EF miscellaneous

Context.Entry<Job>(job).State = System.Data.Entity.EntityState.Modified;// to update 
//Job type 
//job object 

EF Timeout problem 
// Connection timeout 
Connection Timeout=60;// Add to the connection string 

// Execution timeout 
_test.Database.CommandTimeout = 180;

EF Handle   In the database  null The problem of

var query=from f in db.tb_flag
where Nullable<int>.Equals(f.flag,null) select f; 

// Generated SQL Statement for  where flag is null

 

// Write the connection string in the program

        public Context()// Write the corresponding information directly in the constructor of the context , Then you can delete app.config/web.config
            : base("server=WAYLIPC;database=Programme;uid=sa;pwd=1987214li;")
        {
        }

//linq Include lookup

  List<CodeFirst.ProductReCord> tt = _context.ProductReCords.Where(o => new int[] { 1, 2,3,4,5,6  }.Contains(o.Id)).ToList();
//==sql
SELECT * FROM	 dbo.ProductReCord WHERE Id IN (1,2,3,4,5,6)

//Linq Fuzzy search

     var ct=_context.ProductReCords.Where(o => o.FileName.StartsWith("a") && o.FileName.EndsWith("t")&&o.FileName .Contains("abc")).Select(o=>new {o.Id,o.FileName,o.JobNum ,o.Check_Sum});
//StartsWith   Match start string     a%
//EndsWith     Match end string     %a
//Contains     contain   %a%     
           Here is sql
SELECT 
    [Extent1].[Id] AS [Id], 
    [Extent1].[FileName] AS [FileName], 
    [Extent1].[JobNum] AS [JobNum], 
    [Extent1].[Check_Sum] AS [Check_Sum]
    FROM [dbo].[ProductReCord] AS [Extent1]
    WHERE ([Extent1].[FileName] LIKE 'a%') AND ([Extent1].[FileName] LIKE '%t') AND ([Extent1].[FileName] LIKE '%abc%')