Lerman Vvs14 Ef Tips And Tricks

Julie Lerman
Julie LermanSoftware Developer at Self Employed
VVS14:Entity Framework Tips & Tricks,[object Object],Julie Lerman,[object Object],www.thedatafarm.com,[object Object],jlerman@thedatafarm.com,[object Object],twitter: @JulieLermanVT,[object Object]
Julie Lerman,[object Object],website,[object Object],theDataFarm.com,[object Object],blog & twitter,[object Object],theDataFarm.com/blog@julielermanVT,[object Object],book web site,[object Object],LearnEntityFramework.com,[object Object],consultant/mentor,[object Object],Microsoft MVP, INETA Speaker,ASPInsider, MCP, VTdotNET Leader,[object Object]
Tips & Tricks ,[object Object],Version 1 Pain Points Fixed in EF4,[object Object],Query Helpers,[object Object],Use ObjectQuery methods with LINQ to Entities,[object Object],Find Exception Handling Details,[object Object],Create Generic Queries,[object Object],Encapsulate Query Execution,[object Object],Improve Query Performance,[object Object]
!,[object Object],     V1 Model hides Foreign Key,[object Object]
Get FK value from Entity Reference,[object Object]
Set FK Value through Entity Ref,[object Object],from Single EntityKey Property,[object Object],Order.CustomerReference.EntityKey =,[object Object], new EntityKey("MyEntities.Customers", "PersonID", 1),[object Object],from Multiple EntityKey Properties,[object Object],vareKeyValues =,[object Object],     new KeyValuePair<string, object>[] {,[object Object],         new KeyValuePair<string, object>(“PropertyA", 12),,[object Object],         new KeyValuePair<string, object>(“PropertyB", 103),[object Object],         };,[object Object],EntityKey ekey= new EntityKey(“MyEntities", eKeyValues);,[object Object],instance.EntityRef.EntityKey=ekey;,[object Object]
     V1: Undesirable Store Queries,[object Object],LINQ to Entities Query,[object Object],From p In context.PeopleWhere p.LastName.StartsWith(“K"),[object Object],Resulting T-SQL Query,[object Object],SELECT  [Extent1].[PersonID] AS [PersonID],  ...,[object Object],WHERE (CAST(CHARINDEX(N'T', Extent1].[LastName]),[object Object],       AS int)) = 1,[object Object],!,[object Object]
Control Store Query with ESQL,[object Object],     Entity SQL,[object Object],SELECT VALUE p FROM EFEntities.People AS p,[object Object],WHERE p.LastName LIKE “T%”,[object Object],Query Builder Methodscontext.People.Where("it.LastName LIKE 'T%'"),[object Object],     Resulting T-SQL,[object Object],SELECT [Extent1].[PersonID] AS [PersonID], ,[object Object],WHERE [Extent1].[LastName] LIKE 'T%',[object Object]
Queries in Entity Framework 4,[object Object],Huge improvements to generated queries,[object Object],Contains added to LINQ to Entities & ESQL,[object Object],StartsWith, EndsWith,Contains LIKE %%,[object Object],Much More..,[object Object],See blogs.msdn.com/adonet,[object Object],August 5, 2009 post,[object Object]
Awesome Third Party Tools,[object Object],LINQPad,[object Object],Test Queries,[object Object],LINQ, L2S, L2E, ESQL,[object Object],EFProf,[object Object],Capture *All* ,[object Object],Database Activity,[object Object]
     V1: Random columns from Sprocs,[object Object],CREATE PROCEDURE OrdersBySalesPersonbyDate,[object Object],AS,[object Object],SELECT  MIN(Person.FirstName) as First, ,[object Object],               MIN(Person.LastName) as Last,,[object Object],              COUNT(OrderId) as OrderCount,[object Object],FROM …,[object Object],Requires lots of manual editing of the model, MSL and SSDL to create an entity that matches the return value,[object Object],!,[object Object]
Use Views in Place of Sprocs,[object Object],CREATE VIEW OrdersBySalesPersonbyDate,[object Object],AS,[object Object],SELECT  MIN(Person.FirstName) as First, ,[object Object],               MIN(Person.LastName) as Last,,[object Object],              COUNT(Orderid) as OrderCount,[object Object],FROM …,[object Object],Wizard creates all entity metadata elements ,[object Object],Other benefits,[object Object],View is composable,[object Object],Use in queries,[object Object],Change Tracking (use stored procs for Ins/Upd/Del),[object Object]
