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[英]How to delete/update datagridview checkbox from datagridview C#
[英]Update and Delete from DataGridView not functioning
我有一個顯示3行的DataGridView
,當我嘗試更新記錄時,它說成功更改了記錄。 但是當我檢查數據庫時,記錄沒有更新。
在刪除按鈕中,它說我必須選擇要刪除的記錄,但是我已經在DataGridView
選擇了一行
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.Sql;
using System.Data.SqlClient;
namespace RFG_Inventory_and_Management_System
{
public partial class AdminForm : Form
{
SqlCommand cmd;
SqlConnection con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Acer\Documents\Visual Studio 2010\Projects\RFG Inventory and Management System\RFG Inventory and Management System\Database1.mdf;Integrated Security=True;User Instance=True");
SqlCommandBuilder cmdbl;
SqlDataAdapter adap;
DataSet ds;
int ID = 0;
public AdminForm()
{
InitializeComponent();
PayratesDisplay();
NonMemberDisplay();
}
//Display Data in DataGridView
private void PayratesDisplay()
{
con.Open();
DataTable dt = new DataTable();
adap = new SqlDataAdapter("select * from tbl_payrates", con);
adap.Fill(dt);
dataGridView4.DataSource = dt;
con.Close();
}
private void NonMemberDisplay()
{
con.Open();
DataTable dt = new DataTable();
adap = new SqlDataAdapter("SELECT tbl_nonMember.*, tbl_customer.lname, tbl_customer.fname, tbl_customer.mname, tbl_customer.gender, tbl_customer.age, tbl_customer.membership_type FROM tbl_nonMember INNER JOIN tbl_customer ON tbl_nonMember.customerID = tbl_customer.customerID", con);
adap.Fill(dt);
dataGridView2.DataSource = dt;
con.Close();
}
//Clear Data
private void ClearData()
{
tbMemship.Text = "";
tbPerses.Text = "";
tbDisc.Text = "";
ID = 0;
}
private void AdminForm_Load(object sender, EventArgs e)
{
// TODO: This line of code loads data into the 'database1DataSet.tbl_customer' table. You can move, or remove it, as needed.
this.tbl_customerTableAdapter.Fill(this.database1DataSet.tbl_customer);
// TODO: This line of code loads data into the 'database1DataSet.tbl_nonMember' table. You can move, or remove it, as needed.
this.tbl_nonMemberTableAdapter.Fill(this.database1DataSet.tbl_nonMember);
}
private void fillByToolStripButton_Click(object sender, EventArgs e)
{
try
{
this.tbl_customerTableAdapter.FillBy(this.database1DataSet.tbl_customer);
}
catch (System.Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
}
}
//----------------------------------BUTTONS FOR PAY RATE-------------------------------------------------------------//
//dataGridView1 RowHeaderMouseClick Event
private void dataGridView4_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
tbMemship.Text = dataGridView4.Rows[e.RowIndex].Cells[0].Value.ToString();
tbPerses.Text = dataGridView4.Rows[e.RowIndex].Cells[1].Value.ToString();
tbDisc.Text = dataGridView4.Rows[e.RowIndex].Cells[2].Value.ToString();
}
private void btn_update_Click(object sender, EventArgs e)
{
if (tbMemship.Text != "" && tbPerses.Text != "" && tbDisc.Text != "")
{
cmd = new SqlCommand("update tbl_payrates set Membership=@Membership,PerSession=@PerSession where Discounted=@Discounted", con);
con.Open();
cmd.Parameters.AddWithValue("@Membership", tbMemship.Text);
cmd.Parameters.AddWithValue("@PerSession", tbPerses.Text);
cmd.Parameters.AddWithValue("@Discounted", tbDisc.Text);
cmd.ExecuteNonQuery();
MessageBox.Show("Record Updated Successfully");
con.Close();
PayratesDisplay();
ClearData();
}
else
{
MessageBox.Show("Please Select Record to Update");
}
}
private void btn_PRadd_Click(object sender, EventArgs e)
{
DialogResult dr = MessageBox.Show("Are you sure to save Changes", "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if (dr == DialogResult.Yes)
{
con = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename=C:\Users\Acer\Documents\Visual Studio 2010\Projects\RFG Inventory and Management System\RFG Inventory and Management System\Database1.mdf;Integrated Security=True;User Instance=True");
con.Open();
cmd = new SqlCommand("INSERT INTO tbl_payrates (Membership, PerSession, Discounted) VALUES (@Membership, @PerSession, @Discounted)", con);
cmd.Parameters.AddWithValue("@Membership", tbMemship.Text);
cmd.Parameters.AddWithValue("@PerSession", tbPerses.Text);
cmd.Parameters.AddWithValue("@Discounted", tbDisc.Text);
cmd.ExecuteNonQuery();
}
}
private void btn_PRdel_Click_1(object sender, EventArgs e)
{
//Update button update dataset after insertion,upadtion or deletion
DialogResult dr = MessageBox.Show("Are you sure to save Changes", "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if (dr == DialogResult.Yes)
{
if (ID != 0)
{
cmd = new SqlCommand("DELETE FROM tbl_payrates WHERE ID=@id", con);
con.Open();
cmd.Parameters.AddWithValue("@id", ID);
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Record Deleted Successfully!");
PayratesDisplay();
ClearData();
}
else
{
MessageBox.Show("Please Select Record to Delete");
}
}
}
}
}
整個AttachDbFileName =方法有缺陷-充其量! 在Visual Studio中運行應用程序時,它將在.mdf
文件周圍復制(從App_Data
目錄復制到輸出目錄-通常是.\\bin\\debug
應用程序運行所在的位置),並且很可能 INSERT
可以正常工作-但最后您只是看錯了.mdf文件 !
如果您要堅持這種方法,請嘗試在myConnection.Close()
調用上放置一個斷點,然后使用SQL Server Mgmt Studio Express檢查.mdf
文件-我幾乎可以確定您的數據在那里。
我認為真正的解決方案是
安裝SQL Server Express(並且您已經完成了此操作)
安裝SQL Server Management Studio Express
在SSMS Express中創建數據庫,並為其指定一個邏輯名稱(例如InventoryDb
)
使用其邏輯數據庫名稱 (在服務器上創建時提供)連接到該數據庫 -並且不要弄亂物理數據庫文件和用戶實例。 在這種情況下,您的連接字符串將類似於:
Data Source=.\\\\SQLEXPRESS;Database=InventoryDb;Integrated Security=True
和其他一切是完全一樣的前...
另請參閱亞倫·貝特朗(Aaron Bertrand)出色的博客文章不良習慣:使用AttachDbFileName獲取更多背景信息。
我認為您沒有將值賦給id .so id始終為0,因此您無法刪除記錄。 嘗試將值分配給ID並刪除。我希望它可以正常工作。
private void btn_PRdel_Click_1(object sender, EventArgs e)
{
//Update button update dataset after insertion,upadtion or deletion
DialogResult dr = MessageBox.Show("Are you sure to save Changes", "Message", MessageBoxButtons.YesNo, MessageBoxIcon.Information);
if (dr == DialogResult.Yes)
{
if (ID != 0)// where is the id value?
{
cmd = new SqlCommand("DELETE FROM tbl_payrates WHERE ID=@id", con);
con.Open();
cmd.Parameters.AddWithValue("@id", ID);
cmd.ExecuteNonQuery();
con.Close();
MessageBox.Show("Record Deleted Successfully!");
PayratesDisplay();
ClearData();
}
else
{
MessageBox.Show("Please Select Record to Delete");
}
}
}
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