How do I remove the last row in a csv data file

I would like to remove the last row of data from a csv file that I have saved. I can identify the start byte of the last row; however, I'm not sure what tool is the best one to remove it. Should I move the EOF? Should I open the file up to that point then save over the old one? Is there another way I don't know about? I am using labview 7.1.
Thanks

I would use the Read Text File. You can right-click on it and tell it to read lines. Then Delete From Array. Leave the index and length unwired and it will delete the last item (I noticed your code is removing the second line). Then open the file again set to replace or create and write your data. This method allows you to propagate your errors instead of the Write/Read Spreadsheet File handling the errors for you.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines
Attachments:
Remove last row of csv_BD.png ‏14 KB

Similar Messages

How can I delete the last row of a Matrix

Hi All,
Does anyone know whether deleting the last row of a matrix controlled by a UDO child table gives problems? I have the strange effect that I cannot delete the very last existing row in the matrix, i.e. after updating the delete the last to-be deleted row comes back into my matrix !!
I give you a snippet of my code (function getSelectedRow gives the selected row in the matrix):
==
if (evnt.ItemUID.Equals(ViewConstants.Items.DELETEBUTTON))
if (evnt.EventType == BoEventTypes.et_ITEM_PRESSED)
    if (evnt.BeforeAction)
      form = BusinessOne.Application.Forms.Item(formUID);
      mtx = (Matrix)form.Items.Item(ViewConstants.Items.MATRIX).Specific;
     int numRow = getSelectedRow(mtx);
     if (numRow != -1)
                                        mtx.DeleteRow(numRow);
                                        form.Mode = BoFormMode.fm_UPDATE_MODE;
                                   Item btn = (Item)form.Items.Item(ViewConstants.Items.ADDBUTTON);
                                   btn.Enabled = true;
==
Cheers,
Marcel Peek
Alpha One
Message was edited by: Marcel Peek
Message was edited by: Marcel Peek

Yes, there is a problem to delete the last row.
It is fixed in version 2005.

VBS:How can i determine the last row of an excel-sheet

I want to replace the chn-comments of an datafile. I pick up the chn-names and want to compare them with an excel-file and so get from the excel-file the right chn-comment and store int back in the datafile. my problem is how can i determine where the excelfile-row is on the end to load the loopounter with corr values.
i know one solution via scan on ascii 13 and 9.but bether is to know immediately the length of the column.
answers also in german possible.

Peter,
Are you using DIAdem's Excel Import Wizard? By "Excel file" do you mean a tab- or comma-delimited ASCII file that Excel can read in easily, or do you mean a file with the extension "*.xls"? You certainly could not search through an *.xls file to find CR/LF characters.
If you use the ASCII or Excel Import Wizard to create an *.STP file for the "Excel" file in question, then after the *.STP file is loaded you have access to a whole range of variables, starting with Ascii... or Excel... which completely outline the structure of the ASCII or Excel file, including things like the row in which the channel comments are, etc.
Why don't you send over your Excel file and I'll be able to help you a lot better.
Regards,
Brad Turpin
NI

How do I remove the last Char from a DefaultStyledDocument

Hello
This one sounds easy, I have a DefaultStyledDocument (displayed in a JTextPane) and i want to delete only the last character from it.
naturally i would try something like this:
myDoc.remove(myDoc.getLength()-1,1);but this only removes the second last character.
When i try
myDoc.remove(myDoc.getLength(),1);or even
myDoc.remove(myDoc.getLength()-1,2);I get a BadLocationException
What could I be doing wrong? this should be easy
Thanks in advance

What could I be doing wrong? this should be easy
Not could but did you do wrong
1) You didn't read the forum topic and as a result posted in the wrong forum. - shame on you.
2) indexes in Java are (almost) always zero based, so using the length as an index will fail. (if length is 2, the valid indexes are 0 and 1)
Thanks in advance

I bought my ipad2 used how do i remove the last persons gmail info

I need help deleting the last owner of the used ipad 2 i bought

I don't mean to throw a wrench into this, but if you had the previous owner's gmail account on the device, it leads me to believe that they, nor you, restored the device and it still had other information on it. If you update that device, you are liable to run into Activation Lock at a later date. It would be a good idea to approach this now, rather than later, when you still may have the ability to contact the previous owner. I would hate to see you update and have the device lock, then not be able to contact the previous owner and end up with a paperweight.

