baomidou dynamic-datasource 强制查询sql走主库

场景

因为引用了baomidou主从数据源,因为业务场景特殊,需要查询语句强制走主库,把解决方案分享出来,帮助大家少走弯路

pom依赖

java 复制代码
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
    <version>3.6.1</version>
</dependency>

主从配置

java 复制代码
package com.baomidou.config;


import com.baomidou.dynamic.datasource.plugin.MasterSlaveAutoRoutingPlugin;
import com.baomidou.interceptor.MasterSlaveAutoRoutingOrSelectByRulePlugin;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


/**
 * 主从配置
 */
@Configuration
public class MasterSlaveAutoRoutingPluginConfig {


    /**
     * xml文件sql语句标签名包含'FromMaster' 会去主库查询
     */

    @Bean
    public MasterSlaveAutoRoutingOrSelectByRulePlugin masterSlaveAutoRoutingPlugin(){
        return new MasterSlaveAutoRoutingOrSelectByRulePlugin();
    }

}

拦截器

java 复制代码
package com.baomidou.interceptor;

import com.baomidou.dynamic.datasource.support.DdConstants;
import com.baomidou.dynamic.datasource.toolkit.DynamicDataSourceContextHolder;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.springframework.beans.factory.annotation.Autowired;

import javax.annotation.Resource;
import javax.sql.DataSource;
import java.util.Properties;

/**
 * 根据 baomidou MasterSlaveAutoRoutingPlugin 修改符合自己的调用规则(目前根据sql方法的唯一id来判断)
 * 自动切换主从或者根据方法名指定路由
 */
@Intercepts({
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class}),
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class}),
        @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class})})
@Slf4j
public class MasterSlaveAutoRoutingOrSelectByRulePlugin implements Interceptor {
    /**
     * xml文件sql语句标签名包含'FromMaster' 会去主库查询
     * 如 '<select id="find***FromMaster" ...>'
     */
    public static final String FROM_MASTER = "FromMaster";


    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        Object[] args = invocation.getArgs();
        MappedStatement ms = (MappedStatement) args[0];
        String pushedDataSource = null;
        try {
            if (ms.getId().contains(MasterSlaveAutoRoutingOrSelectByRulePlugin.FROM_MASTER_HT) && SqlCommandType.SELECT == ms.getSqlCommandType()) {
                pushedDataSource = DynamicDataSourceContextHolder.push(DdConstants.MASTER);
                return invocation.proceed();
            }

            String dataSource = SqlCommandType.SELECT == ms.getSqlCommandType() ? DdConstants.SLAVE : DdConstants.MASTER;
            pushedDataSource = DynamicDataSourceContextHolder.push(dataSource);
            return invocation.proceed();
        } finally {
            if (pushedDataSource != null) {
                DynamicDataSourceContextHolder.poll();
            }
        }
    }

    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
    }
}

dao

java 复制代码
package com.baomidou.mapper;

import com.baomidou.entity.TOrder;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;

/**
 * <p>
 * Mapper 接口
 * </p>

 */
public interface TOrderMapper extends BaseMapper<TOrder> {

    TOrder findOrderFromMaster();

}

xml

java 复制代码
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.baomidou.mapper.TOrderMapper">

    
    <select id="findOrderFromMaster" resultType="com.baomidou.entity.TOrder">
            --    根据名称使sql强制走主库
    </select>

</mapper>

Yml

java 复制代码
server:
  port: 9914
  servlet:
    context-path: /baomidou
logging:
  level:
    com.baomidou.dynamic: debug
spring:
  datasource:
    dynamic:
      primary: master  # 这里需要修改
      strict: true
      hikari:
        pool-name: Yi_HikariCP
        minimum-idle: 5
        maximum-pool-size: 20
      datasource:
        # 测试
        master:
          type: com.zaxxer.hikari.HikariDataSource
          url: jdbc:mysql://localhost:3396/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=GMT%2B8
          username: admin
          password: ufcz2b8x3bas4c5m$%332
          driver-class-name: com.mysql.cj.jdbc.Driver
        slave_1:
          type: com.zaxxer.hikari.HikariDataSource
          url: jdbc:mysql://localhost:3397/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=GMT%2B8
          username: readonly
          password: 123qwe!@#
          driver-class-name: com.mysql.cj.jdbc.Driver
        slave_2:
          type: com.zaxxer.hikari.HikariDataSource
          url: jdbc:mysql://localhost:3397/test?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false&serverTimezone=GMT%2B8
          username: readonly
          password: 123qwe!@#
          driver-class-name: com.mysql.cj.jdbc.Driver
      #seata事务生效
      seata: true
      seata-mode: at

seata:
  enabled: true
  application-id: baomidou-seata
  #不使用自动代理数据源
  enable-auto-data-source-proxy: false
mybatis-plus:
#================================================= mybatis-plus start =================================================
  # classpath:/mapper/*Mapper.xml
  mapper-locations: classpath*:/mapper/*.xml
  # 实体扫描,多个package用逗号或者分号分隔
  type-aliases-package: com.user.entity
  configuration:
    # 这个配置会将执行的sql打印出来,在开发或测试的时候可以用
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    # 驼峰下划线转换
    map-underscore-to-camel-case: true
    cache-enabled: false
    # 如果查询结果中包含空值的列,则 MyBatis 在映射的时候,不会映射这个字段
    call-setters-on-nulls: false
  global-config:
    # 刷新mapper 调试神器
    refresh: true
    banner: false
    #数据库大写下划线转换
    #capital-mode: true
    #序列接口实现类配置
    #key-generator: com.baomidou.springboot.xxx
    # 数据库相关配置
    db-config:
      db-type: mysql
      # 主键类型  AUTO:"数据库ID自增", INPUT:"用户输入ID",ID_WORKER:"全局唯一ID (数字类型唯一ID)", UUID:"全局唯一ID UUID";
      id-type: UUID
      # 字段策略 IGNORED:"忽略判断",NOT_NULL:"非 NULL 判断"),NOT_EMPTY:"非空判断"
      field-strategy: NOT_EMPTY
      capital-mode: true
      #逻辑删除配置
      logic-delete-value: 1
      logic-not-delete-value: 0
#================================================= mybatis-plus end ===================================================

完结撒花 ✿✿ヽ(°▽°)ノ✿

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