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];

            
            }