Extracting an index of the last row in a spreadsheet file.

Hi,
Here is a brief description of my program.
I'm checking if an xls file me already exists.. if not, then I created it.. if it does, then I'm opening it and I want to add additional rows to it.. I'm looking for a way to extract the indexof last row.. I tried using ReadFromSpreadheetFile.vi but failed toextract last row.. I dont want to use activeX and yes I did try searching the forum.
Any suggestions?
thanks

Not sure if this is what you are trying to acheive!
Beginner? Try LabVIEW Basics
Sharing bits of code? Try Snippets or LAVA Code Capture Tool
Have you tried Quick Drop?, Visit QD Community.

Table disabled after removing the last record

After removing the last row of table and disables it is unable to select any record.
Version: JDeveloper 11.1.1.2.0

Problem solution
my backBean:
protected void limpaSelecaoDaTabela() {
if (usaPopup)
if (table != null)
table.setSelectedRowKeys(null);
protected void limpaSelecaoDaTabela() {
if (usaPopup)
if (table != null)
table.getSelectedRowKeys().removeAll();
}

How to auto scroll a table to last row when using Active Data Service? 11g

Hi all,
Has anyone got any experience with the ADF Active Data Service?
I am using an af:table in combination with the ADF Active Data Service and I want the table to scroll to the latest row when new data arrives.
It is basically a simple setup:
The value attribute of my table points to a bean that extends CollectionModel and implements ActiveDataModel. This works perfectly. A soon as I receive new data in my bean, the table is automatically updated (e.g. a new row is inserted). I use JDev version: 11.1.1.3
The problem is that I can not get the scroll bar to move down to the last row automatically when new data arrives. The auto scroll only works for the client that actually performs a submit. In other words the person that submits the new data, will see his scrollbar move down, this is because I added the following code:
RowKeySet rowkeysset = chatTableBinding.getSelectedRowKeys();
rowkeysset.clear();
rowkeysset.add(getRowKey());
AdfFacesContext.getCurrentInstance().addPartialTarget(this.chatTableBinding);
This does not work for the clients that receive the new data via the Active data model. Apparently the active data service partially refreshes the table, but not in such a way that it sets the selected row to the last row?
My table definition:
<af:table value="#{pageFlowScope.chatBean.instantMessagingChatwindowBean}" var="row"
id="t1" columnStretching="last" rows="10"
styleClass="AFStretchWidth" autoHeightRows="10" contentDelivery="immediate"
horizontalGridVisible="false"
verticalGridVisible="false"
disableColumnReordering="true" displayRow="last"
rowSelection="single"
binding="#{pageFlowScope.chatBean.instantMessagingChatwindowBean.chatTableBinding}"
inlineStyle="height:80px;">
p.s.
The table is used to show incoming chat message.
I am building a chat client (taskflow) in a Webcenter application. The concept is similar of that presented by Lucas Jellemain in his blogpost on building a Google Talk Client http://www.oracle.com/technetwork/articles/jellema-googletalk-094343.html

Dan,
This is a thanks for posting your findings. You saved me quite some time.
<af:selectBooleanCheckbox id="showOnlyActiveSubscriptions" selected="true"
label="Show only active services:"
value="#{servicePortfolioBean.showOnlyActiveSubscriptions}"
autoSubmit="true" />
<af:table binding="#{servicePortfolioBean.serviceTable}" ...
partialTriggers="showOnlyActiveSubscriptions">
Of course, when I add a "ValueChangeListener" to the selectBooleanCheckbox, the PPR stops working. :( I wonder why?

How to get the last row in a resultset or query

Hi All
Say If I have a complex query which returns a resultset say 15 rows. Now I want to limit the output showing only the last row.
How can we do this

Keep in mind Oracle does not keep "row" order as such. Unlike a graphical type db like Access, Oracle will not always give you back the results in order.
Even if you were to use a sequence, your query is never guaranteed to give back the results in the order you are expecting. You must then give an order by statement to all queries expecting the order.
Your definition of last row too is vague - if it is in fact the greatest amount, use the inline view suggestion. If you simply want to see the last inserted row, consider adding a last_update_date column inserting the sysdate (by a trigger perhaps). This would then allow you to see the last inserted row.
Enjoy!

How to get the last row of a database table.

HI ,
I want to get record exactly from the last row of a database table.
How is that possible?

Hi,
To fetch last record from an internal table, just do find the number of records in it and read using index.
DESCRIBE TABLE ITAB LINES L_LINES.
READ TABLE ITAB INDEX L_LINES.
You can also use LOOP .. ENDLOOP but the above method is better (performance wise).
using LOOP .. ENDLOOP.
LOOP AT ITAB.
**do nothing
ENDLOOP.
**process ITAB (Header record of ITAB).
**after ENLOOP, ITAB will have the last record of the internal table.
[here ITAB is internal table as well as header record.]
But what is the requirement?
If you are looking for the current record of an employee then you can use ENDDA = HIGH_DATE.
My advice is to review your requirement again and try to fetch only that record which you need.
Mubeen

HELP! How te retrieve the last row in MYSQL database using Servlet!

