oci8.php

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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.                                 |
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// +----------------------------------------------------------------------+
// | Author: James L. Pine <[e-mail]>                              |
// | Maintainer: Daniel Convissor <[e-mail]>                       |
// +----------------------------------------------------------------------+
//
// $Id: oci8.php,v 1.2 2005/07/22 05:10:14 max Exp $


// be aware...  OCIError() only appears to return anything when given a
// statement, so functions return the generic DB_ERROR instead of more
// useful errors that have to do with feedback from the database.


require_once PEAR_DIR . 'DB/common.php';

/**
 * Database independent query interface definition for PHP's Oracle 8
 * call-interface extension.
 *
 * Definitely works with versions 8 and 9 of Oracle.
 *
 * @package  DB
 * @version  $Id: oci8.php,v 1.2 2005/07/22 05:10:14 max Exp $
 * @category Database
 * @author   James L. Pine <[e-mail]>
 */
class DB_oci8 extends DB_common
{
    // {{{ properties

    var $connection;
    var $phptype, $dbsyntax;
    var $manip_query = array();
    var $prepare_types = array();
    var $autoCommit = 1;
    var $last_stmt = false;

    /**
     * stores the $data passed to execute() in the oci8 driver
     *
     * Gets reset to array() when simpleQuery() is run.
     *
     * Needed in case user wants to call numRows() after prepare/execute
     * was used.
     *
     * @var array
     * @access private
     */
    var $_data = array();

    // }}}
    // {{{ constructor

    function DB_oci8()
    {
        $this->DB_common();
        $this->phptype = 'oci8';
        $this->dbsyntax = 'oci8';
        $this->features = array(
            'prepare' => false,
            'pconnect' => true,
            'transactions' => true,
            'limit' => 'alter'
        );
        $this->errorcode_map = array(
            1 => DB_ERROR_CONSTRAINT,
            900 => DB_ERROR_SYNTAX,
            904 => DB_ERROR_NOSUCHFIELD,
            921 => DB_ERROR_SYNTAX,
            923 => DB_ERROR_SYNTAX,
            942 => DB_ERROR_NOSUCHTABLE,
            955 => DB_ERROR_ALREADY_EXISTS,
            1400 => DB_ERROR_CONSTRAINT_NOT_NULL,
            1407 => DB_ERROR_CONSTRAINT_NOT_NULL,
            1476 => DB_ERROR_DIVZERO,
            1722 => DB_ERROR_INVALID_NUMBER,
            2289 => DB_ERROR_NOSUCHTABLE,
            2291 => DB_ERROR_CONSTRAINT,
            2449 => DB_ERROR_CONSTRAINT,
        );
    }

    // }}}
    // {{{ connect()

    /**
     * Connect to a database and log in as the specified user.
     *
     * @param $dsn the data source name (see DB::parseDSN for syntax)
     * @param $persistent (optional) whether the connection should
     *        be persistent
     *
     * @return int DB_OK on success, a DB error code on failure
     */
    function connect($dsninfo, $persistent = false)
    {
        if (!DB::assertExtension('oci8')) {
            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);
        }
        $this->dsn = $dsninfo;

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

        if ($dsninfo['hostspec']) {
            $conn = @$connect_function($dsninfo['username'],
                                       $dsninfo['password'],
                                       $dsninfo['hostspec']);
        } elseif ($dsninfo['username'] || $dsninfo['password']) {
            $conn = @$connect_function($dsninfo['username'],
                                       $dsninfo['password']);
        } else {
            $conn = false;
        }
        if ($conn == false) {
            $error = OCIError();
            $error = (is_array($error)) ? $error['message'] : null;
            return $this->raiseError(DB_ERROR_CONNECT_FAILED, null, null,
                                     null, $error);
        }
        $this->connection = $conn;
        return DB_OK;
    }

    // }}}
    // {{{ disconnect()

    /**
     * Log out and disconnect from the database.
     *
     * @return bool true on success, false if not connected.
     */
    function disconnect()
    {
        $ret = @OCILogOff($this->connection);
        $this->connection = null;
        return $ret;
    }

    // }}}
    // {{{ simpleQuery()

    /**
     * Send a query to oracle and return the results as an oci8 resource
     * identifier.
     *
     * @param $query the SQL query
     *
     * @return int returns a valid oci8 result for successful SELECT
     * queries, DB_OK for other successful queries.  A DB error code
     * is returned on failure.
     */
    function simpleQuery($query)
    {
        $this->_data = array();
        $this->last_query = $query;
        $query = $this->modifyQuery($query);
        $result = @OCIParse($this->connection, $query);
        if (!$result) {
            return $this->oci8RaiseError();
        }
        if ($this->autoCommit) {
            $success = @OCIExecute($result,OCI_COMMIT_ON_SUCCESS);
        } else {
            $success = @OCIExecute($result,OCI_DEFAULT);
        }
        if (!$success) {
            return $this->oci8RaiseError($result);
        }
        $this->last_stmt=$result;
        // Determine which queries that should return data, and which
        // should return an error code only.
        return DB::isManip($query) ? DB_OK : $result;
    }

    // }}}
    // {{{ nextResult()

    /**
     * Move the internal oracle result pointer to the next available result
     *
     * @param a valid oci8 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) {
            return $this->raiseError(DB_ERROR_NOT_CAPABLE);
        }
        if ($fetchmode & DB_FETCHMODE_ASSOC) {
            $moredata = @OCIFetchInto($result,$arr,OCI_ASSOC+OCI_RETURN_NULLS+OCI_RETURN_LOBS);
            if ($this->options['portability'] & DB_PORTABILITY_LOWERCASE &&
                $moredata)
            {
                $arr = array_change_key_case($arr, CASE_LOWER);
            }
        } else {
            $moredata = OCIFetchInto($result,$arr,OCI_RETURN_NULLS+OCI_RETURN_LOBS);
        }
        if (!$moredata) {
            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 oci8 result identifier
     *
     * @return bool true on success, false if $result is invalid
     */
    function freeResult($result)
    {
        return @OCIFreeStatement($result);
    }

