嘛尼嘛尼哄 发表于 2024-1-20 10:23:40

SqlSugar入门

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1705386952867","name":"code-line","data":{},"nodes":[{"type":"text","id":"tjoK-1705386952866","leaves":[{"text":"     ","marks":[]}]}]},{"type":"block","id":"gW54-1705386952869","name":"code-line","data":{},"nodes":[{"type":"text","id":"ITtx-1705386952868","leaves":[{"text":"     //插入","marks":[]}]}]},{"type":"block","id":"p3te-1705386952871","name":"code-line","data":{},"nodes":[{"type":"text","id":"wnWe-1705386952870","leaves":[{"text":"     db.Insertable(new Student() { SchoolId = 1, Name = \"jack\" }).ExecuteCommand();","marks":[]}]}]},{"type":"block","id":"SoLB-1705386952873","name":"code-line","data":{},"nodes":[{"type":"text","id":"V2oH-1705386952872","leaves":[{"text":"     ","marks":[]}]}]},{"type":"block","id":"mocN-1705386952875","name":"code-line","data":{},"nodes":[{"type":"text","id":"Oe3D-1705386952874","leaves":[{"text":"     //更新","marks":[]}]}]},{"type":"block","id":"RIXw-1705386952877","name":"code-line","data":{},"nodes":[{"type":"text","id":"CgPZ-1705386952876","leaves":[{"text":"     db.Updateable(new Student() { Id = 1, SchoolId = 2, Name = \"jack2\" }).ExecuteCommand();","marks":[]}]}]},{"type":"block","id":"vXu3-1705386952879","name":"code-line","data":{},"nodes":[{"type":"text","id":"JyHO-1705386952878","leaves":[{"text":"     ","marks":[]}]}]},{"type":"block","id":"ciLF-1705386952881","name":"code-line","data":{},"nodes":[{"type":"text","id":"7tB0-1705386952880","leaves":[{"text":"     //删除","marks":[]}]}]},{"type":"block","id":"cn8n-1705386952883","name":"code-line","data":{},"nodes":[{"type":"text","id":"jPSL-1705386952882","leaves":[{"text":"     db.Deleteable().Where(it => it.Id == 1).ExecuteCommand();","marks":[]}]}]},{"type":"block","id":"e8XW-1705386952885","name":"code-line","data":{},"nodes":[{"type":"text","id":"t7Wp-1705386952884","leaves":[{"text":"","marks":[]}]}]},{"type":"block","id":"F5KJ-1705386952887","name":"code-line","data":{},"nodes":[{"type":"text","id":"Dx2H-1705386952886","leaves":[{"text":"     }","marks":[]}]}]},{"type":"block","id":"CyIl-1705386952889","name":"code-line","data":{},"nodes":[{"type":"text","id":"sxSD-1705386952888","leaves":[{"text":"","marks":[]}]}]},{"type":"block","id":"Bdhn-1705386952891","name":"code-line","data":{},"nodes":[{"type":"text","id":"N4xE-1705386952890","leaves":[{"text":"       ","marks":[]}]}]},{"type":"block","id":"MHNr-1705386952893","name":"code-line","data":{},"nodes":[{"type":"text","id":"9qeH-1705386952892","leaves":[{"text":"","marks":[]}]}]},{"type":"block","id":"fCDU-1705386952895","name":"code-line","data":{},"nodes":[{"type":"text","id":"A3eV-1705386952894","leaves":[{"text":"    //实体与数据库结构一样","marks":[]}]}]},{"type":"block","id":"bJS9-1705386952897","name":"code-line","data":{},"nodes":[{"type":"text","id":"gu3A-1705386952896","leaves":[{"text":"    public class Student","marks":[]}]}]},{"type":"block","id":"wY6p-1705386952899","name":"code-line","data":{},"nodes":[{"type":"text","id":"alIu-1705386952898","leaves":[{"text":"    {","marks":[]}]}]},{"type":"block","id":"HGXG-1705386952902","name":"code-line","data":{},"nodes":[{"type":"text","id":"kFt4-1705386952901","leaves":[{"text":"     //数据是自增需要加上IsIdentity ","marks":[]}]}]},{"type":"block","id":"j5hN-1705386952904","name":"code-line","data":{},"nodes":[{"type":"text","id":"cIPR-1705386952903","leaves":[{"text":"     //数据库是主键需要加上IsPrimaryKey ","marks":[]}]}]},{"type":"block","id":"5Xy5-1705386952906","name":"code-line","data":{},"nodes":[{"type":"text","id":"20gM-1705386952905","leaves":[{"text":"     //注意:要完全和数据库一致2个属性","marks":[]}]}]},{"type":"block","id":"PEAH-1705386952908","name":"code-line","data":{},"nodes":[{"type":"text","id":"101U-1705386952907","leaves":[{"text":"     ","marks":[]}]}]},{"type":"block","id":"MUzw-1705386952910","name":"code-line","data":{},"nodes":[{"type":"text","id":"vsNe-1705386952909","leaves":[{"text":"     public int Id { get; set; }","marks":[]}]}]},{"type":"block","id":"zM7B-1705386952912","name":"code-line","data":{},"nodes":[{"type":"text","id":"L50h-1705386952911","leaves":[{"text":"     public int? SchoolId { get; set; }","marks":[]}]}]},{"type":"block","id":"wgDp-1705386952914","name":"code-line","data":{},"nodes":[{"type":"text","id":"cPQG-1705386952913","leaves":[{"text":"     public string Name { get; set; }","marks":[]}]}]},{"type":"block","id":"iek6-1705386952916","name":"code-line","data":{},"nodes":[{"type":"text","id":"hojr-1705386952915","leaves":[{"text":"     }","marks":[]}]}]}]},{"type":"block","id":"MpDP-1705386952919","name":"heading","data":{"level":"h3"},"nodes":[{"type":"text","id":"rPpP-1705386952918","leaves":[{"text":"1.2 偶发错误","marks":[]}]}]},{"type":"block","id":"D70B-1705386952921","name":"paragraph","data":{},"nodes":[{"type":"text","id":"JewY-1705386952920","leaves":[{"text":" SqlSugarClient ","marks":[{"type":"color","value":"#ff0000"},{"type":"backgroundColor","value":"rgb(255, 255, 255)"},{"type":"fontSize","value":14},{"type":"fontFamily","value":"Arial"}]},{"text":"出现偶发","marks":[{"type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de-line","data":{},"nodes":[{"type":"text","id":"RnOL-1705386953455","leaves":[{"text":"           db=>{  ","marks":[]}]}]},{"type":"block","id":"hlxA-1705386953458","name":"code-line","data":{},"nodes":[{"type":"text","id":"VCyH-1705386953457","leaves":[{"text":"                    //也可以这里面循环","marks":[]}]}]},{"type":"block","id":"M1vO-1705386953460","name":"code-line","data":{},"nodes":[{"type":"text","id":"FS9A-1705386953459","leaves":[{"text":"                   db.GetConnection(\"1\").Aop.OnLogExecuting = (sql, pars) =>","marks":[]}]}]},{"type":"block","id":"wXYD-1705386953462","name":"code-line","data":{},"nodes":[{"type":"text","id":"lSZx-1705386953461","leaves":[{"text":"                   {","marks":[]}]}]},{"type":"block","id":"lfFT-1705386953464","name":"code-line","data":{},"nodes":[{"type":"text","id":"hath-1705386953463","leaves":[{"text":"                     Console.WriteLine(\"执行1库\"+sql);","marks":[]}]}]},{"type":"block","id":"OZjs-1705386953466","name":"code-line","data":{},"nodes":[{"type":"text","id":"gVbX-1705386953465","leaves":[{"text":"                   };","marks":[]}]}]},{"type":"block","id":"E4JA-1705386953468","name":"code-line","data":{},"nodes":[{"type":"text","id":"SC1e-1705386953467","leaves":[{"text":"                   db.GetConnection(\"0\").Aop.OnLogExecuting = (sql, pars) =>","marks":[]}]}]},{"type":"block","id":"0XrS-1705386953470","name":"code-line","data":{},"nodes":[{"type":"text","id":"p3Lv-1705386953469","leaves":[{"text":"                   {","marks":[]}]}]},{"type":"block","id":"fSud-1705386953473","name":"code-line","data":{},"nodes":[{"type":"text","id":"ZYw9-1705386953472","leaves":[{"text":"                      Console.WriteLine(\"执行0库\"+sql);","marks":[]}]}]},{"type":"block","id":"hW1c-1705386953475","name":"code-line","data":{},"nodes":[{"type":"text","id":"IbEw-1705386953474","leaves":[{"text":"                   };","marks":[]}]}]},{"type":"block","id":"Su64-1705386953477","name":"code-line","data":{},"nodes":[{"type":"text","id":"UHQt-1705386953476","leaves":[{"text":" ","marks":[]}]}]},{"type":"block","id":"m0M4-1705386953479","name":"code-line","data":{},"nodes":[{"type":"text","id":"akdL-1705386953478","leaves":[{"text":"  });","marks":[]}]}]}]},{"type":"block","id":"GhPS-1705386953482","name":"paragraph","data":{},"nodes":[{"type":"text","id":"Zv2p-1705386953481","leaves":[{"text":"","marks":[]}]}]},{"type":"block","id":"gOaM-1705386953484","name":"heading","data":{"level":"h2"},"nodes":[{"type":"text","id":"bJ9C-1705386953483","leaves":[{"text":"国际化","marks":[]}]}]},{"type":"block","id":"CTrK-1705386953486","name":"paragraph","data":{},"nodes":[{"type":"text","id":"hUVb-1705386953485","leaves":[{"text":"错误提示可以设置相应的语言","marks":[]}]}]},{"type":"block","id":"xtt8-1705386953488","name":"paragraph","data":{},"nodes":[{"type":"text","id":"2q3N-1705386953487","leaves":[{"text":"1.