/common/libraries/plugin/pear/MDB2/Driver/oci8.php

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<?php

// vim: set et ts=4 sw=4 fdm=marker:

// +----------------------------------------------------------------------+

// | PHP versions 4 and 5                                                 |

// +----------------------------------------------------------------------+

// | Copyright (c) 1998-2008 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.                                          |

// +----------------------------------------------------------------------+

// | Author: Lukas Smith <smith@pooteeweet.org>                           |

// +----------------------------------------------------------------------+



// $Id: oci8.php 137 2009-11-09 13:24:37Z vanpouckesven $



/**

 * MDB2 OCI8 driver

 *

 * @package MDB2

 * @category Database

 * @author Lukas Smith <smith@pooteeweet.org>

 */

class MDB2_Driver_oci8 extends MDB2_Driver_Common

{

    // {{{ properties

    var $string_quoting = array('start' => "'", 'end' => "'", 'escape' => "'", 'escape_pattern' => '@');



    var $identifier_quoting = array('start' => '"', 'end' => '"', 'escape' => '"');



    var $uncommitedqueries = 0;

    // }}}

    // {{{ constructor



    /**

     * Constructor

     */

    function __construct()

    {

        parent :: __construct();



        $this->phptype = 'oci8';

        $this->dbsyntax = 'oci8';



        $this->supported['sequences'] = true;

        $this->supported['indexes'] = true;

        $this->supported['summary_functions'] = true;

        $this->supported['order_by_text'] = true;

        $this->supported['current_id'] = true;

        $this->supported['affected_rows'] = true;

        $this->supported['transactions'] = true;

        $this->supported['savepoints'] = true;

        $this->supported['limit_queries'] = true;

        $this->supported['LOBs'] = true;

        $this->supported['replace'] = 'emulated';

        $this->supported['sub_selects'] = true;

        $this->supported['triggers'] = true;

        $this->supported['auto_increment'] = false; // implementation is broken

        $this->supported['primary_key'] = true;

        $this->supported['result_introspection'] = true;

        $this->supported['prepared_statements'] = true;

        $this->supported['identifier_quoting'] = true;

        $this->supported['pattern_escaping'] = true;

        $this->supported['new_link'] = true;



        $this->options['DBA_username'] = false;

        $this->options['DBA_password'] = false;

        $this->options['database_name_prefix'] = false;

        $this->options['emulate_database'] = true;

        $this->options['default_tablespace'] = false;

        $this->options['default_text_field_length'] = 2000;

        $this->options['lob_allow_url_include'] = false;

        $this->options['result_prefetching'] = false;

        $this->options['max_identifiers_length'] = 30;

    }



    // }}}

    // {{{ errorInfo()



    /**

     * This method is used to collect information about an error

     *

     * @param integer $error

     * @return array

     * @access public

     */

    function errorInfo($error = null)

    {

        if (is_resource($error)) {

            $error_data = @OCIError($error);

            $error = null;

        } elseif ($this->connection) {

            $error_data = @OCIError($this->connection);

        } else {

            $error_data = @OCIError();

        }

        $native_code = $error_data['code'];

        $native_msg  = $error_data['message'];

        if (is_null($error)) {

            static $ecode_map;

            if (empty($ecode_map)) {

                $ecode_map = array(

                    1    => MDB2_ERROR_CONSTRAINT,

                    900  => MDB2_ERROR_SYNTAX,

                    904  => MDB2_ERROR_NOSUCHFIELD,

                    911  => MDB2_ERROR_SYNTAX, //invalid character

                    913  => MDB2_ERROR_VALUE_COUNT_ON_ROW,

                    921  => MDB2_ERROR_SYNTAX,

                    923  => MDB2_ERROR_SYNTAX,

                    942  => MDB2_ERROR_NOSUCHTABLE,

                    955  => MDB2_ERROR_ALREADY_EXISTS,

                    1400 => MDB2_ERROR_CONSTRAINT_NOT_NULL,

                    1401 => MDB2_ERROR_INVALID,

                    1407 => MDB2_ERROR_CONSTRAINT_NOT_NULL,

                    1418 => MDB2_ERROR_NOT_FOUND,

                    1435 => MDB2_ERROR_NOT_FOUND,

                    1476 => MDB2_ERROR_DIVZERO,

                    1722 => MDB2_ERROR_INVALID_NUMBER,

                    2289 => MDB2_ERROR_NOSUCHTABLE,

                    2291 => MDB2_ERROR_CONSTRAINT,

                    2292 => MDB2_ERROR_CONSTRAINT,

                    2449 => MDB2_ERROR_CONSTRAINT,

                    24344 => MDB2_ERROR_SYNTAX, //success with compilation error

                );

            }

            if (isset($ecode_map[$native_code])) {

                $error = $ecode_map[$native_code];

            }

        }

        return array($error, $native_code, $native_msg);

    }



    // }}}

    // {{{ beginTransaction()



    /**

     * Start a transaction or set a savepoint.

