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EntityMappers ; using Dapper. Models ; using System.Samsung j7 pro volte flash file
Linq ; using System. Tasks ; using Xunit ; namespace Dapper. Id ; Assert. Insert person. Execute db ; Assert. Insert email. Insert phone.
Insert " PersonEmail "personEmail. Insert " PersonPhone "personPhone. LeftJoin " PersonEmail personEmail on person.Time and time again I hear the same aspiration from front-end web and mobile developers: they're eager to reap the developer efficiency gains offered by new technologies like Relay and GraphQL, but they have years of momentum behind their existing REST API. Without data that clearly demonstrates the benefits of switching, they find it hard to justify an additional investment in GraphQL infrastructure.
No backend developers will be harmed during the making of this blog post. This schema will receive and resolve GraphQL queries all on the client side. This architecture features some inherent performance flaws, but is fast to implement and requires no server changes. Ultimately we will want to export a GraphQLSchema that we can use to resolve queries. At the root of all GraphQL schemas is a type called query whose definition we provide, and have specified here as QueryType.
This works everywhere except where the property names do not match the field name eg. Because we need to load from the network, we won't be able to return a value right away.
Luckily for us, resolve can return either a value or a Promise for a value. We can inject taion 's custom relay-local-schema network layer to resolve queries using the schema we just built. Put this code wherever it's guaranteed to be executed before you mount your Relay app. And that's that. Relay will send all of its queries to your custom client-resident schema, which will in turn resolve them by making calls to your existing REST API.
The client-side REST API wrapper demonstrated above should help you get up and running quickly so that you can try out a Relay version of your app or part of your app. However, as we mentioned before, this architecture features some inherent performance flaws because of how GraphQL is still calling your underlying REST API which can be very network intensive.
A good next step is to move the schema from the client side to the server side to minimize latency on the network and to give you more power to cache responses. Take the next 10 minutes to watch me build a server side version of the GraphQL wrapper above using Node and Express. The schema we developed above will work for Relay up until a certain point — the point at which you ask Relay to refetch data for records you've already downloaded.How to fix sql server error code 3417
Relay's refetching subsystem relies on your GraphQL schema exposing a special field that can fetch any entity in your data universe by GUID. We call this the node interface. To expose a node interface requires that you do two things: offer a node id: String!
To do this, we'll use the globalIdField helper from graphql-relay. Another set of helpers from graphql-relay will give us a hand developing the node field.Learn GraphQL In 40 Minutes
Your job is to supply the helper two functions:. Next, we simply need to add the nodeInterface and the nodeField to our schema.A specification. The spec determines the validity of the schema on the API server. The schema determines the validity of client calls. Strongly typed. The schema defines an API's type system and all object relationships. A client can query the schema for details about the schema.
Nested fields let you query for and receive only the data you specify in a single round trip. An application layer. GraphQL is not a storage model or a database query language.
The graph refers to graph structures defined in the schema, where nodes define objects and edges define relationships between objects. The API traverses and returns application data based on the schema definitions, independent of how the data is stored. All calls are validated and executed against the schema. Use these docs to find out what data you can call:. Schema-defined types: scalarsobjectsenumsinterfacesunionsand input objects. You can access this same content via the Explorer Docs sidebar.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm using dapper to get result set from stored procedure into object list and return it to the client as json:. It works. The last property of object of type ProductPreview is TotalCount, since stored procedure returns total count as column of every row.
Having two separate queries is not an option. What would be the best way to return gridLines json object to client without totalCount property since it is overhead and read total count from stored procedure to some variable? Copy gridLines object to some other object without totalCount property would be also unnecessary overhead. You may want to approach this issue differently, since the requirement is to get a Result set and a countthen even though QueryMultiple helps, but that's better used for the multiple result setsin this case you can just plan to use Dynamic Parameterswhich can help you add the OutputParameternot just the InputParameter as you have done by default by using Anonymous type and on execution of conn.
Dapper allows you to process multiple result grids in a single query. Learn more. TotalCount for paging with dapper Ask Question. Asked 4 years ago. Active 2 years, 9 months ago. Viewed 3k times. Stefan Steinegger Simon Simon 1, 4 4 gold badges 23 23 silver badges 41 41 bronze badges. Active Oldest Votes. Add "Count",0,ParameterDirection. Mrinal Kamboj Mrinal Kamboj Thank you. Both solution works.