枚举说明","marks":[]}]}]},{"type":"block","id":"yCjf-1705386953501","name":"code","data":{"language":"","theme":"default"},"nodes":[{"type":"block","id":"wS41-1705386953490","name":"code-line","data":{},"nodes":[{"type":"text","id":"71AQ-1705386953489","leaves":[{"text":"    public enum LanguageType","marks":[]}]}]},{"type":"block","id":"c3bv-1705386953492","name":"code-line","data":{},"nodes":[{"type":"text","id":"fpfi-1705386953491","leaves":[{"text":"    {","marks":[]}]}]},{"type":"block","id":"40m3-1705386953494","name":"code-line","data":{},"nodes":[{"type":"text","id":"F9wM-1705386953493","leaves":[{"text":"        Default=0, //中&英","marks":[]}]}]},{"type":"block","id":"b9Ip-1705386953496","name":"code-line","data":{},"nodes":[{"type":"text","id":"Hqh8-1705386953495","leaves":[{"text":"        Chinese=1, //处理过的异常尽量中文,未处理的还是英文","marks":[]}]}]},{"type":"block","id":"ndL4-1705386953498","name":"code-line","data":{},"nodes":[{"type":"text","id":"GwlJ-1705386953497","leaves":[{"text":"        English=2 //全部英文","marks":[]}]}]},{"type":"block","id":"mBQU-1705386953500","name":"code-line","data":{},"nodes":[{"type":"text","id":"OYRc-1705386953499","leaves":[{"text":"    }","marks":[]}]}]}]},{"type":"block","id":"ycfr-1705386953503","name":"paragraph","data":{},"nodes":[{"type":"text","id":"bYFF-1705386953502","leaves":[{"text":"2.用例 ","marks":[]}]}]},{"type":"block","id":"beHq-1705386953518","name":"code","data":{"language":"","theme":"default"},"nodes":[{"type":"block","id":"fB58-1705386953505","name":"code-line","data":{},"nodes":[{"type":"text","id":"knLE-1705386953504","leaves":[{"text":"  SqlSugarClient db = new SqlSugarClient(new ConnectionConfig()","marks":[]}]}]},{"type":"block","id":"9wny-1705386953507","name":"code-line","data":{},"nodes":[{"type":"text","id":"akNC-1705386953506","leaves":[{"text":"  {","marks":[]}]}]},{"type":"block","id":"wvcJ-1705386953509","name":"code-line","data":{},"nodes":[{"type":"text","id":"63Um-1705386953508","leaves":[{"text":"                ConnectionString = Config.ConnectionString,","marks":[]}]}]},{"type":"block","id":"B57m-1705386953511","name":"code-line","data":{},"nodes":[{"type":"text","id":"QowU-1705386953510","leaves":[{"text":"                DbType = DbType.SqlServer,","marks":[]}]}]},{"type":"block","id":"eYLL-1705386953513","name":"code-line","data":{},"nodes":[{"type":"text","id":"RSsX-1705386953512","leaves":[{"text":"                LanguageType=LanguageType.English,//只显示英文","marks":[]}]}]},{"type":"block","id":"VgH0-1705386953515","name":"code-line","data":{},"nodes":[{"type":"text","id":"VqYY-1705386953514","leaves":[{"text":"                IsAutoCloseConnection = true ","marks":[]}]}]},{"type":"block","id":"V7OY-1705386953517","name":"code-line","data":{},"nodes":[{"type":"text","id":"POjd-1705386953516","leaves":[{"text":"   });","marks":[]}]}]}]},{"type":"block","id":"J62n-1705386953520","name":"paragraph","data":{},"nodes":[{"type":"text","id":"TABs-1705386953519","leaves":[{"text":"","marks":[]}]}]},{"type":"block","id":"lxYy-1705386953522","name":"heading","data":{"level":"h2"},"nodes":[{"type":"text","id":"djSc-1705386953521","leaves":[{"text":"长连接用法(3种方式)","marks":[]}]}]},{"type":"block","id":"Q66x-1705386953524","name":"paragraph","data":{},"nodes":[{"type":"text","id":"LQh3-1705386953523","leaves":[{"text":"1.