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sybase.php
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2004-10-01
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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 foldmethod=marker: */
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Sterling Hughes <sterling@php.net> |
// | Ant⌠nio Carlos VenΓncio J·nior <floripa@php.net> |
// | Maintainer: Daniel Convissor <danielc@php.net> |
// +----------------------------------------------------------------------+
//
// $Id: sybase.php,v 1.52 2004/07/12 19:07:34 danielc Exp $
// TODO
// - This driver may fail with multiple connections under the same
// user/pass/host and different databases
require_once 'DB/common.php';
/**
* Database independent query interface definition for PHP's Sybase
* extension.
*
* @package DB
* @version $Id: sybase.php,v 1.52 2004/07/12 19:07:34 danielc Exp $
* @category Database
* @author Sterling Hughes <sterling@php.net>
* @author Ant⌠nio Carlos VenΓncio J·nior <floripa@php.net>
*/
class DB_sybase extends DB_common
{
// {{{ properties
var $connection;
var $phptype, $dbsyntax;
var $prepare_tokens = array();
var $prepare_types = array();
var $transaction_opcount = 0;
var $autocommit = true;
// }}}
// {{{ constructor
/**
* DB_sybase constructor.
*
* @access public
*/
function DB_sybase()
{
$this->DB_common();
$this->phptype = 'sybase';
$this->dbsyntax = 'sybase';
$this->features = array(
'prepare' => false,
'pconnect' => true,
'transactions' => false,
'limit' => 'emulate'
);
$this->errorcode_map = array(
);
}
// }}}
// {{{ connect()
/**
* Connect to a database and log in as the specified user.
*
* @param $dsn the data source name (see DB::parseDSN for syntax)
* @param $persistent (optional) whether the connection should
* be persistent
* @access public
* @return int DB_OK on success, a DB error on failure
*/
function connect($dsninfo, $persistent = false)
{
if (!DB::assertExtension('sybase') &&
!DB::assertExtension('sybase_ct'))
{
return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
}
$this->dsn = $dsninfo;
$interface = $dsninfo['hostspec'] ? $dsninfo['hostspec'] : 'localhost';
$connect_function = $persistent ? 'sybase_pconnect' : 'sybase_connect';
$dsninfo['password'] = !empty($dsninfo['password']) ? $dsninfo['password'] : false;
$dsninfo['charset'] = isset($dsninfo['charset']) ? $dsninfo['charset'] : false;
$dsninfo['appname'] = isset($dsninfo['appname']) ? $dsninfo['appname'] : false;
if ($interface && $dsninfo['username']) {
$conn = @$connect_function($interface, $dsninfo['username'],
$dsninfo['password'],
$dsninfo['charset'],
$dsninfo['appname']);
} else {
$conn = false;
}
if (!$conn) {
return $this->raiseError(DB_ERROR_CONNECT_FAILED);
}
if ($dsninfo['database']) {
if (!@sybase_select_db($dsninfo['database'], $conn)) {
return $this->raiseError(DB_ERROR_NODBSELECTED, null,
null, null, @sybase_get_last_message());
}
$this->_db = $dsninfo['database'];
}
$this->connection = $conn;
return DB_OK;
}
// }}}
// {{{ disconnect()
/**
* Log out and disconnect from the database.
*
* @access public
*
* @return bool true on success, false if not connected.
*/
function disconnect()
{
$ret = @sybase_close($this->connection);
$this->connection = null;
return $ret;
}
// }}}
// {{{ errorNative()
/**
* Get the last server error messge (if any)
*
* @return string sybase last error message
*/
function errorNative()
{
return @sybase_get_last_message();
}
// }}}
// {{{ errorCode()
/**
* Determine PEAR::DB error code from the database's text error message.
