How to use an implicit class in another function?

In many applications, you might need to pass around a database connection to various methods that interact with the database. Instead of passing this connection explicitly every time, you can declare it as an implicit value and let Scala's compiler do the work for you. Here's an example:

import java.sql.Connection

// Define a method that needs a database connection
def queryDatabase(query: String)(implicit conn: Connection): ResultSet = {
  val statement = conn.createStatement()
  statement.executeQuery(query)
}

// Elsewhere in your code, declare an implicit database connection
implicit val dbConnection: Connection = DriverManager.getConnection("jdbc:mysql://localhost/test?user=testuser&password=testpassword")

// Now you can call `queryDatabase` without explicitly passing the connection
val resultSet = queryDatabase("SELECT * FROM users")

In this example, queryDatabase requires a Connection as an implicit parameter. When you call queryDatabase, you don't need to pass the dbConnection explicitly. The Scala compiler will look for an implicit Connection in the current scope and use it. In this case, it finds the dbConnection you defined.