spring对dao层的支持

drop table if exists user; 

/*==============================================================*/
/* Table: user                                                  */ 
/*==============================================================*/
create table user 
( 
   id                   bigint AUTO_INCREMENT not null, 
   name                 varchar(24), 
   age                  int, 
   primary key (id) 
);

public class User { 
    private Integer id; 
    private String name; 
    private Integer age; 

    public Integer getId() { 
        return id; 
    } 

    public void setId(Integer id) { 
        this.id = id; 
    } 

    public String getName() { 
        return name; 
    } 

    public void setName(String name) { 
        this.name = name; 
    } 

    public Integer getAge() { 
        return age; 
    } 

    public void setAge(Integer age) { 
        this.age = age; 
    } 
}

/** 
* Created by IntelliJ IDEA.<br> 
* <b>User</b>: leizhimin<br> 
* <b>Date</b>: 2008-4-22 15:34:36<br> 
* <b>Note</b>: DAO接口 
*/ 
public interface IUserDAO { 
    public void insert(User user); 

    public User find(Integer id); 
}

import javax.sql.DataSource; 
import java.sql.Connection; 
import java.sql.SQLException; 

/** 
* Created by IntelliJ IDEA.<br> 
* <b>User</b>: leizhimin<br> 
* <b>Date</b>: 2008-4-22 13:53:56<br> 
* <b>Note</b>: 基类DAO，提供了数据源注入 
*/ 
public class BaseDAO { 
    private DataSource dataSource; 

    public DataSource getDataSource() { 
        return dataSource; 
    } 

    public void setDataSource(DataSource dataSource) { 
        this.dataSource = dataSource; 
    } 

    public Connection getConnection() { 
        Connection conn = null; 
        try { 
            conn = dataSource.getConnection(); 
        } catch (SQLException e) { 
            e.printStackTrace(); 
        } 
        return conn; 
    } 
}

/** 
* Created by IntelliJ IDEA.<br> 
* <b>User</b>: leizhimin<br> 
* <b>Date</b>: 2008-4-22 15:36:04<br> 
* <b>Note</b>: DAO实现 
*/ 
public class UserDAO extends BaseDAO implements IUserDAO { 

    public JdbcTemplate getJdbcTemplate(){ 
        return new JdbcTemplate(getDataSource()); 
    } 
    public void insert(User user) { 
        String name = user.getName(); 
        int age = user.getAge().intValue(); 

//        jdbcTemplate.update("INSERT INTO user (name,age) " 
//                + "VALUES(‘" + name + "‘," + age + ")"); 

        String sql = "insert into user(name,age) values(?,?)"; 
        getJdbcTemplate().update(sql,new Object[]{name,age}); 
    } 

    public User find(Integer id) { 
        List rows = getJdbcTemplate().queryForList( 
                "SELECT * FROM user WHERE id=" + id.intValue()); 

        Iterator it = rows.iterator(); 
        if (it.hasNext()) { 
            Map userMap = (Map) it.next(); 
            Integer i = new Integer(userMap.get("id").toString()); 
            String name = userMap.get("name").toString(); 
            Integer age = new Integer(userMap.get("age").toString()); 

            User user = new User(); 

            user.setId(i); 
            user.setName(name); 
            user.setAge(age); 

            return user; 
        } 
        return null; 
    } 
}

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE beans PUBLIC "-//SPRING/DTD BEAN/EN" 
        "http://www.springframework.org/dtd/spring-beans.dtd"> 

<beans> 
    <bean id="dataSource" 
          class="org.apache.commons.dbcp.BasicDataSource" singleton="true"> 
        <property name="driverClassName"> 
            <value>com.mysql.jdbc.Driver</value> 
        </property> 
        <property name="url"> 
            <value>jdbc:mysql://localhost:3306/springdb</value> 
        </property> 
        <property name="username"> 
            <value>root</value> 
        </property> 
        <property name="password"> 
            <value>leizhimin</value> 
        </property> 
    </bean> 

    <bean id="baseDAO" class="com.lavasoft.springnote.ch05_jdbc03_temp.BaseDAO" abstract="true"> 
        <property name="dataSource"> 
            <ref bean="dataSource"/> 
        </property> 
    </bean> 

    <bean id="userDAO" 
          class="com.lavasoft.springnote.ch05_jdbc03_temp.UserDAO" parent="baseDAO"> 
    </bean> 

</beans>

import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.FileSystemXmlApplicationContext; 

/** 
* Created by IntelliJ IDEA.<br> 
* <b>User</b>: leizhimin<br> 
* <b>Date</b>: 2008-4-22 15:59:18<br> 
* <b>Note</b>: 测试类，客户端 
*/ 
public class SpringDAODemo { 
    public static void main(String[] args) { 
        ApplicationContext context = new FileSystemXmlApplicationContext("D:\\_spring\\src\\com\\lavasoft\\springnote\\ch05_jdbc03_temp\\bean-jdbc-temp.xml"); 
        User user = new User(); 
        user.setName("hahhahah"); 
        user.setAge(new Integer(22)); 
        IUserDAO userDAO = (IUserDAO) context.getBean("userDAO"); 
        userDAO.insert(user); 
        user = userDAO.find(new Integer(1)); 
        System.out.println("name: " + user.getName()); 
    } 
}

log4j:WARN No appenders could be found for logger (org.springframework.core.CollectionFactory). 
log4j:WARN Please initialize the log4j system properly. 
name: jdbctemplate 

Process finished with exit code 0