(5)操作数据库

1.

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

2.

创建一个application.yml文件

spring:
  datasource:
    username: root
    password: xxx
    url: jdbc:mysql://127.0.0.1:3306/dbname
    driver-class-name:com.mysql.cj.jdbc.Driver

3.

package com.example.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;

@Controller
public class StudentController {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    @ResponseBody
    @RequestMapping("/")
    public Object index() {
        List<Map<String, Object>> list = jdbcTemplate.queryForList("select * from student ");
        return list;
    }
}