<?php

/**
 * Project: Guestbook Sample Smarty Application
 * Author: Monte Ohrt <monte [AT] ohrt [DOT] com>
 * Date: March 14th, 2005
 * File: sql.lib.php
 * Version: 1.0
 */

// define the query types
define('SQL_NONE', 1);
define('SQL_ALL', 2);
define('SQL_INIT', 3);

// define the query formats
define('SQL_ASSOC', 1);
define('SQL_INDEX', 2);

class SQL {
    
    var $db = null;
    var $result = null;
    var $error = null;
    var $record = null;
    
    /**
     * class constructor
     */
    function SQL() { }
    
    /**
     * connect to the database
     *
     * @param string $dsn the data source name
     */
    function connect($dsn) {
        $this->db = DB::connect($dsn);

        if(DB::isError($this->db)) {
            $this->error = $this->db->getMessage();
            return false;
        }        
        return true;
    }
    
    /**
     * disconnect from the database
     */
    function disconnect() {
        $this->db->disconnect();   
    }
    
    /**
     * query the database
     *
     * @param string $query the SQL query
     * @param string $type the type of query
     * @param string $format the query format
     */
    function query($query, $type = SQL_NONE, $format = SQL_INDEX) {

		$this->record = array();
		$_data = array();
        
		// determine fetch mode (index or associative)
        $_fetchmode = ($format == SQL_ASSOC) ? DB_FETCHMODE_ASSOC : null;
        
        $this->result = $this->db->query($query);
        if (DB::isError($this->result)) {
            $this->error = $this->result->getMessage();
            return false;
        }
        switch ($type) {
            case SQL_ALL:
				// get all the records
                while($_row = $this->result->fetchRow($_fetchmode)) {
                    $_data[] = $_row;   
                }
                $this->result->free();            
                $this->record = $_data;
                break;
            case SQL_INIT:
				// get the first record
                $this->record = $this->result->fetchRow($_fetchmode);
                break;
            case SQL_NONE:
            default:
				// records will be looped over with next()
                break;   
        }
        return true;
    }
    
    /**
     * connect to the database
     *
     * @param string $format the query format
     */
    function next($format = SQL_INDEX) {
		// fetch mode (index or associative)
        $_fetchmode = ($format == SQL_ASSOC) ? DB_FETCHMODE_ASSOC : null;
        if ($this->record = $this->result->fetchRow($_fetchmode)) {
            return true;
        } else {
            $this->result->free();
            return false;
        }
            
    }
    
}

?>