Question

executenonquery是我的问题，此代码适用于不同datagridview

中的其他按钮

这是我在删除按钮的代码

private void button4_Click_2(object sender, EventArgs e)
    {

        SqlConnection con = new SqlConnection(@"Data Source=XXYZZ\SQLEXPRESS;Initial Catalog=rick_inventiory;Integrated Security=True");
        SqlCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "Delete from tbl_Orders where CustomersID2 = '" + dataGridView5.SelectedRows[0].Cells[0].Value.ToString() + "'";
        con.Open();
        cmd.Parameters.AddWithValue("@CustomerID2", txtCustomerID2.Text);
        cmd.ExecuteNonQuery();
        con.Close();

        disp_data();

        MessageBox.Show("Deleted Successfully");


    }

更新代码仍然执行sa代码但没有更新它并且我的代码是更新按钮

SqlConnection con = new SqlConnection(@"Data Source=XXYZZ\SQLEXPRESS;Initial Catalog=rick_inventiory;Integrated Security=True");

        con.Open();
        SqlCommand cmd = con.CreateCommand();
        cmd.CommandType = CommandType.Text;
        cmd.CommandText = "Update  tbl_Products SET ProductName='" + txtProName.Text +
            "',Stocks='" + txtStocks.Text + "',Price='" + txtPrice.Text + "',Description='" +
            txtDesc.Text + "',CategoryName='" + txtCat.Text + "' where ProductID ='" + txtProID.Text + "';";
        cmd.ExecuteNonQuery();


        SqlDataAdapter da = new SqlDataAdapter("Select * from tbl_Products", con);
        DataTable dt = new DataTable();
        da.Fill(dt);

        dataGridView1.DataSource = dt;

        MessageBox.Show("Successfuly Updated");
        con.close();

Answer 1

在更新中，存在语法问题，删除更新查询的内侧半冒号

在删除时，您想要更改行

这

cmd.Parameters.AddWithValue（“@ CustomerID2”，txtCustomerID2.Text）;

到

cmd.Parameters.AddWithValue（“@ CustomerID2”，'“+ dataGridView5.SelectedRows [0] .Cells [0] .Value.ToString（）+”'）;

删除并更新选定的行

1 个答案: