求助！在Hibernate的TestUnit中插入对象时报错：“Caused by: java.sql.SQLException: 违反了 PRIMARY KEY 约束'PK_book'。不能在对象 'b

leafxx 2005-04-14 06:49:33

使用Middlegen-Hibernate-r5，hbm2java.bat生成的.hbm.xml和Java文件

但在Hibernate的TestUnit中插入对象时报错：
“Caused by: java.sql.SQLException: 违反了 PRIMARY KEY 约束'PK_book'。不能在对象 'book' 中插入重复键。”

下面是我的代码：
/*
* Created on 2005-3-20 dahe
*/
package org.hibernate.sample;

import java.util.List;

import net.sf.hibernate.*;
import junit.framework.*;
import org.hibernate.sample.Book;
import net.sf.hibernate.cfg.*;

public class HibernateTest extends TestCase {
Session session = null;
protected void setUp() {
try {
Configuration config = new Configuration().configure();
SessionFactory sessionFactory = config.buildSessionFactory();
session = sessionFactory.openSession();
} catch (HibernateException e) {
e.printStackTrace();
}
}

protected void tearDown() {
try {
session.close();
} catch (HibernateException e) {
e.printStackTrace();
}
}

public void testInsert() {
try {
Book book = new Book();
book.setBook("newbook"); //已经换了几次不同的名称，仍然说是重复插入
book.setSn("aaa");
Transaction tran=session.beginTransaction();
session.save(book);
tran.commit();
} catch (HibernateException e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
}

public void testSelect() {
String hql = "FROM Book where book='Hibernate'";
try {
List bookList = session.find(hql);
Book theBook = (Book) bookList.get(0);
Assert.assertEquals(theBook.getBook(), "Hibernate");
} catch (HibernateException e) {
e.printStackTrace();
Assert.fail(e.getMessage());
}
}

}

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book的名称和 sn都换了不同的名称，怎么会是重复插入呢？
是不是Book.hbm.xml 或者 hibernate.cfg.xml的配置有问题呢？

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