drop table if exists t1;
create table t1 (
a int not null primary key,
b int not null
) engine=ndb;
insert into t1 values (1,10), (2,20), (3,100), (4, 100);
create procedure test_proc1 (in var_in int)
begin
select * from t1 where a = var_in;
end;
create procedure test_proc2 (out var_out int)
begin
select b from t1 where a = 1 into var_out;
end;
create procedure test_proc3 (inout var_inout int)
begin
select b from t1 where a = var_inout into var_inout;
end;
//
call test_proc1(1);
a	b
1	10
call test_proc2(@test_var);
select @test_var;
@test_var
10
set @test_var = 1;
call test_proc3(@test_var);
select @test_var;
@test_var
10
alter procedure test_proc1 comment 'new comment';
show create procedure test_proc1;
Procedure	sql_mode	Create Procedure	character_set_client	collation_connection	Database Collation
test_proc1		CREATE DEFINER=`root`@`localhost` PROCEDURE `test_proc1`(in var_in int)
    COMMENT 'new comment'
begin
select * from t1 where a = var_in;
end	latin1	latin1_swedish_ci	latin1_swedish_ci
drop procedure test_proc1;
drop procedure test_proc2;
drop procedure test_proc3;
drop table t1;
End of 5.1 tests