     *

     * @param   string  name of a savepoint to set

     * @return  mixed   MDB2_OK on success, a MDB2 error on failure

     *

     * @access  public

     */

    function beginTransaction($savepoint = null)

    {

        $this->debug('Starting transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));

        if (!is_null($savepoint)) {

            if (!$this->in_transaction) {

                return $this->raiseError(MDB2_ERROR_INVALID, null, null,

                    'savepoint cannot be released when changes are auto committed', __FUNCTION__);

            }

            $query = 'SAVEPOINT '.$savepoint;

            return $this->_doQuery($query, true);

        } elseif ($this->in_transaction) {

            return MDB2_OK;  //nothing to do

        }

        if (!$this->destructor_registered && $this->opened_persistent) {

            $this->destructor_registered = true;

            register_shutdown_function('MDB2_closeOpenTransactions');

        }

        $this->in_transaction = true;

        ++$this->uncommitedqueries;

        return MDB2_OK;

    }



    // }}}

    // {{{ commit()



    /**

     * Commit the database changes done during a transaction that is in

     * progress or release a savepoint. This function may only be called when

     * auto-committing is disabled, otherwise it will fail. Therefore, a new

     * transaction is implicitly started after committing the pending changes.

     *

     * @param   string  name of a savepoint to release

     * @return  mixed   MDB2_OK on success, a MDB2 error on failure

     *

     * @access  public

     */

    function commit($savepoint = null)

    {

        $this->debug('Committing transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));

        if (!$this->in_transaction) {

            return $this->raiseError(MDB2_ERROR_INVALID, null, null,

                'commit/release savepoint cannot be done changes are auto committed', __FUNCTION__);

        }

        if (!is_null($savepoint)) {

            return MDB2_OK;

        }



        if ($this->uncommitedqueries) {

            $connection = $this->getConnection();

            if (PEAR::isError($connection)) {

                return $connection;

            }

            if (!@OCICommit($connection)) {

                return $this->raiseError(null, null, null,

                'Unable to commit transaction', __FUNCTION__);

            }

            $this->uncommitedqueries = 0;

        }

        $this->in_transaction = false;

        return MDB2_OK;

    }



    // }}}

    // {{{ rollback()



    /**

     * Cancel any database changes done during a transaction or since a specific

     * savepoint that is in progress. This function may only be called when

     * auto-committing is disabled, otherwise it will fail. Therefore, a new

     * transaction is implicitly started after canceling the pending changes.

     *

     * @param   string  name of a savepoint to rollback to

     * @return  mixed   MDB2_OK on success, a MDB2 error on failure

     *

     * @access  public

     */

    function rollback($savepoint = null)

    {

        $this->debug('Rolling back transaction/savepoint', __FUNCTION__, array('is_manip' => true, 'savepoint' => $savepoint));

        if (!$this->in_transaction) {

            return $this->raiseError(MDB2_ERROR_INVALID, null, null,

                'rollback cannot be done changes are auto committed', __FUNCTION__);

        }

        if (!is_null($savepoint)) {

            $query = 'ROLLBACK TO SAVEPOINT '.$savepoint;

            return $this->_doQuery($query, true);

        }



        if ($this->uncommitedqueries) {

            $connection = $this->getConnection();

            if (PEAR::isError($connection)) {

                return $connection;

            }

            if (!@OCIRollback($connection)) {

                return $this->raiseError(null, null, null,

                'Unable to rollback transaction', __FUNCTION__);

            }

            $this->uncommitedqueries = 0;

        }

        $this->in_transaction = false;

        return MDB2_OK;

    }



    // }}}

    // {{{ function setTransactionIsolation()



    /**

     * Set the transacton isolation level.

     *

     * @param   string  standard isolation level

     *                  READ UNCOMMITTED (allows dirty reads)

     *                  READ COMMITTED (prevents dirty reads)

     *                  REPEATABLE READ (prevents nonrepeatable reads)

     *                  SERIALIZABLE (prevents phantom reads)

     * @return  mixed   MDB2_OK on success, a MDB2 error on failure

     *

     * @access  public

     * @since   2.1.1

     */

    function setTransactionIsolation($isolation)

    {

        $this->debug('Setting transaction isolation level', __FUNCTION__, array('is_manip' => true));

        switch ($isolation) {

        case 'READ UNCOMMITTED':

            $isolation = 'READ COMMITTED';

        case 'READ COMMITTED':

        case 'REPEATABLE READ':

            $isolation = 'SERIALIZABLE';

        case 'SERIALIZABLE':

            break;

        default:

            return $this->raiseError(MDB2_ERROR_UNSUPPORTED, null, null,

                'isolation level is not supported: '.$isolation, __FUNCTION__);

        }



        $query = "ALTER SESSION ISOLATION LEVEL $isolation";

        return $this->_doQuery($query, true);

    }



    // }}}

    // {{{ _doConnect()



    /**

     * do the grunt work of the connect

     *

     * @return connection on success or MDB2 Error Object on failure

     * @access protected

     */

    function _doConnect($username, $password, $persistent = false)

    {

        if (!PEAR::loadExtension($this->phptype)) {

            return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,

                'extension '.$this->phptype.' is not compiled into PHP', __FUNCTION__);

