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How to convert select-input content to string on sql query?

My html form has 2 select-input field which are sent via HTTP POST as json to my java webserver API and then to my postgresql. Im having a internal error and i believe that is because the select-input json output is like this "field":["value"]
How can i tell java to read the content inside the [ ]?
this is my query
String sqlQuery = "INSERT INTO neuromotora(nervonome,latencia,amplitudedistal,amplitudeprox,velocidade,ondaf,pacienteid,ladonervo)"
+ " VALUES(?,?,?,?,?,?,?,?) RETURNING neuromotoraid";
This is the http post method on my angular frontend
postData(params){
let headers = new Headers();
headers.append('Content-type','application/json');
return this.http.post(this.api,params,{
headers: headers
}).map(
(res:Response) => {return res.json();}
);
And this is the java web server post method
#POST
#Consumes(MediaType.APPLICATION_JSON)
#Path("/neuromotora/")
public Response createNeuromotora(Neuromotora n) throws SQLException, ClassNotFoundException{
neuromotoraDAO dao = new neuromotoraDAO();
dao.insert(n);
return Response
}
And this is the neuromotora java
public class Neuromotora {
private int neuromotoraid;
private String latencia;
private String amplitudeDistal;
private String amplitutdeProx;
private String nervoNome;
private String ladoNervo;
private String ondaF;
private int pacienteid;
...getters and setters..
}
Insert method
public Long insert(Neuromotora oferta) throws SQLException, ClassNotFoundException{
Long id = null;
String sqlQuery = "INSERT INTO neuromotora(nervonome,latencia,amplitudedistal,amplitudeprox,velocidade,ondaf,pacienteid,ladonervo)"
+ " VALUES(?,?,?,?,?,?,?,?) RETURNING neuromotoraid";
try{
PreparedStatement stmt = this.con.getConnection().prepareStatement(sqlQuery);
stmt.setString(1,oferta.getNervoNome());
stmt.setString(2,oferta.getLatencia());
stmt.setString(3,oferta.getAmplitudeDistal());
stmt.setString(4,oferta.getAmplitutdeProx());
stmt.setString(5, oferta.getVelocidade());
stmt.setString(8, oferta.getOndaF());
stmt.setInt(6,oferta.getPacienteid());
stmt.setString(7,oferta.getLadoNervo());
ResultSet rs = stmt.executeQuery();
if(rs.next()){
id = rs.getLong("neuromotoraid");
}
this.con.commit();
}
catch(SQLException e){
this.con.rollback();
throw e;
}
return id;
}

Removing the the multiple="true" on the ion-select and adding size="1" worked for me, the input is no longer a json array.

JAX-RS: How to navigate to Response method to get all resources?

I want to implement method to get All Orders when I send request on: localhost:8080/ProjectName/MyApplication/orders
Now when I access that location in my web browser I got:
HTTP Status 404 - Not Found
#Path("orders")
public class MehanicarServis {
#GET
#Produces(MediaType.TEXT_XML)
public Response getOrders() {
try {
Connection c = DriverManager.getConnection(DB.LOCATION, DB.USER, DB.PASS);
Statement s = c.createStatement();
String query = "SELECT * FROM orders";
ResultSet r = s.executeQuery(query);
List<Order> orders = new ArrayList<>();
while (r.next()) {
orders.add(new Order(r.getInt("id"), r.getString("name")));
}
GenericEntity<List<Order>> gOrders = new GenericEntity<List<Order>>(orders) {};
return Response.status(200).entity(gOrders).build();
} catch (SQLException ex) {
Logger.getLogger(MehanicarServis.class.getName()).log(Level.SEVERE, null, ex);
return Response.status(404).build();
}
}
Method is right, there's no problems, but I have problem to invoke this Response method over URL in browser? What should i change in URL example to invoke it?
P.S. I've implemented MyApplication class which extends Application, so in my opinion mistake is somewhere between annotations of getOrders()?

Servlet with jdbc response to client [duplicate]

This question already has answers here:
Show JDBC ResultSet in HTML in JSP page using MVC and DAO pattern
(6 answers)
Closed 6 years ago.
I have a database with houses, and HTML page with <SELECT>, where user need to select a district where the houses are located.
Servlet:
#WebServlet("/post")
public class HosesBaseServlet extends HttpServlet {
#Override
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException{
//choice from html form
String choice = request.getParameter("district");
//Database parameters
final String DB_CONNECTION = "jdbc:mysql://localhost:3306/mydb2";
final String DB_USER = "root";
final String DB_PASSWORD = "root";
Connection conn;
try {
conn = DriverManager.getConnection(DB_CONNECTION, DB_USER, DB_PASSWORD);
System.out.println("Connection available");
PreparedStatement ps = conn.prepareStatement("SELECT Square, RoomNumbers, Price FROM houses WHERE District = " + choice);
}catch (SQLException ex) {
System.out.println("Fail to connect with base");
}
}
}
How can I put SQL select results into HTML page and give it back to client?
I created class House
public class Hosue implements Serializable {
private String price;
private String square;
private String RoomNumbers;
public String getPrice() {
return price;
}
public String getSquare() {
return square;}
public String getRoomNumbers() {
return RoomNumbers;}
public void setPrice(String price) {
this.price = price;
}
public void setSquare(String square) {
this.square = square;
}
public void setRoomNumbers(String roomNumbers) {
RoomNumbers = roomNumbers;
}
}
and houses
public class Houses {
public List<House> getList() {
}
}
and add script to my html. What next, how to add information from select to this list?

