爪哇 Map<String, String> properties = new HashMap<>();
properties.put("provider", "org.hibernate.ejb.HibernatePersistence");
properties.put("hibernate.show_sql", "true");
properties.put("hibernate.format_sql", "true");
properties.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
properties.put("hibernate.connection.driver_class", "com.mysql.jdbc.Driver");
properties.put("hibernate.connection.username", "username");
properties.put("hibernate.connection.password", "password");
properties.put("hibernate.connection.url", "jdbc:mysql://<hostname>:3306/<schema>");
Persistence.createEntityManagerFactory("localDB", properties);搖籃依賴compile group: 'org.hibernate', name: 'hibernate-core', version: '5.4.3.Final'當(dāng)我運(yùn)行它時，我得到Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named localDB我想在沒有 Spring 和 persistence.xml/hibernate.cfg.xml 的情況下進(jìn)行。我對注釋配置很滿意。我不知道如何在帶有 @Entity 注釋（沒有 XML）的類所在的屬性中聲明。我在哪里可以找到?jīng)]有 XML 或其他框架（Spring）的 JPA（Hibernate 或任何其他實(shí)現(xiàn)）的最小工作示例？
1 回答
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TA貢獻(xiàn)1815條經(jīng)驗(yàn) 獲得超10個贊
如果您只添加一個META-INF/persistence.xml. 但是，如果您堅持不這樣做，則persistence.xml必須自己實(shí)施PersistenceUnitInfo，這與僅添加一個persistence.xml. 可以在此處找到一個最小的實(shí)現(xiàn)：
public class PersistenceUnitInfoImpl implements PersistenceUnitInfo {
public static final String JPA_VERSION = "2.1";
private final String persistenceUnitName;
private PersistenceUnitTransactionType transactionType = PersistenceUnitTransactionType.RESOURCE_LOCAL;
private final List<String> managedClassNames;
private final List<String> mappingFileNames = new ArrayList<>();
private final Properties properties;
private DataSource jtaDataSource;
private DataSource nonJtaDataSource;
public PersistenceUnitInfoImpl(
String persistenceUnitName,
List<String> managedClassNames,
Properties properties) {
this.persistenceUnitName = persistenceUnitName;
this.managedClassNames = managedClassNames;
this.properties = properties;
}
@Override
public String getPersistenceUnitName() {
return persistenceUnitName;
}
@Override
public String getPersistenceProviderClassName() {
return HibernatePersistenceProvider.class.getName();
}
@Override
public PersistenceUnitTransactionType getTransactionType() {
return transactionType;
}
@Override
public DataSource getJtaDataSource() {
return jtaDataSource;
}
public PersistenceUnitInfoImpl setJtaDataSource(
DataSource jtaDataSource) {
this.jtaDataSource = jtaDataSource;
this.nonJtaDataSource = null;
transactionType = PersistenceUnitTransactionType.JTA;
return this;
}
@Override
public DataSource getNonJtaDataSource() {
return nonJtaDataSource;
}
public PersistenceUnitInfoImpl setNonJtaDataSource(
DataSource nonJtaDataSource) {
this.nonJtaDataSource = nonJtaDataSource;
this.jtaDataSource = null;
transactionType = PersistenceUnitTransactionType.RESOURCE_LOCAL;
return this;
}
@Override
public List<String> getMappingFileNames() {
return mappingFileNames;
}
@Override
public List<URL> getJarFileUrls() {
return Collections.emptyList();
}
@Override
public URL getPersistenceUnitRootUrl() {
return null;
}
@Override
public List<String> getManagedClassNames() {
return managedClassNames;
}
@Override
public boolean excludeUnlistedClasses() {
return false;
}
@Override
public SharedCacheMode getSharedCacheMode() {
return SharedCacheMode.UNSPECIFIED;
}
@Override
public ValidationMode getValidationMode() {
return ValidationMode.AUTO;
}
public Properties getProperties() {
return properties;
}
@Override
public String getPersistenceXMLSchemaVersion() {
return JPA_VERSION;
}
@Override
public ClassLoader getClassLoader() {
return Thread.currentThread().getContextClassLoader();
}
@Override
public void addTransformer(ClassTransformer transformer) {
}
@Override
public ClassLoader getNewTempClassLoader() {
return null;
}
}
然后用它來引導(dǎo)EntityManagerFactory/ EntityManager：
Properties properties = new Properties();
properties.put("hibernate.show_sql", "true");
properties.put("hibernate.format_sql", "true");
properties.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
properties.put("hibernate.connection.driver_class", "com.mysql.jdbc.Driver");
properties.put("hibernate.connection.username", "username");
properties.put("hibernate.connection.password", "password");
properties.put("hibernate.connection.url", "jdbc:mysql://<hostname>:3306/<schema>");
List<String> entitesClass = new ArrayList<>();
entitesClass.add("com.company.entities.Foo");
entitesClass.add("com.company.entities.Bar");
PersistenceUnitInfoImpl punit = new PersistenceUnitInfoImpl("localDB", entitesClass , properties);
PersistenceProvider provider = new HibernatePersistenceProvider();
EntityManagerFactory emf= provider.createContainerEntityManagerFactory(punit, null);
EntityManager em = emf.createEntityManager();
//blablblabl
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