        }



        $sid = '';



        if (!empty($this->dsn['service']) && $this->dsn['hostspec']) {

            //oci8://username:password@foo.example.com[:port]/?service=service

            // service name is given, it is assumed that hostspec is really a

            // hostname, we try to construct an oracle connection string from this

            $port = $this->dsn['port'] ? $this->dsn['port'] : 1521;

            $sid = sprintf("(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)

                            (HOST=%s) (PORT=%s)))

                            (CONNECT_DATA=(SERVICE_NAME=%s)))",

                $this->dsn['hostspec'],

                $port,

                $this->dsn['service']

            );

        } elseif ($this->dsn['hostspec']) {

            // we are given something like 'oci8://username:password@foo/'

            // we have hostspec but not a service name, now we assume that

            // hostspec is a tnsname defined in tnsnames.ora

            $sid = $this->dsn['hostspec'];

            if (isset($this->dsn['port']) && $this->dsn['port']) {

                $sid = $sid.':'.$this->dsn['port'];

            }

        } else {

            // oci://username:password@

            // if everything fails, we have to rely on environment variables

            // not before a check to 'emulate_database'

            if (!$this->options['emulate_database'] && $this->database_name) {

                $sid = $this->database_name;

            } elseif (getenv('ORACLE_SID')) {

                $sid = getenv('ORACLE_SID');

            } elseif ($sid = getenv('TWO_TASK')) {

                $sid = getenv('TWO_TASK');

            } else {

                return $this->raiseError(MDB2_ERROR_NOT_FOUND, null, null,

                    'not a valid connection string or environment variable [ORACLE_SID|TWO_TASK] not set',

                    __FUNCTION__);

            }

        }



        if (function_exists('oci_connect')) {

            if ($this->_isNewLinkSet()) {

                $connect_function = 'oci_new_connect';

            } else {

                $connect_function = $persistent ? 'oci_pconnect' : 'oci_connect';

            }



            $charset = empty($this->dsn['charset']) ? null : $this->dsn['charset'];

            $session_mode = empty($this->dsn['session_mode']) ? null : $this->dsn['session_mode'];

            $connection = @$connect_function($username, $password, $sid, $charset, $session_mode);

            $error = @OCIError();

            if (isset($error['code']) && $error['code'] == 12541) {

                // Couldn't find TNS listener.  Try direct connection.

                $connection = @$connect_function($username, $password, null, $charset);

            }

        } else {

            $connect_function = $persistent ? 'OCIPLogon' : 'OCILogon';

            $connection = @$connect_function($username, $password, $sid);



            if (!empty($this->dsn['charset'])) {

                $result = $this->setCharset($this->dsn['charset'], $connection);

                if (PEAR::isError($result)) {

                    return $result;

                }

            }

        }



        if (!$connection) {

            return $this->raiseError(MDB2_ERROR_CONNECT_FAILED, null, null,

                'unable to establish a connection', __FUNCTION__);

        }



       if (empty($this->dsn['disable_iso_date'])) {

            $query = "ALTER SESSION SET NLS_DATE_FORMAT='YYYY-MM-DD HH24:MI:SS'";

            $err =& $this->_doQuery($query, true, $connection);

            if (PEAR::isError($err)) {

                $this->disconnect(false);

                return $err;

            }

       }



        $query = "ALTER SESSION SET NLS_NUMERIC_CHARACTERS='. '";

        $err =& $this->_doQuery($query, true, $connection);

        if (PEAR::isError($err)) {

            $this->disconnect(false);

            return $err;

        }



        return $connection;

    }



    // }}}

    // {{{ connect()



    /**

     * Connect to the database

     *

     * @return MDB2_OK on success, MDB2 Error Object on failure

     * @access public

     */

    function connect()

    {

        if (is_resource($this->connection)) {

            //if (count(array_diff($this->connected_dsn, $this->dsn)) == 0

            if (MDB2::areEquals($this->connected_dsn, $this->dsn)

                && $this->opened_persistent == $this->options['persistent']

            ) {

                return MDB2_OK;

            }

            $this->disconnect(false);

        }



        if ($this->database_name && $this->options['emulate_database']) {

             $this->dsn['username'] = $this->options['database_name_prefix'].$this->database_name;

        }



        $connection = $this->_doConnect($this->dsn['username'],

                                        $this->dsn['password'],

                                        $this->options['persistent']);

        if (PEAR::isError($connection)) {

            return $connection;

        }

        $this->connection = $connection;

        $this->connected_dsn = $this->dsn;

        $this->connected_database_name = '';

        $this->opened_persistent = $this->options['persistent'];

        $this->dbsyntax = $this->dsn['dbsyntax'] ? $this->dsn['dbsyntax'] : $this->phptype;



        if ($this->database_name) {

            if ($this->database_name != $this->connected_database_name) {

                $query = 'ALTER SESSION SET CURRENT_SCHEMA = "' .strtoupper($this->database_name) .'"';

                $result =& $this->_doQuery($query);

                if (PEAR::isError($result)) {

                    $err = $this->raiseError($result, null, null,

                        'Could not select the database: '.$this->database_name, __FUNCTION__);

                    return $err;

                }

                $this->connected_database_name = $this->database_name;

            }

        }



        $this->as_keyword = ' ';

        $server_info = $this->getServerVersion();

        if (is_array($server_info)) {

            if ($server_info['major'] >= '10') {

                $this->as_keyword = ' AS ';

            }

        }

        return MDB2_OK;

    }



    // }}}

    // {{{ databaseExists()



    /**

     * check if given database name is exists?

