这里的数据库连接的是虚拟机里面docker环境下的mysql数据库（docker环境的装配在前面也有讲到https://www.cnblogs.com/zhaochunhui/p/11359544.html）
使用的是mysql的数据库，使用jdbc的链接驱动，在创建项目的时候，就要选择好我们的依赖;（jdbc、mysql、web）
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.jdbc</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.18</version>
</dependency>
<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>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
在啊application.xml或者是application.properties进行配置：
spring:
datasource:
username: root
password: root
url: jdbc:mysql://192.168.43.197:3306/jdbc
driver-class-name: com.mysql.cj.jdbc.Driver
# initialization-mode: always
# schema:
# - classpath:department.sql
（这里面是有层级关系的），设置好数据库的用户名、密码、地址（虚拟机ip/本机的localhost）
驱动的注入;以及schema的设定
在controller中编写一个请求：
package com.jdbc.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.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
import java.util.Map;
@Controller
public class Query {
@Autowired
JdbcTemplate jdbcTemplate;
@ResponseBody
@GetMapping("/query")
public Map<String,Object> map(){
List<Map<String, Object>> list = jdbcTemplate.queryForList("select * FROM department");
return list.get(0);
}
}
然后在我们发送query请求的时候就可以得到我们数据库中的第一条数据信息
原文地址：https://www.cnblogs.com/zhaochunhui/p/11371409.html