“步步精心”——三层架构下GridView控件实现增删改查

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DiaryModels
{
/// <summary>
/// 用户类
/// </summary>
public class Users
{
private int _UserID;
private string _UserName;
private string _password;
/// <summary>
/// 用户ID
/// </summary>
public int UserID {
get { return _UserID; }
set { _UserID = value; }
}
/// <summary>
/// 用户名
/// </summary>
public string UserName {
get { return _UserName; }
set { _UserName = value; }
}
/// <summary>
/// 密码
/// </summary>
public string password {
get { return _password; }
set { _password = value; }
}
}
}

DiaryDAL层的UserDAO

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Configuration;
using DiaryModels;
using System.Data;
using System.Data.SqlClient;

namespace DiaryDAL
{
public class UserDAO
{
Helper help = new Helper();
/// <summary>
/// 添加一条用户信息
/// </summary>
/// <param name="user"></param>
/// <returns></returns>
public bool Add(Users user) {
string cmdText = "insert into Users(UserID,UserName,password) values(@UserID,@UserName,@password)";
SqlParameter[] param = new SqlParameter[3];
param[0]=new SqlParameter("@UserID",user.UserID);
param[1] = new SqlParameter("@UserName", user.UserName);
param[2] = new SqlParameter("@password", user.password);
return help.ExecMake(cmdText, CommandType.Text, param);
}
/// <summary>
/// 删除一条用户信息
/// </summary>
/// <param name="user"></param>
/// <returns></returns>
public bool Delete(Users user) {
string cmdText = "delete from Users where UserID=@UserID";
SqlParameter[] param = new SqlParameter[1];
param[0] = new SqlParameter("@UserID", user.UserID);
return help.ExecMake(cmdText, CommandType.Text, param);
}
/// <summary>
/// 修改一条用户信息
/// </summary>
/// <param name="user"></param>
/// <returns></returns>
public bool Modify(Users user) {
string cmdText = "update Users set UserName =@UserName,password =@password where UserID =@UserID";
SqlParameter[] param = new SqlParameter[3];
param[0] = new SqlParameter("@UserName", user.UserName);
param[1] = new SqlParameter("@password", user.password);
param[2] = new SqlParameter("@UserID", user.UserID);
return help.ExecMake(cmdText, CommandType.Text, param);
}
public DataTable Select() {
string cmdText = "select * from Users";
return help.ExecSelect(cmdText, CommandType.Text);
}
}
}

DiaryDAL层的Helper类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace DiaryDAL
{
public class Helper
{
/// <summary>
/// 执行带参数的增删改语句
/// </summary>
/// <param name="cmdText"></param>
/// <param name="Paras"></param>
/// <returns></returns>
public bool ExecMake(string cmdText, CommandType Cmdtype, SqlParameter[] Paras)
{

SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["conStr"]);
con.Open();
//对SqlCommand对象进行初始化
SqlCommand SqlComm = new SqlCommand(cmdText, con);
SqlComm.CommandType = Cmdtype;
//对参数赋值
SqlComm.Parameters.AddRange(Paras);
//执行命令
SqlComm.ExecuteNonQuery();
con.Close();
return true;

}

/// <summary>
/// 执行不带参数的查询语句
/// </summary>
/// <param name="cmdText"></param>
/// <param name="Paras"></param>
/// <returns></returns>
public DataTable ExecSelect(string cmdText, CommandType Cmdtype)
{
SqlConnection con = new SqlConnection(ConfigurationManager.AppSettings["conStr"]);
con.Open();

//对SqlCommand对象进行实例化
SqlCommand SqlComm = new SqlCommand(cmdText, con);
SqlComm.CommandType = Cmdtype;
//给参数赋值
SqlComm.CommandTimeout = 10000;

//返回DataReader对象
SqlDataReader DataReader = SqlComm.ExecuteReader();
DataTable Dt = new DataTable();
//返回DataTable对象
Dt.Load(DataReader);

//返回数据表
con.Close();
return Dt;
}

}
}

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

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using DiaryModels;
using DiaryDAL;

namespace DiaryBLL
{
public class UserManager
{
UserDAO userdao = new UserDAO();
public bool Add(Users user) {
return userdao.Add(user);
}
public bool Delete(Users user) {
return userdao.Delete(user);
}
public bool Modify(Users user) {
return userdao.Modify(user);
}
public DataTable Select() {
return userdao.Select();
}
}
}

表示层：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using DiaryModels;
using DiaryBLL;

public partial class _Default : System.Web.UI.Page
{
UserManager usermgr = new UserManager();
Users user = new Users();

//为表格绑定数据源
private void Bind() {
GridView1.DataSource = usermgr.Select();
GridView1.DataBind();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) {
Bind();
}
}

//添加用户信息
protected void btnOk_Click(object sender, EventArgs e)
{
user.UserID = Convert.ToInt16( txtUserID.Text);
user.UserName = txtUserName.Text;
user.password = txtPassword.Text;
if (usermgr.Add(user))
{
Response.Write("<script>('添加成功！')</script>");
Bind();
}
else {
Response.Write("<script>('添加失败！')</script>");
}

}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
user.UserID = Convert.ToInt16(((GridView1.Rows[e.RowIndex].FindControl("Label1") as Label).Text));
if (usermgr.Delete(user))
{
Response.Write("<script>('删除成功！')</script>");
Bind();
}
else {
Response.Write("<script>('删除失败！')</script>");
}
}
//让当前行处于修改状态
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
GridView1.EditIndex = e.NewEditIndex;
Bind();
}
//取消编辑
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
Bind();
}
//更新至数据库
protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
user.UserID = Convert.ToInt16((GridView1.Rows[e.RowIndex].FindControl("Label1")as Label).Text);
user.UserName = (GridView1.Rows[e.RowIndex].FindControl("TextBox2") as TextBox).Text;
user.password = (GridView1.Rows[e.RowIndex].FindControl("TextBox3") as TextBox).Text;

if (usermgr.Modify(user))
{
Response.Write("<script>('修改成功！')</script>");
GridView1.EditIndex = -1;
Bind();
}
else {
Response.Write("<script>('修改失败！')</script>");
}
}
}