wmuron

public class ReadDateZeroWithJDBC {
    public static void main(String args[]) throws ClassNotFoundException, SQLException {
        Connection conn = setupJDBCAndConnect();

        //expected epoch unix time
        java.util.Date dateExpected = new java.util.Date(0);

        //actual created_at_utc from the user record in DB
        PreparedStatement stmtRead = createSelectStatement(conn, 1);
        ResultSet rs = stmtRead.executeQuery();

wmuron

public class User {    
    private int id;
    private String name;
    private java.util.Date createdAtUtc;

    public User(int id, String name, java.util.Date createdAtUtc) {
        this.id = id;
        this.name = name;
        this.createdAtUtc = createdAtUtc;
    }

wmuron

<hibernate-mapping>
    <class name="com.montrosesoftware.dbassist.User" table="users">
        <id name="id" type="integer">
            <column name="id" />
        </id>
        <property name="name" type="string" length="100" column="name"/>
        <property name="createdAtUtc" type="timestamp" column="created_at_utc"/>
    </class>
</hibernate-mapping>

wmuron

Configuration configuration = new Configuration().configure();
SessionFactory factory = configuration.buildSessionFactory();
Session session = factory.getCurrentSession();
Transaction transaction = session.getTransaction();
transaction.begin();

//insert one user
String sql = "INSERT INTO users (id, name, created_at_utc)"
           + "VALUES (1, 'Adam Spring', '2016-06-12 14:54:15')";
Query query = session.createSQLQuery(sql);

wmuron

Configuration configuration = new Configuration().configure();
SessionFactory factory = configuration.buildSessionFactory();
Session session = factory.openSession();
Transaction transaction = session.beginTransaction();

//prepare date
String createdAtUtcStr = "2016-04-24 9:54:23";
DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
format.setTimeZone(TimeZone.getTimeZone("UTC"));
Date date = format.parse(createdAtUtcStr);

wmuron

import org.hibernate.type.DateType;
public class UtcDateType extends DateType {

    private static final TimeZone UTC = TimeZone.getTimeZone("UTC");

    @Override
    public Object get(ResultSet rs, String name) throws SQLException {
        return rs.getDate(name, Calendar.getInstance(UTC));
    }

wmuron

...
<property name="createdAt" type="com.montrosesoftware.dbassist.types.UtcDateType" column="created_at"/>
...

wmuron

@TypeDef(name = "UtcDateType", defaultForType = Date.class, typeClass = UtcDateType.class),
package com.montrosesoftware.dbassist.types;

wmuron

CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
CriteriaQuery<User> criteriaQuery = criteriaBuilder.createQuery(User.class);
Root<User> userRoot = criteriaQuery.from(User.class);

//Specification<User> specs = (root, query, cb) ->
//        cb.equal(root.get("createdAt"), utcDate);
String paramName = "pn";
Specification<User> specs = (root, query, cb) ->
          cb.equal(root.get("createdAt"), cb.parameter(Date.class, paramName));

wmuron

ConditionsBuilder conditionsBuilder = new ConditionsBuilder();
Condition cond = conditionsBuilder.equal("createdAt", utcDate);
conditionsBuilder.apply(cond);
List<User> results = uRepo.find(conditionsBuilder);