org.hibernate.exception.GenericJDBCException: could not insert

今天用Myeclipse添加Hibernate来操作mysql数据库
报了这个异常：

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Hibernate: insert into cztest.books (name, author) values (?, ?)
Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not insert: [com.cz.model.Books]
	at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:126)
	at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:114)
	at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:66)
	at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:64)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2176)
	at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2656)
	at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
	at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)
	at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:321)
	at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204)
	at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:130)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
	at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
	at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
	at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
	at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:563)
	at org.hibernate.impl.SessionImpl.save(SessionImpl.java:551)
	at org.hibernate.impl.SessionImpl.save(SessionImpl.java:547)
	at com.cz.test.UserTest.main(UserTest.java:30)
Caused by: java.sql.SQLException: Field 'id' doesn't have a default value
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1936)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2542)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2019)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1937)
	at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1922)
	at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
	at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
	... 16 more

解决办法：

将主键id设成：auto increment

详情见上传附件

 

注：

Books.hbm.xml:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="com.cz.model.Books" table="books" catalog="cztest">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native " />
        </id>
        <property name="name" type="java.lang.String">
            <column name="name" length="64" />
        </property>
        <property name="author" type="java.lang.String">
            <column name="author" length="64" />
        </property>
    </class>
</hibernate-mapping>

 

评论

3 楼 qq672076266 2013-03-19  

学习开源的东西，需要慢慢扣细节，没有什么简单不简单，又不是写什么复杂的逻辑。

2 楼 chenzheng8975 2012-09-04  

hejianmingwshjmcj 写道

感觉和你简单，菜鸟问题呀

任何问题在你知道答案之后你都会觉得好简单，关键在于这个探索的过程！！！！

1 楼 hejianmingwshjmcj 2012-09-04  

感觉和你简单，菜鸟问题呀