使用objectdatasource结合数据绑定控件进行简单三层架构的开发

对于B/S架构的三层架构的开发，可能很多的人都已经了解的是比较清楚的。哪么我在这里用的是最简单的三层架构。ui+bll+dal+dbsqlhelp+model.

从05出来以后由于功能明显比03夸张了很多，所以在开发的时候也就很方便。其中以数据的显示最为明显。通过sqldatasource可以几乎一行代码都不需要写，就能在GridView中显示出来数据，并且进行增删查改的操作，但是我个人总感觉这样做是有问题的。因为使用sqldatasource，就明显的破坏了3层架构的基本改变。哪么微软在05当中，很重点的推出了objectdatasource这个东西，就是专门用来结合三层架构开发的一个数据源绑定控件。 在层次之间传递的也是object，这样相对来说就比较好一些。

代码在具体的下边，其实主要就是DataList稍微麻烦一点，别的几个控件都可以自动 实现增删查改的功能，所以基本没什么写太多的代码。！

在这里主要是DataList的代码,以操作Jobs表为示例。

DbSqlHelp

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
namespace DbSqlHelp
{
    public abstract class DbSqlHelp
    {
        static string StrConn = @"User ID=sa;Password=perishryu;Initial Catalog=pubs;Data Source=OATHRYUSQL2005";
        static SqlDataAdapter da;
        static SqlCommand cmd;
        static SqlConnection conn;
        static DataSet ds;

        public static  DataSet Search(string sql)
        {
            using (da = new SqlDataAdapter(sql, StrConn))
            {
                using (ds = new DataSet())
                {
                    da.Fill(ds);
                    return ds;
                }
            }
        }
        public static bool Make(string sql)
        {
            using (conn = new SqlConnection(StrConn))
            {
                using (cmd = new SqlCommand(sql, conn))
                {
                    if (conn.State != ConnectionState.Closed)
                    {
                        conn.Close();
                    }
                    try
                    {
                        conn.Open();
                        cmd.ExecuteNonQuery();
                        return false;
                    }
                    catch(System.Exception ex)
                    {
                        throw ex;
                    }
                    finally
                    {
                        conn.Close();
                    }
                }
            }
        }
    }
}

 

Model

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

namespace Model
{
    public class Job_Model
    {
        public Job_Model()
        {
        }
        public Job_Model(int id, string desc, int min, int max)
        {
            this.job_desc = desc;
            this.job_id = id;
            this.min_lvl = min;
            this.max_lvl = max;
        }
        int job_id;

        public int Job_id
        {
            get { return job_id; }
            set { job_id = value; }
        }
        string job_desc;

        public string Job_desc
        {
            get { return job_desc; }
            set { job_desc = value; }
        }
        int min_lvl;

        public int Min_lvl
        {
            get { return min_lvl; }
            set { min_lvl = value; }
        }
        int max_lvl;

        public int Max_lvl
        {
            get { return max_lvl; }
            set { max_lvl = value; }
        }
    }
}

 

DAL

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
namespace DAL
{
    public class Job_DAL
    {
        string sql;
        public DataSet Select_Job_Dal(string jobid)
        {
            sql = "select * from jobs where job_id='" +jobid + "'";
            return DbSqlHelp.DbSqlHelp.Search(sql);

        }
        public DataSet Select_Job_Dal()
        {
            sql = "select * from jobs";
            return DbSqlHelp.DbSqlHelp.Search(sql);
        }

        public bool Update_Job_Dal(Model.Job_Model job)
        {
            sql = "update jobs set job_desc='" + job.Job_desc + "',min_lvl='" + job.Min_lvl + "',max_lvl='" + job.Max_lvl + "' where job_id='" + job.Job_id + "'";
            try
            {
                return DbSqlHelp.DbSqlHelp.Make(sql);
            }
            catch(System.Exception ex)
            {
                throw ex;
            }
        }
        public bool Insert_Job_Dal(Model.Job_Model job)
        {
            sql = "insert into jobs values('" + job.Job_desc + "','" + job.Min_lvl + "','" + job.Max_lvl + "')";
            try
            {
                return DbSqlHelp.DbSqlHelp.Make(sql);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            
        }
        public bool Delete_Job_Dal(Model.Job_Model job)
        {
            sql = "delete from jobs where job_id='" + job.Job_id + "'";
            try
            {
                return DbSqlHelp.DbSqlHelp.Make(sql);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
            
        }
    }
}

BLL

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
namespace BLL
{
    public class Job_BLL
    {
        DAL.Job_DAL jobdal;
        public DataSet Select_BLL()
        {
            jobdal = new DAL.Job_DAL();
            {
                return jobdal.Select_Job_Dal();
            }
        }
        public DataSet Select_BLL(string jobid)
        {
            jobdal = new DAL.Job_DAL();
            {
                return jobdal.Select_Job_Dal(jobid);
            }

        }
        public bool Update_BLL(Model.Job_Model job)
        {
            jobdal = new DAL.Job_DAL();
            try
            {
                return jobdal.Update_Job_Dal(job);
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
        }
        public bool Insert_BLL(Model.Job_Model job)
        {
            jobdal = new DAL.Job_DAL();
            try
            {
                return jobdal.Insert_Job_Dal(job);
            }
            catch(System.Exception ex)
            {
                throw ex;
            }
        }
        public bool Delete_BLL(Model.Job_Model job)
        {
            jobdal = new DAL.Job_DAL();
            try
            {
                return jobdal.Delete_Job_Dal(job);
            }
            catch(System.Exception ex)
            {
                throw ex;
            }
        }
    }
}

