Address.java Source code

Introduction

Here is the source code for Address.java

Source

    File:Address.java

    import javax.persistence.Entity;
    import javax.persistence.Id;

@Entity
public class Address {
    @Id
    private int id;
    private String street;
    private String city;
    private String state;
    private String zip;
    
    public int getId() {
        return id;
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    public String getStreet() {
        return street;
    }
    
    public void setStreet(String address) {
        this.street = address;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getState() {
        return state;
    }

    public void setState(String state) {
        this.state = state;
    }

    public String getZip() {
        return zip;
    }

    public void setZip(String zip) {
        this.zip = zip;
    }
    public String toString() {
        return "Address id: " + getId() + 
               ", street: " + getStreet() +
               ", city: " + getCity() +
               ", state: " + getState() +
               ", zip: " + getZip();
    }

}

    File:Student.java

    import javax.persistence.CascadeType;
    import javax.persistence.Entity;
    import javax.persistence.Id;
    import javax.persistence.ManyToOne;

@Entity
public class Student {
    @Id
    private int id;
    private String name;
    
    @ManyToOne(cascade=CascadeType.PERSIST)
    Address address;

    public int getId() {
        return id;
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }

    public Address getAddress() {
        return address;
    }
    
    public void setAddress(Address address) {
        this.address = address; 
    }

    public String toString() {
        return "Student id: " + getId() + " name: " + getName() +
               " with " + getAddress();
    }
}

    File:Helper.java

    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.ResultSet;
    import java.sql.ResultSetMetaData;
    import java.sql.Statement;

public class Helper {
  public static void checkData() throws Exception {
    Class.forName("org.hsqldb.jdbcDriver");
    Connection conn = DriverManager.getConnection("jdbc:hsqldb:data/tutorial", "sa", "");
    Statement st = conn.createStatement();

    ResultSet mrs = conn.getMetaData().getTables(null, null, null, new String[] { "TABLE" });
    while (mrs.next()) {
      String tableName = mrs.getString(3);
      System.out.println("\n\n\n\nTable Name: "+ tableName);

      ResultSet rs = st.executeQuery("select * from " + tableName);
      ResultSetMetaData metadata = rs.getMetaData();
      while (rs.next()) {
        System.out.println(" Row:");
        for (int i = 0; i < metadata.getColumnCount(); i++) {
          System.out.println("    Column Name: "+ metadata.getColumnLabel(i + 1)+ ",  ");
          System.out.println("    Column Type: "+ metadata.getColumnTypeName(i + 1)+ ":  ");
          Object value = rs.getObject(i + 1);
          System.out.println("    Column Value: "+value+"\n");
        }
      }
    }
  }
}

    File:Main.java

    import java.util.List;

    import javax.persistence.EntityManager;
    import javax.persistence.EntityManagerFactory;
    import javax.persistence.Persistence;
    import javax.persistence.Query;

    public class Main {
        static EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPAService");
        static EntityManager em = emf.createEntityManager();

        public static void main(String[] a) throws Exception {
            em.getTransaction().begin();

            Student emp = new Student();
            emp.setId(1);
            emp.setName("name");
            Address addr = new Address();
            addr.setId(1);
            addr.setStreet("street");
            addr.setCity("city");
            addr.setState("state");
            emp.setAddress(addr);
            em.persist(emp);

            Query query = em.createQuery("SELECT e FROM Student e");
            List<Student> list = (List<Student>) query.getResultList();
            System.out.println(list);

            query = em.createQuery("SELECT d FROM Address d");
            List<Address> dList = (List<Address>) query.getResultList();
            System.out.println(dList);

            em.getTransaction().commit();
            em.close();
            emf.close();

            Helper.checkData();
        }
    }

    File:persistence.xml

    <persistence xmlns="http://java.sun.com/xml/ns/persistence"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence"version="1.0"><persistence-unit name="JPAService"transaction-type="RESOURCE_LOCAL"><properties><property name="hibernate.dialect"value="org.hibernate.dialect.HSQLDialect"/><property name="hibernate.hbm2ddl.auto"value="update"/><property name="hibernate.connection.driver_class"value="org.hsqldb.jdbcDriver"/><property name="hibernate.connection.username"value="sa"/><property name="hibernate.connection.password"value=""/><property name="hibernate.connection.url"value="jdbc:hsqldb:data/tutorial"/></properties></persistence-unit></persistence>