三层架构下GridView控件实现增删改查

三层架构下GridView控件实现增删改查

转自：https://blog.csdn.net/iteye_3224/article/details/82373073

第一步：建立三层，并添加他们之间的引用关系，如下图所示：

 

第二步：添加GridView表格，并且套用格式样式，如下图所示：

 

第三步：点击表格右侧的小三角，并选中编辑列，如下图所示：

 

第四步：添加三个绑定列，并为其绑定上数据，如下图所示：

 

 

并且修改命令列的名称为“管理”，做好之后如下图所示：

 

下面是源代码的整体架构

接下来是所有的源代码：

DiaryModels层的Users

 

1.  
   using System;
2.  
   using System.Collections.Generic;
3.  
   using System.Linq;
4.  
   using System.Text;
5.  
    
6.  
   namespace DiaryModels
7.  
   {
8.  
   /// <summary>
9.  
   /// 用户类
10.  
    /// </summary>
11.  
    public class Users
12.  
    {
13.  
    private int _UserID;
14.  
    private string _UserName;
15.  
    private string _password;
16.  
    /// <summary>
17.  
    /// 用户ID
18.  
    /// </summary>
19.  
    public int UserID {
20.  
    get { return _UserID; }
21.  
    set { _UserID = value; }
22.  
    }
23.  
    /// <summary>
24.  
    /// 用户名
25.  
    /// </summary>
26.  
    public string UserName {
27.  
    get { return _UserName; }
28.  
    set { _UserName = value; }
29.  
    }
30.  
    /// <summary>
31.  
    /// 密码
32.  
    /// </summary>
33.  
    public string password {
34.  
    get { return _password; }
35.  
    set { _password = value; }
36.  
    }
37.  
    }
38.  
    }

DiaryDAL层的UserDAO

 

1.  
   using System;
2.  
   using System.Collections.Generic;
3.  
   using System.Linq;
4.  
   using System.Text;
5.  
   using System.Configuration;
6.  
   using DiaryModels;
7.  
   using System.Data;
8.  
   using System.Data.SqlClient;
9.  
    
10.  
    namespace DiaryDAL
11.  
    {
12.  
    public class UserDAO
13.  
    {
14.  
    Helper help = new Helper();
15.  
    /// <summary>
16.  
    /// 添加一条用户信息
17.  
    /// </summary>
18.  
    /// <param name="user"></param>
19.  
    /// <returns></returns>
20.  
    public bool Add(Users user) {
21.  
    string cmdText = "insert into Users(UserID,UserName,password) values(@UserID,@UserName,@password)";
22.  
    SqlParameter[] param = new SqlParameter[3];
23.  
    param[0]=new SqlParameter("@UserID",user.UserID);
24.  
    param[1] = new SqlParameter("@UserName", user.UserName);
25.  
    param[2] = new SqlParameter("@password", user.password);
26.  
    return help.ExecMake(cmdText, CommandType.Text, param);
27.  
    }
28.  
    /// <summary>
29.  
    /// 删除一条用户信息
30.  
    /// </summary>
31.  
    /// <param name="user"></param>
32.  
    /// <returns></returns>
33.  
    public bool Delete(Users user) {
34.  
    string cmdText = "delete from Users where UserID=@UserID";
35.  
    SqlParameter[] param = new SqlParameter[1];
36.  
    param[0] = new SqlParameter("@UserID", user.UserID);
37.  
    return help.ExecMake(cmdText, CommandType.Text, param);
38.  
    }
39.  
    /// <summary>
40.  
    /// 修改一条用户信息
41.  
    /// </summary>
42.  
    /// <param name="user"></param>
43.  
    /// <returns></returns>
44.  
    public bool Modify(Users user) {
45.  
    string cmdText = "update Users set UserName =@UserName,password =@password where UserID =@UserID";
46.  
    SqlParameter[] param = new SqlParameter[3];
47.  
    param[0] = new SqlParameter("@UserName", user.UserName);
48.  
    param[1] = new SqlParameter("@password", user.password);
49.  
    param[2] = new SqlParameter("@UserID", user.UserID);
50.  
    return help.ExecMake(cmdText, CommandType.Text, param);
51.  
    }
52.  
    public DataTable Select() {
53.  
    string cmdText = "select * from Users";
54.  
    return help.ExecSelect(cmdText, CommandType.Text);
55.  
    }
56.  
    }
57.  
    }

DiaryDAL层的Helper类

 

1.  
   using System;
2.  
   using System.Collections.Generic;
3.  
   using System.Linq;
4.  
   using System.Text;
5.  
   using System.Data;
6.  
   using System.Data.SqlClient;
7.  
   using System.Configuration;
8.  
    
9.  
   namespace DiaryDAL
10.  
    {
11.  
    public class Helper
12.  
    {
13.  
    /// <summary>
14.  
    /// 执行带参数的增删改语句
15.  
    /// </summary>
16.  
    /// <param name="cmdText"></param>
17.  
    /// <param name="Paras"></param>
18.  
    /// <returns></returns>
19.  
    public bool ExecMake(string cmdText, CommandType Cmdtype, SqlParameter[] Paras)
20.  
    {
21.  
     
22.  
    SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["conStr"]);
23.  
    con.Open();
24.  
    //对SqlCommand对象进行初始化
25.  
    SqlCommand SqlComm = new SqlCommand(cmdText, con);
26.  
    SqlComm.CommandType = Cmdtype;
27.  
    //对参数赋值
28.  
    SqlComm.Parameters.AddRange(Paras);
29.  
    //执行命令
30.  
    SqlComm.ExecuteNonQuery();
31.  
    con.Close();
32.  
    return true;
33.  
     
