mssql.php
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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, Frank M. Kromann, Lorenzo Alberton \|
	// \| 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> \|
	// \| Lorenzo Alberton <l.alberton@quipo.it> \|
	// +----------------------------------------------------------------------+
	//
	// $Id: mssql.php 292715 2009-12-28 14:06:34Z quipo $
	//

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

	/**
	* MDB2 MSSQL driver for the schema reverse engineering module
	*
	* @package MDB2
	* @category Database
	* @author Lukas Smith <smith@dybnet.de>
	* @author Lorenzo Alberton <l.alberton@quipo.it>
	*/
	class MDB2_Driver_Reverse_mssql extends MDB2_Driver_Reverse_Common
	{
	// {{{ getTableFieldDefinition()

	/**
	* Get the structure of a field into an array
	*
	* @param string $table_name name of table that should be used in method
	* @param string $field_name name of field that should be used in method
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function getTableFieldDefinition($table_name, $field_name)
	{
	$db =& $this->getDBInstance();
	if (PEAR::isError($db)) {
	return $db;
	}

	$result = $db->loadModule('Datatype', null, true);
	if (PEAR::isError($result)) {
	return $result;
	}

	list($schema, $table) = $this->splitTableSchema($table_name);

	$table = $db->quoteIdentifier($table, true);
	$fldname = $db->quoteIdentifier($field_name, true);

	$query = "SELECT t.table_name,
	c.column_name 'name',
	c.data_type 'type',
	CASE c.is_nullable WHEN 'YES' THEN 1 ELSE 0 END AS 'is_nullable',
	c.column_default,
	c.character_maximum_length 'length',
	c.numeric_precision,
	c.numeric_scale,
	c.character_set_name,
	c.collation_name
	FROM INFORMATION_SCHEMA.TABLES t,
	INFORMATION_SCHEMA.COLUMNS c
	WHERE t.table_name = c.table_name
	AND t.table_name = '$table'
	AND c.column_name = '$fldname'";
	if (!empty($schema)) {
	$query .= " AND t.table_schema = '" .$db->quoteIdentifier($schema, true) ."'";
	}
	$query .= ' ORDER BY t.table_name';
	$column = $db->queryRow($query, null, MDB2_FETCHMODE_ASSOC);
	if (PEAR::isError($column)) {
	return $column;
	}
	if (empty($column)) {
	return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'it was not specified an existing table column', __FUNCTION__);
	}

	if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
	if ($db->options['field_case'] == CASE_LOWER) {
	$column['name'] = strtolower($column['name']);
	} else {
	$column['name'] = strtoupper($column['name']);
	}
	} else {
	$column = array_change_key_case($column, $db->options['field_case']);
	}
	$mapped_datatype = $db->datatype->mapNativeDatatype($column);
	if (PEAR::isError($mapped_datatype)) {
	return $mapped_datatype;
	}
	list($types, $length, $unsigned, $fixed) = $mapped_datatype;
	$notnull = true;
	if ($column['is_nullable']) {
	$notnull = false;
	}
	$default = false;
	if (array_key_exists('column_default', $column)) {
	$default = $column['column_default'];
	if ((null === $default) && $notnull) {
	$default = '';
	} elseif (strlen($default) > 4
	&& substr($default, 0, 1) == '('
	&& substr($default, -1, 1) == ')'
	) {
	//mssql wraps the default value in parentheses: "((1234))", "(NULL)"
	$default = trim($default, '()');
	if ($default == 'NULL') {
	$default = null;
	}
	}
	}
	$definition[0] = array(
	'notnull' => $notnull,
	'nativetype' => preg_replace('/^([a-z]+)[^a-z].*/i', '\\1', $column['type'])
	);
	if (null !== $length) {
	$definition[0]['length'] = $length;
	}
	if (null !== $unsigned) {
	$definition[0]['unsigned'] = $unsigned;
	}
	if (null !== $fixed) {
	$definition[0]['fixed'] = $fixed;
	}
	if (false !== $default) {
	$definition[0]['default'] = $default;
	}
	foreach ($types as $key => $type) {
	$definition[$key] = $definition[0];
	if ($type == 'clob' \|\| $type == 'blob') {
	unset($definition[$key]['default']);
	}
	$definition[$key]['type'] = $type;
	$definition[$key]['mdb2type'] = $type;
	}
	return $definition;
	}

	// }}}
	// {{{ getTableIndexDefinition()

	/**
	* Get the structure of an index into an array
	*
	* @param string $table_name name of table that should be used in method
	* @param string $index_name name of index that should be used in method
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function getTableIndexDefinition($table_name, $index_name)
	{
	$db =& $this->getDBInstance();
	if (PEAR::isError($db)) {
	return $db;
	}

	list($schema, $table) = $this->splitTableSchema($table_name);

	$table = $db->quoteIdentifier($table, true);
	//$idxname = $db->quoteIdentifier($index_name, true);

	$query = "SELECT OBJECT_NAME(i.id) tablename,
	i.name indexname,
	c.name field_name,
	CASE INDEXKEY_PROPERTY(i.id, i.indid, ik.keyno, 'IsDescending')
	WHEN 1 THEN 'DESC' ELSE 'ASC'
	END 'collation',
	ik.keyno 'position'
	FROM sysindexes i
	JOIN sysindexkeys ik ON ik.id = i.id AND ik.indid = i.indid
	JOIN syscolumns c ON c.id = ik.id AND c.colid = ik.colid
	WHERE OBJECT_NAME(i.id) = '$table'
	AND i.name = '%s'
	AND NOT EXISTS (
	SELECT *
	FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE k
	WHERE k.table_name = OBJECT_NAME(i.id)
	AND k.constraint_name = i.name";
	if (!empty($schema)) {
	$query .= " AND k.table_schema = '" .$db->quoteIdentifier($schema, true) ."'";
	}
	$query .= ')
	ORDER BY tablename, indexname, ik.keyno';

	$index_name_mdb2 = $db->getIndexName($index_name);
	$result = $db->queryRow(sprintf($query, $index_name_mdb2));
	if (!PEAR::isError($result) && (null !== $result)) {
	// apply 'idxname_format' only if the query succeeded, otherwise
	// fallback to the given $index_name, without transformation
	$index_name = $index_name_mdb2;
	}
	$result = $db->query(sprintf($query, $index_name));
	if (PEAR::isError($result)) {
	return $result;
	}

	$definition = array();
	while (is_array($row = $result->fetchRow(MDB2_FETCHMODE_ASSOC))) {
	$column_name = $row['field_name'];
	if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
	if ($db->options['field_case'] == CASE_LOWER) {
	$column_name = strtolower($column_name);
	} else {
	$column_name = strtoupper($column_name);
	}
	}
	$definition['fields'][$column_name] = array(
	'position' => (int)$row['position'],
	);
	if (!empty($row['collation'])) {
	$definition['fields'][$column_name]['sorting'] = ($row['collation'] == 'ASC'
	? 'ascending' : 'descending');
	}
	}
	$result->free();
	if (empty($definition['fields'])) {
	return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	'it was not specified an existing table index', __FUNCTION__);
	}
	return $definition;
	}

	// }}}
	// {{{ getTableConstraintDefinition()

	/**
	* Get the structure of a constraint into an array
	*
	* @param string $table_name name of table that should be used in method
	* @param string $constraint_name name of constraint that should be used in method
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function getTableConstraintDefinition($table_name, $constraint_name)
	{
	$db =& $this->getDBInstance();
	if (PEAR::isError($db)) {
	return $db;
	}

	list($schema, $table) = $this->splitTableSchema($table_name);

