Java中验证 Mybatis 数据分片可以减轻GC压力的操作方法

@SpringBootTest(classes = KetchupApplication.class)
class GcSpec extends Specification {
    @Resource
    FileOutputRecordMapper mapper
	/**
     * 十万条数据库查询
     */
    Long startId = 1;
    Long endId = 100000;	
    /**
     * 生成十万条数据，测试用例执行完后删除
     */
    def setup() {
        def allIds = (startId..endId).toList()
        Lists.partition(allIds, 1000).forEach { subIds ->
            def sub = subIds.collect(it -> createPO(it))
            mapper.batchInsertWithId(sub);
        }
    }
    def cleanup() {
        mapper.deleteByIdRang(startId, endId)
    }
}

    def "分片查询" () {
    	given:
        when:
        then:
    }

    def "分片查询" () {
        when:
        then:
    }

    def "分片查询" () {
    	given:
        expect:
    }

def rang = (startId .. endId)

def list = [1,2,3]

// 生成一个list，内部的元素是从1 到 100000的数值类型
def allIds = (1 .. 100000).toList()

// 以下的 collect 写法比Java简洁很多
def sub = subIds.collect(it -> createPO(it))
// 等价于 Java 的写法
List<FileOutputRecordPO> poList = subIds.stream().map(it -> createPO(it)).collect(Collectors.toList())

Lists.partition(allIds, 1000).forEach...

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>30.1-jre</version>
        </dependency>