Question

我是Android新手，现在尝试使用cursor从SQLite检索数据。如何解决我的selectQuery？

  List<Info> info=new ArrayList<Info>();
        String selectQuery=("SELECT Weather, Date, Status, TimeIn_Info, TimeOut_Info FROM " + MyDatabaseHelper.TABLE_INFO + " WHERE Name = ?",new String{}(String.valueOf(name)));
        database = dbHelper.getWritableDatabase();
        Cursor cursor=database.rawQuery(selectQuery,null);

错误

Error:(77, 142) error: ')' expected
Error:(77, 143) error: <identifier> expected
Error:(77, 147) error: not a statement
Error:(77, 153) error: ';' expected
Error:(77, 177) error: ';' expected

Answer 1

错误是由您的String select查询引起的。你的中间有一个逗号，没有任何意义。连接运算符为+，而您没有,

此

 String selectQuery=("SELECT Weather, Date, Status, TimeIn_Info, TimeOut_Info FROM " + MyDatabaseHelper.TABLE_INFO + " WHERE Name = ?",new String{}(String.valueOf(name)))

应该是

  String selectQuery="SELECT Weather, Date, Status, TimeIn_Info, TimeOut_Info FROM " + MyDatabaseHelper.TABLE_INFO + " WHERE Name = ?";

然后你想要selectionArgs：

 String[] selectionArgs = new String[] {String.valueOf(name)};

然后是rawQuery：

database = dbHelper.getWritableDatabase();
Cursor cursor=database.rawQuery(selectQuery,selectionArgs);

错误：不是语句（查询）

1 个答案: