数据库:SQL Server 2000

Model,   即实体类,使用CodeSmith根据数据库表自动生成．这个是最常用的．

数据访问层,   最简单的增删改查操作也是使用CodeSmith根据数据库表配合SQLHelper类自动生成．

这层的设计,先贴点未完工的代码给大家参考参考.

1.DalCode.cs

using System;
using System.Collections.Generic;
using System.Text;
using CodeSmith;
using SchemaExplorer;
using CodeSmith.CustomProperties;

namespace DalCode
...{
    /**//// <summary>
    /// CodeSmith的DAL模板的代码类
    /// </summary>
    public class DalCode
    ...{
        //表
        private TableSchema Table;

        /**//// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="table"></param>
        public DalCode(SchemaExplorer .TableSchema table)
        ...{
            Table = table;
        }
       
        /**//// <summary>
        /// 获取Insert方法所需字段名
        /// </summary>
        /// <returns></returns>
        public NameValueCollection GetInsertParm()
        ...{
            NameValueCollection parm = new NameValueCollection();
            foreach(ColumnSchema cs in Table .Columns)
            ...{
                if(!IsIdentity (cs))
                ...{
                    if(!IsDefault (cs))
                    ...{
                        parm.Add(cs.Name,ToSQLType (cs.DataType.ToString()));
                    }
                }
            }
           
            return parm;
        }

        /**//// <summary>
        /// 获取Delete方法所需字段名
        /// </summary>
        /// <returns></returns>
        public NameValueCollection GetDeleteParm()
        ...{
            NameValueCollection parm = new NameValueCollection();

            foreach (ColumnSchema cs in Table.Columns)
            ...{
                if (IsIdentity(cs))
                ...{
                    parm.Add(cs.Name, cs.DataType.ToString());
                }
            }
            return parm;
        }

        /**//// <summary>
        /// 获取Update方法所需字段名
        /// </summary>
        /// <returns></returns>
        public NameValueCollection GetUpdateParm()
        ...{
            NameValueCollection parm = new NameValueCollection();

            foreach (ColumnSchema cs in Table.Columns)
            ...{
                if (!IsIdentity(cs))
                ...{
                    parm.Add(cs.Name, cs.DataType.ToString());
                }
            }

            return parm;
        }

        /**//// <summary>
        /// 获取Select方法所需字段名
        /// </summary>
        /// <returns></returns>
        public NameValueCollection GetSelectParm()
        ...{
            NameValueCollection parm = new NameValueCollection();

            foreach (ColumnSchema cs in Table.Columns)
            ...{
                if (IsIdentity(cs))
                ...{
                    parm.Add(cs.Name, cs.DataType.ToString());
                }
            }

            return parm;
        }

        /**//// <summary>
        /// 检查字段是否为标识符
        /// </summary>
        /// <param name="cs"></param>
        /// <returns></returns>
        private bool IsIdentity(ColumnSchema cs)
        ...{
            return (bool)cs.ExtendedProperties["CS_IsIdentity"].Value;
        }

        /**//// <summary>
        /// 检查字段是否有默认值
        /// </summary>
        /// <param name="cs"></param>
        /// <returns></returns>
        private bool IsDefault(ColumnSchema cs)
        ...{
            if ((String)cs.ExtendedProperties["CS_Default"].Value == "")
            ...{
                return false;
            }

            return true;
        }

        /**//// <summary>
        /// 将数据类型转换成SQL数据类型
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        private string ToSQLType(string type)
        ...{
            switch (type)
            ...{
                case "AnsiString":
                    return "SqlDbType.VarChar";
                    break;
                default :
                    return type;
            }
        }
    }
}
 

2. dal.cst     CodeSmith模板文件

<%--
Name:
Author:
Description:
--%>
<%@ CodeTemplate Language="C#"  TargetLanguage="Text" ResponseEncoding="UTF-8" Description="Template description here." %>
<%@ Assembly Name="SchemaExplorer" %>
<%@ Import Namespace="SchemaExplorer" %>
<%@ Assembly Name="CodeSmith.CustomProperties" %>
<%@ Import Namespace="CodeSmith.CustomProperties" %>
<%@ Assembly Name="DalCode" %>
<%@ Import Namespace="DalCode" %>

