Question

我想从我的数据库表 User 中只删除一行。

我尝试了this，但我不知道如何使用SQLITE_ENABLE_UPDATE_DELETE_LIMIT。

这是我的代码：

    SQLiteDatabase sqLiteDatabase = this.openOrCreateDatabase("User", MODE_PRIVATE, null);

        //sqLiteDatabase.execSQL("INSERT INTO user (name, age) VALUES ('jihyo', 10)");

        sqLiteDatabase.execSQL("DELETE FROM user WHERE name ='jihyo' LIMIT 1");
        Cursor c = sqLiteDatabase.rawQuery("SELECT * FROM user WHERE name = 'jihyo'", null);
        int nameIndex = c.getColumnIndex("name");
        int ageIndex = c.getColumnIndex("age");

        c.moveToFirst();
        do {
            Log.v("name", c.getString(nameIndex));
            Log.v("age", c.getString(ageIndex));
        } while (c.moveToNext());

这是错误：

android.database.sqlite.SQLiteException：near“LIMIT”：语法错误（代码1）:,编译时：DELETE FROM user WHERE name ='jihyo' 限制1

Answer 1

您无法在删除查询中应用限制，因为删除条款没有 LIMIT 所以你可以使用 SELECT 查询选择单个记录并在基础上应用 DELETE 所选查询例如。

DELETE FROM user WHERE id IN
 (SELECT id FROM user
 WHERE name = 'jihyo'
 LIMIT 1);

注意：您可以使用'='代替'IN'

Answer 2

试试这个：

db.execSQL("Delete from user where user_id IN (Select user_id from user where name = 'jihyo' limit 1)");

[已更新]：=无法使用LIMIT操作，因此您需要按照以下方式进行操作：

Cursor c = db.execSQL("Select user_id from user where name = 'jihyo' limit 1");
        if (c.moveToFirst()){
            String id = c.getString(0);
            db.execSQL("Delete from user where user_id = "+id);
        }

Android SQLite如何删除限制

2 个答案: