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# mysql_errno

(PHP 3, PHP 4 , PHP 5)

mysql_errno -- Returns the numerical value of the error message from previous MySQL operation

## Description

int mysql_errno ( [resource link_identifier])

Returns the error number from the last MySQL function, or 0 (zero) if no error occurred.

Errors coming back from the MySQL database backend no longer issue warnings. Instead, use mysql_errno() to retrieve the error code. Note that this function only returns the error code 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.

示範 1.mysql_errno() example
`<?php $link = mysql_connect("localhost", "mysql_user", "mysql_password"); if (!mysql_select_db("nonexistentdb", $link)) { echo mysql_errno($link) . ": " . mysql_error($link). "\n"; } mysql_select_db("kossu", $link); if (!mysql_query("SELECT * FROM nonexistenttable", $link)) { echo mysql_errno($link) . ": " . mysql_error($link) . "\n"; } ?>`
The above example would produce the following output:
    1049: Unknown database 'nonexistentdb'
    1146: Table 'kossu.nonexistenttable' doesn't exist

> 備注: If the optional argument is specified the given link is used to retrieve the error code. If not, the last opened link is used.

See also mysql_error() and MySQL error codes.

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