如何使用Java（JSP）将单独选择的日期插入mysql

Question

In my project I want to save date which is read separately as day,month,year by using a select box. The code used is

<%
     String value=null;
     String[] h=null;
      h=request.getParameterValues("qns[]");
     String expert=request.getParameter("expert");
     int sday=Integer.parseInt(request.getParameter("sday"));
     int smonth=Integer.parseInt(request.getParameter("smonth"));
     int syear=Integer.parseInt(request.getParameter("syear"));
     int eday=Integer.parseInt(request.getParameter("eday"));
     int emonth=Integer.parseInt(request.getParameter("emonth"));
     int eyear=Integer.parseInt(request.getParameter("eyear"));
     String start=syear+"-"+smonth+"-"+sday;
     String end=eyear+"-"+emonth+"-"+eday;    
   for(int i=0;i<h.length;i++)
      {
          s.savetask(h[1],expert,start,end);
      }
   %>

The savetask function is

  public int savetask(String qnid,String userid,String start,String end)
  {
     int n=0;
     try{

         String sql="insert into task(user_id,question_id,start_date,end_date,status)values('"+qnid+"','"+userid+"','"+start+"','"+end+"',0";
         n = db.modifyingQueries(sql);
     }
     catch(Exception e){

     }
     return n;
 }

But it is not inserting values to the table task The table format for task is

task_id      int (Auto increment)
user_id      int
question_id  int
start_date   date 
end_date     date
status       int

Answer 1

First of all, Your sql line is invalid.Missing bracket in the end.

   String sql="insert into task(user_id,question_id,start_date,end_date,status)values
                            ('"+qnid+"','"+userid+"','"+start+"','"+end+"',0");
                                                                            ^

one more syntax error is there is no need for " after the 0 in the end since it is an int (realized after you updated the column structure).

Still if you face further exceptions,provide the stack trace.

Update(comment that helpful to resolve the issue):

What you have to do is after the line String sql = ... ,Put System.out.println(sql) So it prints the query in console.Pick that line and fire it on your Data base query manager.And see for any syntax errors.