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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* The PEAR DB driver for PHP's mssql extension
* for interacting with Microsoft SQL Server databases
*
* PHP versions 4 and 5
*
* LICENSE: This source file is subject to version 3.0 of the PHP license
* that is available through the world-wide-web at the following URI:
* http://www.php.net/license/3_0.txt. If you did not receive a copy of
* the PHP License and are unable to obtain it through the web, please
* send a note to license@php.net so we can mail you a copy immediately.
*
* @category Database
* @package DB
* @author Sterling Hughes <sterling@php.net>
* @author Daniel Convissor <danielc@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.php.net/license/3_0.txt PHP License 3.0
* @version CVS: $Id$
* @link http://pear.php.net/package/DB
*/
/**
* Obtain the DB_common class so it can be extended from
*/
require_once 'DB/common.php';
/**
* The methods PEAR DB uses to interact with PHP's mssql extension
* for interacting with Microsoft SQL Server databases
*
* These methods overload the ones declared in DB_common.
*
* @category Database
* @package DB
* @author Sterling Hughes <sterling@php.net>
* @author Daniel Convissor <danielc@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.php.net/license/3_0.txt PHP License 3.0
* @version Release: @package_version@
* @link http://pear.php.net/package/DB
*/
class DB_mssql extends DB_common
{
// {{{ properties
/**
* The DB driver type (mysql, oci8, odbc, etc.)
* @var string
*/
var $phptype = 'mssql';
/**
* The database syntax variant to be used (db2, access, etc.), if any
* @var string
*/
var $dbsyntax = 'mssql';
/**
* The capabilities of this DB implementation
*
* The 'new_link' element contains the PHP version that first provided
* new_link support for this DBMS. Contains false if it's unsupported.
*
* Meaning of the 'limit' element:
* + 'emulate' = emulate with fetch row by number
* + 'alter' = alter the query
* + false = skip rows
*
* @var array
*/
var $features = array(
'limit' => 'emulate',
'new_link' => false,
'numrows' => true,
'pconnect' => true,
'prepare' => false,
'ssl' => false,
'transactions' => true,
);
/**
* A mapping of native error codes to DB error codes
* @var array
*/
// XXX Add here error codes ie: 'S100E' => DB_ERROR_SYNTAX
var $errorcode_map = array(
110 => DB_ERROR_VALUE_COUNT_ON_ROW,
155 => DB_ERROR_NOSUCHFIELD,
170 => DB_ERROR_SYNTAX,
207 => DB_ERROR_NOSUCHFIELD,
208 => DB_ERROR_NOSUCHTABLE,
245 => DB_ERROR_INVALID_NUMBER,
515 => DB_ERROR_CONSTRAINT_NOT_NULL,
547 => DB_ERROR_CONSTRAINT,
1913 => DB_ERROR_ALREADY_EXISTS,
2627 => DB_ERROR_CONSTRAINT,
2714 => DB_ERROR_ALREADY_EXISTS,
3701 => DB_ERROR_NOSUCHTABLE,
8134 => DB_ERROR_DIVZERO,
);
/**
* The raw database connection created by PHP
* @var resource
*/
var $connection;
/**
* The DSN information for connecting to a database
* @var array
*/
var $dsn = array();
/**
* Should data manipulation queries be committed automatically?
* @var bool
* @access private
*/
var $autocommit = true;
/**
* The quantity of transactions begun
*
* {@internal While this is private, it can't actually be designated
* private in PHP 5 because it is directly accessed in the test suite.}}
*
* @var integer
* @access private
*/
var $transaction_opcount = 0;
/**
* The database specified in the DSN
*
* It's a fix to allow calls to different databases in the same script.
*
* @var string
* @access private
*/
var $_db = null;
// }}}
// {{{ constructor
/**
* This constructor calls <kbd>$this->DB_common()</kbd>
*
* @return void
*/
function DB_mssql()
{
$this->DB_common();
}
// }}}
// {{{ connect()
/**
* Connect to the database server, log in and open the database
*
* Don't call this method directly. Use DB::connect() instead.