*
* @param string $errormsg error message returned from the database
* @return integer an error number from a DB error constant
*/
function errorCode($errormsg)
{
static $error_regexps;
if (!isset($error_regexps)) {
$error_regexps = array(
'/Incorrect syntax near/'
=> DB_ERROR_SYNTAX,
'/^Unclosed quote before the character string [\"\'].*[\"\']\./'
=> DB_ERROR_SYNTAX,
'/Implicit conversion from datatype [\"\'].+[\"\'] to [\"\'].+[\"\'] is not allowed\./'
=> DB_ERROR_INVALID_NUMBER,
'/Cannot drop the table [\"\'].+[\"\'], because it doesn\'t exist in the system catalogs\./'
=> DB_ERROR_NOSUCHTABLE,
'/Only the owner of object [\"\'].+[\"\'] or a user with System Administrator \(SA\) role can run this command\./'
=> DB_ERROR_ACCESS_VIOLATION,
'/^.+ permission denied on object .+, database .+, owner .+/'
=> DB_ERROR_ACCESS_VIOLATION,
'/^.* permission denied, database .+, owner .+/'
=> DB_ERROR_ACCESS_VIOLATION,
'/[^.*] not found\./'
=> DB_ERROR_NOSUCHTABLE,
'/There is already an object named/'
=> DB_ERROR_ALREADY_EXISTS,
'/Invalid column name/'
=> DB_ERROR_NOSUCHFIELD,
'/does not allow null values/'
=> DB_ERROR_CONSTRAINT_NOT_NULL,
'/Command has been aborted/'
=> DB_ERROR_CONSTRAINT,
);
}
foreach ($error_regexps as $regexp => $code) {
if (preg_match($regexp, $errormsg)) {
return $code;
}
}
return DB_ERROR;
}
// }}}
// {{{ sybaseRaiseError()
/**
* Gather information about an error, then use that info to create a
* DB error object and finally return that object.
*
* @param integer $errno PEAR error number (usually a DB constant) if
* manually raising an error
* @return object DB error object
* @see errorNative()
* @see errorCode()
* @see DB_common::raiseError()
*/
function sybaseRaiseError($errno = null)
{
$native = $this->errorNative();
if ($errno === null) {
$errno = $this->errorCode($native);
}
return $this->raiseError($errno, null, null, null, $native);
}
// }}}
// {{{ simpleQuery()
/**
* Send a query to Sybase and return the results as a Sybase resource
* identifier.
*
* @param the SQL query
*
* @access public
*
* @return mixed returns a valid Sybase result for successful SELECT
* queries, DB_OK for other successful queries. A DB error is
* returned on failure.
*/
function simpleQuery($query)
{
$ismanip = DB::isManip($query);
$this->last_query = $query;
if (!@sybase_select_db($this->_db, $this->connection)) {
return $this->sybaseRaiseError(DB_ERROR_NODBSELECTED);
}
$query = $this->modifyQuery($query);
if (!$this->autocommit && $ismanip) {
if ($this->transaction_opcount == 0) {
$result = @sybase_query('BEGIN TRANSACTION', $this->connection);
if (!$result) {
return $this->sybaseRaiseError();
}
}
$this->transaction_opcount++;
}
$result = @sybase_query($query, $this->connection);
if (!$result) {
return $this->sybaseRaiseError();
}
if (is_resource($result)) {
$numrows = $this->numRows($result);
if (is_object($numrows)) {
return $numrows;
}
$this->num_rows[(int)$result] = $numrows;
return $result;
}
// Determine which queries that should return data, and which
// should return an error code only.
return $ismanip ? DB_OK : $result;
}
// }}}
// {{{ nextResult()
/**
* Move the internal sybase result pointer to the next available result
*
* @param a valid sybase result resource
*
* @access public
*
* @return true if a result is available otherwise return false
*/
function nextResult($result)
{
return false;
}
// }}}
// {{{ fetchInto()
/**
* Fetch a row and insert the data into an existing array.
*
* Formating of the array and the data therein are configurable.
* See DB_result::fetchInto() for more information.
*
* @param resource $result query result identifier
* @param array $arr (reference) array where data from the row
* should be placed
* @param int $fetchmode how the resulting array should be indexed
* @param int $rownum the row number to fetch
*
* @return mixed DB_OK on success, null when end of result set is
* reached or on failure
*
* @see DB_result::fetchInto()
* @access private
*/
function fetchInto($result, &$arr, $fetchmode, $rownum=null)
{
if ($rownum !== null) {
if (!@sybase_data_seek($result, $rownum)) {
return null;
}
}
if ($fetchmode & DB_FETCHMODE_ASSOC) {
if (function_exists('sybase_fetch_assoc')) {
$arr = @sybase_fetch_assoc($result);
} else {
if ($arr = @sybase_fetch_array($result)) {
foreach ($arr as $key => $value) {
if (is_int($key)) {
unset($arr[$key]);
}
}
}
}
if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE && $arr) {
$arr = array_change_key_case($arr, CASE_LOWER);
}
} else {
$arr = @sybase_fetch_row($result);
}
if (!$arr) {
// reported not work as seems that sybase_get_last_message()
// always return a message here
//if ($errmsg = @sybase_get_last_message()) {
// return $this->sybaseRaiseError($errmsg);
//} else {
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()
/**
* Free the internal resources associated with $result.
*
* @param $result Sybase result identifier
*
* @access public
*
* @return bool true on success, false if $result is invalid
*/
function freeResult($result)
{
unset($this->num_rows[(int)$result]);
return @sybase_free_result($result);
}
// }}}
// {{{ numCols()
/**
* Get the number of columns in a result set.
*
* @param $result Sybase result identifier
*
* @access public
*
* @return int the number of columns per row in $result
*/
function numCols($result)
{
$cols = @sybase_num_fields($result);
if (!$cols) {
return $this->sybaseRaiseError();
}
return $cols;
}
// }}}
// {{{ numRows()
/**
* Get the number of rows in a result set.
*
* @param $result Sybase result identifier
*
* @access public
*
* @return int the number of rows in $result
*/
function numRows($result)
{
$rows = @sybase_num_rows($result);
if ($rows === false) {
return $this->sybaseRaiseError();
}
return $rows;
}
// }}}
// {{{ affectedRows()
/**
* Gets the number of rows affected by the data manipulation
* query. For other queries, this function returns 0.
*
* @return number of rows affected by the last query
*/
function affectedRows()
{
if (DB::isManip($this->last_query)) {
$result = @sybase_affected_rows($this->connection);
} else {
$result = 0;
}
return $result;
}
// }}}
// {{{ nextId()
/**
* Returns the next free id in a sequence
*
* @param string $seq_name name of the sequence
* @param boolean $ondemand when true, the seqence is automatically
* created if it does not exist
*
* @return int the next id number in the sequence. DB_Error if problem.
*
* @internal
* @see DB_common::nextID()
* @access public
*/
function nextId($seq_name, $ondemand = true)
{
$seqname = $this->getSequenceName($seq_name);
if (!@sybase_select_db($this->_db, $this->connection)) {
return $this->sybaseRaiseError(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 $seq_name name of the new sequence
*
* @return int DB_OK on success. A DB_Error object is returned if
* problems arise.
*
* @internal
* @see DB_common::createSequence()
* @access public
*/
function createSequence($seq_name)
{
$seqname = $this->getSequenceName($seq_name);
return $this->query("CREATE TABLE $seqname ".
'(id numeric(10,0) IDENTITY NOT NULL ,' .
'vapor int NULL)');
}
// }}}
// {{{ dropSequence()
/**
* Deletes a sequence
*
* @param string $seq_name name of the sequence to be deleted
*
* @return int DB_OK on success. DB_Error if problems.
*
* @internal
* @see DB_common::dropSequence()
* @access public
*/
function dropSequence($seq_name)
{
$seqname = $this->getSequenceName($seq_name);
return $this->query("DROP TABLE $seqname");
}
// }}}
// {{{ getSpecialQuery()
/**
* Returns the query needed to get some backend info
* @param string $type What kind of info you want to retrieve
* @return string The SQL query string
*/
function getSpecialQuery($type)
{
switch ($type) {
case 'tables':
return "select name from sysobjects where type = 'U' order by name";
case 'views':
return "select name from sysobjects where type = 'V'";
default:
return null;
}
}
// }}}
// {{{ autoCommit()
/**
* Enable/disable automatic commits
*/
function autoCommit($onoff = false)
{
// XXX if $this->transaction_opcount > 0, we should probably
// issue a warning here.
$this->autocommit = $onoff ? true : false;
return DB_OK;
}
// }}}
// {{{ commit()
/**
* Commit the current transaction.
*/
function commit()
{
if ($this->transaction_opcount > 0) {
if (!@sybase_select_db($this->_db, $this->connection)) {
return $this->sybaseRaiseError(DB_ERROR_NODBSELECTED);
}
$result = @sybase_query('COMMIT', $this->connection);
$this->transaction_opcount = 0;
if (!$result) {
return $this->sybaseRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ rollback()
/**
* Roll back (undo) the current transaction.
*/
function rollback()
{
if ($this->transaction_opcount > 0) {
if (!@sybase_select_db($this->_db, $this->connection)) {
return $this->sybaseRaiseError(DB_ERROR_NODBSELECTED);
}
$result = @sybase_query('ROLLBACK', $this->connection);
$this->transaction_opcount = 0;
if (!$result) {
return $this->sybaseRaiseError();
}
}
return DB_OK;
}
// }}}
// {{{ tableInfo()
/**
* Returns information about a table or a result set.
