Spring Template Spring的JDBC(一)

使用Spring JDBC,你只需要做四个工作：
1）定义连接参数：也就是定义url,driver,user,password这个几个参数，一般我们会用一个jdbc.properties文件来配置。
2）指定要执行那个sql语句：项目中要用到什么样的SQL语句，Spring是肯定不知道的，只能我们自己设置的。
3）使用PreparedStatement时需要参数，传递哪些参数肯定也是需要我们自己设置的。
4）迭代结果集的过程需要做那些事情，肯定也是需要我们自己写的。

JdbcTemplate 的使用需要有 DataSource 的支持，所以在配置文件中，我们首先要配置一个 DataSource ，
然后在将这个 DataSource 配置到 JdbcTemplate 里。
接着将 JdbcTemplate 配置进 DAO 层，最后将 DAO 配置进 Model 层。

首先是整个案例的结构.....

然后先看配置文件吧...

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
         http://www.springframework.org/schema/beans/spring-beans.xsd
         http://www.springframework.org/schema/context
         http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="org.springframework.docs.test" />
    <context:property-placeholder location="jdbc.properties"/>

    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <bean id="userDao" class="com.dao.impl.UserDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"/>
    </bean>

    <bean id="userService" class="com.service.impl.UserServiceImpl">
        <property name="userDao" ref="userDao"></property>
    </bean>
</beans>

jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=1234

model

package com.model;

/**
 * Created by cyx on 2016/3/5.
 */
public class User {
    private int id;
    private String name;
    private int age;

    public User() {

    }

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public User(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

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

userDao

package com.dao;

import com.model.User;

import java.util.List;

/**
 * Created by cyx on 2016/3/5.
 */
public interface UserDao {
    public void add(User user);

    public void update(User user);

    public void delete(int id);

    public List<User> queryAll();
}

userDaoimpl userDao的实现

package com.dao.impl;

import com.dao.UserDao;
import com.model.User;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;

/**
 * Created by cyx on 2016/3/5.
 */
public class UserDaoImpl implements UserDao {

    private JdbcTemplate jdbcTemplate;

    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }


    public void add(User user) {
        String sql = "insert into user_t (name,age) values (?,?)";
        Object[] args = {user.getName(), user.getAge()};
        int res = jdbcTemplate.update(sql, args);
        if (res == 1) {
            System.out.println("add success");
        }
    }

    public void update(User user) {
        String sql = "update user_t set name = ?, age = ? where id = ?";
        Object[] args = {user.getName(), user.getAge(), user.getId()};
        int res = jdbcTemplate.update(sql, args);
        if (res == 1) {
            System.out.println("update success");
        }
    }

    public void delete(int id) {
        String sql = "delete from user_t where id = ?";
        int res = jdbcTemplate.update(sql, id);
        if (res == 1) {
            System.out.println("delete success");
        }
    }

    public List<User> queryAll() {
        String sql = "select * from user_t";
        final List<User> list = new ArrayList<User>();
        jdbcTemplate.query(sql, new RowCallbackHandler() {
            public void processRow(ResultSet rs) throws SQLException {
                User u = new User();
                u.setId(rs.getInt("id"));
                u.setName(rs.getString("name"));
                u.setAge(rs.getInt("age"));
                list.add(u);
            }
        });
        return list;
    }

}

userService

package com.service;

import com.model.User;

import java.util.List;

/**
 * Created by cyx on 2016/3/5.
 */
public interface UserService {
    public void add(User user);

    public void update(User user);

    public void delete(int id);

    public List<User> queryAll();
}

userService 的实现 userServiceImpl

package com.service.impl;

import com.dao.UserDao;
import com.model.User;
import com.service.UserService;

import java.util.List;

/**
 * Created by cyx on 2016/3/6.
 */
public class UserServiceImpl implements UserService {

    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    public void add(User user) {
        this.userDao.add(user);
    }

    public void update(User user) {
        this.userDao.update(user);
    }

    public void delete(int id) {
        this.userDao.delete(id);
    }

    public List<User> queryAll() {
        return this.userDao.queryAll();
    }
}

Test 测试代码

package com.test;

import java.util.List;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.model.User;
import com.service.UserService;

public class jdbcTemplateTest {
	private static ApplicationContext ac;
	
	static {
		ac = new ClassPathXmlApplicationContext("beans.xml");
	}
	
	@Test
	public void testAdd(){
		UserService us = (UserService)ac.getBean("userService");
		us.add(new User("2b",22));
	}
	
	@Test
	public void testUpdate(){
		UserService us = (UserService)ac.getBean("userService");
		us.update(new User(1,"2b",11));
	}
	
	@Test
	public void testdelete(){
		UserService us = (UserService)ac.getBean("userService");
		us.delete(1);
	}
	
	@Test
	public void testQueryAll(){
		UserService us = (UserService)ac.getBean("userService");
		List<User> list = us.queryAll();
		for(User u :list){
			System.out.println(u.getId()+" , "+u.getName()+" , "+u.getAge());
		}
	}
}

参考文章: http://item.congci.com/item/spring-jdbctemplate-shili