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C#使用SqlSuger如何通过优化代码，提高查询效率

1.Sqlsuger是什么SqlSugar是一款来自未来的ORM，拥有超前的理念，需求领跑第一线，可以毫不夸张的说，在设计理念上就算不更新几年都不会过时，我们每天都会跟踪用户需求，将这些用户需求分类和整理，把有共性的功能都整理出来，经历过长达7年的努力，需求成负增长，已经走向了成熟和完善，是一款真正用了功能齐全的ORM框架,如果你用过EF CORE或者DAPPER肯定会为功能缺失而无奈，该有的功能没有，花里胡哨的一大堆。如果你用SqlSugar，会给你一个不错的选择，不断给你惊喜。（这是官方解释），2.Sqlsuger的优点1.&nbsp; .NET中唯一【全自动分表组件】+【读写分离】+【SAAS分库】+【大数据读写】官方完美整合的ORM框架2.&nbsp; .NET 百万级大数据写入、更新和读取&nbsp; 性能最强框架3.&nbsp; 使用最简单，语法最爽的ORM 【文档，视频教程】4.&nbsp; 支持 DbFirst、CodeFirst和WebFirst 3种模式开发5.Github star数仅次于EF 和 Dapper,每月nuget下载量超过1万更多优点：简单易用、功能齐全、高性能、轻量级、服务齐全、官网教程文档、有专业技术支持一天18小时服务支持数据库：MySql、SqlServer、Sqlite、Oracle 、 postgresql、达梦、人大金仓、神通数据库、Access 、MySqlConnector、自定义扩展二、使用步骤1.引入Sqlsuger1. 创建 .Net工程小编使用的是最新版的Visual Studio 2022，创建了一个基于.NET Framework的控制台应用程序。Sqlite数据库也提前用Navicat 工具创建好了。2. 引入Sqlsuger接下来便是在工程中引入Sqlsuger的dll文件，Visual Studio引入文件也很方便。使用NuGet 包管理器，在浏览中搜索 SqlSugar 点击安装即可（需要注意的是小编创建的项目是基于）.NET Framework的控制台程序，所以下载的时候安装了支持.NET Framework版本的Sqlsuger，如果你创建的项目是其他的，比如 .NET Core 就要安装相对应的Sqlsuger&nbsp;安装好了之后在Program.cs中引入Sqlsuger代码如下（示例）：using SqlSugar;2.操作Sqlite数据库1. 创建数据库表实例首先尝试的通过Sqlsuger创建Sqlite数据库中表的实例，代码如下using SqlSugar;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApp1{&nbsp; &nbsp; internal class Program&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; static void Main(string[] args)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ConnectionConfig connectionConfig = new ConnectionConfig();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; connectionConfig.DbType = DbType.Sqlite;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; connectionConfig.ConnectionString = @"Data Source=D:\sqlsuger\wxa7795cfeb64842e2\wechatsetting.db;Version=3";&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; using (SqlSugarClient sugarClient = new SqlSugarClient(connectionConfig))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sugarClient.DbFirst.CreateClassFile(@"D:\sqlsuger\新建文件夹\ConsoleApp1\dbModels\");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}需要创建SqlSugarClient对象，创建时需要ConnectionConfig参数，创建ConnectionConfig参数时有两个主要的字段，connectionConfig.DbType = DbType.Sqlite;//你要操作的数据库类型，这里选择的时Sqlite数据库connectionConfig.ConnectionString&nbsp; = "数据库连接字符串"//想要连接的数据库连接字符在SqlSugarClient对象中有DbFirst.CreateClassFile方法，它的参数是你要生成的数据库表实体类的存放地址，初次运行上述文件时会报错，无法找到System.Data.SQLite.dll相关依赖等错误，这是因为Sqlsuger操作Sqlite数据库时用到了System.Data.SQLite.dll，和Newtonsoft.Json 安装完这两个包之后运行上面的代码在对应的文件夹下便会生成表的实体类，2. 增删改查的操作小编写了最简单的几个操作，Sqlsuger能实现的操作远不止这些，增删改查操作直接上代码：using Models;using SqlSugar;using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;&nbsp;namespace ConsoleApp1{&nbsp; &nbsp; internal class Program&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; static void Main(string[] args)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ConnectionConfig connectionConfig = new ConnectionConfig();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; connectionConfig.DbType = DbType.Sqlite;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; connectionConfig.ConnectionString = @"Data Source=D:\sqlsuger\wxa7795cfeb64842e2\wechatsetting.db;Version=3";&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; using (SqlSugarClient sugarClient = new SqlSugarClient(connectionConfig))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //sugarClient.DbFirst.CreateClassFile(@"D:\sqlsuger\新建文件夹\ConsoleApp1\dbModels\");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //插入的操作&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WDB_Template wDB = new WDB_Template()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; id = 4,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; content = "测试",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; isuse = 0&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; };&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sugarClient.Insertable&lt;WDB_Template&gt;(wDB).ExecuteCommand();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WDB_Template wDB_Template0 = sugarClient.Queryable&lt;WDB_Template&gt;().First();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print(wDB_Template0);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //查询的操作&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WDB_Template wDB_Template1 = sugarClient.Queryable&lt;WDB_Template&gt;().First();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print(wDB_Template1);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //更新的操作&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; wDB.content = wDB.content + "更新后";&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sugarClient.Updateable&lt;WDB_Template&gt;(wDB).WhereColumns(it =&gt; new { it.id }).ExecuteCommand();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WDB_Template wDB_Template2 = sugarClient.Queryable&lt;WDB_Template&gt;().First();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print(wDB_Template2);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; //删除的操作&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sugarClient.Deleteable&lt;WDB_Template&gt;().In(it =&gt; it.id, 4).ExecuteCommand();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; WDB_Template wDB_Template3 = sugarClient.Queryable&lt;WDB_Template&gt;().First();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; print(wDB_Template3);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.ReadLine();&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; public static void print(WDB_Template wDB)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; if (wDB == null)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine("数据库中没有数据");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Console.WriteLine($"id = {wDB.id} ---- content = {wDB.content} ---- isuse = {wDB.isuse}");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }}下面是Sqlsuger的官网大家感兴趣可以继续探究：&nbsp;https://www.donet5.com/Home/Doc

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