*
* NOTE: only supports 'table' and 'flags' if <var>$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
* @param int $mode a valid tableInfo mode
* @return array an associative array with the information requested
* or an error object if something is wrong
* @access public
* @internal
* @since 1.6.0
* @see DB_common::tableInfo()
*/
function tableInfo($result, $mode = null)
{
if (isset($result->result)) {
/*
* Probably received a result object.
* Extract the result resource identifier.
*/
$id = $result->result;
$got_string = false;
} elseif (is_string($result)) {
/*
* Probably received a table name.
* Create a result resource identifier.
*/
if (!@sybase_select_db($this->_db, $this->connection)) {
return $this->sybaseRaiseError(DB_ERROR_NODBSELECTED);
}
$id = @sybase_query("SELECT * FROM $result WHERE 1=0",
$this->connection);
$got_string = true;
} else {
/*
* Probably received a result resource identifier.
* Copy it.
* Deprecated. Here for compatibility only.
*/
$id = $result;
$got_string = false;
}
if (!is_resource($id)) {
return $this->sybaseRaiseError(DB_ERROR_NEED_MORE_DATA);
}
if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE) {
$case_func = 'strtolower';
} else {
$case_func = 'strval';
}
$count = @sybase_num_fields($id);
// made this IF due to performance (one if is faster than $count if's)
if (!$mode) {
for ($i=0; $i<$count; $i++) {
$f = @sybase_fetch_field($id, $i);
// column_source is often blank
if ($got_string) {
$res[$i]['table'] = $case_func($result);
} else {
$res[$i]['table'] = $case_func($f->column_source);
}
$res[$i]['name'] = $case_func($f->name);
$res[$i]['type'] = $f->type;
$res[$i]['len'] = $f->max_length;
if ($res[$i]['table']) {
$res[$i]['flags'] = $this->_sybase_field_flags(
$res[$i]['table'], $res[$i]['name']);
} else {
$res[$i]['flags'] = '';
}
}
} else {
// get full info
$res['num_fields'] = $count;
for ($i=0; $i<$count; $i++) {
$f = @sybase_fetch_field($id, $i);
// column_source is often blank
if ($got_string) {
$res[$i]['table'] = $case_func($result);
} else {
$res[$i]['table'] = $case_func($f->column_source);
}
$res[$i]['name'] = $case_func($f->name);
$res[$i]['type'] = $f->type;
$res[$i]['len'] = $f->max_length;
if ($res[$i]['table']) {
$res[$i]['flags'] = $this->_sybase_field_flags(
$res[$i]['table'], $res[$i]['name']);
} else {
$res[$i]['flags'] = '';
}
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) {
@sybase_free_result($id);
}
return $res;
}
// }}}
// {{{ _sybase_field_flags()
/**
* Get the flags for a field.
*
* Currently supports:
* + <samp>unique_key</samp> (unique index, unique check or primary_key)
* + <samp>multiple_key</samp> (multi-key index)
*
* @param string $table table name
* @param string $column field name
* @return string space delimited string of flags. Empty string if none.
* @access private
*/
function _sybase_field_flags($table, $column)
{
static $tableName = null;
static $flags = array();
if ($table != $tableName) {
$flags = array();
$tableName = $table;
// get unique/primary keys
$res = $this->getAll("sp_helpindex $table", DB_FETCHMODE_ASSOC);
if (!isset($res[0]['index_description'])) {
return '';
}
foreach ($res as $val) {
$keys = explode(', ', trim($val['index_keys']));
if (sizeof($keys) > 1) {
foreach ($keys as $key) {
$this->_add_flag($flags[$key], 'multiple_key');
}
}
if (strpos($val['index_description'], 'unique')) {
foreach ($keys as $key) {
$this->_add_flag($flags[$key], 'unique_key');
}
}
}
}
if (array_key_exists($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 reference of flags array to add a value to
* @param mixed $value value to add to the flag array
* @access private
*/
function _add_flag(&$array, $value)
{
if (!is_array($array)) {
$array = array($value);
} elseif (!in_array($value, $array)) {
array_push($array, $value);
}
}
// }}}
// {{{ quoteIdentifier()
/**
* Quote a string so it can be safely used as a table / column name
*
* Quoting style depends on which database driver is being used.
*
* @param string $str identifier name to be quoted
*
* @return string quoted identifier string
*
* @since 1.6.0
* @access public
*/
function quoteIdentifier($str)
{
return '[' . str_replace(']', ']]', $str) . ']';
}
// }}}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
*/
?>