我如何告诉EclipseLink停止ServerSession连接查询

Question

当查看我的堆栈跟踪日志时，我注意到每当我使用实体管理器或EL（JPA 2.0）提供的方法em.find(), findAll() ...运行任何查询时，所有相关的对象都会注入一个bean实体根据关系触发n queries 。 我已经使用spring.instruments jar成功地启用了与tomcat的编织，并且我非常确定正在发生编织，并且我的@ OneToOne，@ ManyToOne惰性设置已得到及时设置和编织。 问题可能是我如何查询以及执行多个查询的ServerSession连接。

堆栈跟踪显示如下：

[EL Fine]: sql: 2012-07-04 22:26:20.959--ServerSession(1528617164)--Connection(1657707912)--Thread(Thread[tomcat-http--9,5,main])--SELECT personID, TYPE, DATEADDED, FIRSTNAME, LASTNAME, MIDDLENAME, ACTIVE, BIRTHDAY, EMAILADDRESS, ETHNICITY, GENDER, HISPANIC, IMAGEPATH, MARITAL, NATIVELANGUAGE, PRIMARYTELEPHONE, RELIGIOUSAFFILIATION, SECONDARYTELEPHONE, version, addressID, schoolID, MAJOR, studentId FROM PERSON WHERE (personID = ?)
    bind => [101]
2012-07-04 22:26:20,963 [tomcat-http--9] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'org.bixin.dugsi.domain.Administrator': PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.Person.entityManager
2012-07-04 22:26:20,964 [tomcat-http--9] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'entityManagerFactory'
2012-07-04 22:26:20,964 [tomcat-http--9] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'org.bixin.dugsi.domain.Administrator': PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.Person.entityManager
2012-07-04 22:26:20,965 [tomcat-http--9] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'entityManagerFactory'
[EL Fine]: sql: 2012-07-04 22:26:20.966--ServerSession(1528617164)--Connection(264950364)--Thread(Thread[tomcat-http--9,5,main])--SELECT addressID, CITY, COUNTRY, STATE_US, STREETADDRESS, STREETADDRESS2, version, ZIPCODE FROM ADDRESS WHERE (addressID = ?)
    bind => [3]
2012-07-04 22:26:20,970 [tomcat-http--9] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'org.bixin.dugsi.domain.Address': PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.Address.entityManager
2012-07-04 22:26:20,971 [tomcat-http--9] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'entityManagerFactory'
[EL Fine]: sql: 2012-07-04 22:26:20.972--ServerSession(1528617164)--Connection(255059556)--Thread(Thread[tomcat-http--9,5,main])--SELECT personID, TYPE, DATEADDED, FIRSTNAME, LASTNAME, MIDDLENAME, ACTIVE, BIRTHDAY, EMAILADDRESS, ETHNICITY, GENDER, HISPANIC, IMAGEPATH, MARITAL, NATIVELANGUAGE, PRIMARYTELEPHONE, RELIGIOUSAFFILIATION, SECONDARYTELEPHONE, version, addressID, schoolID, MAJOR, studentId FROM PERSON WHERE (addressID = ?)
    bind => [3]
2012-07-04 22:26:20,975 [tomcat-http--9] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'org.bixin.dugsi.domain.Student': PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.Person.entityManager
2012-07-04 22:26:20,976 [tomcat-http--9] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'entityManagerFactory'
2012-07-04 22:26:20,976 [tomcat-http--9] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'org.bixin.dugsi.domain.Student': PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.Person.entityManager
2012-07-04 22:26:20,977 [tomcat-http--9] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'entityManagerFactory'
[EL Fine]: sql: 2012-07-04 22:26:20.98--ServerSession(1528617164)--Connection(2062869828)--Thread(Thread[tomcat-http--9,5,main])--SELECT schoolID, ACTIVE, ADMISSIONSEMAILADDRESS, ADMISSIONSPHONE, CODE, description, HELPGENERALEMAILADDRESS, NAME, PRIMARYPHONE, version, addressID FROM SCHOOL WHERE (schoolID = ?)
    bind => [3]
2012-07-04 22:26:20,982 [tomcat-http--9] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'org.bixin.dugsi.domain.School': PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.School.entityManager
2012-07-04 22:26:20,982 [tomcat-http--9] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'entityManagerFactory'
[EL Fine]: sql: 2012-07-04 22:26:20.983--ServerSession(1528617164)--Connection(140234280)--Thread(Thread[tomcat-http--9,5,main])--SELECT id, ACTIVE, CODE, DESCRIPTION, NAME, version, SCHOOLDEPARTMENT_schoolID FROM DEPARTMENT WHERE (SCHOOLDEPARTMENT_schoolID = ?)
    bind => [3]
[EL Fine]: sql: 2012-07-04 22:26:20.986--ServerSession(1528617164)--Connection(1812702959)--Thread(Thread[tomcat-http--9,5,main])--SELECT personID, TYPE, DATEADDED, FIRSTNAME, LASTNAME, MIDDLENAME, ACTIVE, BIRTHDAY, EMAILADDRESS, ETHNICITY, GENDER, HISPANIC, IMAGEPATH, MARITAL, NATIVELANGUAGE, PRIMARYTELEPHONE, RELIGIOUSAFFILIATION, SECONDARYTELEPHONE, version, addressID, schoolID, MAJOR, studentId FROM PERSON WHERE (schoolID = ?)
    bind => [3]

