<?php

/*

Copyright (C) 2004-2006 Samuel J. Greear. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. 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.

THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.

$Id$

*/


class Database extends PDO {

    const FETCH_ASSOC = PDO::FETCH_ASSOC;
    const FETCH_BOTH = PDO::FETCH_BOTH;
    const FETCH_BOUND = PDO::FETCH_BOUND;
    const FETCH_CLASS = PDO::FETCH_CLASS;
    const FETCH_INFO = PDO::FETCH_INTO;
    const FETCH_LAZY = PDO::FETCH_LAZY;
    const FETCH_NUM = PDO::FETCH_NUM;
    const FETCH_OBJ = PDO::FETCH_OBJ;

    public $App;

    private $Handle;

    public function __construct($app, $dsn, $username=NULL, $password=NULL) {
        $this->App = $app;
        $this->Handle = NULL;

        $dsn .= ';user=' . $username;
        parent::__construct($dsn, $username, $password);
    }

    public function Begin() {
        parent::beginTransaction();
    }

    public function Commit() {
        parent::commit();
    }

    public function Rollback() {
        parent::rollback();
    }

    public function InsertID($name=NULL) {
        return parent::lastInsertId($name);
    }

    public function Prepare($statement) {
        ex_info('Database: Prepare: ' . $statement);
        if ($this->Handle !== NULL)
            $this->Handle->closeCursor();

        $this->Handle = parent::prepare($statement,
                                  array(PDO::ATTR_STATEMENT_CLASS =>
                                        array('DatabaseStatement')));

        if (!$this->Handle instanceof PDOStatement) {
            $error_info = parent::errorInfo();
            throw new Exception('Could not prepare query: ' . $error_info[2]);
        }

        return $this->Handle;
    }

    public function Execute($statement) {
        return parent::exec($statement);
    }

    public function Query($statement) {
        $prepared_statement = $this->Prepare($statement);
        $prepared_statement->Execute();
        return $prepared_statement;
    }

    public function GetRow() {
        return;
    }

    static public function CreateDSN($database, $hostname=NULL, $driver='pgsql') {
        $dsn = $driver . ':';

        if ($hostname == NULL)
            $hostname = 'localhost';

        $dsn .= 'dbname=' . $database . ';host=' . $hostname;
        return $dsn;
    }

    static public function Connect($app, $identifier) {
        $db = $app->Conf['db'][$identifier];
        $dsn = Database::CreateDSN($db['database'], $db['hostname'], $db['driver']);

        $dbh = new Database($app, $dsn, $db['username'], $db['password']);

        if ($app->Conf['debug'] === true)
            $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

        return $dbh;
    }
}

class DatabaseStatement extends PDOStatement {

    public function BindColumn($column, &$parameter, $data_type=NULL) {
        return parent::bindColumn($column, $parameter, $data_type);
    }

    public function BindParam($parameter, &$variable, $data_type=NULL, $length=NULL) {
        return parent::bindParam($parameter, $variable, $data_type, $length);
    }

    public function BindValue($parameter, $value, $data_type=NULL) {
        return parent::bindValue($parameter, $value, $data_type);
    }

    public function CloseCursor() {
        return parent::closeCursor();
    }

    public function ColumnCount() {
        return parent::columnCount();
    }

// PDOStatement::columnCount
// PDOStatement::errorCode
// PDOStatement::errorInfo

    public function Execute($parameters=NULL) {
        return parent::execute($parameters);
    }

    public function Fetch($fetch_style=NULL) {
        return parent::fetch($fetch_style);
    }

    public function FetchAll($fetch_style=NULL) {
        return parent::fetchAll($fetch_style);
    }

    public function FetchColumn($column_number=NULL) {
        return parent::fetchColumn($column_number);
    }

// PDOStatement::fetchObject
// PDOStatement::getAttribute
// PDOStatement::getColumnMeta
// PDOStatement::nextRowset

    public function RowCount() {
        return parent::rowCount();
    }

// PDOStatement::setAttribute
// PDOStatement::setFetchMode

}

?>