Hibernate 自动建表时出现的错误

最新推荐文章于 2023-07-26 18:29:59 发布

wfwkiss

最新推荐文章于 2023-07-26 18:29:59 发布

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分类专栏： Hibernate 文章标签： Hibernate Java MySQL JDBC Bean

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[b]Person.hbm.xml映射文件[/b]


<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="org.com.hs.bean">
	<class name="Person">
		<id name="id">
			<generator class="native"></generator>
		</id>
		<property name="name"/>
		<property name="score"/>
		<property name="date"/>
	</class>
</hibernate-mapping>

[b]Test.java （主程序测试类）:[/b]


package org.com.hs.test;

import java.util.Date;

import org.com.hs.bean.Person;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class Test {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Configuration cfg = new Configuration();
		cfg.configure();

		//创建SchemaExport对象
		SchemaExport export = new SchemaExport(cfg);
		//创建数据库表
		export.create(true, true); 

		SessionFactory sf = cfg.buildSessionFactory();
		Session session = sf.openSession();
		Transaction ts = session.beginTransaction();

		Person person = new Person();
		person.setDate(new Date());
		person.setName("李四");
		person.setScore(Float.parseFloat("1.54"));

		session.save(person);
		ts.commit();
		session.close();
		System.out.println("END");
		sf.close();
	}

}

[b]hibernate.cfg.xml （Hibernate 配置文件）[/b]


<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
    	<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    	<property name="hibernate.connection.url">jdbc:mysql:///test</property>
    	<property name="hibernate.connection.username">root</property>
    	<property name="hibernate.connection.password">admin</property>
    	<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    	<property name="hibernate.hbm2ddl.auto">update</property>
    	<property name="hibernate.show_sql">true</property>
    	<mapping resource="org/com/hs/bean/Person.hbm.xml" />
    </session-factory>

</hibernate-configuration>

[b]对应表文件Person.java[/b]


package org.com.hs.bean;

import java.util.Date;

public class Person {

	private String id;
	private String name;
	private float score;
	private Date date;

	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public float getScore() {
		return score;
	}
	public void setScore(float score) {
		this.score = score;
	}
	public Date getDate() {
		return date;
	}
	public void setDate(Date date) {
		this.date = date;
	}
}

[b]出错信息：[/b]
drop table if exists Person
create table Person (id varchar(255) not null auto_increment, name varchar(255), score float, date datetime, primary key (id))
Hibernate: insert into Person (name, score, date) values (?, ?, ?)
Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not insert: [org.com.hs.bean.Person]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:90)
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 org.com.hs.test.Test.main(Test.java:35)
Caused by: com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: Table 'test.person' doesn't exist
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2870)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1573)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1665)
at com.mysql.jdbc.Connection.execSQL(Connection.java:3176)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1153)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1404)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1318)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1303)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
... 16 more
[b]解决办法：[/b]

Person.java 文件中ID 应该为int类型，自增无法是String


package org.com.hs.bean;

import java.util.Date;

public class Person {

	private int id;
	private String name;
	private float score;
	private Date date;

	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public float getScore() {
		return score;
	}
	public void setScore(float score) {
		this.score = score;
	}
	public Date getDate() {
		return date;
	}
	public void setDate(Date date) {
		this.date = date;
	}
}