     *

     * @param string $name    name of the database that should be checked

     *

     * @return mixed true/false on success, a MDB2 error on failure

     * @access public

     */

    function databaseExists($name)

    {

        $connection = $this->_doConnect($this->dsn['username'],

                                        $this->dsn['password'],

                                        $this->options['persistent']);

        if (PEAR::isError($connection)) {

            return $connection;

        }



        $query = 'ALTER SESSION SET CURRENT_SCHEMA = "' .strtoupper($name) .'"';

        $result =& $this->_doQuery($query, true, $connection, false);

        if (PEAR::isError($result)) {

            if (!MDB2::isError($result, MDB2_ERROR_NOT_FOUND)) {

                return $result;

            }

            return false;

        }

        return true;

    }



    // }}}

    // {{{ disconnect()



    /**

     * Log out and disconnect from the database.

     *

     * @param  boolean $force if the disconnect should be forced even if the

     *                        connection is opened persistently

     * @return mixed true on success, false if not connected and error

     *                object on error

     * @access public

     */

    function disconnect($force = true)

    {

        if (is_resource($this->connection)) {

            if ($this->in_transaction) {

                $dsn = $this->dsn;

                $database_name = $this->database_name;

                $persistent = $this->options['persistent'];

                $this->dsn = $this->connected_dsn;

                $this->database_name = $this->connected_database_name;

                $this->options['persistent'] = $this->opened_persistent;

                $this->rollback();

                $this->dsn = $dsn;

                $this->database_name = $database_name;

                $this->options['persistent'] = $persistent;

            }



            if (!$this->opened_persistent || $force) {

                $ok = false;

                if (function_exists('oci_close')) {

                    $ok = @oci_close($this->connection);

                } else {

                    $ok = @OCILogOff($this->connection);

                }

                if (!$ok) {

                    return $this->raiseError(MDB2_ERROR_DISCONNECT_FAILED,

                           null, null, null, __FUNCTION__);

                }

            }

            $this->uncommitedqueries = 0;

        } else {

            return false;

        }

        return parent::disconnect($force);

    }



    // }}}

    // {{{ standaloneQuery()



    /**

     * execute a query as DBA

     *

     * @param string $query     the SQL query

     * @param mixed  $types     array containing the types of the columns in

     *                          the result set

     * @param boolean $is_manip if the query is a manipulation query

     * @return mixed MDB2_OK on success, a MDB2 error on failure

     * @access public

     */

    function &standaloneQuery($query, $types = null, $is_manip = false)

    {

        $user = $this->options['DBA_username']? $this->options['DBA_username'] : $this->dsn['username'];

        $pass = $this->options['DBA_password']? $this->options['DBA_password'] : $this->dsn['password'];

        $connection = $this->_doConnect($user, $pass, $this->options['persistent']);

        if (PEAR::isError($connection)) {

            return $connection;

        }



        $offset = $this->offset;

        $limit = $this->limit;

        $this->offset = $this->limit = 0;

        $query = $this->_modifyQuery($query, $is_manip, $limit, $offset);



        $result =& $this->_doQuery($query, $is_manip, $connection, false);

        if (!PEAR::isError($result)) {

            if ($is_manip) {

                $result = $this->_affectedRows($connection, $result);

            } else {

                $result =& $this->_wrapResult($result, $types, true, false, $limit, $offset);

            }

        }



        @OCILogOff($connection);

        return $result;

    }



    // }}}

    // {{{ _modifyQuery()



    /**

     * Changes a query string for various DBMS specific reasons

     *

     * @param string $query  query to modify

     * @param boolean $is_manip  if it is a DML query

     * @param integer $limit  limit the number of rows

     * @param integer $offset  start reading from given offset

     * @return string modified query

     * @access protected

     */

    function _modifyQuery($query, $is_manip, $limit, $offset)

    {

        if (preg_match('/^\s*SELECT/i', $query)) {

            if (!preg_match('/\sFROM\s/i', $query)) {

                $query.= " FROM dual";

            }

            if ($limit > 0) {

                // taken from http://svn.ez.no/svn/ezcomponents/packages/Database

                $max = $offset + $limit;

                if ($offset > 0) {

                    $min = $offset + 1;

                    $query = "SELECT * FROM (SELECT a.*, ROWNUM mdb2rn FROM ($query) a WHERE ROWNUM <= $max) WHERE mdb2rn >= $min";

                } else {

                    $query = "SELECT a.* FROM ($query) a WHERE ROWNUM <= $max";

                }

            }

        }

        return $query;

    }



    // }}}

    // {{{ _doQuery()



    /**

     * Execute a query

     * @param string $query  query

     * @param boolean $is_manip  if the query is a manipulation query

     * @param resource $connection

     * @param string $database_name

     * @return result or error object

     * @access protected

     */

    function &_doQuery($query, $is_manip = false, $connection = null, $database_name = null)

