专题文章
时长:00:00更新时间:2020-11-09 16:31:45
java-向mysql数据库中插入数据时报错:mysqljavaweb public class categorydao { public static void save(category c) throws SQLException{ Connection conn=(Connection) DB.getConnection(); String sql=null; if(c.getId()==-1){ sql=insert into category values(null,); }else
查看详情