存储过程

DROP PROCEDURE IF EXISTS teach.sp_Score_Level;
CREATE PROCEDURE `sp`()
BEGIN
declare cur_stu_id int;
declare cur_course_id int;
declare cur_grade varchar(10);

DECLARE done INT DEFAULT 0;
declare score_cur cursor for select stu_id,course_id,grade from t_score;

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
open score_cur;
REPEAT
fetch score_cur into cur_stu_id,cur_course_id,cur_grade;
if done=0 then
if cur_grade>=90 then
insert into t_score_level(stu_id,course_id,scorelevel) values(cur_stu_id,cur_course_id,'优');
elseif cur_grade>=70 then
insert into t_score_level(stu_id,course_id,scorelevel) values(cur_stu_id,cur_course_id,'良');
elseif cur_grade>=60 then
insert into t_score_level(stu_id,course_id,scorelevel) values(cur_stu_id,cur_course_id,'中');
else
insert into t_score_level(stu_id,course_id,scorelevel) values(cur_stu_id,cur_course_id,'差');
end if;
end if;
UNTIL done=1 END REPEAT;
close score_cur;

select * from t_score_level;

END;

create table t_score_level(
stu_id int,
course_id int,
scorelevel varchar(20));
alter table t_score_level convert to character set utf8

using (MySqlConnection conn = new MySqlConnection("server=localhost;User Id=root;password=;Database=teach"))
{
MySqlCommand cmd = new MySqlCommand("sp_Score_Level", conn);
cmd.CommandType=CommandType.StoredProcedure;
MySqlDataAdapter ad = new MySqlDataAdapter(cmd);
DataSet ds = new DataSet();
ad.Fill(ds);
this.dataGridView1.DataSource = ds.Tables[0];

}