1.删除老师发布的讨论任务,发布时间是2015-5-8,2015-5-9
(1)任务表中存放着资源活动的id,没有存放资源活动的类型,所以要关联才能查询出讨论活动的任务
(2)mysql中不能drop 数据where条件的子查询使用本表查询,所以考虑使用mysql的迭代器(之前使用过oracle的迭代器),但是mysql中没有迭代器,所以只能临时表存放数据。
(3)临时表用完后,要删除临时表
具体操作步骤:
(1).满足发布时间在2015-5-8,2015-5-9的tccsq001老师发布的讨论任务的id,存放在临时表tmp_table_shiyanban中。
CREATE TEMPORARY TABLE tmp_table_shiyanban SELECT gm_task.id FROM gm_task,gm_activity_resource WHERE gm_task.activity_id=gm_activity_resource.id AND
gm_task.teacher_id=(SELECT id FROM gm_user WHERE u_num='tccsq001')
AND gm_activity_resource.type=4
AND DATE_FORMAT(gm_task.create_time,'%Y-%m-%d') IN
('2015-05-10','2015-05-11')
(2)删除老师的任务
DELETE FROM gm_task WHERE id IN (SELECT * FROM tmp_table_shiyanban)
(3)删除任务对应的学生任务
DELETE FROM gm_user_tasks_list WHERE task_id IN (SELECT * FROM tmp_table_shiyanban)
(4)删除临时表
DROP TEMPORARY TABLE tmp_table_shiyanban
2.更新老师发布任务的资源互动名称
SELECT * FROM gm_task,gm_activity_resource WHERE gm_task.activity_id=gm_activity_resource.id AND
gm_task.teacher_id=(SELECT id FROM gm_user WHERE u_num='tccsq001')
AND gm_activity_resource.type=4
AND DATE_FORMAT(gm_task.create_time,'%Y-%m-%d') IN
('2015-04-10','2015-04-01')
CREATE TEMPORARY TABLE tmp_table_shiyanban SELECT gm_task.id FROM gm_task,gm_activity_resource WHERE gm_task.activity_id=gm_activity_resource.id AND
gm_task.teacher_id=(SELECT id FROM gm_user WHERE u_num='tccsq001')
AND gm_activity_resource.type=4
AND DATE_FORMAT(gm_task.create_time,'%Y-%m-%d') IN
('2015-05-10','2015-05-11')
SELECT * FROM gm_task,gm_activity_resource WHERE gm_task.activity_id=gm_activity_resource.id AND
gm_task.teacher_id=(SELECT id FROM gm_user WHERE u_num='tccsq001')
AND gm_activity_resource.type=4
AND DATE_FORMAT(gm_task.create_time,'%Y-%m-%d') IN
('2015-05-10','2015-05-11')
SELECT * FROM gm_activity_resource WHERE id='824b3b11-8c86-4295-acc9-4e6770756410';
UPDATE gm_activity_resource SET NAME="OK1" WHERE id='824b3b11-8c86-4295-acc9-4e6770756410';
SELECT * FROM gm_user_tasks_list WHERE activity_id ='824b3b11-8c86-4295-acc9-4e6770756410'
UPDATE gm_user_tasks_list SET NAME='ok1' WHERE activity_id ='824b3b11-8c86-4295-acc9-4e6770756410'