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<?php

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

/**

 * The PEAR DB driver for PHP's msql extension

 * for interacting with Mini SQL databases

 *

 * PHP's mSQL extension did weird things with NULL values prior to PHP

 * 4.3.11 and 5.0.4.  Make sure your version of PHP meets or exceeds

 * those versions.

 *

 * 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     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: msql.php,v 1.1 2005-03-30 08:50:33 jpm 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 msql extension

 * for interacting with Mini SQL databases

 *

 * These methods overload the ones declared in DB_common.

 *

 * PHP's mSQL extension did weird things with NULL values prior to PHP

 * 4.3.11 and 5.0.4.  Make sure your version of PHP meets or exceeds

 * those versions.

 *

 * @category   Database

 * @package    DB

 * @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: 1.7.5

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

 * @since      Class not functional until Release 1.7.0

 */

class DB_msql extends DB_common

{

    // {{{ properties

    /**

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

     * @var string

     */

    var $phptype = 'msql';

    /**

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

     * @var string

     */

    var $dbsyntax = 'msql';

    /**

     * 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'  => false,

    );

    /**

     * 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();

    /**

     * The query result resource created by PHP

     *

     * Used to make affectedRows() work.  Only contains the result for

     * data manipulation queries.  Contains false for other queries.

     *

     * @var resource

     * @access private

     */

    var $_result;

    // }}}

    // {{{ constructor

    /**

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

     *

     * @return void

     */

    function DB_msql()

    {

        $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.

     *

     * Example of how to connect:

     * <code>

     * require_once 'DB.php';

     *

     * // $dsn = 'msql://hostname/dbname';  // use a TCP connection

     * $dsn = 'msql:///dbname';             // use a socket

     * $options = array(

     *     'portability' => DB_PORTABILITY_ALL,

     * );

     *

     * $db =& DB::connect($dsn, $options);

     * if (PEAR::isError($db)) {

     *     die($db->getMessage());

     * }

     * </code>

     *

     * @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('msql')) {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

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

        }

        $params = array();

        if ($dsn['hostspec']) {

            $params[] = $dsn['port']

                        ? $dsn['hostspec'] . ',' . $dsn['port']

                        : $dsn['hostspec'];

        }

        $connect_function = $persistent ? 'msql_pconnect' : 'msql_connect';

        $ini = ini_get('track_errors');

        $php_errormsg = '';

        if ($ini) {

            $this->connection = @call_user_func_array($connect_function,

                                                      $params);

        } else {

            ini_set('track_errors', 1);

            $this->connection = @call_user_func_array($connect_function,

                                                      $params);

            ini_set('track_errors', $ini);

        }

        if (!$this->connection) {

            if (($err = @msql_error()) != '') {

                return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                         null, null, null,

                                         $err);

            } else {

                return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                         null, null, null,

                                         $php_errormsg);

            }

        }

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

            return $this->msqlRaiseError();

        }

        return DB_OK;

    }

    // }}}

    // {{{ disconnect()

    /**

     * Disconnects from the database server

     *

     * @return bool  TRUE on success, FALSE on failure

     */

    function disconnect()

    {

        $ret = @msql_close($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)

    {

        $this->last_query = $query;

        $query = $this->modifyQuery($query);

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

        if (!$result) {

            return $this->msqlRaiseError();

        }

        // Determine which queries that should return data, and which

        // should return an error code only.

        if (DB::isManip($query)) {

            $this->_result = $result;

            return DB_OK;

        } else {

            $this->_result = false;

            return $result;

        }

    }

    // }}}

    // {{{ nextResult()

    /**

     * Move the internal msql 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;

    }

    // }}}

    // {{{ 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.

     *

     * PHP's mSQL extension did weird things with NULL values prior to PHP

     * 4.3.11 and 5.0.4.  Make sure your version of PHP meets or exceeds

     * those versions.

