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View File Name : signal_demo3.test

#
# 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;