개발잡부

local 에서 개발을 하다보면 포트번호가 충돌나서 아래와 같은 에러가 발생한다. springboot 의 embedded tomcat 을 사용하고 있었는데 brew 를 통해서 하둡을 설치하다 톰켓이 설치되어 에러가 발생 *************************** APPLICATION FAILED TO START *************************** Description: Web server failed to start. Port 9090 was already in use. Action: Identify and stop the process that's listening on port 9090 or configure this application to listen on another p..

push(E item) 해당 item을 Stack의 top에 삽입 Vector의 addElement(item)과 동일 pop() Stack의 top에 있는 item을 삭제하고 해당 item을 반환 peek() Stack의 top에 있는 item을 삭제하지않고 해당 item을 반환 empty() Stack이 비어있으면 true를 반환 그렇지않으면 false를 반환 search(Object o) 해당 Object의 위치를 반환

https://spark.apache.org/docs/latest/sql-data-sources-load-save-functions.html Generic Load/Save Functions - Spark 3.2.1 Documentation spark.apache.org JSON File 읽기 Dataset peopleDF = spark.read().format("json").load("examples/src/main/resources/people.json"); peopleDF.select("name", "age").write().format("parquet").save("namesAndAges.parquet"); CSV File 읽기 Dataset peopleDFCsv = spark.read().for..

https://sparkbyexamples.com/spark/install-apache-spark-on-mac/ Install Apache Spark Latest Version on Mac - Spark by {Examples} Five easy steps to install the latest version of Apache Spark on Mac (macOS) – In recent days Apache Spark installation on Mac OS has become very easy using Homebrew. You can install it and start running examples in just 5 mins. There are multiple ways t sparkbyexamples..

//스트림 생성 //컬렉션 List list = Arrays.asList("a", "b", "c"); Stream stream = list.stream(); //배열 String[] array = new String[]{"a","b","c"}; Stream stream1 = Arrays.stream(array); Stream stream2 = Arrays.stream(array, 1, 3); //정적메소드 Arrays.stream() 에 인자를 입력 //인덱스 1 포함, 3제외 //빌더 Stream stream3 = Stream.builder().add("a").add("b").build(); //Generator Stream stream4 = Stream.generate(()->"a").limit(3)..

우선 if 문 select * from tbl_board where title = '%'||#{title}||'%' OR content = '%'||#{content}||'%' and or 조건문 switch case -- doo 인 경우 재고수량 , iisales.remain_cnt -- 재고수량 , (SELECT remain_cnt FROM itm_item_sales WHERE item_no = ii .item_no AND if (iiss.stock_allot_type = 'ALL' iiss. online_stock_yn ='Y' iiss. online_stock_start_dt now() now() iiss. online_stock_end_dt , store_id ='99998' , store_id..

11:14:56 ### Error querying database. Cause: java.sql.SQLException: Error retrieving record: Unexpected Exception: java.io.EOFException message given: Can not read response from server. Expected to read 475 bytes, read 463 bytes before connection was unexpectedly lost. #autoReconnectForPools 옵션 autoReconnectForPools=true url: jdbc:mysql://{host}:{port}/{DB}?useUnicode=true&useCursorFetch=true&ch..

package com.bbongdoo.doo.keyword; import com.bbongdoo.doo.domain.Keywords; import com.bbongdoo.doo.domain.KeywordsRepository; import com.bbongdoo.doo.service.KeywordsService; import org.assertj.core.api.Assertions; import org.junit.jupiter.api.BeforeEach; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context..

Annotation package com.bbongdoo.doo.annotation; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Target({ElementType.TYPE, ElementType.METHOD}) @Retention(RetentionPolicy.RUNTIME) public @interface Timer { } Aspect package com.bbongdoo.doo.aspect; import org.aspectj.lang.ProceedingJoi..

한개의 컬럼에 UNIQUE 설정 @Column(name="column" , unique=true) long column 두 개 이상 컬럼을 묶어 UNIQUE 설정 @Table 속성 uniqueConstraints 사용 @Entity @Table( name="keywords", uniqueConstraints={ @UniqueConstraint( name={"contstraintName"} columnNames={"keyword", "use_yn"} ) } ) @Data public class Entity{ @Column(name="keyword") String keyword; @Column(name="use_yn") String use_yn; } http://iryan.kr/t7eogjtthy 농심 먹태..