Android SQLite多WHERE

Question

我一直在寻找它，但找不到我需要的东西。我在 android 中有一个 SQLite 表，我想知道 rawquery 将如何用于多个 WHERE 子句。我的意思是，我想知道一个表的所有记录以及其中两个列的值为 1 的所有列。

我该怎么做？

我试过:

String selectQuery = "SELECT  * FROM " + TABLE_NAME 
        + " WHERE " + KEY_ONE + " = " + String.valueOf(var1)
        + " AND WHERE " + KEY_TWO + " = " + String.valueOf(Var2);

SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);

但它不起作用..

谢谢你的帮助:D

Answer 1

删除第二个WHERE:

+ " AND " + KEY_TWO + " = " + String.valueOf(Var2);

另请注意，字符串必须用撇号括起来:

String selectQuery = "SELECT  * FROM " + TABLE_NAME 
    + " WHERE " + KEY_ONE + " = '" + String.valueOf(var1)
    + "' AND " + KEY_TWO + " = '" + String.valueOf(Var2) + "'";

如果你使用这个增强的语法会更好:

String selectQuery = "SELECT  * FROM " + TABLE_NAME 
    + " WHERE " + KEY_ONE + " = ? AND " + KEY_TWO + " = ?";

SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, new String[]{String.valueOf(var1), String.valueOf(var2)});