	$table = $db->quoteIdentifier($table, true);
	$query = "SELECT k.table_name,
	k.column_name field_name,
	CASE c.constraint_type WHEN 'PRIMARY KEY' THEN 1 ELSE 0 END 'primary',
	CASE c.constraint_type WHEN 'UNIQUE' THEN 1 ELSE 0 END 'unique',
	CASE c.constraint_type WHEN 'FOREIGN KEY' THEN 1 ELSE 0 END 'foreign',
	CASE c.constraint_type WHEN 'CHECK' THEN 1 ELSE 0 END 'check',
	CASE c.is_deferrable WHEN 'NO' THEN 0 ELSE 1 END 'deferrable',
	CASE c.initially_deferred WHEN 'NO' THEN 0 ELSE 1 END 'initiallydeferred',
	rc.match_option 'match',
	rc.update_rule 'onupdate',
	rc.delete_rule 'ondelete',
	kcu.table_name 'references_table',
	kcu.column_name 'references_field',
	k.ordinal_position 'field_position'
	FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE k
	LEFT JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS c
	ON k.table_name = c.table_name
	AND k.table_schema = c.table_schema
	AND k.table_catalog = c.table_catalog
	AND k.constraint_catalog = c.constraint_catalog
	AND k.constraint_name = c.constraint_name
	LEFT JOIN INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc
	ON rc.constraint_schema = c.constraint_schema
	AND rc.constraint_catalog = c.constraint_catalog
	AND rc.constraint_name = c.constraint_name
	LEFT JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE kcu
	ON rc.unique_constraint_schema = kcu.constraint_schema
	AND rc.unique_constraint_catalog = kcu.constraint_catalog
	AND rc.unique_constraint_name = kcu.constraint_name
	AND k.ordinal_position = kcu.ordinal_position
	WHERE k.constraint_catalog = DB_NAME()
	AND k.table_name = '$table'
	AND k.constraint_name = '%s'";
	if (!empty($schema)) {
	$query .= " AND k.table_schema = '" .$db->quoteIdentifier($schema, true) ."'";
	}
	$query .= ' ORDER BY k.constraint_name,
	k.ordinal_position';

	$constraint_name_mdb2 = $db->getIndexName($constraint_name);
	$result = $db->queryRow(sprintf($query, $constraint_name_mdb2));
	if (!PEAR::isError($result) && (null !== $result)) {
	// apply 'idxname_format' only if the query succeeded, otherwise
	// fallback to the given $index_name, without transformation
	$constraint_name = $constraint_name_mdb2;
	}
	$result = $db->query(sprintf($query, $constraint_name));
	if (PEAR::isError($result)) {
	return $result;
	}

	$definition = array(
	'fields' => array()
	);
	while (is_array($row = $result->fetchRow(MDB2_FETCHMODE_ASSOC))) {
	$row = array_change_key_case($row, CASE_LOWER);
	$column_name = $row['field_name'];
	if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
	if ($db->options['field_case'] == CASE_LOWER) {
	$column_name = strtolower($column_name);
	} else {
	$column_name = strtoupper($column_name);
	}
	}
	$definition['fields'][$column_name] = array(
	'position' => (int)$row['field_position']
	);
	if ($row['foreign']) {
	$ref_column_name = $row['references_field'];
	if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
	if ($db->options['field_case'] == CASE_LOWER) {
	$ref_column_name = strtolower($ref_column_name);
	} else {
	$ref_column_name = strtoupper($ref_column_name);
	}
	}
	$definition['references']['table'] = $row['references_table'];
	$definition['references']['fields'][$ref_column_name] = array(
	'position' => (int)$row['field_position']
	);
	}
	//collation?!?
	/*
	if (!empty($row['collation'])) {
	$definition['fields'][$column_name]['sorting'] = ($row['collation'] == 'ASC'
	? 'ascending' : 'descending');
	}
	*/
	$lastrow = $row;
	// otherwise $row is no longer usable on exit from loop
	}
	$result->free();
	if (empty($definition['fields'])) {
	return $db->raiseError(MDB2_ERROR_NOT_FOUND, null, null,
	$constraint_name . ' is not an existing table constraint', __FUNCTION__);
	}

	$definition['primary'] = (boolean)$lastrow['primary'];
	$definition['unique'] = (boolean)$lastrow['unique'];
	$definition['foreign'] = (boolean)$lastrow['foreign'];
	$definition['check'] = (boolean)$lastrow['check'];
	$definition['deferrable'] = (boolean)$lastrow['deferrable'];
	$definition['initiallydeferred'] = (boolean)$lastrow['initiallydeferred'];
	$definition['onupdate'] = $lastrow['onupdate'];
	$definition['ondelete'] = $lastrow['ondelete'];
	$definition['match'] = $lastrow['match'];

	return $definition;
	}

	// }}}
	// {{{ getTriggerDefinition()

