Dapper入门学习

今天了解并学习了下Dapper的用法，这里简单介绍下

1.安装Nuget Dapper Package包

2.代码

using (IDbConnection connection = new SqlConnection("server=.;database=Test;uid=sa;pwd=123456"))
            {

　　　　　　　　　　
　　　　　　　　　//通过connection.Execute（sql，object）方法执行增删改
                //UserInfo userInfo = new UserInfo();
                //userInfo.Id = Guid.NewGuid();
                //userInfo.UserName = "aa";
                //userInfo.Name = "张三";
                //string sql = "insert into UserInfo values(@id,@userName,@name)";
                //connection.Execute(sql, userInfo);

                //connection.Execute(sql, new
                //{
                //    Id = Guid.NewGuid(),
                //    UserName = "bb",
                //    Name = "张三1"
                //});


                //UserInfo userInfo = new UserInfo();
                //userInfo.Id = Guid.NewGuid();
                //userInfo.UserName = "aa";
                //userInfo.Name = "张三";

                //Comment comment = new Comment();
                //comment.Id = Guid.NewGuid();
                //comment.Content = "东西挺好的";
                //comment.UserInfoId = userInfo.Id;
                // string sql = "insert into UserInfo values(@id,@userName,@name)";
                //connection.Execute(sql, userInfo);
                //string sql1 = "insert into Comment values(@id,@Content,@UserInfoId)";
                //connection.Execute(sql1, comment);



                //userInfo.Name = "李四";
                //string sqlupdate = "update UserInfo set name = @name where username=@username";
                //connection.Execute(sqlupdate, userInfo);



                //string sqldelete = "delete from userinfo where username = @username";
                //connection.Execute(sqldelete, userInfo);


　　　　　　　　　//通过connection.Query(sql)执行查询
                // string query = "select * from userinfo";
                // var list =  connection.Query(query).ToList();
                // foreach (dynamic d in list)
                // {
                //     Console.WriteLine(d.UserName);
                // }


                // string query1 = "select * from userinfo where username = @username";
                //List<UserInfo> userInfos = connection.Query<UserInfo>(query1, new {username = "bb"}).ToList();
                // foreach (UserInfo d in userInfos)
                // {
                //     Console.WriteLine(d.UserName);
                // }



                string query = "select * from userinfo u left join comment c on u.id=c.userInfoId";
                ////Query<TFirst, TSecond, TReturn>
                //List<UserInfo> userInfos = connection.Query<UserInfo, Comment, UserInfo>(query,
                //    (userInfo, comment) =>
                //    {
                //        if (userInfo.Comments == null)
                //        {
                //            userInfo.Comments = new List<Comment>();
                //        }
                //        userInfo.Comments.Add(comment);
                //        return userInfo;
                //    }
                //).ToList();

　　　　　　　　　　//通过connection.QueryMultiple(sql)一次查询多个实体
                //using (var multi = connection.QueryMultiple(query))
                //{
                //    var userInfoss = multi.Read<UserInfo>().ToList();

                //    foreach (var userInfo in userInfoss)
                //    {
                //        Console.WriteLine(userInfo.UserName);
                //    }
                //}


                //var user = connection.Query<UserInfo>("uspGetUser", new {id = "1A61D9E8-A295-4844-8EB1-3F390657CFBB"},
                //    commandType: CommandType.StoredProcedure).SingleOrDefault();
                //Console.WriteLine(user.Name);





              
                Console.ReadKey();
            }