小型Java持久层框架 Persistence4J

persistence4j ORM简介

最新推荐文章于 2021-04-09 16:04:12 发布

最新推荐文章于 2021-04-09 16:04:12 发布 · 326 阅读

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#Java #框架 #iBATIS #MySQL #Google

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persistence4j是一个轻量级的Java ORM框架，用于实现Java对象与关系型数据库之间的映射。本文介绍如何使用persistence4j进行实体类定义、创建数据提供者，并演示了增删查改等基本操作。

简介：

persistence4j 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。要JDK1.6 以上版本

实例：

//First lets create a simple pojo which you like to persist.
@Entity(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, database);
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();
}

项目地址：http://code.google.com/p/persistence4j/