Documentation Home
MySQL 8.0 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 46.0Mb
PDF (A4) - 46.0Mb
PDF (RPM) - 41.4Mb
HTML Download (TGZ) - 10.6Mb
HTML Download (Zip) - 10.6Mb
HTML Download (RPM) - 9.1Mb
Man Pages (TGZ) - 218.8Kb
Man Pages (Zip) - 324.0Kb
Info (Gzip) - 4.1Mb
Info (Zip) - 4.1Mb
Excerpts from this Manual

28.7.7.15 mysql_error()

const char *mysql_error(MYSQL *mysql)

Description

For the connection specified by mysql, mysql_error() returns a null-terminated string containing the error message for the most recently invoked API function that failed. If a function did not fail, the return value of mysql_error() may be the previous error or an empty string to indicate no error.

A rule of thumb is that all functions that have to ask the server for information reset mysql_error() if they succeed.

For functions that reset mysql_error(), either of these two tests can be used to check for an error:

if(*mysql_error(&mysql))
{
  // an error occurred
}

if(mysql_error(&mysql)[0])
{
  // an error occurred
}

The language of the client error messages may be changed by recompiling the MySQL client library. You can choose error messages in several different languages. See Section 10.11, “Setting the Error Message Language”.

Return Values

A null-terminated character string that describes the error. An empty string if no error occurred.

Errors

None.