entity framework sqlite

　　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

/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

This article describes how to use entiity framework to add, delete, modify, and query data in SQL Server. The database used in this article is the previous one.ArticleCreated in model-first development mode. Of course, you also need to download Visual Studio 2010 to open the project file of the previous article. Download link of the project file: Click to download. Step 1: Modify the database in the first article In the first article, we used E

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

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

When working with Entity Framework entities, most of the time we operate on entity model entities, a combination of database manipulation contexts that can be easily implemented using a variety of convenient means, such as LINQ, and everything looks good. However, if you consider using WCF, you may encounter a number of related traps or errors. Because the object

Label:About VS2013 link MySQL EF6 Many of the online statements are broadly consistent, but the specific process may have some problems Comprehensive longitudinal said, refining a few points: 1. Install Mysql-for-visualstudio-1.2.3.msi (required) 2. Install Mysql-connector-net-6.9.4.msi (required) 3. Install the EF Install command (install-package entityframework) using the NuGet Packages Package Manager, note: Which project is installed and automatically adds App. config under the project after

Preface Before going into the details of the object framework, we will first discuss the convenience of data access from the traditional dataset Method to the object-based method, and how these two methods work differently to lead to the use of O/RM tools like Entity Framework. Use dataset and datareader as data containers Let's first look at an example. Su

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

Any Android application without the operation of the database, even the client program will have some specific data into the database, such as: User browsing records, Favorites list and so on, so the database operation is a very frequent operation, so the encapsulation of this part is very necessary, The Web side has a series of excellent frameworks such as Hibernate, although the Android application also has some open-source oom framework on git, but

the set. In this query, the set is the entity set contacts, but it is also necessary to specify entitycontainer in the Entity SQL. Again, C is the name of any variable used in the query, representing the contact item in the contacts object set. The where clause in the SQL entity uses the SQL-like syntax as follows: Where C. firstname = 'rebort' Standard Funct

In the RAFY domain Entity Framework, the self-associated entity structure has been specially processed, and this function is explained below. Scene When you develop a database application, you often encounter scenarios in which you have self-correlating tables. For example, classification information, organizational structure of the Department, folder

that determines the name of the generated object, including the foreign key column in the Model check box When you click Finish, the wizard generates a model with three tables and a view. The wizard reads the FOREIGN KEY constraint from the database and deduces a one-to-many relationship between poet and poem (s), as well as a a-to-many relationship between meter and poem (s). Figure 2-9 Conceptual model Figure 2-9 shows a model that contains table poet,poem and meter, view vwlibrary. Now you

the name of the generated object, including the foreign key column in the Model check boxWhen you click Finish, the wizard generates a model with three tables and a view. The wizard reads the FOREIGN KEY constraint from the database and deduces a one-to-many relationship between poet and poem (s), as well as a a-to-many relationship between meter and poem (s).Figure 2-9 Conceptual modelFigure 2-9 shows a model that contains table poet,poem and meter, view vwlibrary.Now you have a model that you

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