數據庫 在使用mybatis插入大量數據的時候,為了提高效率,放棄循環插入,改為批量插入,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);}

實體類:

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;}

測試類如下:

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)); }}

為了復現bug,我限制了JVM內存:

執行測試類報錯如下:

java.lang.OutOfMemoryError: Java heap space

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

可以看到,Arrays在申請內存的時候,導致棧內存溢出

改進方法,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流表達式，skip表示跳過前i*10000條記錄，limit表示讀取當前流的前10000條記錄 testMapper.testBatchInsert(list.stream().skip(i*10000).limit(10000).collect(Collectors.toList()));} }}

還有一種方法是調高JVM內存,不過不建議使用,不僅吃內存,而且數據量過大會導致sql過長報錯

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