Github user imesh commented on a diff in the pull request:
https://github.com/apache/stratos/pull/408#discussion_r35725641
--- Diff:
components/org.apache.stratos.manager/src/main/java/org/apache/stratos/manager/Persistence/PersistenceManager.java
---
@@ -0,0 +1,259 @@
+package org.apache.stratos.manager.Persistence;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import javax.persistence.*;
+
+import java.util.*;
+/**
+ * Created by aarthy on 7/27/15.
+ */
+public class PersistenceManager {
+
+ private static final Log log;
+
+ static {
+ log = LogFactory.getLog(PersistenceManager.class);
+ }
+
+ private EntityManagerFactory entitymanagerFactory =
Persistence.createEntityManagerFactory("PersistenceUnit");
+
+ private static final PersistenceManager instance = new
PersistenceManager();
+
+ EntityManager entityManager = null;
+
+
+ public static PersistenceManager getInstance() {
+ return instance;
+ }
+
+
+ /**
+ * Add object to persist
+ * @param object
+ * @throws PersistenceException
+ */
+ public void add(Object object)
+ {
+ System.out.printf("entered");
+
+ System.out.printf("true");
+ try {
+ entityManager =
this.entitymanagerFactory.createEntityManager();
+ entityManager.getTransaction().begin();
+ entityManager.persist(object);
+ entityManager.flush();
+ entityManager.getTransaction().commit();
+ String msg="Added Successfully";
+ log.info(msg);
+ }
+ catch (PersistenceException e)
+ {
+ String msg="Error while adding";
+ log.error(msg);
+ }
+
+ }
+
+
+ /**
+ * remove object by primary key
+ * @param object
+ * @param primaryKey
+ * @throws PersistenceException
+ */
+
+ public void remove(Object object,Object primaryKey)
+ {
+ try {
+ entityManager =
this.entitymanagerFactory.createEntityManager();
+ entityManager.getTransaction().begin();
+ Object found=entityManager.find(object.getClass(), primaryKey);
+ if(found!=null) {
+ entityManager.remove(found);
+ entityManager.getTransaction().commit();
+ String msg = "Deleted sucessfully";
+ log.info(msg);
+ }
+ else
+ {
+ String msg ="Object does not exists";
+ log.error(msg);
+ }
+ }
+ catch (PersistenceException e)
+ {
+
+ String msg="Error while Deleting";
+ log.error(msg);
+ }
+
+ }
+
+ /**
+ * retrieve an object by primary key
+ * @param object
+ * @param primaryKey
+ * @return
+ */
+
+ public Object retrieve(Object object,Object primaryKey)
+ {
+ Object found=null;
+ try{
+
+ entityManager=this.entitymanagerFactory.createEntityManager();
+ entityManager.getTransaction().begin();
+ found= entityManager.find(found.getClass(), primaryKey);
+ if(found!=null)
+ log.info("Object Found");
+ else
+ log.error("Object not Found");
+ return found;
+
+ }
+ catch (PersistenceException e)
+ {
+
+ String msg="Error while retrieving";
+ log.error(msg);
+ return found;
+ }
+
+ }
+
+ /**
+ *
+ * @param tableName
+ * @return
+ */
+
+
+ public List retrieveAll(String tableName)
+ {
+ List objectList=new ArrayList<Object>();
+ try{
+
+ entityManager=this.entitymanagerFactory.createEntityManager();
+ entityManager.getTransaction().begin();
+ String msg="Successfully retrieved";
+
+ objectList= entityManager.createQuery("select obj from
"+tableName+" obj" ).getResultList();
+
+ if(objectList!=null)
+ {
+ log.info(msg);
+ return objectList;
+ }
+ else
+ return null;
+
+ }
+ catch (javax.persistence.PersistenceException e)
+ {
+ String msg="Object not found";
+ System.out.println(msg);
+ return null;
+ }
+
+ }
+
+ /**
+ *
+ * @param object
+ * @param primaryKey
+ * @param setValues
+ * @param whereValues
+ */
+
+ public void update(Object object,Object primaryKey,Map<String,Object>
setValues,Map<String,Object> whereValues)
+ {
+ String setQuery="";
+ String updateQuery="";
+ String whereQuery="";
+
+ try {
+
+ Object foundObject =retrieve(object,primaryKey);
+
+ if(foundObject!=null)
+ {
+
+ String query ="Update "+ object +" obj Set ";
+ int count =0;
+ for (String key : setValues.keySet()) {
+ setQuery += "obj."+key + "=";
+
+ if(setValues.get(key)instanceof String)
+ {
+ setQuery+="'"+setValues.get(key)+"'";
+ }
+ else
+ {
+ setQuery+=setValues.get(key);
+ }
+
+ count++;
+ if(setValues.size()>1 && count!=setValues.size())
+ {
+ setQuery+=",";
+ }
+ }
+ updateQuery=query+setQuery+" Where ";
--- End diff --
Why do we construct SQL queries when using an ORM?
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