springboot：mysql+mybatis（持久层）+druid（连接池）_spring boot + mybatis + mysql 配置连接池-优快云博客

本文链接：https://blog.youkuaiyun.com/genghao/article/details/133546913

博客介绍了Spring Boot连接MySQL数据库的方法，无需通过xml文件配置。具体步骤包括添加Maven依赖、配置application.yaml文件，实现DBMapper类，编译时@Mapper自动生成实体类，最后介绍了使用时的调用方式。

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1. springboot连接mysql数据库，不需要通过xml文件配置，xml文件配置是spring的事。

2. 添加maven依赖

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>8.0.33</version>
		</dependency><!-- 数据库驱动 -->

		<dependency>
			<groupId>org.xerial</groupId>
			<artifactId>sqlite-jdbc</artifactId>
			<version>3.21.0.1</version>
		</dependency> <!-- 数据库驱动 -->

		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>druid-spring-boot-starter</artifactId>
			<version>1.2.16</version>
		</dependency> <!-- 连接池 -->

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>3.0.2</version>  <!-- 持久层 -->
		</dependency>

3. 配置文件 application.yaml

server:
  port: 8080


spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/dbone?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
    username: root
    password: root
    driver-class-name: com.mysql.cj.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

4. DBMapper类实现，只需要定义接口文件，编译时@Mapper自动生成实体类。

package com.example.dbtest.mapper;

import com.example.dbtest.entity.Users;
import org.apache.ibatis.annotations.*;

import java.util.List;


@Mapper
public interface DBMapper {
    @Select("SELECT id,username,password FROM users")
    List<Users> select_users(String username);

    @Select("SELECT password FROM users where username=#{username}")
    String find_users(String username);

    @Select("SELECT id,name,age,address FROM test")
    List<Users> findAll();

    @Select("select * from test where id=#{id}")
    Users getById(int id);

    @Insert("insert into test(id,name,age,address) values(#{id},#{name},#{age},#{address})")
    int add(Users tab);

    @Update("update test set name=#{name},age=#{age},address=#{address} where id=#{id}")
    int update(Users tab);

    @Delete("delete from test where id=#{id}")
    int deleteById(int id);
}

5. 使用时调用：

    @Resource
    private DBMapper dbMapper;


String pwd = dbMapper.find_users(username);