无法使用休眠插入 hsql 数据库

Posted 2023-04-18

【中文标题】无法使用休眠插入 hsql 数据库

【英文标题】：Cannot insert into hsql database with hibernate

【发布时间】：2015-01-31 01:12:35

【问题描述】：

我的问题是，我尝试将一条记录添加到 HSQL 数据库中，但我不能。 真的不知道怎么解决这个问题。所有这一切都让我很恼火，因为这只是一个例子，我无法运行它。

一开始我用这个命令运行 HSQLDB 服务器：

 java -cp ../lib/hsqldb.jar org.hsqldb.server.Server --database.0 file:mydb --dbname.0 xdb 

一切正常，服务器正在运行。 现在我正在尝试以这种方式在数据库中添加一条记录：

private static void fun()     

    Configuration configuration;
    configuration = new Configuration().addResource("hibernate.cfg.xml");

    configuration.configure();

    ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
    sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    Session session = sessionFactory.openSession(); 
    Transaction transaction = session.beginTransaction(); 

    Employee employee = new Employee();  
    employee.setName("Please"); 
    employee.setSurname("work !"); 
    employee.setEmployeeType(EmployeeType.DOCTOR); 
    employee.setSalary(10500); 
    employee.addRoom(23);
    employee.setOfficeLocation("ASDASDAS 4p,rom. 102"); 

    session.save(employee);
    transaction.commit();  
    session.close(); 

 

这是我的配置：

<hibernate-configuration>
<session-factory> 
     <!-- Database connection settings -->
    <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
    <property name="connection.url">jdbc:hsqldb:hsql://localhost:9001/mydb/xdb</property>
    <property name="connection.username">sa</property>
    <property name="connection.password"></property>

    <!-- JDBC connection pool (use the built-in) -->
    <property name="connection.pool_size">2</property>

    <!-- SQL dialect -->
    <property name="dialect">org.hibernate.dialect.HSQLDialect</property>

    <!-- Enable Hibernate's automatic session context management -->
    <property name="current_session_context_class">thread</property>

    <!-- Disable the second-level cache  -->
    <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

    <!-- Echo all executed SQL to stdout -->
    <property name="show_sql">true</property>

    <!-- Drop and re-create the database schema on startup -->
    <property name="hbm2ddl.auto">update</property>


     <mapping class="com.orm.project.model.Employee"/>
</session-factory>

这里是 Employee.java：

@Entity
@Table(name = "EMPLOYEE")
   public class Employee  
@Id 
@Column(name = "id") 
@GeneratedValue
   private int id;

@Column(name = "firstName") 
   private String name;   

@Column(name = "lastName")
   private String surname;   

@Column(name = "salary")
   private int salary; 

@Enumerated(EnumType.STRING) 
@Column(name = "employee_type")
   private EmployeeType employeeType;  

@ElementCollection 
@CollectionTable(name="EMPLOYEE") 
@JoinColumn(name="ROOM_ID") 
@Column(name = "assigned_rooms")
   private List<Integer> assignedRooms = new ArrayList<Integer>(); 

@Column(name = "office_location") 
    private String officeLocation; 

    // get + set methods 

终于报错了：

Hibernate: insert into EMPLOYEE (id, employee_type, firstName,     
office_location, salary, lastName) values (default, ?, ?, ?, ?, ?)
org.hibernate.exception.ConstraintViolationException: could not execute     
statementatorg.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:72)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:211)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3032)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3558)
at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:98)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:492)
at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:197)
at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:181)
at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:216)
at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:324)
at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:715)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:707)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:702)
at com.orm.project.App.fun(App.java:51)
at com.orm.project.App.main(App.java:27)
Caused by: java.sql.SQLIntegrityConstraintViolationException: integrity   
constraint violation: NOT NULL check constraint; SYS_CT_10143 table: 
EMPLOYEE column: EMPLOYEE_ID
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.fetchResult(Unknown Source)
at org.hsqldb.jdbc.JDBCPreparedStatement.executeUpdate(Unknown Source)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208)
... 23 more 

我的问题是：

如何解决这个问题？ 我正在使用 maven 构建这个项目。可以通过这种方式配置 maven 以在 taget 目录中创建数据库和所有需要的文件？我希望将所有项目都放在根目录中。

我真的很感激任何帮助。

最好的问候，

彼得

【参考方案1】：

问题似乎出在您的生成策略上。使用序列而不是 @GeneratedValue。像这样：

@SequenceGenerator(name="EMPLOYEE_GENERATOR",sequenceName="SEQ_EMPLOYEE",allocationSize=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="EMPLOYEE_GENERATOR")

希望对你有帮助！

【讨论】：

不幸的是它没有帮助。仍然是“相同”的错误。 :(

您是否有任何方法可以验证序列是否已在数据库中创建？由于您将属性“hbm2ddl.auto”设置为“update”，因此如果在启动时创建序列失败，日志中应该会出现警告。

我确定不是。如果您在此日志中看到：pastebin.com/frEhJfpc 您也会看到。

好的，看看那个日志，你显然有映射问题。消息 NOT NULL 检查约束； SYS_CT_10093 表：EMPLOYEE 列：EMPLOYEE_ID 声明您的 ID 列称为 EMPLOYEE_ID，但是，您正在映射：@Column(name = "id")。尝试更改您要映射的列的名称，看看效果如何。

是的，现在一切正常 :) 谢谢 Kikin-Sama :)