mysql 系统表的作用

mysql 的系统表记录了所有数据库表（包括视图的定义语句）的字段列，顺序，类型等等，知道这些的话可以做些抽取模板淫荡的操作吧 嘿嘿 

public void shuaxinglb() {
		try {
			PrintWriter out = ServletActionContext.getResponse().getWriter();
			eqmsService.saveOrupdateBySql("delete from glb", null);
			List<User> users = eqmsService.findAll("from User", null);
			eqmsService
					.saveOrupdateBySql(
							"INSERT INTO `glb` (`biaoming`, `lieming`, `leixing`, `zwm`,`shunxu`,`display`) select TABLE_NAME,COLUMN_NAME,data_type ,COLUMN_COMMENT,ordinal_position,1 from information_schema.columns where table_schema='tzerp_db';",
							null);
			for (User user : users) {
				eqmsService
						.saveOrupdateBySql(
								"INSERT INTO `user_glb` (user_id,`biaoming`, `lieming`, `leixing`,`zwm`,`shunxu`,`display`) select ?,`biaoming`, `lieming`, `leixing`, `zwm`,`shunxu`,`display` from glb g where lieming not in(select lieming from user_glb where biaoming=g.biaoming and user_id=? );",
								new Object[] { user.getUserId(), user.getUserId()});
			}
				
			eqmsService.saveOrupdateBySql("delete from user_glb  where user_glb.lieming not in(select glb.lieming from glb where glb.biaoming=user_glb.biaoming);", null);
			eqmsService.saveOrupdateBySql(
					"update  user_glb set zwm=lieming where zwm ='';", null);
			out.print("aaa");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}