Question

我正在尝试使用下面的代码显示来自四个不同数据库表的数据，这种方法适用于一个表，但我不能让我的头脑使它适用于多个，这里是代码：

private void Assign_Load(object sender, EventArgs e)
    {
        try
        {
            OleDbConnection conn = new OleDbConnection();
            conn.ConnectionString = ConnectionDetail.Warehouse;
            string sql = "Select * from [Location], [Assign], [Products], [staff]";
            da = new OleDbDataAdapter(sql, conn);
            da.Fill(dt); // filling the database information into databtable

            //Location Table
            DataRow dr = dt.Rows[currentRow]; // counting the rows
            txtLocID.Text = dr["Location ID"].ToString();
            txtAisle.Text = dr["Aisle Code"].ToString(); 
            txtSection.Text = dr["Section"].ToString();
            txtShelf.Text = dr["Shelf"].ToString();
            txtLocation.Text = dr["Location"].ToString();
            txtLength.Text = dr["Length"].ToString();
            txtWidth.Text = dr["Width"].ToString();
            lstSize.Text = dr["Size Description"].ToString();

            //Product Table
            txtSKU.Text = dr["SKU"].ToString();
            txtDes.Text = dr["Description"].ToString(); 
            listHaz.Text = dr["Hazardous"].ToString();
            listLiq.Text = dr["Liquid"].ToString();
            txtQuan.Text = dr["Quantity"].ToString();
            txtWeig.Text = dr["Weight"].ToString();
            lstSize.Text = dr["Size Description"].ToString();

            //Satff Table
            txtID.Text = dr["StaffID"].ToString();

            //Assign Table
            txtAssID.Text = dr["Assign ID"].ToString();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        {
            OleDbConnection load = new OleDbConnection();
            load.ConnectionString = ConnectionDetail.Warehouse;
            OleDbCommand cmds = new OleDbCommand();
            lbltime.Text = DateTime.Now.ToString("yyyy MMM ddd HH:mm");
            try
            {
                load.Open();
                cmds = new OleDbCommand();
                cmds.CommandText = "SELECT * FROM [Location], [Assign], [Products], [staff];";
                cmds.Connection = load;
                dr = cmds.ExecuteReader();   


            }
            catch (Exception err)
            {
                //Any database errors jump here and output error message
                MessageBox.Show("A database error has occurred: " + Environment.NewLine + err.Message);
            }
            finally
            {
               // btnNext_Click(sender, e);
                txtLocID.Visible = false;
            }
        }
    }

Answer 1

最好的答案是更新SQL语句以使用JOIN语句。假设您的数据/表格以某种方式相关。

另外，另一种方法是创建单独的函数来分别填充每组文本项。

看看你的代码，我打赌你应该考虑＆＃34;绑定＆＃34;。

Answer 2

想出来，这就像你的所有建议一样，感谢大家的帮助。

    OleDbConnection Cons = new OleDbConnection(); // new connection 
    OleDbDataReader dr;
    int currentRow = 0;

    //Location
    DataTable dt = new DataTable();
    OleDbDataAdapter da;

    //Product
    DataTable dt1 = new DataTable();
    OleDbDataAdapter da1;

    //staff
    DataTable dt2 = new DataTable();
    OleDbDataAdapter da2;

    //Assign
    DataTable dt3 = new DataTable();
    OleDbDataAdapter da3;

    private void Assign_Load(object sender, EventArgs e)
    {
        try
        {
            OleDbConnection conn = new OleDbConnection();
            conn.ConnectionString = ConnectionDetail.Warehouse;
            string sql = "Select * from Location";
            da = new OleDbDataAdapter(sql, conn);
            da.Fill(dt); // filling the database information into databtable

            //Location Table
            DataRow dr = dt.Rows[currentRow]; // counting the rows
            txtLocID.Text = dr["Location ID"].ToString();
            txtAisle.Text = dr["Aisle Code"].ToString(); 
            txtSection.Text = dr["Section"].ToString();
            txtShelf.Text = dr["Shelf"].ToString();
            txtLocation.Text = dr["Location"].ToString();
            txtLength.Text = dr["Length"].ToString();
            txtWidth.Text = dr["Width"].ToString();
            lstSize.Text = dr["Size Description"].ToString();

            //Product Table
            OleDbConnection conn1 = new OleDbConnection();
            conn1.ConnectionString = ConnectionDetail.Warehouse;
            string sql1 = "Select * from Products";
            da1 = new OleDbDataAdapter(sql1, conn1);
            da1.Fill(dt1); // filling the database information into databtable

            DataRow dr1 = dt1.Rows[currentRow]; // counting the rows
            txtSKU.Text = dr1["SKU"].ToString();
            txtDes.Text = dr1["Description"].ToString(); 
            listHaz.Text = dr1["Hazardous"].ToString();
            listLiq.Text = dr1["Liquid"].ToString();
            txtQuan.Text = dr1["Quantity"].ToString();
            txtWeig.Text = dr1["Weight"].ToString();
            lstSize1.Text = dr1["Size Description"].ToString();

            //Staff Table
            OleDbConnection conn2 = new OleDbConnection();
            conn2.ConnectionString = ConnectionDetail.Warehouse;
            string sql2 = "Select * from Staff";
            da2 = new OleDbDataAdapter(sql2, conn2);
            da2.Fill(dt2); // filling the database information into databtable

            DataRow dr2 = dt2.Rows[currentRow]; // counting the rows
            txtID.Text = dr2["StaffID"].ToString();

            //Assign Table
            OleDbConnection conn3 = new OleDbConnection();
            conn3.ConnectionString = ConnectionDetail.Warehouse;
            string sql3 = "Select * from Assign";
            da3 = new OleDbDataAdapter(sql3, conn3);
            da3.Fill(dt3); // filling the database information into databtable

            DataRow dr3 = dt3.Rows[currentRow]; // counting the rows
            txtAssID.Text = dr3["Assign ID"].ToString();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        {
            OleDbConnection load = new OleDbConnection();
            load.ConnectionString = ConnectionDetail.Warehouse;
            OleDbCommand cmds = new OleDbCommand();
            lbltime.Text = DateTime.Now.ToString("yyyy MMM ddd HH:mm");
            try
            {
                load.Open();
                cmds = new OleDbCommand();
                cmds.CommandText = "SELECT * FROM Location;";
                cmds.CommandText = "SELECT * FROM Products;";
                cmds.CommandText = "SELECT * FROM Staff;";
                cmds.CommandText = "SELECT * FROM Assign;";
                cmds.Connection = load;
                dr = cmds.ExecuteReader();   


            }
            catch (Exception err)
            {
                //Any database errors jump here and output error message
                MessageBox.Show("A database error has occurred: " + Environment.NewLine + err.Message);
            }
            finally
            {
               // btnNext_Click(sender, e);
                txtLocID.Visible = false;
            }
        }
    }

如何将多个访问表中的数据转换为C＃窗体？

2 个答案: