一般我们都采用分层架构，
先思考业务，要解决什么样的业务问题，再去思考技术实现。
l 正向思维：
界面(UI)—>业务逻辑（BLL）—>数据逻辑（DAL）—>数据实体（Model）—>数据存储（Db）
l 反向思维：
数据存储（Db）—>数据实体（Model）—>数据逻辑（DAL）—>业务逻辑（BLL）—>界面(UI)。
从数据库推导到界面，从界面推导到数据库。搞清楚类之间的关系。数据之间传递关系。
界面(UI):由控件组成。系统与用户交互的窗口。
业务逻辑（BLL）：封装业务处理功能。对象的组合，应用。
数据逻辑（DAL）：对数据的操作（算法）。（增删改查的多样性），对象函数，方法。
数据实体（Model）：操作的数据结构。对象属性
数据存储（Db）：数据的存储持久化。（表）。
体会：程序=数据结构+算法，程序=类对象+类对象之间的关系。
我们的很多项目都是基于微软企业库5.0搭建的。具体说一下我们在企业级项目中是怎么应用的。下面是架构图：
1.基于微软企业库的工具类
封装了微软企业库访问数据库常用的最基本的操作。
2.Model层（数据库表映射）
封装了很多属性。对应数据库表c_hbbb_code
代码：
using System;
namespace SFS.Entity.Model
{
/// summary
/// c_hbbb_code
/// summary
[Serializable]
public class c_hbbb_code
{
public c_hbbb_code()
{ }
private int _CodeID = 0;
/// <summary>
///
/// </summary>
public int CodeID
{
get { return _CodeID; }
set { _CodeID = value; }
}
private string _CODENO = "";
/// <summary>
///
/// </summary>
public string CODENO
{
get { return _CODENO; }
set { _CODENO = value; }
}
private string _CODENAME = "";
/// <summary>
///
/// </summary>
public string CODENAME
{
get { return _CODENAME; }
set { _CODENAME = value; }
}
private string _ISMX = "";
/// <summary>
///
/// </summary>
public string ISMX
{
get { return _ISMX; }
set { _ISMX = value; }
}
private string _ParentCodeNO = "";
/// <summary>
///
/// </summary>
public string ParentCodeNO
{
get { return _ParentCodeNO; }
set { _ParentCodeNO = value; }
}
private string _ZT = "";
/// <summary>
///
/// </summary>
public string ZT
{
get { return _ZT; }
set { _ZT = value; }
}
}
}3.Dal层（封装数据库操作增，删，改，查）
namespace SFS.DAL
{
public class c_hbbb_code
{
private SFS.Utility.DbUtility.DbHelper db = null;
/// <summary>
/// 是否存在该记录
/// </summary>
public bool Exists(string CodeID)
{
string strSql = "SELECT count(1) FROM c_hbbb_code WHERE CodeID=@CodeID ";
DbCommand dbCommand = db.GetSqlStringCommand(strSql);
db.AddInParameter(dbCommand, "CodeID", DbType.String, CodeID);
int result;
object obj = db.ExecuteScalar(dbCommand);
int.TryParse(obj.ToString(), out result);
if (result == 1)
{
return true;
}
else
{
return false;
}
}
/// <summary>
/// 增加一条数据
/// </summary>
public int Add(SFS.Entity.Model.c_hbbb_code model)
{
return Add(model, null);
}
/// <summary>
/// 增加一条数据
/// </summary>
public int Add(SFS.Entity.Model.c_hbbb_code model, DbTransaction transaction)
{
try
{
string strSql = "INSERT INTO c_hbbb_code(CodeID,CODENO,CODENAME,ISMX,ParentCodeNO,ZT)VALUES(@CodeID,@CODENO,@CODENAME,@ISMX,@ParentCodeNO,@ZT)";
DbCommand dbCommand = db.GetSqlStringCommand(strSql);
db.AddInParameter(dbCommand, "CodeID", DbType.Int32, model.CodeID);
db.AddInParameter(dbCommand, "CODENO", DbType.String, model.CODENO);
db.AddInParameter(dbCommand, "CODENAME", DbType.String, model.CODENAME);
db.AddInParameter(dbCommand, "ISMX", DbType.String, model.ISMX);
db.AddInParameter(dbCommand, "ParentCodeNO", DbType.String, model.ParentCodeNO);
db.AddInParameter(dbCommand, "ZT", DbType.String, model.ZT);
if (transaction == null)
{
return db.ExecuteNonQuery(dbCommand);
}
else
{
return db.ExecuteNonQuery(dbCommand, transaction);
}
}
catch (AddException addex)
{
addex.DeveloperMessage = "添加c_hbbb_code记录失败！" + addex.Message + "在" + this.ToString() + ".Add(SFS.Entity.Model.c_hbbb_code model)中";
addex.UserMessage = "添加c_hbbb_code记录失败！";
throw addex;
}
}
/// <summary>
/// 更新一条数据
/// </summary>
public int Update(SFS.Entity.Model.c_hbbb_code model)
{
return Update(model, null);
}
/// <summary>
/// 更新一条数据
/// </summary>
public int Update(SFS.Entity.Model.c_hbbb_code model, DbTransaction transaction)
{
try
{
string strSql = "UPDATE c_hbbb_code SET CODENO=@CODENO,CODENAME=@CODENAME,ISMX=@ISMX,ParentCodeNO=@ParentCodeNO,ZT=@ZT WHERE CodeID=@CodeID ";
DbCommand dbCommand = db.GetSqlStringCommand(strSql);
db.AddInParameter(dbCommand, "CodeID", DbType.Int32, model.CodeID);
db.AddInParameter(dbCommand, "CODENO", DbType.String, model.CODENO);
db.AddInParameter(dbCommand, "CODENAME", DbType.String, model.CODENAME);
db.AddInParameter(dbCommand, "ISMX", DbType.String, model.ISMX);
db.AddInParameter(dbCommand, "ParentCodeNO", DbType.String, model.ParentCodeNO);
db.AddInParameter(dbCommand, "ZT", DbType.String, model.ZT);
if (transaction == null)
{
return db.ExecuteNonQuery(dbCommand);
}
else
{
return db.ExecuteNonQuery(dbCommand, transaction);
}
}
catch (UpdateException updateex)
{
updateex.DeveloperMessage = "修改c_hbbb_code记录失败！" + updateex.Message + "在" + this.ToString() + ".Update(SFS.Entity.Model.c_hbbb_code model)中";
updateex.UserMessage = "修改c_hbbb_code记录失败！";
throw updateex;
}
}
/// <summary>
/// 删除一条数据
/// </summary>
public int Delete(string CodeID)
{
return Delete(CodeID, null);
}
/// <summary>
/// 删除一条数据
/// </summary>
public int Delete(string CodeID, DbTransaction transaction)
{
try
{
if (string.IsNullOrEmpty(CodeID))
{
NOIsNullOrEmptyException exception = new NOIsNullOrEmptyException();
exception.DeveloperMessage = "CodeID编号不能为空！在" + this.ToString() + ".Delete(string CodeID)中";
exception.UserMessage = "CodeID编号不能为空！";
throw exception;
}
string strSql = "DELETE FROM c_hbbb_code WHERE CodeID=@CodeID ";
DbCommand dbCommand = db.GetSqlStringCommand(strSql);
db.AddInParameter(dbCommand, "CodeID", DbType.String, CodeID);
if (transaction == null)
{
return db.ExecuteNonQuery(dbCommand);
}
else
{
return db.ExecuteNonQuery(dbCommand, transaction);
}
}
catch (DeleteException deleteex)
{
deleteex.DeveloperMessage = "删除c_hbbb_code记录失败！" + deleteex.Message + "在" + this.ToString() + ".Delete(string CodeID)中";
deleteex.UserMessage = "删除c_hbbb_code记录失败！";
throw deleteex;
}
}
/// <summary>
/// 得到一个对象实体
/// </summary>
public SFS.Entity.Model.c_hbbb_code GetModel(string CodeID)
{
if (string.IsNullOrEmpty(CodeID))
{
NOIsNullOrEmptyException exception = new NOIsNullOrEmptyException();
exception.DeveloperMessage = "CodeID编号不能为空！在" + this.ToString() + ".GetModel(string CodeID)中";
exception.UserMessage = "CodeID编号不能为空！";
throw exception;
}
StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT CodeID,CODENO,CODENAME,ISMX,ParentCodeNO,ZT ");
strSql.Append(" FROM c_hbbb_code ");
strSql.Append(" WHERE CodeID=@CodeID ");
DbCommand dbCommand = db.GetSqlStringCommand(strSql.ToString());
db.AddInParameter(dbCommand, "CodeID", DbType.String, CodeID);
SFS.Entity.Model.c_hbbb_code model = null;
using (IDataReader dataReader = db.ExecuteReader(dbCommand))
{
if (dataReader.Read())
{
model = ReaderBind(dataReader);
}
}
return model;
}
/// <summary>
/// 获得数据列表
/// </summary>
public DataSet GetDataSet(string strWhere)
{
try
{
StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT CodeID,CODENO,CODENAME,ISMX,ParentCodeNO,ZT ");
strSql.Append(" FROM c_hbbb_code ");
if (strWhere.Trim() != "")
{
strSql.Append(" WHERE " + strWhere);
}
return db.ExecuteDataSet(CommandType.Text, strSql.ToString());
}
catch (SelectException selectex)
{
selectex.DeveloperMessage = "查询记录失败！" + selectex.Message + "在" + this.ToString() + ".GetDataSet(string strWhere)中";
selectex.UserMessage = "查询记录失败！";
throw selectex;
}
}
/// <summary>
/// 获得数据列表（比DataSet效率高，推荐使用）
/// </summary>
public List<SFS.Entity.Model.c_hbbb_code> GetList(string strWhere)
{
try
{
StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT CodeID,CODENO,CODENAME,ISMX,ParentCodeNO,ZT ");
strSql.Append(" FROM c_hbbb_code ");
if (strWhere.Trim() != "")
{
strSql.Append(" WHERE " + strWhere);
}
List<SFS.Entity.Model.c_hbbb_code> list = new List<SFS.Entity.Model.c_hbbb_code>();
using (IDataReader dataReader = db.ExecuteReader(CommandType.Text, strSql.ToString()))
{
while (dataReader.Read())
{
list.Add(ReaderBind(dataReader));
}
}
return list;
}
catch (SelectException selectex)
{
selectex.DeveloperMessage = "查询记录失败！" + selectex.Message + "在" + this.ToString() + ".GetList(string strWhere)中";
selectex.UserMessage = "查询记录失败！";
throw selectex;
}
}
/// <summary>
/// 对象实体绑定数据
/// </summary>
public SFS.Entity.Model.c_hbbb_code ReaderBind(IDataReader dataReader)
{
SFS.Entity.Model.c_hbbb_code model = new SFS.Entity.Model.c_hbbb_code();
object obj;
obj = dataReader["CodeID"];
if (obj != null && obj != DBNull.Value)
{
model.CodeID = (int)obj;
}
obj = dataReader["CODENO"];
if (obj != null && obj != DBNull.Value)
{
model.CODENO = obj.ToString();
}
obj = dataReader["CODENAME"];
if (obj != null && obj != DBNull.Value)
{
model.CODENAME = obj.ToString();
}
obj = dataReader["ISMX"];
if (obj != null && obj != DBNull.Value)
{
model.ISMX = obj.ToString();
}
obj = dataReader["ParentCodeNO"];
if (obj != null && obj != DBNull.Value)
{
model.ParentCodeNO = obj.ToString();
}
obj = dataReader["ZT"];
if (obj != null && obj != DBNull.Value)
{
model.ZT = obj.ToString();
}
return model;
}
}
}4.Bll层（跟具体业务有关的逻辑）
namespace SFS.BLL
{
/// <summary>
/// 业务逻辑类bllADDRESS 的摘要说明。
/// </summary>
public class c_hbbb_code
{
private readonly SFS.DAL.c_hbbb_code dal = new SFS.DAL.c_hbbb_code();
public c_hbbb_code()
{ }
#region 成员方法
/// <summary>
/// 是否存在该记录
/// </summary>
public bool Exists(string CodeID)
{
try
{
return dal.Exists(CodeID);
}
catch (ExceptionBase ex)
{
SFS.Utility.ExceptionUtility.ExceptionHelper.HandleException(ex, Policy.BLLPolicy);
return false;
}
}
/// <summary>
/// 增加一条数据
/// </summary>
public int Add(SFS.Entity.Model.c_hbbb_code model)
{
try
{
return dal.Add(model);
}
catch (ExceptionBase ex)
{
SFS.Utility.ExceptionUtility.ExceptionHelper.HandleException(ex, Policy.BLLPolicy);
return 0;
}
}
/// <summary>
/// 更新一条数据
/// </summary>
public int Update(SFS.Entity.Model.c_hbbb_code model)
{
try
{
return dal.Update(model);
}
catch (ExceptionBase ex)
{
SFS.Utility.ExceptionUtility.ExceptionHelper.HandleException(ex, Policy.BLLPolicy);
return 0;
}
}
/// <summary>
/// 删除一条数据
/// </summary>
public int Delete(string CodeID)
{
try
{
return dal.Delete(CodeID);
}
catch (ExceptionBase ex)
{
SFS.Utility.ExceptionUtility.ExceptionHelper.HandleException(ex, Policy.BLLPolicy);
return 0;
}
}
/// <summary>
/// 得到一个对象实体
/// </summary>
public SFS.Entity.Model.c_hbbb_code GetModel(string CodeID)
{
try
{
return dal.GetModel(CodeID);
}
catch (ExceptionBase ex)
{
SFS.Utility.ExceptionUtility.ExceptionHelper.HandleException(ex, Policy.BLLPolicy);
return null;
}
}
/// <summary>
/// 获得数据列表
/// </summary>
public DataSet GetDataSet(string strWhere)
{
try
{
return dal.GetDataSet(strWhere);
}
catch (ExceptionBase ex)
{
SFS.Utility.ExceptionUtility.ExceptionHelper.HandleException(ex, Policy.BLLPolicy);
return null;
}
}
/// <summary>
/// <summary>
/// 获得数据列表
/// </summary>
public List<SFS.Entity.Model.c_hbbb_code> GetList(string strWhere)
{
try
{
return dal.GetList(strWhere);
}
catch (ExceptionBase ex)
{
SFS.Utility.ExceptionUtility.ExceptionHelper.HandleException(ex, Policy.BLLPolicy);
return null;
}
}
#endregion 成员方法
}
}5.UI层（用户界面）
常用界面功能代码
界面模式：单选（新建，删除，修改，查看）
功能名称 |
查询 新建 删除 修改 查看 |
数据列表
|
加载数据 | |
分页 | |
自动加入序号 | |
添加 | |
删除 | |
修改 | |
查看 | |
导出 |
加载数据
privatevoid LoadData(string
{
SFS.Bll.c_hbbb_code objC_SUBCOMPANY=new
this.GridView1.DataSource = objC_SUBCOMPANY.GetList(“”);
this.GridView1.DataBind();
}分页
protectedvoidGridView1_PageIndexChanging(objectsender,GridViewPageEventArgs
{
this.GridView1.PageIndex = e.NewPageIndex;
LoadData(“”);
}绑定时自动加入序号
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
RadioButton rb = (RadioButton)e.Row.FindControl("rbSelect");
rb.Attributes.Add("onclick", "CheckOne(this);");
e.Row.Cells[1].Text = Convert.ToString(e.Row.RowIndex + 1);
}
}添加
protectedvoid btnAdd_Click(object sender, EventArgs
{
Response.Redirect("Add.aspx?JGDM="
}删除
protectedvoid btnUpdate_Click(object sender, EventArgs
{
foreach (GridViewRow row in
{
RadioButton"rbSelect") as RadioButton;
ifnull
{
Label lblID = (Label)row.FindControl("lblJGDM");
Response.Redirect("Delete.aspx?JGDM="
break;
}
}
}修改
protectedvoid btnUpdate_Click(object sender, EventArgs
{
foreach (GridViewRow row in
{
RadioButton"rbSelect") as RadioButton;
ifnull
{
Label lblID = (Label)row.FindControl("lblJGDM");
Response.Redirect("Update.aspx?JGDM="
break;
}
}
}一般写界面代码逻辑顺序
步骤 | |||
1 | Page_Load | 中判断Session是否超时。 | |
获取页面参数。 | |||
加载初始化控件（DropDownList，TextBox等控件）。 | 调用BBL层。 | ||
执行初始化查询绑定GridView控件。 | 调用BBL层。 | ||
2 | Button_Click | 判断界面参数设置数据有效性 | 脚本判断，或页面上后台代码判断。 |
处理数据一般包括。 增加：跳转到增加页面。 删除：删除前要提示。 修改：先判断是否选中，跳转到修改页面，需要传递参数。 查询：先检查查询条件的有效性，再执行查询。 | 调用BLL层 | ||
判断是否刷新页面。 | |||
3 | GridView | 一般性代码（分页，加单选，多选处理，绑定超连接，特殊列处理） | |
获得选种行，传递相关参数。 | |||
4 | 其他特殊处理 |
