JPAAuthorDAO (Student Root 5.1.0-SNAPSHOT API)

java.lang.Object
- ejava.examples.daoex.jpa.JPAAuthorDAO

All Implemented Interfaces:

AuthorDAO
```
public class JPAAuthorDAO
extends Object
implements AuthorDAO
```
This class implements a DAO using javax.persistence.EntityManager. Most of the work of mapping the objects to the database is being performed in either the @Entity class or in a orm.xml descriptor file. The caller of this object must manage the transaction scope. The EntityManager is being injected into the DAO at the start of the overall transaction.

Field Summary

Fields
Modifier and Type Field Description

private EntityManager em

private static org.slf4j.Logger logger

Constructor Summary

Constructors
Constructor Description

JPAAuthorDAO()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`create(Author author)`
`Author`	`get(long id)`
`Author`	`getByQuery(long id)`
`void`	`remove(Author author)`
`void`	`setEntityManager(EntityManager em)`
`Author`	`update(Author author)`
`Author`	`updateByMerge(Author author)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

logger

private static final org.slf4j.Logger logger

em
```
private EntityManager em
```

Constructor Detail
- JPAAuthorDAO
```
public JPAAuthorDAO()
```

Method Detail

setEntityManager

public void setEntityManager(EntityManager em)

create
```
public void create(Author author)
```
Specified by:

create in interface AuthorDAO

get
```
public Author get(long id)
```
Specified by:

get in interface AuthorDAO

getByQuery
```
public Author getByQuery(long id)
```
Specified by:

getByQuery in interface AuthorDAO

update

public Author update(Author author)
              throws DAOException

Specified by:: update in interface AuthorDAO
Throws:: DAOException

updateByMerge
```
public Author updateByMerge(Author author)
```
Specified by:

updateByMerge in interface AuthorDAO

remove
```
public void remove(Author author)
```
Specified by:

remove in interface AuthorDAO