SqlSugar 4.X

##Query Demo

   public class Query
    {

        public static void Init()
        {
            Easy();
            Page();
            Where();
            Join();
            Funs();
            Select();
            Ado();
            Group();
            Sqlable();
        }

        private static void Group()
        {
            var db = GetInstance();
            var list = db.Queryable<Student>()
                .GroupBy(it => it.Name)
                .GroupBy(it => it.Id).Having(it => NBORM.AggregateAvg(it.Id) > 0)
                .Select(it => new { idAvg = NBORM.AggregateAvg(it.Id), name = it.Name }).ToList();

            //SQL:
            //SELECT AVG([Id]) AS[idAvg], [Name] AS[name]  FROM[Student] GROUP BY[Name],[Id] HAVING(AVG([Id]) > 0 )
 
            //NBORM.AggregateSum(object thisValue) 
            //NBORM.AggregateAvg<TResult>(TResult thisValue)
            //NBORM.AggregateMin(object thisValue) 
            //NBORM.AggregateMax(object thisValue) 
            //NBORM.AggregateCount(object thisValue) 
        }

        private static void Ado()
        {
            var db = GetInstance();
            var t1= db.Ado.SqlQuery<string>("select 'a'");
            var t2 = db.Ado.GetInt("select 1");
            var t3 = db.Ado.GetDataTable("select 1 as id");
            //more
            //db.Ado.GetXXX...
        }

        public static void Easy()
        {
            var db = GetInstance();
            var getAll = db.Queryable<Student>().ToList();
            var getAllNoLock = db.Queryable<Student>().With(SqlWith.NoLock).ToList();
            var getByPrimaryKey = db.Queryable<Student>().InSingle(2);
            var getByWhere = db.Queryable<Student>().Where(it => it.Id == 1 || it.Name == "a").ToList();
            var getByFuns = db.Queryable<Student>().Where(it => NBORM.IsNullOrEmpty(it.Name)).ToList();
        }

        public static void Page()
        {
            var db = GetInstance();
            var pageIndex = 1;
            var pageSize = 2;
            var totalCount = 0;
            var page = db.Queryable<Student>().ToPageList(pageIndex, pageSize, ref totalCount);

            var pageJoin = db.Queryable<Student, School>((st, sc) => new object[] {
              JoinType.Left,st.SchoolId==sc.Id
            }).ToPageList(pageIndex, pageSize, ref totalCount);

            //top 5
            var top5 = db.Queryable<Student>().Take(5).ToList();

            //skip5
            var skip5 = db.Queryable<Student>().Skip(5).ToList();
        }
        public static void Where()
        {
            var db = GetInstance();
            //join 
            var list = db.Queryable<Student, School>((st, sc) => new object[] {
              JoinType.Left,st.SchoolId==sc.Id
            })
            .Where<School>(sc => sc.Id == 1)
            .Where<Student>(st => st.Id == 1)
            .Where<Student, School>((st, sc) => st.Id == 1 && sc.Id == 2).ToList();

            //SELECT [st].[Id],[st].[SchoolId],[st].[Name],[st].[CreateTime] FROM [Student] st 
            //Left JOIN School sc ON ( [st].[SchoolId] = [sc].[Id] )   
            //WHERE ( [sc].[Id] = @Id0 )  AND ( [st].[Id] = @Id1 )  AND (( [st].[Id] = @Id2 ) AND ( [sc].[Id] = @Id3 ))


            //Where If
            string name = null;
            string name2 = "sunkaixuan";
            var list2 = db.Queryable<Student>()
                 .WhereIF(!string.IsNullOrEmpty(name), it => it.Name == name)
                 .WhereIF(!string.IsNullOrEmpty(name2), it => it.Name == name2).ToList();
        }
        public static void Join()
        {
            var db = GetInstance();
            //join  2
            var list = db.Queryable<Student, School>((st, sc) => new object[] {
              JoinType.Left,st.SchoolId==sc.Id
            }).ToList();

            //join  3
            var list2 = db.Queryable<Student, School,Student>((st, sc,st2) => new object[] {
              JoinType.Left,st.SchoolId==sc.Id,
              JoinType.Left,st.SchoolId==st2.Id
            }).ToList();

            //join return List<ViewModelStudent>
            var list3 = db.Queryable<Student, School>((st, sc) => new object[] {
              JoinType.Left,st.SchoolId==sc.Id
            }).Select<Student,School,ViewModelStudent>((st,sc)=>new ViewModelStudent { Name= st.Name,SchoolId=sc.Id }).ToList();