    {

        $this->last_query = $query;

        $result = $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'pre'));

        if ($result) {

            if (PEAR::isError($result)) {

                return $result;

            }

            $query = $result;

        }

        if ($this->getOption('disable_query')) {

            if ($is_manip) {

                return 0;

            }

            return null;

        }



        if (is_null($connection)) {

            $connection = $this->getConnection();

            if (PEAR::isError($connection)) {

                return $connection;

            }

        }



        $query = str_replace("\r\n", "\n", $query); //for fixing end-of-line character in the PL/SQL in windows

        $result = @OCIParse($connection, $query);

        if (!$result) {

            $err = $this->raiseError(null, null, null,

                'Could not create statement', __FUNCTION__);

            return $err;

        }



        $mode = $this->in_transaction ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;

        if (!@OCIExecute($result, $mode)) {

            $err =& $this->raiseError($result, null, null,

                'Could not execute statement', __FUNCTION__);

            return $err;

        }



        if (is_numeric($this->options['result_prefetching'])) {

            @ocisetprefetch($result, $this->options['result_prefetching']);

        }



        $this->debug($query, 'query', array('is_manip' => $is_manip, 'when' => 'post', 'result' => $result));

        return $result;

    }



    // }}}

    // {{{ _affectedRows()



    /**

     * Returns the number of rows affected

     *

     * @param resource $result

     * @param resource $connection

     * @return mixed MDB2 Error Object or the number of rows affected

     * @access private

     */

    function _affectedRows($connection, $result = null)

    {

        if (is_null($connection)) {

            $connection = $this->getConnection();

            if (PEAR::isError($connection)) {

                return $connection;

            }

        }

        return @OCIRowCount($result);

    }



    // }}}

    // {{{ getServerVersion()



    /**

     * return version information about the server

     *

     * @param bool   $native  determines if the raw version string should be returned

     * @return mixed array/string with version information or MDB2 error object

     * @access public

     */

    function getServerVersion($native = false)

    {

        $connection = $this->getConnection();

        if (PEAR::isError($connection)) {

            return $connection;

        }

        if ($this->connected_server_info) {

            $server_info = $this->connected_server_info;

        } else {

            $server_info = @ociserverversion($connection);

        }

        if (!$server_info) {

            return $this->raiseError(null, null, null,

                'Could not get server information', __FUNCTION__);

        }

        // cache server_info

        $this->connected_server_info = $server_info;

        if (!$native) {

            if (!preg_match('/ (\d+)\.(\d+)\.(\d+)\.([\d\.]+) /', $server_info, $tmp)) {

                return $this->raiseError(MDB2_ERROR_INVALID, null, null,

                    'Could not parse version information:'.$server_info, __FUNCTION__);

            }

            $server_info = array(

                'major' => $tmp[1],

                'minor' => $tmp[2],

                'patch' => $tmp[3],

                'extra' => $tmp[4],

                'native' => $server_info,

            );

        }

        return $server_info;

    }



    // }}}

    // {{{ prepare()



    /**

     * Prepares a query for multiple execution with execute().

     * With some database backends, this is emulated.

     * prepare() requires a generic query as string like

     * 'INSERT INTO numbers VALUES(?,?)' or

     * 'INSERT INTO numbers VALUES(:foo,:bar)'.

     * The ? and :name and are placeholders which can be set using

     * bindParam() and the query can be sent off using the execute() method.

     * The allowed format for :name can be set with the 'bindname_format' option.

     *

     * @param string $query the query to prepare

     * @param mixed   $types  array that contains the types of the placeholders

     * @param mixed   $result_types  array that contains the types of the columns in

     *                        the result set or MDB2_PREPARE_RESULT, if set to

     *                        MDB2_PREPARE_MANIP the query is handled as a manipulation query

     * @param mixed   $lobs   key (field) value (parameter) pair for all lob placeholders

     * @return mixed resource handle for the prepared query on success, a MDB2

     *        error on failure

     * @access public

     * @see bindParam, execute

     */

    function &prepare($query, $types = null, $result_types = null, $lobs = array())

    {

        if ($this->options['emulate_prepared']) {

            $obj =& parent::prepare($query, $types, $result_types, $lobs);

            return $obj;

        }

        $is_manip = ($result_types === MDB2_PREPARE_MANIP);

        $offset = $this->offset;

        $limit = $this->limit;

        $this->offset = $this->limit = 0;

        $result = $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'pre'));

        if ($result) {

            if (PEAR::isError($result)) {

                return $result;

            }

            $query = $result;

        }

        $query = $this->_modifyQuery($query, $is_manip, $limit, $offset);

        $placeholder_type_guess = $placeholder_type = null;

        $question = '?';

        $colon = ':';

        $positions = array();

        $position = 0;

        $parameter = -1;

        while ($position < strlen($query)) {

            $q_position = strpos($query, $question, $position);

            $c_position = strpos($query, $colon, $position);

            if ($q_position && $c_position) {

                $p_position = min($q_position, $c_position);

            } elseif ($q_position) {

                $p_position = $q_position;