     *

     * @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 (!@msql_data_seek($result, $rownum)) {

                return null;

            }

        }

        if ($fetchmode & DB_FETCHMODE_ASSOC) {

            $arr = @msql_fetch_array($result, MSQL_ASSOC);

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

                $arr = array_change_key_case($arr, CASE_LOWER);

            }

        } else {

            $arr = @msql_fetch_row($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 @msql_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)

    {

        $cols = @msql_num_fields($result);

        if (!$cols) {

            return $this->msqlRaiseError();

        }

        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)

    {

        $rows = @msql_num_rows($result);

        if ($rows === false) {

            return $this->msqlRaiseError();

        }

        return $rows;

    }

    // }}}

    // {{{ affected()

    /**

     * 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->_result) {

            return 0;

        }

        return msql_affected_rows($this->_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_msql::createSequence(), DB_msql::dropSequence()

     */

    function nextId($seq_name, $ondemand = true)

    {

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

        $repeat = false;

        do {

            $this->pushErrorHandling(PEAR_ERROR_RETURN);

            $result =& $this->query("SELECT _seq FROM ${seqname}");

            $this->popErrorHandling();

            if ($ondemand && DB::isError($result) &&

                $result->getCode() == DB_ERROR_NOSUCHTABLE) {

                $repeat = true;

                $this->pushErrorHandling(PEAR_ERROR_RETURN);

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

                $this->popErrorHandling();

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

                    return $this->raiseError($result);

                }

            } else {

                $repeat = false;

            }

        } while ($repeat);

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

            return $this->raiseError($result);

        }

        $arr = $result->fetchRow(DB_FETCHMODE_ORDERED);

        $result->free();

        return $arr[0];

    }

    // }}}

    // {{{ createSequence()

    /**

     * Creates a new sequence

     *

     * Also creates a new table to associate the sequence with.  Uses

     * a separate table to ensure portability with other drivers.

     *

     * @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_msql::nextID(), DB_msql::dropSequence()

     */

    function createSequence($seq_name)

    {

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

        $res = $this->query('CREATE TABLE ' . $seqname

                            . ' (id INTEGER NOT NULL)');

        if (DB::isError($res)) {

            return $res;

        }

        $res = $this->query("CREATE SEQUENCE ON ${seqname}");

        return $res;

    }

    // }}}

    // {{{ 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_msql::nextID(), DB_msql::createSequence()

     */

    function dropSequence($seq_name)

    {

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

    }

    // }}}

    // {{{ quoteIdentifier()

    /**

     * mSQL does not support delimited identifiers

     *

     * @param string $str  the identifier name to be quoted

     *

     * @return object  a DB_Error object

     *

     * @see DB_common::quoteIdentifier()

     * @since Method available since Release 1.7.0

     */

    function quoteIdentifier($str)

    {

        return $this->raiseError(DB_ERROR_UNSUPPORTED);

    }

    // }}}

    // {{{ escapeSimple()

    /**

     * Escapes a string according to the current DBMS's standards

     *

     * @param string $str  the string to be escaped

     *

     * @return string  the escaped string

     *

     * @see DB_common::quoteSmart()

     * @since Method available since Release 1.7.0

     */

    function escapeSimple($str)

    {

        return addslashes($str);

    }

    // }}}

    // {{{ msqlRaiseError()

    /**

     * 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_msql::errorNative(), DB_msql::errorCode()

     */

    function msqlRaiseError($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 @msql_error();

    }

    // }}}

    // {{{ errorCode()

    /**

     * Determines PEAR::DB error code from the database's text error message

     *

     * @param string $errormsg  the error message returned from the database

     *

     * @return integer  the error number from a DB_ERROR* constant

     */

    function errorCode($errormsg)

    {

        static $error_regexps;

        if (!isset($error_regexps)) {

            $error_regexps = array(

                '/^Access to database denied/i'

                    => DB_ERROR_ACCESS_VIOLATION,

                '/^Bad index name/i'

                    => DB_ERROR_ALREADY_EXISTS,

                '/^Bad order field/i'

                    => DB_ERROR_SYNTAX,

                '/^Bad type for comparison/i'

                    => DB_ERROR_SYNTAX,

                '/^Can\'t perform LIKE on/i'

                    => DB_ERROR_SYNTAX,

                '/^Can\'t use TEXT fields in LIKE comparison/i'

                    => DB_ERROR_SYNTAX,

                '/^Couldn\'t create temporary table/i'

