.NET 开源SqlServer ORM框架 SqlSugar 3.0 API

3.1.x ,将作为3.X系统的最后一个版本，下面将会开发 全新的功能

更新列表：https://github.com/sunkaixuan/SqlSugar/releases

优点：

SqlSugar 是一款小巧，并且功能齐全的ORM，并不需要像Dapper一样依赖第三方扩展

SqlSugar 语法易用简单 ，有漂亮的拉姆达语法，也支持Dapper SQL和ADO.NET的所有功能

SqlSugar 性能达到原生水准，远超 Dapper和EF CORE。

SqlSugar 支持.NET CORE , 多个数据库

SqlSugar 体积小巧只有150K是EF的30分之1 ，NUGET直接可以下载

特色功能

SqlbulkCopy和SqlbulkReplace 这两个函数能够处理海量数据插入和更新 ，也是众多ORM没有集成的功能之一

SQL日志功能 可以方便的对SQL进行监控和写入日志

全局过滤器  例如我都有IsDeleted来标识是否删 除， 这样我每查一个表就 要加一个WHERE条件 ，有了全局过滤器就变成非常方便

T4+实体生成 可以自定义实体格式 并且可以能过T4模版快速生成实体文件

POCO设计   实体类没有任何属性完全原生态

所有版本：

ASP.NET 4.0+ MSSQL https://github.com/sunkaixuan/SqlSugar

ASP.NET CORE MSSQL https://github.com/sunkaixuan/ASP_NET_CORE_ORM_SqlSugar

ASP.NET 4.0+ MYSQL https://github.com/sunkaixuan/MySqlSugar

ASP.NET CORE MYSQL https://github.com/sunkaixuan/ASP_NET_CORE_ORM_MySqlSugar

ASP.NET 4.0+ Sqlite https://github.com/sunkaixuan/SqliteSugar

ASP.NET CORE Sqlite https://github.com/sunkaixuan/ASP_NET_CORE_ORM_MySqlSugar

ASP.NET 4.0+ ORACLE https://github.com/sunkaixuan/OracleSugar

连接数据库

1.简单用法

using(var db = new SqlSugarClient(ConnectionString)){

    //use object
    var list=db.Queryable<T>().ToList();

}

2.打包用法，推荐

/// <summary>
/// SqlSugar
/// </summary>
public class SugarDao
{
    private SugarDao()
    {

    }
    public static string ConnectionString
    {
        get
        {
            string reval = "server=.;uid=sa;pwd=sasa;database=SqlSugarTest";
            return reval;
        }
    }
    public static SqlSugarClient GetInstance()
    {
        var db = new SqlSugarClient(ConnectionString);
        db.IsEnableLogEvent = true;//Enable log events
        db.LogEventStarting = (sql, par) => { Console.WriteLine(sql + " " + par+"\r\n"); };
        return db;
    }
}

使用打包对象

using (var db = SugarDao.GetInstance())
{
    var list=db.Queryable<T>().ToList();
}

3.高级玩法，基于IOC和指挥官模式的DEMO

https://github.com/sunkaixuan/ASPNETMVCCRUDDEMO

0、功能预览

                /****************************基本功能**************************************/
                //查询
                case "select": demo = new Select(); break;
                //删除
                case "delete": demo = new Delete(); break;
                //插入
                case "insert": demo = new Insert(); break;
                //更新
                case "update": demo = new Update(); break;
                //基层函数的用法
                case "ado": demo = new Ado(); break;
                //事务
                case "tran": demo = new Tran(); break;
                //创建实体函数
                case "createclass": demo = new CreateClass(); break;
                //T4生成 http://www.cnblogs.com/sunkaixuan/p/5751503.html

                //日志记录
                case "log": demo = new Log(); break;
                //枚举支持
                case "enum": demo = new EnumDemo(); break;

                /****************************实体映射**************************************/
                //自动排除非数据库列
                case "ignoreerrorcolumns": demo = new IgnoreErrorColumns(); break;
                //别名表
                case "mappingtable":demo=new MappingTable(); break;
                //别名列
                case "mappingcolumns": demo = new MappingColumns(); break;
                //通过属性的方法设置别名表和别名字段
                case "attributesmapping": demo = new AttributesMapping(); break;

                /****************************业务应用**************************************/
                //过滤器
                case "filter": demo = new Filter(); break;
                //过滤器2
                case "filter2": demo = new Filter2(); break;
                //流水号功能
                case "serialnumber": demo = new SerialNumber(); break;

                //多语言支持 http://www.cnblogs.com/sunkaixuan/p/5709583.html
                //多库并行计算 http://www.cnblogs.com/sunkaixuan/p/5046517.html

                /****************************支持**************************************/
                //公开函数数
                case "pubmethod": demo = new PubMethod(); break;
                //Sql2012分页的支持
                case "sqlpagemodel": demo=new SqlPageModel(); break;
                //设置ToJson的日期格式
                case "serializerdateformat":demo =new SerializerDateFormat();break;

                default: Console.WriteLine("switchOn的值错误，请输入正确的 case"); break;

1、使用拉姆达进行查询

                //查询所有
                var student = db.Queryable<Student>().ToList();
                var studentDynamic = db.Queryable<Student>().ToDynamic();
                var studentJson = db.Queryable<Student>().ToJson();

                //查询单条
                var single = db.Queryable<Student>().Single(c => c.id == );
                //查询单条根据主键
                var singleByPk = db.Queryable<Student>().InSingle();
                //查询单条没有记录返回空对象
                var singleOrDefault = db.Queryable<Student>().SingleOrDefault(c => c.id == );
                //查询单条没有记录返回空对象
                var single2 = db.Queryable<Student>().Where(c => c.id == ).SingleOrDefault();

                //查询第一条
                var first = db.Queryable<Student>().Where(c => c.id == ).First();
                var first2 = db.Queryable<Student>().Where(c => c.id == ).FirstOrDefault();

                //取11-20条
                var page1 = db.Queryable<Student>().Where(c => c.id > ).OrderBy(it => it.id).Skip().Take().ToList();

                //取11-20条  等于 Skip(pageIndex-1)*pageSize).Take(pageSize) 等于  between (pageIndex-1)*pageSize and  pageIndex*pageSize
                var page2 = db.Queryable<Student>().Where(c => c.id > ).OrderBy(it => it.id).ToPageList(, );

                //查询条数
                var count = db.Queryable<Student>().Where(c => c.id > ).Count();

