Question

我试图从数据库表中删除最后插入的Item，但总是得到SQLiteException：near＆＃34; ORDER＆＃34;语法错误（代码1）

android.database.sqlite.SQLiteException: near "ORDER": syntax error (code 1): , while compiling: delete from pending where url = 'server' and mobile_id = '2331' and sent = '0' ORDER BY id DESC LIMIT 1

使用以下查询：

db.execSQL("delete from pending where url = 'server' and mobile_id = '" + string + "' and sent = '0' ORDER BY id DESC LIMIT 1");

Answer 1

使用嵌套查询，如下所示。

db.execSQL("delete from pending where TABLE_ID = (SELECT TABLE_ID from pending where url = 'server' and mobile_id = '" + string + "' and sent = '0' ORDER BY id DESC LIMIT 1"));

TABLE_ID应该是挂起表的唯一键ID。

Answer 2

DELETE FROM table
WHERE ID IN
        (
        SELECT ID
        FROM
            (
                SELECT ID
                FROM table
                WHERE url = 'server' and mobile_id = '2331' and sent = '0' 
                ORDER BY id
                DESC LIMIT 1
            ) a
        )

注意 a 用作子查询的别名

SQLiteException：near＆＃34; ORDER＆＃34;在编译时

2 个答案: