线程池:1.出现版本:JDK1.52.包:java.util.concurrent3.Executors类 -->工厂类1.三个静态方法:static ExecutorService newCachedThreadPool() 创建新的线程池对象Creates a thread pool that creates new threads as needed, …
/*** author Alina* date 2021年12月26日 1:48 上午*/
public class SingleLanhan {private SingleLanhan() { }private static SingleLanhan s null;public static SingleLanhan getInstance(){if (s null){synchronized (SingleLanhan.class){if (s null){s new SingleL…
With the following query, we can get a list of column names and datatype of a table in PostgreSQL.解决方案SELECTa.attname as "Column",pg_catalog.format_type(a.atttypid, a.atttypmod) as "Datatype"FROMpg_catalog.pg_attribute aWHEREa.attnu…