                //从第2条开始以后取所有
                var skip = db.Queryable<Student>().Where(c => c.id > ).OrderBy(it => it.id).Skip().ToList();

                //取前2条
                var take = db.Queryable<Student>().Where(c => c.id > ).OrderBy(it => it.id).Take().ToList();

                //Not like
                string conval = "a";
                var notLike = db.Queryable<Student>().Where(c => !c.name.Contains(conval.ToString())).ToList();

                //Like
                conval = "三";
                var like = db.Queryable<Student>().Where(c => c.name.Contains(conval)).ToList();

                //支持字符串Where 让你解决，更复杂的查询
                var student12 = db.Queryable<Student>().Where(c => "a" == "a").Where("id>@id", new { id =  }).ToList();
                var student13 = db.Queryable<Student>().Where(c => "a" == "a").Where("id>100 and id in( select 1)").ToList();

                //存在记录反回true，则否返回false
                bool isAny100 = db.Queryable<Student>().Any(c => c.id == );
                bool isAny1 = db.Queryable<Student>().Any(c => c.id == );

                //获取最大Id
                object maxId = db.Queryable<Student>().Max(it => it.id);
                int maxId1 = db.Queryable<Student>().Max(it => it.id).ObjToInt();//拉姆达
                int maxId2 = db.Queryable<Student>().Max<int>("id"); //字符串写法

                //获取最小
                int minId1 = db.Queryable<Student>().Where(c => c.id > ).Min(it => it.id).ObjToInt();//拉姆达
                int minId2 = db.Queryable<Student>().Where(c => c.id > ).Min<int>("id");//字符串写法

                //order By
                var orderList = db.Queryable<Student>().OrderBy("id desc,name asc").ToList();//字符串支持多个排序
                //可以多个order by表达示
                var order2List = db.Queryable<Student>().OrderBy(it => it.name).OrderBy(it => it.id, OrderByType.desc).ToList(); // order by name as ,order by id desc

                //In
                var intArray = new[] { "", "", "" };
                var intList = intArray.ToList();
                var listnew = db.Queryable<Student>().Where(it => intArray.Contains(it.name)).ToList();
                var list0 = db.Queryable<Student>().In(it => it.id, , , ).ToList();
                var list1 = db.Queryable<Student>().In(it => it.id, intArray).ToList();
                var list2 = db.Queryable<Student>().In("id", intArray).ToList();
                var list3 = db.Queryable<Student>().In(it => it.id, intList).ToList();
                var list4 = db.Queryable<Student>().In("id", intList).ToList();
                var list6 = db.Queryable<Student>().In(intList).ToList();//不设置字段默认主键

                //分组查询
                var list7 = db.Queryable<Student>().Where(c => c.id < ).GroupBy(it => it.sex).Select("sex,count(*) Count").ToDynamic();
                var list8 = db.Queryable<Student>().Where(c => c.id < ).GroupBy(it => it.sex).GroupBy(it => it.id).Select("id,sex,count(*) Count").ToDynamic();
                List<StudentGroup> list9 = db.Queryable<Student>().Where(c => c.id < ).GroupBy(it => it.sex).Select<StudentGroup>("Sex,count(*) Count").ToList();
                List<StudentGroup> list10 = db.Queryable<Student>().Where(c => c.id < ).GroupBy("sex").Select<StudentGroup>("Sex,count(*) Count").ToList();
                //SELECT Sex,Count=count(*)  FROM Student  WHERE 1=1  AND  (id < 20)    GROUP BY Sex --生成结果

                //2表关联查询
                var jList = db.Queryable<Student>()
                .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //默认left join
                .Where<School>((s1, s2) => s1.id == )
                .Select("s1.*,s2.name as schName")
                .ToDynamic();

                /*等于同于
                 SELECT s1.*,s2.name as schName
                 FROM [Student]  s1
                 LEFT JOIN [School]  s2 ON  s1.sch_id  = s2.id
                 WHERE  s1.id  = 1 */

                //2表关联查询并分页
                var jList2 = db.Queryable<Student>()
                .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) //默认left join
                    //如果要用inner join这么写
                    //.JoinTable<School>((s1, s2) => s1.sch_id == s2.id ,JoinType.INNER)
                .Where<School>((s1, s2) => s1.id > )
                .OrderBy(s1 => s1.name)
                .Skip()
                .Take()
                .Select("s1.*,s2.name as schName")
                .ToDynamic();

                //3表查询并分页
                var jList3 = db.Queryable<Student>()
               .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) // left join  School s2  on s1.id=s2.id
               .JoinTable<School>((s1, s3) => s1.sch_id == s3.id) // left join  School s3  on s1.id=s3.id
               .Where<School>((s1, s2) => s1.id > )  // where s1.id>1
               .Where(s1 => s1.id > )
               .OrderBy<School>((s1, s2) => s1.id) //order by s1.id 多个order可以  .oderBy().orderby 叠加
               .Skip()
               .Take()
               .Select("s1.*,s2.name as schName,s3.name as schName2")//select目前只支持这种写法
               .ToDynamic();

                //上面的方式都是与第一张表join，第三张表想与第二张表join写法如下
                List<V_Student> jList4 =
                 db.Queryable<Student>()
                 .JoinTable<School>((s1, s2) => s1.sch_id == s2.id) // left join  School s2  on s1.id=s2.id
                 .JoinTable<School, Area>((s1, s2, a1) => a1.id == s2.AreaId)// left join  Area a1  on a1.id=s2.AreaId  第三张表与第二张表关联
                 .JoinTable<Area, School>((s1, a1, s3) => a1.id == s3.AreaId)// left join  School s3  on a1.id=s3.AreaId  第四第表第三张表关联
                 .JoinTable<School>((s1, s4) => s1.sch_id == s4.id) // left join  School s2  on s1.id=s4.id
                 .Select<School, Area, V_Student>((s1, s2, a1) => new V_Student { id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name }).ToList();

                //等同于
                //SELECT id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name
                //FROM [Student]   s1
                //LEFT JOIN School  s2 ON  ( s1.sch_id  = s2.id )
                //LEFT JOIN Area  a1 ON  ( a1.id  = s2.AreaId )     //第三张表与第二张表关联
                //LEFT JOIN School  s3 ON  ( a1.id  = s3.AreaId )   //第四张表与第三张表关联
                //LEFT JOIN School  s4 ON  ( s1.sch_id  = s4.id )
                //WHERE 1=1    

