배우기를 멈추는 사람은 20세건 80세건 늙은 것이다.

public static void delete(String name) { AdminClient client = AdminClient.create(properties()); DeleteTopicsResult deleteTopicsResult = client.deleteTopics(Collections.singletonList(name)); while (!deleteTopicsResult.all().isDone()) { } } https://stackoverflow.com/questions/54140543/delete-topic-not-working-for-kafka-java-client-2-1-0/70729759#70729759 delete topic not working for kafka java cli..

https://stackoverflow.com/questions/90002/what-is-a-reasonable-code-coverage-for-unit-tests-and-why What is a reasonable code coverage % for unit tests (and why)? If you were to mandate a minimum percentage code-coverage for unit tests, perhaps even as a requirement for committing to a repository, what would it be? Please explain how you arrived at your ans... stackoverflow.com https://jamie95.t..

session.timeout.ms heartbeat.interval.ms max.poll.interval.ms max.poll.records enable.auto.commit auto.commit.interval.ms auto.offset.reset https://dev-jj.tistory.com/entry/Kafka-%EA%B0%99%EC%9D%80%EB%A9%94%EC%8B%9C%EC%A7%80%EB%A5%BC-%EB%B0%98%EB%B3%B5%EC%A0%81%EC%9C%BC%EB%A1%9C-%EC%86%8C%EB%B9%84%ED%96%88%EB%8D%98-%EB%A6%AC%EB%B0%B8%EB%9F%B0%EC%8B%B1-%EC%9D%B4%EC%8A%88-%ED%95%B4%EA%B2%B0-MAX-PO..

ResultSetMetaData metaData = resultSet.getMetaData(); int count = metaData.getColumnCount(); //number of column String columnName[] = new String[count]; for (int i = 1; i

@Profile("prd") // 운영시에만 사용하겠다. @Profile("!prd") // 운영이 아닌 모든곳에서 사용하겠다. @Profile({"local", "dev"}) // local과 dev phase에 사용하겠다. @Value("${spring.profiles.active}") private String activeProfile; @Value("${spring.profiles.active:}") private String activeProfile; String profile = System.getProperty("spring.profiles.active; https://oingdaddy.tistory.com/393 Springboot Profile 설정방법 및 가져오기 프로젝트를 진행 시 p..

public static void create(String name) { AdminClient client = AdminClient.create(properties()); NewTopic topic = new NewTopic( name, (int)conf().get("partition"), Short.parseShort(String.valueOf(conf().get("replication.factor")))); client.createTopics(Collections.singleton(topic)); client.close(); } https://stackoverflow.com/questions/64077406/why-is-adminclient-not-failing-when-creating-a-topic..

https://stackoverflow.com/questions/20414804/java-backslash-encode-special-characters-like-quote-tab-newline-backslash-to Java backslash encode special characters like quote, tab, newline, backslash to make parseable I'm writing Java that gets strings like "C:\Temp\file.txt" and generates C source code containing those strings, the code will be compiled later. So I need to render the strings in ..

### char - 고정길이 - 고정길이 필드 사용 ### varchar, varchar2 - 가변길이 - 길이가 몇인지 계산 (추가 연산 비용) https://kasckasc.tistory.com/entry/Oracle-CHAR-VARCHAR-VARCHAR2-%EC%B0%A8%EC%9D%B4 [Oracle] CHAR, VARCHAR, VARCHAR2 차이 데이터베이스 데이터 유형 및 CHAR와 VARCHAR 비교 데이터 유형은 데이터베이스의 테이블에 특정 자료를 입력할 때, 그 자료를 받아들일 공간을 자료의 유형별로 나누는 기준이다. 따라서 선언한 kasckasc.tistory.com https://mozi.tistory.com/229 [DBA] 데이터타입 CHAR 와 VARCHAR 중 어느것을 써야할..

@Profile(value = {"swagger"}) @Configuration @EnableSwagger2 public class SwaggerConfiguration { ... } import org.apache.commons.lang3.StringUtils; import org.springframework.context.annotation.Profile; import org.springframework.http.HttpStatus; import org.springframework.http.ResponseEntity; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMap..

brew install mysql mysql.server start http://meonggae.blogspot.com/2017/03/db-mac-mysql-1-error-2002-hy000-cant.html [db] mac에서 mysql환경설정 셋팅하기 1편 - 설치 및 접속, ERROR 2002 (HY000) : Can't connect to local MySQL server db, mysql, error2002 meonggae.blogspot.com

DatabaseMetaData dbm = con.getMetaData(); // check if "employee" table is there ResultSet tables = dbm.getTables(null, null, "employee", null); if (tables.next()) { // Table exists } else { // Table does not exist } https://stackoverflow.com/questions/2942788/check-if-table-exists Check if table exists I have a desktop application with a database embedded in it. When I execute my program I need ..

ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2"); ResultSetMetaData rsmd = rs.getMetaData(); String name = rsmd.getColumnName(1); https://stackoverflow.com/questions/696782/retrieve-column-names-from-java-sql-resultset Retrieve column names from java.sql.ResultSet With java.sql.ResultSet is there a way to get a column's name as a String by using the column's index? I had a look thr..

https://stackoverflow.com/questions/26544091/checking-if-type-list-in-python Checking if type == list in python I may be having a brain fart here, but I really can't figure out what's wrong with my code: for key in tmpDict: print type(tmpDict[key]) time.sleep(1) if(type(tmpDict[key])==list): ... stackoverflow.com https://stackoverflow.com/questions/25231989/how-to-check-if-a-variable-is-a-dictio..

https://www.w3schools.com/sql/sql_datatypes.asp SQL Data Types for MySQL, SQL Server, and MS Access W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. www.w3schools.com

https://kim-jong-hyun.tistory.com/32 [JAVA] - JSON 데이터(object, array)를 다뤄보기 2장에서는 JAVA에서 JSON 데이터로 HTTP 통신을 해보는 시간을 가졌는데 이번에는 직접 JSON 데이터를 다뤄보는 시간을 가져보자 JSON 데이터를 다루기 위한 라이브러리와 HTTP통신하는 예제는 아래링 kim-jong-hyun.tistory.com

package util; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Map; import java.util.Random; public class RandomUtils { private static class SHA256 { public static String encrypt(String text) { MessageDigest md = null; try { md = MessageDigest.getInstance("SHA-256"); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } md.update(text.ge..

CREATE USER IF NOT EXISTS 'akm'@'localhost' IDENTIFIED BY 'akm' PASSWORD EXPIRE NEVER; GRANT ALL PRIVILEGES ON akm.* TO 'akm'@'localhost'; FLUSH PRIVILEGES; https://www.lesstif.com/dbms/mysql-24445981.html MySQL 데이타베이스와 사용자 계정 생성하기 설치후 최초 root 암호를 변경할 경우 아래 구문 사용 www.lesstif.com

import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class SHA256 { public String encrypt(String text) throws NoSuchAlgorithmException { MessageDigest md = MessageDigest.getInstance("SHA-256"); md.update(text.getBytes()); return bytesToHex(md.digest()); } private String bytesToHex(byte[] bytes) { StringBuilder builder = new StringBuilder(); for (byte b : byte..

URL sqlScriptUrl = MyServletContextListener.class .getClassLoader().getResource("sql/script.sql"); https://stackoverflow.com/questions/19414453/how-to-get-resources-directory-path-programmatically How to get resources directory path programmatically I have the following directory layout: src main java resources sql (scripts for database) spring (configuration) webapp Within a ServletContextListe..