Question

我正在构建一个带安装的项目（suck as WordPress），用户提供数据库信息（服务器，用户名，密码和数据库）。现在，我必须检查它是否可以连接到提供的数据库。我尝试了这段代码，但似乎它不起作用（我正在使用Mysqli顺便说一句）：

public function checkDataBaseConnection($server, $user, $pass, $db)
{
    $conn = @mysqli_connect($server, $user, $pass, $db);
    if(mysqli_connect_error())
    {
        return FALSE;
    }
    else
    {
        mysqli_close($conn);
        return TRUE;
    }
}

我还可以使用其他方法来检查服务器是否可以连接到数据库？

Answer 1

一件事：删除@，这会抑制一些php警告。

第二件事：试试这个：

public function checkDataBaseConnection($server, $user, $pass, $db)
{
    $conn = @mysqli_connect($server, $user, $pass, $db);
    if(!$conn)
    {
        return FALSE;
    }
    else
    {
        //mysqli_close($conn); why would you close the connection?
        return $conn;
    }
}

Answer 2

你尝试过这样的事吗？

if (checkDataBaseConnection($server, $user, $pass, $db))
   echo "Success!";
else
   echo "Fail.";

顺便说一句，你可以这样做

mysqli_connect($server, $user, $pass) or die('Connection failed');

Answer 3

好吧，如果你查看mysqli_connect的PHP页面，你可以看到这个例子：

<?php
$mysqli = new mysqli('localhost', 'my_user', 'my_password', 'my_db');

/*
 * This is the "official" OO way to do it,
 * BUT $connect_error was broken until PHP 5.2.9 and 5.3.0.
 */
if ($mysqli->connect_error) {
    die('Connect Error (' . $mysqli->connect_errno . ') '
            . $mysqli->connect_error);
}

/*
 * Use this instead of $connect_error if you need to ensure
 * compatibility with PHP versions prior to 5.2.9 and 5.3.0.
 */
if (mysqli_connect_error()) {
    die('Connect Error (' . mysqli_connect_errno() . ') '
            . mysqli_connect_error());
}

echo 'Success... ' . $mysqli->host_info . "\n";

$mysqli->close();
?>

PHP检查mysql连接

3 个答案: