sqlite数据库的update多表关联更新语句,和其他数据库有点小不一样
比如:在sql server中:
用table1的 id 和 table2的 pid,关联table1 和 table2 ,将table2的num字段的值赋给table1的num字段
update table1
set num1 = t2.num2
FROM table1 t1 INNER JOIN table2 t2
ON t1.id=t2.pid;
很容易就关联起来了
sqlite却不支持这种关联,可以这样:
(1)set时,要将table2的num2的值赋给table1的num1字段,要select一下table2,并在括号关联起来
update table1 set num1 = (select num2 from table2 where table2.pid=table1.id)
where...
更新多个字段时:
update table1 set num1 = (select num2 from table2 where table2.pid=table1.id), num11 = (select num22 from table2 where table2.pid=table1.id) where...
(2)where时,也一样,比如我就将上面的改一下
update table1 set num = 99 where table1.id=(select pid from table2 where table2.pid=table1.id)
参考:
http://blog.csdn.net/sky_qing/article/details/8731281