import java.util.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.sql.Timestamp;
public class Main {
public static void main(String[] args) throws Exception{
Date parsedDate = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX").parse("2021-05-27T00:00:00-04:00");
System.out.println("Parsed Date:" +parsedDate);
package com.broadridge.sleevesmaster.hibernate.config;
package com.broadridge.sleevesmaster.hibernate;
import jakarta.persistence.ParameterMode;
import jakarta.persistence.StoredProcedureQuery;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.query.NamedProcedureCallDefinition;
import org.hibernate.jdbc.Work;
import org.hibernate.procedure.ProcedureCall;
import org.hibernate.query.Query;
import org.hibernate.resource.transaction.spi.TransactionStatus;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.CollectionUtils;
import org.springframework.util.ObjectUtils;
import java.io.Serializable;
import java.sql.BatchUpdateException;
import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
public abstract class BaseHibernateDAO<KEY extends Serializable, ENTITY extends IModel> implements IHibernateDAO<KEY, ENTITY> {
private static final Logger LOG = LoggerFactory.getLogger(BaseHibernateDAO.class);
@Autowired
private SessionFactory sessionFactory;
public ENTITY fetchById(KEY id) {
return this.getById(id);
}
protected ENTITY getById(KEY id) {
LOG.debug("Inside HibernateDAO getById");
return this.sessionFactory.getCurrentSession().get(this.getEntityClazz(), id);
}
@Override
public ENTITY insert(ENTITY entity) {
LOG.debug("Inside HibernateDAO upsert");
if (entity != null) {
this.getCurrentSession().persist(entity);
}
LOG.debug("Exiting HibernateDAO upsert");
return entity;
}
@Override
public Collection<ENTITY> insertAll(Collection<ENTITY> entities) {
LOG.debug("Inside HibernateDAO upsertAll");
if (!CollectionUtils.isEmpty(entities)) {
Iterator var2 = entities.iterator();
while (var2.hasNext()) {
ENTITY eachEntity = (ENTITY) var2.next();
this.insert(eachEntity);
}
}
LOG.debug("Exiting HibernateDAO upsertAll");
return entities;
}
@Override
public ENTITY update(ENTITY entity) {
LOG.debug("Inside HibernateDAO upsert");
if (entity != null) {
this.getCurrentSession().merge(entity);
}
LOG.debug("Exiting HibernateDAO upsert");
return entity;
}
@Override
public Collection<ENTITY> updateAll(Collection<ENTITY> entities) {
LOG.debug("Inside HibernateDAO upsertAll");
if (!CollectionUtils.isEmpty(entities)) {
Iterator var2 = entities.iterator();
while (var2.hasNext()) {
ENTITY eachEntity = (ENTITY) var2.next();
this.update(eachEntity);
}
}
LOG.debug("Exiting HibernateDAO upsertAll");
return entities;
}
public Collection<ENTITY> findByHqlAndParmas(String hql, Map<String, Object> paramsmap) {
return paramsmap != null && !paramsmap.isEmpty() ? this.findByHqlAndParmasAndGetEntity(hql, paramsmap, this.getEntityClazz()) : null;
}
public <T> Collection<T> findByHqlAndParmasAndGetEntity(String hql, Map<String, Object> paramsmap, Class<T> clazz) {
LOG.debug("Inside HibernateDAO findByHqlAndParmasAndGetEntity");
return this.findByNamedParam(hql, paramsmap, clazz);
}
protected <T> Collection<T> findByNamedParam(String sql, Map<String, Object> paramsmap, Class<T> clazz) {
LOG.debug("Inside HibernateDAO findByNamedParam");
if (paramsmap != null && !paramsmap.isEmpty()) {
String[] paramNames = new String[paramsmap.size()];
Object[] paramValues = new Object[paramsmap.size()];
int i = 0;
for (Iterator var7 = paramsmap.entrySet().iterator(); var7.hasNext(); ++i) {
Map.Entry<String, Object> eachEntry = (Map.Entry) var7.next();
paramNames[i] = eachEntry.getKey();
paramValues[i] = eachEntry.getValue();
}
Session session = this.sessionFactory.openSession();
try {
//session = this.getSession();
Query<?> sqlQuery = session.createQuery(sql, clazz);
for (int y = 0; y < paramValues.length; ++y) {
sqlQuery.setParameter(paramNames[y], paramValues[y]);
}
List var = sqlQuery.getResultList();
return var;
} catch (Exception e) {
LOG.error("Error occurred while executing sql", e);
} finally {
this.closeSession(session);
}
LOG.debug("Exiting HibernateDAO findByNamedParam");
return null;
} else {
return null;
}
}
protected abstract Class<ENTITY> getEntityClazz();
@Override
public Collection findBySql(String sql) {
return this.getSqlQuery(sql, this.getEntityClazz());
}
@Override
public Session getSession() {
return this.sessionFactory.openSession();
}
@Override
public Session getCurrentSession() {
return this.sessionFactory.getCurrentSession();
}
@Override
public void closeSession(Session session) {
if (session != null) {
session.close();
}
}
@Override
public void deleteBySql(String sql) {
LOG.debug("Inside HibernateDAO deleteBySql");
this.deleteBySqlWithParmas(sql, (Map) null);
LOG.debug("Exiting HibernateDAO deleteBySql");
}
@Override
public void deleteBySql(String sql, Map params) {
LOG.debug("Inside HibernateDAO deleteBySql");
deleteBySqlWithParmas(sql, params);
LOG.debug("Inside HibernateDAO deleteBySql");
}
private <T> Collection<T> getSqlQuery(String sql, Class<?> clazz) {
Session session = this.sessionFactory.openSession();
try {
session = this.getSession();
Query<?> sqlQuery = session.createQuery(sql, clazz);
List list = sqlQuery.getResultList();
return list;
} catch (Exception e) {
LOG.error("Error occurred while executing sql", e);
} finally {
this.closeSession(session);
}
return null;
}
private void deleteBySqlWithParmas(String sql, Map<String, Object> paramsmap) {
LOG.debug("Inside HibernateDAO deleteBySqlWithParmas");
Session session = this.sessionFactory.openSession();
try {
// session = this.getSession();
session.beginTransaction();
Query<?> query = session.createQuery(sql, (Class) Object.class);
