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pradeep Kundu
Access data from mysql through struts-hibernate integration
1 Answer(s)      2 years and 7 months ago
Posted in : Hibernate


Hi friends, I am making a program in which I want to access data from mysql through struts-hibernate integration. My search command is working properly but my delete and insert command gives output correctly but they don't update mysql table. Here is my program coding :

hibernate.cfg.xml: my configuration file

org.hibernate.dialect.MySQLDialect com.mysql.jdbc.Driver jdbc:mysql://localhost:3306/employee root 1234 10 true org.hibernate.dialect.MySQLDialect update save

hibernate.hbm.xml my mapping file

InsertDataAction.java My insert data action class

/* * To change this template, choose Tools | Templates * and open the template in the editor. */

package com.myapp.struts;

import java.sql.SQLException;

import org.hibernate.Query; import javax.servlet.ServletContext; import org.hibernate.SessionFactory; import org.hibernate.Session; import org.hibernate.cfg.Configuration; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionMessage; /** * * @author pradeep.kundu */ public class InsertDataAction extends Action {

private static final String SUCCESS = "success";
private static final String FAILURE = "failure";

boolean flag; @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { ActionErrors errors = new ActionErrors(); InsertDataForm idf = new InsertDataForm(); Integer userId = idf.getuserId(); String firstName = idf.getfirstName(); String lastName = idf.getlastName(); Integer age = idf.getage(); Long number = idf.getnumber(); Session session = null; System.out.println("Getting session factory"); /*Get the servlet context */ try { Configuration cfg = new Configuration(); cfg.configure("hibernate.cfg.xml"); ServletContext context = request.getSession().getServletContext(); /*Retrieve Session Factory */ SessionFactory _factory = (SessionFactory) context.getAttribute(HibernatePlugIn.SESSIONFACTORYKEY); /*Open Hibernate Session */ session = _factory.openSession();

     String str = "INSERT INTO emp(userId,`firstName`,`lastName`,age,number)"
                    + " VALUES (?,?,?,?,?) ";
     Query query = session.createSQLQuery(str);
      query.setParameter(0,userId);
      query.setParameter(1,firstName);
      query.setParameter(2,lastName);
      query.setParameter(3,age);
      query.setParameter(4,number);
      int row = query.executeUpdate();
     // session.save(query);
      session.close();
       saveErrors(request, errors);
    if (errors.isEmpty()) {
        flag = true;
    } else {
        flag = false;
    }
   }
   catch (Exception ex) {
        errors.add("SQLException", new ActionMessage("error.SQLException"));
        throw new SQLException(ex.fillInStackTrace());
    }

    if (flag == true ) {
        return mapping.findForward(SUCCESS);
    } else {
        return mapping.findForward(FAILURE);
    }

} }

DeleteDataAction.java my delete data action class

/* * To change this template, choose Tools | Templates * and open the template in the editor. */

/* * To change this template, choose Tools | Templates * and open the template in the editor. */

package com.myapp.struts;

import org.hibernate.SessionFactory; import org.hibernate.Session;

import org.hibernate.Query;

import org.hibernate.cfg.Configuration; import javax.servlet.ServletContext; import java.util.List; import java.util.ArrayList;

import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping;

/** * * @author pradeep.kundu */ public class DeleteDataAction extends Action {

private static final String SUCCESS = "success";
private static final String FAILURE = "failure";

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
        HttpServletRequest request, HttpServletResponse response)
        throws Exception {
         List<String> listM = new ArrayList<String>();
         DeleteDataForm sdf = (DeleteDataForm)form;
         Integer userId= sdf.getuserId();

         System.out.println("Getting session factory");

/*Get the servlet context */ ServletContext context = request.getSession().getServletContext(); Session session = null; try { Configuration cfg = new Configuration(); cfg.configure("hibernate.cfg.xml"); /*Retrieve Session Factory */ SessionFactory _factory = (SessionFactory) context.getAttribute(HibernatePlugIn.SESSIONFACTORYKEY); /*Open Hibernate Session */ session = _factory.openSession();

