Why is the second row in the recordset not updated?
Hi,
I have this problem.
I have written a servlet named processPOItem.
The following is the doPost Method in the processPOItem class:
public class processPOItem extends HttpServlet {
//attributes
public String strPO;
ConnectionPool connectionPool = null;
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
int counter=0, remainder=0;
String SearchPOItems;
String strStatus, ISBN;
String price;
response.setContentType("text/html"); //html output
PrintWriter out = response.getWriter();
//get the parameter named PO
strPO = request.getParameter("PO");
Connection dbConn = null;
try{
out.println("<html>");
out.println("<head>");
out.println("<title>Purchase Order " + strPO + "</title>");
out.println("</head>");
out.println("<body>");
out.println("<table width=600 border=0 align=center>");
out.println("<tr>");
out.println("<td colspan=4 align=center>");
out.println("<font face=Arial size=2>");
out.println("<b>Purchase Order: " + strPO + "</b>");
out.println("</font>");
out.println("</td>");
out.println("</tr>");
out.println("</table>");
out.println("<form method=post action=processPOItem>");
out.println("<input name=updatePO type=hidden value=1>");
out.println("<table width=800 border=0 cellspacing=1 cellpadding=0 align=center>");
out.println("<tr bgcolor=\"#990000\">"); //Display the mb_PurchaseItem
out.println("<td align=center><b><font size=1 face=Verdana color=\"#FFFFFF\">No</font></b></td>");
out.println("<td align=center><b><font size=1 face=Verdana color=\"#FFFFFF\">ISBN</font></b></td>");
out.println("<td align=center><b><font size=1 face=Verdana color=\"#FFFFFF\">Title</font></b></td>");
out.println("<td align=center><b><font size=1 face=Verdana color=\"#FFFFFF\">Status</font></b></td>");
out.println("<td align=center><b><font size=1 face=Verdana color=\"#FFFFFF\">Quantity</font></b></td>");
out.println("<td align=center><b><font size=1 face=Verdana color=\"#FFFFFF\">Unit Price</font></b></td>");
out.println("<td align=center><b><font size=1 face=Verdana color=\"#FFFFFF\">Delivered Date</font></b></td>");
out.println("</tr>");
//get the SQL statement
SearchPOItems = searchSQL(strPO);
//get free connection from Pool
dbConn = connectionPool.getConnection();
//create a statement object
Statement stmt = dbConn.createStatement();
//create the recordset
ResultSet rs = stmt.executeQuery(SearchPOItems);
//display the recordset
while (rs.next())
counter++;
remainder = counter % 2;
if (remainder == 0)
out.println("<tr bgcolor=\"#C1C1C1\">");
else
out.println("<tr bgcolor=\"#E1E1FF\">");
//Display the individual Purchase item under the customer
out.println("<td align=center><font size=1 face=Verdana>" + counter + "</font></td>");
ISBN = rs.getString("mb_ISBN");
out.println("<td align=center><font size=1 face=Verdana>" + ISBN + "</font></td>");
out.println("<td align=center><font size=1 face=Verdana>" + rs.getString("mb_Title") + "</font></td>");
strStatus = rs.getString("mb_Status");
out.println("<td align=center><font size=1 face=Verdana>");
out.println("<select name=\"mb_Status" + ISBN + "\">");
out.println("<option value=PENDING");
if (strStatus.equals("PENDING"))
out.println("selected>Pending</option>");
else
out.println(">Pending</option>");
out.println("<option value=PROCESSING");
if (strStatus.equals("PROCESSING"))
out.println("selected>Processing</option>");
else
out.println(">Processing</option>");
out.println("<option value=DELIVERED");
if (strStatus.equals("DELIVERED"))
out.println("selected>Delivered</option>");
else
out.println(">Delivered</option>");
out.println("<option value=CANCELLED");
if (strStatus.equals("CANCELLED"))
out.println("selected>Cancelled</option>");
else
out.println(">Cancelled</option>");
out.println("</select>");
out.println("</font>");
out.println("</td>");
out.println("<td align=center><font size=1 face=Verdana>" + rs.getString("mb_Qty") + "</font></td>");
/*price = rs.getString("mb_Price");
NumberFormat moneyAmount = NumberFormat.getCurrencyInstance();
Double dPrice = Double.parseDouble(price);
out.println("<td align=center><font size=1 face=Verdana>" + rs.getString("mb_Price") + "</font></td>");
