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Spring DAO入门

Posted on 2007-07-18 14:04 wonderer 阅读(518) 评论(0)  编辑  收藏 所属分类: java 、database

写了个Spring的DAO入门例子。

DAO的接口

   1: package dataSourceDemo;
   2:  
   3: public interface IUserDAO {
   4:     public void insert(User user);
   5:     public User find(Integer id);
   6:  
   7: }

DAO的实现，必须要有一个setDataSource()的方法，这样才能出入DataSource。

   1: package dataSourceDemo;
   2:  
   3: import java.sql.*;
   4:  
   5: import javax.sql.DataSource;
   6:  
   7: public class UserDAO implements IUserDAO {
   8:  
   9:     private DataSource dataSource;
  10:  
  11:     public User find(Integer id) {
  12:         // TODO 自动生成方法存根
  13:         return null;
  14:     }
  15:  
  16:     public void insert(User user) {
  17:         // TODO 自动生成方法存根
  18:         String name = user.getName();
  19:         int age = user.getAge().intValue();
  20:         
  21:         Connection conn = null;
  22:         Statement stmt =null;
  23:         
  24:         try {
  25:             conn = dataSource.getConnection();
  26:             stmt = conn.createStatement();
  27:             String sql = "insert into user (name, age)"+"values('"+name+"',"+age+")";
  28:             stmt.execute(sql);
  29:         }catch(Exception e) {
  30:             e.printStackTrace();
  31:         } finally {
  32:             if(stmt != null) {
  33:                 try {
  34:                 stmt.close();
  35:                 }catch(Exception e) {
  36:                     e.printStackTrace();
  37:                 }
  38:             }
  39:             if(conn != null) {
  40:                 try {
  41:                     conn.close();
  42:                 } catch(Exception e) {
  43:                     e.printStackTrace();
  44:                 }
  45:             }
  46:         }
  47:     }
  48:  
  49:     public DataSource getDataSource() {
  50:         return dataSource;
  51:     }
  52:  
  53:     public void setDataSource(DataSource dataSource) {
  54:         this.dataSource = dataSource;
  55:     }
  56:  
  57: }

USER BEAN

   1: package dataSourceDemo;
   2:  
   3: public class User {
   4:     private Integer id;
   5:     private String name;
   6:     private Integer age;
   7:     public Integer getAge() {
   8:         return age;
   9:     }
  10:     public void setAge(Integer age) {
  11:         this.age = age;
  12:     }
  13:     public Integer getId() {
  14:         return id;
  15:     }
  16:     public void setId(Integer id) {
  17:         this.id = id;
  18:     }
  19:     public String getName() {
  20:         return name;
  21:     }
  22:     public void setName(String name) {
  23:         this.name = name;
  24:     }
  25:     
  26:  
  27: }

配置文件，可以很容易的改变dataSource的属性，就可以轻易改变数据库的配置：

   1: <?xml version="1.0" encoding="UTF-8"?>
   2: <!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN" "../resources/spring-beans-2.0.dtd" >
   3: <beans>
   4:     <bean id="dataSource"
   5:         class="org.springframework.jdbc.datasource.DriverManagerDataSource">
   6:         <property name="driverClassName">
   7:             <value>com.mysql.jdbc.Driver</value>
   8:         </property>
   9:         <property name="url">
  10:             <value>jdbc:mysql://localhost:3306/test</value>
  11:         </property>
  12:         <property name="username">
  13:             <value>root</value>
  14:         </property>
  15:         <property name="password">
  16:             <value>123</value>    
  17:         </property>
  18:     </bean>
  19:     
  20:     <bean id="userDAO" class="dataSourceDemo.UserDAO">
  21:         <property name="dataSource" ref="dataSource"></property>
  22:     </bean>
  23: </beans>

JUNIT测试类

   1: package dataSourceDemo;
   2:  
   3: import org.springframework.context.ApplicationContext;
   4: import org.springframework.context.support.ClassPathXmlApplicationContext;
   5:  
   6: import junit.framework.TestCase;
   7:  
   8: public class DataSourceTest extends TestCase {
   9:  
  10:     private ApplicationContext context;
  11:  
  12:     public void setUp() {
  13:         context = new ClassPathXmlApplicationContext(
  14:                 "dataSourceDemo/dataSource-config.xml");
  15:     }
  16:  
  17:     public void testInsert() {
  18:         User user = new User();
  19:         user.setName("老丘");
  20:         user.setAge(new Integer(21));
  21:         
  22:         IUserDAO userDAO = (IUserDAO) context.getBean("userDAO");
  23:         userDAO.insert(user);
  24:     }
  25:     
  26: }

类的结构图：

image image


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