如何从MySQL获取最后一条错误消息？

Question

I'm using debug_backtrace() and some basic styling to log my website errors.

if (@mysql_error($this->conn))
   $error = 'mysql_error() response: ' . @mysql_error($this->conn);
else
   $error = 'non mysql error\r\n';

Sometimes it doesn't work. My log files are full of "non mysql error" but the errors always appear in functions which has database connections. Like, getAllNews() function fails, but it logs it as non mysql error.

How can I log errors of my website and mysql correctly?

Answer 1

I think you need to log error immediately after "error-able" mysql functions. And AFAIK, all error-able functions return FALSE on error, so you can check as below;

<?php
public function errorLog($error) {
    // concat error with mysql error
    $error .= $this->conn
        ? mysql_error($this->conn)
        : mysql_error();
    // log error
    error_log($error);
    // keep last error
    $this->_lastError = $error;
}

...

// remember suppressing error throws (with "@" sign)
$this->conn =@ mysql_connect(...);
if (false === $this->conn) {
    $this->errorLog("Connection failed: ");
}
//or
$query =@ mysql_query(...);
if (false === $query) {
    $this->errorLog("Query failed: ");
}
?>