优雅的处理tkMapper批量插入、分批次插入

Springboot框架下tkMapper想实现批量插入，一般是需要自定义BaseMapper来继承InsertListMapper

tkmapper提供的有两个insertList方法，

一个支持主键自动生成?tk.mybatis.mapper.additional.insert

一个不支持主键生成 tk.mybatis.mapper.common.special

按需使用，这里我们采用支持主键生成的InsertListMapper

import tk.mybatis.mapper.additional.insert.InsertListMapper;
import tk.mybatis.mapper.common.Mapper;

public interface BaseMapper<T> extends Mapper<T>, InsertListMapper<T> {

}

insertList批量插入

用mybatis-generator自动生成mapper和实体之后，mapper方法直接调用insertList

//自动生成的Mapper文件
public interface TAccountAssetsDailyMapper extends BaseMapper<TAccountAssetsDaily> {

}

//以下是使用insertList
List<TAccountAssetsDaily> list = incomeMapper.getAccountAssetsList(final_date);
if (!list.isEmpty()) {
    //根据日期先删后插
    Example example = new Example(TAccountAssetsDaily.class);
    example.createCriteria().andEqualTo("createDate", final_date);
    tAccountAssetsDailyMapper.deleteByExample(example);
    tAccountAssetsDailyMapper.insertList(list);
}

以上是tkMapper的普通版的批量插入

升级版分批插入

有些时候我们在插入数据库的时候数据量很大，会造成数据库慢查询、cpu飙高 ！~

为了处理这种情况，决定使用分批插入的情况。网上查了有几种实现方式，都不太满意。这里决定自己写一个通用的批量插入，让代码优雅起来 ~

import com.test.base.BaseMapper;

import java.util.ArrayList;
import java.util.List;

public class BatchInsertUtil {

    //静态分批插入方法
    public static <T> int insertList(List<T> dataList, Class mapperCls) {
        BaseMapper<T> baseMapper = (BaseMapper<T>) SpringContextUtils.getBean(mapperCls);
        List<T> list;
        //这里写死每次处理2000条，可以提出来做动态参数
        int batchSize = 2000;
        for (int i = 0; i < dataList.size(); i += batchSize) {
            int end = Math.min(dataList.size(), i + batchSize);
            list = dataList.subList(i, end);
            baseMapper.insertList(list);
        }
        return dataList.size();
    }

}

这里用到了SpringContextUtils 根据class获取到mapper的bean对象，在转换成BaseMapper来执行insertList分批插入

使用的时候就更简单了? 代码如下

List<TAccountAssetsDaily> list = incomeMapper.getAccountAssetsList(income_date);
if (!list.isEmpty()) {
    Example example = new Example(TAccountAssetsDaily.class);
    example.createCriteria().andEqualTo("createDate", income_date);
    tAccountAssetsDailyMapper.deleteByExample(example);
    //使用起来就这么简单
    BatchInsertUtil.insertList(list, TAccountAssetsDailyMapper.class);
}

以上就是tkMapper批量插入相关的处理办法，目前感觉是最优解也是最好用的方法 ~

SpringContextUtils类和普通的实现可能有点区别这里提供下代码

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.ConfigurableListableBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtils implements BeanFactoryPostProcessor, ApplicationContextAware {
    public static ApplicationContext applicationContext;

    private static ConfigurableListableBeanFactory beanFactory;

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException
    {
        SpringContextUtils.beanFactory = beanFactory;
    }


    @Override
    public void setApplicationContext(ApplicationContext applicationContext)
            throws BeansException {
        SpringContextUtils.applicationContext = applicationContext;
    }

    public static Object getBean(String name) {
        return applicationContext.getBean(name);
    }

    public static <T> T getBean(Class<T> requiredType) {
        return applicationContext.getBean(requiredType);
    }

    public static boolean containsBean(String name) {
        return applicationContext.containsBean(name);
    }

    public static boolean isSingleton(String name) {
        return applicationContext.isSingleton(name);
    }

    public static Class<? extends Object> getType(String name) {
        return applicationContext.getType(name);
    }

    /// 获取当前环境
    public static String getActiveProfile() {
        return applicationContext.getEnvironment().getActiveProfiles()[0];
    }
}