轻轻松松学习SpringBoot2：第二十篇： JDBC操作

前面我们讲解如何使用jpa操作数据库   https://blog.csdn.net/stronglyh/article/details/80904531

今天我们来讲解如何使用原生jdbc的方法操作数据库

定义一个controller，一个repository

其中repository文件中

@Autowired
private JdbcTemplate jdbcTemplate;

controller文件中

@Autowired
private JDBCRepository jdbcRepository;

一：访问

controller和repository代码分别如下

    @GetMapping(value="/jdbc_tests/{id}")
    public Test testList(@PathVariable("id") Integer id){
        return jdbcRepository.getTest(id);
    }

    public void createTest(Integer id,Integer age,String name) {
        jdbcTemplate.update("INSERT INTO test(id,age,name) VALUES (?,?,?)",id,age,name);
    }

然后启动服务，用postman进行访问

二：增加

controller和repository代码分别如下

    @PostMapping(value="/jdbc_tests")
    public void testAdd(@RequestParam("id")Integer id,@RequestParam("age")Integer age,@RequestParam("name")String name){
        jdbcRepository.createTest(id,age,name);
    }

    public void createTest(Integer id,Integer age,String name) {
        jdbcTemplate.update("INSERT INTO test(id,age,name) VALUES (?,?,?)",id,age,name);
    }

我们重启服务，用postman看下效果

ok，新增成功

三：修改

controller和repository代码分别如下

   @PutMapping(value="/jdbc_tests/{id}")
    public void testUpdate(@PathVariable("id") Integer id,@RequestParam("age") Integer age,@RequestParam("name")String name){
        jdbcRepository.updateTest(id,age,name);
    }

    public void updateTest(Integer id,Integer age,String name) {
        jdbcTemplate.update("update test set age=?,name=? where id=?",age,name,id);
    }

我们重启服务，用postman看下效果（注意修改body类型）

我们再来看下数据库结果

非常的ok，id为7的数据发生了改变

四：删除

controller和repository代码分别如下

    @DeleteMapping(value="/jdbc_tests/{id}")
    public void testDelete(@PathVariable("id") Integer id){
        jdbcRepository.deleteTest(id);
    }

    public void deleteTest(Integer id){
        jdbcTemplate.update("delete from test where id=?",id);
    }

我们用postman看下结果

ok了

全部代码如下

package com.example.test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class JDBCController {

    @Autowired
    private JDBCRepository jdbcRepository;

    @GetMapping(value="/jdbc_tests/{id}")
    public Test testList(@PathVariable("id") Integer id){
        return jdbcRepository.getTest(id);
    }

    @PostMapping(value="/jdbc_tests")
    public void testAdd(@RequestParam("id")Integer id,@RequestParam("age")Integer age,@RequestParam("name")String name){
        jdbcRepository.createTest(id,age,name);
    }

    @PutMapping(value="/jdbc_tests/{id}")
    public void testUpdate(@PathVariable("id") Integer id,@RequestParam("age") Integer age,@RequestParam("name")String name){
        jdbcRepository.updateTest(id,age,name);
    }

    @DeleteMapping(value="/jdbc_tests/{id}")
    public void testDelete(@PathVariable("id") Integer id){
        jdbcRepository.deleteTest(id);
    }

}

package com.example.test;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
public class JDBCRepository{
    @Autowired
    private JdbcTemplate jdbcTemplate;

    public void createTest(Integer id,Integer age,String name) {
        jdbcTemplate.update("INSERT INTO test(id,age,name) VALUES (?,?,?)",id,age,name);
    }

    public void updateTest(Integer id,Integer age,String name) {
        jdbcTemplate.update("update test set age=?,name=? where id=?",age,name,id);
    }

    public void deleteTest(Integer id){
        jdbcTemplate.update("delete from test where id=?",id);
    }

    public Test getTest(Integer id){
        List<Test> list = jdbcTemplate.query("select * from test where id="+id,new BeanPropertyRowMapper(Test.class));
        if(list!=null && list.size()>0){
            Test test = list.get(0);
            return test;
        }
        return null;
    }

}

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