Руководство по PHP
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mysql_error

(PHP 3, PHP 4 )

mysql_error --  Returns the text of the error message from previous MySQL operation

Description

string mysql_error ( [resource link_identifier])

Returns the error text from the last MySQL function, or '' (the empty string) if no error occurred.

Errors coming back from the MySQL database backend no longer issue warnings. Instead, use mysql_error() to retrieve the error text. Note that this function only returns the error text from the most recently executed MySQL function (not including mysql_error() and mysql_errno()), so if you want to use it, make sure you check the value before calling another MySQL function.

Пример 1. mysql_error Example

<?php
    mysql_connect("localhost", "mysql_user", "mysql_password");

    mysql_select_db("nonexistentdb");
    echo mysql_errno() . ": " . mysql_error(). "\n";

    mysql_select_db("kossu");
    mysql_query("SELECT * FROM nonexistenttable");
    echo mysql_errno() . ": " . mysql_error() . "\n";
?>

The above example would produce the following output: 

1049: Unknown database 'nonexistentdb'
1146: Table 'kossu.nonexistenttable' doesn't exist

Замечание: If the optional argument is specified the given link is used to retrieve the error message. If not, the last opened link is used.

See also: mysql_errno()

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mysql_errnoУровень вышеmysql_escape_string