if (!CollectionUtils.isEmpty(paramsmap)) {
paramsmap.forEach(query::setParameter);
}
query.executeUpdate();
session.getTransaction().commit();
} catch (Exception var8) {
LOG.error("Error occurred while deleting with sql records", var8);
} finally {
this.closeSession(session);
}
LOG.debug("Exiting HibernateDAO deleteBySqlWithParmas");
}
public void bulkUpsert(Collection<ENTITY> entities) {
LOG.debug("Inside HibernateDAO bulkUpsert");
if (!CollectionUtils.isEmpty(entities)) {
Session session = null;
try {
session = this.sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
int counter = 1;
try {
for (Iterator var5 = entities.iterator(); var5.hasNext(); ++counter) {
ENTITY eachEntity = (ENTITY) var5.next();
session.merge(eachEntity);
if (counter % 10 == 0) {
session.flush();
session.clear();
}
}
} catch (Exception var17) {
LOG.error("Error occurred while inserting batch records", var17);
if (this.isTransactionStatusActive(transaction)) {
transaction.rollback();
}
} finally {
if (this.isTransactionStatusActive(transaction)) {
transaction.commit();
}
}
} catch (Exception var19) {
LOG.error("Error occurred while inserting batch records", var19);
} finally {
if (session != null) {
session.close();
}
}
}
LOG.debug("Exiting HibernateDAO bulkUpsert");
}
private void addParameterToBatch(Map<String, Object> parameters, StoredProcedureQuery query) {
if (!ObjectUtils.isEmpty(parameters)) {
for (Map.Entry<String, Object> entry : parameters.entrySet()) {
String paramName = entry.getKey();
Object paramValue = entry.getValue();
query.registerStoredProcedureParameter(paramName, paramValue.getClass(), ParameterMode.IN)
.setParameter(paramName, paramValue);
}
}
}
/**
* executeStoredProc which will take only Parameter IN inputs
* @param storedProcSql
* @param parameters
*/
@Override
public void executeStoredProc(final String storedProcSql, final Map<String, Object> parameters) {
LOG.debug("Inside BaseHibernateDAO executeStoredProc");
try {
Session session = this.getCurrentSession();
ProcedureCall query = session.createStoredProcedureCall(storedProcSql);
BaseHibernateDAO.this.addParameterToBatch(parameters, query);
query.execute();
} catch (Exception e) {
BaseHibernateDAO.LOG.error("SQLException in BaseHibernateDAO.executeStoredProc : {}", e.getMessage());
throw e;
}
LOG.debug("Exiting BaseHibernateDAO executeStoredProc");
}
private boolean isTransactionStatusActive(Transaction transaction) {
return transaction.getStatus().equals(TransactionStatus.ACTIVE);
}
}
}
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Java is a very popular general-purpose programming language, it is class-based and object-oriented. Java was developed by James Gosling at Sun Microsystems ( later acquired by Oracle) the initial release of Java was in 1995. Java 17 is the latest long-term supported version (LTS). As of today, Java is the world's number one server programming language with a 12 million developer community, 5 million students studying worldwide and it's #1 choice for the cloud development.
short x = 999; // -32768 to 32767
int x = 99999; // -2147483648 to 2147483647
long x = 99999999999L; // -9223372036854775808 to 9223372036854775807
float x = 1.2;
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When ever you want to perform a set of operations based on a condition If-Else is used.
if(conditional-expression) {
// code
} else {
// code
}
Example:
int i = 10;
if(i % 2 == 0) {
System.out.println("i is even number");
} else {
System.out.println("i is odd number");
}
Switch is an alternative to If-Else-If ladder and to select one among many blocks of code.
switch(<conditional-expression>) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
//code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition. Usually for loop is preferred when number of iterations is known in advance.
for(Initialization; Condition; Increment/decrement){
//code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(<condition>){
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (<condition>);
Class is the blueprint of an object, which is also referred as user-defined data type with variables and functions. Object is a basic unit in OOP, and is an instance of the class.
class keyword is required to create a class.
class Mobile {
public: // access specifier which specifies that accessibility of class members
string name; // string variable (attribute)
int price; // int variable (attribute)
};
Mobile m1 = new Mobile();
public class Greeting {
static void hello() {
System.out.println("Hello.. Happy learning!");
}
public static void main(String[] args) {
hello();
}
}
Collection is a group of objects which can be represented as a single unit. Collections are introduced to bring a unified common interface to all the objects.
Collection Framework was introduced since JDK 1.2 which is used to represent and manage Collections and it contains:
This framework also defines map interfaces and several classes in addition to Collections.
| Collection | Description |
|---|---|
| Set | Set is a collection of elements which can not contain duplicate values. Set is implemented in HashSets, LinkedHashSets, TreeSet etc |
| List | List is a ordered collection of elements which can have duplicates. Lists are classified into ArrayList, LinkedList, Vectors |
| Queue | FIFO approach, while instantiating Queue interface you can either choose LinkedList or PriorityQueue. |
| Deque | Deque(Double Ended Queue) is used to add or remove elements from both the ends of the Queue(both head and tail) |
| Map | Map contains key-values pairs which don't have any duplicates. Map is implemented in HashMap, TreeMap etc. |