CREATE DEFINER = 'root'@'%'PROCEDURE deyestest.procedure2()BEGIN DECLARE v_id INT; DECLARE v_userName VARCHAR(155); DECLARE v_mobileNum VARCHAR(55); DECLARE v_tmp VARCHAR(1000); DECLARE v_info VARCHAR(2000); DECLARE v_info2 VARCHAR(2000); DECLARE v_int INT; DECLARE v_json LONGTEXT; DECLARE done INT DEFAULT 0; DECLARE myCursor CURSOR FOR SELECT userId , userName , mobileNum FROM user_info ORDER BY userId LIMIT 2, 2; DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET done = 1; OPEN myCursor; SET v_info = concat('{'); REPEAT IF done <> 1 THEN FETCH myCursor INTO v_id, v_userName, v_mobileNum; SET v_tmp = concat('[', v_id, ',', v_userName, ',', v_mobileNum, ']', ','); SET v_info = concat(v_info, v_tmp); FETCH myCursor INTO v_id, v_userName, v_mobileNum;END IF;UNTIL doneEND REPEAT; SET v_int = length(v_info); SET v_info = left(v_info, v_int - 1); SET v_info2 = concat(v_info, '}'); CLOSE myCursor;END代码如上：
主要就是注意循环条件done的使用，当游标取到最后一个数据的下一个不存在的数据时，done会被值为1，那么就要在repeat中进行done的判断，当done不为1的时候，才执行循环。
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