处理存储过程中select语句返回的行

Question

有没有人能告诉我如何获取行，但在stored procedure内？

比方说，比如我做

BEGIN 
    SELECT id, name, lastname, 
    FROM eyploees; 

    --How can i process all the results within this procedure? 

END<br/> 

Answer 1

你需要使用游标：

DECLARE id_var INT; 
DECLARE name_var VARCHAR(255); 
DECLARE lastname_var VARCHAR(255); 

DECLARE my_cursor CURSOR FOR SELECT id, name, lastname FROM employees; 

DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE; 

OPEN my_cursor; 

read_loop: LOOP 

    FETCH my_cursor INTO id_var, name_var, lastname_var; 
    IF done THEN 
     LEAVE read_loop; 
    END IF; 

    --Do some row work here using _var variables from above 

END LOOP; 

CLOSE my_cursor;