C#中Dapper的使用教程
作者：奇然
Dapper是一款轻量级ORM工具（Github），Dapper语法十分简单。并且无须迁就数据库的设计，今天通过本文给大家介绍C# Dapper的使用，感兴趣的朋友一起看看吧
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
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