SQLite条件插入或者替换

Question

需要网sqlite数据库中插入或替换记录，并且更新条件是，新的值大于旧的值。

schema：

 CREATE table IF NOT EXISTS SearchTable
   (Owner INTEGER PRIMARY KEY, Generations INTEGER DEFAULT 0)

试过下面的命令：

INSERT OR REPLACE INTO SearchTable(Owner, Generations)
 VALUES (?, MAX((SELECT Generations FROM SearchTable WHERE Owner = ?), ?))

但是返回的结果是空值。

Answer 1

INSERT OR REPLACE INTO SearchTable(Owner, Generations) SELECT 5, MIN(3, COALESCE(Generations, 999)) FROM SearchTable WHERE Owner = 5

试试吧