*
* @param array $dsn the data source name
* @param bool $persistent should the connection be persistent?
*
* @return int DB_OK on success. A DB_Error object on failure.
*/
function connect($dsn, $persistent = false)
{
if (!PEAR::loadExtension('mssql') && !PEAR::loadExtension('sybase')
&& !PEAR::loadExtension('sybase_ct'))
{
return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
}
$this->dsn = $dsn;
if ($dsn['dbsyntax']) {
$this->dbsyntax = $dsn['dbsyntax'];
}
$params = array(
$dsn['hostspec'] ? $dsn['hostspec'] : 'localhost',
$dsn['username'] ? $dsn['username'] : null,
$dsn['password'] ? $dsn['password'] : null,
);
if ($dsn['port']) {
$params[0] .= ((substr(PHP_OS, 0, 3) == 'WIN') ? ',' : ':')
. $dsn['port'];
}
$connect_function = $persistent ? 'mssql_pconnect' : 'mssql_connect';
$this->connection = @call_user_func_array($connect_function, $params);
if (!$this->connection) {
return $this->raiseError(DB_ERROR_CONNECT_FAILED,
null, null, null,
@mssql_get_last_message());
}
if ($dsn['database']) {
if (!@mssql_select_db($dsn['database'], $this->connection)) {
return $this->raiseError(DB_ERROR_NODBSELECTED,
null, null, null,
@mssql_get_last_message());
}
$this->_db = $dsn['database'];
}
return DB_OK;
}
// }}}
// {{{ disconnect()
/**
* Disconnects from the database server
*
* @return bool TRUE on success, FALSE on failure
*/
function disconnect()
{
$ret = @mssql_close($this->connection);
$this->connection = null;
return $ret;
}
// }}}
// {{{ simpleQuery()
/**
* Sends a query to the database server
*
* @param string the SQL query string
*
* @return mixed + a PHP result resrouce for successful SELECT queries
* + the DB_OK constant for other successful queries
* + a DB_Error object on failure
*/
function simpleQuery($query)
{
$ismanip = DB::isManip($query);
$this->last_query = $query;
if (!@mssql_select_db($this->_db, $this->connection)) {
return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
}
$query = $this->modifyQuery($query);
if (!$this->autocommit && $ismanip) {
if ($this->transaction_opcount == 0) {
$result = @mssql_query('BEGIN TRAN', $this->connection);
if (!$result) {
return $this->mssqlRaiseError();
}
}
$this->transaction_opcount++;
}
$result = @mssql_query($query, $this->connection);
if (!$result) {
return $this->mssqlRaiseError();
}
// Determine which queries that should return data, and which
// should return an error code only.
return $ismanip ? DB_OK : $result;
}
// }}}
// {{{ nextResult()
/**
* Move the internal mssql result pointer to the next available result
*
* @param a valid fbsql result resource
*
* @access public
*
* @return true if a result is available otherwise return false
*/
function nextResult($result)
{
return @mssql_next_result($result);
}
// }}}
// {{{ fetchInto()
/**
* Places a row from the result set into the given array
*
* Formating of the array and the data therein are configurable.
* See DB_result::fetchInto() for more information.