Hi ,
I am new servlets. I am trying to retireve the last row id inserted using the servlet.
Could someone show me a working sample code on how to retrieve the last record inserted?
Thanks
MY CODE
import java.awt.*;
import java.awt.event.*;
import java.net.*;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class demo_gr extends HttpServlet {
//***** Servlet access to data base
public void doPost (HttpServletRequest req, HttpServletResponse resp)
     throws ServletException, IOException
     String url = "jdbc:mysql://sql2.njit.edu/ki3_proj";
          String param1 = req.getParameter("param1");
          PrintWriter out = resp.getWriter();
          resp.setContentType("text/html");
          String semail, sfname, slname, rfname, rlname, remail, message;
          int cardType;
          sfname = req.getParameter("sfname");
          slname = req.getParameter("slname");
          rfname = req.getParameter("rfname");
          rlname = req.getParameter("rlname");
          semail = req.getParameter("semail");
          remail = req.getParameter("remail");
          message = req.getParameter("message");
          //cardType = req.getParameter("cardType");
          cardType = Integer.parseInt(req.getParameter("cardType"));
          out.println(" param1 " + param1 + "\n");
     String query = "SELECT * FROM greeting_db "
+ "WHERE id =" + param1 + "";
          String query2 ="INSERT INTO greeting_db (sfname, slname ,semail , rfname , rlname , remail , message , cardType ,sentdate ,vieweddate) values('";
          query2 = query2 + sfname +"','"+ slname + "','"+ semail + "','"+ rfname + "','"+ rlname + "','"+ remail + "','"+ message + "','"+ cardType + "',NOW(),NOW())";
          //out.println(" query2 " + query2 + "\n");
          if (semail.equals("") || sfname.equals("") ||
          slname.equals("") || rfname.equals("") ||
          rlname.equals("") || remail.equals("") ||
          message.equals(""))
                    out.println("<h3> Please Click the back button and fill in <b>all</b> fields</h3>");
                    out.close();
                    return;
          String title = "Your Card Has Been Sent";
          out.println("<BODY>\n" +
"<H1 ALIGN=CENTER>" + title + "</H1>\n" );
               out.println("\n" +
"\n" +
" From " + sfname + ", " + slname + "\n <br> To "
                                        + rfname + ", " + rlname + "\n <br>Receiver Email " + remail + "\n<br> Your Message "
                                        + message + "\n<br> <br> :");
               if (cardType ==1)
                    out.println("<IMG SRC=/WEB-INF/images/bentley.jpg>");
               else if(cardType ==2) {
                    out.println("<IMG SRC=/WEB-INF/images/Bugatti.jpg>");
               else if(cardType ==3) {
                    out.println(" <IMG SRC=/WEB-INF/images/castle.jpg>");
else if(cardType ==4) {
                    out.println(" <IMG SRC=/WEB-INF/images/motocross.jpg>");
else if(cardType ==5) {
                    out.println(" <IMG SRC=/WEB-INF/images/Mustang.jpg>");
else if(cardType ==6) {
                    out.println("<IMG SRC=/WEB-INF/images/Mustang.jpg>");
out.println("</BODY></HTML>");
     try {
          Class.forName ("com.mysql.jdbc.Driver");
          Connection con = DriverManager.getConnection
          ( url, "*****", "******" );
Statement stmt = con.createStatement ();
               stmt.execute (query2);
               //String query3 = "SELECT LAST_INSERT_ID()";
               //ResultSet rs = stmt.executeQuery (query3);
               //int questionID = rs.getInt(1);
               System.out.println("Total rows:"+questionID);
stmt.close();
con.close();
} // end try
catch (SQLException ex) {
          //PrintWriter out = resp.getWriter();
     resp.setContentType("text/html");
          while (ex != null) {
     out.println ("SQL Exception: " + ex.getMessage ());
     ex = ex.getNextException ();
} // end while
} // end catch SQLException
catch (java.lang.Exception ex) {
     //PrintWriter out = resp.getWriter();
          resp.setContentType("text/html");
          out.println ("Exception: " + ex.getMessage ());
} // end doGet
private void printResultSet ( HttpServletResponse resp, ResultSet rs )
throws SQLException {
try {
          PrintWriter out = resp.getWriter();
     out.println("<html>");
     out.println("<head><title>jbs jdbc/mysql servlet</title></head>");
     out.println("<body>");
     out.println("<center><font color=AA0000>");
     out.println("<table border='1'>");
     int numCols = rs.getMetaData().getColumnCount ();
while ( rs.next() ) {
          out.println("<tr>");
     for (int i=1; i<=numCols; i++) {
out.print("<td>" + rs.getString(i) + "</td>" );
} // end for
out.println("</tr>");
} // end while
     out.println("</table>");
     out.println("</font></center>");
     out.println("</body>");
     out.println("</html>");
     out.close();
     } // end try
catch ( IOException except) {
} // end catch
} // end returnHTML
} // end jbsJDBCServlet

I dont know what table names and fields you have but
say you have a table called XYZ which has a primary
key field called keyID.
So in order to get the last row inserted, you could
do something like
Select *
from XYZ
where keyID = (Select MAX(keyID) from XYZ);
Good Luckwhat gubloo said is correct ...But this is all in MS SQL Server I don't know the syntax and key words in MYSQL
This works fine if the emp_id is incremental and of type integer
Query:
select      *
from      employee e, (select max(emp_id) as emp_id from employee) z
where      e.emp_id = z.emp_id
or
select top 1 * from employee order by emp_id descUday

How to display the last row in a table

I have a table that is constantly updating, and I always want to see the last row. How can I get my table to auto scroll?

