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<?php

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

/**

 * The PEAR DB driver for PHP's ifx extension

 * for interacting with Informix databases

 *

 * PHP version 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     Tomas V.V.Cox <cox@idecnet.com>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    CVS: $Id$

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

 */

/**

 * Obtain the DB_common class so it can be extended from

 */

require_once 'DB/common.php';

/**

 * The methods PEAR DB uses to interact with PHP's ifx extension

 * for interacting with Informix databases

 *

 * These methods overload the ones declared in DB_common.

 *

 * More info on Informix errors can be found at:

 * http://www.informix.com/answers/english/ierrors.htm

 *

 * TODO:

 *   - set needed env Informix vars on connect

 *   - implement native prepare/execute

 *

 * @category   Database

 * @package    DB

 * @author     Tomas V.V.Cox <cox@idecnet.com>

 * @author     Daniel Convissor <danielc@php.net>

 * @copyright  1997-2007 The PHP Group

 * @license    http://www.php.net/license/3_0.txt  PHP License 3.0

 * @version    Release: 1.9.2

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

 */

class DB_ifx extends DB_common

{

    // {{{ properties

    /**

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

     * @var string

     */

    var $phptype = 'ifx';

    /**

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

     * @var string

     */

    var $dbsyntax = 'ifx';

    /**

     * 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'       => 'emulate',

        'pconnect'      => true,

        'prepare'       => false,

        'ssl'           => false,

        'transactions'  => true,

    );

    /**

     * A mapping of native error codes to DB error codes

     * @var array

     */

    var $errorcode_map = array(

        '-201'    => DB_ERROR_SYNTAX,

        '-206'    => DB_ERROR_NOSUCHTABLE,

        '-217'    => DB_ERROR_NOSUCHFIELD,

        '-236'    => DB_ERROR_VALUE_COUNT_ON_ROW,

        '-239'    => DB_ERROR_CONSTRAINT,

        '-253'    => DB_ERROR_SYNTAX,

        '-268'    => DB_ERROR_CONSTRAINT,

        '-292'    => DB_ERROR_CONSTRAINT_NOT_NULL,

        '-310'    => DB_ERROR_ALREADY_EXISTS,

        '-316'    => DB_ERROR_ALREADY_EXISTS,

        '-319'    => DB_ERROR_NOT_FOUND,

        '-329'    => DB_ERROR_NODBSELECTED,

        '-346'    => DB_ERROR_CONSTRAINT,

        '-386'    => DB_ERROR_CONSTRAINT_NOT_NULL,

        '-391'    => DB_ERROR_CONSTRAINT_NOT_NULL,

        '-554'    => DB_ERROR_SYNTAX,

        '-691'    => DB_ERROR_CONSTRAINT,

        '-692'    => DB_ERROR_CONSTRAINT,

        '-703'    => DB_ERROR_CONSTRAINT_NOT_NULL,

        '-1202'   => DB_ERROR_DIVZERO,

        '-1204'   => DB_ERROR_INVALID_DATE,

        '-1205'   => DB_ERROR_INVALID_DATE,

        '-1206'   => DB_ERROR_INVALID_DATE,

        '-1209'   => DB_ERROR_INVALID_DATE,

        '-1210'   => DB_ERROR_INVALID_DATE,

        '-1212'   => DB_ERROR_INVALID_DATE,

        '-1213'   => DB_ERROR_INVALID_NUMBER,

    );

    /**

     * 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 number of rows affected by a data manipulation query

     * @var integer

     * @access private

     */

    var $affected = 0;

    // }}}

    // {{{ constructor

    /**

     * This constructor calls <kbd>parent::__construct()</kbd>

     *

     * @return void

     */

    function __construct()

    {

        parent::__construct();

    }

    // }}}

    // {{{ connect()

    /**

     * Connect to the database server, log in and open the database

     *

     * Don't call this method directly.  Use DB::connect() instead.

     *

     * @param array $dsn         the data source name

     * @param bool  $persistent  should the connection be persistent?

     *

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

     */

    function connect($dsn, $persistent = false)

    {

        if (!PEAR::loadExtension('informix') &&

            !PEAR::loadExtension('Informix'))

        {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

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

        }

        $dbhost = $dsn['hostspec'] ? '@' . $dsn['hostspec'] : '';

        $dbname = $dsn['database'] ? $dsn['database'] . $dbhost : '';

        $user = $dsn['username'] ? $dsn['username'] : '';

        $pw = $dsn['password'] ? $dsn['password'] : '';

        $connect_function = $persistent ? 'ifx_pconnect' : 'ifx_connect';

        $this->connection = @$connect_function($dbname, $user, $pw);

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

            return $this->ifxRaiseError(DB_ERROR_CONNECT_FAILED);

        }

        return DB_OK;

    }

    // }}}

    // {{{ disconnect()

    /**

     * Disconnects from the database server

     *

     * @return bool  TRUE on success, FALSE on failure

     */

    function disconnect()

    {

        $ret = @ifx_close($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 = $this->_checkManip($query);

        $this->last_query = $query;

        $this->affected   = null;

        if (preg_match('/(SELECT|EXECUTE)/i', $query)) {    //TESTME: Use !DB::isManip()?

