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<?php

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

/**

 * The PEAR DB driver for PHP's fbsql extension

 * for interacting with FrontBase 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     Frank M. Kromann <frank@frontbase.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 fbsql extension

 * for interacting with FrontBase databases

 *

 * These methods overload the ones declared in DB_common.

 *

 * @category   Database

 * @package    DB

 * @author     Frank M. Kromann <frank@frontbase.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

 * @since      Class functional since Release 1.7.0

 */

class DB_fbsql extends DB_common

{

    // {{{ properties

    /**

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

     * @var string

     */

    var $phptype = 'fbsql';

    /**

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

     * @var string

     */

    var $dbsyntax = 'fbsql';

    /**

     * 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'         => 'alter',

        'new_link'      => false,

        'numrows'       => true,

        'pconnect'      => true,

        'prepare'       => false,

        'ssl'           => false,

        'transactions'  => true,

    );

    /**

     * A mapping of native error codes to DB error codes

     * @var array

     */

    var $errorcode_map = array(

         22 => DB_ERROR_SYNTAX,

         85 => DB_ERROR_ALREADY_EXISTS,

        108 => DB_ERROR_SYNTAX,

        116 => DB_ERROR_NOSUCHTABLE,

        124 => DB_ERROR_VALUE_COUNT_ON_ROW,

        215 => DB_ERROR_NOSUCHFIELD,

        217 => DB_ERROR_INVALID_NUMBER,

        226 => DB_ERROR_NOSUCHFIELD,

        231 => DB_ERROR_INVALID,

        239 => DB_ERROR_TRUNCATED,

        251 => DB_ERROR_SYNTAX,

        266 => DB_ERROR_NOT_FOUND,

        357 => DB_ERROR_CONSTRAINT_NOT_NULL,

        358 => DB_ERROR_CONSTRAINT,

        360 => DB_ERROR_CONSTRAINT,

        361 => DB_ERROR_CONSTRAINT,

    );

    /**

     * The raw database connection created by PHP

     * @var resource

     */

    var $connection;

    /**

     * The DSN information for connecting to a database

     * @var array

     */

    var $dsn = array();

    // }}}

    // {{{ 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('fbsql')) {

            return $this->raiseError(DB_ERROR_EXTENSION_NOT_FOUND);

        }

        $this->dsn = $dsn;

        if ($dsn['dbsyntax']) {

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

        }

        $params = array(

            $dsn['hostspec'] ? $dsn['hostspec'] : 'localhost',

            $dsn['username'] ? $dsn['username'] : null,

            $dsn['password'] ? $dsn['password'] : null,

        );

        $connect_function = $persistent ? 'fbsql_pconnect' : 'fbsql_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) {

            return $this->raiseError(DB_ERROR_CONNECT_FAILED,

                                     null, null, null,

                                     $php_errormsg);

        }

        if ($dsn['database']) {

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

                return $this->fbsqlRaiseError();

            }

        }

        return DB_OK;

    }

    // }}}

    // {{{ disconnect()

    /**

     * Disconnects from the database server

     *

     * @return bool  TRUE on success, FALSE on failure

     */

    function disconnect()

    {

        $ret = @fbsql_close($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);

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

        if (!$result) {

            return $this->fbsqlRaiseError();

        }

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

        // should return an error code only.

        if ($this->_checkManip($query)) {

            return DB_OK;

        }

        return $result;

    }

    // }}}

    // {{{ nextResult()

    /**

     * Move the internal fbsql 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 @fbsql_next_result($result);

    }

    // }}}

    // {{{ fetchInto()

    /**

     * Places a row from the result set into the given array

     *

     * Formating of the array and the data therein are configurable.

     * See DB_result::fetchInto() for more information.

     *

     * This method is not meant to be called directly.  Use

     * DB_result::fetchInto() instead.  It can't be declared "protected"

     * because DB_result is a separate object.

     *

     * @param resource $result    the query result resource

     * @param array    $arr       the referenced array to put the data in

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

     * @param int      $rownum    the row number to fetch (0 = first row)

     *

     * @return mixed  DB_OK on success, NULL when the end of a result set is

     *                 reached or on failure

     *

     * @see DB_result::fetchInto()

     */

    function fetchInto($result, &$arr, $fetchmode, $rownum = null)

    {

        if ($rownum !== null) {

            if (!@fbsql_data_seek($result, $rownum)) {

                return null;

            }

        }

        if ($fetchmode & DB_FETCHMODE_ASSOC) {

            $arr = @fbsql_fetch_array($result, FBSQL_ASSOC);

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

                $arr = array_change_key_case($arr, CASE_LOWER);

            }

        } else {

            $arr = @fbsql_fetch_row($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 is_resource($result) ? fbsql_free_result($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=false)

    {

        if ($onoff) {

            $this->query("SET COMMIT TRUE");

        } else {

            $this->query("SET COMMIT FALSE");

        }

    }

    // }}}

    // {{{ commit()

    /**

     * Commits the current transaction

     *

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

     */

    function commit()

    {

        @fbsql_commit($this->connection);

    }

    // }}}

    // {{{ rollback()

    /**

     * Reverts the current transaction

     *

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

     */

    function rollback()

    {

        @fbsql_rollback($this->connection);

    }

    // }}}

    // {{{ 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)

    {

        $cols = @fbsql_num_fields($result);

        if (!$cols) {

            return $this->fbsqlRaiseError();

        }

        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)

    {

        $rows = @fbsql_num_rows($result);

        if ($rows === null) {

            return $this->fbsqlRaiseError();

        }

        return $rows;

    }

    // }}}

    // {{{ affectedRows()

    /**

     * Determines the number of rows affected by a data maniuplation query

     *

     * 0 is returned for queries that don't manipulate data.

     *

     * @return int  the number of rows.  A DB_Error object on failure.

     */

    function affectedRows()

    {

        if ($this->_last_query_manip) {

            $result = @fbsql_affected_rows($this->connection);

        } else {

            $result = 0;

        }

        return $result;

     }

    // }}}

    // {{{ nextId()

    /**

     * Returns the next free id in a sequence

     *

     * @param string  $seq_name  name of the sequence

     * @param boolean $ondemand  when true, the seqence is automatically

     *                            created if it does not exist

     *

     * @return int  the next id number in the sequence.

     *               A DB_Error object on failure.

     *

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

     *      DB_fbsql::createSequence(), DB_fbsql::dropSequence()

     */

    function nextId($seq_name, $ondemand = true)

    {

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

        do {

            $repeat = 0;

            $this->pushErrorHandling(PEAR_ERROR_RETURN);

            $result = $this->query('SELECT UNIQUE FROM ' . $seqname);

            $this->popErrorHandling();

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

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

                $repeat = 1;

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

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

                    return $result;

                }

            } else {

                $repeat = 0;

            }

        } while ($repeat);

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

            return $this->fbsqlRaiseError();

        }

        $result->fetchInto($tmp, DB_FETCHMODE_ORDERED);

        return $tmp[0];

    }

    /**

     * Creates a new sequence

     *

     * @param string $seq_name  name of the new sequence

     *

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

     *

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

     *      DB_fbsql::nextID(), DB_fbsql::dropSequence()

     */

    function createSequence($seq_name)

    {

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

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

                            . ' (id INTEGER NOT NULL,'

                            . ' PRIMARY KEY(id))');

        if ($res) {

            $res = $this->query('SET UNIQUE = 0 FOR ' . $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_fbsql::nextID(), DB_fbsql::createSequence()

     */

    function dropSequence($seq_name)

    {

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

                            . ' RESTRICT');

    }

    // }}}

    // {{{ modifyLimitQuery()

    /**

     * Adds LIMIT clauses to a query string according to current DBMS standards

     *

     * @param string $query   the query to modify

     * @param int    $from    the row to start to fetching (0 = the first row)

     * @param int    $count   the numbers of rows to fetch

     * @param mixed  $params  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 placeholder for non-array

     *                         parameters or 1 placeholder per array element.

