Question

我试图通过cron job连接到我的数据库。但是我一直收到错误消息。经过许多令人沮丧的时间后，我在这里寻求帮助。

我的cron脚本php文件：

 <?php
 define("HOST","localhost");
 define("USERNAME","user_muser");
 define("PASSWORD","*********");
 define("DB_DATABASE","databasename");

 $conn = mysqli_connect('HOST', 'USERNAME', 'PASSWORD','DB_DATABASE');

// Check connection
if (mysqli_connect_errno())
{
 "Failed to connect to MySQL: " . mysqli_connect_error();
}
// Check if server is alive
if (mysqli_ping($conn))
{
 "Connection is ok!";
}
else
{
"Error: ". mysqli_error($conn);
}
mysqli_close($conn);
?>

这是我收到的错误：

mysqli_connect(): (HY000/2005): Unknown MySQL server host 'HOST' (0)
mysqli_ping() expects parameter 1 to be mysqli
mysqli_error() expects parameter 1 to be mysqli
mysqli_close() expects parameter 1 to be mysqli

有任何帮助吗？谢谢！

Answer 1

你引用了常量，这使得它们成为字符串。

 define("HOST","localhost");
 define("USERNAME","user_muser");
 define("PASSWORD","*********");
 define("DB_DATABASE","databasename");

 $conn = mysqli_connect(HOST, USERNAME, PASSWORD, DB_DATABASE);

Answer 2

您应该使用以下引号编写constants。否则它们是通常的字符串。

 $conn = mysqli_connect(HOST, USERNAME, PASSWORD,DB_DATABASE);

Cron作业返回错误消息

2 个答案: