SpringBoot 整合 JDBC 实例

0、数据库表

CREATE DATABASE springboot;
USE springboot;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `name` varchar(50) DEFAULT NULL COMMENT '姓名',
  `age` int(11) DEFAULT NULL COMMENT '年龄',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

INSERT INTO  user values (1,"村雨遥",25);
INSERT INTO  user values (2,"张三",26);
INSERT INTO  user values (3,"李四",27);

1、

package com.cunyu.controller;

import com.cunyu.pojo.User;
import com.cunyu.service.UserService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

/**
 * @author : cunyu
 * @version : 1.0
 * @className : UserController
 * @date : 2020/7/29 16:22
 * @description : UserController
 */


@RequestMapping("/user")
@RestController
public class UserController {
    private static final Logger logger = LoggerFactory.getLogger(UserController.class);

    private final UserService userService;

    public UserController(UserService userService) {
        this.userService = userService;
    }

    @GetMapping("/list")
    public List<User> getUsers() {
        logger.info("从数据库读取数据");//打印到console
        return userService.getList();
    }
}

2、

package com.cunyu.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.stereotype.Component;

/**
 * @author : cunyu
 * @version : 1.0
 * @className : Author
 * @date : 2020/7/29 16:20
 * @description : User 实体类
 */

@Component
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Long id;
    private String name;
    private Integer age;
}

3

package com.cunyu.service;

import com.cunyu.pojo.User;

import java.util.List;

/**
 * @author : cunyu
 * @version : 1.0
 * @className : UserService
 * @date : 2020/7/29 21:12
 * @description : TODO
 */

public interface UserService {
    /**
     * @param
     * @return
     * @description 获取所有数据列表
     * @date 2020/7/29 21:57
     * @author cunyu1943
     * @version 1.0
     */
    public List<User> getList();
}

4

package com.cunyu.service.Impl;

import com.cunyu.pojo.User;
import com.cunyu.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Service;

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

/**
 * @author : cunyu
 * @version : 1.0
 * @className : UserServiceImpl
 * @date : 2020/7/29 21:13
 * @description : TODO
 */

@Service
public class UserServiceImpl implements UserService {

    private final JdbcTemplate jdbcTemplate;

    public UserServiceImpl(JdbcTemplate jdbcTemplate) {
        this.jdbcTemplate = jdbcTemplate;
    }

    @Override
    public List<User> getList() {
        String sql = "SELECT id, name, age FROM user";
        return (List<User>) jdbcTemplate.query(sql, new RowMapper<User>() {

            @Override
            public User mapRow(ResultSet resultSet, int i) throws SQLException {
                User user = new User();
                user.setId(resultSet.getLong("id"));
                user.setName(resultSet.getString("name"));
                user.setAge(resultSet.getInt("age"));
                return user;
            }
        });
    }
}

5

package com.cunyu;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class JdbcPracApplication {

    public static void main(String[] args) {
        SpringApplication.run(JdbcPracApplication.class, args);
    }

}

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