Hibernate升级到5.2 - 创建Session Factory并替换PersistentClass以获取实体类属性 [英] Hibernate upgrade to 5.2 - Session Factory creation and replacing PersistentClass for getting entity class properties
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问题描述
我目前正在将我的Hibernate版本升级到最新版本5.2.10。我用HibernateUtil代替了SessionFactory创建的代码。
$ b
4.3.11.Final（上一个）：
public class HibernateUtil {
private HibernateUtil（）{}
$ b $ private static SessionFactory sessionFactory;
private static配置配置;
public static Configuration getConfiguration（）{
return configuration;
private static SessionFactory buildSessionFactory（）{
try {
if（sessionFactory == null）{
configuration = new Configuration（）;
configuration.configure（hibernate.cfg.xml）;
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder（）
.applySettings（configuration.getProperties（））。build（）;
sessionFactory =配置
.buildSessionFactory（serviceRegistry）;
}
return sessionFactory;
}
catch（Throwable ex）{
抛出新的ExceptionInInitializerError（ex）;
$ b public static SessionFactory getSessionFactory（）{
return buildSessionFactory（）;
public static Session getSession（）{
Session hibernateSession = getSessionFactory（）。getCurrentSession（）;
返回hibernateSession;
}
public static void shutdown（）{
getSessionFactory（）。close（）;
$ p $ 5.2 $ Final（New）：
public class HibernateUtil {
private static StandardServiceRegistry registry;
private static SessionFactory sessionFactory;
public static SessionFactory getSessionFactory（）{
return buildSessionFactory（）;
public static SessionFactory buildSessionFactory（）{
if（sessionFactory == null）{
try {
registry = new StandardServiceRegistryBuilder（）。configure （ hibernate.cfg.xml中）建立（）;
MetadataSources sources = new MetadataSources（registry）;
元数据元数据= sources.getMetadataBuilder（）。build（）;
sessionFactory = metadata.getSessionFactoryBuilder（）。build（）;
} catch（Exception e）{
e.printStackTrace（）;
shutdown（）;
}
}
return sessionFactory;
public static Session getSession（）{
Session hibernateSession = getSessionFactory（）。getCurrentSession（）;
返回hibernateSession;
public static void shutdown（）{
if（registry！= null）{
StandardServiceRegistryBuilder.destroy（registry）;
}
}
}
现在我有一种方法，将通过将数据库表名称作为字符串传递给我，以获取列名称列表。我在4.3.11之前就这样做了。最后：
public static List< String> getColumnNames（String tableName）{
List< String> columnList = NULL;
地图< String，ClassMetadata> map = HibernateUtil.getSessionFactory（）。getAllClassMetadata（）;
Iterator< Entry< String，ClassMetadata>> itr = map.entrySet（）。iterator（）;
while（itr.hasNext（））{
ClassMetadata classMetaData = itr.next（）。getValue（）;
AbstractEntityPersister aep =（AbstractEntityPersister）classMetaData;
if（aep.getTableName（）。split（\\\。）[1] .equalsIgnoreCase（tableName））{
columnList = new ArrayList< String> ;（）;
String [] propertyNames = classMetaData.getPropertyNames（）;
for（String property：propertyNames）{
try {
PersistentClass persistentClass = HibernateUtil .getConfiguration（）。getClassMapping（classMetaData.getEntityName（））;
String clmName =（（Column）persistentClass.getProperty（property）.getColumnIterator（）。next（））。getName（）;
columnList.add（clmName）;
} catch（NoSuchElementException e）{
log.error（元素未找到标识为：+属性）;
} catch（Exception e）{
log.error（e.getMessage（））;
}
}
break;
}
}
return columnList;
}
现在升级后，它显示getAllClassMetadata方法已过时，获取PersistentClass对象。我看到一个类似的问题这里，但我无法准确找出解决方案。我必须改变我当前代码的哪一部分，才能使getColumnNames（）方法与之前完全一样。我引用了文档，它说要使用 EntityManagerFactory.getMetamodel（）代替，但是我找不到相同的参考示例。我还需要为此更改SessionFactory创建机制吗？
最后，我对Vlad的文章感谢了。我没有任何改变就采集了集成商代码，并修改了我的 HibernateUtil 和 getColumns（）方法。所以这是我的代码：
创建SessionFactory ：
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory（）;
public static SessionFactory getSessionFactory（）{
return buildSessionFactory（）;
$ b $ private static SessionFactory buildSessionFactory（）{
final BootstrapServiceRegistry bootstrapServiceRegistry = new BootstrapServiceRegistryBuilder（）。enableAutoClose（）
.applyIntegrator（MetadataExtractorIntegrator.INSTANCE）.build（） ）;
final StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder（bootstrapServiceRegistry）.configure（）。build（）;
返回新的MetadataSources（serviceRegistry）.buildMetadata（）。buildSessionFactory（）;
public static Session getSession（）{
Session hibernateSession = getSessionFactory（）。getCurrentSession（）;
返回hibernateSession;
}
public static void shutdown（）{
getSessionFactory（）。close（）;
code $元元数据提取器（获取列名称）：
public static List< String> getColumnNames（String tableName）{
List< String> columnList = new ArrayList<>（）; （Table table：namespace.getTables（））{
if（table。
for（Namespace namespace：MetadataExtractorIntegrator.INSTANCE.getDatabase（）。getNamespaces（）） getName（）。equalsIgnoreCase（lookupTableName））{
Iterator< Column> iterator = table.getColumnIterator（）;
while（iterator.hasNext（））{
columnList.add（iterator.next（）。getName（））;
}
break;
}
}
if（！columnList.isEmpty（））
break;
}
return columnList;
}
I am currently upgrading my Hibernate version to the latest version 5.2.10. I replaced my code in the HibernateUtil for the SessionFactory creation.
