ActiveJPA基于JPA，提供了MartinFowler所提出的活动记录模式（ActiveRecordpattern）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 idOrder order = Order.findById(12345L);// Get all orders for a customer that are shippedList<Order> orders = Order.where("customer_email", "dummyemail@dummy.com", "status", "shipped");// Get all orders for the product category 'books' and paginate itFilter 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 filterLong count = Order.count(filter);// Get the first order matching the filterLong count = Order.first("customer_email", "dummyemail@dummy.com", "status", "shipped");// Get the unique order matching the conditionsLong count = Order.one("customer_email", "dummyemail@dummy.com", "status", "shipped");// Dump everythingList<Order> orders = Order.all();// Delete all orders matching the filterLong count = Order.deleteAll(filter);// Check if order exists with the given identifierboolean exists = Order.exists(1234L);// Save orderorder.setBillingAmount(1000.0);order.persist();// Delete orderorder.delete();// Update attributesMap<String, Object> attributes = new HashMap<String, Object>();attributes.put("billingAmount", 1000.0);order.updateAttributes(attributes);// Find order item by id within an orderorder.collections("order_items").findById(123L);// Search order items by filter with an orderorder.collections("order_items").findById(filter);........
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