问题描述
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我正在我的项目的开始。因此，我正在尝试设计一种避免Hibernate LazyInitializationExceptions的体系结构。到目前为止，我的applicationContext.xml具有：
<bean id=\"sessionFactory\" class=\"org.springframework.orm.hibernate3.LocalSessionfactorybean\">
<property name=\"dataSource\" ref=\"dataSource\"/>
<property name=\"configLocation\">
<value>/WEB-INF/hibernate.cfg.xml</value>
</property>
<property name=\"configurationClass\">
<value>org.hibernate.cfg.AnnotationConfiguration</value>
</property>
<property name=\"hibernateProperties\">
<props>
<prop key=\"hibernate.dialect\">${hibernate.dialect}</prop>
<prop key=\"hibernate.show_sql\">${hibernate.show_sql}</prop>
</props>
</property>
<property name=\"eventListeners\">
<map>
<entry key=\"merge\">
<bean class=\"org.springframework.orm.hibernate3.support.IdTransferringMergeEventListener\"/>
</entry>
</map>
</property>
</bean>
<bean id=\"dao\" class=\"info.ems.hibernate.HibernateEMSDao\" init-method=\"createSchema\">
<property name=\"hibernateTemplate\">
<bean class=\"org.springframework.orm.hibernate3.HibernateTemplate\">
<property name=\"sessionFactory\" ref=\"sessionFactory\"/>
<property name=\"flushMode\">
<bean id=\"org.springframework.orm.hibernate3.HibernateAccessor.FLUSH_COMMIT\" class=\"org.springframework.beans.factory.config.FieldRetrievingfactorybean\"/>
</property>
</bean>
</property>
<property name=\"schemaHelper\">
<bean class=\"info.ems.hibernate.SchemaHelper\">
<property name=\"driverClassName\" value=\"${database.driver}\"/>
<property name=\"url\" value=\"${database.url}\"/>
<property name=\"username\" value=\"${database.username}\"/>
<property name=\"password\" value=\"${database.password}\"/>
<property name=\"hibernateDialect\" value=\"${hibernate.dialect}\"/>
<property name=\"dataSourceJndiName\" value=\"${database.datasource.jndiname}\"/>
</bean>
</property>
</bean>
<hibernate-configuration>
<session-factory>
<mapping class=\"info.ems.models.User\" />
<mapping class=\"info.ems.models.Role\" />
</session-factory>
</hibernate-configuration>
@Entity
@Table(name=\"ROLE\")
@Access(Accesstype.FIELD)
public class Role implements Serializable {
private static final long serialVersionUID = 3L;
@Id
@Column(name=\"ROLE_ID\",updatable=false,nullable=false)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
@Column(name=\"USERNAME\")
private String username;
@Column(name=\"ROLE\")
private String role;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
}
@Entity
@Table(name = \"USER\")
@Access(Accesstype.FIELD)
public class User implements UserDetails,Serializable {
private static final long serialVersionUID = 2L;
@Id
@Column(name = \"USER_ID\",nullable=false)
@GeneratedValue(strategy = GenerationType.IDENTITY)
private long id;
@Column(name = \"USERNAME\")
private String username;
@Column(name = \"PASSWORD\")
private String password;
@Column(name = \"NAME\")
private String name;
@Column(name = \"EMAIL\")
private String email;
@Column(name = \"LOCKED\")
private boolean locked;
@OnetoMany(cascade = CascadeType.ALL,fetch = FetchType.EAGER,targetEntity = Role.class)
@JoinTable(name = \"USER_ROLE\",joinColumns = { @JoinColumn(name = \"USER_ID\") },inverseJoinColumns = { @JoinColumn(name = \"ROLE_ID\") })
private Set<Role> roles;
@Override
public GrantedAuthority[] getAuthorities() {
List<GrantedAuthorityImpl> list = new ArrayList<GrantedAuthorityImpl>(0);
for (Role role : roles) {
list.add(new GrantedAuthorityImpl(role.getRole()));
}
return (GrantedAuthority[]) list.toArray(new GrantedAuthority[list.size()]);
}
@Override
public boolean isAccountNonExpired() {
return true;
}
@Override
public boolean isAccountNonLocked() {
return !isLocked();
}
@Override
public boolean isCredentialsNonExpired() {
return true;
}
@Override
public boolean isEnabled() {
return true;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Override
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String getpassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public boolean isLocked() {
return locked;
}
public void setLocked(boolean locked) {
this.locked = locked;
}
public Set<Role> getRoles() {
return roles;
}
public void setRoles(Set<Role> roles) {
this.roles = roles;
}
}
public void saveUser(final User user) {
getHibernateTemplate().execute(new HibernateCallback() {
@Override
public Object doInHibernate(Session session) throws HibernateException,sqlException {
session.flush();
session.setCacheMode(CacheMode.IGnorE);
session.save(user);
session.flush();
return null;
}
});
}
public User getUser(final Long id) {
return (User) getHibernateTemplate().execute(new HibernateCallback() {
@Override
public Object doInHibernate(Session session) throws HibernateException,sqlException {
return session.get(User.class,id);
}
});
}
public User getUser(final Long id) {
getHibernateTemplate().load(User.class,id);
}
public void saveUser(final User user) {
Session session = getSession();
Transaction transaction = session.beginTransaction();
session.save(user);
transaction.commit();
session.close();
}
public User getUser(final Long id) {
Session session = getSession();
session.enableFetchProfile(\"USER-ROLE-PROFILE\");
User user = (User) session.get(User.class,id);
session.disableFetchProfile(\"USER-ROLE-PROFILE\");
session.close();
return user;
}
解决方法
saveUser
load
get
load
upadate
saveOrUpdate
merge
merge
extended persistence context