How to receive parameters from a form and insert values in db using servlet

Hi friends,
My first question here.
I'm trying to create a Servlet that takes input from a form and process it and insert it in database.tablename.
My MAIN ISSUE IS WITH THE NUMBER OF COLUMNS THAT WOULD BE DYNAMIC AND THUS CANT RECEIVE THE PARAMETERS IN STATIC CODE.
Here is the form code
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<form action="Test" method="post" />
<table width="90%" border="1" cellspacing="1" cellpadding="1">
<tr>
<th scope="col">Student Name</th>
<th scope="col">RollNo</th>
<th scope="col">Java</th>
<th scope="col">J2ee</th>
</tr>
<tr>
<td><input type="text" name="studentname" /></td>
<td><input type="text" name="rollno" /></td>
<td><input type="text" name="java" /></td>
<td><input type="text" name="j2ee" /></td>
</tr>
<tr>
<td><input type="text" name="studentname" /></td>
<td><input type="text" name="rollno" /></td>
<td><input type="text" name="java" /></td>
<td><input type="text" name="j2ee" /></td>
</tr>
<tr>
<td><input type="text" name="studentname" /></td>
<td><input type="text" name="rollno" /></td>
<td><input type="text" name="java" /></td>
<td><input type="text" name="j2ee" /></td>
</tr>
</table>
<input type ="submit" value="insert values in the database now"/>
</form>
</html>
And here is the Servlet
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.io.*;
public class Test extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "Module: Process Result Values from previous page";
out.println("<html>\n" +
"<head><title>" + title + "</title></head>\n" +
"<body>");
          try
               Class.forName("com.mysql.jdbc.Driver");
               Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/","root", "root");
               Statement s = con.createStatement();
ResultSet res = s.executeQuery("SELECT * FROM dbname.tablename");
ResultSetMetaData rmeta=res.getMetaData();
int noofcolumns=rmeta.getColumnCount();
               if(!con.isClosed())
          catch(Exception e)
System.out.println("Exception"+e);
out.println(e);
if(connectionFlag==1)
out.println("</body></html>");
doGet(request, response);
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
This is the basic code structure and I'm trying to figure out this special case with handling the multiple parameters:
1. I dont' want to use String []a=request.getParameterValues("studentname"); as hard code. The reason being the number of rows will be diyamic and I would like to get the column name and then then use an array of string to take values. But how can I connect these to form a query so that the rows goes on inserted one after other.
Thanks,
Mashall

Thank you for your help.
I'm something close to it but this segment of code throws a NullPointerException Error. I counted number of rows and columns using the methods getColumnCount() and getColumnName(i).
ResultSetMetaData md = res.getMetaData(); //Get meta data for the resultset
int noofcolumns=md.getColumnCount();
out.println("<br />Number of columns in table (including name and roll number) :::: "+noofcolumns+"<br />");
for(int i=1;i<=noofcolumns;i++) // access column 1....n
String columnname = md.getColumnName(i); // get name of column 1....n
out.println("<br />Current column name ::: "+columnname+"<br />"); //check if the name appear correct.
String []columndata = request.getParameterValues(columnname); //Get raw value in array
for(int j=1;j<=rows;j++) // here rows is number of rows in each column
out.println("To be inserted: <b>"+columndata[j]+"</b> in Row ::: "+j+"<br />");
//The line above thows null pointer exception.
}

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The result shown is:
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I would like to know if i want to get back the parameters from the form ,
is that i must use Enumeration.
Because i have tried request.getParameter() to get the value of radio button, textbox, checkbox and select menu, but it get the null values.
Also, the function of Enumeration does not get the values of parameter in sequence as html form. e.g.In the html file, the first parameters should be textbox,but it displays the radio button's values first.
How to solve the problem .
Thanks

This sounds like a bug in the smart upload code. I have used this stuff before, but it's probably an older version, so maybe they broke something. Enumerations aren't usually guaranteed to keep things in any particular order. I would say for now, make a method to take the enumeration and a param name to find the value. And write to the JSPSmart people.

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Looking at the examples bundled with BlazeDS they have a jsp example that returns an XML result to FLEX so that part is fine. I am trying to find an example of JSP (or Servlet) that is able to read the XML data from FLEX and write it into a temp XML file. I would then try to use runtime.exec to invoke a local C++ program to process the XML file the result of which will be sent back to FLEX.
Any help will be very much appreciated!

