Removing row from datatable

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im a beginner with jsf2, primefaces and EJB and im making a back-end application , i succefully listed the database record on a datatable , and i made a command button in the front of each record on the datatable , so i can delete a row when i click on that button , but i made all the code but when i click on the button nothing happend here is the code . and thank youu.

the method in the EJB:

@Override
    public void DeleteCitizen(Citizen citizen) {

        Citizen detachCit =  entityManager.merge(citizen);

        entityManager.remove(detachCit);

        //entityManager.remove(entityManager.merge(citizen));

    }

the backing bean :

 @ManagedBean
    @SessionScoped
    public class CitizenCtr {

        private List<Citizen> citizens = new ArrayList<Citizen>();
        private DataModel<Citizen> datamodel = new ListDataModel<Citizen>();









        //the Model
        Citizen cit = new Citizen();

        //injection of the proxy
        @EJB
        CitizenServicesLocal citizenServiceLocal;





        public List<Citizen> getCitizenss() {
            citizens = citizenServiceLocal.ListAllCitizen();
            return citizens ;
        }

        public DataModel<Citizen> getDatamodel() {
            datamodel.setWrappedData(citizenServiceLocal.ListAllCitizen());
            return datamodel;
        }

        public void setDatamodel(DataModel<Citizen> datamodel) {
            this.datamodel = datamodel;
        }

        public Citizen getCit() {
            return cit;
        }



        public void setCit(Citizen cit) {
            this.cit = cit;
        }



        // Login operation
        public String TryLogin()
        {

            String goTo = null;

            Citizen citizenFound =   citizenServiceLocal.Login(cit.getEmail(),cit.getPassword());

            if(citizenFound!=null)
            {
                cit=citizenFound;
                 goTo="/CitizenProfile/Profile?send-redirect=true";
                System.out.println("Welcome you are logged In ");
            }
            else
            {

                System.out.println("please enter valid data ! ");
                goTo="/welcome?send-redirect=true";
            }

            return goTo;    
        }


        //Subscribe operation
        public String DoSubscribe(){


            String Goto=null;
             citizenServiceLocal.Subscribe(cit);
             Goto ="/welcome?sendredirect=true"; 
            return Goto;

        }



        //Update profile operation
        public String DoUpdateProfile()
        {
            String Goto=null;
            citizenServiceLocal.updateProfile(cit);
             Goto ="/CitizenProfile/Profile?sendredirect=true"; 
                return Goto;

        }


        //Logout operation

        public String DoLogout()
        {
            String  Goto="/welcome?sendredirect=true";
            FacesContext.getCurrentInstance().getExternalContext().invalidateSession();



            return Goto;
        }

        public Citizen GetAllCitizen()
        {
            List<Citizen> list ;
        list=   citizenServiceLocal.ListAllCitizen();

            return (Citizen) list;
        }


        // Ban Operation
        public void BanCitizen()
        {

            citizenServiceLocal.DeleteCitizen(cit);



        }

    }

and this is the jsf file :

 <h2>Citizen Management</h2> 




                                  <p:link action="#{citizenCtr.BanCitizen()}" value="erase" >
                                    <p:ajax update="mytable"></p:ajax>
                                </p:link>

                                <p:dataTable id="mytable" border="1" value="#{citizenCtr.datamodel}"  var="citizen">
                                <f:facet name="header"> List of Citizens </f:facet>
                                 <p:column>
                                    <f:facet name="header">
                                    <h:outputText value="CIN"></h:outputText>
                                    </f:facet>
                                    <h:outputText value="#{citizen.CIN}"></h:outputText>
                                 </p:column>

                                 <p:column>
                                    <f:facet name="header">
                                    <h:outputText value="Name"></h:outputText>
                                    </f:facet>
                                   <h:outputText value="#{citizen.firstName}"></h:outputText>
                                 </p:column>

                                 <p:column>
                                      <f:facet name="header">
                                    <h:outputText value="LastName"></h:outputText>
                                    </f:facet>
                                    <h:outputText value="#{citizen.scondName}"></h:outputText>
                                 </p:column>


                                 <p:column>
                                      <f:facet name="header">
                                    <h:outputText value="Addess"></h:outputText>
                                    </f:facet>
                                    <h:outputText value="#{citizen.email}"></h:outputText>
                                 </p:column>


                                 <p:column>
                                      <f:facet name="header">
                                    <h:outputText value="Email"></h:outputText>
                                    </f:facet>
                                    <h:outputText value="#{citizen.password}"></h:outputText>
                                 </p:column>



                                <p:column>
                                      <f:facet name="header">
                                    <h:outputText value="Password"></h:outputText>
                                    </f:facet>
                                    <h:outputText value="#{citizen.adresse}"></h:outputText>

                                 </p:column>

                                  <p:column>
                                  <p:commandButton  action="#{citizenCtr.BanCitizen()}" value="Ban" ajax="true" update="mytable" process="@this">
                                  </p:commandButton>
                               </p:column>






                                </p:dataTable>




                                </h:body> 

asked 1 min ago

Haytham

1

Removing row from datatable