34.  
    }
35.  
     
36.  
    /// <summary>
37.  
    /// 执行不带参数的查询语句
38.  
    /// </summary>
39.  
    /// <param name="cmdText"></param>
40.  
    /// <param name="Paras"></param>
41.  
    /// <returns></returns>
42.  
    public DataTable ExecSelect(string cmdText, CommandType Cmdtype)
43.  
    {
44.  
    SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["conStr"]);
45.  
    con.Open();
46.  
     
47.  
    //对SqlCommand对象进行实例化
48.  
    SqlCommand SqlComm = new SqlCommand(cmdText, con);
49.  
    SqlComm.CommandType = Cmdtype;
50.  
    //给参数赋值
51.  
    SqlComm.CommandTimeout = 10000;
52.  
     
53.  
    //返回DataReader对象
54.  
    SqlDataReader DataReader = SqlComm.ExecuteReader();
55.  
    DataTable Dt = new DataTable();
56.  
    //返回DataTable对象
57.  
    Dt.Load(DataReader);
58.  
     
59.  
    //返回数据表
60.  
    con.Close();
61.  
    return Dt;
62.  
    }
63.  
     
64.  
    }
65.  
    }

业务逻辑层DiaryBLL的UserManager没有进行判断，读者明白意思即可

 

1.  
   using System;
2.  
   using System.Collections.Generic;
3.  
   using System.Linq;
4.  
   using System.Text;
5.  
   using System.Data;
6.  
   using DiaryModels;
7.  
   using DiaryDAL;
8.  
    
9.  
   namespace DiaryBLL
10.  
    {
11.  
    public class UserManager
12.  
    {
13.  
    UserDAO userdao = new UserDAO();
14.  
    public bool Add(Users user) {
15.  
    return userdao.Add(user);
16.  
    }
17.  
    public bool Delete(Users user) {
18.  
    return userdao.Delete(user);
19.  
    }
20.  
    public bool Modify(Users user) {
21.  
    return userdao.Modify(user);
22.  
    }
23.  
    public DataTable Select() {
24.  
    return userdao.Select();
25.  
    }
26.  
    }
27.  
    }

表示层：

1.  
   using System;
2.  
   using System.Collections.Generic;
3.  
   using System.Linq;
4.  
   using System.Web;
5.  
   using System.Web.UI;
6.  
   using System.Web.UI.WebControls;
7.  
   using DiaryModels;
8.  
   using DiaryBLL;
9.  
    
10.  
    public partial class _Default : System.Web.UI.Page
11.  
    {
12.  
    UserManager usermgr = new UserManager();
13.  
    Users user = new Users();
14.  
     
15.  
    //为表格绑定数据源
16.  
    private void Bind() {
17.  
    GridView1.DataSource = usermgr.Select();
18.  
    GridView1.DataBind();
19.  
    }
20.  
    protected void Page_Load(object sender, EventArgs e)
21.  
    {
22.  
    if (!IsPostBack) {
23.  
    Bind();
24.  
    }
25.  
    }
26.  
     
27.  
    //添加用户信息
28.  
    protected void btnOk_Click(object sender, EventArgs e)
29.  
    {
30.  
    user.UserID = Convert.ToInt16( txtUserID.Text);
31.  
    user.UserName = txtUserName.Text;
32.  
    user.password = txtPassword.Text;
33.  
    if (usermgr.Add(user))
34.  
    {
35.  
    Response.Write("<script>('添加成功！')</script>");
36.  
    Bind();
37.  
    }
38.  
    else {
39.  
    Response.Write("<script>('添加失败！')</script>");
40.  
    }
41.  
     
42.  
    }
43.  
    protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
44.  
    {
45.  
    user.UserID = Convert.ToInt16(((GridView1.Rows[e.RowIndex].FindControl("Label1") as Label).Text));
46.  
    if (usermgr.Delete(user))
47.  
    {
48.  
    Response.Write("<script>('删除成功！')</script>");
49.  
    Bind();
50.  
    }
51.  
    else {
52.  
    Response.Write("<script>('删除失败！')</script>");
53.  
    }
54.  
    }
55.  
    //让当前行处于修改状态
56.  
    protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
57.  
    {
58.  
    GridView1.EditIndex = e.NewEditIndex;
59.  
    Bind();
60.  
    }
61.  
    //取消编辑
62.  
    protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
63.  
    {
64.  
    GridView1.EditIndex = -1;
65.  
    Bind();
66.  
    }
67.  
    //更新至数据库
68.  
    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
69.  
    {
70.  
    user.UserID = Convert.ToInt16((GridView1.Rows[e.RowIndex].FindControl("Label1")as Label).Text);
71.  
    user.UserName = (GridView1.Rows[e.RowIndex].FindControl("TextBox2") as TextBox).Text;
72.  
    user.password = (GridView1.Rows[e.RowIndex].FindControl("TextBox3") as TextBox).Text;
73.  
     
74.  
    if (usermgr.Modify(user))
75.  
    {
76.  
    Response.Write("<script>('修改成功！')</script>");
77.  
    GridView1.EditIndex = -1;
78.  
    Bind();
79.  
    }
80.  
    else {
81.  
    Response.Write("<script>('修改失败！')</script>");
82.  
    }
83.  
    }
84.  
    }