先看看效果图：

1.sql

①t_orderitem一个外键

bname:方便后期book删除

CREATE TABLE `t_orderitem` ( `orderItemId` char(32) NOT NULL, `quantity` int(11) DEFAULT NULL, `subtotal` decimal(8,2) DEFAULT NULL, `bid` char(32) DEFAULT NULL, `bname` varchar(200) DEFAULT NULL, `currPrice` decimal(8,2) DEFAULT NULL, `image_b` varchar(100) DEFAULT NULL, `oid` char(32) DEFAULT NULL, PRIMARY KEY (`orderItemId`), KEY `FK_t_orderitem_t_order` (`oid`), CONSTRAINT `FK_t_orderitem_t_order` FOREIGN KEY (`oid`) REFERENCES `t_order` (`oid`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; insert into `t_orderitem`(`orderItemId`,`quantity`,`subtotal`,`bid`,`bname`,`currPrice`,`image_b`,`oid`) values ('01D2DF3E5BB34E9F9D2477180C8D94D3',1,'74.50','CE01F15D435A4C51B0AD8202A318DCA7','Java编程思想（第4版）','74.50','book_img/9317290-1_b.jpg','C0841F4DFE7A43BFB183E4E82AE7914C');

②t_order一个外键

CREATE TABLE `t_order` ( `oid` char(32) NOT NULL, `ordertime` char(19) DEFAULT NULL, `total` decimal(10,2) DEFAULT NULL, `status` int(11) DEFAULT NULL, `address` varchar(1000) DEFAULT NULL, `uid` char(32) DEFAULT NULL, PRIMARY KEY (`oid`), KEY `FK_t_order_t_user` (`uid`), CONSTRAINT `FK_t_order_t_user` FOREIGN KEY (`uid`) REFERENCES `t_user` (`uid`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; insert into `t_order`(`oid`,`ordertime`,`total`,`status`,`address`,`uid`) values ('058F48DA33694C6D8F5C2C13F3D26CEA','2013-12-26 21:47:04','95.30',1,'李女士 广东省 揭阳市 揭东县 xxx xxx xxx','32DB3700D2564254982BC58B0E4D95BC');

2.bean

①OrderItem

public class OrderItem { private String orderItemId;//主键 private int quantity;//数量 private double subtotal;//小计 private Book book;//所关联的Book private Order order;//所属的订单

②Order

public class Order { private String oid;//主键 private String ordertime;//下单时间 private double total;//总计 private int status; //订单状态：1未付款, 2已付款但未发货, 3已发货未确认收货, 4确认收货了交易成功, 5已取消(只有未付款才能取消) private String address;//收货地址 private User owner;//订单的所有者 private List<OrderItem> orderItemList;

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