事务中是长连接","marks":[]}]}]},{"type":"block","id":"nd55-1705386953526","name":"paragraph","data":{},"nodes":[{"type":"text","id":"z5cw-1705386953525","leaves":[{"text":"2.手动释放模式是长连接(不推荐需要手动释放)","marks":[]}]}]},{"type":"block","id":"sPUR-1705386953528","name":"paragraph","data":{},"nodes":[{"type":"text","id":"SSGg-1705386953527","leaves":[{"text":"3.自动释放中 不使用事务我们可以用OpenAlways实现长连接","marks":[]}]}]},{"type":"block","id":"74fW-1705386953545","name":"code","data":{"language":"","theme":"default"},"nodes":[{"type":"block","id":"6m5e-1705386953530","name":"code-line","data":{},"nodes":[{"type":"text","id":"PV0h-1705386953529","leaves":[{"text":" //5.0.6.3","marks":[]}]}]},{"type":"block","id":"wNFx-1705386953532","name":"code-line","data":{},"nodes":[{"type":"text","id":"wQ1I-1705386953531","leaves":[{"text":" using (db.Ado.OpenAlways()) {","marks":[]}]}]},{"type":"block","id":"WBhQ-1705386953534","name":"code-line","data":{},"nodes":[{"type":"text","id":"39F6-1705386953533","leaves":[{"text":"    ","marks":[]}]}]},{"type":"block","id":"94za-1705386953536","name":"code-line","data":{},"nodes":[{"type":"text","id":"GvSi-1705386953535","leaves":[{"text":"     db.Queryable...","marks":[]}]}]},{"type":"block","id":"xNlM-1705386953538","name":"code-line","data":{},"nodes":[{"type":"text","id":"bAV1-1705386953537","leaves":[{"text":"     db.Insertable...","marks":[]}]}]},{"type":"block","id":"obid-1705386953540","name":"code-line","data":{},"nodes":[{"type":"text","id":"rncq-1705386953539","leaves":[{"text":"     //比如当前会话生效的临时表就需要长连接,不然创建了访问不了","marks":[]}]}]},{"type":"block","id":"fixr-1705386953542","name":"code-line","data":{},"nodes":[{"type":"text","id":"z9A7-1705386953541","leaves":[{"text":"            ","marks":[]}]}]},{"type":"block","id":"j6Xp-1705386953544","name":"code-line","data":{},"nodes":[{"type":"text","id":"afPf-1705386953543","leaves":[{"text":" }","marks":[]}]}]}]},{"type":"block","id":"rf1H-1705386953547","name":"paragraph","data":{},"nodes":[{"type":"text","id":"lIYF-1705386953546","leaves":[{"text":"","marks":[]}]}]},{"type":"block","id":"qWcJ-1705386953549","name":"heading","data":{"level":"h2"},"nodes":[{"type":"text","id":"gZgq-1705386953548","leaves":[{"text":"配置最小时间","marks":[]}]}]},{"type":"block","id":"6MhI-1705386953551","name":"paragraph","data":{},"nodes":[{"type":"text","id":"CMDi-1705386953550","leaves":[{"text":"新功能:5.0.8.1","marks":[{"type":"color","value":"#ff0000"}]}]}]},{"type":"block","id":"Cp3n-1705386953553","name":"paragraph","data":{},"nodes":[{"type":"text","id":"LpyB-1705386953552","leaves":[{"text":"推荐用默认的,这样多种数据库使用不报错,当然你也可以强制设置","marks":[]}]}]},{"type":"block","id":"2iOy-1705386953562","name":"code","data":{"language":"","theme":"default"},"nodes":[{"type":"block","id":"66hf-1705386953555","name":"code-line","data":{},"nodes":[{"type":"text","id":"06Ca-1705386953554","leaves":[{"text":" db.CurrentConnectionConfig.MoreSettings = new ConnMoreSettings","marks":[]}]}]},{"type":"block","id":"TbYE-1705386953557","name":"code-line","data":{},"nodes":[{"type":"text","id":"uv1Y-1705386953556","leaves":[{"text":"  {","marks":[]}]}]},{"type":"block","id":"tuxh-1705386953559","name":"code-line","data":{},"nodes":[{"type":"text","id":"nlMo-1705386953558","leaves":[{"text":"        DbMinDate = DateTime.MinValue//默认最小时间是 1900-01-01 00:00:00.000 ","marks":[]}]}]},{"type":"block","id":"6SNU-1705386953561","name":"code-line","data":{},"nodes":[{"type":"text","id":"I3ZW-1705386953560","leaves":[{"text":"   };","marks":[]}]}]}]},{"type":"block","id":"SqWr-1705386953564","name":"paragraph","data":{},"nodes":[{"type":"text","id":"Mzm9-1705386953563","leaves":[{"text":"                    ","marks":[]}]}]}]">SqlSugar入门

