Question

您好我正在制作员工评估计划，我需要获得每个员工每个领域的平均值才能实现这一点，每次评估员工时，他们都会被插入一个新行，以免覆盖上一个人对该员工的评价我有我的代码，并没有抛出错误，但没有将平均值写入数据库

public void AvOut()
{
    try
    {
        string request = tbEmployee.Text;
        //Opens a connection to the database
        OleDbConnection conn = new OleDbConnection(ConnString);
        conn.Open();

        OleDbCommand cmd = conn.CreateCommand();
        cmd.CommandText = "SELECT [Admin].[OutPuts] FROM [Admin] WHERE EmployeeName ='" + request + "';";
        OleDbDataReader reader = cmd.ExecuteReader();

        int total = 0;
        int count = 0;

        while (reader.Read())
        {
            total += (int)reader["OutPuts"];
            count++;
        }

        int avg = total / count;

        OleDbCommand cmds = conn.CreateCommand();
        cmds.CommandText = "SELECT MAX(EmployeeID) AS [id_no] FROM [Admin];";
        OleDbDataReader dbReader = cmds.ExecuteReader();
        dbReader.Read();
        int id = Convert.ToInt32(dbReader["id_no"]);

        OleDbCommand tot = conn.CreateCommand();
        tot.CommandText = (@"UPDATE [Admin] SET AVGOutput ='" + avg + "' WHERE EmployeeID = " + id);
        int affected = tot.ExecuteNonQuery();

        conn.Close();
    }
    catch (Exception e)
    {
        MessageBox.Show("The exception is " + e.ToString());
    }
}

Answer 1

您可以尝试删除avg周围的单引号。所以你的查询应该是：

tot.CommandText = (@"UPDATE [Admin] SET AVGOutput =" + avg + " WHERE EmployeeID = " + id);

同时提出一个断点，看看你是否得到平均值的任何东西，并检查id

使用c＃获取ms access 2010中多行的平均值

1 个答案: