Can we use multiple database in Entity Framework?

Can we use multiple database in Entity Framework?

Multiple DbContext was first introduced in Entity Framework 6.0. Multiple context classes may belong to a single database or two different databases.

Can a project have multiple databases?

While there are many ways to approach this, the most simple way to approach this is by creating multiple databases (schemas), where each project only has access to its own, separate database.

Can we have multiple DbContext in Entity Framework?

In code first, you can have multiple DBContext and just one database. You just have to specify the connection string in the constructor. Yes you can, but how can you query from different entities from different db contexts?

Can we have more than one DbContext?

Use the ‘-Context’ parameter for PowerShell commands and the ‘–context’ parameter for dotnet commands. More than one DbContext was found. Specify which one to use. Use the ‘-Context’ parameter for PowerShell commands and the ‘–context’ parameter for dotnet commands.

Does Entity Framework work with all databases?

EF Core works with many databases, including SQL Database (on-premises and Azure), SQLite, MySQL, PostgreSQL, and Azure Cosmos DB.

How can I use multiple databases in a single ASP NET project?

Solution 1

1. Add connection string for centralized db in web.
2. Store user specific connection string in user login details table in another column or in another table.
3. During user log in get user data with specific connection string & store it in session.

Can we use two databases in single project?

Generally, if one project consumes multiple databases, it is because it must consume different, often legacy sources of information that originated outside of this particular project. This is most common in Enterprise environments.

Is it better to have multiple databases?

it is better to use different database for each client. Maintaining multiple databases is difficult. For example if we want to modify a table then we should do changes in all databases. Grouping of data into multiple databases each with a significantly fewer number of tables.

What is the advantage of Entity Framework over ADO Net?

In ADO.Net, it performs bulk data SQL operations and reporting. On the other hand, the entity framework performs the CRUD operations in a project. 9. It is more flexible in terms of raw SQL queries and procedures because it has more control on the database.

What is a DbContext class?

The DbContext class is an integral part of Entity Framework. An instance of DbContext represents a session with the database which can be used to query and save instances of your entities to a database. DbContext is a combination of the Unit Of Work and Repository patterns.

Why you should not use Entity Framework?

One of the biggest reasons not to use Entity Framework Core is that your application needs the fastest possible data access. Some applications do a lot of heavy data operations with very high-performance demands, but usually business applications don’t have that high of a performance demand.

Is Dapper better than Entity Framework?

Dapper is literally much faster than Entity Framework Core considering the fact that there are no bells and whistles in Dapper. It is a straight forward Micro ORM that has minimal features as well. It is always up to the developer to choose between these 2 Awesome Data Access Technologies.

How do you communicate with multiple database in single application?

If you can work with single database, working with multiple is no different. You will need a connection string for each database. There rest is, as they say it, history.

How does multiple database connection and repository pattern work?

1 Answer

1. Create a dbContext concrete class for each database. Both inheriting from EF DbContext.
2. In config file, create a connection string key for each database. This key is then supplied to each dbContext class as ctr param.
3. Each database must have its own repositories.

Is it good to have multiple databases?

Good reasons to create separate databases would be to support different availability requirements or simplify administration. For example if your databases require very different backup schedules or different recovery models. Another reason would be if you may want to run them on different instances.

Why do organizations often have several databases?

Why do organizations create multiple databases? First, because of resource limitations, organizations fund development of their information systems one application at a time. Second, organizations may acquire some of their information systems from outside vendors.

Can you have multiple databases on one server?

Database consolidation is the process of centralizing multiple databases and instances in order to share resources and thus, among other, cut licensing and hardware costs. There are three types of consolidation: Host multiple databases on a single SQL Server instance.

What is the disadvantages of Entity Framework?

Lazy loading is the main drawbacks of EF. Its syntax is complicated. Its logical schema is not able to understand business entities and relation among each other. Logical schema of database is not capable of using certain parts of application.

Should I use LINQ or Entity Framework?

If your database is straightforward and simple, LINQ to SQL will do. If you need logical/abstracted entities on top of your tables, then go for Entity Framework. Entity Framework allows for a layer of abstraction of top of the database.

What is the difference between ObjectContext and DbContext?

DbContext is nothing but a ObjectContext wrapper, we can say it is a lightweight alternative to the ObjectContext….ObjectContext VS DBContext.