mysql 拆分字符串存储过程

原表记录：

存储过程如下：

BEGIN
    DECLARE docter_id_ VARCHAR(20);
    DECLARE topic_id_ VARCHAR(128);
    DECLARE create_time_ DATETIME;
    DECLARE url_ VARCHAR(128);
    DECLARE _done INT DEFAULT 0;
    DECLARE cur_strs CURSOR FOR SELECT docter_id,topic_id,create_time,url from aaa ;
    DECLARE CONTINUE HANDLER FOR NOT FOUND BEGIN SET _done=1; END;

    OPEN  cur_strs;
        FETCH cur_strs INTO docter_id_, topic_id_,create_time_,url_;
        WHILE _done != 1  DO
            DROP TABLE IF EXISTS temp;
            CREATE TABLE temp(topic_id VARCHAR(128));
            SET @b=topic_id_;
      set @c=create_time_;
      set @d=url_;
             SET @a = CONCAT(CONCAT("insert into temp(topic_id) values('",REPLACE(@b,',',"'),('")),"')");
            -- SELECT @a;
             PREPARE sql1 FROM @a;  
            EXECUTE sql1;  
             SELECT docter_id_,t.*,@c,@d FROM temp t;
            INSERT INTO aaaa(docter_id,topic_id,create_time,url) SELECT docter_id_,t.*,@c,@d FROM temp t;
            
            COMMIT;   
            FETCH cur_strs INTO docter_id_, topic_id_,create_time_,url_;
    END WHILE;
    CLOSE cur_strs;
END；

保存存储过程后运行，结果如下：