    /**
     * Free the internal resources associated with a prepared query.
     *
     * @param $stmt oci8 statement identifier
     *
     * @return bool true on success, false if $result is invalid
     */
    function freePrepared($stmt)
    {
        if (isset($this->prepare_types[(int)$stmt])) {
            unset($this->prepare_types[(int)$stmt]);
            unset($this->manip_query[(int)$stmt]);
        } else {
            return false;
        }
        return true;
    }

    // }}}
    // {{{ numRows()

    function numRows($result)
    {
        // emulate numRows for Oracle.  yuck.
        if ($this->options['portability'] & DB_PORTABILITY_NUMROWS &&
            $result === $this->last_stmt)
        {
            $countquery = 'SELECT COUNT(*) FROM ('.$this->last_query.')';
            $save_query = $this->last_query;
            $save_stmt = $this->last_stmt;

            if (count($this->_data)) {
                $smt = $this->prepare('SELECT COUNT(*) FROM ('.$this->last_query.')');
                $count = $this->execute($smt, $this->_data);
            } else {
                $count =& $this->query($countquery);
            }

            if (DB::isError($count) ||
                DB::isError($row = $count->fetchRow(DB_FETCHMODE_ORDERED)))
            {
                $this->last_query = $save_query;
                $this->last_stmt = $save_stmt;
                return $this->raiseError(DB_ERROR_NOT_CAPABLE);
            }
            return $row[0];
        }
        return $this->raiseError(DB_ERROR_NOT_CAPABLE);
    }

    // }}}
    // {{{ numCols()

    /**
     * Get the number of columns in a result set.
     *
     * @param $result oci8 result identifier
     *
     * @return int the number of columns per row in $result
     */
    function numCols($result)
    {
        $cols = @OCINumCols($result);
        if (!$cols) {
            return $this->oci8RaiseError($result);
        }
        return $cols;
    }

    // }}}
    // {{{ errorNative()

    /**
     * Get the native error code of the last error (if any) that occured
     * on the current connection.  This does not work, as OCIError does
     * not work unless given a statement.  If OCIError does return
     * something, so will this.
     *
     * @return int native oci8 error code
     */
    function errorNative()
    {
        if (is_resource($this->last_stmt)) {
            $error = @OCIError($this->last_stmt);
        } else {
            $error = @OCIError($this->connection);
        }
        if (is_array($error)) {
            return $error['code'];
        }
        return false;
    }

    // }}}
    // {{{ prepare()

    /**
     * Prepares a query for multiple execution with execute().
     *
     * With oci8, this is emulated.
     *
     * prepare() requires a generic query as string like <code>
     *    INSERT INTO numbers VALUES (?, ?, ?)
     * </code>.  The <kbd>?</kbd> characters are placeholders.
     *
     * Three types of placeholders can be used:
     *   + <kbd>?</kbd>  a quoted scalar value, i.e. strings, integers
     *   + <kbd>!</kbd>  value is inserted 'as is'
     *   + <kbd>&</kbd>  requires a file name.  The file's contents get
     *                     inserted into the query (i.e. saving binary
     *                     data in a db)
     *
     * Use backslashes to escape placeholder characters if you don't want
     * them to be interpreted as placeholders.  Example: <code>
     *    "UPDATE foo SET col=? WHERE col='over \& under'"
     * </code>
     *
     * @param string $query query to be prepared
     * @return mixed DB statement resource on success. DB_Error on failure.
     */
    function prepare($query)
    {
        $tokens   = preg_split('/((?<!\\\)[&?!])/', $query, -1,
                               PREG_SPLIT_DELIM_CAPTURE);
        $binds    = count($tokens) - 1;
        $token    = 0;
        $types    = array();
        $newquery = '';

        foreach ($tokens as $key => $val) {
            switch ($val) {
                case '?':
                    $types[$token++] = DB_PARAM_SCALAR;
                    unset($tokens[$key]);
                    break;
                case '&':
                    $types[$token++] = DB_PARAM_OPAQUE;
                    unset($tokens[$key]);
                    break;
                case '!':
                    $types[$token++] = DB_PARAM_MISC;
                    unset($tokens[$key]);
                    break;
                default:
                    $tokens[$key] = preg_replace('/\\\([&?!])/', "\\1", $val);
                    if ($key != $binds) {
                        $newquery .= $tokens[$key] . ':bind' . $token;
                    } else {
                        $newquery .= $tokens[$key];
                    }
            }
        }

        $this->last_query = $query;
        $newquery = $this->modifyQuery($newquery);
        if (!$stmt = @OCIParse($this->connection, $newquery)) {
            return $this->oci8RaiseError();
        }
        $this->prepare_types[$stmt] = $types;
        $this->manip_query[(int)$stmt] = DB::isManip($query);
        return $stmt;
    }

    // }}}
    // {{{ execute()

    /**
     * Executes a DB statement prepared with prepare().
     *
     * @param resource  $stmt  a DB statement resource returned from prepare()
     * @param mixed  $data  array, string or numeric data to be used in
     *                      execution of the statement.  Quantity of items
     *                      passed must match quantity of placeholders in
     *                      query:  meaning 1 for non-array items or the
     *                      quantity of elements in the array.
     * @return int returns an oci8 result resource for successful
     * SELECT queries, DB_OK for other successful queries.  A DB error
     * code is returned on failure.
     * @see DB_oci::prepare()
     */
    function &execute($stmt, $data = array())
    {