Persistence4j 1.1发布，Java ORM框架

近日，Persistence4j 1.1版本发布了，它是一个小型、轻量级的Java 对象持久层类库，实现关系数据库和Java 对象之间的持久化。此版本主要是对bug的修复，点击查看更新详情：http://code.google.com/p/persistence4j/

Persistence4j的目标就是开发一款操作简单使用方便的Java ORM框架,秉承这一设计理念设计出的Persistence4j拥有及其简单的配置，其语法基于JDK 1.6中的注释，使用起来十分方便。

实例代码：

//First lets create a simple pojo which you like to persist.
@Entity(schema="library",table="book")
public class Book{
@Column(isPrimaryKey=true)
private String isbn;
@Column
private String title;
@Column
private int authorid;
public Book(){

}
public Book(String isbn, String title, int authorid){
  this.isbn = isbn;
  this.title = title;
  this.authorid = authorid;
}
// getters
}

DataProviderFactory dataProviderFactory = new DataProviderFactoryImpl(config);
String databaseName = "library";
String dbmsName = "mysql"
boolean isTransactional = false;
DataProvider dataProvider =  dataProviderFactory.getDataProvider(databaseName, dbmsName, isTransactional);

// Now lets create a object of Book class and persist it
Book book = new Book("123432","TestBook",5);
TransferUtil.registerClass(Book.class);
GenericDAO<Book> genericDAO = new GenericDaoImpl<Book>(dataProvider.getDataFetcher());

//Persist Book
genericDAO.createEntity(book);

//Remove Book
genericDAO.deleteEntity(book);

//Test if Entity Exists
genericDAO.isEntityExists(book);

// findByPrimaryKey
Object obj[] = new Object[1];
obj[0] = "123432";
genericDAO.findByPrimaryKey(Book.class, obj);

//If you want to use transactions.This how to get TransactionService.Make sure //isTransactional variable should be true and underlying dbms supports ACID.
TransactionService ts = dataProvider.getTransactionService();
try{
    ts.beginTransaction();
    genericDAO.createEntity(book);
    ts.commitTransaction();
}catch(Exception exp){
ts.rollbackTransaction();
}

// Check the GenericDAO interface for all the available methods..
You can extend GenericDAOImpl and override the methods and add your own methods.

原文链接：http://www.javaeye.com/news/17626