當數據量比較大的時候，我們就需要考慮讀寫分離了，也就是動態切換數據庫連接,對指定的數據庫進行操作。在spring中實現動態的切換無非就是利用AOP實現。我們可以使用mybatis-plus作者開發的插件dynamic-datasource-spring-boot-starter。

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

新建項目引入依賴

<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 #設置默認的數據源或者數據源組,默認值即為master strict: false #設置嚴格模式,默認false不啟動. 啟動后在未匹配到指定數據源時候會拋出異常,不啟動則使用默認數據源. datasource: master: #替換成自己的數據庫連接 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配置我就不多說了，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('添加用戶失敗'); } return '添加用戶成功'; } @DS('slave_1') @Override public IPage<UserInfo> pageUser(PageRequest request) { return page(new Page<>(request.getPageNum(), request.getPageSize()), Wrappers.<UserInfo>lambdaQuery().orderByDesc(BaseEntity::getCreateTime)); }}

在方法上或者類上加@DS('master')注解，來指定數據源

更換為自己的數據庫連接，以及建庫，運行resources/sql目錄下的sql文件然后啟動項目訪問http://127.0.0.1:8081/doc.html進行測試

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