CRUD JDBC template problem with delete operation - spring-mvc

Question

I have problem with CRUD delete operation. When i click Delete which is written in this way in jsp file <form action="delete?Id=${medicines.id}" method="post">
<input type="submit" value="Delete">
</form>.
Here is my DeleteController(if I type something in doGet, then I get results from it, not blank page)
#WebServlet("/delete")
public class MedicinesDeleteController extends HttpServlet {
private static final long serialVersionUID = 1L;
#Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
#Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
int id = Integer.parseInt(request.getParameter("Id"));
if(request.getUserPrincipal() != null) {
MedicinesService query = new MedicinesService();
query.delete(id);
response.sendRedirect(request.getContextPath() + "/");
} else {
response.sendError(403);
}
}
}
Delete function from MedicinesService(i think this is my problem)
public void delete(int id) {
DAOFactory factory = DAOFactory.getDAOFactory();
MedicinesDAO medicinesDao = factory.getMedicinesDAO();
Medicines medicines = new Medicines();
medicines.setId(id);
medicinesDao.delete(medicines);
}
And MedicinesDAOImpl
private final static String DELETE_MEDICINES =
"DELETE FROM medicines WHERE id_medicines=:id_medicines;";
#Override
public void delete(Medicines medicines) {
SqlParameterSource namedParameter = new MapSqlParameterSource("Id", medicines.getId());
template.update(DELETE_MEDICINES, namedParameter);
}
New errors
medicinesDao.delete(medicines); < MedicicinesService:41
template.update(DELETE_MEDICINES, namedParameter); < MedicinesDAOImpl:77
query.delete(id); <MedicinesDeleteController:31
Type Exception Report
Message No value supplied for the SQL parameter 'id_medicines': No value registered for key 'id_medicines'
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
org.springframework.dao.InvalidDataAccessApiUsageException: No value supplied for the SQL parameter 'id_medicines': No value registered for key 'id_medicines'
org.springframework.jdbc.core.namedparam.NamedParameterUtils.buildValueArray(NamedParameterUtils.java:355)
org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.getPreparedStatementCreator(NamedParameterJdbcTemplate.java:398)
org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.getPreparedStatementCreator(NamedParameterJdbcTemplate.java:370)
org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.update(NamedParameterJdbcTemplate.java:317)
pl.firstaidkit.dao.MedicinesDAOImpl.delete(MedicinesDAOImpl.java:77)
pl.firstaidkit.dao.MedicinesDAOImpl.delete(MedicinesDAOImpl.java:1)
pl.firstaidkit.service.MedicinesService.delete(MedicinesService.java:41)
pl.firstaidkit.controller.MedicinesDeleteController.doPost(MedicinesDeleteController.java:31)
javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
pl.firstaidkit.filter.LoginFilter.doFilter(LoginFilter.java:26)
Note The full stack trace of the root cause is available in the server logs.

Answer 1

Original issue was that , this would result in an http get method call and doGet() method had no code to handle the same
Delete
Second issue was with the mismatch in MapSqlParameterSource param name and place holder in query.