Insert values in mySQL using wcf REST and Android

问题:

I wrote a REST web service in C#. Get request works fine, but insert, update and delete not. When I try to insert some values from an Android tablet (client) via the REST service into a mySQL database an error occurs: Method not allowed

I send a JSON string from the android client to the web service:

in Android Developer Tool (eclipse):

String url = IP + PORT +"/RESTService/insert/";
            HttpClient client = new DefaultHttpClient();
            HttpResponse response;
            JSONObject json = new JSONObject();

                HttpPost post = new HttpPost(url);
                json.put("userName", name);
                json.put("userPassword", password);

                StringEntity se = new StringEntity(json.toString());
                se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE,"application/json"));
                post.setEntity(se);
                response = client.execute(post);

in C#: Service interface:

[OperationContract]
    [WebInvoke(Method = "POST", UriTemplate = "/insert/{jsonObj}", 
        RequestFormat = WebMessageFormat.Json,       
        ResponseFormat = WebMessageFormat.Json,
        BodyStyle = WebMessageBodyStyle.Bare)]
    void InsertUser(string jsonObj);

Service methode:

 public void InsertUser(string jsonObj)
    {
        string name = null;
        string password = null;
        DataContractJsonSerializer obj = new DataContractJsonSerializer(typeof(User));
        dynamic dynObj = JsonConvert.DeserializeObject(jsonObj);

        foreach (var data in dynObj.userObject)
        {
            name = data.userName;
            password = data.userPassword;
        }

       string sql = "INSERT INTO user (userName, userPassword) VALUES('" + name + "', '" + password +"';)";

       if (conn.State == ConnectionState.Closed)
       {
           conn.Open();
       }

       command = new MySqlCommand(sql, conn);
       command.ExecuteNonQuery();
       conn.Close();
       command.Dispose();
    }

My User:

    namespace RESTService
{
    [DataContract]
    public class User
    {
        [DataMember]
        public string userName { get; set; }
        [DataMember]
        public string userPassword { get; set; }

        public User(string name, string password)
        {
            this.userName = name;
            this.userPassword = password;
        }
    }

When I start the web service and try to insert the values via android app, nothing happens. I think, that the values from the app don't reach the web service. But I have no idea why. It would be great, if somebody can help me :).

Thanks in advance

回答1:

The first step would be to write a C# unit test that exercises the InsertUser method through the web service. When running this test I think you'd discover that your UriTemplate is incorrect. If you're making a POST, the json object will be in the body of the request, not in the url. I'd try an attribute like this:

[WebInvoke(Method = "POST", UriTemplate = "/users", 
    RequestFormat = WebMessageFormat.Json,       
    ResponseFormat = WebMessageFormat.Json]

Your android url would look like this (I think):

String url = IP + PORT + "/users";

Another thing to check out would be Fiddler. When your unit test passes, you can inspect successful requests. Your android client can also be configured to use Fiddler.