entity framework insert

Entity Framework ArchitectureThe following figure shows the overall architecture of the Entity Framework. Let us now look at the architecture individually:EDM (Entity Data Model): EDM consists of three main parts-conceptual model, Mapping and Storage model.Conceptual Model:

No Entity Framework provider with the fixed name "System. Data. SqlClient" was found for issues encountered when using Entity Framework. Make sure that the provider is registered in the "entityFramework" section of the application configuration file. The provider is not found in ado. Problem description: The followin

Installing the Entity Framework EnvironmentThe Entity Framework 5.0 API is distributed in two locations, one can be found in the NuGet Package Manager, and one exists in the. NET Framework. NET Framework 4.0/4.5 contains the EF co

Entity Framework Power Tools:Entity Framework Power Tools (currently in Beta 3) has been released. EF Power Tools is useful mainly in reverse engineering and generating read-only Entity Data Model for Code-first.Download and install Power Tools from VisualstudiogalleryAfter installing it, when your right click on the C

What is the entity FrameworkWriting and managing ADO is a tedious and boring task. Microsoft provides an ORM framework called "Entity Framework" for your app to automate the management of your database.Microsoft has given the following definition to the Entity Framework:EF i

tables together to flatten them to provide a clearer perspective. When we query each poet's information through the Vwlibraties entity set, only one loop is needed. The output is slightly different because we repeat the poet's name in each poem. The last note in this example is that we did not insert poests,poems and meters through the view vwlibrary. Because in the vast majority of databases, views are re

　　Using MySQL connection in vs2013 entityframework often encounters this problem: your project references the latest Entity Framework, but the version-compatible Entity Framework Data provider required for the data connection cannot be found. Exit this wizard, install a compatible provider, rebuild your project, and th

statement to insert data into the underlying database. The output of code listing 2-2 is sent:Lord ByronDon Juan (anapestic tetrameter)Lewis CarrollThe hunting of the Shark (anapestic tetrameter)John MiltonParadise regained (iambic pentameter)Paradise Lost (iambic pentameter)Lewis CarrollThe hunting of the Shark (anapestic tetrameter)Lord ByronDon Juan (anapestic tetrameter)John MiltonParadise regained (iambic pentameter)John MiltonParadise Lost (iam

add such code in the User entityPublic virtual icollectionin the add such code in the User's constructorThis. Roles = new hashsetSimilarly, the role also contains multiple users, then the add such code to the Role entityPublic virtual icollectionin the add such code to the Role constructorThis. Users = new hashsetNext, we construct our inheritance from DataContext class of DbContext classpublic class datacontext:dbcontext{public DataContext () : Base ("DataContext") { } public

/article/details/41877301 introduction of quite detailed, I would like to remind you to remember your installation directory, will be used later.Question three:To get here, I thought I could build the model smoothly, and didn't expect this problem to occurFortunately, there are people on the internet who have the same problem, that is, the http://blog.csdn.net/niewq/article/details/41877301 of the great God aboveOverall, four steps:First, the Package Manager console, the Library installer packag

Entity Framework mappings to relational Relation Mapping (Entity Framework multi-to-Multi-link ing), entitymapping Generally, when we design a database, there will be two tables with many-to-many relationships. When the database has many-to-many relationships, we usually process them through intermediate join tables, s

the needs of the database, and data separation is difficult for applications to use. Designing an object model first is a top-down approach. The main advantage of top-down is that applications are almost independent from databases to shape their models. The disadvantage is that sometimes it may not be conducive to the organization of the database, and may also lose performance. Databases are an important part of applications. Therefore, model design and database design should be seamlessly c

Label:3-4 using the Entity SQL query modelProblem 　　You want to query your Entity Data model and return strongly typed objects by executing an Entity SQL statement. Solution Solutions Suppose you have the model shown in Figure 3-5, which contains a customer entity type. This entity