SpringBoot 实战 (六) | 用 JdbcTemplates 访问 Mysql

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微信公众号：一个优秀的废人
如有问题或建议，请后台留言，我会尽力解决你的问题。

如题，今天介绍 springboot 通过jdbc访问关系型mysql,通过 spring 的 JdbcTemplate 去访问。

SpringBoot 2.x

jdk 1.8

maven 3.0

idea

mysql

构建 SpringBoot 项目，不会的朋友参考旧文章：如何使用 IDEA 构建 Spring Boot 工程

xml
        
        
            org.springframework.boot
            spring-boot-starter-jdbc
        
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
        
            mysql
            mysql-connector-java
            runtime
        
        
        
        
            com.alibaba
            druid
            1.1.13
        

     
           org.springframework.boot
           spring-boot-starter-test
           test
    

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC&useSSL=true
    username: 数据库用户名
    password: 数据库密码

package com.nasus.domain;

/**
 * Project Name:jdbctemplate_demo 

 * Package Name:com.nasus.domain 

 * Date:2019/2/3 10:55 

 * Description: TODO: 描述该类的作用 

 *
 * @author nasus

 * Copyright Notice =========================================================
 * This file contains proprietary information of Eastcom Technologies Co. Ltd.
 * Copying or reproduction without prior written approval is prohibited.
 * Copyright (c) 2019 =======================================================
 */
public class Student {

    private Integer id;

    private String name;

    private Integer age;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name="" + name + """ +
                ", age=" + age +
                "}";
    }
}

package com.nasus.dao;

import com.nasus.domain.Student;
import java.util.List;

/**
 * Project Name:jdbctemplate_demo 

 * Package Name:com.nasus.dao 

 * Date:2019/2/3 10:59 

 * Description: TODO: 描述该类的作用 

 * @author nasus

 */
public interface IStudentDao {

    int add(Student student);

    int update(Student student);

    int delete(int id);

    Student findStudentById(int id);

    List findStudentList();

}

具体实现类：

package com.nasus.dao.impl;

import com.nasus.dao.IStudentDao;
import com.nasus.domain.Student;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

/**
 * Project Name:jdbctemplate_demo 

 * Package Name:com.nasus.dao.impl 

 * Date:2019/2/3 11:00 

 * Description: TODO: 描述该类的作用 

 *
 * @author nasus

 */
@Repository
public class IStudentDaoImpl implements IStudentDao{

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @Override
    public int add(Student student) {
        return jdbcTemplate.update("insert into student(name, age) values(?, ?)",
                student.getName(),student.getAge());
    }

    @Override
    public int update(Student student) {
        return jdbcTemplate.update("UPDATE  student SET NAME=? ,age=? WHERE id=?",
                student.getName(),student.getAge(),student.getId());
    }

    @Override
    public int delete(int id) {
        return jdbcTemplate.update("DELETE from TABLE student where id=?",id);
    }

    @Override
    public Student findStudentById(int id) {
        // BeanPropertyRowMapper 使获取的 List 结果列表的数据库字段和实体类自动对应
        List list = jdbcTemplate.query("select * from student where id = ?", new Object[]{id}, new BeanPropertyRowMapper(Student.class));
        if(list!=null && list.size()>0){
            Student student = list.get(0);
            return student;
        }else{
            return null;
        }
    }

    @Override
    public List findStudentList() {
        // 使用Spring的JdbcTemplate查询数据库，获取List结果列表，数据库表字段和实体类自动对应，可以使用BeanPropertyRowMapper
        List list = jdbcTemplate.query("select * from student", new Object[]{}, new BeanPropertyRowMapper(Student.class));
        if(list!=null && list.size()>0){
            return list;
        }else{
            return null;
        }
    }

}

package com.nasus.service;

import com.nasus.domain.Student;
import java.util.List;

/**
 * Project Name:jdbctemplate_demo 

 * Package Name:com.nasus.service 

 * Date:2019/2/3 11:17 

 * Description: TODO: 描述该类的作用 

 *
 * @author nasus

 */
public interface IStudentService {

    int add(Student student);

    int update(Student student);

    int delete(int id);

    Student findStudentById(int id);

    List findStudentList();

}

实现类：

package com.nasus.service.impl;

import com.nasus.dao.IStudentDao;
import com.nasus.domain.Student;
import com.nasus.service.IStudentService;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

/**
 * Project Name:jdbctemplate_demo 

 * Package Name:com.nasus.service.impl 

 * Date:2019/2/3 11:18 

 * Description: TODO: 描述该类的作用 

 *
 * @author nasus

 * Copyright Notice =========================================================
 * This file contains proprietary information of Eastcom Technologies Co. Ltd.
 * Copying or reproduction without prior written approval is prohibited.
 * Copyright (c) 2019 =======================================================
 */
@Repository
public class IStudentServiceImpl implements IStudentService {

    @Autowired
    private IStudentDao iStudentDao;

    @Override
    public int add(Student student) {
        return iStudentDao.add(student);
    }

    @Override
    public int update(Student student) {
        return iStudentDao.update(student);
    }

    @Override
    public int delete(int id) {
        return iStudentDao.delete(id);
    }

    @Override
    public Student findStudentById(int id) {
        return iStudentDao.findStudentById(id);
    }

    @Override
    public List findStudentList() {
        return iStudentDao.findStudentList();
    }

}

package com.nasus.controller;

import com.nasus.domain.Student;
import com.nasus.service.IStudentService;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Project Name:jdbctemplate_demo 

 * Package Name:com.nasus.controller 

 * Date:2019/2/3 11:21 

 * Description: TODO: 描述该类的作用 

 *
 * @author nasus

 */
@RestController
@RequestMapping("/student")
public class StudentController {

    @Autowired
    private IStudentService iStudentService;

    @PostMapping("")
    public int addStudent(@RequestBody Student student){
        return iStudentService.add(student);
    }

    @PutMapping("/{id}")
    public String updateStudent(@PathVariable Integer id, @RequestBody Student student){
        Student oldStudent = new Student();
        oldStudent.setId(id);
        oldStudent.setName(student.getName());
        oldStudent.setAge(student.getAge());
        int t = iStudentService.update(oldStudent);
        if (t == 1){
            return student.toString();
        }else {
            return "更新学生信息错误";
        }
    }

    @GetMapping("/{id}")
    public Student findStudentById(@PathVariable Integer id){
        return iStudentService.findStudentById(id);
    }

    @GetMapping("/list")
    public List findStudentList(){
        return iStudentService.findStudentList();
    }

    @DeleteMapping("/{id}")
    public int deleteStudentById(@PathVariable Integer id){
        return iStudentService.delete(id);
    }
}

其他的 api 测试可以通过 postman 测试。我这里已经全部测试通过，请放心使用。

源码下载：https://github.com/turoDog/De...

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