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<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**

 * The PEAR DB driver for PHP's sybase extension

 * for interacting with Sybase 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     Antônio Carlos Venâncio Júnior <floripa@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: sybase.php,v 1.78 2005/02/20 00:44:48 danielc Exp $

 * @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 sybase extension

 * for interacting with Sybase databases

 *

 * These methods overload the ones declared in DB_common.

 *

 * WARNING:  This driver may fail with multiple connections under the

 * same user/pass/host and different databases.

 *

 * @category   Database

 * @package    DB

 * @author     Sterling Hughes <sterling@php.net>

 * @author     Antônio Carlos Venâncio Júnior <floripa@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: 1.7.6

 * @link       http://pear.php.net/package/DB

 */

class DB_sybase extends DB_common

{

    // {{{ properties

    /**

     * The DB driver type (mysql, oci8, odbc, etc.)

     * @var string

     */

    var $phptype = 'sybase';

    /**

     * The database syntax variant to be used (db2, access, etc.), if any

     * @var string

     */

    var $dbsyntax = 'sybase';

    /**

     * 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

     */

    var $errorcode_map = array(

    );

    /**

     * 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 = '';

    // }}}

    // {{{ constructor

    /**

     * This constructor calls <kbd>$this->DB_common()</kbd>

     *

     * @return void

     */

    function DB_sybase()

    {

        $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.

     *

     * PEAR DB's sybase driver supports the following extra DSN options:

     *   + appname       The application name to use on this connection.

     *                   Available since PEAR DB 1.7.0.

     *   + charset       The character set to use on this connection.

     *                   Available since PEAR DB 1.7.0.

     *

     * @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('sybase') &&

            !PEAR::loadExtension('sybase_ct'))

        {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

            $this->dbsyntax = $dsn['dbsyntax'];

        }

        $dsn['hostspec'] = $dsn['hostspec'] ? $dsn['hostspec'] : 'localhost';

        $dsn['password'] = !empty($dsn['password']) ? $dsn['password'] : false;

        $dsn['charset'] = isset($dsn['charset']) ? $dsn['charset'] : false;

        $dsn['appname'] = isset($dsn['appname']) ? $dsn['appname'] : false;

        $connect_function = $persistent ? 'sybase_pconnect' : 'sybase_connect';

        if ($dsn['username']) {

            $this->connection = @$connect_function($dsn['hostspec'],

                                                   $dsn['username'],

                                                   $dsn['password'],

                                                   $dsn['charset'],

                                                   $dsn['appname']);

        } else {

            return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                     null, null, null,

                                     'The DSN did not contain a username.');

        }

        if (!$this->connection) {

            return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                     null, null, null,

                                     @sybase_get_last_message());

        }

        if ($dsn['database']) {

            if (!@sybase_select_db($dsn['database'], $this->connection)) {

                return $this->raiseError(DB_ERROR_NODBSELECTED,

                                         null, null, null,

                                         @sybase_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()

    {

        $ret = @sybase_close($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 (!@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)) {

            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()

    /**

     * 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 (!@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) {

            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 @sybase_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)

    {

        $cols = @sybase_num_fields($result);

        if (!$cols) {

            return $this->sybaseRaiseError();

        }

        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)

    {

        $rows = @sybase_num_rows($result);

        if ($rows === false) {

            return $this->sybaseRaiseError();

        }

        return $rows;

    }

    // }}}

    // {{{ 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)) {

            $result = @sybase_affected_rows($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.

     *               A DB_Error object on failure.

     *

     * @see DB_common::nextID(), DB_common::getSequenceName(),

     *      DB_sybase::createSequence(), DB_sybase::dropSequence()

     */

    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 on failure.

     *

     * @see DB_common::createSequence(), DB_common::getSequenceName(),

     *      DB_sybase::nextID(), DB_sybase::dropSequence()

     */

    function createSequence($seq_name)

    {

        return $this->query('CREATE TABLE '

                            . $this->getSequenceName($seq_name)

                            . ' (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.  A DB_Error object on failure.

     *

     * @see DB_common::dropSequence(), DB_common::getSequenceName(),

     *      DB_sybase::nextID(), DB_sybase::createSequence()

     */

    function dropSequence($seq_name)

    {

        return $this->query('DROP TABLE ' . $this->getSequenceName($seq_name));

    }

    // }}}

    // {{{ 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 (!@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()

    /**

     * Reverts the current transaction

     *

     * @return int  DB_OK on success.  A DB_Error object on failure.

     */

    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;

    }

    // }}}

    // {{{ sybaseRaiseError()

    /**

     * 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_sybase::errorNative(), DB_sybase::errorCode()

     */

    function sybaseRaiseError($errno = null)

    {

        $native = $this->errorNative();

        if ($errno === null) {

            $errno = $this->errorCode($native);

        }

        return $this->raiseError($errno, null, null, null, $native);

    }

    // }}}

    // {{{ errorNative()

    /**

     * Gets the DBMS' native error message produced by the last query

     *

     * @return string  the DBMS' error message

     */

    function errorNative()

    {

        return @sybase_get_last_message();

    }

    // }}}

    // {{{ errorCode()

    /**

     * Determines 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|of NUMERIC value)/i'

                    => 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,

                '/^Cannot drop the index .* because it doesn\'t exist/i'

                    => DB_ERROR_NOT_FOUND,

                '/^There is already an index/i'

                    => DB_ERROR_ALREADY_EXISTS,

                '/^There are fewer columns in the INSERT statement than values specified/i'

                    => DB_ERROR_VALUE_COUNT_ON_ROW,

            );

        }

        foreach ($error_regexps as $regexp => $code) {

            if (preg_match($regexp, $errormsg)) {

                return $code;

            }

        }

        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()

     * @since Method available since Release 1.6.0

     */

    function tableInfo($result, $mode = null)

    {

        if (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;

        } 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->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);

        $res   = array();

        if ($mode) {

            $res['num_fields'] = $count;

        }

        for ($i = 0; $i < $count; $i++) {

            $f = @sybase_fetch_field($id, $i);

            // column_source is often blank

            $res[$i] = array(

                'table' => $got_string

                           ? $case_func($result)

                           : $case_func($f->column_source),

                'name'  => $case_func($f->name),

                'type'  => $f->type,

                'len'   => $f->max_length,

                'flags' => '',

            );

            if ($res[$i]['table']) {

                $res[$i]['flags'] = $this->_sybase_field_flags(

                        $res[$i]['table'], $res[$i]['name']);

            }

            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   the table name

     * @param string  $column  the 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

     *

     * @return void

     *

     * @access private

     */

    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:

 */

?>