Question

我一直在寻找它，但我无法找到我需要的东西。我在android中有一个SQLite表，我想知道rawquery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，以及那些两个列的值为1的WHERE的所有列。例如。

我怎么能这样做？

我试过了：

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..

感谢您的帮助：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) + "'";

如果使用此增强语法，则会更好：

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)});

Answer 2

请尝试以下操作并删除第二个WHERE子句

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

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

Android SQLite不止一个WHERE

2 个答案: