How can I retrieve selected checkboxes by user into a JPA application?

Question

Hello, I'm developing an app in JPA, still learning this, I'm displaying some checkboxes which I save into a List, then I separate the selections and put them into an Array, which I convert into String and that's what I store into MySQL table, this is what I have on the index.xhtml file:
<h:selectManyCheckbox value="#{employee.selectedItems}">
<f:selectItems var="checkList" value="#{employee.checkboxList()}" itemValue="#{checkList.idTechnology}" itemLabel="#{checkList.name}"></f:selectItems>
</h:selectManyCheckbox>
The method checkboxList is in charge of generating the checkboxes and assign a value and name, and the method "selectedItems" is the List<String> that stores the selected checkboxes values, so what I save into the table is something like this: "1,4,6,7" but I don't know how to retrieve the selections and check the checxkboxes according the what the user have on the table:
This is the method that I use to select all the records from the selected user, this fills all the textfields so I can edit the user, but not the checkboxes, and that's what I need to do:
public void seleccionarEmpleado(int id_empleado){
Query q = em.createNamedQuery("Employee.findByIdEmployee");
q.setParameter("IdEmployee", IdEmployee);
List<Empleado> listaEmple = q.getResultList();
for(IdEmployee emple1 : listaEmple){
emp.setIdEmployee(emple1 .getIdEmployeeo());
emp.setName(emple1 .getName());
emp.setLname(emple1 .getLname());
emp.setTel(emple1 .getTel());
emp.setAddress(emple1 .getDir());
emp.setTech(emple1 .getTecha());
Variable Tech is the one who gets the numbers like "2,3,4" etc, but how can I make the checkboxes to be checked according to these numbers? my english is not so good, thanks in advanced, have a nice day!

Answer 1

Hello, I'm developing an app in JPA, still learning this, I'm displaying some checkboxes which I save into a List, then I separate the selections and put them into an Array, which I convert into String and that's what I store into MySQL table, this is what I have on the index.xhtml file:
<h:selectManyCheckbox value="#{employee.selectedItems}">
<f:selectItems var="checkList" value="#{employee.checkboxList()}" itemValue="#{checkList.idTechnology}" itemLabel="#{checkList.name}"></f:selectItems>
</h:selectManyCheckbox>
The method checkboxList is in charge of generating the checkboxes and assign a value and name, and the method "selectedItems" is the List<String> that stores the selected checkboxes values, so what I save into the table is something like this: "1,4,6,7" but I don't know how to retrieve the selections and check the checxkboxes according the what the user have on the table:
This is the method that I use to select all the records from the selected user, this fills all the textfields so I can edit the user, but not the checkboxes, and that's what I need to do:
public void seleccionarEmpleado(int id_empleado){
Query q = em.createNamedQuery("Employee.findByIdEmployee");
q.setParameter("IdEmployee", IdEmployee);
List<Empleado> listaEmple = q.getResultList();
for(IdEmployee emple1 : listaEmple){
emp.setIdEmployee(emple1 .getIdEmployeeo());
emp.setName(emple1 .getName());
emp.setLname(emple1 .getLname());
emp.setTel(emple1 .getTel());
emp.setAddress(emple1 .getDir());
emp.setTech(emple1 .getTecha());
Variable Tech is the one who gets the numbers like "2,3,4" etc, but how can I make the checkboxes to be checked according to these numbers? my english is not so good, thanks in advanced, have a nice day!