                //Join子查询语句加分页的写法
                var childQuery = db.Queryable<Area>().Where("id=@id").Select(it => new { id = it.id }).ToSql();//创建子查询SQL
                string childTableName =SqlSugarTool.PackagingSQL(childQuery.Key);//将SQL语句用()包成表
                var queryable = db.Queryable<Student>()
                 .JoinTable<School>((s1, s2) => s1.sch_id == s2.id)  //LEFT JOIN School  s2 ON  ( s1.sch_id  = s2.id )
                 .JoinTable(childTableName, "a1", "a1.id=s2.areaid", new { id =  }, JoinType.INNER) //INNER JOIN (SELECT *  FROM [Area]   WHERE 1=1  AND id=@id   ) a1 ON a1.id=s2.areaid
                 .OrderBy(s1 => s1.id);

                var list = queryable.Select<School, Area, V_Student>((s1, s2, a1) => new V_Student { id = s1.id, name = s1.name, SchoolName = s2.name, AreaName = a1.name })
                    .ToPageList(, );
                var count2 = queryable.Count();

                //拼接例子
                var queryable2 = db.Queryable<Student>().Where(it => true);
                if (maxId.ObjToInt() == )
                {
                    queryable2.Where(it => it.id == );
                }
                else
                {
                    queryable2.Where(it => it.id == );
                }
                var listJoin = queryable2.ToList();

                //queryable和SqlSugarClient解耦
                var par = new Queryable<Student>().Where(it => it.id == );//声名没有connection对象的Queryable
                par.DB = db;
                var listPar = par.ToList();

                //查看生成的sql和参数
                var id = ;
                var sqlAndPars = db.Queryable<Student>().Where(it => it.id == id).OrderBy(it => it.id).ToSql();

                //拉姆达支持的函数操作
                var par1 = "2015-1-1"; var par2 = "   我 有空格A, ";
                var r1 = db.Queryable<Student>().Where(it => it.name == par1.ObjToString()).ToList(); //ObjToString会将null转转成""
                var r2 = db.Queryable<InsertTest>().Where(it => it.d1 == par1.ObjToDate()).ToList();
                var r3 = db.Queryable<InsertTest>().Where(it => it.id == .ObjToInt()).ToList();//ObjToInt会将null转转成0
                var r4 = db.Queryable<InsertTest>().Where(it => it.id == .ObjToDecimal()).ToList();
                var r5 = db.Queryable<InsertTest>().Where(it => it.id == .ObjToMoney()).ToList();
                var r6 = db.Queryable<InsertTest>().Where(it => it.v1 == par2.Trim()).ToList();
                var convert1 = db.Queryable<Student>().Where(c => c.name == "a".ToString()).ToList();
                var convert2 = db.Queryable<Student>().Where(c => c.id == Convert.ToInt32("")).ToList();
                var convert3 = db.Queryable<Student>().Where(c => c.name == par2.ToLower()).ToList();
                var convert4 = db.Queryable<Student>().Where(c => c.name == par2.ToUpper()).ToList();
                var convert5= db.Queryable<Student>().Where(c => DateTime.Now > Convert.ToDateTime("2015-1-1")).ToList();
                var c1 = db.Queryable<Student>().Where(c => c.name.Contains("a")).ToList();
                var c2 = db.Queryable<Student>().Where(c => c.name.StartsWith("a")).ToList();
                var c3 = db.Queryable<Student>().Where(c => c.name.EndsWith("a")).ToList();
                var c4 = db.Queryable<Student>().Where(c => !string.IsNullOrEmpty(c.name)).ToList();
                var c5 = db.Queryable<Student>().Where(c => c.name.Equals("小杰")).ToList();
                var c6 = db.Queryable<Student>().Where(c => c.name.Length > ).ToList();
                var time = db.Queryable<InsertTest>().Where(c => c.d1>DateTime.Now.AddDays()).ToList();
                var time2 = db.Queryable<InsertTest>().Where(c => c.d1 > DateTime.Now.AddYears()).ToList();
                var time3 = db.Queryable<InsertTest>().Where(c => c.d1 > DateTime.Now.AddMonths()).ToList();

2、使用原生SQL查询

                //转成list
                List<Student> list1 = db.SqlQuery<Student>("select * from Student");
                //转成list带参
                List<Student> list2 = db.SqlQuery<Student>("select * from Student where id=@id", new { id =  });
                //转成dynamic
                dynamic list3 = db.SqlQueryDynamic("select * from student");
                //转成json
                string list4 = db.SqlQueryJson("select * from student");
                //返回int
                var list5 = db.SqlQuery<int>("select top 1 id from Student").SingleOrDefault();
                //反回键值
                Dictionary<string, string> list6 = db.SqlQuery<KeyValuePair<string, string>>("select id,name from Student").ToDictionary(it => it.Key, it => it.Value);
                //反回List<string[]>
                var list7 = db.SqlQuery<string[]>("select top 1 id,name from Student").SingleOrDefault();
                //存储过程
                var spResult = db.SqlQuery<School>("exec sp_school @p1,@p2", new { p1 = , p2 =  });

                //存储过程加Output
                var pars = SqlSugarTool.GetParameters(new { p1 = ,p2= }); //将匿名对象转成SqlParameter
                db.IsClearParameters = false;//禁止清除参数
                pars[].Direction = ParameterDirection.Output; //将p2设为 output
                var spResult2 = db.SqlQuery<School>("exec sp_school @p1,@p2 output", pars);
                db.IsClearParameters = true;//启动请动清除参数
                var outPutValue = pars[].Value;//获取output @p2的值

                //获取第一行第一列的值
                string v1 = db.GetString("select '张三' as name");
                int v2 = db.GetInt("select 1 as name");
                double v3 = db.GetDouble("select 1 as name");
                decimal v4 = db.GetDecimal("select 1 as name");

3、SQL高级拼接器写法

 using (var db = SugarDao.GetInstance())
            {
                //---------Sqlable,创建多表查询---------//

                //多表查询
                List<School> dataList = db.Sqlable()
                   .From("school", "s")
                   .Join("student", "st", "st.id", "s.id", JoinType.INNER)
                   .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT)
                   .Where("s.id>100 and s.id<@id")
                   .Where("1=1")//可以多个WHERE
                   .OrderBy("id")
                   .SelectToList<School/*新的Model我这里没有所以写的School*/>("st.*", new { id =  });

                //多表分页
                List<School> dataPageList = db.Sqlable()
                    .From("school", "s")
                    .Join("student", "st", "st.id", "s.id", JoinType.INNER)
                    .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT)
                    .Where("s.id>100 and s.id<100")
                    .SelectToPageList<School>("st.*", "s.id", , );

