Question

    //check if user has completed all five tasks
        OleDbConnection dbCon = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\zoofari\zoofari\zoofari\MainData.accdb");

        OleDbDataAdapter dAdapter = new OleDbDataAdapter();

        DataSet ds = new DataSet();

        string query = ("select * from tbl_Tasks where Username = '" + _stuUname + "'");

        dbCon.Open();
        dAdapter = new OleDbDataAdapter(query, dbCon);

        OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(dAdapter);
        DataTable dTable = new DataTable();
        dAdapter.Fill(dTable);

        dbCon.Close();

我正在尝试检查用户是否已完成5个任务（布尔值为true），然后将真值写入同一个表中名为“Completed”的另一个字段。我是否需要创建变量来保存前五个值，还是可以在一个SQL语句中检查它？我的SQL技能非常基础，所以请尽可能简单地回复！感谢

Answer 1

您根本不需要存储任何值。您只需运行查询

即可

UPDATE [tbl_Tasks] SET [Completed] = ([1] AND [2] AND [3] AND [4] AND [5])

从数据库表中读取bool值并将一个bool值写回它

1 个答案: