Phriction Knowledge Center - Hexavara Technology Crema Framework Handler

Handler
Updated 1,864 Days AgoPublic
Actions

Introduction

Crema uses standard function handler of the type http.HandlerFunc which takes an http.ResponseWriter and an http.Request as its arguments.

For example from this endpoints, we can define a handler

func hello(w http.ResponseWriter, r *http.Request) {

	w.Write([]byte("Hello World!"))
}

Using Generic Handler

Crema provides us with a generic handlers to create a basic application of CRUD faster. As an example, we'll begin by creating the CRUD endpoints for a resource named users:

server.AddRoutes(http.MethodGet, "/users", crema.MakeGenericGetHandler(GetUser))
server.AddRoutes(http.MethodPost, "/users", crema.MakeGenericPostHandler(PostUser))
server.AddRoutes(http.MethodPut, "/users/{id}", crema.MakeGenericPutHandler(PutUser))
server.AddRoutes(http.MethodDelete, "/users/{id}", crema.MakeGenericDeleteHandler(DeleteUser))

Then we set up the handler corresponding each endpoint.

GET users

func GetUser(conditions map[string]string) (*sql.Rows, error) {
	q := crema.GetGenericSelectQuery("users", conditions, "id")

	return crema.ExecuteQuery(q.QueryString)
}

POST users

func PostUser(tx *sql.Tx, values map[string]string) *sql.Row {
	q := crema.GetGenericInsertQuery("users", values)

	return crema.ExecuteQueryRow(tx, q.QueryString)
}

UPDATE users

func PutUser(tx *sql.Tx, values map[string]string) (sql.Result, error) {
	q := crema.GetGenericUpdateQuery("users", values, "id")
	
	return crema.ExecuteNonQuery(q.QueryString)
}

DELETE users

func DeleteUser(tx *sql.Tx, conditions map[string]string) (sql.Result, error) {
	q := crema.GetGenericDeleteQuery("users", conditions, "id")

	return crema.ExecuteNonQuery(q.QueryString)
}

Explanation

UPDATED SOON

Event Timeline

• galang created this object.Oct 15 2019, 2:49 PM

• galang edited the content of this document. (Show Details)Oct 15 2019, 3:45 PM

HandlerUpdated 1,864 Days AgoPublicActions

Event Timeline

Handler
Updated 1,864 Days AgoPublic
Actions