创建对象

你可以使用 SqlSugarClient (new模式)或者 SqlSugarScope (单例) 对数据库进行增、删、查、改等功能注意:除了名字和使用模式不同,功能和API都一模一样SqlSugarClient(new模式)优点:性能比SqlSugarScope有5%左右提升缺点: db不能跨上下文使用,需要new出一个新对象(EF和Dapper一样),偶发错误难排查适合有经验用户 模式:不能单例,因为他不是线程安全对象SqlSugarScope (单例模式)5.0.3.4特色功能 如果没有.NET 开发经验的推荐使用 SqlSugarScope能够解决大部分线程安全问题。 原理是用的AsyncLocal异步上下文的不同来实现的线程安全。 注意:同一个异步上下文进行并发操作AsyncLocal也不能保证线程安, 下面3种情况 1.第三方Job  (必须将db改成db.CopyNew()) 2.Task.WhenAll  、ForAsync 、ParallelAsync (必须将db改成db.CopyNew()) 3. 异步漏写await 或者 方法不是Task类型或者Func(Void(方法) Action(表达式)(推荐修改错误代码 , 如果就是不想修改也是可以db.CopyNew()解决)  模式: 单例模式   SqlSugarScope一直new会内存泄露 一定要用单例  1、Scope模式:SqlSugarClient  

注意非单例模式用的是SqlSugarClient , 禁止用SqlSugarScope1.1 完整用例

SqlSugarClient 每次请求new一个新对象,db禁止跨上下文使用,IOC建议用Scope或者瞬发注入    //查询所有
    public static void Demo()
    {
   
