C#中Dapper的使用教程

2021-07-01 19:07:12 来源:易采站长站 作者:

C#中Dapper的使用教程,语句,实体,类型,批量,这是

C#中Dapper的使用教程

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一、什么是Dapper

  Dapper是一款轻量级ORM工具(Github)。如果你在小的项目中,使用Entity Framework、NHibernate 来处理大数据访问及关系映射,未免有点杀鸡用牛刀。你又觉得ORM省时省力,这时Dapper 将是你不二的选择。

二、Dapper的优点

轻量。只有一个文件SqlMapper.cs,编译后就40K的一个很小的Dll. 速度快。Dapper的速度接近与IDataReader,取列表的数据超过了DataTable。 支持多种数据库。Dapper可以在所有Ado.net Providers下工作,包括sqlite, sqlce, firebird, oracle, MySQL, PostgreSQL and SQL Server 可以映射一对一,一对多,多对多等多种关系。 性能高。通过Emit反射IDataReader的序列队列,来快速的得到和产生对象,性能不错。 支持FrameWork2.0,3.0,3.5,4.0,4.5 Dapper语法十分简单。并且无须迁就数据库的设计。

三、使用方法

  1、添加NuGet程序包Dapper

  

  2、配置文件添加连接数据库的字符串

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/>
  </startup>
  <connectionStrings>
    <add name="MyStrConn" connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=DHR_DB;Integrated Security=True" />
  </connectionStrings>
</configuration>

  3、添加DapperTools.cs(添加、批量添加、删除、批量删除、修改、批量修改、查询、查询in的操作、多语句操作)

// <copyright file="DapperTools.cs" company="PlaceholderCompany">
// Copyright (c) PlaceholderCompany. All rights reserved.
// </copyright>

namespace CSharpStudy
{
    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;
    using Dapper;

    internal class DapperTools
    {
        public static string ConnectionString = ConfigurationManager.ConnectionStrings["MyStrConn"].ConnectionString;

        /// <summary>
        /// 添加.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <param name="t">传入实体类型.</param>
        /// <returns>int.</returns>
        public static int Add<T>(string sql, T t)
            where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Execute(sql, t);
            }
        }

        /// <summary>
        /// 批量添加.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <param name="t">传入泛型类.</param>
        /// <returns>int.</returns>
        public static int Add<T>(string sql, List<T> t)
            where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Execute(sql, t);
            }
        }

        /// <summary>
        /// 删除.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <param name="t">传入实体类型.</param>
        /// <returns>int.</returns>
        public static int Delete<T>(string sql, T t)
              where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Execute(sql, t);
            }
        }

        /// <summary>
        /// 批量删除.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <param name="t">传入泛型类.</param>
        /// <returns>int.</returns>
        public static int Delete<T>(string sql, List<T> t)
              where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Execute(sql, t);
            }
        }

        /// <summary>
        /// 修改.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <param name="t">传入实体类型.</param>
        /// <returns>int.</returns>
        public static int Update<T>(string sql, T t)
              where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Execute(sql, t);
            }
        }

        /// <summary>
        /// 批量修改.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <param name="t">传入泛型类.</param>
        /// <returns>int.</returns>
        public static int Update<T>(string sql, List<T> t)
              where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Execute(sql, t);
            }
        }

        /// <summary>
        /// 查询.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <returns>泛型类.</returns>
        public static List<T> Query<T>(string sql)
             where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Query<T>(sql).ToList();
            }
        }

        /// <summary>
        /// 查询指定数据.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <param name="t">传入泛型类.</param>
        /// <returns>类.</returns>
        public static T Query<T>(string sql, T t)
             where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Query<T>(sql, t).SingleOrDefault();
            }
        }

        /// <summary>
        /// 查询的in操作.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        /// <returns>泛型类.</returns>
        public static List<T> Query<T>(string sql, int[] ids)
            where T : class
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                return connection.Query<T>(sql, new { ids }).ToList();
            }
        }

        /// <summary>
        /// 多语句操作.
        /// </summary>
        /// <typeparam name="T">实体类型.</typeparam>
        /// <param name="sql">传入sql执行语句.</param>
        public static void QueryMultiple(string sql)
        {
            using (IDbConnection connection = new SqlConnection(ConnectionString))
            {
                var multiReader = connection.QueryMultiple(sql);
                var userInfo = multiReader.Read<UserInfo>();
                var student = multiReader.Read<Student>();

                multiReader.Dispose();
            }
        }
    }
}

  4、添加测试类Student.cs、UserInfo。表数据自己添加

 public class Student
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }

        public string Memo { get; set; }

        public DateTime CreateTime { get; set; }

        public DateTime UpdateTime { get; set; }
    }
public class UserInfo
    {
        public int Id { get; set; }

        public string Name { get; set; }

        public int Age { get; set; }

        public string Memo { get; set; }

        public DateTime CreateTime { get; set; }

        public DateTime UpdateTime { get; set; }
    }

  5、调用方法

//-----------------------------------------------------------------------
// <copyright file="Program.cs" company="PlaceholderCompany">
// Copyright (c) PlaceholderCompany. All rights reserved.
// </copyright>
// <author>John Doe</author>
//-----------------------------------------------------------------------

namespace CSharpStudy
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using Dapper;

    internal class Program
    {
        private static void Main(string[] args)
        {
            // --------------添加--------------
            // UserInfo user = new UserInfo();
            // user.Name = "九九";
            // user.Age = 10;
            // user.Memo = "这是备注";
            // user.CreateTime = DateTime.Now;

