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