EntityManagerManager (Tapestry API - 5.7.2)乐学网一站式学习平台

All Known Implementing Classes:

EntityManagerManagerImpl
```
public interface EntityManagerManager
```
Manages EntityManagers for the current thread. An EntityManager is created as needed and closed at the end of each request. The implementation of this service is per-thread.

Since:

5.3

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`EntityManager`	`getEntityManager(String persistenceUnitName)`	Gets the active EntityManager for this request, creating it as necessary.
`Map<String,EntityManager>`	`getEntityManagers()`	Gets all active EntityManagers for this request, creating them as necessary.

- Method Detail
  - getEntityManager
```
EntityManager getEntityManager(String persistenceUnitName)
```
    Gets the active EntityManager for this request, creating it as necessary.
    
    Parameters:
    
    persistenceUnitName - the name of a persistence unit as defined in persistence.xml
    
    Returns:
    
    EntityManager for the persistence unit,
  - getEntityManagers
```
Map<String,EntityManager> getEntityManagers()
```
    Gets all active EntityManagers for this request, creating them as necessary.
    
    Returns:
    
    Map in which persistence unit names are associated with EntityManagers