Php Mysql 简明教程
PHP & MySQL - Database Info Example
MySQL 中有几个重要命令可以在 MySQL 提示符处执行,也可以使用 PHP 等任何脚本来获取有关数据库服务器的各种重要信息。
Sr.No. |
Command & Description |
1 |
SELECT VERSION( ) 服务器版本字符串 |
2 |
SELECT DATABASE( ) 当前数据库名称(如果没有则为空) |
3 |
SELECT USER( ) Current username |
4 |
SHOW STATUS Server status indicators |
5 |
SHOW VARIABLES Server configuration variables |
Example
尝试以下示例以获取数据库信息 −
将以下示例复制粘贴为 mysql_example.php:
<html>
<head>
<title>Getting MySQL Database Info</title>
</head>
<body>
<?php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = 'root@123';
$dbname = 'TUTORIALS';
$mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
$tutorial_count = null;
if($mysqli->connect_errno ) {
printf("Connect failed: %s<br />", $mysqli->connect_error);
exit();
}
printf('Connected successfully.<br />');
if ($result = mysqli_query($mysqli, "SELECT DATABASE()")) {
$row = mysqli_fetch_row($result);
printf("Default database is %s<br />", $row[0]);
mysqli_free_result($result);
}
$mysqli->close();
?>
</body>
</html>