jsp中对数据库的操作，删除，更改，查询成功了，可插入不成功

Question

在网上查的程序，其他的对数据库删改差都能运行，只有插入数据数据库没有反应

<%@ page import="java.util.*,entity.*,Dao.*" pageEncoding="UTF-8"%>

<%

request.setCharacterEncoding("UTF-8");  
String user_name=request.getParameter("user_name");  
String user_sex=request.getParameter("user_sex");  
String user_age=request.getParameter("user_age");  
//getParameterValues可以获取name对应的一组value(如果name下有多个value被提交的话)  
String[] s1=request.getParameterValues("user_hobby");  
StringBuffer user_hobby=new StringBuffer();  
for(int i=0;s1!=null&&i<s1.length;i++){  
  user_hobby.append(s1[i]);  
  if(i<s1.length-1){  
   user_hobby.append(",");  
  }  
}  
String[] s2=request.getParameterValues("user_city");  
StringBuffer user_city=new StringBuffer();  
for(int i=0;s2!=null&&i<s2.length;i++){  
    user_city.append(s2[i]);  
    if(i<s2.length-1){  
        user_city.append(",");  
    }  
}  
String mtext=request.getParameter("mtext");  
UserInfo obj=new UserInfo();  
obj.setUser_name(user_name);  
obj.setUser_sex(user_sex);  
obj.setUser_age(Integer.parseInt(user_age));  
obj.setUser_hobby(user_hobby.toString());  
obj.setUser_city(user_city.toString());  
obj.setMtext(mtext);  

UserInfoDao dao=new UserInfoDao();  
dao.save(obj);  


response.sendRedirect("index1.jsp");  

%>

Answer 1

把插入的逻辑代码贴出来吧