1 /* 2 Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 3 4 This program is free software; you can redistribute it and/or modify 5 it under the terms of the GNU General Public License as published by 6 the Free Software Foundation; version 2 of the License. 7 8 This program is distributed in the hope that it will be useful, 9 but WITHOUT ANY WARRANTY; without even the implied warranty of 10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License 14 along with this program; if not, write to the Free Software 15 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 16 */ 17 18 #ifndef SQL_CALLBACK_INCLUDED 19 #define SQL_CALLBACK_INCLUDED 20 21 /** 22 Macro used for an internal callback. 23 24 The macro will check that the object exists and that the function 25 is defined. If that is the case, it will call the function with the 26 given parameters. 27 28 If the object or the function is not defined, the callback will be 29 considered successful (nothing needed to be done) and will 30 therefore return no error. 31 */ 32 33 #define MYSQL_CALLBACK(OBJ, FUNC, PARAMS) \ 34 do { \ 35 if ((OBJ) && ((OBJ)->FUNC)) \ 36 (OBJ)->FUNC PARAMS; \ 37 } while (0) 38 39 #define MYSQL_CALLBACK_ELSE(OBJ, FUNC, PARAMS, ELSE) \ 40 (((OBJ) && ((OBJ)->FUNC)) ? (OBJ)->FUNC PARAMS : (ELSE)) 41 42 43 #endif /* SQL_CALLBACK_INCLUDED */ 44