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#
# Demonstrate how RESIGNAL can be used to print a stack trace
#
# Save defaults
SET @start_global_value = @@global.max_error_count;
SELECT @start_global_value;
SET @start_session_value = @@session.max_error_count;
SELECT @start_session_value;
--disable_warnings
drop database if exists demo;
--enable_warnings
create database demo;
use demo;
delimiter $$;
create procedure proc_1()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_1';
call proc_2();
end
$$
create procedure proc_2()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_2';
call proc_3();
end
$$
create procedure proc_3()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_3';
call proc_4();
end
$$
create procedure proc_4()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_4';
call proc_5();
end
$$
create procedure proc_5()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_5';
call proc_6();
end
$$
create procedure proc_6()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_6';
call proc_7();
end
$$
create procedure proc_7()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_7';
call proc_8();
end
$$
create procedure proc_8()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_8';
call proc_9();
end
$$
create procedure proc_9()
begin
declare exit handler for sqlexception
resignal sqlstate '45000' set message_text='Oops in proc_9';
## Do something that fails, to see how errors are reported
drop table oops_it_is_not_here;
end
$$
delimiter ;$$
-- error ER_SIGNAL_EXCEPTION
call proc_1();
# This is the interesting part:
# the complete call stack from the origin of failure (proc_9)
# to the top level caller (proc_1) is available ...
show warnings;
SET @@session.max_error_count = 5;
SELECT @@session.max_error_count;
-- error ER_SIGNAL_EXCEPTION
call proc_1();
show warnings;
SET @@session.max_error_count = 7;
SELECT @@session.max_error_count;
-- error ER_SIGNAL_EXCEPTION
call proc_1();
show warnings;
SET @@session.max_error_count = 9;
SELECT @@session.max_error_count;
-- error ER_SIGNAL_EXCEPTION
call proc_1();
show warnings;
drop database demo;
# Restore defaults
SET @@global.max_error_count = @start_global_value;
SELECT @@global.max_error_count;
SET @@session.max_error_count = @start_session_value;
SELECT @@session.max_error_count;