在实体管理器对象上执行查询后，如何忽略缓存并立即返回？

@RooJavaBean
@RooToString
@RooJpaActiveRecord(identifierColumn = "addressID")
public class Address {


    @Id
    @TableGenerator(name = "ADDRESS_TABLE_GEN", table = "ADDRESS_SEQUENCE_TABLE", pkColumnName = "SEQ_NAME", valueColumnName = "SEQ_COUNT", pkColumnValue = "ADDR_SEQ", allocationSize = 1, initialValue = 1)
    @GeneratedValue(strategy = GenerationType.TABLE, generator = "ADDRESS_TABLE_GEN")
    @Column(name = "addressID")
    private Long id;

    @BatchFetch(BatchFetchType.JOIN)
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "address", fetch = FetchType.EAGER)
    private Set<Person> persons = new HashSet<Person>();

申请人实体

public class Applicant extends Person {

    private String major;

    @BatchFetch(BatchFetchType.JOIN)
    @OneToMany(targetEntity = ApplicantSchool.class, cascade = { javax.persistence.CascadeType.PERSIST, javax.persistence.CascadeType.REMOVE }, mappedBy = "applicant", fetch = FetchType.EAGER)
    private Set<ApplicantSchool> schools = new HashSet<ApplicantSchool>();

}

堆栈跟踪; 还原特定的OneToOne映射

[TomcatInstrumentableClassLoader@747917a] error aspect 'org.springframework.orm.jpa.aspectj.JpaExceptionTranslatorAspect' woven into 'org.bixin.dugsi.domain.Registration_Roo_Jpa_ActiveRecord' must be defined to the weaver (placed on the aspectpath, or defined in an aop.xml file if using LTW).
[TomcatInstrumentableClassLoader@747917a] error aspect 'org.springframework.mock.staticmock.AnnotationDrivenStaticEntityMockingControl' woven into 'org.bixin.dugsi.domain.Registration_Roo_Jpa_ActiveRecord' must be defined to the weaver (placed on the aspectpath, or defined in an aop.xml file if using LTW).
2012-07-06 17:08:34,910 ["http-bio-8080"-exec-1] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Found injected element on class [org.bixin.dugsi.domain.Registration]: PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.Registration.entityManager
2012-07-06 17:08:34,910 ["http-bio-8080"-exec-1] DEBUG org.springframework.beans.factory.annotation.InjectionMetadata - Processing injected method of bean 'org.bixin.dugsi.domain.Registration': PersistenceElement for transient javax.persistence.EntityManager org.bixin.dugsi.domain.Registration.entityManager
2012-07-06 17:08:34,911 ["http-bio-8080"-exec-1] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'entityManagerFactory'
2012-07-06 17:08:34,914 ["http-bio-8080"-exec-1] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor#0'
[EL Warning]: metadata: 2012-07-06 17:08:34.968--ServerSession(1433743869)--Thread(Thread["http-bio-8080"-exec-1,5,main])--Reverting the lazy setting on the OneToOne or ManyToOne attribute [person] for the entity class [class org.bixin.dugsi.domain.UserAccount] since weaving was not enabled or did not occur.

这就是EL所指的领域

   @OneToOne(targetEntity = Person.class, fetch = FetchType.LAZY) 
    @JoinColumn
    private Person person;

Answer 1

您已经在显示的两个关系中都指定了FetchType.EAGER，因此在构建源对象时必须始终提取它们。 如前所述，问题似乎是在“人”（或申请人）中读取，从而导致获取地址。 可能是“亲自”的“地址” ManyToOne也被标记为渴望。 这将导致构建地址，并且由于您从Address-> Applicant获得了1：M，因此该查询必须转到数据库以确保它获取了所有申请人。

在所有引用的急切获取的实体上都发生同样的现象，这就是为什么除非有必要（尤其是OneToMany和ManyToMany关系），否则将所有事物标记为急切的想法是一个坏主意。 我建议您将它们更改为惰性，并且仅在访问该关系时才根据需要获取它们，或者在查询或查询提示中使用访存联接来预取将需要的特定关系。