			* @param string $type specifies which type to convert to
			* @param boolean $rtrim [optional] when TRUE [default], apply rtrim() to text
			* @return object a MDB2 error on failure
			* @access protected
			*/
			function _baseConvertResult($value, $type, $rtrim = true)
			{
			if (is_null($value)) {
			return null;
			}
			switch ($type) {
			case 'boolean':
			return $value == 't';
			case 'float':
			return doubleval($value);
			case 'date':
			return $value;
			case 'time':
			return substr($value, 0, strlen('HH:MM:SS'));
			case 'timestamp':
			return substr($value, 0, strlen('YYYY-MM-DD HH:MM:SS'));
			case 'blob':
			$value = pg_unescape_bytea($value);
			return parent::_baseConvertResult($value, $type, $rtrim);
			}
			return parent::_baseConvertResult($value, $type, $rtrim);
			}

			// }}}
			// {{{ getTypeDeclaration()

			/**
			* Obtain DBMS specific SQL code portion needed to declare an text type
			* field to be used in statements like CREATE TABLE.
			*
			* @param array $field associative array with the name of the properties
			* of the field being declared as array indexes. Currently, the types
			* of supported field properties are as follows:
			*
			* length
			* Integer value that determines the maximum length of the text
			* field. If this argument is missing the field should be
			* declared to have the longest length allowed by the DBMS.
			*
			* default
			* Text value to be used as default for this field.
			*
			* notnull
			* Boolean flag that indicates whether this field is constrained
			* to not be set to null.
			* @return string DBMS specific SQL code portion that should be used to
			* declare the specified field.
			* @access public
			*/
			function getTypeDeclaration($field)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			switch ($field['type']) {
			case 'text':
			$length = !empty($field['length'])
			? $field['length'] : $db->options['default_text_field_length'];
			$fixed = !empty($field['fixed']) ? $field['fixed'] : false;
			return $fixed ? ($length ? 'CHAR('.$length.')' : 'CHAR('.$db->options['default_text_field_length'].')')
			: ($length ? 'VARCHAR('.$length.')' : 'TEXT');
			case 'clob':
			return 'TEXT';
			case 'blob':
			return 'BYTEA';
			case 'integer':
			if (!empty($field['autoincrement'])) {
			if (!empty($field['length'])) {
			$length = $field['length'];
			if ($length > 4) {
			return 'BIGSERIAL PRIMARY KEY';
			}
			}
			return 'SERIAL PRIMARY KEY';
			}
			if (!empty($field['length'])) {
			$length = $field['length'];
			if ($length <= 2) {
			return 'SMALLINT';
			} elseif ($length == 3 \|\| $length == 4) {
			return 'INT';
			} elseif ($length > 4) {
			return 'BIGINT';
			}
			}
			return 'INT';
			case 'boolean':
			return 'BOOLEAN';
			case 'date':
			return 'DATE';
			case 'time':
			return 'TIME without time zone';
			case 'timestamp':
			return 'TIMESTAMP without time zone';
			case 'float':
			return 'FLOAT8';
			case 'decimal':
			$length = !empty($field['length']) ? $field['length'] : 18;
			$scale = !empty($field['scale']) ? $field['scale'] : $db->options['decimal_places'];
			return 'NUMERIC('.$length.','.$scale.')';
			}
			}

			// }}}
			// {{{ _getIntegerDeclaration()

