JdbcTmplate中的update方法(代码)基础操作

ゝ一纸荒年。 2023-10-07 10:23 1阅读 0赞

User.java实体类：

package com.liu.jdbc.update;
    
    public class User {
        
    	private Integer id;
    	private String username;
    	private String password;
    	
    	public Integer getId() {
        
    		return id;
    	}
    	public void setId(Integer id) {
        
    		this.id = id;
    	}
    	public String getUsername() {
        
    		return username;
    	}
    	public void setUsername(String username) {
        
    		this.username = username;
    	}
    	public String getPassword() {
        
    		return password;
    	}
    	public void setPassword(String password) {
        
    		this.password = password;
    	}
    	@Override
    	public String toString() {
        
    		return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
    	}
    	
    	
    
    }

UserDao.java接口：

package com.liu.jdbc.update;
    
    public interface UserDao {
        
    	public int addUser(User user);
    	public int updateUser(User user);
    	public int deleteUser(int id);
    
    }

UserDaoImpl.java实现类：

package com.liu.jdbc.update;
    
    import org.springframework.jdbc.core.JdbcTemplate;
    
    public class UserDaoImpl implements UserDao {
        
    	//声明JdbcTemplate属性及其setter方法
    	private JdbcTemplate jdbcTemplate;
    	
    
    	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
        
    		this.jdbcTemplate = jdbcTemplate;
    	}
    
    	//添加方法
    	@Override
    	public int addUser(User user) {
        
    		// TODO Auto-generated method stub
    		//定义SQL语句
    		String sql = "insert into user(username,password) values(?,?)";
    		//定义数组来存放SQL中的参数
    		Object[] obj = new Object[] {
        user.getUsername(),user.getPassword()};
    		//执行添加操作 返回的是受影响的行数
    		int i = this.jdbcTemplate.update(sql, obj);
    		return i;
    
    	}
    	
    	//更新方法
    	@Override
    	public int updateUser(User user) {
        
    		// TODO Auto-generated method stub
    		//定义SQL语句
    		String sql = "update user set username = ?,password = ? where id = ?";
    		//定义数组 存放SQL中的参数
    		Object[] obj = new Object[] {
        user.getUsername(),user.getPassword(),user.getId()};
    		//执行更新操作 返回的是受影响的行数
    		int i = this.jdbcTemplate.update(sql, obj);
    		return i;
    
    	}
    
    	//删除方法
    	@Override
    	public int deleteUser(int id) {
        
    		// TODO Auto-generated method stub
    
    		//定义SQL语句
    		String sql = "delete from user where id = ?";
    		//执行删除操作 返回的是受影响的行数
    		int i = this.jdbcTemplate.update(sql, id);
    		return i;
    	}
    
    }

ApplicationContext.xml配置文件：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    	xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-4.3.xsd">
    		
    		
    		<bean id = "dataSource" class = "org.springframework.jdbc.datasource.DriverManagerDataSource">
    			
    			<property name="driverClassName" value = "com.mysql.jdbc.Driver"></property>
    			
    			<property name="url" value = "jdbc:mysql://localhost:3306/test"></property>
    			
    			<property name="username" value = "root"></property>
    			
    			<property name="password" value = "root"></property>
    		</bean>
    		
    		<bean id = "jdbcTemplate" class = "org.springframework.jdbc.core.JdbcTemplate">
    			
    			<property name="dataSource" ref = "dataSource"></property>
    		</bean>
    
    		
    		<bean id = "userDao" class = "com.liu.jdbc.update.UserDaoImpl">
    			<property name="jdbcTemplate" ref ="jdbcTemplate"></property>
    		</bean>
    
    </beans>

Test.java测试类：

package com.liu.jdbc.update;
    
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    public class Test {
        
    	
    	public static void main(String args[]) {
        
    		Test test = new Test();
    		test.add();
    //		test.update();
    //		test.delete();
    	}
    	
    	//添加操作
    	public void add() {
        
    		String xmlpath = "com/liu/jdbc/update/ApplicationContext.xml";
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
    		UserDao userDao = (UserDao) applicationContext.getBean("userDao");
    		User user = new User();
    		user.setUsername("张三");
    		user.setPassword("123456");
    		int i = userDao.addUser(user);
    		if(i>0) {
        
    			System.out.println("添加操作成功，影响了"+i+"条数据");
    		}else {
        
    			System.out.println("添加操作失败");
    		}
    	}
    	
    	//更新操作
    	public void update() {
        
    		String xmlpath = "com/liu/jdbc/update/ApplicationContext.xml";
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
    		UserDao userDao = (UserDao) applicationContext.getBean("userDao");
    		User user = new User();
    		user.setUsername("李四");
    		user.setPassword("111111");
    		user.setId(1);
    		int i = userDao.updateUser(user);
    		if(i>0) {
        
    			System.out.println("更新操作成功，影响了"+i+"条数据");
    		}else {
        
    			System.out.println("更新操作失败");
    		}
    	}
    	
    	//删除操作
    	public void delete() {
        
    		String xmlpath = "com/liu/jdbc/update/ApplicationContext.xml";
    		ApplicationContext applicationContext = new ClassPathXmlApplicationContext(xmlpath);
    		UserDao userDao = (UserDao) applicationContext.getBean("userDao");
    		int i = userDao.deleteUser(1);
    		if(i>0) {
        
    			System.out.println("删除操作成功，影响了"+i+"条数据");
    		}else {
        
    			System.out.println("删除操作失败");
    		}
    	}
    
    }