   //创建数据库对象 (用法和EF Dappper一样通过new保证线程安全)
   SqlSugarClient Db= new SqlSugarClient(new ConnectionConfig(){
         ConnectionString = "连接符字串",
         DbType = DbType.SqlServer,
         IsAutoCloseConnection = true},
         db=>{
               //5.1.3.24统一了语法和SqlSugarScope一样,老版本AOP可以写外面
               
                  db.Aop.OnLogExecuting = (sql, pars) =>
                  {
                  Console.WriteLine(sql);//输出sql,查看执行sql 性能无影响
                  
                  
                  //获取原生SQL推荐 5.1.4.63性能OK
                     Console.WriteLine(UtilMethods.GetNativeSql(sql,pars))
                              
                  //获取无参数化SQL 对性能有影响,特别大的SQL参数多的,调试使用
                  //UtilMethods.GetSqlString(DbType.SqlServer,sql,pars)
                     
                  
                   };
                  
                   //注意多租户 有几个设置几个
                   //db.GetConnection(i).Aop
         
         });
   
   //建表
   //db.CodeFirst.InitTables<Student>(); 更多看文档迁移      
         
   //查询表的所有
   var list = db.Queryable<Student>().ToList();
   
   //插入
   db.Insertable(new Student() { SchoolId = 1, Name = "jack" }).ExecuteCommand();
   
   //更新
   db.Updateable(new Student() { Id = 1, SchoolId = 2, Name = "jack2" }).ExecuteCommand();
   
   //删除
   db.Deleteable<Student>().Where(it => it.Id == 1).ExecuteCommand();

   }

      

    //实体与数据库结构一样
    public class Student
    {
   //数据是自增需要加上IsIdentity
   //数据库是主键需要加上IsPrimaryKey
   //注意:要完全和数据库一致2个属性
   
   public int Id { get; set; }
   public int? SchoolId { get; set; }
   public string Name { get; set; }
   }1.2 偶发错误

 SqlSugarClient 出现偶发错误全部换成SqlSugarScope进行测试,如果换了不报错了那么证明就是线程安全问题,你也可以直接使用SqlSugarScope因为他是线程安全的 ,用SqlSugarScope要改成单例不然会有内存增加风险详情:https://www.donet5.com/Home/Doc?typeId=1224 1.3  AddScope IOC

Scope我们需要用SqlSugarClient//注册上下文:AOP里面可以获取IOC对象,如果有现成框架比如Furion可以不写这一行
services.AddHttpContextAccessor();
//注册SqlSugar用AddScoped
services.AddScoped<ISqlSugarClient>(s =>
{
      //Scoped用SqlSugarClient
    SqlSugarClient sqlSugar = new SqlSugarClient (new ConnectionConfig()
    {
      DbType = SqlSugar.DbType.Sqlite,
      ConnectionString = "DataSource=sqlsugar-dev.db",
      IsAutoCloseConnection = true,
    },
   db =>
   {
      //每次上下文都会执行
         
      //获取IOC对象不要求在一个上下文
      //vra log=s.GetService<Log>()
               
      //获取IOC对象要求在一个上下文
      //var appServive = s.GetService<IHttpContextAccessor>();
      //var log= appServive?.HttpContext?.RequestServices.GetService<Log>();
               
       db.Aop.OnLogExecuting = (sql, pars) =>
       {
      
       };
   });
    return sqlSugar;
});


//用接口接收
public class(ISqlSugarClientdb) 2、单例模式:SqlSugarScope 

2.1 完整用例

SqlSugarScope 请使用单例模式,配置参数有2种周期(A):全局生效(B):   当前上下文生效 publicclassSqlSugarHelper //不能是泛型类
{

    //多库情况下使用说明:
    //如果是固定多库可以传 new SqlSugarScope(List<ConnectionConfig>,db=>{}) 文档:多租户
    //如果是不固定多库 可以看文档Saas分库
   