            // the scroll is needed for fetching absolute row numbers

            // in a select query result

            $result = @ifx_query($query, $this->connection, IFX_SCROLL);

        } else {

            if (!$this->autocommit && $ismanip) {

                if ($this->transaction_opcount == 0) {

                    $result = @ifx_query('BEGIN WORK', $this->connection);

                    if (!$result) {

                        return $this->ifxRaiseError();

                    }

                }

                $this->transaction_opcount++;

            }

            $result = @ifx_query($query, $this->connection);

        }

        if (!$result) {

            return $this->ifxRaiseError();

        }

        $this->affected = @ifx_affected_rows($result);

        // Determine which queries should return data, and which

        // should return an error code only.

        if (preg_match('/(SELECT|EXECUTE)/i', $query)) {

            return $result;

        }

        // XXX Testme: free results inside a transaction

        // may cause to stop it and commit the work?

        // Result has to be freed even with a insert or update

        @ifx_free_result($result);

        return DB_OK;

    }

    // }}}

    // {{{ nextResult()

    /**

     * Move the internal ifx result pointer to the next available result

     *

     * @param a valid fbsql result resource

     *

     * @access public

     *

     * @return true if a result is available otherwise return false

     */

    function nextResult($result)

    {

        return false;

    }

    // }}}

    // {{{ 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 ($this->_last_query_manip) {

            return $this->affected;

        } else {

            return 0;

        }

    }

    // }}}

    // {{{ 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 (($rownum !== null) && ($rownum < 0)) {

            return null;

        }

        if ($rownum === null) {

            /*

             * Even though fetch_row() should return the next row  if

             * $rownum is null, it doesn't in all cases.  Bug 598.

             */

            $rownum = 'NEXT';

        } else {

            // Index starts at row 1, unlike most DBMS's starting at 0.

            $rownum++;

        }

        if (!$arr = @ifx_fetch_row($result, $rownum)) {

            return null;

        }

        if ($fetchmode !== DB_FETCHMODE_ASSOC) {

            $i=0;

            $order = array();

            foreach ($arr as $val) {

                $order[$i++] = $val;

            }

            $arr = $order;

        } elseif ($fetchmode == DB_FETCHMODE_ASSOC &&

                  $this->options['portability'] & DB_PORTABILITY_LOWERCASE)

        {

            $arr = array_change_key_case($arr, CASE_LOWER);

        }

        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;

    }

    // }}}

    // {{{ 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)

    {

        if (!$cols = @ifx_num_fields($result)) {

            return $this->ifxRaiseError();

        }

        return $cols;

    }

    // }}}

    // {{{ 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 is_resource($result) ? ifx_free_result($result) : false;

    }

    // }}}

    // {{{ 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 = true)

    {

        // 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) {

            $result = @ifx_query('COMMIT WORK', $this->connection);

            $this->transaction_opcount = 0;

            if (!$result) {

                return $this->ifxRaiseError();

            }

        }

        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) {

            $result = @ifx_query('ROLLBACK WORK', $this->connection);

            $this->transaction_opcount = 0;

            if (!$result) {

                return $this->ifxRaiseError();

            }

        }

        return DB_OK;

    }

    // }}}

    // {{{ ifxRaiseError()

    /**

     * 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_ifx::errorNative(), DB_ifx::errorCode()

     */

    function ifxRaiseError($errno = null)

    {

        if ($errno === null) {

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

        }

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

                                 $this->errorNative());

    }

    // }}}

    // {{{ errorNative()

    /**

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

     *

     * @return string  the DBMS' error code and message

     */

    function errorNative()

    {

        return @ifx_error() . ' ' . @ifx_errormsg();

    }

    // }}}

    // {{{ errorCode()

    /**

     * Maps native error codes to DB's portable ones.

     *

     * Requires that the DB implementation's constructor fills

     * in the <var>$errorcode_map</var> property.

     *

     * @param  string  $nativecode  error code returned by the database

     * @return int a portable DB error code, or DB_ERROR if this DB

     * implementation has no mapping for the given error code.

     */

    function errorCode($nativecode)

    {

        if (preg_match('/SQLCODE=(.*)]/', $nativecode, $match)) {

            $code = $match[1];

            if (isset($this->errorcode_map[$code])) {

                return $this->errorcode_map[$code];

            }

        }

        return DB_ERROR;

    }

    // }}}

    // {{{ tableInfo()

    /**

     * Returns information about a table or a result set

     *

     * NOTE: only supports 'table' if <var>$result</var> is a table name.

     *

     * If analyzing a query result and the result has duplicate field names,

     * an error will be raised saying

     * <samp>can't distinguish duplicate field names</samp>.

     *

     * @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.

             */

            $id = @ifx_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.

             */

            $id = $result;

            $got_string = false;

        }

        if (!is_resource($id)) {

            return $this->ifxRaiseError(DB_ERROR_NEED_MORE_DATA);

        }

        $flds = @ifx_fieldproperties($id);

        $count = @ifx_num_fields($id);

        if (count($flds) != $count) {

            return $this->raiseError("can't distinguish duplicate field names");

        }

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

            $case_func = 'strtolower';

        } else {

            $case_func = 'strval';

        }

        $i   = 0;

        $res = array();

        if ($mode) {

            $res['num_fields'] = $count;

        }

        foreach ($flds as $key => $value) {

            $props = explode(';', $value);

            $res[$i] = array(

                'table' => $got_string ? $case_func($result) : '',

                'name'  => $case_func($key),

                'type'  => $props[0],

                'len'   => $props[1],

                'flags' => $props[4] == 'N' ? 'not_null' : '',

            );

            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;

            }

            $i++;

        }

        // free the result only if we were called on a table

        if ($got_string) {

            @ifx_free_result($id);

        }

        return $res;

    }

    // }}}

    // {{{ 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 tabname FROM systables WHERE tabid >= 100';

            default:

                return null;

        }

    }

    // }}}

}

/*

 * Local variables:

 * tab-width: 4

 * c-basic-offset: 4

 * End:

 */

?>