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    <p>Two simple method:</p> <p><strong>1.global database session</strong></p> <pre><code>package main import ( "net/http" "log" "fmt" "./backend" ) var mongoConn * backend.MongoDBConn func AddHandler(w http.ResponseWriter, r *http.Request) { log.Printf("serving %v %v", r.Method, r.URL.Path[1:]) if r.Method != "POST" { fmt.Fprintln(w, "Not POST Method ") return } title := r.FormValue("title") description := r.FormValue("description") fmt.Fprintf(w, " title description %v %v", title, description) //I can't call mongoConn.AddToDo(title, description) from here mongoConn.AddToDo(title, description) } const AddForm = ` &lt;html&gt;&lt;body&gt; &lt;form method="POST" action="/add"&gt; Name: &lt;input type="text" name="title"&gt; Age: &lt;input type="text" name="description"&gt; &lt;input type="submit" value="Add"&gt; &lt;/form&gt; &lt;/body&gt;&lt;/html&gt; ` func Index(w http.ResponseWriter, r *http.Request) { fmt.Fprintln(w, AddForm) } func main() { //connect to mongoDB mongoConn = backend.NewMongoDBConn() _ = mongoConn.Connect("localhost") defer mongoConn.Stop() http.HandleFunc("/", Index) http.HandleFunc("/add", AddHandler) log.Println("Start Server:") err := http.ListenAndServe(":8080", nil) if err != nil { log.Fatal("ListenAndServe:", err) } } </code></pre> <p><strong>2.a new db connection on every request</strong></p> <pre><code>import ( "./backend" //other boilerplate imports ) func AddHandler(writer http.ResponseWriter, request *http.Request) { log.Printf("serving %v %v", request.Method, request.URL.Path[1:]) if request.Method != "POST" { serve404(writer) return } title := request.FormValue("title") description := request.FormValue("description") fmt.Fprintf(writer, " title description %v %v", title, description) //................ mongoConn := backend.NewMongoDBConn() _ = mongoConn.Connect("localhost") mongoConn.AddToDo(title, description) //.................... mongoConn.Stop() } ...... </code></pre> <p><strong>a better solution:</strong></p> <blockquote> <p>You could create a pool of db sessions, then before processing the request you pick one and put in the context of that request. Then after the request is done you push the connection back to the pool.</p> <p>If the pool is empty you create a new connection If the pool is full you close the connection</p> </blockquote> <p>For more information, click <a href="https://groups.google.com/forum/?fromgroups=#!topic/golang-nuts/gjvK4zcYy6U" rel="nofollow">here</a>.</p>
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    1. POHow do I call mongoDB CRUD method from handler?
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    1. POHow do I call mongoDB CRUD method from handler?
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    1. COThe first solution of a global variable, I had tried it earlier and it doesn't work. I keep getting this error: http: panic serving [::1]:55642: runtime error: invalid memory address or nil pointer dereference
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    2. COdefine a global variable:`var mongoConn *benkend.MongoDBConn`, connect mongodb in main function:`mongoConn = backend.NewMongoDBConn()`.I hava change the code above, it works.
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