ERROR: Field 'PostId' doesn't have a default value Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not execute statement

　　例子：　　　　

Post p = new Post();

p.setPostId(3);

p.setPostName("技术");

在执行数据保持时提示session.save(p); 的错误。

INFO: HHH000232: Schema update complete

Hibernate: insert into Post (postName) values (?)

八月 19, 2018 5:07:17 下午 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions

WARN: SQL Error: 1364, SQLState: HY000

八月 19, 2018 5:07:17 下午 org.hibernate.engine.jdbc.spi.SqlExceptionHelper logExceptions

ERROR: Field 'PostId' doesn't have a default value

Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not execute statement

    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)

    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:190)

    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:97)

    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:488)

    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:193)

    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:177)

    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:212)

    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)

控制台出现的错误

　解决问题步骤：

查看Post.hbm.xml 文件

 <class name="hibernate.model.Post" table="Post">

        <id name="postId">

            <!-- 主键生成策略 -->

            <generator class="native"></generator>

        </id>

        <property name="postName"/>

2.

    <generator class="native"></generator>

　　3. 删掉。

　　4. 重新运行。

　原因：

　　Post.hbm,xml配置文件里的<generator class="native"></generator>对主键已经默认赋值了，在Post.java里在插入语句，造成冲突，所以出错。

巴特西

ERROR: Field 'PostId' doesn't have a default value Exception in thread "main" org.hibernate.exception.GenericJDBCException: could not execute statement

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