            //join Order By (order by st.id desc,sc.id desc)
            var list4 = db.Queryable<Student, School>((st, sc) => new object[] {
              JoinType.Left,st.SchoolId==sc.Id
            })
            .OrderBy(st=>st.Id,OrderByType.Desc)
            .OrderBy<School>(sc=>sc.Id,OrderByType.Desc)
            .Select<Student, School, ViewModelStudent>((st, sc) => new ViewModelStudent { Name = st.Name, SchoolId = sc.Id }).ToList();
        }
        public static void Funs()
        {
            var db = GetInstance();
            var t1 = db.Queryable<Student>().Where(it => NBORM.ToLower(it.Name) == NBORM.ToLower("JACK")).ToList();
            //SELECT [Id],[SchoolId],[Name],[CreateTime] FROM [Student]  WHERE ((LOWER([Name])) = (LOWER(@MethodConst0)) )

            /***More Functions***/
            //NBORM.IsNullOrEmpty(object thisValue)
            //NBORM.ToLower(object thisValue) 
            //NBORM.string ToUpper(object thisValue) 
            //NBORM.string Trim(object thisValue) 
            //NBORM.bool Contains(string thisValue, string parameterValue) 
            //NBORM.ContainsArray(object[] thisValue, string parameterValue) 
            //NBORM.StartsWith(object thisValue, string parameterValue) 
            //NBORM.EndsWith(object thisValue, string parameterValue)
            //NBORM.Equals(object thisValue, object parameterValue) 
            //NBORM.DateIsSame(DateTime date1, DateTime date2)
            //NBORM.DateIsSame(DateTime date1, DateTime date2, DateType dataType) 
            //NBORM.DateAdd(DateTime date, int addValue, DateType millisecond) 
            //NBORM.DateAdd(DateTime date, int addValue) 
            //NBORM.DateValue(DateTime date, DateType dataType) 
            //NBORM.Between(object value, object start, object end) 
            //NBORM.ToInt32(object value) 
            //NBORM.ToInt64(object value)
            //NBORM.ToDate(object value) 
            //NBORM.ToString(object value) 
            //NBORM.ToDecimal(object value) 
            //NBORM.ToGuid(object value) 
            //NBORM.ToDouble(object value) 
            //NBORM.ToBool(object value) 
            //NBORM.Substring(object value, int index, int length)
            //NBORM.Replace(object value, string oldChar, string newChar)
            //NBORM.Length(object value) { throw new NotImplementedException(); }
            //NBORM.AggregateSum(object thisValue) 
            //NBORM.AggregateAvg<TResult>(TResult thisValue)
            //NBORM.AggregateMin(object thisValue) 
            //NBORM.AggregateMax(object thisValue) 
            //NBORM.AggregateCount(object thisValue) 
    }
        public static void Select()
        {
            var db = GetInstance();
            db.IgnoreColumns.Add("TestId", "Student");
            var s1 = db.Queryable<Student>().Select(it => new ViewModelStudent2 { Name = it.Name, Student = it }).ToList();
            var s2 = db.Queryable<Student>().Select(it => new { id = it.Id, w = new { x = it } }).ToList();
            var s3 = db.Queryable<Student>().Select(it => new { newid = it.Id }).ToList();
            var s4 = db.Queryable<Student>().Select(it => new { newid = it.Id, obj = it }).ToList();
            var s5 = db.Queryable<Student>().Select(it => new ViewModelStudent2 { Student = it, Name = it.Name }).ToList();
        }

        private static void Sqlable()
        {
            var db = GetInstance();
            var join3 = db.Queryable("Student", "st")
                          .AddJoinInfo("School", "sh", "sh.id=st.schoolid")
                          .Where("st.id>@id")
                          .AddParameters(new { id = 1 })
                          .Select("st.*").ToList();
          //SELECT st.* FROM [Student] st Left JOIN School sh ON sh.id=st.schoolid   WHERE st.id>@id 
        }


        public static SqlSugarClient GetInstance()
        {
            SqlSugarClient db = new SqlSugarClient(new SystemTableConfig() { ConnectionString = Config.ConnectionString, DbType = DbType.SqlServer, IsAutoCloseConnection = true });
            db.Ado.IsEnableLogEvent = true;
            db.Ado.LogEventStarting = (sql, pars) =>
            {
                Console.WriteLine(sql + "\r\n" + db.RewritableMethods.SerializeObject(pars));
                Console.WriteLine();
            };
            return db;
        }
    }