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
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..
public static Writer makeOrcWriter(String path, Class clazz) throws IOException { FileUtils.delete(path); Configuration conf = new Configuration(false); FileSystem fs = FileSystem.get(conf); return OrcFile.createWriter(new Path(path), OrcFile.writerOptions(conf) .inspector(ObjectInspectorFactory.getReflectionObjectInspector(clazz, ObjectInspectorFactory.ObjectInspectorOptions.JAVA)) .fileSystem(..
public static List files(String dirname) { if (dirname == null) { return Collections.emptyList(); } File dir = new File(dirname); if (!dir.exists()) { return Collections.emptyList(); } if (!dir.isDirectory()) { return Collections.singletonList(file(dirname)); } return Arrays.stream(Objects.requireNonNull(dir.listFiles())) .collect(Collectors.toList()); } https://stackoverflow.com/questions/18446..
https://stackoverflow.com/questions/2674554/how-do-you-know-a-variable-type-in-java How do you know a variable type in java? Let's say I declare a variable: String a = "test"; And I want to know what type it is, i.e., the output should be java.lang.String How do I do this? stackoverflow.com
https://stackoverflow.com/questions/13357760/mysql-create-user-if-not-exists mysql create user if not exists I have a query to check mysql users list for create new user. IF (SELECT EXISTS(SELECT 1 FROM `mysql`.`user` WHERE `user` = '{{ title }}')) = 0 THEN CREATE USER '{{ title }}'@'localhost' IDENT... stackoverflow.com
https://stackoverflow.com/questions/35592034/how-do-i-add-database-name-with-hyphen-character-using-script-in-ubuntu/35592181 how do i add database name with hyphen character using script in ubuntu I've tried using this code in a script but it just created what is inside the backtick. In this example, "echo "table-db"" was created in the database. It didn't create the name of the folder with .....
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