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 22.2.3.12 `mysql_errno()'
 .........................
 
 `unsigned int mysql_errno(MYSQL *mysql)'
 
 Description
 ...........
 
 For the connection specified by `mysql', `mysql_errno()' returns the
 error code for the most recently invoked API function that can succeed
 or fail.  A return value of zero means that no error occurred. Client
 error message numbers are listed in the MySQL `errmsg.h' header file.
 Server error message numbers are listed in `mysqld_error.h'. In the
 MySQL source distribution you can find a complete list of error
 messages and error numbers in the file `Docs/mysqld_error.txt'.  The
 server error codes also are listed at  Error-handling.
 
 Note that some functions like `mysql_fetch_row()' don't set
 `mysql_errno()' if they succeed.
 
 A rule of thumb is that all functions that have to ask the server for
 information will reset `mysql_errno()' if they succeed.
 
 Return Values
 .............
 
 An error code value for the last `mysql_XXX()' call, if it failed.
 zero means no error occurred.
 
 Errors
 ......
 
 None.
 
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