This one sounds more appropriate. ToList ; Void Ray Void Ray 7, 4 4 gold badges 25 25 silver badges 50 50 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.
Sign up using Email and Password.Yes and no! People are still arguing about it. Dapper has earned the title of king of the C Micro ORM but is considered by multiple people as a simple object mapper for.Osap estimator
People will prefer Dapper when they want to write the SQL query themselves with optimal performance. No, but a third-party library does: Dapper Plus. It's a prime library that extend Dapper with all bulk operations. Probably yes since Dapper provides extensions to the IDbConnection interface. It's your job to write the SQL compatible with your database provider. Yes, Dapper support transaction and every method that can use one have an optional parameter to specify it.
Is Dapper an ORM? Is Dapper better than Entity Framework? Do Dapper support Bulk Insert?
Learn More. Do Dapper support my database provider? Do Dapper support Transaction? Dapper - Execute Execute a command one or multiple times and return the number of affected rows.
Dapper - Execute Example.
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ToList ; FiddleHelper. Dapper - Query Execute a query and map the result. Dapper - Query Example. Dapper - Parameters Use parameter in your Dapper query. Anonymous Dynamic List String. Dapper - Parameter Example. Dapper - Result Map the query result to different types. Dapper - Result Example. ToList ; Console. WriteLine orderDetails. Count ; FiddleHelper.Currently, I have struggled with the problems that I have to implement many times the query for any entity in my data model.
I thought if we can expose all entities to the APIs or maybe have a way to limit some of the sensitive entitiesit would be great, and then others simply to query it like a generic query to avoid boilerplate code when we implemented over and over the query function for all entities in the system.
I spent a long time to have a look at OData project parser part actuallybut was not satisfied. Maybe because it is too complex and a lot of schemas are needed to be defined up-front.
And moreover, it is only used by. I wanted a solution that could work and adapt well to other ecosystems like front-end, mobile or maybe IoT devices can consume the data output easily. For more information about it, I highly recommend you to read this article The year in GraphQL. We can query from the front-end using gql DSL language and query every entity in your database. Because we do the prefix for the table in the database e.
We have the schema models on the codes it will be populated all the schema information of EfCore entities when the application started. This punch of code above will help the application to identify the data type and some of the query arguments like pagination, projection… See the final part of this article when I show you the result of the query.
To make the GraphQL understand the database schema that we want to populate, we need to create some of the revolvers as follows:. Have you seen the dynamic LINQ in the code above bold text colors. Thank you for System. Core lib, without it, we need to do a lot more work. And one more thing that makes the query of the assembly name as:. You can refer to this link for the solution. Now is the time we need to define the query for our application. There are two things to notice as follows:.
As you see above, we need to define 2 fields for each entity we have in the database. Let me show you the code:. We based on the schema that we got from previous steps to define the fields for the GraphQL query. Does it make sense to you so far? This final step of this article is to define the controller so that we can run the application.
It is really simple as shown below:. This is only a POC project so that I will have more refactoring in the future. Let's run it by pressing F5I will show you how it works.
All the source code can be found at CRMCore. If you like it, give me a star, then I will have more motivation to it better for the community. This article is just the POC that I have done for query side.
Depending on the language you are working in, there may be GraphQL libraries that are stored-procedure aware. If not, you can write your own. Edit: If you're using ASP. NET Core, check out this library and follow the examples, except replace the hard-coded data with calls in the library you would usually use to communicate with SQL Server to fetch the required data.
I recommend Dapper it was actually written by the folks at Stack Overflow!Mhdtvworld app
Query "[dbo]. Learn more. How to migrate existing stored procedures to use graphql Ask Question. Asked 1 year, 9 months ago. Active 1 year, 9 months ago. Viewed 1k times.
Sai Manibalan Sai Manibalan 35 8 8 bronze badges. Active Oldest Votes. Hugo Hugo 4 4 silver badges 11 11 bronze badges. Great, I am using Asp.
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Wrapping a REST API in GraphQL
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