                //多表分页WHERE加子查询
                List<School> dataPageList2 = db.Sqlable()
                    .From("school", "s")
                    .Join("student", "st", "st.id", "s.id", JoinType.INNER)
                    .Join("student", "st2", "st2.id", "st.id", JoinType.LEFT)
                    .Where("s.id>100 and s.id<100 and s.id in (select 1 )" /*这里面写子查询都可以*/)
                    .SelectToPageList<School>("st.*", "s.id", , );

                //--------转成List Dynmaic 或者 Json-----//

                //不分页
                var list1 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToDynamic("*", new { id =  });
                var list2 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToJson("*", new { id =  });
                var list3 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToDataTable("*", new { id =  });

                //分页
                var list4 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageDynamic("s.*", "l.id", , , new { id =  });
                var list5 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageTable("s.*", "l.id", , , new { id =  });
                var list6 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToPageDynamic("s.*", "l.id", , , new { id =  });

                //--------拼接-----//
                Sqlable sable = db.Sqlable().From<Student>("s").Join<School>("l", "s.sch_id", "l.id", JoinType.INNER);
                string name = "a";
                int id = ;
                if (!string.IsNullOrEmpty(name))
                {
                    sable = sable.Where("s.name=@name");
                }
                if (!string.IsNullOrEmpty(name))
                {
                    sable = sable.Where("s.id=@id or s.id=100");
                }
                if (id > )
                {
                    sable = sable.Where("l.id in (select top 10 id from school)");//where加子查询
                }
                var pars = new { id = id, name = name };
                int pageCount = sable.Count(pars);
                var list7 = sable.SelectToPageList<Student>("s.*", "l.id desc", , , pars);

            }

4、更新

                //指定列更新
                db.Update<School>(new { name = "蓝翔14" }, it => it.id == ); //只更新name列
                db.Update<School, int>(new { name = "蓝翔11 23 12", areaId =  }, , , );
                db.Update<School, string>(new { name = "蓝翔2" }, new string[] { "", "" });
                db.Update<School>(new { name = "蓝翔2" }, it => it.id == );

                //支持字典更新，适合动态权限
                var dic = new Dictionary<string, string>();
                dic.Add("name", "第十三条");
                dic.Add("areaId", "");
                db.Update<School, int>(dic, );

                //整个实体更新
                db.Update(new School { id = , name = "蓝翔16", AreaId =  });
                db.Update<School>(new School { id = , name = "蓝翔12", AreaId =  }, it => it.id == );
                db.Update<School>(new School() { id = , name = "青鸟11" });

                //设置不更新列
                db.DisableUpdateColumns = new string[] { "CreateTime" };//设置CreateTime不更新

                TestUpdateColumns updObj = new TestUpdateColumns()
                {
                    VGUID = Guid.Parse("542b5a27-6984-47c7-a8ee-359e483c8470"),
                    Name = "xx",
                    Name2 = "xx2",
                    IdentityField = ,
                    CreateTime = null
                };

                //CreateTime将不会被更新
                db.Update(updObj);
                //以前实现这种更新需要用指定列的方式实现，现在就简单多了。

                //批量更新   数据量小时建议使用
                var updateResult = db.UpdateRange(GetUpdateList());

                //批量更新  数据量大时建议使用
                var updateResult2 = db.SqlBulkReplace(GetUpdateList2());

5、删除和状态删除

               //删除
                db.Delete<School, int>();
                db.Delete<School>(it => it.id > );
                //主键批量删除
                db.Delete<School, string>(new string[] { "", "", "" });
                //非主键批量删除
                db.Delete<School, string>(it => it.name, new string[] { "" });
                db.Delete<School, int>(it => it.id, new int[] { ,  });

                //假删除
                //db.FalseDelete<school>("is_del", 100);
                //等同于 update school set is_del=1 where id in(100)
                //db.FalseDelete<school>("is_del", it=>it.id==100);

6、插入

                db.Insert(GetInsertItem()); //插入一条记录 (有主键也好，没主键也好，有自增列也好都可以插进去)

                db.InsertRange(GetInsertList()); //批量插入 支持（别名表等功能）

                db.SqlBulkCopy(GetInsertList()); //批量插入 适合海量数据插入，要求实体与数据库一致，不支持(别名表、排除列等功能)

                //设置不插入列
                db.DisableInsertColumns = new string[] { "sex" };//sex列将不会插入值
                Student s = new Student()
                {
                    name = "张" + new Random().Next(, int.MaxValue),
                    sex = "gril"
                };
                var id = db.Insert(s); //插入
                //查询刚插入的sex是否有值
                var sex = db.Queryable<Student>().Single(it => it.id == id.ObjToInt()).sex;//无值
                var name = db.Queryable<Student>().Single(it => it.id == id.ObjToInt()).name;//有值

7、枚举支持

  var stuList = db.Queryable<Student>().ToList();
                db.Insert<Student>(new Student() { sch_id = SchoolEnum.北大青鸟 });
                db.Update<Student>(new Student() { sch_id = SchoolEnum.it清华, id =  });
                var stuList2 = db.Queryable<Student>().Where(it => it.sch_id == SchoolEnum.全智).ToList();

8、实体生成加T4

 //可以结合别名表，请看别名表的用法
                //db.SetMappingTables(mappingTableList);

                db.ClassGenerating.CreateClassFiles(db, ("e:/TestModels"), "Models");

                //只生成student和school表的实体
                db.ClassGenerating.CreateClassFilesByTableNames(db, "e:/TestModels2", "Models", new string[] { "student", "school" });

                //根据表名生成class字符串
                var str = db.ClassGenerating.TableNameToClass(db, "Student");

                var dynamicToClassStr = db.ClassGenerating.DynamicToClass(new { id =  }, "dyName");

                //根据SQL语句生成class字符串
                var str2 = db.ClassGenerating.SqlToClass(db, "select top 1 * from Student", "student");

                //改变值（lassTemplate.ItemTemplate=XXXX）可以自定义格式
                var tempItem = ClassTemplate.ItemTemplate;//例如可以在生成的实体添加默认构造函数给指定的字段赋默认值或者公司信息等
                var temp = ClassTemplate.Template;

