三层架构的开发
2008-10-06 23:27
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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。这里用的是最简单的三层架构：ui+bll+dal+dbsqlhelp+model 。
从VS05出来以后由于功能明显比VS03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VS05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>
<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>
</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。需要完整代码的朋友，可以留下EMAIL。
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