mysql和sqlite php函数有什么区别

Question

我有一个mysql数据库类，想知道如何在保持功能的同时将其转换为sqllite数据库类。

这是班级：

<?php

require_once("config.php");

class MySQLDatabase {

    private $connection;
    public $last_query;
    private $magic_quotes_active;
    private $real_escape_string_exists;

    //This just opens a connection
    function __construct() {
        $this->open_connection();
        $this->magic_quotes_active = get_magic_quotes_gpc();
        $this->real_escape_string_exists = function_exists( "mysql_real_escape_string" ); // i.e. PHP >= v4.3.0

    }

    //This function opens the connection to MySQL 
    //it is called in the __construct()
    public function open_connection() {
        // 1. Create a database connection
        $this->connection = mysql_connect(DB_SERVER, DB_USER, DB_PASS);
        if (!$this->connection) {
            die("Database connection failed: " . mysql_error());
        }else {
            $db_select = mysql_select_db(DB_NAME, $this->connection);
            if (!$db_select) {
                die("Database selection failed: " . mysql_error());
            }
        }
    }

    //This just closes the connection 
    public function close_connection(){
        // 5. Close connection
        if(isset($this->connection)) {
            mysql_close($this->connection);
            unset($this->connection);
        }
    }

    //This will do querys and will retrun the result if 
    //query was successfull
    public function query($sql) {
        $this->last_query = $sql;
        $result = mysql_query($sql, $this->connection);
        $this->confirm_query($result);
        return $result;
    }

    //Preps values to be stored in MySql
    public function escape_value( $value ) {
        if( $this->real_escape_string_exists) { // PHP v4.3.0 or higher
            // undo any magic quote effects so mysql_real_escape_string can do the work
            if( $this->magic_quotes_active ) { $value = stripslashes( $value ); }
            $value = mysql_real_escape_string( $value );
        } else { // before PHP v4.3.0
            // if magic quotes aren't already on then add slashes manually
            if( !$this->magic_quotes_active ) { $value = addslashes( $value ); }
            // if magic quotes are active, then the slashes already exist
        }
        return $value;
    }

    //This fetchs the mysql array and puts it into a php array
    public function fetch_array($result) {
        return mysql_fetch_array($result);
    }

    //This will return the number of rows
    public function num_rows($result){
        return mysql_num_rows($result);
    }

    //This will get the last id insert over the current bd connection
    public function insert_id(){
        return mysql_insert_id($this->connection);
    }

    //This will return the number of rows effected by this query
    public function affected_rows() {
        return mysql_affected_rows($this->connection);
    }

    //Confirms queries, is called in query()
    private function confirm_query($result) {
    if (!$result) {
        $output = "Database query failed: " . mysql_error() . "<br />";
        $output.= "Last SQL Query: ".$this->last_query;
        die($output);
    }
}
}

$database = new MySQLDatabase();

//This code should be used on pages that require a DB
//We load the database class with creates an
//instance of $database
//*require_once("../includes/database.php");
//Now we check to make sure that it worked
//**if(isset($database)) {echo "Database: true";} else{echo "Database: false";}
//**echo "<hr />";
?>

这是配置：

<?php

//Database Constants
defined('DB_SERVER') ? null :  define("DB_SERVER", "private");
defined('DB_USER') ? null :  define("DB_USER", "private");
defined('DB_PASS') ? null :  define("DB_PASS" ,"private" );
defined('DB_NAME') ? null :  define("DB_NAME", "private" );

?>