select t1.class_id, t1.dept_id, t1.school_id, t1.year, t1.name, t1.online, t1.status, t1.stats, t1.create_time, t1.update_time,t1.is_default,
t2.id, t2.name school_name, t2.dept_id, t2.pro, t2.city, t2.area
from dz_classes t1
left join dz_school t2 on t1.school_id=t2.id
insert into dz_classes
dept_id,
school_id,
year,
name,
online,
status,
stats,
create_time,
update_time,
is_default,
#{deptId},
#{schoolId},
#{year},
#{name},
#{online},
#{status},
#{stats},
#{createTime},
#{updateTime},
#{isDefault},
update dz_classes
dept_id = #{deptId},
school_id = #{schoolId},
year = #{year},
name = #{name},
online = #{online},
status = #{status},
stats = #{stats},
create_time = #{createTime},
update_time = #{updateTime},
is_default = #{isDefault},
where class_id = #{classId}
delete from dz_classes where class_id = #{classId}
delete from dz_classes where class_id in
#{classId}