自己动手写ORM框架

提起ORM框架,大家都很熟悉，网上流行的ORM框架有很多，其中出名的有一些，不出名的更是数不胜数。

 

下面是自己实现的一个简单的ORM框架,实现了常用的增删查改功能,供大家研究ORM实现原理。

功能描述：

   1.支持Update语句

   2.支持Insert语句

   3. 支持Delete语句

   4.支持事务

   5.支持自定义增删查改语句

   6.支持单表查询 ，多表查询

   7.支持排序，分页语句

   8.结果集可以是DataTable  也可 以是 List 泛型集合，还可以是实体对象

   9.结果集支持foreach 遍历

   10.支持Oracle和MSSQLServer数据库

大部分常用功能下面代码已做了演示

  

DbMapper.1.0.0.3.下载地址

 

 示例：

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Text;
  4 using DBMapper;
  5 using System.Data;
  6 
  7 namespace DbMapperTest
  8 {
  9     class Program
 10     {
 11         static void Main(string[] args)
 12         {
 13             try
 14             {
 15                 string str_ticks=System.DateTime.Now.Ticks.ToString();
 16                 int jlbh = int.Parse(str_ticks.Substring(str_ticks.Length - 8, 8));
 17                 //---oracle测试
 18                 using (var dbMap = DbMapper.CreateDbMapper(DbMapper.PROVIDER_ORACLE,
 19                      "Password=test;User ID=test;Data Source=(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)"
 20                      + "(HOST=localhost)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=testdb)));"))
 21                 
 22                 //----sqlserver测试
 23                 //using(var dbMap=DbMapper.CreateDbMapper(DbMapper.PROVIDER_SQLSERVER,"Data Source=DINT-PC;Integrated Security=True; database=TEST"))
 24                 {
 25                     //插入记录
 26                     dbMap.Insert(new Person
 27                     {
 28                         JLBH = jlbh,
 29                         NAME = "索额图",
 30                         ADDRESS = "皇宫",
 31                         AGE = 30,
 32                         PNO = "zzzzzzzzzzzzzzzzz"
 33                     });
 34                     
 35                     dbMap.Insert(new Course()
 36                     {
 37                         JLBH = jlbh,
 38                         NAME = "计算机科学与技术",
 39                         TIME = DateTime.Now.ToString()
 40                     });
 41                     dbMap.Insert(new PersonCourse()
 42                     {
 43                         COUR_ID = jlbh,
 44                         PERSON_ID = jlbh,
 45                     });
 46                     dbMap.Execute(false);
 47                     if(dbMap.Query("select * from Person where JLBH=:JLBH",new Person{JLBH=jlbh}).Count>0)
 48                     Console.WriteLine("插入Person记录{0}成功", jlbh);
 49 
 50                     if (dbMap.Query("select * from Course where JLBH=:JLBH", new Course { JLBH = jlbh }).Count > 0)
 51                     Console.WriteLine("插入Course记录{0}成功", jlbh);
 52 
 53                     if (dbMap.Query("select * from PERSON_COURSE where PERSON_ID=:PERSON_ID", new PersonCourse { PERSON_ID = jlbh }).Count > 0)
 54                     Console.WriteLine("插入PersonCourse记录{0}成功", jlbh);
 55 
 56 
 57                     /*----------------修改--------------------------*/  
 58                     Console.WriteLine(""); 
 59                     Console.WriteLine("-----------------修改-----------------");
 60                     dbMap.Update(new Course { 
 61                        JLBH=jlbh,
 62                        NAME = "计算机科学与技术（修正版）"
 63                     });
 64                     int aff=dbMap.Execute();
 65                     if (aff > 0) {
 66                         Console.WriteLine("插入Course记录{0}成功", jlbh);
 67                     }
 68                     
 69                     
 70                     /*----------------单记录查询---------------*/
 71                     Console.WriteLine(""); 
 72                     Console.WriteLine("----------------单记录查询---------------");
 73                     //动态对象传递参数 .NET4.0及以上版本才支持的
 74                     Person aPerson = dbMap.Query("select * from Person where JLBH=:JLBH",
 75                     new {
 76                         JLBH=jlbh
 77                     }).First;
 78                     Console.WriteLine("{0} {1} {2} {3}", aPerson.JLBH, aPerson.NAME, aPerson.PNO, aPerson.ADDRESS);
 79 
 80                     /*------------------------foreach遍历结果集--------------------------------*/
 81                     Console.WriteLine("");
 82                     Console.WriteLine("--------foreach遍历结果集-------------");
 83                     foreach (Person cc in dbMap.Query(@"select P.JLBH PERSON#JLBH,P.NAME PERSON#NAME,P.PNO,P.ADDRESS,P.AGE,
 84                        C.NAME COURSE#NAME,C.TIME from PERSON P,COURSE C,PERSON_COURSE PC
 85                        where P.JLBH=PC.PERSON_ID and C.JLBH=PC.COUR_ID", null, null, null).OrderBy("PERSON#JLBH", true).Take(5))
 86                     {
 87                         Console.WriteLine("{0} {1} {2}", cc.JLBH, cc.NAME, cc.PNO);
 88                     }
 89 
 90                     /*------------------------------返回结果数量 Count属性-------------------------------------*/
 91                     Console.WriteLine(""); Console.WriteLine(""); 
 92                     Console.WriteLine("-------------------返回结果数量 Count属性-----------------");
 93                     int countPersons = dbMap.Query("select * from Person", null).Count;
 94                     Console.WriteLine(countPersons.ToString());
 95 
 96                     /*---------------------------多表查询----------------------------------------*/
 97                     Console.WriteLine(""); Console.WriteLine("");
 98                     Console.WriteLine("--------------------多表查询----------------------");
 99                     
100                     DataTable at = dbMap.Query