Spring -- 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