*
* This method is not meant to be called directly. Use
* DB_result::fetchInto() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result the query result resource
* @param array $arr the referenced array to put the data in
* @param int $fetchmode how the resulting array should be indexed
* @param int $rownum the row number to fetch (0 = first row)
*
* @return mixed DB_OK on success, NULL when the end of a result set is
* reached or on failure
*
* @see DB_result::fetchInto()
*/
function fetchInto($result, &$arr, $fetchmode, $rownum = null)
{
if ($rownum !== null) {
if (!@mssql_data_seek($result, $rownum)) {
return null;
}
}
if ($fetchmode & DB_FETCHMODE_ASSOC) {
$arr = @mssql_fetch_array($result, MSSQL_ASSOC);
if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
$arr = array_change_key_case($arr, CASE_LOWER);
}
} else {
$arr = @mssql_fetch_row($result);
}
if (!$arr) {
return null;
}
if ($this->options['portability'] & DB_PORTABILITY_RTRIM) {
$this->_rtrimArrayValues($arr);
}
if ($this->options['portability'] & DB_PORTABILITY_NULL_TO_EMPTY) {
$this->_convertNullArrayValuesToEmpty($arr);
}
return DB_OK;
}
// }}}
// {{{ freeResult()
/**
* Deletes the result set and frees the memory occupied by the result set
*
* This method is not meant to be called directly. Use
* DB_result::free() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result PHP's query result resource
*
* @return bool TRUE on success, FALSE if $result is invalid
*
* @see DB_result::free()
*/
function freeResult($result)
{
return @mssql_free_result($result);
}
// }}}
// {{{ numCols()
/**
* Gets the number of columns in a result set
*
* This method is not meant to be called directly. Use
* DB_result::numCols() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result PHP's query result resource
*
* @return int the number of columns. A DB_Error object on failure.
*
* @see DB_result::numCols()
*/
function numCols($result)
{
$cols = @mssql_num_fields($result);
if (!$cols) {
return $this->mssqlRaiseError();
}
return $cols;
}
// }}}
// {{{ numRows()
/**
* Gets the number of rows in a result set
*
* This method is not meant to be called directly. Use
* DB_result::numRows() instead. It can't be declared "protected"
* because DB_result is a separate object.
*
* @param resource $result PHP's query result resource
*
* @return int the number of rows. A DB_Error object on failure.
*
* @see DB_result::numRows()
*/
function numRows($result)
{
$rows = @mssql_num_rows($result);
if ($rows === false) {
return $this->mssqlRaiseError();
}
return $rows;
}
// }}}
// {{{ autoCommit()
/**
* Enables or disables automatic commits
*
* @param bool $onoff true turns it on, false turns it off
*
* @return int DB_OK on success. A DB_Error object if the driver
* doesn't support auto-committing transactions.
*/
function autoCommit($onoff = false)
{
// XXX if $this->transaction_opcount > 0, we should probably
// issue a warning here.
$this->autocommit = $onoff ? true : false;
return DB_OK;
}
// }}}
// {{{ commit()
/**
* Commits the current transaction
*
* @return int DB_OK on success. A DB_Error object on failure.
*/
function commit()
{
if ($this->transaction_opcount > 0) {
if (!@mssql_select_db($this->_db, $this->connection)) {
return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
}
$result = @mssql_query('COMMIT TRAN', $this->connection);
$this->transaction_opcount = 0;
if (!$result) {
return $this->mssqlRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ rollback()
/**
* Reverts the current transaction
*
* @return int DB_OK on success. A DB_Error object on failure.
*/
function rollback()
{
if ($this->transaction_opcount > 0) {
if (!@mssql_select_db($this->_db, $this->connection)) {
return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
}
$result = @mssql_query('ROLLBACK TRAN', $this->connection);
$this->transaction_opcount = 0;
if (!$result) {
return $this->mssqlRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ affectedRows()
/**
* Determines the number of rows affected by a data maniuplation query
*
* 0 is returned for queries that don't manipulate data.
*
* @return int the number of rows. A DB_Error object on failure.
*/
function affectedRows()
{
if (DB::isManip($this->last_query)) {
$res = @mssql_query('select @@rowcount', $this->connection);
if (!$res) {
return $this->mssqlRaiseError();
}
$ar = @mssql_fetch_row($res);
if (!$ar) {
$result = 0;
} else {
@mssql_free_result($res);
$result = $ar[0];
}
} else {
$result = 0;
}
return $result;
}
// }}}
// {{{ nextId()
/**
* Returns the next free id in a sequence
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true, the seqence is automatically
* created if it does not exist
*
* @return int the next id number in the sequence.
