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Java模式设计之数据访问对象模式 - 编程入门网

作者 佚名技术 来源 NET编程 浏览 发布时间 2012-06-23
thus shielded from knowing // these implementation details. import java.sql.*; public class CloudscapeCustomerDAO implements CustomerDAO {   public CloudscapeCustomerDAO() {    // initialization   }   // The following methods can use   // CloudscapeDAOFactory.createConnection()   // to get a connection as required   public int insertCustomer(...) {    // Implement insert customer here.    // Return newly created customer number    // or a -1 on error   }   public boolean deleteCustomer(...) {    // Implement delete customer here    // Return true on success, false on failure   }   public Customer findCustomer(...) {    // Implement find a customer here using supplied    // argument values as search criteria    // Return a value object if found,    // return null on error or if not found   }   public boolean updateCustomer(...) {    // implement update record here using data    // from the customerData value object    // Return true on success, false on failure or    // error   }   public RowSet selectCustomersRS(...) {    // implement search customers here using the    // supplied criteria.    // Return a RowSet.   }   public Collection selectCustomersVO(...) {    // implement search customers here using the    // supplied criteria.    // Alternatively, implement to return a Collection    // of value objects.   }   ... }

Java模式设计之数据访问对象模式(6)

时间:2010-12-06

Example 9.5 Customer value Object

public class Customer implements java.io.Serializable {   // member variables   int CustomerNumber;   String name;   String streetAddress;   String city;   ...   // getter and setter methods...   ... }

Example 9.6 Using a DAO and DAO Factory ?Client Code

... // create the required DAO Factory DAOFactory cloudscapeFactory = DAOFactory.getDAOFactory(DAOFactory.DAOCLOUDSCAPE); // Create a DAO CustomerDAO custDAO = cloudscapeFactory.getCustomerDAO(); // create a new customer int newCustNo = custDAO.insertCustomer(...); // Find a customer object. Get the value object. Customer cust = custDAO.findCustomer(...); // modify the values in the value object. cust.setAddress(...); cust.setEmail(...); // update the customer object using the DAO custDAO.updateCustomer(cust); // delete a customer object custDAO.deleteCustomer(...); // select all customers in the same city Customer criteria=new Customer(); criteria.setCity("广州"); Collection customersList = custDAO.selectCustomersVO(criteria); // returns customersList - collection of Customer // value objects. iterate through this collection to // get values. ...

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