add database support

database.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+  "database/sql"
+  _ "github.com/lib/pq"
+)
+
+type (
+  Post  struct {
+    Title string
+  }
+
+  DBPosts []Post
+)
+
+var DB *sql.DB
+
+func db_open(url string) error {
+  var err error
+  DB, err = sql.Open("postgres", url)
+  if err != nil {
+    return err
+  }
+  if _, err := DB.Exec("select 1"); err != nil {
+    return err
+  }
+  return nil
+}
+
+func GetPosts() DBPosts {
+  rows, err := DB.Query("select title from posts order by written desc")
+  if err != nil { return make(DBPosts, 0) }
+
+  result := make(DBPosts, 0)
+  for rows.Next() {
+    post := Post{}
+    rows.Scan(&post.Title)
+    result = append(result, post)
+  }
+  return result
+}
+

main.go

@@ -48,6 +48,11 @@ func main() {
     log.Printf("Error when loading the templates: %v", err)
     os.Exit(1)
   }
+  if err := db_open(config.Connection); err != nil {
+    log.Printf("Error when opening database connection: %v", err)
+    os.Exit(1)
+  }
+  defer DB.Close()
 
   router := httprouter.New()
   define_routes(router)

routes.go

@@ -7,17 +7,17 @@ import (
 
 // map URLs to their functions
 func define_routes(router *httprouter.Router) {
-  router.HandlerFunc("GET", "/", Index)
+  router.HandlerFunc("GET", "/", RouteIndex)
 
-  router.GET("/post", Posts)
+  router.GET("/post", RoutePosts)
 }
 
 // the function for route /
-func Index(w http.ResponseWriter, r *http.Request) {
+func RouteIndex(w http.ResponseWriter, r *http.Request) {
   Templates.ExecuteTemplate(w, "welcome", nil)
 }
 
-func Posts(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
-  posts := []int {0, 1, 2, 3, 4}
+func RoutePosts(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
+  posts := GetPosts()
   Templates.ExecuteTemplate(w, "posts/index", posts)
 }

templates/posts/index.tmpl

@@ -1,7 +1,7 @@
 {{ template "header" . }}
   <ul>
     {{ range . }}
-      <li>{{ . }}
+      <li>{{ .Title }}
     {{ end }}
   </ul>
 {{ template "footer" . }}