Entity Framework底层操作封装V2版本(4)
这个版本里面,因为涉及到了多库的操作,原有的系统方法不能做到这样的事情了。所以这里有了一点区别
这个类的主要用作就是,连接字符串的作用,默认是指向默认配置里面的,但是你可以指向其他的连接
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Configuration;
- namespace JFrame.Dal
- {
- public class DataBaseConnectionString
- {
- private static string _ConnectionString;
- public DataBaseConnectionString(string ConnectionString)
- {
- _ConnectionString = ConnectionString;
- }
- public static string GetConnectionString()
- {
- if (string.IsNullOrEmpty(_ConnectionString))
- {
- _ConnectionString = ConfigurationSettings.AppSettings["ConnectinString"]??"";
- if (string.IsNullOrEmpty(_ConnectionString))
- {
- throw new Exception("数据库连接没有配置,请配置相关数据库连接");
- }
- }
- return "name="+_ConnectionString;
- }
- }
- }
而Dal的Base类就调用这个方法进行实例化
- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using JFrame.AccessCommon;
- using System.Data.Objects.DataClasses;
- namespace JFrame.Dal
- {
- public class DalBaseData<T> : AccessBase<T> where T : EntityObject
- {
- public DalBaseData() : base(ConnectionString: DataBaseConnectionString.GetConnectionString()) { }
- public DalBaseData(string PrimaryKey = "", string strTableName = "", string QueryColums = "") : base(ConnectionString: DataBaseConnectionString.GetConnectionString(), PrimaryKey: PrimaryKey, strTableName: strTableName, QueryColums: QueryColums)
- {
- }
- }
- }
http://blog.csdn.net/jacky4955/article/details/25412755