            // string sql = "Insert into UserInfo(Name,Age,Memo,CreateTime) values (@name, @Age, @Memo,@CreateTime)";
            // int result = DapperTools.Add<UserInfo>(sql, user);
            // if (result > 0)
            // {
            //     Console.WriteLine("添加成功");
            //     Console.ReadKey();
            // }

            // --------------批量添加--------------
            // UserInfo user = new UserInfo();
            // user.Name = "李奎";
            // user.Age = 50;
            // user.Memo = "这是备注";
            // user.CreateTime = DateTime.Now;

            // UserInfo user2 = new UserInfo();
            // user2.Name = "梁山伯";
            // user2.Age = 54;
            // user2.Memo = "这是备注";
            // user2.CreateTime = DateTime.Now;

            // List<UserInfo> list = new List<UserInfo>();
            // list.Add(user);
            // list.Add(user2);

            // string sql = "Insert into UserInfo(Name,Age,Memo,CreateTime) values (@name, @Age, @Memo,@CreateTime)";
            // int result = DapperTools.Add<UserInfo>(sql, list);
            // if (result > 0)
            // {
            //     Console.WriteLine("添加成功");
            //     Console.ReadKey();
            // }

            // --------------删除--------------
            // UserInfo user = new UserInfo();
            // user.Id = 18;

            // string sql = "delete from UserInfo where Id=@Id";
            // int result = DapperTools.Delete<UserInfo>(sql, user);
            // if (result > 0)
            // {
            //     Console.WriteLine("删除成功");
            //     Console.ReadKey();
            // }

            // --------------批量删除--------------
            // UserInfo user = new UserInfo();
            // user.Id = 15;

            // UserInfo user2 = new UserInfo();
            // user2.Id = 16;

            // List<UserInfo> list = new List<UserInfo>();
            // list.Add(user);
            // list.Add(user2);

            // string sql = "delete from UserInfo where Id=@Id";
            // int result = DapperTools.Delete<UserInfo>(sql, list);
            // if (result > 0)
            // {
            //     Console.WriteLine("添加成功");
            //     Console.ReadKey();
            // }

            // --------------修改--------------
            // UserInfo user = new UserInfo();
            // user.Id = 14;
            // user.Name = "九九";

            // string sql = "update UserInfo set Name=@Name,UpdateTime=GETDATE() where Id=@ID";
            // int result = DapperTools.Update<UserInfo>(sql, user);
            // if (result > 0)
            // {
            //     Console.WriteLine("修改成功");
            //     Console.ReadKey();
            // }

            // --------------批量修改--------------
            // UserInfo user = new UserInfo();
            // user.Id = 13;
            // user.Name = "王文";

            // UserInfo user2 = new UserInfo();
            // user2.Id = 14;
            // user2.Name = "冰冰";

            // List<UserInfo> list = new List<UserInfo>();
            // list.Add(user);
            // list.Add(user2);

            // string sql = "update UserInfo set Name=@Name,UpdateTime=GETDATE() where Id=@ID";
            // int result = DapperTools.Update<UserInfo>(sql, list);
            // if (result > 0)
            // {
            //     Console.WriteLine("修改成功");
            //     Console.ReadKey();
            // }

            // --------------查询--------------
            // string sql = "select * from UserInfo";
            // List<UserInfo> list = DapperTools.Query<UserInfo>(sql);
            // foreach (var item in list)
            // {
            //     Console.WriteLine(item.Id + "-" + item.Name + "-" + item.Age + "-" + item.Memo);
            // }

            // Console.ReadKey();

            // --------------查询指定数据--------------
            // UserInfo user = new UserInfo();
            // user.Id = 14;

            // string sql = "select * from UserInfo where Id=@Id";
            // UserInfo userInfo = DapperTools.Query<UserInfo>(sql, user);

            // Console.WriteLine(userInfo.Id + "-" + userInfo.Name + "-" + userInfo.Age + "-" + userInfo.Memo);
            // Console.ReadKey();

            // --------------查询的in操作--------------
            // string sql = "select * from UserInfo where Id in @ids";
            // int[] ids = { 1, 2 };

            // List<UserInfo> list = DapperTools.Query<UserInfo>(sql, ids);
            // foreach (var item in list)
            // {
            //     Console.WriteLine(item.Id + "-" + item.Name + "-" + item.Age + "-" + item.Memo);
            // }

            // --------------多语句操作--------------
            // string sql = "select * from userinfo;select * from student";

            // DapperTools.QueryMultiple(sql);
        }
    }
}

源代码:

链接: https://pan.baidu.com/s/1IM3diCqJCoSpvr11H6zddQ

提取码: 6ag9

后续会陆续更新其他资料,喜欢请关注哦!

我的博客:https://www.cnblogs.com/duhaoran

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