针对JPA的活动记录模式:ActiveJPA

jopen 9年前

ActiveJPA基于JPA,提供了Martin Fowler所提出的活动记录模式(Active Record pattern)的Java实现。借助于ActiveJPA,模型本身会作为DAO并与数据库交互,这样就不需要额外的代码作为数据访问层了。

ActiveJPA使用到了JPA规范,因此所有JPA的ORM实现(Hibernate、EclipseLink、OpenJPA等)都可以与ActiveJPA协同使用。

示例代码:

// Get order by id  Order order = Order.findById(12345L);    // Get all orders for a customer that are shipped  List<Order> orders = Order.where("customer_email", "dummyemail@dummy.com", "status", "shipped");    // Get all orders for the product category 'books' and paginate it  Filter filter = new Filter();  filter.setPageNo(1);  filter.setPerPage(25);  filter.addCondition(new Condition("orderItems.product.category", Operator.eq, "books");  List<Order> orders = Order.where(filter);    // Count of orders matching the filter  Long count = Order.count(filter);    // Get the first order matching the filter  Long count = Order.first("customer_email", "dummyemail@dummy.com", "status", "shipped");    // Get the unique order matching the conditions  Long count = Order.one("customer_email", "dummyemail@dummy.com", "status", "shipped");    // Dump everything  List<Order> orders = Order.all();    // Delete all orders matching the filter  Long count = Order.deleteAll(filter);    // Check if order exists with the given identifier  boolean exists = Order.exists(1234L);    // Save order  order.setBillingAmount(1000.0);  order.persist();    // Delete order  order.delete();    // Update attributes  Map<String, Object> attributes = new HashMap<String, Object>();  attributes.put("billingAmount", 1000.0);  order.updateAttributes(attributes);    // Find order item by id within an order  order.collections("order_items").findById(123L);    // Search order items by filter with an order  order.collections("order_items").findById(filter);    ....  ....

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