   
   //用单例模式
    public static SqlSugarScope Db= new SqlSugarScope(new ConnectionConfig()
   {
            ConnectionString = "Server=.xxxxx",//连接符字串
            DbType = DbType.SqlServer,//数据库类型
            IsAutoCloseConnection = true //不设成true要手动close
   },
db=> {
         //(A)全局生效配置点,一般AOP和程序启动的配置扔这里面 ,所有上下文生效
         //调试SQL事件,可以删掉
         db.Aop.OnLogExecuting = (sql, pars) =>
         {
          Console.WriteLine(sql);//输出sql,查看执行sql 性能无影响
         
         //获取原生SQL推荐 5.1.4.63性能OK
         //UtilMethods.GetNativeSql(sql,pars)
                              
         //获取无参数化SQL 对性能有影响,特别大的SQL参数多的,调试使用
         //UtilMethods.GetSqlString(DbType.SqlServer,sql,pars)
                  
         };
         
         //多个配置就写下面
         //db.Ado.IsDisableMasterSlaveSeparation=true;
         
          //注意多租户 有几个设置几个
          //db.GetConnection(i).Aop
   });
   }
   //(B)当前上下文生效配置点,一般多租户相关操作写在这儿
   //db.GetConnectionxxx 只在当前上下文有效,不会共享
   //如果是程序启动时的配置全部到A里面去

   //建表
//db.CodeFirst.InitTables<Student>(); 更多看文档迁移   

//查询表的所有
var list=SqlSugarHelper.Db.Queryable<Student>().ToList();
   
//插入
SqlSugarHelper.Db.Insertable(new Student(){ SchoolId = 1, Name = "jack" }).ExecuteCommand();
   
//更新
SqlSugarHelper.Db.Updateable(new Student(){ Id = 1,SchoolId=2,Name="jack2" }).ExecuteCommand();
   
//删除
SqlSugarHelper.Db.Deleteable<Student>().Where(it => it.Id == 1).ExecuteCommand();


   //实体与数据库结构一样
   public class Student
   {
   //数据是自增需要加上IsIdentity
   //数据库是主键需要加上IsPrimaryKey
   //注意:要完全和数据库一致2个属性
   
   public int Id { get; set; }
   public int? SchoolId { get; set; }
   public string Name { get; set; }
   }验证单例是否成功:SqlSugarHelper.Db.HasCode();//只要看这个hascode在服务启动后都一个那么说明成功了 //IOC直接复制我的DEMO就不需要验证2.2 偶发错误 

详情:https://www.donet5.com/Home/Doc?typeId=12242.3 原理

https://www.donet5.com/Home/Doc?typeId=23522.4  AddSingleton IOC

//注册上下文:AOP里面可以获取IOC对象,如果有现成框架比如Furion可以不写这一行
services.AddHttpContextAccessor();
//注册SqlSugar
services.AddSingleton<ISqlSugarClient>(s =>
{
    SqlSugarScope sqlSugar = new SqlSugarScope(new ConnectionConfig()
    {
      DbType = SqlSugar.DbType.Sqlite,
      ConnectionString = "DataSource=sqlsugar-dev.db",
      IsAutoCloseConnection = true,
    },
   db =>
   {         
      //每次上下文都会执行
         
      //获取IOC对象不要求在一个上下文
      //vra log=s.GetService<Log>()
               
      //获取IOC对象要求在一个上下文
      //var appServive = s.GetService<IHttpContextAccessor>();
      //var log= appServive?.HttpContext?.RequestServices.GetService<Log>();
               
       db.Aop.OnLogExecuting = (sql, pars) =>
       {
      
       };
   });
    return sqlSugar;
});

//用接口接收
public class(ISqlSugarClientdb) 多库用法 

var db = new SqlSugarClient(new List<ConnectionConfig>()
{
new ConnectionConfig(){ConfigId="0",DbType=DbType.SqlServer,ConnectionString=..,IsAutoCloseConnection=true},
new ConnectionConfig(){ConfigId="1",DbType=DbType.MySql,ConnectionString=..,IsAutoCloseConnection=true}
});
var childA=db.GetConnection("A");
var childB=db.GetConnection("B");详细教程:https://www.donet5.com/Home/Doc?typeId=2246 连接参数SqlSugarClient是通过ConnectionConfig进行传参数详细参数如下名称描述必填DbType数据库类型是ConnectionString连接字符串是IsAutoCloseConnection自动释放和关闭数据库连接,如果有事务事务结束时关闭,否则每次操作后关闭 ConfigureExternalServices一些扩展层务的集成 MoreSettings