<div class=Section1><br /><br /><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";<br />color:#1F497D'>I’d avoid calling an executable just to process XML –your<br />application server would provide enough support for reading and writing XML, no?<br />Also, if you’re only planning on working with XML then even BlazeDS might<br />be overkill because its focus is on sending strongly typed ActionScript data efficiently<br />to and from a client (it’s true that it does have a proxy service, but<br />that is not involved with processing the actual XML data).<o:p></o:p></span></p><br /><br /><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";<br />color:#1F497D'><o:p> </o:p></span></p><br /><br /><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";<br />color:#1F497D'>How complex is your XML? Do you need to resolve ids and<br />references or can you parse it top down in a single pass? There are several<br />well known libraries in Java for dealing with XML – the choice depends on<br />how you need to interact with the XML. Most of them take an InputStream as a<br />source for reading XML and you can get the InputStream from the servlet<br />request. Googling should turn up numerous examples.<o:p></o:p></span></p><br /><br /><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";<br />color:#1F497D'><o:p> </o:p></span></p><br /><br /><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";<br />color:#1F497D'>Pete<o:p></o:p></span></p><br /><br /><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";<br />color:#1F497D'><o:p> </o:p></span></p><br /><br /><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";<br />color:#1F497D'><o:p> </o:p></span></p><br /><br /><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><br /><br /><div><br /><br /><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><br /><br /><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span<br />style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> khwong<br />[mailto:[email protected]] <br><br /><b>Sent:</b> Sunday, September 28, 2008 12:09 PM<br><br /><b>To:</b> [email protected]<br><br /><b>Subject:</b> How to receive XML from Flex HTTP POST<o:p></o:p></span></p><br /><br /></div><br /><br /></div><br /><br /><p class=MsoNormal><o:p> </o:p></p><br /><br /><p class=MsoNormal style='margin-bottom:12.0pt'>A new discussion was started by<br />khwong in <br><br /><br><br /><b>General Discussion</b> --<br><br /> How to receive XML from Flex HTTP POST<br><br /><br><br />Hi, <br><br /><br><br />We curreontly have a setup where we have a FLEX frontend send an XML through a<br />HTTP POST and awaiting a response also in XML. On the backend this is handled<br />relatively simply by a PHP script that basically does the following: <br><br /><br><br />read data (in XML)from FlEX HTTP POST into a new temp XML file. <br><br />execute a c++ program with the XML file as one of the parameter. <br><br />return the result to FLEX <br><br /><br><br />We have decided to move to BlazeDS for various reasons. <br><br /><br><br />Looking at the examples bundled with BlazeDS they have a jsp example that<br />returns an XML result to FLEX so that part is fine. I am trying to find an<br />example of JSP (or Servlet) that is able to read the XML data from FLEX and<br />write it into a temp XML file. I would then try to use runtime.exec to invoke a<br />local C++ program to process the XML file the result of which will be sent back<br />to FLEX. <br><br /><br><br />Any help will be very much appreciated! <o:p></o:p></p><br /><br /><div class=MsoNormal><br /><br /><hr size=2 width=200 style='width:150.0pt' align=left><br /><br /></div><br /><br /><p class=MsoNormal style='margin-bottom:12.0pt'>View/reply at <a<br />href="http://www.adobeforums.com/webx?13@@.59b69b23">How to receive XML from<br />Flex HTTP POST</a><br><br />Replies by email are OK.<br><br />Use the <a<br />href="http://www.adobeforums.com/webx?280@@.59b69b23!folder=.3c061a83">unsubscribe</a>< br />form to cancel your email subscription.<o:p></o:p></p><br /><br /></div><br /><br /></div>

Variables to a BI Query from input form and chart?

Hi,
I have a query (QUERY A) to which I connected an input form to define the variables. The output is a chart which tells us a status overview.
Now I want to use the input form as well for entering the variables for QUERY B. This is no problem as the variables are passed through correctly. However, I also wanna filter on status by selecting the status in the chart. This does not work unfortunately.
Situation:
INPUT FORM ----------> QUERY A ---------------> CHART----------------------------
                                  |                                             |
                                  |                                             |
                                  |                                             |
                                  ----->QUERY B <--------------------------------
                                              |
                                              |
                                              ----------->OUTPUT (VARIABLES FROM INPUT FORM AND CHART}
Is this possible at all?
Best regards,
Jan Laros

Hi Jan,
I suspect that you are only partially passing the variables in two separate select events. You should be able to meet your requirement with the following approach:
1) Connect a select event from the output port of the form to the input/variable port of Query B. In the input parameters reference both the relevant form fields AND the chart fields you want to filter by;
2) Connect a select event from the output port of the chart to the input/variable port of Query B. In the input parameters reference both the relevant form fields AND the chart fields you want to filter by;
In other words, each select event link should reference the same fields from both the form and the chart.
Regards,
Mustafa.

