Spring增删改查

Spring增删改查

新建一个项目spring 新建的时候要勾选web
在web里新建一个lib包，导入以下jar包

新建以下包和JAVA文件

增删改查实现的代码如下
User中代码

public class User {
    private int id;
    private String name;
    private String password;

    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 String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

UserDao中代码

@Component
public class UserDao implements IUserDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public List<User> findAll() {
        String sql="select * from tb_user";
        BeanPropertyRowMapper<User> rowMapper=new BeanPropertyRowMapper<>(User.class);
        List<User> users=jdbcTemplate.query(sql,rowMapper);

        return users;

    }

    @Override
    public void delete(int id) {
        String sql="delete from tb_user where id=?";
        jdbcTemplate.update(sql,id);
    }

    @Override
    public void add(String username, String password) {
        String sql="insert into tb_user(username,password) values (?,?)";
        jdbcTemplate.update(sql,username,password);
    }

    @Override
    public void update(int id, String username, String password) {
        String sql="update tb_user set username=?,password=? where id=?";
        jdbcTemplate.update(sql,username,password,id);
    }
}

IUserDao中代码

public interface IUserDao {
    List<User> findAll();
    void delete(int id);
    void add(String username,String password);
    void update(int id,String username,String password);

}

UserService中代码

@Service
public class UserService implements IUserService {

    @Autowired
    private IUserDao userDao;

    @Override
    public List<User> findAll() {
        List<User> users=userDao.findAll();
        return users;
    }

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

    @Override
    public void add(String username, String password) {
        userDao.add(username,password);
    }

    @Override
    public void update(int id, String username, String password) {
        userDao.update(id,username,password);
    }
}

IUserService中

public interface IUserService {
    List<User> findAll();
    void delete(int id);
    void add(String username,String password);
    void update(int id,String username,String password);
}

Test 中代码

public class Test {
    public static void main(String[] args){

        ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
        IUserService userService=(IUserService) context.getBean("userService");
//        userService.findAll();
//        User user= (User) context.getBean("user");
//        System.out.println(user);

//        IUserDao userDao=(IUserDao) context.getBean("userDao");
//        List<User> users=userDao.findAll();
//        userDao.delete(4);
//        System.out.println(users);

//        IUserService userService= (IUserService) context.getBean("userService");
//        List<User> users1=userService.findAll();
//        System.out.println(users1);
//        userService.update(6,"aa","123");
//        List<User> users2=userService.findAll();
//        System.out.println(users2);

//        IUserService userService= (IUserService) context.getBean("userService");
        List<User> users=userService.findAll();
        System.out.println(users);
        userService.add("ccc","ccc");
        List<User> users1=userService.findAll();
        System.out.println(users1);
    }
}

spring.xml中代码

    <bean id="userService" class="com.zhongruna.service.Impl.UserService"></bean>
    <bean id="user" class="com.zhongruna.bean.User">
        <property name="id" value="1"></property>
        <property name="name" value="abc"></property>
        <property name="password" value="123"></property>
    </bean>
    
    <context:component-scan base-package="com.zhongruna"></context:component-scan>

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property value="jdbc:mysql://127.0.0.1:3306/zjgm?characterEncoding=utf-8" name="url"/>
        <property value="root" name="username"/>
        <property value="123456" name="password"/>
    </bean>
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>