entity framework 6 0

Entity Framework Code First Learning Series CatalogEntity Framework Code First Learning Series Description: Development environment for Visual Studio + Entity Framework 5.0+ms SQL Server 2012, database-side Entity

, EntityState. modified); // 4. update the database context // dbFirst. saveChanges (); # endregion # region Query DBFirstEntities dbFirst = new DBFirstEntities (); foreach (var item in dbFirst. t_Customer) {Console. writeLine (string. format ("ID: {0} Name: {1}", item. ID, item. cusName) ;}# region linq expression T_Customer cs = (from customer in dbFirst. t_Customer where customer. ID = 2 select customer ). singleOrDefault (); Console. writeLine ("I

DateTime hiredate {get; set;} Public virtual icollectionOpen Student.cs, make the same changesUsing system;using system.collections.generic;using system.componentmodel.dataannotations;using System.componentmodel.dataannotations.schema;namespace contosouniversity.models{public class Student:person { [DataType (datatype.date)] [DisplayFormat (dataformatstring = "{0:YYYY-MM-DD}", Applyformatineditmode = True)] [D

code:Region. Begin ("ObjectSet attribute", 2);foreach (EntitySet EntitySet in container. Baseentitysets.oftype{#>{get {return }Private ObjectsetChange to the following code, and save:Region. Begin ("ObjectSet attribute", 2);foreach (EntitySet EntitySet in container. Baseentitysets.oftype{String className = GetClassName (code. Escape (Entityset.elementtype), "Entity");String entitysetelementtype = GetClassName (code. Escape (Entityset.elementtype), "

I keep thinking about what the stored procedure can do for our applications in EF?. SP execution efficiencyI have seen the performance analysis report of the ado.net team on EF and the comparison of the performance of the LINQ to entity, esql, and SQL statements,ADO. NET Entity Framework Performance Comparison Exploring-the-performance-of-the-ado-net-

Spent 5, 6, and July on a busy day, and now take some time to make some basic memories of the use of the Entity Framework.What is the Entity Framework?The Entity Framework (EF), like our familiar ADO, provides objects for accessin

contains.There are a number of different compositing methods on this topic:Execute two separate queries: One query movie, one query reviews, and then the associated combination to complete the rest of the work.Perform a query as shown here to select multiple types.Sort associations – see Tip 1Once you understand how associative composition works, you can really make the most of it.Enjoy.tips. How to use code only in the Data Services Framework (. NET

still use Migration. The system separates this function and places it in the Microsoft. Data. Entity. Migration space. As for how to use it, I did not study it. In the past, when running, Entity Framework will automatically check whether the database exists. If it does not exist, it will automatically create a database and create corresponding tables and other c

, which clearly constitute a one-to-many relationship between them, so we first establish a lineitem class. 5) Add a lineitem class with the following code: Public class lineitem{Public int ID {Get; set ;}Public String productname {Get; set ;}Public double itemcost {Get; set ;}Public double units {Get; set ;}Public invoice {Get; set ;}} In this class, the reference to the invoice class is maintained, and the invoice class is also associated. 6

Framework basic Article 3 -- LINQ to entities Abstract: This section briefly introduces the query of LINQ to entities and the problems and precautions of some known LINQ to entities queries. Entity Framework learning elementary Article 4 -- Entity SQL summary: This section, will briefly introduce some

during runtime. Figure 1 Figure 2 Sing (VAR context = new efrecipesentities ()){String SQL = "select * from employee ";VaR Employee = context. executestorequery } For example, model and code, Figure 2 shows the exception information. 5. if the object has the complex type attribute, the instance of the object cannot be returned using executestorequery (), because excutestorequery () cannot return a set of complex types. it is supported to return a single c

condition contains. There are some different synthesis methods on this topic: Execute two independent queries: one query movie and one query reviews, and then let the association combination complete the rest of the work. Execute a select multiple types query as shown in this figure. Sort Association-see Tip 1 Once you understand how a link combination works, you can make full use of it. Enjoy. Tip 38.How to Use Code only in the Data Service F