- Can we write queries in dbvisualizer how to#
- Can we write queries in dbvisualizer install#
- Can we write queries in dbvisualizer code#
- Can we write queries in dbvisualizer series#
AddNewtonsoftJson(o => o.SerializerSettings.ReferenceLoopHandling = Options => options.MigrationsAssembly("EFCoreApp"))) Opts.UseSqlServer(Configuration.GetConnectionString("sqlConnection"), Public void ConfigureServices(IServiceCollection services)
Can we write queries in dbvisualizer install#
In the next example, we are going to return only one student with all the related evaluations, to show how the Include() method works:īefore we send request to execute this query, we should install the library and modify the Startup.cs class: It does that by using two different methods Include() and ThenInclude(). With the Eager Loading approach, EF Core includes the relationships in the query result. Relational Database Queries with Eager Loading in EF Core
![can we write queries in dbvisualizer can we write queries in dbvisualizer](https://tableplus.com/assets/images/dbvisualizer-alternative/table-data-mysql.png)
So, it doesn’t matter if our Student object has navigational properties because, with the query like the one we’ve written above, they won’t be included.Īs a result of our query, the navigational property values are null: It is important to know that EF Core will include relationships in the result only if explicitly asked for. We are going to talk more about each of them in this article. There are different approaches to retrieve our data: For now, just know that EF Core won’t track changes (when we apply AsNoTracking) on the loaded entity which will speed up the query execution:ĭifferent Ways of Building Relational Queries In the next article, we are going to talk about how EF Core modifies data in the database and track changes in the loaded entity. TIP: When we write only read-only queries in Entity Framework Core(the result of the query won’t be used for any additional database modification), we should always add AsNoTracking method to speed up the execution. Finally, we have ToList() method which executes this query. Where(s => s.Age > 25)“ is a second part of the query where we use a LINQ command to select only required rows. The “ _context.Students” is the first part where we access the Student table in the database via the DbSet Students property. Therefore let’s inject our context object in the Values constructor and write a first query in the Get action: įrom this query, we can see all the mentioned parts. If you want to learn more about ASP.NET Core Web API, we strongly recommend reading our ASP.NET Core tutorial. We are going to focus on the EF Core’s logic, not on Web API overall.
Can we write queries in dbvisualizer series#
So, to explain the query basics, we are going to use the Values controller, as we did in the first part of the series and only the Get action for the sake of simplicity. The second part is used often, but sometimes it can be skipped if we want to return all the rows from a table we are connecting to via the DbSet property.
![can we write queries in dbvisualizer can we write queries in dbvisualizer](https://solr.apache.org/guide/6_6/images/solr-jdbc-dbvisualizer/dbvisualizer_solrjdbc_19.png)
To see all the basic instructions and complete navigation for this series, visit Entity Framework Core with ASP.NET Core Tutorial.īefore we start with the next section of this article, we suggest downloading the starting project, adjusting the connection string, and running it.
Can we write queries in dbvisualizer code#
You can download the source code for this article on our GitHub repository.
Can we write queries in dbvisualizer how to#
We are going to learn how to access the database via EF Core and how to read the data from it by using different query approaches. So, in this one, we are going to populate our additional tables with data and start writing some queries. In previous articles, we have already created and prepared the database with the required configuration.
![can we write queries in dbvisualizer can we write queries in dbvisualizer](https://gdm-catalog-fmapi-prod.imgix.net/ProductScreenshot/287bb76b-0d67-4f53-bb83-0c2479acfcfe.png)
In this chapter, we are going to talk about Queries in Entity Framework Core.