How to pass data from offline form to webdynpro java

Hi,
Please suggest me how to pass data from offline from to webdynpro java node?
i am using the below code to pass data from offline form(after entering values in the form) to node . i am using form upload ui element to upload offline form and after that i am providng a button to update data.But still i am not able to see data in the node.Any suggestions on this.below code is wriiten on action of the button.
wdContext.currentContextElement().setPDFSource(null);
       try
            if(null!=wdContext.currentContextElement().getAttributePointer("Resource"))
       IWDResource fileResource = wdContext.currentContextElement().getResource();
     if("PDF".equalsIgnoreCase(fileResource.getResourceType().getFileExtension()))
       byte[] b = new byte[wdContext.currentContextElement().getResource().read(false).available()];
       wdContext.currentContextElement().getResource().read(false).read(b)                     wdContext.currentContextElement().setPDFSource(b);
       WDInteractiveFormHelper.transferPDFDataIntoContext                 (wdContext.currentContextElement().getPDFSource(), wdContext.nodeVn_TestData());
                 else
                      wdComponentAPI.getMessageManager().reportException("Please enter correct file");
            else
                 wdComponentAPI.getMessageManager().reportException("Error while uploading file");
       catch (Exception e) {
            wdComponentAPI.getMessageManager().reportException
            ("Error in uploading the Adobe Form :"+e.getLocalizedMessage(),false);
Regards,
Pavani

If you choose the second alternative you should erase these global variables after the second form is opened
You can erase the global variable using:
erase('global_var')
Greetings,
Sim

Passing parameters from one form to another

Hi,
I'm trying to pass parameters from 1 form to another. I would be able to call the form, but the parameters are not passed to the calling form. I do not know what's the problem. Basically, the 2nd form shows up with blank values in all the fields. Below is my code. Anybody expert in this, pl. help.
By the way my 1st form is based on PROCEDURE.
declare
s_requestor           number(10);
s_customer_impact      varchar2(4000);
s_creation_date      date;
l_url                varchar2(4000);
blk               varchar2(10) := 'DEFAULT';
begin
p_session.set_value(
p_block_name => blk,
p_attribute_name => 'A_P_REQUESTOR',
p_value => 88888);
s_requestor := p_session.get_value_as_number
(p_block_name => blk,
p_attribute_name => 'A_P_REQUESTOR');
s_customer_impact := p_session.get_value_as_varchar2
(p_block_name => blk,
p_attribute_name => 'A_P_CUSTOMER_IMPACT');
s_creation_date := p_session.get_value_as_date
(p_block_name => blk,
p_attribute_name => 'A_P_CREATION_DATE');
l_url:=('/pls/portal/PORTAL.wwa_app_module.link?
p_arg_names=_moduleid&p_arg_values=1794837934&
p_arg_names=_show_header&p_arg_values=YES&
p_arg_names=REQUESTOR&p_arg_values='||s_requestor||'&
p_arg_names=CREATION_DATE&p_arg_values='||s_creation_date||'&
p_arg_names=CUSTOMER_IMPACT&p_arg_values='||s_customer_impact);
PORTAL.wwa_app_module.set_target(l_url);
end;

the way to call one form from another and pass values for parameters from the procedure is like this:
PORTAL.wwa_app_module.link (
p_arg_names => PORTAL.wwv_standard_util.string_to_table2('_moduleid:_show_header:REQUESTOR:CREATION_DATE'),
p_arg_values => PORTAL.wwv_standard_util.string_to_table2('1191314879:YES:'||s_requestor||':'||s_creation_date));
and so on.
Hope it works for you

How to retrieve data from catsdb table and convert into xml using BAPI

How to retrieve data from catsdb table and convert into xml using BAPI
Points will be rewarded,
Thank you,
Regards,
Jagrut BharatKumar Shukla

Hi,
This is not your requirment but u can try this :
CREATE OR REPLACE DIRECTORY text_file AS 'D:\TEXT_FILE\';
GRANT READ ON DIRECTORY text_file TO fah;
GRANT WRITE ON DIRECTORY text_file TO fah;
DROP TABLE load_a;
CREATE TABLE load_a
(a1 varchar2(20),
a2 varchar2(200))
ORGANIZATION EXTERNAL
(TYPE ORACLE_LOADER
DEFAULT DIRECTORY text_file
ACCESS PARAMETERS
(FIELDS TERMINATED BY ','
LOCATION ('data.txt')
select * from load_a;
CREATE TABLE A AS select * from load_a;
SELECT * FROM A
Regards
Faheem Latif

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