You can solve your problem as said by Jeed in the previous answer. However, it would be better if you model your db entities with Java objects and use them to encapsulate information from and towards the db. You may also use the DAO programming pattern to better organize your code, thus you can define simple objects (beans) to model data (your database entities) and data access object (DAO object) in which you would encode interaction with the db (your jdbc code).
Then you will have something like this to query your db (this code will be in your servlet):
HouseDAO h=new HouseDAO(db connection param...)
ArrayList<House> list=h.selectHouses();
In the HouseDAO object you will create a method selectHouse in which you will basically move the jdbc code you have in your servlet right now. By the way, your are missing a part in which you call the method execute query from the ps object. This method returns a ResultSet object which contains the query result.
With the code above, you will have your data in the ArrayList list, and you can use the code suggested by Jeed to output it.
Clearly, if you want to avoid using jsp, you can print your html code directly in your servlet. I do not recommend this as you would merge view details with control and model code. This is not good especially if you are planning to change your view in the future.

Add result of your query to some List or custom object and set it as attribute in your request object.
request.setAttribute("result", result);
and then forward to your next page using RequestDispatcher.

Use Gson external Library for sending java-List into String form to
HTML,
Your Servlet Code looks likewise,
List<House> listofHouses = getList from Database;
Gson gson = new Gson();
String json_obj = gson.toJson(listofHouses);
response.getWriter().println(json_obj);
Your HTML(use Jquery-ajax for Handling result & send Request to
Servlet ) Code looks some what nearer likewise......
<script>
$.ajax({
url: 'Servlet.do?distinct=YOUR_SELECTED_district_NAME',
type: "POST/GET",
data: query,
dataType: 'application/json; charset=utf-8',
success: function (data) {
var returnedData = JSON.parse(data);
alert(data);
$.each(data, function(index, value) {
('#your_drop_down_tag_id').append($('<option>').text(value).attr('value', index));
});
}
});
</script>
NOTE: jquery-XXX.js file must be inclue into your project and into your html file properly.

Removing/deleting from google datastore using endpoints, illegal arguement exception, delete with non-zero content length not supported

I'm trying to delete objects from the datastore (using cloud endpoints)
I know the connection is valid because I'm pulling/inserting objects with no problem
However when I try to delete using various approaches I get the same exception
java.lang.illegalArgumentException:DELETE with non-zero content length is not supported
approach 1(using the raw datastore service and the key I stored when inserting the item):
#ApiMethod(name = "removeRPurchase")
public RPurchase removeRPurchase(RPurchase purchase) {
NamespaceManager.set(purchase.getAccount());
DatastoreService d=DatastoreServiceFactory.getDatastoreService();
Key k=KeyFactory.stringToKey(purchase.getKeyrep());
try {
d.delete(k);
} catch (Exception e) {
e.printStackTrace();
purchase=null;
}
return purchase;
}
Approach 2
#ApiMethod(name = "removeRPurchase")
public RPurchase removeRPurchase(RPurchase purchase) {
NamespaceManager.set(purchase.getAccount());
Key k=KeyFactory.stringToKey(purchase.getKeyrep());
EntityManager mgr = getEntityManager();
RPurchase removed=null;
try {
RPurchase rpurchase = mgr.find(RPurchase.class, k);
mgr.remove(rpurchase);
removed=rpurchase;
} finally {
mgr.close();
}
return removed;
}
Ive also tried various variations with the entity manager and the Id, but all with the same exception
The object that i've passed in does contain the namespace in the account, and it does contain the 'KeytoString' of the key associated with the object
the endpoint is called as it should in an AsyncTask endpoint.removeRPurchase(p).execute();
Any help suggestions are appreciated

Make your API method a POST method like this:
#ApiMethod(name = "removeRPurchase" path = "remove_r_purchase", httpMethod = ApiMethod.HttpMethod.POST)
public RPurchase removeRPurchase(RPurchase purchase) {
NamespaceManager.set(purchase.getAccount());
DatastoreService d=DatastoreServiceFactory.getDatastoreService();
Key k=KeyFactory.stringToKey(purchase.getKeyrep());
try {
d.delete(k);
} catch (Exception e) {
e.printStackTrace();
purchase=null;
}
return purchase;
}
I had the same problem because I was using httpMethod = ApiMethod.HttpMethod.DELETE. The error it gives is correct. Simply change it to a POST and do whatever you want inside that API method like delete entities, return entities, etc.

