SpringBoot的jdbc进行数据库的l连接

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