String str = "delete from emp where userId = ? "; Query query = session.createSQLQuery(str); query.setParameter(0,userId); //session.delete("from emp where userId ="+userId); int row = query.executeUpdate(); if (row != 0){ listM.add("Record is successfully deleted");} else { listM.add("User Id not exit"); }
/*Close session */ session.close(); System.out.println("Hibernate Session Closed"); } catch(Exception e){ System.out.println(e.getMessage()); } request.setAttribute("listM", listM); return mapping.findForward(SUCCESS); } }

SearchDataAction.java search action class

/* * To change this template, choose Tools | Templates * and open the template in the editor. */

package com.myapp.struts;

import org.hibernate.SessionFactory; import org.hibernate.Session; import org.hibernate.criterion.Restrictions; import org.hibernate.Criteria;

import javax.servlet.ServletContext; import java.util.List;

import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping;

/** * * @author pradeep.kundu */ public class SearchDataAction extends Action {

private static final String SUCCESS = "success";
private static final String FAILURE = "failure";

@Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
        HttpServletRequest request, HttpServletResponse response)
        throws Exception {

         SearchDataForm sdf = (SearchDataForm)form;

         System.out.println("Getting session factory");

/*Get the servlet context */ ServletContext context = request.getSession().getServletContext(); /*Retrieve Session Factory */ SessionFactory _factory = (SessionFactory) context.getAttribute(HibernatePlugIn.SESSIONFACTORYKEY); /*Open Hibernate Session */ Session session = _factory.openSession(); //Criteria Query Example Criteria crit = session.createCriteria(Emp.class); crit.add(Restrictions.like("userId", sdf.getuserId())); //Fetch the result from database List tutorials= crit.list(); request.setAttribute("searchresult",tutorials); /*Close session */ session.close(); System.out.println("Hibernate Session Closed");

    return mapping.findForward(SUCCESS);

} }

HibernatePlugin.java plugin file

package com.myapp.struts;

import java.net.URL; import javax.servlet.ServletContext; import javax.servlet.ServletException; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.struts.action.ActionServlet; import org.apache.struts.action.PlugIn; import org.apache.struts.config.ModuleConfig; import org.hibernate.HibernateException;

public class HibernatePlugIn implements PlugIn { private String _configFilePath = "/hibernate.cfg.xml";

/**
 * the key under which the <code>SessionFactory</code> instance is stored
 * in the <code>ServletContext</code>.
 */
public static final String SESSION_FACTORY_KEY 
        = SessionFactory.class.getName();

private SessionFactory _factory = null;

public void destroy() { try{ _factory.close(); }catch(HibernateException e){ System.out.println("Unable to close Hibernate Session Factory: " + e.getMessage()); }

}

public void init(ActionServlet servlet, ModuleConfig config) throws ServletException { System.out.println("***********"); System.out.println("* Initilizing HibernatePlugIn ***"); Configuration configuration = null; URL configFileURL = null; ServletContext context = null;

 try{
        configFileURL = HibernatePlugIn.class.getResource(_configFilePath);
        context = servlet.getServletContext();
        configuration = (new Configuration()).configure(configFileURL);
        _factory = configuration.buildSessionFactory();
        //Set the factory into session
        context.setAttribute(SESSION_FACTORY_KEY, _factory);

 }catch(HibernateException e){
    System.out.println("Error while initializing hibernate: " + e.getMessage());
 }
 System.out.println("*************************************");

}

/**
 * Setter for property configFilePath.
 * @param configFilePath New value of property configFilePath.
 */
public void setConfigFilePath(String configFilePath) {
    if ((configFilePath == null) || (configFilePath.trim().length() == 0)) {
        throw new IllegalArgumentException(
                "configFilePath cannot be blank or null.");
    }

    System.out.println("Setting 'configFilePath' to '"  + configFilePath + "'...");
    _configFilePath = configFilePath;
}

/*(SessionFactory) servletContext.getAttribute (HibernatePlugIn.SESSIONFACTORYKEY); */

}

Please tell me solution as soon as possible

Thanks & Regards Pradeep Kundu


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May 11, 2012 at 3:56 PM


Please visit the following link:

http://www.roseindia.net/struts/struts-hibernate/



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