develog

public void testProps() throws Exception { Properties props = new Properties(); props.load(new FileInputStream("src/db.properties")); Set set = props.keySet(); Iterator iter = set.iterator(); while (iter.hasNext()) { String key = (String) iter.next(); System.out.println(key + " : " + props.getProperty(key)); }}

SELECT UT.TABLE_NAME , UT.NUM_ROWS , TO_CHAR(UT.NUM_ROWS, '999,999,999') NUM_ROWS2 , US.SEGMENT_TYPE , US.SEGMENT_NAME , US.BYTES , US.BYTES / 1024 KB , US.BYTES / 1024 / 1024 MB , US.BYTES / 1024 / 1024 / 1024 GB FROM USER_TABLES UT, USER_SEGMENTS US WHERE US.SEGMENT_TYPE = 'TABLE' AND UT.TABLE_NAME = US.SEGMENT_NAME ORDER BY GB DESC ;

String str = null;System.out.println((String) str); // 'null' text returnSystem.out.println(String.valueOf(str)); // 'null' text returnSystem.out.println(str.toString()); // NullPointException

http://commons.apache.org/proper/commons-dbcp/configuration.html

날짜 내림차순, ls -lt날짜 오름차순, ls -ltr

[dev@dev02 logs]$ alias llalias ll='ls -l --color=tty' [dev@dev02 logs]$ alias ll='ls -lt --color=tty' [dev@dev02 logs]$ alias llalias ll='ls -lt --color=tty'