Phriction Knowledge Center - Hexavara Technology Crema Framework Handler

Handler
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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 1,648 Days AgoPublicActions

Event Timeline

Handler
Updated 1,648 Days AgoPublic
Actions