out.println("<td align=center colspan=2><font size=1 face=Verdana>");
if (strStatus.equals("DELIVERED"))
//status = "DELIVERED"
out.println("<input align=center name=\"deliveredDate" + ISBN + "\" type=text size=10 maxlength=10 value=" + rs.getString("mb_DeliveredDate") + ">");
else
out.println("<input align=center name=\"deliveredDate" + ISBN + "\" type=text size=10 maxlength=10 value=Nil disabled>");
out.println("</font>");
out.println("</td>");
out.println("</tr>");
out.println("<tr><td> </td></tr>");
out.println("<TR>");
out.println("<TD colspan=3 align=center>");
out.println("<INPUT TYPE=submit BORDER=1 value=update name=update>");
out.println("</td>");
out.println("<TD colspan=3 align=center>");
out.println("<a href=\"javascript:window.close()\"><img src=\"Close.gif\" BORDER=0></a>");
out.println("</td>");
out.println("</tr>");
out.println("<tr>");
rs.close();
stmt.close();
out.println("</form>");
out.println("</table>");
out.println("</body>");
out.println("</html>");
out.close();
catch (Exception e)
//sendErrorToClient(out, e); //send stack trace to client
System.out.println(e.getMessage());
finally{
//return connection to Pool
connectionPool.returnConnection(dbConn);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
response.setContentType("text/html"); //html output
PrintWriter out = response.getWriter();
Connection dbConn = null;
//get the parameters posted back by processPOItem servlet
String processingAll = request.getParameter("processingAll");
String deliveredAll = request.getParameter("deliveredAll");
String deliveredDate = request.getParameter("deliveredDate");
String refInvoice = request.getParameter("refInvoice");
String refNumber = request.getParameter("refNumber");
//String status = request.getParameter("status");
//check if update button is pressed
String updatePO = request.getParameter("updatePO");
//sql statement variable
String sqlUpdatePOStatus;
String isbn, poItemStatus;
//update button was pressed
if (!updatePO.equals(""))
try{
//get the SQL statement
String SearchPOItems = searchSQL(strPO);
//get free connection pool
dbConn = connectionPool.getConnection();
//create a statement object
Statement stmt = dbConn.createStatement();
//create the recordset
ResultSet rs = stmt.executeQuery(SearchPOItems);
int index = 0;
//display the recordset
while (rs.next())
isbn = rs.getString("mb_ISBN");
poItemStatus = request.getParameter("mb_Status" + isbn);
out.println(isbn + " " + poItemStatus);
out.println("<br>");
//update the status of individual PO item
if (!poItemStatus.equals(""))
sqlUpdatePOStatus = updatePOItemSQL(strPO, isbn, poItemStatus);
stmt.executeUpdate(sqlUpdatePOStatus);
rs.close();
stmt.close();
out.close();
catch (Exception e)
System.out.println(e.getMessage());
finally{
//return connection to pool
connectionPool.returnConnection(dbConn);
}When I perform a form submit in my doGet() method, the doPost Method() responsed. However, it encounter error in updating the second row in the recordset as highlighted in bold.
After the first row is updated. The second row did not get updated at all.
The error return was "Resultset is closed".
What actually is wrong? How can I execute a sqlstatement inside a recordset? How to solve this problem?
Did you turn on the "updatable" switch for the result
set?
public Statement createStatement(int resultSetType,
int resultSetConcurrency) throws
SQLException
Parameters:
resultSetType - a result set type; see
ResultSet.TYPE_XXX
resultSetConcurrency - a concurrency type; see
ResultSet.CONCUR_XXX
static int CONCUR_UPDATABLE
JDBC 2.0 The concurrency mode for a ResultSet object
that may be updated.Hi,
do you refer to the following change of code:
//create a statement object (original)
Statement stmt = dbConn.createStatement();change to the following:
//create a statement object (original)
Statement stmt = dbConn.createStatement(resultSetType,
resultSetConcurrency);when I use another statement object for executeupdate, what I got was the connection was used by another hstmt. Thus the second column was not updated at all.
Why?
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