     *

     * @return string  the query string with LIMIT clauses added

     *

     * @access protected

     */

    function modifyLimitQuery($query, $from, $count, $params = array())

    {

        if (DB::isManip($query) || $this->_next_query_manip) {

            return preg_replace('/^([\s(])*SELECT/i',

                                "\\1SELECT TOP($count)", $query);

        } else {

            return preg_replace('/([\s(])*SELECT/i',

                                "\\1SELECT TOP($from, $count)", $query);

        }

    }

    // }}}

    // {{{ quoteBoolean()

    /**

     * Formats a boolean value for use within a query in a locale-independent

     * manner.

     *

     * @param boolean the boolean value to be quoted.

     * @return string the quoted string.

     * @see DB_common::quoteSmart()

     * @since Method available since release 1.7.8.

     */

    function quoteBoolean($boolean) {

        return $boolean ? 'TRUE' : 'FALSE';

    }

    // }}}

    // {{{ quoteFloat()

    /**

     * Formats a float value for use within a query in a locale-independent

     * manner.

     *

     * @param float the float value to be quoted.

     * @return string the quoted string.

     * @see DB_common::quoteSmart()

     * @since Method available since release 1.7.8.

     */

    function quoteFloat($float) {

        return $this->escapeSimple(str_replace(',', '.', strval(floatval($float))));

    }

    // }}}

    // {{{ fbsqlRaiseError()

    /**

     * 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_fbsql::errorNative(), DB_common::errorCode()

     */

    function fbsqlRaiseError($errno = null)

    {

        if ($errno === null) {

            $errno = $this->errorCode(fbsql_errno($this->connection));

        }

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

                                 @fbsql_error($this->connection));

    }

    // }}}

    // {{{ errorNative()

    /**

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

     *

     * @return int  the DBMS' error code

     */

    function errorNative()

    {

        return @fbsql_errno($this->connection);

    }

    // }}}

    // {{{ 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::tableInfo()

     */

    function tableInfo($result, $mode = null)

    {

        if (is_string($result)) {

            /*

             * Probably received a table name.

             * Create a result resource identifier.

             */

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

                                     $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->fbsqlRaiseError(DB_ERROR_NEED_MORE_DATA);

        }

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

            $case_func = 'strtolower';

        } else {

            $case_func = 'strval';

        }

        $count = @fbsql_num_fields($id);

        $res   = array();

        if ($mode) {

            $res['num_fields'] = $count;

        }

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

            $res[$i] = array(

                'table' => $case_func(@fbsql_field_table($id, $i)),

                'name'  => $case_func(@fbsql_field_name($id, $i)),

                'type'  => @fbsql_field_type($id, $i),

                'len'   => @fbsql_field_len($id, $i),

                'flags' => @fbsql_field_flags($id, $i),

            );

            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) {

            @fbsql_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 "table_name" FROM information_schema.tables'

                       . ' t0, information_schema.schemata t1'

                       . ' WHERE t0.schema_pk=t1.schema_pk AND'

                       . ' "table_type" = \'BASE TABLE\''

                       . ' AND "schema_name" = current_schema';

            case 'views':

                return 'SELECT "table_name" FROM information_schema.tables'

                       . ' t0, information_schema.schemata t1'

                       . ' WHERE t0.schema_pk=t1.schema_pk AND'

                       . ' "table_type" = \'VIEW\''

                       . ' AND "schema_name" = current_schema';

            case 'users':

                return 'SELECT "user_name" from information_schema.users';

            case 'functions':

                return 'SELECT "routine_name" FROM'

                       . ' information_schema.psm_routines'

                       . ' t0, information_schema.schemata t1'

                       . ' WHERE t0.schema_pk=t1.schema_pk'

                       . ' AND "routine_kind"=\'FUNCTION\''

                       . ' AND "schema_name" = current_schema';

            case 'procedures':

                return 'SELECT "routine_name" FROM'

                       . ' information_schema.psm_routines'

                       . ' t0, information_schema.schemata t1'

                       . ' WHERE t0.schema_pk=t1.schema_pk'

                       . ' AND "routine_kind"=\'PROCEDURE\''

                       . ' AND "schema_name" = current_schema';

            default:

                return null;

        }

    }

    // }}}

}

/*

 * Local variables:

 * tab-width: 4

 * c-basic-offset: 4

 * End:

 */

?>