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Table of contents
1.
Introduction
2.
What is GraphSQL
2.1.
GraphSQL Architecture
3.
Why is GraphSQL used?
4.
Using GraphSQL with Gin
5.
Frequently Asked Questions
5.1.
What is Gin in Golang?
5.2.
Is Gin a good framework?
5.3.
What is GraphSQL?
6.
Conclusion
Last Updated: Mar 27, 2024

GraphSQL with Gin

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Introduction

Let's ensure we understand the foundational concepts before delving further into the subjects. Here is a brief introduction if you are unfamiliar with Gin.

GraphSQL with Gin

Gin is a Golang-based, high-performance HTTP web framework (Go). Gin claims to be up to 40 times faster and has an API similar to martinis. Gin makes it possible to create Go-based web applications and microservices. It has some frequently used capabilities (e.g., routing, middleware support, rendering, etc.)       

This article explains the details of GraphSQL with Gin, in which we will talk about GraphSQL, Why GraphSQL is used, and Using GraphSQL with Gin.
 

Without further ado, let's get started.

What is GraphSQL

GraphSQL

GraphQL is a query language for your API that allows you to request specific data from a server rather than getting a fixed set of data from an endpoint. This makes it flexible and allows the client to get exactly what it needs rather than being limited to the data that the server decides to provide.

GraphSQL Architecture

Graph SQL Architecture

☑️ Schema: Schema is a way to give an object or resource structure. We can query or modify the data/resource on the GraphqL server based on the schema.

☑️ Queries: The data is retrieved from the GraphQL server using queries.

☑️ Mutations: The resource on the server is updated/modified using mutations.

☑️ Resolvers: Resolvers are used to generate a data structure that matches the resource schema provided.

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Why is GraphSQL used?

💁 Here are reasons why GraphQL is used:

 

✔️ API evolution: One of the main benefits of GraphQL is that it allows for API evolution without breaking client applications. With GraphQL, you can add new fields and types to your API without affecting existing clients as long as you maintain backward compatibility for any deprecated fields or types. This is because the client specifies the data it needs in the GraphQL query, so the server can continue to provide the same data even if the underlying implementation changes.

✔️ Real-time information: GraphQL easily retrieves real-time data from your API. For example, you can use GraphQL subscriptions to get notified when certain data changes, and you can use GraphQL mutations to update data on the server. This makes it easy to build real-time applications requiring frequent server updates.

✔️ Strong typing: GraphQL has a strong type system, which helps to ensure that the data you receive from the server is accurate and consistent. With GraphQL, you can define the types and fields available in your API, and the server will validate that the data returned matches the expected types. This can help to prevent errors and make your API more reliable.

✔️ Strong community: GraphQL has a strong community of developers and users, which means that there is a lot of support and resources available for learning and using GraphQL. Many libraries and tools are also available for working with GraphQL, which can make it easier to build and maintain GraphQL APIs.

Using GraphSQL with Gin

📁 One way to use Gin with GraphQL is to set up a GraphQL server using a library like graphql-go and then use Gin as the HTTP server to handle requests to the GraphQL API.

You will first need to set up your GraphQL schema and resolvers to do this. The schema defines the types and fields available in your API, and the resolvers are functions that resolve the data for those fields.

Once you have your GraphQL server set up, you can use Gin to handle requests to your GraphQL API. To do this, you will need to create a Gin route for your GraphQL endpoint and then use the graphql-go library to execute the GraphQL query and return the result to the client.

💁 Here is an example of how you might set up a GraphQL endpoint using Gin:

import (
"github.com/gin-gonic/gin"
"github.com/graphql-go/graphql"
)
func main() {
 // Set up your GraphQL schema and resolvers
 schema, err := graphql.NewSchema(...)
 if err != nil {
 // Handle error
  }
 // Set up Gin router
 router := gin.Default()
 // Add GraphQL route
 router.POST("/graphql", func(c *gin.Context) {
 // Execute GraphQL query and return result
 result := graphql.Do(graphql.Params{
 Schema: schema,
 RequestString: c.PostForm("query"),
 })
 c.JSON(200, result)
 })
 // Start server
 router.Run(":3000")
}

 

💁 Here are a few more details about using GraphQL with Gin: 

☑️ GraphQL schema and resolvers: As mentioned earlier, the GraphQL schema defines the types and fields available in your API. The resolvers are functions that resolve the data for those fields. The schema is typically written in the GraphQL Schema Definition Language (SDL), a human-readable syntax for defining GraphQL types and fields. The resolvers are usually written in the programming language of your choice (in this case, Go). 

☑️ Executing a GraphQL query: To execute a GraphQL query, you can use the graphql. Do function from the graphql-go library. This function takes a graphql. Params struct as an argument contains the schema, the GraphQL query, and any variables used in the query. The function returns a graphql. The result struct contains the data returned by the query, as well as any errors that may have occurred during execution. 

☑️ Handling GraphQL variables: In GraphQL, you can use variables in your query to pass dynamic values from the client to the server. For example, you might use a variable to pass the ID of a specific item you want to retrieve. To handle variables in your GraphQL endpoint, you can use the variables field in the graphql.Params struct. This field should contain a map of variable names to their corresponding values.

Frequently Asked Questions

What is Gin in Golang?

Gin is a Golang-based, high-performance HTTP web framework (Go). Gin claims to be up to 40 times faster and has an API similar to martinis. Gin makes it possible to create Go-based web applications and microservices. 

Is Gin a good framework?

Gin is a quick framework with little memory usage. This is mostly due to adopting the lightweight, high-performance HTTP request router HttpRouter. A radix tree is used by Gin and HttpRouter to quickly parse lengthy and intricate route requests.

What is GraphSQL?

GraphQL is a query language for your API that allows you to request specific data from a server rather than getting a fixed set of data from an endpoint. 

Conclusion

Congratulations on finishing the blog! We have discussed the details of GraphSQL with Gin, in which we talk about GraphSQL, Why GraphSQL is used, and Use GraphSQL with Gin.

We hope this blog has helped you enhance your knowledge of GraphSQL with Gin. If you'd like to learn more, Check out the following links:

🔥 Introduction to Go

🔥 Variables and Constants in Go

🔥 Datatypes and operators

 

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