4.3.11.Final (Previous):
public class HibernateUtil {
private HibernateUtil() {}
private static SessionFactory sessionFactory;
private static Configuration configuration;
public static Configuration getConfiguration() {
return configuration;
}
private static SessionFactory buildSessionFactory() {
try {
if(sessionFactory == null) {
configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
.applySettings(configuration.getProperties()).build();
sessionFactory = configuration
.buildSessionFactory(serviceRegistry);
}
return sessionFactory;
}
catch (Throwable ex) {
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return buildSessionFactory();
}
public static Session getSession() {
Session hibernateSession = getSessionFactory().getCurrentSession();
return hibernateSession;
}
public static void shutdown() {
getSessionFactory().close();
}
}
5.2.10 Final (New):
public class HibernateUtil {
private static StandardServiceRegistry registry;
private static SessionFactory sessionFactory;
public static SessionFactory getSessionFactory() {
return buildSessionFactory();
}
public static SessionFactory buildSessionFactory() {
if (sessionFactory == null) {
try {
registry = new StandardServiceRegistryBuilder().configure("hibernate.cfg.xml").build();
MetadataSources sources = new MetadataSources(registry);
Metadata metadata = sources.getMetadataBuilder().build();
sessionFactory = metadata.getSessionFactoryBuilder().build();
} catch (Exception e) {
e.printStackTrace();
shutdown();
}
}
return sessionFactory;
}
public static Session getSession() {
Session hibernateSession = getSessionFactory().getCurrentSession();
return hibernateSession;
}
public static void shutdown() {
if (registry != null) {
StandardServiceRegistryBuilder.destroy(registry);
}
}
}
Now I have a method which would fetch me the list of column names by passing the DB table name as a string. I did it like this before in 4.3.11.Final:
public static List<String> getColumnNames(String tableName) {
List<String> columnList=null;
Map<String, ClassMetadata> map = HibernateUtil.getSessionFactory().getAllClassMetadata();
Iterator<Entry<String, ClassMetadata>> itr = map.entrySet().iterator();
while(itr.hasNext()){
ClassMetadata classMetaData = itr.next().getValue();
AbstractEntityPersister aep = (AbstractEntityPersister) classMetaData;
if(aep.getTableName().split("\\.")[1].equalsIgnoreCase(tableName)){
columnList = new ArrayList<String>();
String[] propertyNames = classMetaData.getPropertyNames();
for(String property : propertyNames){
try {
PersistentClass persistentClass = HibernateUtil .getConfiguration().getClassMapping(classMetaData.getEntityName());
String clmName = ((Column) persistentClass.getProperty(property).getColumnIterator().next()).getName();
columnList.add(clmName);
} catch(NoSuchElementException e){
log.error("Element not found idenfied as : "+property);
} catch(Exception e){
log.error(e.getMessage());
}
}
break;
}
}
return columnList;
}
Now after the upgrade it shows the method getAllClassMetadata as deprecated and am facing difficulty to get the PersistentClass object. I saw a similar question here but I couldn't exactly figure out the solution. What part of my current code do I have to change for my getColumnNames() method to work exactly like before. I referred the documentation and it says to use the EntityManagerFactory.getMetamodel() instead but i can't find suitable reference examples of the same. Also will I have to change the SessionFactory creation mechanism for this?
解决方案 Well finally I did it thank's to Vlad's article. I took the integrator code without any change and modified my HibernateUtil and the getColumns() method. So here's my code:
SessionFactory creation:
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
public static SessionFactory getSessionFactory() {
return buildSessionFactory();
}
private static SessionFactory buildSessionFactory() {
final BootstrapServiceRegistry bootstrapServiceRegistry = new BootstrapServiceRegistryBuilder().enableAutoClose()
.applyIntegrator(MetadataExtractorIntegrator.INSTANCE).build();
final StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder(bootstrapServiceRegistry).configure().build();
return new MetadataSources(serviceRegistry).buildMetadata().buildSessionFactory();
}
public static Session getSession() {
Session hibernateSession = getSessionFactory().getCurrentSession();
return hibernateSession;
}
public static void shutdown() {
getSessionFactory().close();
}
}
Metadata Extractor(Get Column names):
public static List<String> getColumnNames(String tableName) {
List<String> columnList = new ArrayList<>();
for (Namespace namespace : MetadataExtractorIntegrator.INSTANCE.getDatabase().getNamespaces()) {
for (Table table : namespace.getTables()) {
if (table.getName().equalsIgnoreCase(lookupTableName)) {
Iterator<Column> iterator = table.getColumnIterator();
while (iterator.hasNext()) {
columnList.add(iterator.next().getName());
}
break;
}
}
if (!columnList.isEmpty())
break;
}
return columnList;
}
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