			/**
			* Obtain DBMS specific SQL code portion needed to declare an integer type
			* field to be used in statements like CREATE TABLE.
			*
			* @param string $name name the field to be declared.
			* @param array $field associative array with the name of the properties
			* of the field being declared as array indexes. Currently, the types
			* of supported field properties are as follows:
			*
			* unsigned
			* Boolean flag that indicates whether the field should be
			* declared as unsigned integer if possible.
			*
			* default
			* Integer value to be used as default for this field.
			*
			* notnull
			* Boolean flag that indicates whether this field is constrained
			* to not be set to null.
			* @return string DBMS specific SQL code portion that should be used to
			* declare the specified field.
			* @access protected
			*/
			function _getIntegerDeclaration($name, $field)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if (!empty($field['unsigned'])) {
			$db->warnings[] = "unsigned integer field \"$name\" is being declared as signed integer";
			}
			if (!empty($field['autoincrement'])) {
			$name = $db->quoteIdentifier($name, true);
			return $name.' '.$this->getTypeDeclaration($field);
			}
			$default = '';
			if (array_key_exists('default', $field)) {
			if ($field['default'] === '') {
			$field['default'] = empty($field['notnull']) ? null : 0;
			}
			$default = ' DEFAULT '.$this->quote($field['default'], 'integer');
			}

			$notnull = empty($field['notnull']) ? '' : ' NOT NULL';
			$name = $db->quoteIdentifier($name, true);
			return $name.' '.$this->getTypeDeclaration($field).$default.$notnull;
			}

			// }}}
			// {{{ _quoteCLOB()

			/**
			* Convert a text value into a DBMS specific format that is suitable to
			* compose query statements.
			*
			* @param string $value text string value that is intended to be converted.
			* @param bool $quote determines if the value should be quoted and escaped
			* @param bool $escape_wildcards if to escape escape wildcards
			* @return string text string that represents the given argument value in
			* a DBMS specific format.
			* @access protected
			*/
			function _quoteCLOB($value, $quote, $escape_wildcards)
			{
			return $this->_quoteText($value, $quote, $escape_wildcards);
			}

			// }}}
			// {{{ _quoteBLOB()

			/**
			* Convert a text value into a DBMS specific format that is suitable to
			* compose query statements.
			*
			* @param string $value text string value that is intended to be converted.
			* @param bool $quote determines if the value should be quoted and escaped
			* @param bool $escape_wildcards if to escape escape wildcards
			* @return string text string that represents the given argument value in
			* a DBMS specific format.
			* @access protected
			*/
			function _quoteBLOB($value, $quote, $escape_wildcards)
			{
			if (!$quote) {
			return $value;
			}
			if (version_compare(PHP_VERSION, '5.2.0RC6', '>=')) {
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			$connection = $db->getConnection();
			if (PEAR::isError($connection)) {
			return $connection;
			}
			$value = @pg_escape_bytea($connection, $value);
			} else {
			$value = @pg_escape_bytea($value);
			}
			return "'".$value."'";
			}

			// }}}
			// {{{ _quoteBoolean()

			/**
			* Convert a text value into a DBMS specific format that is suitable to
			* compose query statements.
			*
			* @param string $value text string value that is intended to be converted.
			* @param bool $quote determines if the value should be quoted and escaped
			* @param bool $escape_wildcards if to escape escape wildcards
			* @return string text string that represents the given argument value in
			* a DBMS specific format.
			* @access protected
			*/
			function _quoteBoolean($value, $quote, $escape_wildcards)
			{
			$value = $value ? 't' : 'f';
			if (!$quote) {
			return $value;
			}
			return "'".$value."'";
			}

			// }}}
			// {{{ matchPattern()

			/**
			* build a pattern matching string
			*
			* @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 $field optional field name that is being matched against
			* (might be required when emulating ILIKE)
			*
			* @return string SQL pattern
			*/
			function matchPattern($pattern, $operator = null, $field = null)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			$match = '';
			if (!is_null($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:
			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'not a supported operator type:'. $operator, __FUNCTION__);
			}
			}
			$match.= "'";
			foreach ($pattern as $key => $value) {
			if ($key % 2) {
			$match.= $value;
			} else {
			$match.= $db->escapePattern($db->escape($value));
			}
			}
			$match.= "'";
			$match.= $this->patternEscapeString();
			return $match;
			}

			// }}}
			// {{{ patternEscapeString()

			/**
			* build string to define escape pattern string
			*
			* @access public
			*
			*
			* @return string define escape pattern
			*/
			function patternEscapeString()
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			return ' ESCAPE '.$this->quote($db->string_quoting['escape_pattern']);
			}

