Java by API/javax.persistence/GeneratedValue

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GeneratedValue.generator()

   <source lang="java">
 

File: Address.java import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.TableGenerator; @Entity public class Address {

 @TableGenerator(name = "Address_Gen", table = "ID_GEN", pkColumnName = "GEN_NAME", valueColumnName = "GEN_VAL", pkColumnValue = "Addr_Gen", initialValue = 10000, allocationSize = 100)
 @Id
 @GeneratedValue(strategy = GenerationType.TABLE, generator = "Address_Gen")
 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.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.OneToOne; import javax.persistence.TableGenerator; @Entity public class Student {

 @TableGenerator(name = "Emp_Gen", table = "ID_GEN", pkColumnName = "GEN_NAME", valueColumnName = "GEN_VAL")
 @Id
 @GeneratedValue(strategy = GenerationType.TABLE, generator = "Emp_Gen")
 private int id;
 private String name;
 @OneToOne
 private 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 "\n\nID:" + id + "\nName:" + name + "\n\n";
 }

}

File: Main.java import java.sql.Timestamp; import java.util.List; import java.util.UUID; 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 student = new Student();
   student.setName("Joe");
   Address address = new Address();
   em.persist(address);
   
   student.setAddress(address);
     
   em.persist(student);
   em.flush();
   em.getTransaction().rumit();
   
   Query query = em.createQuery("SELECT e FROM Student e");
   List<Student> list = (List<Student>) query.getResultList();
   System.out.println(list);
   
   
   em.close();
   emf.close();
   
   Helper.checkData();
 }

}

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: persistence.xml <persistence xmlns="http://java.sun.ru/xml/ns/persistence"

            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://java.sun.ru/xml/ns/persistence http://java.sun.ru/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>


 </source>
   
  
 
  



GeneratedValue: strategy()

   <source lang="java">
 

File: Address.java import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.TableGenerator; @Entity public class Address {

 @TableGenerator(name = "Address_Gen", table = "ID_GEN", pkColumnName = "GEN_NAME", valueColumnName = "GEN_VAL", pkColumnValue = "Addr_Gen", initialValue = 10000, allocationSize = 100)
 @Id
 @GeneratedValue(strategy = GenerationType.TABLE, generator = "Address_Gen")
 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.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.OneToOne; import javax.persistence.TableGenerator; @Entity public class Student {

 @TableGenerator(name = "Emp_Gen", table = "ID_GEN", pkColumnName = "GEN_NAME", valueColumnName = "GEN_VAL")
 @Id
 @GeneratedValue(strategy = GenerationType.TABLE, generator = "Emp_Gen")
 private int id;
 private String name;
 @OneToOne
 private 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 "\n\nID:" + id + "\nName:" + name + "\n\n";
 }

}

File: Main.java import java.sql.Timestamp; import java.util.List; import java.util.UUID; 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 student = new Student();
   student.setName("Joe");
   Address address = new Address();
   em.persist(address);
   
   student.setAddress(address);
     
   em.persist(student);
   em.flush();
   em.getTransaction().rumit();
   
   Query query = em.createQuery("SELECT e FROM Student e");
   List<Student> list = (List<Student>) query.getResultList();
   System.out.println(list);
   
   
   em.close();
   emf.close();
   
   Helper.checkData();
 }

}

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: persistence.xml <persistence xmlns="http://java.sun.ru/xml/ns/persistence"

            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="http://java.sun.ru/xml/ns/persistence http://java.sun.ru/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>


 </source>