//---------Queryable<T>,扩展函数查询---------////针对单表或者视图查询//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 == 1);//查询单条没有记录返回空对象var single2 = db.Queryable<Student>().Where(c => c.id == 1).SingleOrDefault();//查询第一条var first = db.Queryable<Student>().Where(c => c.id == 1).First();var first2 = db.Queryable<Student>().Where(c => c.id == 1).FirstOrDefault();//取10-20条var page1 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(10).Take(20).ToList();//上一句的简化写法，同样取10-20条var page2 = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).ToPageList(2, 10);//查询条数var count = db.Queryable<Student>().Where(c => c.id > 10).Count();//从第2条开始以后取所有var skip = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Skip(2).ToList();//取前2条var take = db.Queryable<Student>().Where(c => c.id > 10).OrderBy(it => it.id).Take(2).ToList();// Not like string conval = "a";var notLike = db.Queryable<Student>().Where(c => !c.name.Contains(conval.ToString())).ToList();//Likeconval = "三";var like = db.Queryable<Student>().Where(c => c.name.Contains(conval)).ToList();// 可以在拉姆达使用 ToString和 Convert,比EF出色的地方var convert1 = db.Queryable<Student>().Where(c => c.name == "a".ToString()).ToList();var convert2 = db.Queryable<Student>().Where(c => c.id == Convert.ToInt32("1")).ToList();// var convert3 = db.Queryable<Student>().Where(c => DateTime.Now > Convert.ToDateTime("2015-1-1")).ToList();var convert4 = db.Queryable<Student>().Where(c => DateTime.Now > DateTime.Now).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>100").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falsebool isAny100 = db.Queryable<Student>().Any(c => c.id == 100);bool isAny1 = db.Queryable<Student>().Any(c => c.id == 1);//获取最大Idobject 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<Student, int>("id"); //字符串写法//获取最小int minId1 = db.Queryable<Student>().Where(c => c.id > 0).Min(it => it.id).ObjToInt();//拉姆达int minId2 = db.Queryable<Student>().Where(c => c.id > 0).Min<Student, 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//Invar intArray=new []{"5", "2", "3"};var intList = intArray.ToList();var list0 = db.Queryable<Student>().In(it => it.id, 1,2,3).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();//分组查询var list7 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select("sex,Count=count(*)").ToDynamic();var list8 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).GroupBy(it=>it.id).Select("id,sex,Count=count(*)").ToDynamic();List<SexTotal> list9 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy(it => it.sex).Select<Student, SexTotal>("Sex,Count=count(*)").ToList();List<SexTotal> list10 = db.Queryable<Student>().Where(c => c.id < 20).GroupBy("sex").Select<Student, SexTotal>("Sex,Count=count(*)").ToList();//SELECT Sex,Count=count(*) FROM Student WHERE 1=1 AND (id < 20) GROUP BY Sex --生成结果

//转成listList<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 = 1 });//转成dynamicdynamic list3 = db.SqlQueryDynamic("select * from student");//转成jsonstring list4 = db.SqlQueryJson("select * from student");//返回intvar 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 = 1, p2 = 2 });//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");

//---------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.SelectToList<School/*新的Model我这里没有所以写的School*/>("st.*", new { id = 1 });//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", 1, 10);//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", 1, 10); //--------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 = 1 });var list2 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToJson("*", new { id = 1 });var list3 = db.Sqlable().From("student", "s").Join("school", "l", "s.sch_id", "l.id and l.id=@id", JoinType.INNER).SelectToDataTable("*", new { id = 1 });//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", 1, 10, new { id = 1 });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", 1, 10, new { id = 1 });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", 1, 10, new { id = 1 });//--------拼接-----//Sqlable sable = db.Sqlable().From<Student>("s").Join<School>("l", "s.sch_id", "l.id", JoinType.INNER);string name = "a";int id = 1;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 > 0){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",1,20, pars);

using (SqlSugarClient db = SugarDao.GetInstance()){var list2 = db.Queryable<Student>().Where(c => c.id < 10).Select(c => new classNew { newid = c.id, newname = c.name, xx_name = c.name }).ToList();//不支持匿名类转换,也不建议使用var list3 = db.Queryable<Student>().Where(c => c.id < 10).Select(c => new { newid = c.id, newname = c.name, xx_name = c.name }).ToDynamic();//匿名类转换var list4 = db.Queryable<Student>().Where(c => c.id < 10).Select("id as newid, name as newname ,name as xx_name").ToDynamic();//匿名类转换

using (SqlSugarClient db = SugarDao.GetInstance())//开启数据库连接{Student s = new Student(){name = "张" + new Random().Next(1, int.MaxValue)};db.Insert(s); //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)List<Student> list = new List<Student>(){new Student(){name="张"+new Random().Next(1,int.MaxValue)},new Student(){name="张"+new Random().Next(1,int.MaxValue)}};db.InsertRange(list); //批量插入}}

using (var db = SugarDao.GetInstance()){//指定列更新db.Update<School>(new { name = "蓝翔2" }, it => it.id == id);db.Update<School, int>(new { name = "蓝翔2" }, 1, 3, 12);db.Update<School, string>(new { name = "蓝翔2" }, new string[] { "1", "2" });//整个实体更新db.Update(new School { id = id, name = "蓝翔2" });db.Update<School>(new School { id = id, name = "蓝翔2" }, it => it.id == id);//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 = 0,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。}

using (var db = SugarDao.GetInstance()){//真删除db.Delete<School, int>(10);//注意主键必需为实体类的第一个属性db.Delete<School>(it => it.id > 100);db.Delete<School, string>(new string[] { "100", "101", "102" });//假删除//db.FalseDelete<school>("is_del", 100);//等同于 update school set is_del=0 where id in(100)//db.FalseDelete<school>("is_del", it=>it.id==100);}