	/**
	* Get the structure of a trigger into an array
	*
	* EXPERIMENTAL
	*
	* WARNING: this function is experimental and may change the returned value
	* at any time until labelled as non-experimental
	*
	* @param string $trigger name of trigger that should be used in method
	* @return mixed data array on success, a MDB2 error on failure
	* @access public
	*/
	function getTriggerDefinition($trigger)
	{
	$db =& $this->getDBInstance();
	if (PEAR::isError($db)) {
	return $db;
	}

	$query = "SELECT sys1.name trigger_name,
	sys2.name table_name,
	c.text trigger_body,
	c.encrypted is_encripted,
	CASE
	WHEN OBJECTPROPERTY(sys1.id, 'ExecIsTriggerDisabled') = 1
	THEN 0 ELSE 1
	END trigger_enabled,
	CASE
	WHEN OBJECTPROPERTY(sys1.id, 'ExecIsInsertTrigger') = 1
	THEN 'INSERT'
	WHEN OBJECTPROPERTY(sys1.id, 'ExecIsUpdateTrigger') = 1
	THEN 'UPDATE'
	WHEN OBJECTPROPERTY(sys1.id, 'ExecIsDeleteTrigger') = 1
	THEN 'DELETE'
	END trigger_event,
	CASE WHEN OBJECTPROPERTY(sys1.id, 'ExecIsInsteadOfTrigger') = 1
	THEN 'INSTEAD OF' ELSE 'AFTER'
	END trigger_type,
	'' trigger_comment
	FROM sysobjects sys1
	JOIN sysobjects sys2 ON sys1.parent_obj = sys2.id
	JOIN syscomments c ON sys1.id = c.id
	WHERE sys1.xtype = 'TR'
	AND sys1.name = ". $db->quote($trigger, 'text');

	$types = array(
	'trigger_name' => 'text',
	'table_name' => 'text',
	'trigger_body' => 'text',
	'trigger_type' => 'text',
	'trigger_event' => 'text',
	'trigger_comment' => 'text',
	'trigger_enabled' => 'boolean',
	'is_encripted' => 'boolean',
	);

	$def = $db->queryRow($query, $types, MDB2_FETCHMODE_ASSOC);
	if (PEAR::isError($def)) {
	return $def;
	}
	$trg_body = $db->queryCol('EXEC sp_helptext '. $db->quote($trigger, 'text'), 'text');
	if (!PEAR::isError($trg_body)) {
	$def['trigger_body'] = implode(' ', $trg_body);
	}
	return $def;
	}

	// }}}
	// {{{ tableInfo()

	/**
	* Returns information about a table or a result set
	*
	* NOTE: only supports 'table' and 'flags' if <var>$result</var>
	* is a table name.
	*
	* @param object\|string $result MDB2_result object from a query or a
	* string containing the name of a table.
	* While this also accepts a query result
	* resource identifier, this behavior is
	* deprecated.
	* @param int $mode a valid tableInfo mode
	*
	* @return array an associative array with the information requested.
	* A MDB2_Error object on failure.
	*
	* @see MDB2_Driver_Common::tableInfo()
	*/
	function tableInfo($result, $mode = null)
	{
	if (is_string($result)) {
	return parent::tableInfo($result, $mode);
	}

	$db =& $this->getDBInstance();
	if (PEAR::isError($db)) {
	return $db;
	}

	$resource = MDB2::isResultCommon($result) ? $result->getResource() : $result;
	if (!is_resource($resource)) {
	return $db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,
	'Could not generate result resource', __FUNCTION__);
	}

	if ($db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {
	if ($db->options['field_case'] == CASE_LOWER) {
	$case_func = 'strtolower';
	} else {
	$case_func = 'strtoupper';
	}
	} else {
	$case_func = 'strval';
	}

