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;/*** 功能描述：** @author liuchaoyong* @version 1.0* @date 2019-06-26 13:18*/ public interface TestMapper {@Insert("<script>" +"insert into test (t1,t2,t3,t4,t5) values " +"<foreach collection='list' item='obj' separator=','>" +"(#{obj.t1},#{obj.t2},#{obj.t3},#{obj.t4},#{obj.t5})" +"</foreach>" +"</script>")Integer testBatchInsert(List<TestVO> list);}

實體類:

package com.lcy.service.pojo;import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor;/*** 功能描述：** @author liuchaoyong* @version 1.0* @date 2019-06-26 13:20*/ @Data @NoArgsConstructor @AllArgsConstructor public 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;/*** 功能描述：** @author liuchaoyong* @version 1.0* @date 2019-05-17 16:42*/ @SpringBootTest(classes = TestApplication.class) @RunWith(SpringRunner.class) public class TestDemo {@Autowiredprivate TestMapper testMapper;@Testpublic void insert() {List<TestVO> 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 spaceat 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;/*** 功能描述：** @author liuchaoyong* @version 1.0* @date 2019-05-17 16:42*/ @SpringBootTest(classes = TestApplication.class) @RunWith(SpringRunner.class) public class TestDemo {@Autowiredprivate TestMapper testMapper;@Testpublic void insert() {List<TestVO> 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()));}}}

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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