mssql.php
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	<?php
	// vim: set et ts=4 sw=4 fdm=marker:
	// +----------------------------------------------------------------------+
	// \| 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. \|
	// +----------------------------------------------------------------------+
	// \| Authors: Lukas Smith <smith@pooteeweet.org> \|
	// \| Daniel Convissor <danielc@php.net> \|
	// +----------------------------------------------------------------------+
	//
	// $Id: mssql.php 295587 2010-02-28 17:16:38Z quipo $
	//

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

	/**
	* MDB2 MS SQL driver
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@pooteeweet.org>
	*/
	class MDB2_Driver_Datatype_mssql 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 (null === $value) {
	return null;
	}
	switch ($type) {
	case 'boolean':
	return $value == '1';
	case 'date':
	if (strlen($value) > 10) {
	$value = substr($value,0,10);
	}
	return $value;
	case 'time':
	if (strlen($value) > 8) {
	$value = substr($value,11,8);
	}
	return $value;
	}
	return parent::_baseConvertResult($value, $type, $rtrim);
	}

	// }}}
	// {{{ _getCollationFieldDeclaration()

	/**
	* Obtain DBMS specific SQL code portion needed to set the COLLATION
	* of a field declaration to be used in statements like CREATE TABLE.
	*
	* @param string $collation name of the collation
	*
	* @return string DBMS specific SQL code portion needed to set the COLLATION
	* of a field declaration.
	*/
	function _getCollationFieldDeclaration($collation)
	{
	return 'COLLATE '.$collation;
	}

	// }}}
	// {{{ 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'] : false;
	$fixed = !empty($field['fixed']) ? $field['fixed'] : false;
	return $fixed ? ($length ? 'CHAR('.$length.')' : 'CHAR('.$db->options['default_text_field_length'].')')
	: ($length ? 'VARCHAR('.$length.')' : 'TEXT');
	case 'clob':
	if (!empty($field['length'])) {
	$length = $field['length'];
	if ($length <= 8000) {
	return 'VARCHAR('.$length.')';
	}
	}
	return 'TEXT';
	case 'blob':
	if (!empty($field['length'])) {
	$length = $field['length'];
	if ($length <= 8000) {
	return "VARBINARY($length)";
	}
	}
	return 'IMAGE';
	case 'integer':
	return 'INT';
	case 'boolean':
	return 'BIT';
	case 'date':
	return 'CHAR ('.strlen('YYYY-MM-DD').')';
	case 'time':
	return 'CHAR ('.strlen('HH:MM:SS').')';
	case 'timestamp':
	return 'CHAR ('.strlen('YYYY-MM-DD HH:MM:SS').')';
	case 'float':
	return 'FLOAT';
	case 'decimal':
	$length = !empty($field['length']) ? $field['length'] : 18;
	$scale = !empty($field['scale']) ? $field['scale'] : $db->options['decimal_places'];
	return 'DECIMAL('.$length.','.$scale.')';
	}
	return '';
	}

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

	$notnull = empty($field['notnull']) ? ' NULL' : ' NOT NULL';
	$default = $autoinc = '';
	if (!empty($field['autoincrement'])) {
	$autoinc = ' IDENTITY PRIMARY KEY';
	} elseif (array_key_exists('default', $field)) {
	if ($field['default'] === '') {
	$field['default'] = 0;
	}
	if (null === $field['default']) {
	$default = ' DEFAULT (null)';
	} else {
	$default = ' DEFAULT (' . $this->quote($field['default'], 'integer') . ')';
	}
	}

	if (!empty($field['unsigned'])) {
	$db->warnings[] = "unsigned integer field \"$name\" is being declared as signed integer";
	}

	$name = $db->quoteIdentifier($name, true);
	return $name.' '.$this->getTypeDeclaration($field).$notnull.$default.$autoinc;
	}

	// }}}
	// {{{ _getCLOBDeclaration()

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

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

	// }}}
	// {{{ _getBLOBDeclaration()

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

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

	// }}}
	// {{{ _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;
	}
	$value = '0x'.bin2hex($this->_readFile($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 (null !== $operator) {
	$field = (null === $field) ? '' : $field.' ';
	$operator = strtoupper($operator);
	switch ($operator) {
	// case insensitive
	case 'ILIKE':
	$match = $field.'LIKE ';
	break;
	case 'NOT ILIKE':
	$match = $field.'NOT LIKE ';
	break;
	// case sensitive
	case 'LIKE':
	$match = $field.'LIKE ';
	break;
	case 'NOT LIKE':
	$match = $field.'NOT 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;
	}

	// }}}
	// {{{ _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)
	{
	// todo: handle length of various int variations
	$db_type = preg_replace('/\d/', '', strtolower($field['type']));
	$length = $field['length'];
	$type = array();
	// todo: unsigned handling seems to be missing
	$unsigned = $fixed = null;
	switch ($db_type) {
	case 'bit':
	$type[0] = 'boolean';
	break;
	case 'tinyint':
	$type[0] = 'integer';
	$length = 1;
	break;
	case 'smallint':
	$type[0] = 'integer';
	$length = 2;
	break;
	case 'int':
	$type[0] = 'integer';
	$length = 4;
	break;
	case 'bigint':
	$type[0] = 'integer';
	$length = 8;
	break;
	case 'smalldatetime':
	case 'datetime':
	$type[0] = 'timestamp';
	break;
	case 'float':
	case 'real':
	case 'numeric':
	$type[0] = 'float';
	break;
	case 'decimal':
	case 'money':
	$type[0] = 'decimal';
	$length = $field['numeric_precision'].','.$field['numeric_scale'];
	break;
	case 'text':
	case 'ntext':
	case 'varchar':
	case 'nvarchar':
	$fixed = false;
	case 'char':
	case 'nchar':
	$type[0] = 'text';
	if ($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 'image':
	case 'varbinary':
	$type[] = 'blob';
	$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);
	}
	// }}}
	}

	?>

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