package com.xxx.xxx.config;

import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.pagination.DialectFactory;
import com.baomidou.mybatisplus.extension.plugins.pagination.dialects.IDialect;
import com.baomidou.mybatisplus.extension.toolkit.JdbcUtils;
import org.apache.ibatis.executor.Executor;

/**
 * <p>
 * 自动分页拦截器,自动动态调整数据库方言
 * </p>
 *
 * @author zhoujk
 * @since 2023-8-1
 */
public class AutoPaginationInnerInterceptor extends PaginationInnerInterceptor {


    @Override
    protected IDialect findIDialect(Executor executor) {
        return DialectFactory.getDialect(JdbcUtils.getDbType(executor));
    }

}

         首先定义一个 分页拦截器，重写父类 findIDialect 方法,通过 JdbcUtils.getDbType(executor)

得到当前sql 执行的数据源类型，然后通过方言工厂动态的获取 数据源方言；

package com.xxx.xxx.config;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import icu.mhb.mybatisplus.plugln.injector.JoinDefaultSqlInjector;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;


/**
 * MyBatis拦截器
 */
@Configuration
@EnableTransactionManagement
@MapperScan({"com.xxx.xxx.*.mapper","com.xxx.xxx.dao","com.xxx.xxx.mapper"})
public class MybatisPlusConfig extends JoinDefaultSqlInjector {
    /**
     * 分页插件
     */
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        //多数据源 根据数据库类型自动调整数据库方言
        interceptor.addInnerInterceptor(new AutoPaginationInnerInterceptor());
        return interceptor;
    }
 

}

 然后将自动分页拦截器 AutoPaginationInnerInterceptor 添加到 Mybatis的拦截器中，就OK了