休眠列類型問題（MySQL的）

這是我加盟與員工豆類：

@Entity(name="AFFILIATE") 
public class Affiliate extends HibernateBean{ 
    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    @Column(name="AFFILIATE_ID") 
    private int id; 

    @ManyToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name="EMPLOYEE_ID") 
    private Employee employee; 
     //other memebers + get and set 
} 

@Entity(name="EMPLOYEE") 
public class Employee extends HibernateBean implements ILoginAble{ 
    @Id 
    @GeneratedValue(strategy=GenerationType.IDENTITY) 
    @Column(name="EMPLOYEE_ID") 
    private int employeeId; 
     //other memebers + get and set 
}

這些都是表：

Create Table 
CREATE TABLE `AFFILIATE` (
    `AFFILIATE_ID` int(11) NOT NULL AUTO_INCREMENT, 
    `EMPLOYEE_ID` int(11) DEFAULT NULL, 
    PRIMARY KEY (`AFFILIATE_ID`), 

    KEY `fk_AFFILIATE_EMPLOYEE1` (`EMPLOYEE_ID`), 
    CONSTRAINT `fk_AFFILIATE_AFFILIATE1` FOREIGN KEY (`PARENT_ID`) REFERENCES `AFFILIATE` (`AFFILIATE_ID`) ON DELETE NO ACTION ON UPDATE NO ACTION, 
    CONSTRAINT `fk_AFFILIATE_EMPLOYEE1` FOREIGN KEY (`EMPLOYEE_ID`) REFERENCES `EMPLOYEE` (`EMPLOYEE_ID`) ON DELETE CASCADE ON UPDATE CASCADE 
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8 COLLATE=utf8_bin 

CREATE TABLE `EMPLOYEE` (
    `EMPLOYEE_ID` int(11) NOT NULL AUTO_INCREMENT, 
    PRIMARY KEY (`EMPLOYEE_ID`) 
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8 COLLATE=utf8_bin

這是全exeption：

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version). 
log4j:WARN Please initialize the log4j system properly. 
Hibernate: select this_.AFFILIATE_ID as AFFILIATE1_8_2_, this_.EMAIL as EMAIL8_2_, this_.EMPLOYEE_ID as EMPLOYEE6_8_2_, this_.name as name8_2_, this_.PARENT_ID as PARENT7_8_2_, this_.PASSWORD as PASSWORD8_2_, this_.USER_NAME as USER5_8_2_, employee2_.EMPLOYEE_ID as EMPLOYEE1_2_0_, employee2_.EMAIL as EMAIL2_0_, employee2_.FIRST_NAME as FIRST3_2_0_, employee2_.IS_ACTIVE as IS4_2_0_, employee2_.LAST_NAME as LAST5_2_0_, employee2_.PASSWORD as PASSWORD2_0_, employee2_.REG_DATE as REG7_2_0_, employee2_.USER_NAME as USER8_2_0_, affiliate3_.AFFILIATE_ID as AFFILIATE1_8_1_, affiliate3_.EMAIL as EMAIL8_1_, affiliate3_.EMPLOYEE_ID as EMPLOYEE6_8_1_, affiliate3_.name as name8_1_, affiliate3_.PARENT_ID as PARENT7_8_1_, affiliate3_.PASSWORD as PASSWORD8_1_, affiliate3_.USER_NAME as USER5_8_1_ from AFFILIATE this_ left outer join EMPLOYEE employee2_ on this_.EMPLOYEE_ID=employee2_.EMPLOYEE_ID left outer join AFFILIATE affiliate3_ on this_.PARENT_ID=affiliate3_.AFFILIATE_ID where this_.EMPLOYEE_ID=? 
Exception in thread "main" org.hibernate.PropertyAccessException: could not get a field value by reflection getter of com.affiliates.hibernate.Employee.employeeId 
    at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:58) 
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:206) 
    at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3619) 
    at org.hibernate.persister.entity.AbstractEntityPersister.isTransient(AbstractEntityPersister.java:3335) 
    at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:204) 
    at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:241) 
    at org.hibernate.type.EntityType.getIdentifier(EntityType.java:430) 
    at org.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:110) 
    at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1728) 
    at org.hibernate.loader.Loader.bindParameterValues(Loader.java:1699) 
    at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1589) 
    at org.hibernate.loader.Loader.doQuery(Loader.java:696) 
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259) 
    at org.hibernate.loader.Loader.doList(Loader.java:2228) 
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125) 
    at org.hibernate.loader.Loader.list(Loader.java:2120) 
    at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:118) 
    at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1596) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:616) 
    at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:342) 
    at $Proxy14.list(Unknown Source) 
    at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:306) 
    at com.affiliates.dao.BaseApplicationDao.getAll(BaseApplicationDao.java:43) 
    at com.affiliates.api.AffiliatesApi.getAll(AffiliatesApi.java:39) 
    at com.affiliates.api.AffiliatesAPITest.getAll(AffiliatesAPITest.java:22) 
    at com.affiliates.api.AffiliatesAPITest.main(AffiliatesAPITest.java:15) 
Caused by: java.lang.IllegalArgumentException: Can not set int field com.affiliates.hibernate.Employee.employeeId to java.lang.Integer 
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164) 
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168) 
    at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:55) 
    at sun.reflect.UnsafeIntegerFieldAccessorImpl.getInt(UnsafeIntegerFieldAccessorImpl.java:56) 
    at sun.reflect.UnsafeIntegerFieldAccessorImpl.get(UnsafeIntegerFieldAccessorImpl.java:36) 
    at java.lang.reflect.Field.get(Field.java:376) 
    at org.hibernate.property.DirectPropertyAccessor$DirectGetter.get(DirectPropertyAccessor.java:55) 

... 28 more

來源

2011-02-13 fatnjazzy

還有：「無法通過com.affiliates.hibernate.Employee.employeeId的反射getter獲取字段值」，您能否確認您的getter和setter符合javabean命名約定。儘管這也可能是由不正確的休眠映射造成的。 – 2011-02-13 09:06:22

@ Hypnos - 是的，這個convesion（你可以看到它）很好。 – fatnjazzy 2011-02-13 09:09:32

這個問題可能是這個限制：

c.add(Restrictions.eq("employee", 1));

這意味着：「要確保的僱員字段加盟實例等於1「。

但會員類的員工字段不是int也不是Integer。這是一名員工。

的限制更改爲

c.add(Restrictions.eq("employee.employeeId", 1));

我還通過對員工和子公司之間的關係級聯型驚訝。一名員工擁有許多會員，但是當您刪除某個會員時，您希望該員工被刪除。我懷疑這是有效的（你會違反約束條件）。

來源

2011-02-13 09:16:04

更改所有的原始場類型轉換爲對象類型。在你的情況下，int必須是Integer。

像：

@Id 
@GeneratedValue(strategy=GenerationType.IDENTITY) 
@Column(name="EMPLOYEE_ID") 
private Integer employeeId; 

// don't forget to change the corresponding getters and setters.

有一個愉快的一天
托馬斯

來源

2011-02-13 08:13:41

休眠列類型問題（MySQL的）

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