请教问题

来源：互联网发布：js转化成数字编辑：程序博客网时间：2024/04/30 23:28

请教问题如下：

（下面是进行的双向的多对多的关联关系进行拆分的测试，拆分成两个多对一的关联，但是没有成功的一步就是：只是生成了两张表，还有一张ORDER表没有生成，请教原因还修改的方式，谢了）

【POJO类】

package qau.edu.ren;

import java.util.Date;

import java.util.HashSet;

import java.util.Set;

public class Order {

private int id ;

private Date date ;

private String name ;

private Set<Op> ops = new HashSet<Op>();

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Set<Op> getOps() {

return ops;

}

public void setOps(Set<Op> ops) {

this.ops = ops;

}

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package qau.edu.ren;

import java.util.Date;

import java.util.HashSet;

import java.util.Set;

public class Product {

private int id ;

private String name ;

private Date date ;

private Set<Op> op = new HashSet<Op>();

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 Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

public Set<Op> getOp() {

return op;

}

public void setOp(Set<Op> op) {

this.op = op;

}

package qau.edu.ren;

import java.util.Date;

public class Op {

private int id ;

private double price ;

private Date date ;

private Order orders ;

private Product pros ;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

public Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

public Order getOrders() {

return orders;

}

public void setOrders(Order orders) {

this.orders = orders;

}

public Product getPros() {

return pros;

}

public void setPros(Product pros) {

this.pros = pros;

}

【关系映射文件】

<?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>

</id>

</property>

</property>

<many-to-one name="orders" class="qau.edu.ren.Order" fetch="join">

</many-to-one>

<many-to-one name="pros" class="qau.edu.ren.Product" fetch="join">

</many-to-one>

</class>

</hibernate-mapping>

***********************************************************************************************************************************************************************************************************************************************

<?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>

</id>

</property>

</property>

<key>

</key>

<one-to-many class="qau.edu.ren.Op" />

</set>

</class>

</hibernate-mapping>

<?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>

</id>

</property>

</property>

<key>

</key>

<one-to-many class="qau.edu.ren.Op" />

</set>

</class>

</hibernate-mapping>

【配置文件】

<?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.dialect">org.hibernate.dialect.MySQLDialect</property>

<property name="hbm2ddl.auto">update</property>

</session-factory>

</hibernate-configuration>

【测试类】

package qau.edu.ren;

import java.util.Date;

import org.hibernate.Session;

import org.hibernate.Transaction;

import org.hibernate.cfg.Configuration;

public class Test {

public static void main(String[] args) {

Session session = new Configuration().configure().buildSessionFactory()

.openSession();

Transaction tr = session.beginTransaction();

Order or = new Order();

or.setDate(new Date());

or.setName("AA");

Product pro = new Product();

pro.setDate(new Date());

pro.setName("BB");

Op op = new Op();

op.setDate(new Date());

op.setPrice(2232.22);

or.getOps().add(op);

pro.getOp().add(op);

session.save(pro);

session.save(or);

session.save(op);

tr.commit();

session.close();

}

【出现的错误：】

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Hibernate:
insert
into
PRODUCT
(P_NAME, P_DATE)
values
(?, ?)
Hibernate:
insert
into

ORDER (O_DATE
, O_NAME)
values
(?, ?)
Exception in thread "main" org.hibernate.exception.SQLGrammarException: could not insert: [qau.edu.ren.Order]
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:92)
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:2329)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2836)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:268)
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:705)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:693)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:689)
at qau.edu.ren.Test.main(Test.java:39)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ORDER (O_DATE, O_NAME) values ('2014-11-12 22:30:17.0', 'AA')' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.Util.getInstance(Util.java:381)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3558)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3490)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1959)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2109)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2648)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2077)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2362)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2280)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2265)
at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:94)
at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:57)
... 16 more

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