出错问题:
这里为什么无法插入数据啊。请求解答!
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.exception.GenericJDBCException: could not insert: [com.Login]
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:1986)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2405)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:37)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:269)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:530)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:518)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:514)
at dao.UserDaoImplTest.main(UserDaoImplTest.java:27)
Caused by: java.sql.SQLException: Field 'Id' doesn't have a default value
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2901)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1584)
at com.mysql.jdbc.Connection.serverExecute(Connection.java:4742)
at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1251)
at com.mysql.jdbc.ServerPreparedStatement.executeIntern测试类
package dao;import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;import com.Login;public class UserDaoImplTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub SessionFactory sf=new Configuration().configure().buildSessionFactory();
Session session=sf.openSession();
Login login=new Login();
login.setId(7);
login.setName("liujin");
login.setPassword("123");
try {
Transaction tx=session.beginTransaction();
session.save(login);
tx.commit();
} catch (HibernateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{ session.close();}
}
}
配置文件
<?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.Login" table="login" catalog="test">
<id name="id" type="java.lang.Integer">
<column name="Id" />
<generator class="native"></generator>
</id>
<property name="name" type="java.lang.String">
<column name="Name" length="15" not-null="true" />
</property>
<property name="password" type="java.lang.String">
<column name="password" length="2" not-null="true" />
</property>
</class>
</hibernate-mapping>实体类public class Login implements java.io.Serializable { // Fields private Integer id;
private String name;
private String password;
省了set和get方法。
这里为什么无法插入数据啊。请求解答!
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
org.hibernate.exception.GenericJDBCException: could not insert: [com.Login]
at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:1986)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2405)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:37)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:269)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:167)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:530)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:518)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:514)
at dao.UserDaoImplTest.main(UserDaoImplTest.java:27)
Caused by: java.sql.SQLException: Field 'Id' doesn't have a default value
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2901)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1584)
at com.mysql.jdbc.Connection.serverExecute(Connection.java:4742)
at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1251)
at com.mysql.jdbc.ServerPreparedStatement.executeIntern测试类
package dao;import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;import com.Login;public class UserDaoImplTest {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub SessionFactory sf=new Configuration().configure().buildSessionFactory();
Session session=sf.openSession();
Login login=new Login();
login.setId(7);
login.setName("liujin");
login.setPassword("123");
try {
Transaction tx=session.beginTransaction();
session.save(login);
tx.commit();
} catch (HibernateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{ session.close();}
}
}
配置文件
<?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.Login" table="login" catalog="test">
<id name="id" type="java.lang.Integer">
<column name="Id" />
<generator class="native"></generator>
</id>
<property name="name" type="java.lang.String">
<column name="Name" length="15" not-null="true" />
</property>
<property name="password" type="java.lang.String">
<column name="password" length="2" not-null="true" />
</property>
</class>
</hibernate-mapping>实体类public class Login implements java.io.Serializable { // Fields private Integer id;
private String name;
private String password;
省了set和get方法。
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<id name="id" type="java.lang.Integer">
<column name="Id" />
<generator class="native"></generator>
</id>
column处你写成小写的id,因为我猜测可能是这个问题
你的id有问题 <id name="id" type="java.lang.Long">
<column name="Id" />
<generator class="native"></generator>
</id>
hibernate 反向生成没有java.lang.Integer
<id name="id" type="java.lang.Integer">
<column name="Id" />
<generator class="increment"></generator> </id>
主键没有自增长。
你得知道你的数据库是什么。
<hibernate-mapping> 配置里 找到id 试试改成这个
<id name="id" type="java.lang.Integer">
<column name="id" />
<generator class="identity" />
</id>native:
由 Hibernate 根据使用的数据库自行判断采用 identity、hilo、sequence 其中一种作为主键生成方式。 identity:
采用数据库提供的主键生成机制。如DB2、SQL Server、MySQL 中的主键生成机制。 其他的信息请参考:
http://yuguo138.blog.163.com/blog/static/10348940201122510203677/