            } elseif ($c_position) {

                $p_position = $c_position;

            } else {

                break;

            }

            if (is_null($placeholder_type)) {

                $placeholder_type_guess = $query[$p_position];

            }

            

            $new_pos = $this->_skipDelimitedStrings($query, $position, $p_position);

            if (PEAR::isError($new_pos)) {

                return $new_pos;

            }

            if ($new_pos != $position) {

                $position = $new_pos;

                continue; //evaluate again starting from the new position

            }



            if ($query[$position] == $placeholder_type_guess) {

                if (is_null($placeholder_type)) {

                    $placeholder_type = $query[$p_position];

                    $question = $colon = $placeholder_type;

                    if (!empty($types) && is_array($types)) {

                        if ($placeholder_type == ':') {

                            if (is_int(key($types))) {

                                $types_tmp = $types;

                                $types = array();

                                $count = -1;

                            }

                        } else {

                            $types = array_values($types);

                        }

                    }

                }

                if ($placeholder_type == ':') {

                    $regexp = '/^.{'.($position+1).'}('.$this->options['bindname_format'].').*$/s';

                    $parameter = preg_replace($regexp, '\\1', $query);

                    if ($parameter === '') {

                        $err =& $this->raiseError(MDB2_ERROR_SYNTAX, null, null,

                            'named parameter name must match "bindname_format" option', __FUNCTION__);

                        return $err;

                    }

                    // use parameter name in type array

                    if (isset($count) && isset($types_tmp[++$count])) {

                        $types[$parameter] = $types_tmp[$count];

                    }

                    $length = strlen($parameter) + 1;

                } else {

                    ++$parameter;

                    //$length = strlen($parameter);

                    $length = 1; // strlen('?')

                }

                if (!in_array($parameter, $positions)) {

                    $positions[] = $parameter;

                }

                if (isset($types[$parameter])

                    && ($types[$parameter] == 'clob' || $types[$parameter] == 'blob')

                ) {

                    if (!isset($lobs[$parameter])) {

                        $lobs[$parameter] = $parameter;

                    }

                    $value = $this->quote(true, $types[$parameter]);

                    if (PEAR::isError($value)) {

                        return $value;

                    }

                    $query = substr_replace($query, $value, $p_position, $length);

                    $position = $p_position + strlen($value) - 1;

                } elseif ($placeholder_type == '?') {

                    $query = substr_replace($query, ':'.$parameter, $p_position, 1);

                    $position = $p_position + $length;

                } else {

                    $position = $p_position + 1;

                }

            } else {

                $position = $p_position;

            }

        }

        if (is_array($lobs)) {

            $columns = $variables = '';

            foreach ($lobs as $parameter => $field) {

                $columns.= ($columns ? ', ' : ' RETURNING ').$field;

                $variables.= ($variables ? ', ' : ' INTO ').':'.$parameter;

            }

            $query.= $columns.$variables;

        }

        $connection = $this->getConnection();

        if (PEAR::isError($connection)) {

            return $connection;

        }

        $statement = @OCIParse($connection, $query);

        if (!$statement) {

            $err =& $this->raiseError(null, null, null,

                'Could not create statement', __FUNCTION__);

            return $err;

        }



        $class_name = 'MDB2_Statement_'.$this->phptype;

        $obj = new $class_name($this, $statement, $positions, $query, $types, $result_types, $is_manip, $limit, $offset);

        $this->debug($query, __FUNCTION__, array('is_manip' => $is_manip, 'when' => 'post', 'result' => $obj));

        return $obj;

    }



    // }}}

    // {{{ nextID()



    /**

     * Returns the next free id of a sequence

     *

     * @param string $seq_name name of the sequence

     * @param boolean $ondemand when true the sequence is

     *                           automatic created, if it

     *                           not exists

     * @return mixed MDB2 Error Object or id

     * @access public

     */

    function nextID($seq_name, $ondemand = true)

    {

        $sequence_name = $this->quoteIdentifier($this->getSequenceName($seq_name), true);

        $query = "SELECT $sequence_name.nextval FROM DUAL";

        $this->pushErrorHandling(PEAR_ERROR_RETURN);

        $this->expectError(MDB2_ERROR_NOSUCHTABLE);

        $result = $this->queryOne($query, 'integer');

        $this->popExpect();

        $this->popErrorHandling();

        if (PEAR::isError($result)) {

            if ($ondemand && $result->getCode() == MDB2_ERROR_NOSUCHTABLE) {

                $this->loadModule('Manager', null, true);

                $result = $this->manager->createSequence($seq_name);

                if (PEAR::isError($result)) {

                    return $result;

                }

                return $this->nextId($seq_name, false);

            }

        }

        return $result;

    }



    // }}}

    // {{{ lastInsertID()



    /**

     * Returns the autoincrement ID if supported or $id or fetches the current

     * ID in a sequence called: $table.(empty($field) ? '' : '_'.$field)

     *

     * @param string $table name of the table into which a new row was inserted

     * @param string $field name of the field into which a new row was inserted

     * @return mixed MDB2 Error Object or id

     * @access public

     */

    function lastInsertID($table = null, $field = null)

