spring boot动态切换数据源的实现

当数据量比较大的时候，我们就需要考虑读写分离了，也就是动态切换数据库连接,对指定的数据库进行操作。在spring中实现动态的切换无非就是利用AOP实现。我们可以使用mybatis-plus作者开发的插件dynamic-datasource-spring-boot-starter。

demo地址：https://github.com/songshijun1995/spring-boot-dynamic-demo

新建项目引入依赖

<dependency> <groupId>com.baomidou</groupId> <artifactId>dynamic-datasource-spring-boot-starter</artifactId> <version>3.3.1</version></dependency><dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.1</version></dependency>

配置yml

server: port: 8081 servlet: context-path: /spring: application: name: spring-boot-dynamic-demo datasource: dynamic: primary: master #设置默认的数据源或者数据源组,默认值即为master strict: false #设置严格模式,默认false不启动. 启动后在未匹配到指定数据源时候会抛出异常,不启动则使用默认数据源. datasource: master: #替换成自己的数据库连接 url: jdbc:mysql://127.0.0.1:3306/dynamic1?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8&nullCatalogMeansCurrent=true&allowMultiQueries=true&rewriteBatchedStatements=true username: root password: 123456 driver-class-name: com.mysql.cj.jdbc.Driver slave_1: url: jdbc:mysql://127.0.0.1:3306/dynamic2?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&failOverReadOnly=false&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8&nullCatalogMeansCurrent=true&allowMultiQueries=true&rewriteBatchedStatements=true username: root password: 123456 driver-class-name: com.mysql.cj.jdbc.Drivermybatis-plus: configuration: log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpl global-config: db-config: logic-delete-value: 1 logic-not-delete-value: 0 logic-delete-field: deleted mapper-locations: classpath:/mapper/**.xmllogging: level: ROOT: INFO com.dynamic.dynamicdemo: DEBUG pattern: file: ’%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level [%thread] %logger{50} - %msg%n’ file: name: ${logging.file.path}/${spring.application.name}.log path: /home/logs/${spring.application.name} logback: rollingpolicy: max-file-size: 10MB max-history: 30

mybatis-plus和swagger配置我就不多说了，demo里都有

如何使用

package com.dynamic.dynamicdemo.service.impl;import com.baomidou.dynamic.datasource.annotation.DS;import com.baomidou.mybatisplus.core.metadata.IPage;import com.baomidou.mybatisplus.core.toolkit.Wrappers;import com.baomidou.mybatisplus.extension.plugins.pagination.Page;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;import com.dynamic.dynamicdemo.dto.PageRequest;import com.dynamic.dynamicdemo.dto.UserInfoRequest;import com.dynamic.dynamicdemo.entities.BaseEntity;import com.dynamic.dynamicdemo.entities.UserInfo;import com.dynamic.dynamicdemo.mapper.UserInfoMapper;import com.dynamic.dynamicdemo.service.UserInfoService;import org.springframework.beans.BeanUtils;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;@Servicepublic class UserInfoServiceImpl extends ServiceImpl<UserInfoMapper, UserInfo> implements UserInfoService { @DS('master') @Transactional(rollbackFor = Exception.class) @Override public String saveUser(UserInfoRequest request) { UserInfo userInfo = new UserInfo(); BeanUtils.copyProperties(request, userInfo); boolean save = save(userInfo); if (!save) { throw new RuntimeException('添加用户失败'); } return '添加用户成功'; } @DS('slave_1') @Override public IPage<UserInfo> pageUser(PageRequest request) { return page(new Page<>(request.getPageNum(), request.getPageSize()), Wrappers.<UserInfo>lambdaQuery().orderByDesc(BaseEntity::getCreateTime)); }}

在方法上或者类上加@DS('master')注解，来指定数据源

更换为自己的数据库连接，以及建库，运行resources/sql目录下的sql文件然后启动项目访问http://127.0.0.1:8081/doc.html进行测试

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