public class TESTClass implements Serializable {
...
private String name;
@EmbeddedId
protected IsstESTPK isstESTPK;
@ManyToOne(optional=false)
@JoinColumns({
@JoinColumn(name="DIVISION_CODE",referencedColumnName="DIVISION_CODE",nullable=false,insertable=false,updatable=false),@JoinColumn(name="SURVEY_NUM",referencedColumnName="SURVEY_NUM",updatable=false)})
private IssDivision issDivision;
}
如果我更改为’name’并调用merge,它可以更新到数据库,但是当我更改issDivision并调用merge时,它不会更新数据库. X- 20045 X- 20045 X- 20045 X- 20045 200：
这是否与我使用embededId(复合主键)相关？
更新
如果我设置upadted = true,我得到以下错误
ERROR - ContextLoader.initWebApplicationContext(215) | Context initialization fa
iled
org.springframework.beans.factory.BeanCreationException: Error creating bean wit
h name 'sessionFactory' defined in ServletContext resource [/WEB-INF/application
Context.xml]: Invocation of init method Failed; nested exception is org.hibernat
e.MappingException: Repeated column in mapping for entity: com.compay.test.model
.TESTClass column: SURVEY_NUM (should be mapped with insert="false" update="fa
lse")
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.initializeBean(AbstractAutowireCapablebeanfactory.java:1338)
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.doCreateBean(AbstractAutowireCapablebeanfactory.java:473)
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory$1.run(AbstractAutowireCapablebeanfactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBean
Factory.createBean(AbstractAutowireCapablebeanfactory.java:380)
at org.springframework.beans.factory.support.Abstractbeanfactory$1.getob
ject(Abstractbeanfactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistr
y.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBe
an(Abstractbeanfactory.java:261)
at org.springframework.beans.factory.support.Abstractbeanfactory.getBean
(Abstractbeanfactory.java:185)
at org.springframework.beans.factory.support.Abstractbeanfactory.getBean
(Abstractbeanfactory.java:164)
at org.springframework.beans.factory.support.DefaultListablebeanfactory.
preInstantiateSingletons(DefaultListablebeanfactory.java:423)
at org.springframework.context.support.AbstractApplicationContext.finish
beanfactoryInitialization(AbstractApplicationContext.java:728)
at org.springframework.context.support.AbstractApplicationContext.refres
h(AbstractApplicationContext.java:380)
at org.springframework.web.context.ContextLoader.createWebApplicationCon
text(ContextLoader.java:255)
at org.springframework.web.context.ContextLoader.initWebApplicationConte
xt(ContextLoader.java:199)
at org.springframework.web.context.ContextLoaderListener.contextinitiali
zed(ContextLoaderListener.java:45)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContex
t.java:3843)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4
342)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase
.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:77
1)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.ja
va:627)
at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.j
ava:553)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:488
)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1149)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java
:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(Lifecycl
eSupport.java:117)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443
)
at org.apache.catalina.core.StandardService.start(StandardService.java:5
16)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710
)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
解决方法
你的例外(和着名的)消息是
repeated column in mapping for entity: column: SURVEY_NUM (should be mapped with insert="false" update="false")
SURVEY_NUM列在哪里？
1ºissDivision字段存储一个名为SURVEY_NUM的外键列
@ManyToOne
@JoinColumns({
@JoinColumn(name="DIVISION_CODE",updatable=false)})
private IssDivision issDivision;
现在,请看下面的映射(请参阅id和accountNumber共享相同的列)
@Entity
public class Account {
private Integer id;
private Integer accountNumber;
@Id
@Column(name="ACCOUNT_NUMBER")
public Integer getId() {
return this.id;
}
@Column(name="ACCOUNT_NUMBER")
public Integer getAccountNumber() {
return this.accountNumber;
}
}
现在我们来做如下
Account account = new Account(); account.setId(127359); account.setAccountNumber(null); entityManager.persist(account);
Hibernate会问你
Which property should i persist whether both properties shares the same column ??? And as i can see,id property stores a non-null value and accountNumber a null value.
我应该像这样执行一个查询吗？
INSERT INTO ACCOUNT (ACCOUNT_NUMBER,ACCOUNT_NUMBER) VALUES (127359,NULL);
它没有任何意义.因此,这是一个错误的SQL查询;
因为这样,你看到这个好消息
repeated column… blah,blah,blah… (should be mapped with insert=”false” update=”false”)
所以我想你的复合主键称为IsstESTPK也存储一个名为SURVEY_NUM的列.而且您将复合主键属性定义为insert =“false”update =“false”并不是个好主意.避免很多头痛.
请记住：当多个属性共享同一列时,将其中的一个定义为insertable = false,updatable = false.没有其他的.
我认为你的复合主键类应该是这样的
@Embeddable
public class IsstESTPK implements Serializable {
// Ops... Our missing field which causes our Exception (repeated column... blah,blah...)
@Column(name="SURVEY_NUM",nullable=false)
private Integer property;
private Integer otherProperty;
private Integer anotherProperty;
// required no-arg constructor
public IsstESTPK() {}
// You must implement equals and hashcode
public boolean equals(Object o) {
if(o == null)
return false;
if(!(o instanceof IsstESTPK))
return false;
IsstESTPK other = (IsstESTPK) o;
if(!(getproperty().equals(other.getproperty())))
return false;
if(!(getotherproperty().equals(other.getotherproperty())))
return false;
if(!(getAnotherproperty().equals(other.getAnotherproperty())))
return false;
return true;
}
// NetBeans or Eclipse will worry about it
public int hashcode() {
// hashcode code goes here
}
}
UPDATE
在继续之前
Hibernate does not support automatic generation of compound primary key
保存前必须提供其值.记住它
我们来看看员工复合主键
@Embeddable
public class EmployeeId implements Serializable {
@Column(name="EMPLOYEE_NUMBER")
private String employeeNumber;
@Column(name="SURVEY_NUMBER")
private BigInteger surveyNumber;
// getter's and setter's
// equals and hashcode
}
1º在保存员工之前,您必须提供其值.如上所述,Hibernate不支持复合主键的自动生成
2ºHibernate不允许您更新(复合)主键没有意义.
3º其值不能为空
所以,如上所述,我们的EmployeeId可以写成
@Embeddable
public class EmployeeId implements Serializable {
@Column(name="EMPLOYEE_NUMBER",updatable=false)
private String employeeNumber;
@Column(name="SURVEY_NUMBER",updatable=false)
private BigInteger surveyNumber;
// getter's and setter's
// equals and hashcode
}
如上所述
when more than one property shares the same column,define one of them as insertable=false,updatable=false. nothing else
但是我们不能将复合主键属性标记为insertable = false,updatable = false,因为Hibernate使用它来保存我们的实体
由于Hibernate将使用名为surveyNumber(及其SURVEY_NUMBER列)的复合主键属性来对数据库执行sql操作,因此我们需要将@ManyToOne除法属性(及其外键列名为SURVEY_NUMBER)重写为可插入= false,可更新= FALSE
// Employee.java
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumns({
@JoinColumn(name="DIVISION_CODE",referencedColumnName="DIVISION_CODE"),@JoinColumn(name="SURVEY_NUMBER",referencedColumnName="SURVEY_NUMBER",updatable=false)})
private Division division;
4º当您有复合外键时,我们无法混合可插入或不可更新 – 不可更新.
就像是
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumns({
// I can be updatable
@JoinColumn(name="DIVISION_CODE",insertable=false),// And i can be insertable
@JoinColumn(name="SURVEY_NUMBER",updatable=false)})
private Division division;
否则,Hibernate会抱怨
Mixing insertable and non insertable columns in a property is not allowed
因此,名为DIVISION_CODE的复合外键列也应标记为insertable = false,updatable = false以避免上述异常
// Employee.java
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumns({
@JoinColumn(name="DIVISION_CODE",updatable=false)})
private Division division;
由于我们无法更新DIVISION_CODE列,我们的division属性的行为就像一个常量.那么,您可以想像创建一个名为divisionCode的新属性来改变DIVISION_CODE列,如下所示
// Employee.java
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumns({
@JoinColumn(name="DIVISION_CODE",updatable=false)})
private Division division;
// Wow,Now i expect i can change the value of DIVISION_CODE column
@Column(name="DIVISION_CODE")
private BigInteger divisionCode;
好吧,我们来看看.假设我们有以下DIVISION TABLE
DIVISION TABLE DIVISION_CODE SURVEY_NUMBER 1 10 2 11 3 12 4 13 5 14
记住：Division和Employee之间有一个外键约束
你想到了
I can not change division property because of insertable=false,updatable=false. But i can change divisionCode property (and its DIVISION_CODE column) as a way to change the foreign key column called DIVISION_CODE
您执行以下代码
employee.setDivisionCode(7);
哇,见上面的DIVISION_TABLE. DIVISION_CODE列中的某些值是否等于7？
答案很清楚：否(你会看到约束违规)
所以,这是一个不一致的映射. Hibernate不允许.
问候,