[*]点击查看
 SlaveConnectionConfigs主从设置 LanguageType提示错误可以设置语言  设置超时设置超时时间//Sql超时
db.Ado.CommandTimeOut = 30;//单位秒

//db.Open 连接超时
//在连接池符串加上 Connection Timeout=10,默认是30秒,单位秒  验证连接是否成功(数据库连接成功)版本要求:5.0.6.5 preview05 +db.Ado.IsValidConnection()//如果时间长,可以在连接字符串配置 连接超时时间

//上面写法如果写到事务中会影响事务
//事务中我会可以new一个新对象处理
db.CopyNew().Ado.IsValidConnection()
// 数据库连接成功 打印SQL 

单库sql打印

 
SqlSugarClient Db= new SqlSugarClient(new ConnectionConfig(){
         ConnectionString = "连接符字串",
         DbType = DbType.SqlServer,
         IsAutoCloseConnection = true},
         db=>{
               //5.1.3.24统一了语法和SqlSugarScope一样,老版本AOP可以写外面
               db.Aop.OnLogExecuting = (sql, pars) =>
               {
                     Console.WriteLine(sql);//输出sql,查看执行sql 性能无影响
                           
                     //获取原生SQL推荐 5.1.4.63性能OK
                     Console.WriteLine(UtilMethods.GetNativeSql(sql,pars))
                              
                     //获取无参数化SQL 对性能有影响,特别大的SQL参数多的,调试使用
                     Console.WriteLine(UtilMethods.GetSqlString(DbType.SqlServer,sql,pars))
               }
               //注意多租户 有几个设置几个
               //db.GetConnection(i).Aop
      });
   //老版本
   //版本太老没有db=>{}委托写在下面一行就行了多库设置SQL

打印和上面有区别,需要一个一个设置//注意:
//如果你用的 GetConnectionScope或者 GetConnectionScopeWithAttr AOP也应该用 GetConnectionScope
//如果你用的 GetConnection或者 GetConnectionWithAttr AOP也应该用 GetConnectionScope


SqlSugarClient Db= new SqlSugarClient(new ConnectionConfig(){
         ConnectionString = "连接符字串",
         DbType = DbType.SqlServer,
         IsAutoCloseConnection = true},
         db=>{
                  //也可以这里面循环
                   db.GetConnection("1").Aop.OnLogExecuting = (sql, pars) =>
                   {
                     Console.WriteLine("执行1库"+sql);
                   };
                   db.GetConnection("0").Aop.OnLogExecuting = (sql, pars) =>
                   {
                      Console.WriteLine("执行0库"+sql);
                   };

}); 国际化

错误提示可以设置相应的语言1.枚举说明

    public enum LanguageType
    {
      Default=0, //中&英
      Chinese=1, //处理过的异常尽量中文,未处理的还是英文
      English=2 //全部英文
    }2.用例 

SqlSugarClient db = new SqlSugarClient(new ConnectionConfig()
{
                ConnectionString = Config.ConnectionString,
                DbType = DbType.SqlServer,
                LanguageType=LanguageType.English,//只显示英文
                IsAutoCloseConnection = true
   }); 长连接用法(3种方式)

1.事务中是长连接

2.手动释放模式是长连接(不推荐需要手动释放)

3.自动释放中 不使用事务我们可以用OpenAlways实现长连接

//5.0.6.3
using (db.Ado.OpenAlways()) {
   
   db.Queryable...
   db.Insertable...
   //比如当前会话生效的临时表就需要长连接,不然创建了访问不了
            
} 配置最小时间

新功能:5.0.8.1推荐用默认的,这样多种数据库使用不报错,当然你也可以强制设置 db.CurrentConnectionConfig.MoreSettings = new ConnMoreSettings
{
      DbMinDate = DateTime.MinValue//默认最小时间是 1900-01-01 00:00:00.000
}; 
来源:https://www.cnblogs.com/yswenli/p/17967640
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