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:
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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:
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package com.lcy.service.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @NoArgsConstructor @AllArgsConstructor public class TestVO { private String t1; private String t2; private String t3; private String t4; private String t5; } |
测试类如下:
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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:
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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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原文链接:https://blog.csdn.net/weixin_39841589/article/details/93740276