EF LINQ Miscellany

            var ccc = (from o in Context.BoxLogs
                       join oo in Context.Jobs
                       on o.JobId equals oo.Id
                       join ooo in Context.PositionInfoes
                       on o.PositionId equals ooo.SortNum
                       join o4 in Context.Lines
                      on o.LinId equals o4.LineId
                      into re    // Zodiac 
                       from r in re.DefaultIfEmpty()
                       where oo.JobNumber.Equals(jobName)
                       select new
                       {
                           oo.JobNumber,
                           ooo.PostionName,
                           o.FullBoxSn,
                           r.LineName,
                           Status = o.IsComplete == true ? " Already used ": " not used "  //linq case when
                       }).ToList();
// Find the station through the work order ,Sn, Line type , And use status 

            // BoxLog Is a database entity 
            //PositionInfo Is a database entity 
            var tt = Context.BoxLogs.Join(Context.PositionInfoes, (BoxLog o) => o.PositionId, (PositionInfo p) => p.SortNum, (o, oo) => new
            {
                o.PositionId,
                oo.PostionName
            }).ToList();

//EF Write in SQL sentence

This is search

            string sn = "G8T1GH000402PXJD";
            using (EF.RecordTest test = new EF.RecordTest())
            { 
string sql = "SELECT * FROM	 dbo.ims_success_logfiles WHERE test_type_name LIKE '" + sn + "%' AND Rework_Clear_Flag IS NULL";
 //List<EF.ims_success_logfiles> cct = test.ims_success_logfiles.SqlQuery(sql).ToList();
 Find that the upper one is slower than the lower one 
   List<EF.ims_success_logfiles> ccc=    test.Database.SqlQuery<EF.ims_success_logfiles>(sql).ToList();
            }
// Use it directly QSL Statement and the following sql The sentence is the same .
  SELECT * FROM	 dbo.ims_success_logfiles WHERE test_type_name LIKE 'G8T1GH000402PXJD%' AND Rework_Clear_Flag IS NULL

The following example is to update , Add and delete