			// }}}
			// {{{ _mapNativeDatatype()

			/**
			* Maps a native array description of a field to a MDB2 datatype and length
			*
			* @param array $field native field description
			* @return array containing the various possible types, length, sign, fixed
			* @access public
			*/
			function _mapNativeDatatype($field)
			{
			$db_type = strtolower($field['type']);
			$length = $field['length'];
			$type = array();
			$unsigned = $fixed = null;
			switch ($db_type) {
			case 'smallint':
			case 'int2':
			$type[] = 'integer';
			$unsigned = false;
			$length = 2;
			if ($length == '2') {
			$type[] = 'boolean';
			if (preg_match('/^(is\|has)/', $field['name'])) {
			$type = array_reverse($type);
			}
			}
			break;
			case 'int':
			case 'int4':
			case 'integer':
			case 'serial':
			case 'serial4':
			$type[] = 'integer';
			$unsigned = false;
			$length = 4;
			break;
			case 'bigint':
			case 'int8':
			case 'bigserial':
			case 'serial8':
			$type[] = 'integer';
			$unsigned = false;
			$length = 8;
			break;
			case 'bool':
			case 'boolean':
			$type[] = 'boolean';
			$length = null;
			break;
			case 'text':
			case 'varchar':
			$fixed = false;
			case 'unknown':
			case 'char':
			case 'bpchar':
			$type[] = 'text';
			if ($length == '1') {
			$type[] = 'boolean';
			if (preg_match('/^(is\|has)/', $field['name'])) {
			$type = array_reverse($type);
			}
			} elseif (strstr($db_type, 'text')) {
			$type[] = 'clob';
			$type = array_reverse($type);
			}
			if ($fixed !== false) {
			$fixed = true;
			}
			break;
			case 'date':
			$type[] = 'date';
			$length = null;
			break;
			case 'datetime':
			case 'timestamp':
			case 'timestamptz':
			$type[] = 'timestamp';
			$length = null;
			break;
			case 'time':
			$type[] = 'time';
			$length = null;
			break;
			case 'float':
			case 'float4':
			case 'float8':
			case 'double':
			case 'real':
			$type[] = 'float';
			break;
			case 'decimal':
			case 'money':
			case 'numeric':
			$type[] = 'decimal';
			if (isset($field['scale'])) {
			$length = $length.','.$field['scale'];
			}
			break;
			case 'tinyblob':
			case 'mediumblob':
			case 'longblob':
			case 'blob':
			case 'bytea':
			$type[] = 'blob';
			$length = null;
			break;
			case 'oid':
			$type[] = 'blob';
			$type[] = 'clob';
			$length = null;
			break;
			case 'year':
			$type[] = 'integer';
			$type[] = 'date';
			$length = null;
			break;
			default:
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}
			return $db->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,
			'unknown database attribute type: '.$db_type, __FUNCTION__);
			}

			if ((int)$length <= 0) {
			$length = null;
			}

			return array($type, $length, $unsigned, $fixed);
			}

			// }}}
			// {{{ mapPrepareDatatype()

			/**
			* Maps an mdb2 datatype to native prepare type
			*
			* @param string $type
			* @return string
			* @access public
			*/
			function mapPrepareDatatype($type)
			{
			$db =& $this->getDBInstance();
			if (PEAR::isError($db)) {
			return $db;
			}

			if (!empty($db->options['datatype_map'][$type])) {
			$type = $db->options['datatype_map'][$type];
			if (!empty($db->options['datatype_map_callback'][$type])) {
			$parameter = array('type' => $type);
			return call_user_func_array($db->options['datatype_map_callback'][$type], array(&$db, __FUNCTION__, $parameter));
			}
			}

			switch ($type) {
			case 'integer':
			return 'int';
			case 'boolean':
			return 'bool';
			case 'decimal':
			case 'float':
			return 'numeric';
			case 'clob':
			return 'text';
			case 'blob':
			return 'bytea';
			default:
			break;
			}
			return $type;
			}
			// }}}
			}
			?>