.NET之Dapper框架运用

Posted 2020-10-03 专业.net码农

Dapper框架

1.项目引用Dapper的Nuget程序包;

2.配置链接类

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Dapper
{
    public class DapperConn
    {
        public static IDbConnection GetConnection()
        {
            string connStr = ConfigurationManager.AppSettings["conn"];
            return new SqlConnection(connStr);
        }
    }   
}

3.配置相应表的实体对象

目前是一个用户表和一个用户登录日志表为例：

用户表

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Dapper
{
    public class UserModel
    {
        public Int32 Id { get; set; }

        public String Key { get; set; }

        public String Value { get; set; }

    }
}

用户登录日志表

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Dapper
{
    public class UserLoginLog
    {
        public Int32 Id { get; set; }

        public Int32 UserId { get; set; }

        public DateTime CreateTime { get; set; }
        
    }
}

4.通过实体对数据库操作

(包含基本的：增删改查及事务提交操作)

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Dapper
{
    public class DB
    {
       
        public int Add(UserModel model)
        {
            using (var conn = DapperConn.GetConnection())
            {
                string sql = "Insert into User (Key,Value) Value (@Key,@Value)";
                return conn.Execute(sql, model);
            }
        }

        public int Update(UserModel model)
        {
            using (var conn = DapperConn.GetConnection())
            {
                string sql = "update User set [email protected],[email protected] where [email protected]";
                return conn.Execute(sql, model);
            }
        }
        public int Del(UserModel model)
        {
            using (var conn = DapperConn.GetConnection())
            {
                string sql = "Delete from User where [email protected]";
                return conn.Execute(sql, model);
            }
        }

        public UserModel GetModel()
        {
            using (var conn = DapperConn.GetConnection())
            {
                var sql = "Select Id,Key,Value from User";
                return conn.QueryFirstOrDefault<UserModel>(sql);
            }
        }

        public IEnumerable<UserModel> GetModels()
        {
            using (var conn = DapperConn.GetConnection())
            {
                var sql = "Select Id,Key,Value from User";
                return conn.Query<UserModel>(sql);
            }
        }

        public void ImplementAffair(UserModel userModel, UserLoginLog userLogModel)
        {
            using (var conn = DapperConn.GetConnection())
            {
                IDbTransaction tran = conn.BeginTransaction();
                try
                {
                    string query = "Update User set Key=‘测试‘ where [email protected]";//更新一条记录
                    conn.Execute(query, userModel, tran, null, null);

                    query = "insert into UserLoginLog (userId,CreateTime) value (@userId,@CreateTime)";//删除一条记录
                    conn.Execute(query, userLogModel, tran, null, null);

                    //提交
                    tran.Commit();
                }
                catch (Exception ex)
                {
                    //提交错误
                    //回滚事务
                    tran.Rollback();
                }
            }
        }
    }
}