How about trying out the following :
#ApiMethod(
name = "removeRPurchase",
httpMethod = HttpMethod.DELETE
)
public void removeRPurchase(#Named("id") String id) {
//Now take the id and plugin in your datastore code to retrieve / delete
}

c3p0 and Oracle object type problem

had several apps with jdbc and Oracle 10g. Now I´m changing the apps for use c3p0. But I have some problems working with Oracle types.
I Have this Oracle type:
CREATE OR REPLACE
TYPE DATAOBJ AS OBJECT
(
ID NUMBER,
NAME VARCHAR2(50)
)
And this Oracle function:
CREATE OR REPLACE FUNCTION F_IS_DATA_OBJECT (datar in DATAOBJ) RETURN varchar2 IS
tmpVar varchar2(150);
BEGIN
tmpVar := 'Data object:';
if datar.id is not null then
tmpVar := tmpVar || 'id=' || datar.ID;
end if;
if datar.name is not null then
tmpVar := tmpVar || 'name=' || datar.name;
end if;
return tmpVar;
EXCEPTION
WHEN NO_DATA_FOUND THEN
NULL;
WHEN OTHERS THEN
RAISE;
END F_IS_DATA_OBJECT;
then I have a app in Java with c3p0 with next classes:
Dataobj.class to represent the object type:
package c3p0pruebas.modelo;
import java.io.Serializable;
import java.sql.SQLData;
import java.sql.SQLException;
import java.sql.SQLInput;
import java.sql.SQLOutput;
public class Dataobj implements SQLData, Serializable {
private String name;
private Integer id;
public Dataobj() {
}
public String getSQLTypeName() {
return "DATAOBJ";
}
public void writeSQL(SQLOutput stream) throws SQLException {
stream.writeInt(id.intValue());
stream.writeString(name);
}
public void readSQL(SQLInput stream, String typeName) throws SQLException {
id = new Integer(stream.readInt());
name = stream.readString();
}
public void setName(String name) {
this.name = name;
}
public String getName() {
return name;
}
... and its gets and sets ....
And the main class and main method:
Connection connection = DBConnectionManager.getInstance().getConnection("Mypool"); //I use a class to get connection
CallableStatement cs = null;
String error = "";
try {
/*
//First I made a NativeExtractor of the connection, but the result is the same, I got it from Spring framework.
//C3P0NativeJdbcExtractor extractor = new C3P0NativeJdbcExtractor();
//OracleConnection newConnection = (OracleConnection) extractor.getNativeConnection(connection);
//cs = (OracleCallableStatement) newConnection.prepareCall("{? = call F_IS_DATA_OBJECT(?)}");
*/
//Creates the object
Dataobj obj = new Dataobj();
obj.setId(new Integer(33));
obj.setName("myName");
cs = connection.prepareCall("{? = call F_IS_DATA_OBJECT(?)}");
cs.registerOutParameter(1, OracleTypes.VARCHAR);
cs.setObject(2, obj);
cs.execute();
error = cs.getString(1);
System.out.println("Result: " + error);
} catch (SQLException e) {
e.printStackTrace();
} catch (Exception ex) {
ex.printStackTrace();
} finally {
closeDBObjects(null,cs,null);
}
closeDBObjects(null, null, connection); //Close connection
The execution gets:
Data object: id=33.
I cant get the String (Varchar2) value, the name string.
With oracle arrays of object type, I have the same problem, It worked nice with JDBC. When I worked with Arrays, also, it hasn´t the string values:
//Here I use a NativeConnection ...
Dataobj arrayOfData[] = new Dataobj[myDataObj.size()];
... //Makes the array of DataObj.
ArrayDescriptor descriptor = ArrayDescriptor.createDescriptor("OBJ_ARRAY", newConnection);
ARRAY arrayDatas = new ARRAY(descriptor, newConnection, arrayOfData);
//In this step, objects of arrayDatas haven´t the name string...
Thanks!!!

OK, It finally works.
Searching, We found out the answer:
We change data definition in the database and now it works:
CREATE OR REPLACE
TYPE "DATAOBJ" AS OBJECT
(
vid NUMBER,
vname NCHAR(50)
)
Thanks!

I had the same problem and i solved without change VARCHAR2 to NCHAR, because for me, the NCHAR doesn't appear the String in the Oracle, stay "?" in all the positions.
I changed the oracle driver of the WAR to the version of my database, in my case was 11.2.0.1.0:
http://www.oracle.com/technetwork/database/enterprise-edition/jdbc-112010-090769.html
And i put another driver, that is the NLS for Oracle Objects and Collections:
http://download.oracle.com/otn/utilities_drivers/jdbc/112/orai18n.jar
With this, i solved the problem and the VARCHAR2 worked fine.
Good luck.