                    => DB_ERROR_CANNOT_CREATE,

                '/^Error creating table file/i'

                    => DB_ERROR_CANNOT_CREATE,

                '/^Field .* cannot be null$/i'

                    => DB_ERROR_CONSTRAINT_NOT_NULL,

                '/^Index (field|condition) .* cannot be null$/i'

                    => DB_ERROR_SYNTAX,

                '/^Invalid date format/i'

                    => DB_ERROR_INVALID_DATE,

                '/^Invalid time format/i'

                    => DB_ERROR_INVALID,

                '/^Literal value for .* is wrong type$/i'

                    => DB_ERROR_INVALID_NUMBER,

                '/^No Database Selected/i'

                    => DB_ERROR_NODBSELECTED,

                '/^No value specified for field/i'

                    => DB_ERROR_VALUE_COUNT_ON_ROW,

                '/^Non unique value for unique index/i'

                    => DB_ERROR_CONSTRAINT,

                '/^Out of memory for temporary table/i'

                    => DB_ERROR_CANNOT_CREATE,

                '/^Permission denied/i'

                    => DB_ERROR_ACCESS_VIOLATION,

                '/^Reference to un-selected table/i'

                    => DB_ERROR_SYNTAX,

                '/^syntax error/i'

                    => DB_ERROR_SYNTAX,

                '/^Table .* exists$/i'

                    => DB_ERROR_ALREADY_EXISTS,

                '/^Unknown database/i'

                    => DB_ERROR_NOSUCHDB,

                '/^Unknown field/i'

                    => DB_ERROR_NOSUCHFIELD,

                '/^Unknown (index|system variable)/i'

                    => DB_ERROR_NOT_FOUND,

                '/^Unknown table/i'

                    => DB_ERROR_NOSUCHTABLE,

                '/^Unqualified field/i'

                    => DB_ERROR_SYNTAX,

            );

        }

        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

     *

     * @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::setOption()

     */

    function tableInfo($result, $mode = null)

    {

        if (is_string($result)) {

            /*

             * Probably received a table name.

             * Create a result resource identifier.

             */

            $id = @msql_query("SELECT * FROM $result",

                              $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->raiseError(DB_ERROR_NEED_MORE_DATA);

        }

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

            $case_func = 'strtolower';

        } else {

            $case_func = 'strval';

        }

        $count = @msql_num_fields($id);

        $res   = array();

        if ($mode) {

            $res['num_fields'] = $count;

        }

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

            $tmp = @msql_fetch_field($id);

            $flags = '';

            if ($tmp->not_null) {

                $flags .= 'not_null ';

            }

            if ($tmp->unique) {

                $flags .= 'unique_key ';

            }

            $flags = trim($flags);

            $res[$i] = array(

                'table' => $case_func($tmp->table),

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

                'type'  => $tmp->type,

                'len'   => msql_field_len($id, $i),

                'flags' => $flags,

            );

            if ($mode & DB_TABLEINFO_ORDER) {

                $res['order'][$res[$i]['name']] = $i;

            }

            if ($mode & DB_TABLEINFO_ORDERTABLE) {

                $res['ordertable'][$res[$i]['table']][$res[$i]['name']] = $i;

            }

        }

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

        if ($got_string) {

            @msql_free_result($id);

        }

        return $res;

    }

    // }}}

    // {{{ getSpecialQuery()

    /**

     * Obtain a list of a given type of objects

     *

     * @param string $type  the kind of objects you want to retrieve

     *

     * @return array  the array containing the list of objects requested

     *

     * @access protected

     * @see DB_common::getListOf()

     */

    function getSpecialQuery($type)

    {

        switch ($type) {

            case 'databases':

                $id = @msql_list_dbs($this->connection);

                break;

            case 'tables':

                $id = @msql_list_tables($this->dsn['database'],

                                        $this->connection);

                break;

            default:

                return null;

        }

        if (!$id) {

            return $this->msqlRaiseError();

        }

        $out = array();

        while ($row = @msql_fetch_row($id)) {

            $out[] = $row[0];

        }

        return $out;

    }

    // }}}

}

/*

 * Local variables:

 * tab-width: 4

 * c-basic-offset: 4

 * End:

 */

?>