                //设置新格式模板
                //主键Guid.New(),
                //CreateTime为DateTime.Now
                //IsRemove=0
                //UpdateTime为DateTime.Now
                ClassTemplate.Template = "using System;\r\nusing System.Linq;\r\nusing System.Text;\r\n\r\nnamespace $namespace\r\n{\r\n    public class $className\r\n    {\r\n        public $className() \r\n        { \r\n            this.CreateTime = DateTime.Now;\r\n            this.  = 0;\r\n            this.UpdateTime=DateTime.Now;\r\n            this.$primaryKeyName=Guid.NewGuid().ToString(\"N\").ToUpper();\r\n        }\r\n        $foreach\r\n    }\r\n}\r\n";

                //新格式的实体字符串
                var str3 = db.ClassGenerating.TableNameToClass(db, "Student");

使用T4

详细教程：

http://www.cnblogs.com/sunkaixuan/p/5751503.html

9、ADO.NET

  var r1 = db.GetDataTable("select * from student");
                var r2 = db.GetSingle<Student>("select top 1 * from student");
                var r3 = db.GetScalar("select  count(1) from student");
                var r4 = db.GetReader("select  count(1) from student");
                r4.Dispose();
                var r5 = db.GetString("select  top 1 name from student");
                var r6 = db.ExecuteCommand("select 1");

                //参数支持
                var p1 = db.GetDataTable("select * from student where id=@id", new {id= });
                var p2 = db.GetDataTable("select * from student where id=@id", new Dictionary<string, object>() { { "id", "" } });//目前只支持 Dictionary<string, object>和Dictionary<string, string>
                var p3 = db.GetDataTable("select * from student where id=@id", new SqlParameter("@id",) );

10、日志记录功能

   //日志记录功能
    public class Log : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动Log.Init");
            using (var db = SugarDemoDao.GetInstance())
            {

                var a1 = db.Queryable<Student>().Where(it => it.id == ).ToList();
                var a2 = db.Queryable<Student>().OrderBy(it => it.id).ToList();
            }
        }

        public class SugarConfigs
        {
            public static Action<string, string> LogEventStarting = (sql, pars) =>
            {
                Console.WriteLine("starting:" + sql + " " + pars);

                using (var db = SugarDemoDao.GetInstance())
                {
                    //日志记录件事件里面用到数据库操作 IsEnableLogEvent一定要为false否则将引起死循环，并且要新开一个数据实例 像我这样写就没问题。
                    db.IsEnableLogEvent = false;
                    db.ExecuteCommand("select 1");
                }
            };
            public static Action<string, string> LogEventCompleted = (sql, pars) =>
            {
                Console.WriteLine("completed:" + sql + " " + pars);
            };
        }

        /// <summary>
        /// SqlSugar
        /// </summary>
        public class SugarDemoDao
        {

            public static SqlSugarClient GetInstance()
            {
                var db = new SqlSugarClient(SugarDao.ConnectionString);
                db.IsEnableLogEvent = true;//启用日志事件
                db.LogEventStarting = SugarConfigs.LogEventStarting;
                db.LogEventCompleted = SugarConfigs.LogEventCompleted;
                return db;
            }
        }
    }
}

11、别名表功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NewTest.Dao;
using Models;
using System.Data.SqlClient;
using SqlSugar;
namespace NewTest.Demos
{
    //别名表的功能
    public class MappingTable : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动MappingTable.Init");

            //单个设置
            using (var db = SugarDao.GetInstance())
            {
                var list = db.Queryable<V_Student>("Student").ToList();//查询的是 select * from student 而我的实体名称为V_Student
            }

            //全局设置
            using (var db = SugarFactory.GetInstance())
            {
                var list = db.Queryable<V_Student>().ToList();//查询的是 select * from student 而我的实体名称为V_Student
            }
        }

        /// <summary>
        /// 全局配置类
        /// </summary>
        public class SugarConfigs
        {
            //key类名 value表名
            public static List<KeyValue> MpList = new List<KeyValue>(){
            new KeyValue(){ Key="FormAttr", Value="Flow_FormAttr"},
            new KeyValue(){ Key="Student3", Value="Student"},
            new KeyValue(){ Key="V_Student", Value="Student"}
            };
        }

        /// <summary>
        /// SqlSugar实例工厂
        /// </summary>
        public class SugarFactory
        {

            //禁止实例化
            private SugarFactory()
            {

            }
            public static SqlSugarClient GetInstance()
            {
                string connection = SugarDao.ConnectionString; //这里可以动态根据cookies或session实现多库切换
                var db = new SqlSugarClient(connection);
                db.SetMappingTables(SugarConfigs.MpList);//设置关联表 (引用地址赋值，每次赋值都只是存储一个内存地址)
                return db;
            }
        }
    }
}

12别名列功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NewTest.Dao;
using System.Data.SqlClient;
using SqlSugar;
namespace NewTest.Demos
{
    //别名列的功能
    public class MappingColumns : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动MappingColumns.Init");

            //全局设置
            using (var db = SugarFactory.GetInstance())
            {
                var list = db.Queryable<Student>().Where(it=>it.classId==).ToList();
            }
        }

        public class Student
        {

            //id
            public int classId { get; set; }

            //name
            public string className { get; set; }

            //sch_id
            public int classSchoolId { get; set; }

            public int isOk { get; set; }
        }

        /// <summary>
        /// 全局配置别名列（不区分表）
        /// </summary>
        public class SugarConfigs
        {
            //key实体字段名 value表字段名 ，KEY唯一否则异常
            public static List<KeyValue> MpList = new List<KeyValue>(){
            new KeyValue(){ Key="classId", Value="id"},
            new KeyValue(){ Key="className", Value="name"},
            new KeyValue(){ Key="classSchoolId", Value="sch_id"}
            };
        }

        /// <summary>
        /// SqlSugar实例工厂
        /// </summary>
        public class SugarFactory
        {

            //禁止实例化
            private SugarFactory()
            {

            }
            public static SqlSugarClient GetInstance()
            {
                string connection = SugarDao.ConnectionString; //这里可以动态根据cookies或session实现多库切换
                var db = new SqlSugarClient(connection);
                //注意：只有启动属性映射才可以使用SetMappingColumns
                db.IsEnableAttributeMapping = true;
                db.SetMappingColumns(SugarConfigs.MpList);//设置关联列 (引用地址赋值，每次赋值都只是存储一个内存地址)
                return db;
            }
        }
    }
}

13通过属性来设置别名表和别名列

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NewTest.Dao;
using Models;
using System.Data.SqlClient;
using SqlSugar;
namespace NewTest.Demos
{
    //通过属性的方法设置别名表和别名字段（主键和自添列都无需设置 SQLSUGAR会帮你自动处理）
    //注意:【属性映射和 (SetMappingTables、SetMappingColumns)方式映射 2种选其中一，不清楚底层缓存机质不建议同时使用】
    public class AttributesMapping : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动AttributesMapping.Init");
            using (var db = DBManager.GetInstance())
            {

