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這篇文章給大家分享的是有關(guān)mybatis批量插入10萬條數(shù)據(jù)的示例分析的內(nèi)容。小編覺得挺實(shí)用的,因此分享給大家做個(gè)參考,一起跟隨小編過來看看吧。
數(shù)據(jù)庫 在使用mybatis插入大量數(shù)據(jù)的時(shí)候,為了提高效率,放棄循環(huán)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(shí)體類:
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; }
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(fù)現(xiàn)bug,我限制了JVM內(nèi)存:
執(zhí)行測試類報(bào)錯(cuò)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(nèi)存的時(shí)候,導(dǎo)致棧內(nèi)存溢出
改進(jìn)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(dá)式,skip表示跳過前i*10000條記錄,limit表示讀取當(dāng)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(diào)高JVM內(nèi)存,不過不建議使用,不僅吃內(nèi)存,而且數(shù)據(jù)量過大會(huì)導(dǎo)致sql過長報(bào)錯(cuò)
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