* A DB_Error object on failure.
*
* @see DB_common::nextID(), DB_common::getSequenceName(),
* DB_mssql::createSequence(), DB_mssql::dropSequence()
*/
function nextId($seq_name, $ondemand = true)
{
$seqname = $this->getSequenceName($seq_name);
if (!@mssql_select_db($this->_db, $this->connection)) {
return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
}
$repeat = 0;
do {
$this->pushErrorHandling(PEAR_ERROR_RETURN);
$result = $this->query("INSERT INTO $seqname (vapor) VALUES (0)");
$this->popErrorHandling();
if ($ondemand && DB::isError($result) &&
($result->getCode() == DB_ERROR || $result->getCode() == DB_ERROR_NOSUCHTABLE))
{
$repeat = 1;
$result = $this->createSequence($seq_name);
if (DB::isError($result)) {
return $this->raiseError($result);
}
} elseif (!DB::isError($result)) {
$result =& $this->query("SELECT @@IDENTITY FROM $seqname");
$repeat = 0;
} else {
$repeat = false;
}
} while ($repeat);
if (DB::isError($result)) {
return $this->raiseError($result);
}
$result = $result->fetchRow(DB_FETCHMODE_ORDERED);
return $result[0];
}
/**
* Creates a new sequence
*
* @param string $seq_name name of the new sequence
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::createSequence(), DB_common::getSequenceName(),
* DB_mssql::nextID(), DB_mssql::dropSequence()
*/
function createSequence($seq_name)
{
return $this->query('CREATE TABLE '
. $this->getSequenceName($seq_name)
. ' ([id] [int] IDENTITY (1, 1) NOT NULL,'
. ' [vapor] [int] NULL)');
}
// }}}
// {{{ dropSequence()
/**
* Deletes a sequence
*
* @param string $seq_name name of the sequence to be deleted
*
* @return int DB_OK on success. A DB_Error object on failure.
*
* @see DB_common::dropSequence(), DB_common::getSequenceName(),
* DB_mssql::nextID(), DB_mssql::createSequence()
*/
function dropSequence($seq_name)
{
return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));
}
// }}}
// {{{ quoteIdentifier()
/**
* Quotes a string so it can be safely used as a table or column name
*
* @param string $str identifier name to be quoted
*
* @return string quoted identifier string
*
* @see DB_common::quoteIdentifier()
* @since Method available since Release 1.6.0
*/
function quoteIdentifier($str)
{
return '[' . str_replace(']', ']]', $str) . ']';
}
// }}}
// {{{ mssqlRaiseError()
/**
* Produces a DB_Error object regarding the current problem
*
* @param int $errno if the error is being manually raised pass a
* DB_ERROR* constant here. If this isn't passed
* the error information gathered from the DBMS.
*
* @return object the DB_Error object
*
* @see DB_common::raiseError(),
* DB_mssql::errorNative(), DB_mssql::errorCode()
*/
function mssqlRaiseError($code = null)
{
$message = @mssql_get_last_message();
if (!$code) {
$code = $this->errorNative();
}
return $this->raiseError($this->errorCode($code, $message),
null, null, null, "$code - $message");
}
// }}}
// {{{ errorNative()
/**
* Gets the DBMS' native error code produced by the last query
*
* @return int the DBMS' error code
*/
function errorNative()
{
$res = @mssql_query('select @@ERROR as ErrorCode', $this->connection);
if (!$res) {
return DB_ERROR;
}
$row = @mssql_fetch_row($res);
return $row[0];
}
// }}}
// {{{ errorCode()
/**
* Determines PEAR::DB error code from mssql's native codes.
*
* If <var>$nativecode</var> isn't known yet, it will be looked up.
