C# Dapper的使用

本文轉載自查看原文 2021-01-08 17:21 1777 .NET

一、什么是Dapper

　　Dapper是一款輕量級ORM工具（Github）。如果你在小的項目中，使用Entity Framework、NHibernate 來處理大數據訪問及關系映射，未免有點殺雞用牛刀。你又覺得ORM省時省力，這時Dapper 將是你不二的選擇。

二、Dapper的優點

輕量。只有一個文件SqlMapper.cs，編譯后就40K的一個很小的Dll.
速度快。Dapper的速度接近與IDataReader，取列表的數據超過了DataTable。
支持多種數據庫。Dapper可以在所有Ado.net Providers下工作，包括sqlite, sqlce, firebird, oracle, MySQL, PostgreSQL and SQL Server
可以映射一對一，一對多，多對多等多種關系。
性能高。通過Emit反射IDataReader的序列隊列，來快速的得到和產生對象，性能不錯。
支持FrameWork2.0，3.0，3.5，4.0，4.5
Dapper語法十分簡單。並且無須遷就數據庫的設計。

三、使用方法

　　1、添加NuGet程序包Dapper

　　2、配置文件添加連接數據庫的字符串

<?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、刪除、批量刪除、修改、批量修改、查詢、查詢in的操作、多語句操作)

// <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">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <param name="t">傳入實體類型.</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">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <param name="t">傳入泛型類.</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>
        /// 刪除.
        /// </summary>
        /// <typeparam name="T">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <param name="t">傳入實體類型.</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>
        /// 批量刪除.
        /// </summary>
        /// <typeparam name="T">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <param name="t">傳入泛型類.</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">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <param name="t">傳入實體類型.</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">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <param name="t">傳入泛型類.</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>
        /// 查詢.
        /// </summary>
        /// <typeparam name="T">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <returns>泛型類.</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>
        /// 查詢指定數據.
        /// </summary>
        /// <typeparam name="T">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <param name="t">傳入泛型類.</param>
        /// <returns>類.</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>
        /// 查詢的in操作.
        /// </summary>
        /// <typeparam name="T">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</param>
        /// <returns>泛型類.</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>
        /// 多語句操作.
        /// </summary>
        /// <typeparam name="T">實體類型.</typeparam>
        /// <param name="sql">傳入sql執行語句.</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、添加測試類Student.cs、UserInfo。表數據自己添加

    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、調用方法

//-----------------------------------------------------------------------
// <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 = "這是備注";
            // 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 = "這是備注";
            // user.CreateTime = DateTime.Now;

            // UserInfo user2 = new UserInfo();
            // user2.Name = "梁山伯";
            // user2.Age = 54;
            // user2.Memo = "這是備注";
            // 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();
            // }

            // --------------刪除--------------
            // 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("刪除成功");
            //     Console.ReadKey();
            // }

            // --------------批量刪除--------------
            // 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();
            // }

            // --------------查詢--------------
            // 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();

            // --------------查詢指定數據--------------
            // 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();

            // --------------查詢的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);
            // }

            // --------------多語句操作--------------
            // string sql = "select * from userinfo;select * from student";

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

　　6、通用分頁

　/// <summary>
        /// dapper通用分頁方法
        /// </summary>
        /// <typeparam name="T">泛型集合實體類</typeparam>
        /// <param name="conn">數據庫連接池連接對象</param>
        /// <param name="files">列</param>
        /// <param name="tableName">表</param>
        /// <param name="where">條件</param>
        /// <param name="orderby">排序</param>
        /// <param name="pageIndex">當前頁</param>
        /// <param name="pageSize">當前頁顯示條數</param>
        /// <param name="total">結果集總數</param>
        /// <returns></returns>
        public static IEnumerable<T> GetPageList<T>(IDbConnection conn, string files, string tableName, string where, string orderby, int pageIndex, int pageSize, out int total)
        {
            int skip = 1;
            if (pageIndex > 0)
            {
                skip = (pageIndex - 1) * pageSize + 1;
            }
            StringBuilder sb = new StringBuilder();
            sb.AppendFormat("SELECT COUNT(1) FROM {0} where {1};", tableName, where);
            sb.AppendFormat(@"SELECT  {0}
                                FROM(SELECT ROW_NUMBER() OVER(ORDER BY {3}) AS RowNum,{0}
                                          FROM  {1}
                                          WHERE {2}
                                        ) AS result
                                WHERE  RowNum >= {4}   AND RowNum <= {5}
                                ORDER BY {3}", files, tableName, where, orderby, skip, pageIndex * pageSize);
            using (var reader = conn.QueryMultiple(sb.ToString()))
            {
                total = reader.ReadFirst<int>();
                return reader.Read<T>();
            }
        }

源代碼：

鏈接：https://pan.baidu.com/s/17vGohi7Ng-xwoghKL0IMLw
提取碼：wm0s

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