    {

        $seq = $table.(empty($field) ? '' : '_'.$field);

        $sequence_name = $this->quoteIdentifier($this->getSequenceName($seq), true);

        return $this->queryOne("SELECT $sequence_name.currval", 'integer');

    }



    // }}}

    // {{{ currId()



    /**

     * Returns the current id of a sequence

     *

     * @param string $seq_name name of the sequence

     * @return mixed MDB2_Error or id

     * @access public

     */

    function currId($seq_name)

    {

        $sequence_name = $this->getSequenceName($seq_name);

        $query = 'SELECT (last_number-1) FROM all_sequences';

        $query.= ' WHERE sequence_name='.$this->quote($sequence_name, 'text');

        $query.= ' OR sequence_name='.$this->quote(strtoupper($sequence_name), 'text');

        return $this->queryOne($query, 'integer');

    }

}



/**

 * MDB2 OCI8 result driver

 *

 * @package MDB2

 * @category Database

 * @author Lukas Smith <smith@pooteeweet.org>

 */

class MDB2_Result_oci8 extends MDB2_Result_Common

{

    // }}}

    // {{{ fetchRow()



    /**

     * Fetch a row and insert the data into an existing array.

     *

     * @param int       $fetchmode  how the array data should be indexed

     * @param int    $rownum    number of the row where the data can be found

     * @return int data array on success, a MDB2 error on failure

     * @access public

     */

    function &fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)

    {

        if (!is_null($rownum)) {

            $seek = $this->seek($rownum);

            if (PEAR::isError($seek)) {

                return $seek;

            }

        }

        if ($fetchmode == MDB2_FETCHMODE_DEFAULT) {

            $fetchmode = $this->db->fetchmode;

        }

        if ($fetchmode & MDB2_FETCHMODE_ASSOC) {

            @OCIFetchInto($this->result, $row, OCI_ASSOC+OCI_RETURN_NULLS);

            if (is_array($row)

                && $this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE

            ) {

                $row = array_change_key_case($row, $this->db->options['field_case']);

            }

        } else {

            @OCIFetchInto($this->result, $row, OCI_RETURN_NULLS);

        }

        if (!$row) {

            if ($this->result === false) {

                $err =& $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,

                    'resultset has already been freed', __FUNCTION__);

                return $err;

            }

            $null = null;

            return $null;

        }

        // remove additional column at the end

        if ($this->offset > 0) {

            array_pop($row);

        }

        $mode = 0;

        $rtrim = false;

        if ($this->db->options['portability'] & MDB2_PORTABILITY_RTRIM) {

            if (empty($this->types)) {

                $mode += MDB2_PORTABILITY_RTRIM;

            } else {

                $rtrim = true;

            }

        }

        if ($mode) {

            $this->db->_fixResultArrayValues($row, $mode);

        }

        if (!($fetchmode & MDB2_FETCHMODE_ASSOC) && !empty($this->types)) {

            $row = $this->db->datatype->convertResultRow($this->types, $row, $rtrim);

        } elseif (($fetchmode & MDB2_FETCHMODE_ASSOC) && !empty($this->types_assoc)) {

            $row = $this->db->datatype->convertResultRow($this->types_assoc, $row, $rtrim);

        }

        if (!empty($this->values)) {

            $this->_assignBindColumns($row);

        }

        if ($fetchmode === MDB2_FETCHMODE_OBJECT) {

            $object_class = $this->db->options['fetch_class'];

            if ($object_class == 'stdClass') {

                $row = (object) $row;

            } else {

                $row = &new $object_class($row);

            }

        }

        ++$this->rownum;

        return $row;

    }



    // }}}

    // {{{ _getColumnNames()



    /**

     * Retrieve the names of columns returned by the DBMS in a query result.

     *

     * @return  mixed   Array variable that holds the names of columns as keys

     *                  or an MDB2 error on failure.

     *                  Some DBMS may not return any columns when the result set

     *                  does not contain any rows.

     * @access private

     */

    function _getColumnNames()

    {

        $columns = array();

        $numcols = $this->numCols();

        if (PEAR::isError($numcols)) {

            return $numcols;

        }

        for ($column = 0; $column < $numcols; $column++) {

            $column_name = @OCIColumnName($this->result, $column + 1);

            $columns[$column_name] = $column;

        }

        if ($this->db->options['portability'] & MDB2_PORTABILITY_FIX_CASE) {

            $columns = array_change_key_case($columns, $this->db->options['field_case']);

        }

        return $columns;

    }



    // }}}

    // {{{ numCols()



    /**

     * Count the number of columns returned by the DBMS in a query result.

     *

     * @return mixed integer value with the number of columns, a MDB2 error

     *      on failure

     * @access public

     */

    function numCols()

    {

        $cols = @OCINumCols($this->result);

        if (is_null($cols)) {

            if ($this->result === false) {

                return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,

                    'resultset has already been freed', __FUNCTION__);

            } elseif (is_null($this->result)) {

                return count($this->types);

            }

            return $this->db->raiseError(null, null, null,

                'Could not get column count', __FUNCTION__);

        }

        if ($this->offset > 0) {

            --$cols;

        }

        return $cols;

    }



    // }}}

    // {{{ free()



    /**

     * Free the internal resources associated with $result.