*
* @param mixed $nativecode mssql error code, if known
* @return integer an error number from a DB error constant
* @see errorNative()
*/
function errorCode($nativecode = null, $msg = '')
{
if (!$nativecode) {
$nativecode = $this->errorNative();
}
if (isset($this->errorcode_map[$nativecode])) {
if ($nativecode == 3701
&& preg_match('/Cannot drop the index/i', $msg))
{
return DB_ERROR_NOT_FOUND;
}
return $this->errorcode_map[$nativecode];
} else {
return DB_ERROR;
}
}
// }}}
// {{{ 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 DB_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 $mode a valid tableInfo mode
*
* @return array an associative array with the information requested.
* A DB_Error object on failure.
*
* @see DB_common::tableInfo()
*/
function tableInfo($result, $mode = null)
{
if (is_string($result)) {
/*
* Probably received a table name.
* Create a result resource identifier.
*/
if (!@mssql_select_db($this->_db, $this->connection)) {
return $this->mssqlRaiseError(DB_ERROR_NODBSELECTED);
}
$id = @mssql_query("SELECT * FROM $result WHERE 1=0",
$this->connection);
$got_string = true;
} elseif (isset($result->result)) {
/*
* Probably received a result object.
* Extract the result resource identifier.
*/
$id = $result->result;
$got_string = false;
} else {
/*
* Probably received a result resource identifier.
* Copy it.
* Deprecated. Here for compatibility only.
*/
$id = $result;
$got_string = false;
}
if (!is_resource($id)) {
return $this->mssqlRaiseError(DB_ERROR_NEED_MORE_DATA);
}
if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
$case_func = 'strtolower';
} else {
$case_func = 'strval';
}
$count = @mssql_num_fields($id);
$res = array();
if ($mode) {
$res['num_fields'] = $count;
}
for ($i = 0; $i < $count; $i++) {
$res[$i] = array(
'table' => $got_string ? $case_func($result) : '',
'name' => $case_func(@mssql_field_name($id, $i)),
'type' => @mssql_field_type($id, $i),
'len' => @mssql_field_length($id, $i),
// We only support flags for table
'flags' => $got_string
? $this->_mssql_field_flags($result,
@mssql_field_name($id, $i))
: '',
);
if ($mode & DB_TABLEINFO_ORDER) {
$res['order'][$res[$i]['name']] = $i;
}
if ($mode & DB_TABLEINFO_ORDERTABLE) {
$res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;
}
}
// free the result only if we were called on a table
if ($got_string) {
@mssql_free_result($id);
}
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 $column the field name
*
* @return string the flags
*
* @access private
* @author Joern Barthel <j_barthel@web.de>
*/
function _mssql_field_flags($table, $column)
{
static $tableName = null;
static $flags = array();
if ($table != $tableName) {
$flags = array();
$tableName = $table;
// get unique and primary keys
$res = $this->getAll("EXEC SP_HELPINDEX[$table]", DB_FETCHMODE_ASSOC);
foreach ($res as $val) {
$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 = $this->getAll("EXEC SP_COLUMNS[$table]", DB_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[$val['column_name']], 'timestamp');
}
}
}
if (array_key_exists($column, $flags)) {
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 $value the flag value
*
* @return void
*
* @access private
* @author Joern Barthel <j_barthel@web.de>
*/
function _add_flag(&$array, $value)
{
if (!is_array($array)) {
$array = array($value);
} elseif (!in_array($value, $array)) {
array_push($array, $value);
}
}
// }}}
// {{{ getSpecialQuery()
/**
* Obtains the query string needed for listing a given type of objects
*
* @param string $type the kind of objects you want to retrieve
*
* @return string the SQL query string or null if the driver doesn't
* support the object type requested
*
* @access protected
* @see DB_common::getListOf()
*/
function getSpecialQuery($type)
{
switch ($type) {
case 'tables':
return "SELECT name FROM sysobjects WHERE type = 'U'"
. ' ORDER BY name';
case 'views':
return "SELECT name FROM sysobjects WHERE type = 'V'";
default:
return null;
}
}
// }}}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
?>

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