Description
int 
fbsql_errno ( [resource link_identifier] )
     Returns the error number from the last fbsql function, or
     0 (zero) if no error occurred.
    
     Errors coming back from the fbsql database backend don't issue
     warnings. Instead, use fbsql_errno() to
     retrieve the error code. Note that this function only returns the
     error code from the most recently executed fbsql function (not
     including fbsql_error() and
     fbsql_errno()), so if you want to use it, make
     sure you check the value before calling another fbsql function.
     
     
     See also: fbsql_error() and 
     fbsql_warnings().