Dapper试用

以下代码摘自 imfunny 的<给力分享新的ORM => Dapper> http://www.cnblogs.com/imfunny/archive/2011/09/16/2178829.html

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.Data;

using Dapper;

namespace ConsoleApplication1

{

    class Program

    {

        public static readonly string sqlconnectionString = "Data Source=localhost;Initial Catalog=Test;User Id=admindsl;Password=a4w8c3k5;";

        static void Main(string[] args)

        {

            SqlConnection connection = GetOpenConnection(sqlconnectionString);

            //插入100000条数据到数据库

            //for (int i = 0; i < 100000; i++)

            //{

            //    connection.Execute("INSERT INTO dog (Age,Name,Weight) VALUES (@age,@name,@Weight)",

            //      new { @age = i, @name = Guid.NewGuid().ToString(), @Weight = i });//System.Guid.NewGuid().ToString()全球唯一标识符 (GUID) 是一个字母数字标识符，用于指示产品的唯一性安装。

            //}



            //获取单条记录

            //var edog = connection.Query<Dog>("select * from dog where id = @Id", new { Id = 2 }).Single<Dog>();

            var edog = connection.Query<Dog>("select * from dog where id = @Id", new { Id = 3 }).SingleOrDefault<Dog>();

            Console.WriteLine("{0} : {1}", edog.Name, edog.Id);

            Console.WriteLine();



            //获取前十条记录

            IList<Dog> dogs = connection.Query<Dog>("select * from dog where id <= 10", null).ToList();

            foreach (Dog dg in dogs)

            {

                Console.WriteLine("{0} : {1}", dg.Name, dg.Id);

            }





            Console.Read();

        }

        public static SqlConnection GetOpenConnection(string x)

        {

            SqlConnection connection = new SqlConnection(x);

            connection.Open();

            return connection;

        }

    }

    public class Dog

    {

        public int Age { get; set; }



        public int Id { get; set; }



        public string Name { get; set; }



        public int Weight { get; set; }



        public int IgnoredProperty

        {

            get

            {

                return 1;

            }

        }



    }



}

Dapper保持目前的API,保持精确的定位是非常正确, 非常必须的.否则又是一个大而全的重型机器,失去它的优势.
如Connection, Transaction不由Dapper内部管理, 这个定位真是太绝了

 

想写linq的话使用这个扩展。地址这里http://sqlinq.codeplex.com/
SQLinq.Dapper
语法如下。

IEnumerable<Person> data = null;

using(IDbConnection con = GetDbConnection())

{

    con.Open();

    data = con.Query(

        from p in SQLinq<Person>()

        where p.FirstName.StartsWith("C") && p.Age > 21

        orderby p.FirstName

        select p

    );

    con.Close();

}

单表的映射是这样的Query<Dog>(sqlquery,parmar);
多表的是这样Query<Dog，Content,Dog>(sqlquery,(Content,Dog) => Dog.dd = Content.id，。。。。);

 

更加简化的事务机制

ar trans = conn.BeginTransaction(); 

              conn.Execute(query, info);

              trans.Commit();

数据库的关闭

const string query = "DELETE FROM `ex_admin` WHERE adminid = {0};";

           using (var conn = Database.DbService())

           {

               conn.Execute(string.Format(query, adminid), null);

           }

测试速度代码一

private void TestDapper()

{

    StringBuilder strSql = new StringBuilder();

    strSql.Append("SELECT EmployeeID,EmployeeNO,EmployeeName,DepartmentID,LoginNo,LoginPWD,IsLogin,GroupID,IsDeleted,Operator,InputDate,EditDate ");

    strSql.Append("FROM Employee ");

    IList<EmployeeInfo> list;

    IDbConnection conn = new SqlConnection(connectionString);

 

    conn.Open();

    sw.Reset();

    sw.Start();

    list = conn.Query<EmployeeInfo>(strSql.ToString(), null).ToList();

    conn.Close();

    sw.Stop();

 

    MessageBox.Show(list.Count.ToString());

}

 

private void TestPeta()

{

    StringBuilder strSql = new StringBuilder();

    strSql.Append("SELECT EmployeeID,EmployeeNO,EmployeeName,DepartmentID,LoginNo,LoginPWD,IsLogin,GroupID,IsDeleted,Operator,InputDate,EditDate ");

    strSql.Append("FROM Employee ");

    PetaPoco.Database mcc = new PetaPoco.Database(connectionString, "System.Data.SqlClient");

    sw.Reset();

    sw.Start();

    IList<EmployeeInfo> list = mcc.Query<EmployeeInfo>(strSql.ToString(), null).ToList();

    sw.Stop();

    MessageBox.Show(list.Count.ToString());

 

}