qw160的博客

错误描述 如果下面两种查询弄错了就会出现错误： Unknown column ‘xxx’ in ‘where clause mysql查询的关键字是字符串 变量 sql = "select * from stu where major='"+major+"'"; // 设置sql语句 普通字符串 sql = "select * from stu where major='字符'" mysql查询的关键字为int sql = "select * from stu where major=

好久没这么写查询，写了几行忘词了,so再记录一下 doget,dopost别反了 package tt.webhomework; import javax.servlet.*; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servl