text: INSERT INTO webexp.CLASS (CLASSID, CLASSNAME, REGTIME, SPECIALTY, REMARK) VALUES ('J01', 'C语言程序设计', '2021-06-29 12:27:21', '计算机', null);
  INSERT INTO webexp.CLASS (CLASSID, CLASSNAME, REGTIME, SPECIALTY, REMARK) VALUES ('J02', '数据结构', '2021-06-29 12:28:48', '计算机', null);
  INSERT INTO webexp.CLASS (CLASSID, CLASSNAME, REGTIME, SPECIALTY, REMARK) VALUES ('J03', '网络程序设计', '2021-06-29 12:28:48', '计算机', null);
  INSERT INTO webexp.CLASS (CLASSID, CLASSNAME, REGTIME, SPECIALTY, REMARK) VALUES ('J04', '.NET程序设计', '2021-06-29 12:28:48', '计算机', null);