Re: [Boost-users] [boost::system] Is the library abstraction general enough?

Subject: Re: [Boost-users] [boost::system] Is the library abstraction general enough?
From: Lian Cheng (rhythm.mail_at_[hidden])
Date: 2009-02-23 05:33:09

Boris Schaeling:
> On Fri, 20 Feb 2009 09:36:53 +0100, Lian Cheng <rhythm.mail_at_[hidden]> 
> wrote:
> 
> Isn't there a list of error numbers and error strings MySQL uses? I ask 
> as calling error_category::message() should also return an error string 
> even if no MySQL connection is used?

Unfortunately, no. As I've mentioned, the error strings MySQL uses are 
printf format strings, such as:

     Using unsupported buffer type: %d  (parameter: %d)

And you always need an active MySQL connection handle to obtain the full 
error message by calling mysql_error(). And you can never get the 
message back once you close the connection:

     MYSQL* conn = mysql_init( 0 );
     // do something causes an error.
     mysql_close( conn );
     printf( "error: %s", mysql_error( conn ) ); // Messed up.

> 
> Boris