/usr/lib/mysql-testsuite/t/signal_demo2.test is in mysql-testsuite-5.6 5.6.16-1~exp1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 | #
# Demonstrate how RESIGNAL can be used to 'catch' and 're-throw' an error
#
--disable_warnings
drop database if exists demo;
--enable_warnings
create database demo;
use demo;
delimiter $$;
create procedure proc_top_a(p1 integer)
begin
## DECLARE CONTINUE HANDLER for SQLEXCEPTION, NOT FOUND
begin
end;
select "Starting ...";
call proc_middle_a(p1);
select "The end";
end
$$
create procedure proc_middle_a(p1 integer)
begin
DECLARE l integer;
# without RESIGNAL:
# Should be: DECLARE EXIT HANDLER for SQLEXCEPTION, NOT FOUND
DECLARE EXIT HANDLER for 1 /* not sure how to handle exceptions */
begin
select "Oops ... now what ?";
end;
select "In prod_middle()";
create temporary table t1(a integer, b integer);
select GET_LOCK("user_mutex", 10) into l;
insert into t1 set a = p1, b = p1;
call proc_bottom_a(p1);
select RELEASE_LOCK("user_mutex") into l;
drop temporary table t1;
end
$$
create procedure proc_bottom_a(p1 integer)
begin
select "In proc_bottom()";
if (p1 = 1) then
begin
select "Doing something that works ...";
select * from t1;
end;
end if;
if (p1 = 2) then
begin
select "Doing something that fail (simulate an error) ...";
drop table no_such_table;
end;
end if;
if (p1 = 3) then
begin
select "Doing something that *SHOULD* works ...";
select * from t1;
end;
end if;
end
$$
delimiter ;$$
#
# Code without RESIGNAL:
# errors are apparent to the caller,
# but there is no cleanup code,
# so that the environment (get_lock(), temporary table) is polluted ...
#
call proc_top_a(1);
# Expected
--error ER_BAD_TABLE_ERROR
call proc_top_a(2);
# Dirty state
--error ER_TABLE_EXISTS_ERROR
call proc_top_a(3);
# Dirty state
--error ER_TABLE_EXISTS_ERROR
call proc_top_a(1);
drop temporary table if exists t1;
delimiter $$;
create procedure proc_top_b(p1 integer)
begin
select "Starting ...";
call proc_middle_b(p1);
select "The end";
end
$$
create procedure proc_middle_b(p1 integer)
begin
DECLARE l integer;
DECLARE EXIT HANDLER for SQLEXCEPTION, NOT FOUND
begin
begin
DECLARE CONTINUE HANDLER for SQLEXCEPTION, NOT FOUND
begin
/* Ignore errors from the cleanup code */
end;
select "Doing cleanup !";
select RELEASE_LOCK("user_mutex") into l;
drop temporary table t1;
end;
RESIGNAL;
end;
select "In prod_middle()";
create temporary table t1(a integer, b integer);
select GET_LOCK("user_mutex", 10) into l;
insert into t1 set a = p1, b = p1;
call proc_bottom_b(p1);
select RELEASE_LOCK("user_mutex") into l;
drop temporary table t1;
end
$$
create procedure proc_bottom_b(p1 integer)
begin
select "In proc_bottom()";
if (p1 = 1) then
begin
select "Doing something that works ...";
select * from t1;
end;
end if;
if (p1 = 2) then
begin
select "Doing something that fail (simulate an error) ...";
drop table no_such_table;
end;
end if;
if (p1 = 3) then
begin
select "Doing something that *SHOULD* works ...";
select * from t1;
end;
end if;
end
$$
delimiter ;$$
#
# Code with RESIGNAL:
# errors are apparent to the caller,
# the but cleanup code did get a chance to act ...
#
call proc_top_b(1);
--error ER_BAD_TABLE_ERROR
call proc_top_b(2);
call proc_top_b(3);
call proc_top_b(1);
drop database demo;
|