mybatis怎么样批量插入大量数据

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数据库 在使用mybatis插入大量数据的时候,为了提高效率,放弃循环插入,改为批量插入,mapper如下:

package com.lcy.service.mapper;import com.lcy.service.pojo.TestVO;import org.apache.ibatis.annotations.Insert;import java.util.List;public interface TestMapper {    @Insert("")    Integer testBatchInsert(List list);}

实体类:

package com.lcy.service.pojo;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;@Data@NoArgsConstructor@AllArgsConstructorpublic class TestVO {    private String t1;    private String t2;    private String t3;    private String t4;    private String t5;}

测试类如下:

import com.lcy.service.TestApplication;import com.lcy.service.mapper.TestMapper;import com.lcy.service.pojo.TestVO;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import java.util.ArrayList;import java.util.List;@SpringBootTest(classes = TestApplication.class)@RunWith(SpringRunner.class)public class TestDemo {    @Autowired    private TestMapper testMapper;    @Test    public void insert() {        List list = new ArrayList<>();        for (int i = 0; i < 200000; i++) {            list.add(new TestVO(i + "," + i, i + "," + i, i + "," + i, i + "," + i, i + "," + i));        }        System.out.println(testMapper.testBatchInsert(list));    }}

为了复现bug,我限制了JVM内存:

执行测试类报错如下:

java.lang.OutOfMemoryError: Java heap space

at java.base/java.util.Arrays.copyOf(Arrays.java:3746)

可以看到,Arrays在申请内存的时候,导致栈内存溢出

改进方法,分批新增:

import com.lcy.service.TestApplication;import com.lcy.service.mapper.TestMapper;import com.lcy.service.pojo.TestVO;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import javax.swing.*;import java.util.ArrayList;import java.util.List;import java.util.stream.Collectors;@SpringBootTest(classes = TestApplication.class)@RunWith(SpringRunner.class)public class TestDemo {    @Autowired    private TestMapper testMapper;    @Test    public void insert() {        List list = new ArrayList<>();        for (int i = 0; i < 200000; i++) {            list.add(new TestVO(i + "," + i, i + "," + i, i + "," + i, i + "," + i, i + "," + i));        }        int index = list.size() / 10000;        for (int i=0;i< index;i++){            //stream流表达式，skip表示跳过前i*10000条记录，limit表示读取当前流的前10000条记录            testMapper.testBatchInsert(list.stream().skip(i*10000).limit(10000).collect(Collectors.toList()));        }    }}

还有一种方法是调高JVM内存,不过不建议使用,不仅吃内存,而且数据量过大会导致sql过长报错

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