Hi žabić,
there is a property called "top left visible row". You can use it to scroll your table.
edit:
Maybe this is not the exact name, but you can see an example here
Mike
Message Edited by MikeS81 on 05-27-2010 03:57 PM

How to set focus on the last row of JTextPane

how to set focus on the last row of JTextPane?
import javax.swing.*;
import javax.swing.text.html.*;
import java.awt.*;
import java.awt.event.*;
public class MyGUITest extends JPanel implements ActionListener
{   public static void main(String[] args)
    {   SwingUtilities.invokeLater(new Runnable()
         {   public void run()
          {    JFrame f = new JFrame("My GUI");
              MyGUITest GUI = new MyGUITest();
              GUI.setOpaque(true);
              f.setContentPane(GUI);
              f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
              f.pack();
              f.setLocationRelativeTo(null);
              f.setVisible(true);
    JTextPane txtP;
    JButton add;
    HTMLEditorKit hek;
    HTMLDocument hd;
    String txt;
    MyGUITest()
    {     this.setLayout(new BorderLayout());
     this.setPreferredSize(new Dimension(400,200));
     txtP = new JTextPane();
     txtP.setEditable(false);
     txtP.setContentType("text/html");
     txtP.setText("");
     hek = new HTMLEditorKit();
     txtP.setEditorKit(hek);
     hd = new HTMLDocument();
     txtP.setDocument(hd);
     JScrollPane sTxtA = new JScrollPane(txtP);
     add = new JButton("add");
     add.addActionListener(this);
     sTxtA.setBorder(BorderFactory.createTitledBorder(""));
     this.add(sTxtA, BorderLayout.CENTER);
     add(add, BorderLayout.SOUTH);
     new Thread(new Runnable()
     {   public void run()
         {   while(true)
          {   try
              {     Thread.sleep(100);
              }catch(InterruptedException ex)
              {     ex.printStackTrace();
              appendText("This is <b>HTML</b> text");
              //add.doClick();
     }).start();
    public void actionPerformed(ActionEvent e)
    {     txt = "<b>asd</b>";
     try
     {   hek.insertHTML(hd, hd.getLength(), txt, 0, 0, null);
     }catch(Exception ex){   ex.printStackTrace();   }
    public void appendText(String txt)
    {     try
     {   hek.insertHTML(hd, hd.getLength(), txt, 0, 0, null);
     }catch(Exception ex){   ex.printStackTrace();   }
}thanks~

anIdiot wrote:
im not sure what is the caret location...So don't youthink you should have looked for it in the API?
anyway, i want the scroll bar to scrolled down automatically when the output is displayed.
normally, the scroll bar is scrolled down automatically when a new text is inserted, but it doesnt work on this timeGo through camockr's http://tips4java.wordpress.com/2008/10/22/text-area-scrolling/
db

How to get the last row

I have 10 rows in my table and I have to retrive last row using rownum.
For this I use
SELECT * from <table_name>
where rownum<=10
minus
SELECT * from <table_name>
where rownum<=9
The result is no rows selected
In the same case if I use
SELECT rownum from <table_name>
Where rownum <= 10
minus
SELECT rownum from <table_name>
where rownum <=9
The result is 10
Why this happend.
If the result is 10, then why the row whose rowid is 10 is not retrived

All
Please bear in mind that ROWNUM is an attribute of the query NOT the table. The last row returned by an unORDERed SELECT statement may be the most recently inserted row but is not guaranteed to be so.
The only way of assuring yourself of returning the most recent row is either to timestamp all your tables with a date_created column or to use a primary key with an ascending value.
rgds, APC

How to Finding the Last Row Value in Datagrid?

Hi Everyone,
Thanks in Advance.
I need your help, to find the last row data in Datagrid.
Actually i am using Datagrid to display my Data in flex. In my data i stored the gender value of employees. So if the last row in my datagrid is "female" i need to be highlight that particular row. So please help me to solve this issue.
Thanks,
Charles. J

datagrid.selectedIndex = datagrid.dataprovider.length;
^ something like this will select the last row in the datagrid.
if you need to check it's value, you might need to cast an object here, based on the index value, and check it's gender value.
datagrid.selectedIndex = datagrid.dataprovider.length;
if (datagrid.selectedItem["gender"] == "female") {
//handle here

How do I remove the last row in a csv data file

Similar Messages

Maybe you are looking for