spring boot 登录注册 demo （二） -- 数据库访问

　　　　　<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

spring.datasource.url=jdbc:mysql://localhost/testdemo
spring.datasource.username=guest
spring.datasource.password=guest
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.hbm2ddl.auto=update

package com.jwen.login.dao;

import java.util.List;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

import com.jwen.login.domain.User;

public interface UserRepository extends JpaRepository<User, Long> {

    public List<User> findByName(String name);
    
    public List<User> findByNameAndPassword(String name,String password);

    @Query("from User u where u.name=:name")
    public List<User> findUser(@Param("name") String name);

}

package com.jwen.login.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.jwen.login.dao.UserRepository;
import com.jwen.login.domain.User;

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public boolean verifyUser(User user) {

        if (userRepository.findByNameAndPassword(user.getName(), user.getPassword()).isEmpty()) {
            return false;
        } else {
            return true;
        }

    }

    public String registerUser(User user) {

        if (userRepository.findByName(user.getName()).isEmpty()) {
            userRepository.save(user);
            return "用户名  " + user.getName() + " 注册成功";

        } else {

            return "用户名 " + user.getName() + "已被占用！";
        }

    }
}