How to output sql execution error message in php

How to output sql execution error information in php: first create a PHP sample file; then connect to the mysql database; finally output the sql execution error information through "echo mysql_error();".

The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer

How does php output sql execution error message?

PHP print database error message

$link = @mysql_connect("服务器", "账号", "密码") or die("自己的错误解释".mysql_error());   
echo mysql_error(); //打印数据错误信息

mysql_error() Function introduction:

mysql_error() function returns the text error message generated by the previous MySQL operation.

This function returns the error text of the previous MySQL function, or '' (empty string) if there is no error.

Syntax

mysql_error(connection)

Parameters

connection Optional. Specifies the SQL connection identifier. If not specified, the last opened connection is used.

Example

In this example, we will try to log in to a MySQL server using an incorrect username and password:

<?php
$con = mysql_connect("localhost","wrong_user","wrong_pwd");
if (!$con)
  {
  die(mysql_error());
  }
mysql_close($con);
?>

The output will be similar to:

Access denied for user 'wrong_user'@'localhost'
(using password: YES)

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