//可以直接用SimpleClient也可以扩展一个自个的类 //推荐直接用 SimpleClient //为了照顾需要扩展的朋友，我们就来扩展一个SimpleClient，取名叫DbSetpublic class DbSet<T> : SimpleClient<T> where T : class, new(){public DbSet(SqlSugarClient context) : base(context){}//SimpleClient中的方法满足不了你，你可以扩展自已的方法/// <summary>/// 返回可迭代的/// </summary>/// <returns></returns>public ISugarQueryable<T> AsQueryable(){return Context.Queryable<T>();}/// <summary>/// 执行SQL语句/// </summary>/// <param name="sql"></param>/// <returns></returns>public ISugarQueryable<T> Sql(string sql){return Context.SqlQueryable<T>(sql);}}//创建一个DbContext类，使用DbSet(或者SimpleClient)public class DbContext{public DbContext(){Db = new SqlSugarClient(new ConnectionConfig(){ConnectionString = "Data Source = *; User ID = *; Password = *; ",DbType = DbType.Oracle,IsAutoCloseConnection = true,InitKeyType = InitKeyType.Attribute});////调式代码 用来打印SQL //Db.Aop.OnLogExecuting = (sql, pars) =>//{//    Console.WriteLine(sql + "\r\n" +//        Db.Utilities.SerializeObject(pars.ToDictionary(it => it.ParameterName, it => it.Value)));//    Console.WriteLine();//};
}public SqlSugarClient Db;//用来处理事务多表查询和复杂的操作public DbSet<DemoStudent> DemoStudentDb => new DbSet<DemoStudent>(Db);    }

  //  dbOracle.Classa.AsQueryable() 你可以不必每次都要去ToList转型

var datas = dbOracle.TManagementsinfos.AsQueryable().Where(x => x.Grouptype == 3 && x.Deptcode == "20107").Select(x => new{name = x.Managename,value = x.Username}).ToList();  //执行Sql语句      List<CcBusiAdviceview> data = dbContext.CcBusiAdviceviews.Sql(sql).ToList();