Stored Procs in Entity Framework 4,[object Object],Major support improvements,[object Object],Map functions to complex types,[object Object],Designer can discover result shapes and auto-create the complex types for you,[object Object]
Country Reference List,[object Object],List<Customer> GetCustomers()  ,[object Object],   {  return context.Customers.OrderBy(c => c.LastName),[object Object],                              .ToList(); },[object Object],Account Type Reference List,[object Object],  List<AccountType> GetAccountTypes()  ,[object Object],  {  return context.AccountTypes.OrderBy(a => a.TypeName),[object Object],                                .ToList(); },[object Object],Product Reference List,[object Object], List<Product> GetProducts()  ,[object Object],  {  return context.Products.OrderBy(p => p. Name),[object Object],                            .ToList(); },[object Object],!,[object Object],       Redundant L2E Queries,[object Object]
Build Reusable, Generic Queries,[object Object],public static List<TEntity> GetReferenceList<TEntity>,[object Object],   (this ObjectContext context),[object Object],context.GetReferenceList<Country>,[object Object],context.GetReferenceList(Of AccountType),[object Object],context.GetReferenceList<Product>,[object Object]
var query=from p in context.People select p;,[object Object],try,[object Object], { var people=query.ToList(); },[object Object],catch (EntityException),[object Object], { ... },[object Object],Catch (CommandExecutionException),[object Object], { ... },[object Object],var query2=from o in context.Orders select o;,[object Object],try,[object Object], { var orders =query2.ToList(); },[object Object],catch (EntityException),[object Object], { ... },[object Object],Catch (CommandExecutionException),[object Object], { ... },[object Object],!,[object Object],      Redundant code around queries,[object Object]
Encapsulate Query Execution,[object Object],Reusable Repository Methods,[object Object],public List<TEntity> ExecuteList<TEntity>,[object Object],   (ObjectQuery<TEntity> objectQuery),[object Object],public List<TEntity> ExecuteList<TEntity>,[object Object],  (IQueryable<TEntity> L2EQuery),[object Object],Calling Reusable Methods,[object Object],IEnumerable<Person> L2EQuery = from p in context.People,[object Object],                               select p;,[object Object],List<Person> people = dal.ExecuteList<Person>(L2EQuery);,[object Object],ObjectQuery oQuery = context.Orders;,[object Object],List<Order> orderList = dal.ExecuteList<Order>(oQuery);,[object Object]
s,[object Object],Order B,[object Object],?,[object Object],Person A,[object Object],Person B,[object Object],Order A,[object Object],db Error,[object Object],?,[object Object],Person D,[object Object],Order C,[object Object],?,[object Object],Order D,[object Object],Person C,[object Object],!,[object Object],UpdateExceptions Anonymity,[object Object]
ObjectStateEntry & Entity Instance provided in UpdateException,[object Object]
Pre-Compile L2E Queries,[object Object],Pre-Compiled Query,[object Object],LINQ to Entities,[object Object],Query,[object Object],Store,[object Object],Query,[object Object]
      Web Sites Lose      Pre-Compiled L2E Queries,[object Object],[object Object]
Pre-Compilation is repeated each time
App process loses benefit of pre-compilation
Big performance loss!,[object Object]
Cache Pre-Compiled Query Func,[object Object],Class Level Static Function,[object Object],static Func<MyEntities, IQueryable<Customer>> customerPCQ; ,[object Object],Class Constructor,[object Object],public CustomerProvider() ,[object Object],{,[object Object],  if (customerPCQ == null),[object Object],  {,[object Object],customerPCQ = CompiledQuery.Compile<MyEntities,,[object Object],                                        IQueryable<Customer>>,[object Object],                  (ctx => from cust in ctx.Customers,[object Object],                          where cust.Orders.Any(),[object Object],                          select cust,[object Object],                  ); ,[object Object],   },[object Object],}  ,[object Object]
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