                //查询
                var list = db.Queryable<TestStudent>()
                    .Where(it => it.className.Contains("小")).OrderBy(it => it.classSchoolId).Select<V_Student>(it => new V_Student() { id = it.classId, name = it.className }).ToList();
                var list2 = db.Queryable<TestStudent>()
                    .JoinTable<TestSchool>((s1, s2) => s1.classSchoolId == s2.classId)
                    .OrderBy<TestSchool>((s1, s2) => s1.classId)
                    .Select<TestStudent, TestSchool, V_Student>((s1, s2) => new V_Student() { id = s1.classId, name = s1.className, SchoolName = s2.className }).ToList();

                //添加
                TestStudent s = new TestStudent();
                s.className = "属性名";
                s.classSchoolId = ;
                var id = db.Insert(s);
                s.classId = id.ObjToInt();

                //更新
                db.Update(s);
                db.Update<TestStudent, int>(s, );
                db.Update<TestStudent>(s, it => it.classId == );
                db.SqlBulkReplace(new List<TestStudent>() { s });

                //删除
                db.Delete<TestStudent>(it => it.classId == );
            }
        }

        /// <summary>
        /// 属性只作为初始化映射，SetMappingTables和SetMappingColumns可以覆盖
        /// </summary>
        [SugarMapping(TableName = "Student")]
        public class TestStudent
        {

            [SugarMapping(ColumnName = "id")]
            public int classId { get; set; }

            [SugarMapping(ColumnName = "name")]
            public string className { get; set; }

            [SugarMapping(ColumnName = "sch_id")]
            public int classSchoolId { get; set; }

            public int isOk { get; set; }

            /// <summary>
            /// 数据库并没有这一列
            /// </summary>
            public string errorField { get; set; }
        }

        [SugarMapping(TableName = "School")]
        public class TestSchool
        {

            [SugarMapping(ColumnName = "id")]
            public int classId { get; set; }

            [SugarMapping(ColumnName = "name")]
            public string className { get; set; }

            public int AreaId = ;
        }
    }

    public class DBManager
    {

        public static SqlSugarClient GetInstance()
        {
            var db = new SqlSugarClient(SugarDao.ConnectionString);
            db.IsEnableAttributeMapping = true;//启用属性映射
            db.IsIgnoreErrorColumns = true;//忽略非数据库列

            db.IsEnableLogEvent = true;//启用日志事件
            db.LogEventStarting = (sql, par) => { Console.WriteLine(sql + " " + par + "\r\n"); };

            return db;
        }
    }
}

14、行列过滤 (行过滤器可以设置多个，以逗号隔开)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NewTest.Dao;
using Models;
using System.Data.SqlClient;
using SqlSugar;

namespace NewTest.Demos
{
    //行过滤加列过滤
    //权限管理的最佳设计
    public class Filter2 : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动Filter2.Init");
            using (SqlSugarClient db = SugarDaoFilter.GetInstance())//开启数据库连接
            {
                //设置走哪个过滤器
                db.CurrentFilterKey = "role1";
                //queryable
                var list = db.Queryable<Student>().ToJson(); //where id=1 , 可以查看id和name

                //设置走哪个过滤器
                db.CurrentFilterKey = "role2";
                //queryable
                var list2 = db.Queryable<Student>().ToJson(); //where id=2 , 可以查看name

            }
        }
        /// <summary>
        /// 扩展SqlSugarClient
        /// </summary>
        public class SugarDaoFilter
        {
            //禁止实例化
            private SugarDaoFilter()
            {

            }
            /// <summary>
            /// 页面所需要的过滤行
            /// </summary>
            private static Dictionary<string, Func<KeyValueObj>> _filterParas = new Dictionary<string, Func<KeyValueObj>>()
            {
              { "role1",()=>{
                        return new KeyValueObj(){ Key=" id=@id" , Value=new{ id=}};
                   }
              },
              { "role2",()=>{
                  return new KeyValueObj() { Key = " id=@id", Value = new { id =  } };
                  }
              },
            };
            /// <summary>
            /// 页面所需要的过滤列
            /// </summary>
            private static Dictionary<string, List<string>> _filterColumns = new Dictionary<string, List<string>>()
            {
              { "role1",new List<string>(){"id","name"}
              },
              { "role2",new List<string>(){"name"}
              },
            };
            public static SqlSugarClient GetInstance()
            {
                string connection = SugarDao.ConnectionString; //这里可以动态根据cookies或session实现多库切换
                var reval = new SqlSugarClient(connection);

                //支持sqlable和queryable
                reval.SetFilterFilterParas(_filterParas);

                //列过滤只支持queryable
                reval.SetFilterFilterParas(_filterColumns);
                return reval;
            }
        }
    }
}

15、自动排除非数据库列

    //排除错误列
    public class IgnoreErrorColumns : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动IgnoreErrorColumns.Init");
            using (var db = SugarDao.GetInstance())
            {
                db.IsIgnoreErrorColumns = true;

                //Student表并没有 AreaName
               var id=  db.Insert<STUDENT>(new STUDENT() { name = "张三", AreaName = "北大" });

                db.Update<STUDENT>(new STUDENT() { id=id.ObjToInt() ,name = "张三2", AreaName = "北大" });
            }
        }
        public class STUDENT {
            /// <summary>
            /// Desc:-
            /// Default:-
            /// Nullable:False
            /// </summary>
            public int id { get; set; }

            /// <summary>
            /// Desc:-
            /// Default:-
            /// Nullable:True
            /// </summary>
            public string name { get; set; }

            /// <summary>
            /// Desc:学校ID
            /// Default:-
            /// Nullable:True
            /// </summary>
            public int? sch_id { get; set; }

            /// <summary>
            /// Desc:-
            /// Default:-
            /// Nullable:True
            /// </summary>
            public string sex { get; set; }

            /// <summary>
            /// Desc:-
            /// Default:-
            /// Nullable:True
            /// </summary>
            public Boolean? isOk { get; set; }

            public string SchoolName { get; set; }

            public string AreaName { get; set; }

            public string SubjectName { get; set; }
        }
    }

16、事务

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NewTest.Dao;
using Models;
using System.Data.SqlClient;
using SqlSugar;

namespace NewTest.Demos
{
    //事务
    public class Tran : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动Tran.Init");
            using (SqlSugarClient db = SugarDao.GetInstance())//开启数据库连接
            {
                db.IsNoLock = true;//启用无锁查询
                db.CommandTimeOut = ;//设置超时时间
                try
                {
                    db.BeginTran();//开启事务
                    //db.BeginTran(IsolationLevel.ReadCommitted);+3重载可以设置事世隔离级别

                    db.CommitTran();//提交事务
                }
                catch (Exception)
                {
                    db.RollbackTran();//回滚事务
                    throw;
                }
            }
        }
    }
}

17、流水号功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NewTest.Dao;
using Models;
using System.Data.SqlClient;
using SqlSugar;

namespace NewTest.Demos
{
    //流水号的功能
    public class SerialNumber : IDemos
    {

        public void Init()
        {
            Console.WriteLine("启动SerialNumber.Init");
            using (SqlSugarClient db = SugarFactory.GetInstance())//开启数据库连接
            {
                var dientityValue = db.Insert<Student>(new Student() {   });
                var name = db.Queryable<Student>().Single(it => it.id == dientityValue.ObjToInt()).name;
                Console.WriteLine(name);

                var dientityValue2 = db.Insert<School>(new School() { });
                var name2 = db.Queryable<School>().Single(it => it.id == dientityValue2.ObjToInt()).name;
                Console.WriteLine(name2); ;
            }
        }

        /// <summary>
        /// 全局配置类
        /// </summary>
        public class SugarConfigs
        {
            public static List<PubModel.SerialNumber> NumList = new List<PubModel.SerialNumber>(){
              new PubModel.SerialNumber(){TableName="Student", FieldName="name", GetNumFunc=()=>{ //GetNumFunc在没有事中使用
                  return "stud-"+DateTime.Now.ToString("yyyy-MM-dd");
              }},
                new PubModel.SerialNumber(){TableName="School", FieldName="name",  GetNumFuncWithDb=db=>{ //事务中请使用GetNumFuncWithDb保证同一个DB对象,不然会出现死锁
                  return "ch-"+DateTime.Now.ToString("syyyy-MM-dd");
              }}
            };
        }

        /// <summary>
        /// SqlSugar实例工厂
        /// </summary>
        public class SugarFactory
        {

            //禁止实例化
            private SugarFactory()
            {

            }
            public static SqlSugarClient GetInstance()
            {
                string connection = SugarDao.ConnectionString; //这里可以动态根据cookies或session实现多库切换
                var db = new SqlSugarClient(connection);
                db.SetSerialNumber(SugarConfigs.NumList);//设置流水号
                return db;
            }
        }
    }
}

18、多库并行计算功能

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using SqlSugar;
using System.Configuration;
using System.Data;
using System.Threading.Tasks;
using System.Transactions;
using System.Threading;

namespace WebTest.Demo
{
    /// <summary>
    /// /*******************************************************************分布式计算 demo**************************************************************/
    /// </summary>
    public partial class Cloud : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            var id = Guid.Parse("4FC950EC-7C23-480F-9545-443EBDCA32E9");
            int pageCount = ;

            using (CloudClient db = CloudDao.GetInstance())
            {
                db.PageMaxHandleNumber = ;
                using (CommittableTransaction trans = new CommittableTransaction())//启用分布式事务
                {

                    db.Tran = trans;

                    /*** 增、删、改 ***/

                    //根据配置的百分比，随机插入到某个节点库
                    var s = new student()
                    {
                        createTime = DateTime.Now,
                        id = Guid.NewGuid(),
                        name = Guid.NewGuid() + ""
                    };
                    //db.Insert<student>(s, false/*false表示不是自增列*/); //数据库设计主键为GUID为佳多库计算不会冲突

                    ////并发请求所有节点找出这条数据更新
                    //s.name = "改11";
                    //db.Update<student>(s, it => it.id == s.id);//根据表达示更新

                    //db.Update<student, Guid>(s, s.id);//根据主键更新

                    //db.Update<student, Guid>(s, new Guid[] { s.id });//根据主键数组更新

                    ////并发请求所有节点找出这条数据删除
                    //db.Delete<student>(it => it.id == s.id);

                    trans.Commit();
                }

                db.TranDispose();

                /*** 使用Taskable实现云计算 ***/

                //多线程请求所有数据库节点，获取汇总结果
                var taskDataTable = db.Taskable<DataTable>("SELECT max(NUM) FROM STUDENT").Tasks;
                foreach (var dr in taskDataTable)//遍历所有节点数据
                {
                    var dt = dr.Result.DataTable;//每个节点的数据 类型为DataTable
                    var connectionName = dr.Result.ConnectionString;
                }

                //多线程请求所有数据库节点，获取汇总结果
                var taskInt = db.Taskable<int>("SELECT max(NUM) FROM STUDENT").Tasks;
                foreach (var dr in taskInt)//遍历所有节点数据
                {
                    var dt = dr.Result.Value;//获取单个值
                    var connectionName = dr.Result.ConnectionString;
                }

                //多线程请求所有数据库节点，获取汇总结果
                var taskEntity = db.Taskable<student>("SELECT top 100 * FROM STUDENT").Tasks;
                foreach (var dr in taskEntity)//遍历所有节点数据
                {
                    var dt = dr.Result.Entities;//获取实体集合
                    var connectionName = dr.Result.ConnectionString;
                }

                // //Taskable实现分组查询
                // var groupList = db.Taskable<DataTable>("SELECT name,COUNT(*) AS [count],AVG(num) as num FROM STUDENT WHERE ID IS NOT NULL  GROUP BY NAME ")
                //     .Tasks
                //     .SelectMany(it => it.Result.DataTable.AsEnumerable())
                //     .Select(dr => new { num = Convert.ToInt32(dr["NUM"]), name = dr["NAME"].ToString(), count = Convert.ToInt32(dr["COUNT"]) })
                //     .GroupBy(dr => dr.name).Select(dt => new { name = dt.First().name, count = dt.Sum(dtItem => dtItem.count), num = dt.Sum(dtItem => dtItem.num) / dt.Sum(dtItem => dtItem.count) }).ToList();

                // //输出结果
                // foreach (var it in groupList)
                // {
                //     var num = it.num;
                //     var name = it.name;
                //     var count = it.count;
                // }

