強烈推薦MyBatis 三種批次插入方式的比較

<insert id="insertByBatch" parameterType="java.util.List">
    INSERT INTO tb_item VALUES
    <foreach collection="list" item="item" index="index" separator=",">
        (newId(),#{item.uniqueCode},#{item.projectId},#{item.name},#{item.type},#{item.packageUnique},
        #{item.isPackage},#{item.factoryId},#{item.projectName},#{item.spec},#{item.length},#{item.weight},
        #{item.material},#{item.setupPosition},#{item.areaPosition},#{item.bottomHeight},#{item.topHeight},
        #{item.serialNumber},#{item.createTime}</foreach>
</insert>
Mapper介面Mapper 是 mybatis外掛tk.Mapper 的介面，與本文內容關係不大

public interface ItemMapper extends Mapper<Item> {
    int insertByBatch(List<Item> itemList);
}

@Service
public class ItemService {
    @Autowired
    private ItemMapper itemMapper;
    @Autowired
    private SqlSessionFactory sqlSessionFactory;
    //批次處理
    @Transactional
    public void add(List<Item> itemList) {
        SqlSession session = sqlSessionFactory.openSession(ExecutorType.BATCH,false);
        ItemMapper mapper = session.getMapper(ItemMapper.class);
        for (int i = 0; i < itemList.size(); i++) {
            mapper.insertSelective(itemList.get(i));
            if(i%1000==999){//每1000條提交一次防止記憶體溢位
                session.commit();
                session.clearCache();
            }
        }
        session.commit();
        session.clearCache();
    }
    //拼接sql
    @Transactional
    public void add1(List<Item> itemList) {
        itemList.insertByBatch(itemMapper::insertSelective);
    }
    //迴圈插入
    @Transactional
    public void add2(List<Item> itemList) {
        itemList.forEach(itemMapper::insertSelective);
    }
}

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT, classes = ApplicationBoot.class)
public class ItemServiceTest {
    @Autowired
    ItemService itemService;

    private List<Item> itemList = new ArrayList<>();
    //生成測試List
    @Before 
    public void createList(){
        String json ="{n" +
                "        "areaPosition": "TEST",n" +
                "        "bottomHeight": 5,n" +
                "        "factoryId": "0",n" +
                "        "length": 233.233,n" +
                "        "material": "Q345B",n" +
                "        "name": "TEST",n" +
                "        "package": false,n" +
                "        "packageUnique": "45f8a0ba0bf048839df85f32ebe5bb81",n" +
                "        "projectId": "094b5eb5e0384bb1aaa822880a428b6d",n" +
                "        "projectName": "專案_TEST1",n" +
                "        "serialNumber": "1/2",n" +
                "        "setupPosition": "1B柱",n" +
                "        "spec": "200X200X200",n" +
                "        "topHeight": 10,n" +
                "        "type": "Steel",n" +
                "        "uniqueCode": "12344312",n" +
                "        "weight": 100n" +
                "    }";
        Item test1 = JSON.parseObject(json,Item.class);
        test1.setCreateTime(new Date());
        for (int i = 0; i < 1000; i++) {//測試會修改此數量
            itemList.add(test1);
        }
    }
     //批次處理
    @Test
    @Transactional
    public void tesInsert() {
        itemService.add(itemList);
    }
    //拼接字串
    @Test
    @Transactional
    public void testInsert1(){
        itemService.add1(itemList);
    }
    //迴圈插入
    @Test
    @Transactional
    public void testInsert2(){
        itemService.add2(itemList);
    }
}

@Transactional
public void add1(List<Item> itemList) {
    itemList.forEach(itemMapper::insertSelective);
}