说明：  tomcat数据库连接池设置 若用eclipse跟踪bug，设置连接数据库则须在“Java构建路径”－“库”里添加上 数据库驱动程序的JAR文件即可。
(tomcat database connection pool settings with the eclipse track bug set to connect to the database shall be added in the " Java Build Path" - " Library database driver JAR file.)