programming entity framework code first

Description of Entity notes corresponding to the automatic association query and automatic association update navigation properties of Entity Framework, entityframework I. First, I want to know about the automatic association query of Entity Framework: Automatic association

Entity Framework object Framework formation tour-several typical operations on the interface (8), entityframework In the previous article, "The Journey of Entity Framework formation -- separation and combination of data transmission model DTO and

Tags: event div sop ase Lap span onclick parent class interface1. Create an Entity Data Model using DB Frist modeDb Frist Create an Entity Data model (creating an EDMX is not the point, you can do it randomly), here named Zerocodedb, the resulting documents; Where the red box of the file (ZEROCODEDB.TT) is the entity's generated key code, that is, entity's T4 tem

Install Entity Framework Power Tools, 2015 entity on Visual Studio 2015 Entity Framework Power Tools is a very useful EF Code First plug-in. It allows you to easily generate model and dbcontext

Framework has been integrated into. Net since. Net 3.5. The latest version is Entity Framework 5.0. Version Support for. net Release status Remarks Entity Framework 3.5 2.0 + Included in. Net 3.5 Supports edmx generation and po

Entity Framework 6 Recipes 2nd Edition (9-5) Translation-> delete a disconnected Entity, entityrecipes 9-5. delete a disconnected entity Problem We need to delete the object retrieved from WCF. Solution Let's assume that we have the payment and Bill model of the entity as sh

Entity SQL is the SQL class language provided by the Ado.net Entity Framework to support the Entity Data Model (EDM). Entity SQL can be used for object queries and queries executed using the EntityClient provider. L Key Words Value keyword ESQL provides a SELECT value cla

If lazy loading enable = true is not set in the Entity Framework, the handler must handle the loading of the metadata, for example, using load or include, however, because the include parameter number is string, it is very difficult for a person to find the parameter easily after tablename is changed with string, so I want to introduce an extension method. // Adventureworkslt2008r2entities context = new adv

create entity models using code. Code first can map to an existing database or generate a database from the model. integrates well into all. NET application programming models including ASP. net, Windows Presentation Foundation (WPF), Windows Communication Foundation (WCF), and WCF data services (formerly ADO. ne

first analyzes the difficulties and complex business logic of the core links of Internet manufacturers, and the concept of middle-range service, and then takes you to the advanced features of the concurrent programming framework disruptor, including serial parallelization operations, diamond operations, polygon operations and deep parsing of the underlying code,

Validate EntityYou can write the custom server side validation for any entity. To accomplish this, override validateentity method of DBContext as shown below.protected OverrideSystem.Data.Entity.Validation.DbEntityValidationResult validateentity (Dbentityentry entityentry, system.collections.generic.idictionaryObject,Object>items) { if(entityentry.entity isStudent) { if(entityentry.currentvalues.getvaluestring> ("Studentname") =="") {

) Hibernate in the batch data processing is a disadvantage. (2) For an object (a single object) simple check change \ delete increase, not batch modification, deletion, suitable for using Hibernate, and for batch modification, deletion, not suitable for hibernate, which is also the weakness of the or framework; To use a specific optimization mechanism for a database, Not suitable for hibernate. Entity

By default, only the reference of the LINQ assembly is added to Web. config generated in MVC. If Entity Framework (EF) is used as the orm of MVC, you need to add the Assembly reference in webconfig: For example: ...... Asp.net MVC 2 cocould not load type 'System. Web. MVC. viewpage If problems such as cocould not load type 'System. Web. MVC. viewpage Code

concurrency, you can use database locks, known as pessimistic concurrency. For example, when you read a record from a database, you can lock it to read-only or update the state. If you lock a record to an updated state, other users will not be able to lock the record again, whether it is a read or update operation. If you lock a record as read-only, other people can lock it as read-only, but not update the operation.Management locks also have drawbacks, which can lead to more complex

Designer.cs file because your changes will be overwritten the next time you use the Entity Designer. If you want to extend the functionality of the entity classes defined in Designer.cs, you can create a partial class in a separate file.4. Use the Entity Framework to select Database recordsLet's start building our mov

the Solution Explorer window.Note: do not modify the code in the Designer.cs file because your changes will be overwritten the next time you use the Entity Designer. If you want to extend the functionality of the entity classes defined in Designer.cs, you can create a partial class in a separate file.4. Use the Entity

Before writing the data Layer D layer when there are many SQL statements, how to omit the tedious SQL statements, Microsoft provides a good way-Entity Framework-entity framwork. An object mapping mechanism that supports. NET developers use domain-specific objects to come out of relational data, eliminating the need for most of the data access

), the Fix-up will also ensure that the customer. Orders attribute contains those Orders. This is the real reason why Include ("Orders") is not used in my query. This avoids the problem and leads to a new problem: Can Customer. Orders be sorted? Unfortunately, there is no official solution. This is not a feature we want to support. We don't have to spend time-we need to test it to make sure it works in every scenario. You know that is an important QA issue. Although there are opponents, this can

Although Java does not have the dynamic language like the violence, but still days, water to produce many framework technology---reflection (reflection), generics (generics), meta-data (annotation), proxies (proxy/cglib), Code dynamic Generation ( ASM), AOP (AspectJ), Dynamic language embedding (Groovy/javascript/beanshell). In the face of these, we like the overnight rich farmers, a little helpless look.Re

. This is roughly the prototype of our ORM implementation. Of course, what we mentioned above, these frameworks, such as Linq to SQL or Entity Framework, have already helped us implement them. We only need to use the methods they provide. From here, we can also see that if we use these frameworks, when programming, our programmers almost don't need to manage thin