How to Pass Arguments (e.g., Database Connection) to Gin Router Handlers in Go?

Passing Arguments to Gin Router Handlers in Golang

In Gin, a popular web framework for Golang, you can easily set up RESTful APIs. However, passing arguments to router handlers raises questions for developers.

Question: How do you pass an argument to a Gin router handler, such as a database connection?

Answer: While using a global variable for dependencies is acceptable for smaller projects, there are two more practical options:

1. Passing via Closure: Create a function that returns a gin.HandlerFunc, passing the database connection as an argument within the closure. This satisfies Gin's requirements and ensures the handler has access to the database connection.
2. Passing via Middleware: Define a middleware function that wraps the handler. In the middleware, access the database connection and set it in the request context, making it available to the handler. Middleware allows for common tasks to be executed before or after the handler function.

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