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| . | |
| ├── books | |
| │ ├── handlers.go | |
| │ └── models.go | |
| ├── config | |
| │ └── db.go | |
| └── main.go |
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| package config | |
| import ( | |
| "database/sql" | |
| _ "github.com/lib/pq" | |
| ) | |
| type Env struct { | |
| DB *sql.DB | |
| } | |
| func NewDB(dataSourceName string) (*sql.DB, error) { | |
| db, err := sql.Open("postgres", dataSourceName) | |
| if err != nil { | |
| return nil, err | |
| } | |
| if err = db.Ping(); err != nil { | |
| return nil, err | |
| } | |
| return db, nil | |
| } |
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| package books | |
| import ( | |
| "bookstore/config" | |
| "fmt" | |
| "net/http" | |
| ) | |
| func BooksIndex(env *config.Env) http.Handler { | |
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | |
| if r.Method != "GET" { | |
| http.Error(w, http.StatusText(405), 405) | |
| return | |
| } | |
| bks, err := AllBooks(env.DB) | |
| if err != nil { | |
| http.Error(w, http.StatusText(500), 500) | |
| return | |
| } | |
| for _, bk := range bks { | |
| fmt.Fprintf(w, "%s, %s, %s, £%.2f\n", bk.Isbn, bk.Title, bk.Author, bk.Price) | |
| } | |
| }) | |
| } |
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| package main | |
| import ( | |
| "bookstore/books" | |
| "bookstore/config" | |
| "log" | |
| "net/http" | |
| ) | |
| func main() { | |
| db, err := config.NewDB("postgres://user:pass@localhost/bookstore") | |
| if err != nil { | |
| log.Panic(err) | |
| } | |
| defer db.Close() | |
| env := &config.Env{DB: db} | |
| http.Handle("/books", books.BooksIndex(env)) | |
| http.ListenAndServe(":3000", nil) | |
| } |
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| package books | |
| import ( | |
| "database/sql" | |
| ) | |
| type Book struct { | |
| Isbn string | |
| Title string | |
| Author string | |
| Price float32 | |
| } | |
| func AllBooks(db *sql.DB) ([]*Book, error) { | |
| rows, err := db.Query("SELECT * FROM books") | |
| if err != nil { | |
| return nil, err | |
| } | |
| defer rows.Close() | |
| bks := make([]*Book, 0) | |
| for rows.Next() { | |
| bk := new(Book) | |
| err := rows.Scan(&bk.Isbn, &bk.Title, &bk.Author, &bk.Price) | |
| if err != nil { | |
| return nil, err | |
| } | |
| bks = append(bks, bk) | |
| } | |
| if err = rows.Err(); err != nil { | |
| return nil, err | |
| } | |
| return bks, nil | |
| } |
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