	$count = @mssql_num_fields($resource);
	$res = array();

	if ($mode) {
	$res['num_fields'] = $count;
	}

	$db->loadModule('Datatype', null, true);
	for ($i = 0; $i < $count; $i++) {
	$res[$i] = array(
	'table' => '',
	'name' => $case_func(@mssql_field_name($resource, $i)),
	'type' => @mssql_field_type($resource, $i),
	'length' => @mssql_field_length($resource, $i),
	'flags' => '',
	);
	$mdb2type_info = $db->datatype->mapNativeDatatype($res[$i]);
	if (PEAR::isError($mdb2type_info)) {
	return $mdb2type_info;
	}
	$res[$i]['mdb2type'] = $mdb2type_info[0][0];
	if ($mode & MDB2_TABLEINFO_ORDER) {
	$res['order'][$res[$i]['name']] = $i;
	}
	if ($mode & MDB2_TABLEINFO_ORDERTABLE) {
	$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
	}
	}

	return $res;
	}

	// }}}
	// {{{ _mssql_field_flags()

	/**
	* Get a column's flags
	*
	* Supports "not_null", "primary_key",
	* "auto_increment" (mssql identity), "timestamp" (mssql timestamp),
	* "unique_key" (mssql unique index, unique check or primary_key) and
	* "multiple_key" (multikey index)
	*
	* mssql timestamp is NOT similar to the mysql timestamp so this is maybe
	* not useful at all - is the behaviour of mysql_field_flags that primary
	* keys are alway unique? is the interpretation of multiple_key correct?
	*
	* @param string $table the table name
	* @param string $column the field name
	*
	* @return string the flags
	*
	* @access protected
	* @author Joern Barthel <j_barthel@web.de>
	*/
	function _mssql_field_flags($table, $column)
	{
	$db =& $this->getDBInstance();
	if (PEAR::isError($db)) {
	return $db;
	}

	static $tableName = null;
	static $flags = array();

	if ($table != $tableName) {

	$flags = array();
	$tableName = $table;

	// get unique and primary keys
	$res = $db->queryAll("EXEC SP_HELPINDEX[$table]", null, MDB2_FETCHMODE_ASSOC);

	foreach ($res as $val) {
	$val = array_change_key_case($val, CASE_LOWER);
	$keys = explode(', ', $val['index_keys']);

	if (sizeof($keys) > 1) {
	foreach ($keys as $key) {
	$this->_add_flag($flags[$key], 'multiple_key');
	}
	}

	if (strpos($val['index_description'], 'primary key')) {
	foreach ($keys as $key) {
	$this->_add_flag($flags[$key], 'primary_key');
	}
	} elseif (strpos($val['index_description'], 'unique')) {
	foreach ($keys as $key) {
	$this->_add_flag($flags[$key], 'unique_key');
	}
	}
	}

	// get auto_increment, not_null and timestamp
	$res = $db->queryAll("EXEC SP_COLUMNS[$table]", null, MDB2_FETCHMODE_ASSOC);

	foreach ($res as $val) {
	$val = array_change_key_case($val, CASE_LOWER);
	if ($val['nullable'] == '0') {
	$this->_add_flag($flags[$val['column_name']], 'not_null');
	}
	if (strpos($val['type_name'], 'identity')) {
	$this->_add_flag($flags[$val['column_name']], 'auto_increment');
	}
	if (strpos($val['type_name'], 'timestamp')) {
	$this->_add_flag($flags[$val['column_name']], 'timestamp');
	}
	}
	}

	if (!empty($flags[$column])) {
	return(implode(' ', $flags[$column]));
	}
	return '';
	}

	// }}}
	// {{{ _add_flag()

	/**
	* Adds a string to the flags array if the flag is not yet in there
	* - if there is no flag present the array is created
	*
	* @param array &$array the reference to the flag-array
	* @param string $value the flag value
	*
	* @return void
	*
	* @access protected
	* @author Joern Barthel <j_barthel@web.de>
	*/
	function _add_flag(&$array, $value)
	{
	if (!is_array($array)) {
	$array = array($value);
	} elseif (!in_array($value, $array)) {
	array_push($array, $value);
	}
	}

	// }}}
	}
	?>

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