UI   aspx页面

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataListDemo.aspx.cs" Inherits="DataListDemo" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DataList ID="DataList1" runat="server" DataSourceID="ObjectDataSource1" RepeatColumns="4" RepeatDirection="Horizontal" Width="720px" DataKeyField="job_id" OnCancelCommand="DataList1_CancelCommand" OnEditCommand="DataList1_EditCommand" OnUpdateCommand="DataList1_UpdateCommand" OnDeleteCommand="DataList1_DeleteCommand">
            <ItemTemplate>
                job_id:<asp:Literal ID="Literal1" runat="server" Text='<%#Eval("job_id") %>'></asp:Literal><br />
                job_desc:<asp:Literal ID="Literal2" runat="server" Text='<%#Eval("job_desc") %>'></asp:Literal><br />
                min_lvl:<asp:Literal ID="Literal3" runat="server" Text='<%#Eval("min_lvl") %>'></asp:Literal><br />
                max_lvl:<asp:Literal ID="Literal4" runat="server" Text='<%#Eval("max_lvl") %>'></asp:Literal><br />
                <asp:LinkButton ID="LinkButton1" runat="server" CommandName="Edit">编辑</asp:LinkButton>&nbsp;&nbsp;&nbsp;&nbsp;
                <asp:LinkButton ID="LinkButton2" runat="server" CommandName="delete">删除</asp:LinkButton>
            </ItemTemplate>
            <EditItemTemplate>
                job_id:<asp:Literal ID="Literal1" runat="server" Text='<%#Eval("job_id") %>'></asp:Literal><br />
                job_desc:<asp:TextBox ID="TextBox1" runat="server" Text='<%#Bind("job_desc") %>'></asp:TextBox><br />
                min_lvl:<asp:TextBox ID="TextBox2" runat="server" Text='<%#Bind("min_lvl") %>'></asp:TextBox><br />
                max_lvl:<asp:TextBox ID="TextBox3" runat="server" Text='<%#Bind("max_lvl") %>'></asp:TextBox><br />
                <asp:LinkButton ID="LinkButton3" runat="server" CommandName="update">更新</asp:LinkButton>
                <asp:LinkButton ID="LinkButton4" runat="server" CommandName="cancel">取消</asp:LinkButton>
            </EditItemTemplate>
           
        </asp:DataList><asp:ObjectDataSource ID="ObjectDataSource1" runat="server" DataObjectTypeName="Model.Job_Model"
            DeleteMethod="Delete_BLL" InsertMethod="Insert_BLL" SelectMethod="Select_BLL"
            TypeName="BLL.Job_BLL" UpdateMethod="Update_BLL" OnUpdating="ObjectDataSource1_Updating" OnDeleting="ObjectDataSource1_Deleting" OnUpdated="ObjectDataSource1_Updated"></asp:ObjectDataSource>
        <asp:Label ID="Label1" runat="server" Text="Label" Width="280px"></asp:Label>
        &nbsp;&nbsp;
    </div>
    </form>
</body>
</html>

UI   CS代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.ComponentModel;

public partial class DataListDemo : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    }
    protected void DataList1_EditCommand(object source, DataListCommandEventArgs e)
    {
        this.DataList1.EditItemIndex = e.Item.ItemIndex;
        DataBind();
    }
    protected void DataList1_CancelCommand(object source, DataListCommandEventArgs e)
    {
        this.DataList1.EditItemIndex = -1;
        DataBind();
    }
    protected void ObjectDataSource1_Updating(object sender, ObjectDataSourceMethodEventArgs e)
    {
        ((Model.Job_Model)(e.InputParameters[0])).Job_id = job.Job_id;
        ((Model.Job_Model)(e.InputParameters[0])).Job_desc = job.Job_desc;
        ((Model.Job_Model)(e.InputParameters[0])).Min_lvl = job.Min_lvl;
        ((Model.Job_Model)(e.InputParameters[0])).Max_lvl = job.Max_lvl;
        this.DataList1.EditItemIndex = -1;
        DataBind();
    }
    Model.Job_Model job;
    protected void DataList1_UpdateCommand(object source, DataListCommandEventArgs e)
    {
        job = new Model.Job_Model();
        job.Job_id = Convert.ToInt32(((Literal)(this.DataList1.Items[e.Item.ItemIndex].FindControl("Literal1"))).Text);
        job.Job_desc = ((TextBox)(this.DataList1.Items[e.Item.ItemIndex].FindControl("TextBox1"))).Text;
        job.Min_lvl = Convert.ToInt32(((TextBox)(this.DataList1.Items[e.Item.ItemIndex].FindControl("TextBox2"))).Text);
        job.Max_lvl = Convert.ToInt32(((TextBox)(this.DataList1.Items[e.Item.ItemIndex].FindControl("TextBox3"))).Text);
        ObjectDataSource1.Update();

    }
    protected void DataList1_DeleteCommand(object source, DataListCommandEventArgs e)
    {
        job = new Model.Job_Model();
        job.Job_id = Convert.ToInt32(((Literal)(this.DataList1.Items[e.Item.ItemIndex].FindControl("Literal1"))).Text);
        ObjectDataSource1.Delete();


    }
    protected void ObjectDataSource1_Deleting(object sender, ObjectDataSourceMethodEventArgs e)
    {
        ((Model.Job_Model)(e.InputParameters[0])).Job_id = job.Job_id;
        DataBind();
    }
    protected void ObjectDataSource1_Updated(object sender, ObjectDataSourceStatusEventArgs e)
    {
        if (e.Exception != null)
        {
            e.ExceptionHandled = true;
            this.Label1.Text = e.Exception.Message;
        }
    }
}

其他的数据绑定控件（DetailsView，FormView，GridView），代码大同小异，他们都可以自动完成增删改查的功能，所以再这里就不写了。如果有朋友有更好的办法或者建议，可以留言交流一下。 可以留下EMAIL。