     *

     * @return boolean true on success, false if $result is invalid

     * @access public

     */

    function free()

    {

        if (is_resource($this->result) && $this->db->connection) {

            $free = @OCIFreeCursor($this->result);

            if ($free === false) {

                return $this->db->raiseError(null, null, null,

                    'Could not free result', __FUNCTION__);

            }

        }

        $this->result = false;

        return MDB2_OK;



    }

}



/**

 * MDB2 OCI8 buffered result driver

 *

 * @package MDB2

 * @category Database

 * @author Lukas Smith <smith@pooteeweet.org>

 */

class MDB2_BufferedResult_oci8 extends MDB2_Result_oci8

{

    var $buffer;

    var $buffer_rownum = - 1;



    // {{{ _fillBuffer()



    /**

     * Fill the row buffer

     *

     * @param int $rownum   row number upto which the buffer should be filled

                            if the row number is null all rows are ready into the buffer

     * @return boolean true on success, false on failure

     * @access protected

     */

    function _fillBuffer($rownum = null)

    {

        if (isset($this->buffer) && is_array($this->buffer)) {

            if (is_null($rownum)) {

                if (!end($this->buffer)) {

                    return false;

                }

            } elseif (isset($this->buffer[$rownum])) {

                return (bool)$this->buffer[$rownum];

            }

        }



        $row = true;

        while ((is_null($rownum) || $this->buffer_rownum < $rownum)

            && ($row = @OCIFetchInto($this->result, $buffer, OCI_RETURN_NULLS))

        ) {

            ++$this->buffer_rownum;

            // remove additional column at the end

            if ($this->offset > 0) {

                array_pop($buffer);

            }

            if (empty($this->types)) {

                foreach (array_keys($buffer) as $key) {

                    if (is_a($buffer[$key], 'oci-lob')) {

                        $buffer[$key] = $buffer[$key]->load();

                    }

                }

            }

            $this->buffer[$this->buffer_rownum] = $buffer;

        }



        if (!$row) {

            ++$this->buffer_rownum;

            $this->buffer[$this->buffer_rownum] = false;

            return false;

        }

        return true;

    }



    // }}}

    // {{{ fetchRow()



    /**

     * Fetch a row and insert the data into an existing array.

     *

     * @param int       $fetchmode  how the array data should be indexed

     * @param int    $rownum    number of the row where the data can be found

     * @return int data array on success, a MDB2 error on failure

     * @access public

     */

    function &fetchRow($fetchmode = MDB2_FETCHMODE_DEFAULT, $rownum = null)

    {

        if ($this->result === false) {

            $err =& $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,

                'resultset has already been freed', __FUNCTION__);

            return $err;

        } elseif (is_null($this->result)) {

            return null;

        }

        if (!is_null($rownum)) {

            $seek = $this->seek($rownum);

            if (PEAR::isError($seek)) {

                return $seek;

            }

        }

        $target_rownum = $this->rownum + 1;

        if ($fetchmode == MDB2_FETCHMODE_DEFAULT) {

            $fetchmode = $this->db->fetchmode;

        }

        if (!$this->_fillBuffer($target_rownum)) {

            $null = null;

            return $null;

        }

        $row = $this->buffer[$target_rownum];

        if ($fetchmode & MDB2_FETCHMODE_ASSOC) {

            $column_names = $this->getColumnNames();

            foreach ($column_names as $name => $i) {

                $column_names[$name] = $row[$i];

            }

            $row = $column_names;

        }

        $mode = 0;

        $rtrim = false;

        if ($this->db->options['portability'] & MDB2_PORTABILITY_RTRIM) {

            if (empty($this->types)) {

                $mode += MDB2_PORTABILITY_RTRIM;

            } else {

                $rtrim = true;

            }

        }

        if ($mode) {

            $this->db->_fixResultArrayValues($row, $mode);

        }

        if (!empty($this->types)) {

            $row = $this->db->datatype->convertResultRow($this->types, $row, $rtrim);

        }

        if (!empty($this->values)) {

            $this->_assignBindColumns($row);

        }

        if ($fetchmode === MDB2_FETCHMODE_OBJECT) {

            $object_class = $this->db->options['fetch_class'];

            if ($object_class == 'stdClass') {

                $row = (object) $row;

            } else {

                $row = &new $object_class($row);

            }

        }

        ++$this->rownum;

        return $row;

    }



    // }}}

    // {{{ seek()



    /**

     * Seek to a specific row in a result set

     *

     * @param int    $rownum    number of the row where the data can be found

     * @return mixed MDB2_OK on success, a MDB2 error on failure

     * @access public

     */

    function seek($rownum = 0)

    {

        if ($this->result === false) {

            return $this->db->raiseError(MDB2_ERROR_NEED_MORE_DATA, null, null,

                'resultset has already been freed', __FUNCTION__);

        }

        $this->rownum = $rownum - 1;

        return MDB2_OK;

    }



    // }}}

    // {{{ valid()



    /**

     * Check if the…