为什么hibernate不保存对db的更改？

Question

这是我的配置文件 的hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-configuration PUBLIC 
"-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> 
<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.bytecode.use_reflection_optimizer">false</property> 
     <property name="hibernate.connection.driver_class">org.h2.Driver</property> 
     <property name="hibernate.connection.password">1</property> 
     <property name="hibernate.connection.url"> 
      jdbc:h2:mem:test3;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false</property> 
     <property name="hibernate.connection.username">sa</property> 
     <property name="hibernate.dialect">org.hibernate.dialect.H2Dialect</property> 
     <property name="show_sql">true</property> 
     <property name="hibernate.hbm2ddl.auto"> create </property> 
     <mapping resource="user.hbm.xml"></mapping> 
     <mapping resource="role.hbm.xml"></mapping> 
    </session-factory> 
</hibernate-configuration> 

当第一运行此代码

session.beginTransaction();

User stock = new User(); 
     User stock1 = new User(); 
     Role role = new Role(); 
     role.setId(54l); 
     role.setName("student"); 
     session.save(role); 
     stock.setBirthday(new Date(56 + 65)); 
     stock.setEmail("emaill"); 
     stock.setFirstName("dima"); 
     stock.setPassword("1"); 
     stock.setRole(role); 
     System.out.println(stock.getId()); 

     stock1.setBirthday(new Date(56 + 65)); 
     stock1.setEmail("emassill"); 
     stock1.setFirstName("dima"); 
     stock1.setPassword("1"); 
     stock1.setRole(role); 
     System.out.println(stock.getId()); 
     session.save(stock); 
     session.save(stock1); 
     session.getTransaction().commit(); 

     JdbcUserDao dao = new JdbcUserDao(); 
     System.out.println(dao.findByEmail("emassill").getFirstName()); 
     System.out.println(dao.findAll().get(0).getFirstName());` 

输出是：
迪马 迪马

如果我只保存一个用户，dao.findAll().size()给出“1”，长话短说，对db的更改不保存。 这是为什么？

对于的findAll（）我使用的DriverManager.getConnection（）等使用jdbcUserDao

@Override 
public List<User> findAll() { 
    List<User> result = new ArrayList<User>(); 
    try { 
     connection = createConnection(); 
     connection.setAutoCommit(false); 
     statement = connection.createStatement(); 
     resultSet = statement.executeQuery(FIND_ALL); 
     while (resultSet.next()) { 
      User temp = new User(); 
      temp.setId(resultSet.getLong(8)); 
      temp.setLogin(resultSet.getString(2)); 
      temp.setPassword(resultSet.getString(3)); 
      temp.setEmail(resultSet.getString(4)); 
      temp.setFirstName(resultSet.getString(5)); 
      temp.setLastName(resultSet.getString(6)); 
      temp.setBirthday(resultSet.getDate(7)); 
      Role tempRole = new Role(); 
      JdbcRoleDao jdbcRoleDao = new JdbcRoleDao(); 
      tempRole = jdbcRoleDao.findById(resultSet.getLong("id_role")); 
      temp.setRole(tempRole); 
      result.add(temp); 
     } 
    } catch (SQLException e) { 
     myRollback(); 
     log.error(e, e); 
     throw new RuntimeException(e); 
    } finally { 
     close(); 
    } 
    return result; 
} 

public Connection createConnection() throws SQLException { 
    url = "jdbc:h2:mem:test3;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false";// "jdbc:h2:./first"; 
    driver = "org.h2.Driver"; 
    login = "sa"; 
    password = "1"; 
    // init(); 
    try { 

     Class.forName(driver); 
    } catch (ClassNotFoundException e) { 
     log.error(e, e); 
     throw new RuntimeException(e); 
    } 
    Connection connection = DriverManager.getConnection(url, login, 
      password); 
    RunScript.execute(url, login, password, SCHEMA, 
      Charset.forName("UTF-8"), false); 
     return connection; 
} 

我的项目，我试图用hibernateUserdao

附： 是的，有从我的控制台文本：

Hibernate: alter table USER drop constraint FK_32nqg51ic2mg57ysalv1wnmdc if exists 
Hibernate: drop table ROLE if exists 
Hibernate: drop table USER if exists 
Hibernate: create table ROLE (id bigint generated by default as identity, name varchar(45) not null, primary key (id)) 
Sep 29, 2014 7:49:19 PM org.hibernate.tool.hbm2ddl.SchemaExport perform 
ERROR: HHH000389: Unsuccessful: alter table USER drop constraint FK_32nqg51ic2mg57ysalv1wnmdc if exists 
Sep 29, 2014 7:49:19 PM org.hibernate.tool.hbm2ddl.SchemaExport perform 
ERROR: Table "USER" not found; SQL statement: 
alter table USER drop constraint FK_32nqg51ic2mg57ysalv1wnmdc if exists [42102-181] 
Hibernate: create table USER (id bigint generated by default as identity, login varchar(45) not null, password varchar(45) not null, email varchar(45) not null, first_name varchar(45) not null, last_name varchar(45) not null, birthday date not null, id_role bigint not null, primary key (id)) 
Hibernate: alter table ROLE add constraint UK_9glod3qre7ighyp4ci4t6fcoy unique (name) 
Hibernate: alter table USER add constraint UK_slockai06wyhy7i5c8vnd2o31 unique (login) 
Hibernate: alter table USER add constraint UK_oso07pudw19e66bs4yp8hwpux unique (email) 
Hibernate: alter table USER add constraint FK_32nqg51ic2mg57ysalv1wnmdc foreign key (id_role) references ROLE 
Sep 29, 2014 7:49:19 PM org.hibernate.tool.hbm2ddl.SchemaExport execute 
INFO: HHH000230: Schema export complete 
Hibernate: insert into ROLE (id, name) values (null, ?) 
546 
546 
Hibernate: insert into USER (id, login, password, email, first_name, last_name, birthday, id_role) values (null, ?, ?, ?, ?, ?, ?, ?) 
Hibernate: insert into USER (id, login, password, email, first_name, last_name, birthday, id_role) values (null, ?, ?, ?, ?, ?, ?, ?) 
dima 
dima 

公共类用户{ 私人长期ID; ... public String getFirstName（）{ return firstName; }

.... 

public String getPassword() { 
    return password; 
} 

public void setBirthday(Date arg0) { 
    birthday = arg0; 
} 

public void setFirstName(String arg0) { 
    firstName = arg0; 
} 

... } 角色类似

Answer 1

问题在 “hibernate.hbm2ddl.auto” 创建

在每次创建新的数据库，你启动应用程序。 必须是“更新”，而不是“创建”