[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; }}