<%@ Property Name="Table" Type="SchemaExplorer.TableSchema" Category="Context" Description="?????." %>
<%@ Property Name="NameSpace" Type="System.String" Default="Company.Product.Module" Optional="False" Category="" Description="????" %>
<%@ Property Name="Author" Type="System.String" Default="Author" Optional="False" Category="" Description="??" %>
<%@ Property Name="Description" Type="System.String" Default="Description" Optional="False" Category="" Description="Description" %>
<%@ Property Name="ClassName" Type="System.String" Default="ClassName" Optional="False" Category="" Description="??" %>
<%@ Property Name="InsertParm" Type="CodeSmith.CustomProperties.NameValueCollection" Default="" Optional="true" Category="" Description=""%>
<%@ Property Name="DeleteParm" Type="CodeSmith.CustomProperties.NameValueCollection" Default="" Optional="true" Category="" Description=""%>
<%@ Property Name="UpdateParm" Type="CodeSmith.CustomProperties.NameValueCollection" Default="" Optional="true" Category="" Description=""%>
<%@ Property Name="SelectParm" Type="CodeSmith.CustomProperties.NameValueCollection" Default="" Optional="true" Category="" Description=""%>
<%@ Property Name="ModelType" Type="System.String" Default="ModelType" Optional="False" Category="" Description="??" %>
<%@ Property Name="ModelName" Type="System.String" Default="ModelName" Optional="False" Category="" Description="??" %>
using System;

namespace <%= NameSpace %>
...{
    /**//// <summary>
    /// 作用:<%= Description %>
    /// 作者:<%= Author %>
    /// 日期:<%= DateTime.Now.ToString() %>
    ///</summary>
    public class <%= ClassName%>
    ...{
          <%
            DalCode dal = new DalCode(Table);
            InsertParm = dal.GetInsertParm();   
            string InsertName = InsertParm[0].Key;
            string InsertValue = "@" + InsertParm[0].Key;
            for(int i = 1;i < InsertParm.Keys.Count;i++)
            ...{
                InsertName += ",";
                InsertName += InsertParm[i].Key;
               
                InsertValue += ",";
                InsertValue += "@" + InsertParm[i].Key;
            }

            DeleteParm = dal .GetDeleteParm ();   
           
            UpdateParm = dal.GetUpdateParm ();   
            string UpdateString = UpdateParm[0].Key + " = @" + UpdateParm[0].Key;
            for(int i = 1;i < UpdateParm.Keys.Count;i++)
            ...{
                UpdateString += ",";
                UpdateString += UpdateParm[i].Key + " = @" + UpdateParm[i].Key;
            }
           
            SelectParm = dal.GetSelectParm ();   
        %>
       
        private const string SQL_INSERT_TOPIC = "INSERT INTO <%=Table.Name%> (<%=InsertName%>) VALUES(<%=InsertValue%>)";
        private const string SQL_DELETE_TOPIC = "DELETE FROM <%=Table.Name%> WHERE <%=DeleteParm[0].Key%> = @<%=DeleteParm[0].Key%>";
        private const string SQL_UPDATE_TOPIC = "UPDATE <%=Table.Name%> SET <%=UpdateString%> WHERE <%=DeleteParm[0].Key%> = @<%=DeleteParm[0].Key%>";
        private const string SQL_SELECT_TOPIC = "SELECT * FROM <%=Table.Name%> WHERE <%=SelectParm[0].Key%> = @<%=SelectParm[0].Key%>";
       
        /**//// <summary>
        /// INSERT
        /// </summary>
        /// <returns></returns>
        public int Insert(<%=ModelType%> <%=ModelName%>)
        ...{
            SqlParameter[] insertParm = GetInsertParameters();
            <%
            for(int i = 0;i < InsertParm.Keys.Count;i++)
            ...{
            %>
            insertParm[<%=i%>].Value = <%=ModelName%>.<%=InsertParm[i].Key%>;
            <%
            }
            %>
           
            int val = SQLHelper.ExecuteNonQuery(SQLHelper.CONN_STRING_NON_DTC, CommandType.Text, SQL_INSERT_TOPIC, insertParm);

            return val;
        }
       
        /**//// <summary>
        /// 获取SELECT操作的SQL参数
        /// </summary>
        /// <returns></returns>
        public static SqlParameter[] GetInsertParameters()
        ...{
            SqlParameter[] parms = SQLHelper.GetCachedParameters(SQL_INSERT_TOPIC);

            if (parms == null)
            ...{
                parms = new SqlParameter[]
                ...{
                <%
                for(int i = 0;i < InsertParm.Keys.Count;i++)
                ...{
                %>
                    new SqlParameter("@<%=InsertParm[i].Key%>",<%=InsertParm[i].Value%>),
                   <%
                }
                %>
                };

                SQLHelper.CacheParameters(SQL_INSERT_TOPIC, parms);
            }

            return parms;
        }
    }
}