Hibernate - List属性マッピング
Listを持つ永続化クラスの保存サンプル。
キーのAnnotaion
- @ElementCollection
- @ColletionTable
- @Column
- @OrderColumn
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- ドライバ --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 接続情報 --> <property name="connection.url">jdbc:mysql://localhost/hibernate</property> <property name="connection.username">root</property> <property name="connection.password">xxxx</property> <!-- 各種設定 --> <property name="hibernate.c3p0.max_size">20</property> <property name="hibernate.c3p0.min_size">1</property> <property name="hibernate.c3p0.timeout">5000</property> <!-- プール内最大Statement --> <property name="hibernate.c3p0.max_statements">100</property> <property name="hibernate.c3p0.idle_test_period">3000</property> <property name="hibernate.c3p0.acquire_increment">2</property> <property name="hibernate.c3p0.validate">true</property> <!-- DB方言解消 --> <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> <!-- 必要に応じて表生成 --> <property name="hbm2ddl.auto">update</property> <!-- 生成SQL表示 --> <property name="show_sql">true</property> <property name="hibernate.format_sql">true</property> <!-- マッピングテーブル --> <!-- mapping class="entity.Item"/ --> <mapping class="list.Person"/> </session-factory> </hibernate-configuration>
２． Person.java
package list; import java.util.ArrayList; import java.util.List; import javax.persistence.CollectionTable; import javax.persistence.Column; import javax.persistence.ElementCollection; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.JoinColumn; import javax.persistence.OrderColumn; import javax.persistence.Table; @Entity @Table(name = "person_inf") public class Person { @Id @Column(name = "perosn_id") @GeneratedValue(strategy = GenerationType.IDENTITY) private Integer id; private String name; private int age; // 集合属性 @ElementCollection(targetClass = String.class) // マッピング表 @CollectionTable(name = "school_inf", joinColumns = @JoinColumn(name = "person_id", nullable = false)) // マッピング列 @Column(name = "school_name") // index @OrderColumn(name = "list_order") private List<String> schools = new ArrayList<>(); public void setId(Integer id) { this.id = id; } public Integer getId() { return this.id; } public void setName(String name) { this.name = name; } public String getName() { return this.name; } public void setAge(int age) { this.age = age; } public int getAge() { return this.age; } public void setSchools(List<String> schools) { this.schools = schools; } public List<String> getSchools() { return this.schools; } }
３． HibernateUtil.java
package list; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; import org.hibernate.service.ServiceRegistry; public class HibernateUtil { public static final SessionFactory sessionFactory; static { try { Configuration cfg = new Configuration().configure(); ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() .applySettings(cfg.getProperties()).build(); sessionFactory = cfg.buildSessionFactory(serviceRegistry); } catch (Throwable ex) { System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static final ThreadLocal<Session> session = new ThreadLocal<Session>(); public static Session currentSession() throws HibernateException { Session s = session.get(); if (s == null) { s = sessionFactory.openSession(); session.set(s); } return s; } public static void closeSession() throws HibernateException { Session s = session.get(); if (s != null) s.close(); session.set(null); } }
４． PersonManager.java
package list; import org.hibernate.Session; import org.hibernate.Transaction; public class PersonManager { public static void main(String[] args) { PersonManager mgr = new PersonManager(); mgr.createAndStorePerson(); HibernateUtil.sessionFactory.close(); } // Person生成＆保存 private void createAndStorePerson() { // セッション Session session = HibernateUtil.currentSession(); // TX Transaction tx = session.beginTransaction(); // Person生成 Person person = new Person(); // 属性 person.setAge(18); person.setName("佐藤君"); // 属性追加 person.getSchools().add("小学校"); person.getSchools().add("中学校"); session.save(person); tx.commit(); HibernateUtil.closeSession(); } }
実行結果
１． 表が自動生成される。
（この設定によってだ。
mysql> desc person_inf; +-----------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+--------------+------+-----+---------+----------------+ | perosn_id | int(11) | NO | PRI | NULL | auto_increment | | age | int(11) | NO | | NULL | | | name | varchar(255) | YES | | NULL | | +-----------+--------------+------+-----+---------+----------------+ 3 rows in set (0.02 sec) mysql> desc school_inf; +-------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------------+--------------+------+-----+---------+-------+ | person_id | int(11) | NO | PRI | NULL | | | school_name | varchar(255) | YES | | NULL | | | list_order | int(11) | NO | PRI | NULL | | +-------------+--------------+------+-----+---------+-------+ 3 rows in set (0.00 sec)
２． データが二つのテーブルに挿入される。
mysql> select * from person_inf; +-----------+-----+-----------+ | perosn_id | age | name | +-----------+-----+-----------+ | 1 | 18 | 佐藤君 | +-----------+-----+-----------+ 1 row in set (0.00 sec) mysql> select * from school_inf; +-----------+-------------+------------+ | person_id | school_name | list_order | +-----------+-------------+------------+ | 1 | 小学校 | 0 | | 1 | 中学校 | 1 | +-----------+-------------+------------+ 2 rows in set (0.00 sec)