                // //简化
                // var groupList2 = db.Taskable<DataTable>("SELECT NAME,COUNT(*) AS [COUNT],AVG(NUM) as NUM FROM STUDENT WHERE ID IS NOT NULL  GROUP BY NAME ")
                //.MergeTable()//将结果集合并到一个集合
                //.Select(dr => new { num = Convert.ToInt32(dr["NUM"]), name = dr["NAME"].ToString(), count = Convert.ToInt32(dr["COUNT"]) })
                //.GroupBy(dr => dr.name).Select(dt => new { name = dt.First().name, count = dt.Sum(dtItem => dtItem.count), num = dt.Sum(dtItem => dtItem.num) / dt.Sum(dtItem => dtItem.count) }).ToList();

                // //再简化
                // List<V_Student> groupList3 = db.Taskable<V_Student>("SELECT name,COUNT(*) AS [count],AVG(num) as num FROM STUDENT WHERE ID IS NOT NULL  GROUP BY NAME ")
                //.MergeEntities()//将结果集合并到一个集合
                //.GroupBy(dr => dr.name).Select(dt => new V_Student { name = dt.First().name, count = dt.Sum(dtItem => dtItem.count), num = dt.Sum(dtItem => dtItem.num) / dt.Sum(dtItem => dtItem.count) }).ToList();

                //更多简化函数
                int maxValue = db.Taskable<int>("SELECT max(NUM) FROM STUDENT").Max();//求出所有节点的最大值
                int minValue = db.Taskable<int>("SELECT min(NUM) FROM STUDENT").Min();//求出所有节点的最小值
                var dataCount = db.Taskable<int>("SELECT count(1) FROM STUDENT").Count();//求出所有节点数据
                // var avg = db.TaskableWithCount<int>("SELECT avg(num)", " FROM STUDENT").Avg();
                var all = db.Taskable<student>("select * from student where Contains(name,@name)"/*使用contains需要建全文索引*/, new { name = "张三" }).ToList();//获取所有节点name为张三的数据,转为list

                var dnSingle = DateTime.Now;
                var data = db.Taskable<student>("select * from student where id=@id", new { id = id }).ToSingle();//从所有节点中查询一条记录
                var timeSingle = (DateTime.Now - dnSingle).TotalSeconds;

                var dn = DateTime.Now;
                //单列排序
                //  var list = db.TaskableWithPage<student>("id", "select * from student    "/*使用contains需要建全文索引*/, 2160, 25, ref pageCount, "num", OrderByType.desc, new { name = "\"*李*\"" });
                var time = (DateTime.Now - dn).TotalSeconds;

                //多组排序 order by num,time
                var dn2 = DateTime.Now;
                var listMultipleOrderBy = db.TaskableWithPage<student>("id", "select * from student   "/*使用contains需要建全文索引*/, , , ref pageCount, new List<OrderByDictionary>() {
                     new   OrderByDictionary(){ OrderByField="num", OrderByType=OrderByType.asc},
                     //       new   OrderByDictionary(){ OrderByField="createTime", OrderByType=OrderByType.desc},
                   //  new OrderByDictionary(){ OrderByField="createTime", OrderByType=OrderByType.asc}
                }, new { name = "\"*小*\"" });
                var time2 = (DateTime.Now - dn2).TotalSeconds;

            }
        }
        /// <summary>
        /// 测试类
        /// </summary>
        public class student
        {
            public Guid id { get; set; }
            public string name { get; set; }
            public DateTime createTime { get; set; }
            public int num { get; set; }
        }
        /// <summary>
        /// 获取数据库连接对象
        /// </summary>
        public class CloudDao
        {
            private CloudDao() { }
            public static CloudClient GetInstance()
            {
                return new CloudClient(new List<CloudConnectionConfig>() {
                 new CloudConnectionConfig(){  ConnectionString=ConfigurationManager.ConnectionStrings["c1"].ToString(), Rate=},
                 new CloudConnectionConfig(){  ConnectionString=ConfigurationManager.ConnectionStrings["c2"].ToString(), Rate=},
                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["c3"].ToString(), Rate=},
                 new CloudConnectionConfig(){  ConnectionString=ConfigurationManager.ConnectionStrings["c4"].ToString(), Rate=},
                 new CloudConnectionConfig(){  ConnectionString=ConfigurationManager.ConnectionStrings["c5"].ToString(), Rate=},
                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["c6"].ToString(), Rate=},
                 new CloudConnectionConfig(){  ConnectionString=ConfigurationManager.ConnectionStrings["c7"].ToString(), Rate=},
                 new CloudConnectionConfig(){  ConnectionString=ConfigurationManager.ConnectionStrings["c8"].ToString(), Rate=},
                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["c9"].ToString(), Rate=},
                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["c10"].ToString(), Rate=},
                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["c15"].ToString(), Rate=},
                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["c16"].ToString(), Rate=},
                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["c17"].ToString(), Rate=},
                //new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["cy1"].ToString(), Rate=1},
                //   new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["cy2"].ToString(), Rate=1},
                //    new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["cy3"].ToString(), Rate=1},
                //                      new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["zq1"].ToString(), Rate=1},
                //   new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["zq2"].ToString(), Rate=1},
                //    new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["zq3"].ToString(), Rate=1},
                //            new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["qp1"].ToString(), Rate=1},
                //   new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["qp2"].ToString(), Rate=1},
                //    new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["qp3"].ToString(), Rate=1},
                //                 new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["wy1"].ToString(), Rate=1},
                //   new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["wy2"].ToString(), Rate=1},
                //    new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["wy3"].ToString(), Rate=1},
                //                                   new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["wwf1"].ToString(), Rate=1},
                //   new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["wwf2"].ToString(), Rate=1},
                //    new CloudConnectionConfig(){ ConnectionString=ConfigurationManager.ConnectionStrings["wwf3"].ToString(), Rate=1},

            });
            }
        }
    }
}

19添加VS知能提示，让你立马上手。

http://www.cnblogs.com/sunkaixuan/p/5851425.html

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所有版本

ASP.NET 4.0+ MSSQL https://github.com/sunkaixuan/SqlSugar

ASP.NET CORE MSSQL https://github.com/sunkaixuan/ASP_NET_CORE_ORM_SqlSugar

ASP.NET 4.0+ MYSQL https://github.com/sunkaixuan/MySqlSugar

ASP.NET CORE MYSQL https://github.com/sunkaixuan/ASP_NET_CORE_ORM_MySqlSugar

ASP.NET 4.0+ Sqlite https://github.com/sunkaixuan/SqliteSugar

ASP.NET CORE Sqlite https://github.com/sunkaixuan/ASP_NET_CORE_ORM_MySqlSugar

ASP.NET 4.0+ ORACLE https://github.com/sunkaixuan/OracleSugar