How to get database in php using class & function oops concepts - php

Question

I am new developer in php. I'm writing below code a class and functions to connect to the database. but code was not working how to create class and function oops concept help me.
code:
class database {
#code
var $host = "localhost";
var $username ="root";
var $password ="";
var $dbase ="blue";
var $myconnect;
function connectTodata()
{
$conn = mysql_connect($this->host, $this->username, $this->password);
if(!$conn)
{
die("Cannot Connect to the datagase");
}
else
{
$his->myconnect = $conn;
echo "Connect Established";
}
return $myconnect;
}
function selectDatabase() // selecting the database.
{
mysql_select_db($this->database); //use php inbuild functions for select database
if(mysql_error()) // if error occured display the error message
{
echo "Cannot find the database ".$this->database;
}
echo "Database selected..";
}
function closeConnection() // close the connection
{
mysql_close($this->myconn);
echo "Connection closed";
}
}

Answer 1

Just to make it work:
class database
{
#code
var $host = "localhost";
var $username ="root";
var $password ="";
var $dbase ="blue";
var $myconnect;
function connectTodata()
{
$this->myconnect = mysql_connect($this->host, $this->username, $this->password);
if(!$this->myconnect) die("Cannot Connect to the datagase");
echo "Connect Established";
return $this->myconnect;
}
function selectDatabase() // selecting the database.
{
mysql_select_db($this->database); //use php inbuild functions for select database
if(mysql_error()) // if error occured display the error message
{
echo "Cannot find the database ".$this->database;
}
echo "Database selected..";
}
function closeConnection() // close the connection
{
mysql_close($this->myconnect);
echo "Connection closed";
}
}

Answer 2

Fix the errors as described by the previous posters, then try this to start:
$database_connection=new database();
$database_handle=$database_connection->connectTodata();
$database_connection->selectDatabase();
$database_connection->closeConnection();
unset($database_connection);
exit();
and in the space between the chunks of code, you can add your mysql queries and use $database_handle as the second parameter.

Answer 3

you can use constructor so that you don't need to call class function everytime :
class database {
var $host = "localhost";
var $username ="root";
var $password ="";
var $dbase ="blue";
var $myconnect;
function __construct() {
$this->myconnect = mysql_connect($this->host, $this->username, $this->password);
if( !$this->myconnect ) {
$msg = "could not connect to mysql database <Br/>";
$msg .= mysql_error();
die($msg);
}
$db_connect = mysql_select_db($this->dbase, $this->myconnect);
if( !$db_connect ) {
die(" can not select database \n".mysql_error());
}
}
function __destruct() {
mysql_close($this->myconnect);
}
}
// call database
$con = new database();

Answer 4

You can do it with the help of Defining them something like
define("DB_SERVER_NAME","your host");
define("DB_USER_NAME","your user name");
define("DB_USER_PASSWORD","your password");
define("DB_DATABASE_NAME","your database");
now the connection file:
class DBClass{
public $DB_LINK;
public $DB_DATABASE_NAME;
function DBClass($Main_DB = FALSE){
$this->DB_LINK = #mysqli_connect(DB_SERVER_NAME,DB_USER_NAME,DB_USER_PASSWORD,DB_DATABASE_NAME);
if(! $this->DB_LINK){
die("<h2>Could not connect to Database.</h2>");
}
}
function __destruct(){
mysqli_close($this->DB_LINK);
}
}
This works perfectly for me