[英]db connection in class PHP
在类中使数据库连接可用的最快,最简单的方法是什么,以便该类中的所有公共函数都可以访问它,以及如何在函数中调用它?
Save the connection handle as a class variable. 将连接句柄另存为类变量。
class Test
{
public $dbh;
public function connect($host,$username,$password,$dbname)
{
$this->dbh = mysql_connect($host,$username,$password); //Of course, you'd want to do some actual error checking. Also, you can have a separate function for selecting the DB if you need to use multiple databases
mysql_select_db($dbname,$this->dbh); //You use $this->variable to refer to the connection handle
}
public function query($sql)
{
return mysql_query($sql,$this->dbh);
}
}
Or you can use the __construct() method of the class which is called automatically whenever a new object is initialized.. 或者您可以使用类的__construct()方法,只要初始化新对象,该方法就会自动调用。
class MySQLDatabase {
private $connection;
function __construct() {
$this->open_connection();
}
public function open_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());
}
}
}
public function query($sql) {
$result = mysql_query($sql, $this->connection);
return $result;
}
}
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