Using servlets to read from text file and insert data

Hi,
Can I use a servlet to read from a space delimited text file on the client computer and use that data to insert into a table in my database? I want to make it easy for my users to upload their data without having to have them use SQL*Loader. If so can someone give me a hint as how to get started? I appreciate it.
Thanks,
Colby

Create a page for the user to upload the file to your webserver and send a message (containing the file location) to a server app that will open the file, parse it, and insert it into your database. Make sure you secure the page.
or
Have the user paste the file into a simple web form that submits to a servlet that parses the data and inserts it into your db.

Similar Messages

Urgent Help:read from text file and write to table

Hi,
I'm a super beginner looking for a vi to read this data from a text file and insert it into a table:
   #19
Date: 05-01-2015
ID= 12345678
Sample_Rate= 01:00:00
Total_Records= 2
Unit: F
   1 03-23-2015 10:45:46   70.1   3.6
   2 03-23-2015 11:45:46   67.7   2.7
Output table
#     date                 time                 x          y        Sample rate    Total Records
1          03-23-2015     10:45:46        76.8     2.8      01:00:00           2
2          03-23-2015     10:45:46        48.7 2.1      01:00:00           2
Thanks for your help in advance.
Attachments:
sample.txt ‏1 KB

jcarmody wrote:
Will there always be the same number of rows of noise header information?
Show us how you've read the data and what you've tried to do to parse it. Once you've got the last rows, you can loop over them using Spreadsheet String to Array (after cleaning up a few messy spaces).
Jim,
I didn't know you're that active on here.
Yes, There will always be the same number of noise header information.
I'll show you in person
Regards,

Pool data from text file and insert into database

Can anyone tell me how to pool data from a text file and insert into database?
let's say my text file is in this format
123456 Peter 22
234567 Nicholas 24
345678 Jane 20
Then I need to insert the all the value for this three column into a table which has the three column name ID, Name, Age
Anyone knows? I need to do this urgently...Thank in advanced

1. Use BufferedReader and read the file line by line.
2. Loop thru the file and do the following steps with in this loop.
3. Use StringTokenizer to seperate each line into three values (columns).
4. Now create a insert statement with these values and add the statement to the batch (using addBatch() method of PreparedStatement or Statement).
5. Finally (after exiting the loop), execute these batch of statements (using ps.executeBatch()).
Sudha

Read from text file and seperate column

hello,
I have a problem reading my text file. This text file is downloaded from weather link. All data will be changed upon the selection of user. my problem is I can read the data column by column but i cannot retrive the right column header for each data. I also attached the test file. Can somebody help me? Thanks in advance..
Attachments:
download.txt ‏8 KB
read text file.JPG ‏11 KB
read data.JPG ‏43 KB

Hi
Sorry, I missed that one. The file formatting is strange though. It uses spaces to separate columns but also within columns. I attached a modified VI that tries to take care of that, but it fails at the columns "Solar Energy" and "Hi Solar Rad.". This is very difficult to read programmatically as there's one space each between "Solar", "Hi", and "Solar" again. So how do we distinguish between column separator and space within column?
Is download.txt the original file? Or was it probably modified by an editor that would replace tabs by space characters?
Attachments:
test-mod-2.vi ‏11 KB

Read from txt file and analyse data

hi,
i am having a problem for reading data from a text file and checking whether it is a integer or not.
basically if i have a txt file with the following content:
12 45 345 500 45.67684 33
my output should be:
12 45 345 500 invalid 33
that means if there is a integer number in the file, the integer number will be printed on the screen BUT if there is anything else like a string or a double number, then "invalid" will be printed.
how can i check what kind of datatype it is??
i have the following code to start with:
try
            BufferedReader in = new BufferedReader(new FileReader(FileName));
            String l = in.readLine();
            in.close();
        catch(IOException e)
            System.out.println("IO error");
            System.exit(0);
        }

ok i have tried the following code:
        int index = 0;
        String[] arr = null;
        int nb = 0;
        try
            BufferedReader in = new BufferedReader(new FileReader(nameFile));
            String line = in.readLine();
            arr = line.split(" ");
            for(int i=0; i<arr.length; i++)
                index = i;
                nb = Integer.parseInt(arr);
System.out.print(nb+" ");
in.close();
catch(IOException e)
System.out.println("IO error");
System.exit(0);
catch(NumberFormatException e)
System.out.print("invalid ");
for(int j=index+1; j<arr.length; j++)
nb = Integer.parseInt(arr[j]);
System.out.print(nb+" ");
which works perfectly fine for the following scenario:
txt-file:
12 45 345 500 45.67684 33
output:
12 45 345 500 invalid 33
but what, if I have the following data in my txt file:
12 45 345 500 45.67684 33 23.234 21
then the output should be:
12 45 345 500 invalid 33 invalid 21
how can i solve this???

Read from text file and plot in real time

Hello to everybody,
I recently started using labview and so I know very few features, I apologize for any crap I'm about to write.
My problem is as follows:
_ A wireless node is sampling, with a known frequency, the voltage and the current of an electronic device
_ These data are sent to a coordinator connected to the PC
_ Each packet sent includes a single column with: Letter V followed by voltage samples, Letter I followed by current samples (all in a single column as in the attached example)
_ The coordinator saves it in a .txt file
I want to do a labview application that:
_ Reads that file (continuosly update by the coordinator)
_ Plots on two different graphs the values (over the time) of current and voltage
Thanks for your help
Danilo
Attachments:
TextData.txt ‏1 KB

There are File IO examples that ship with LV which show you how to write to red from a file . A more fundamental question though is why have the file at all? Is it serving strictly as a data communication channel, or will it be used for something else?
The "coordinator" that you mention, can it be accessed directly? Serial IO? TCP/IP? Telnet? ActiveX? .NET? Anything?
If so, that would be the preferred way to handle this situation.
Mike...
PS: Sorry for the next bit, but I used to be a magazine editor and my grandmother was a school teacher so I am just a tiny bit anal retentive about word usage: In English "data" is a funny word in that while it is a singular form, it is (depending upon context) often understood to referring to multiple things and so can be sort of plural. Consequently, it is proper to say: "This data is sent.. " or "The data indicates...", but not, "The data are showing..". Likewise it is always incorrect to try to make it plural by saying "datas".
PPS: The same goes for the word "code" when used as a noun. It can also be a verb, but that's a whole different rant...
PPPS: Also be aware that many of the people who know me well would object to the "tiny bit" part...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
Be thinking ahead and mark your dance card for NI Week 2015 now: TS 6139 - Object Oriented First Steps

How to read a CSV file and Insert data into an Oracle Table

Hi All,
I have a Clob file as a in parameter in my PROC. . File is comma separated.need procedure that would parse this CLOB variable and populate in oracle table .
Please let me some suggestions on this.
Thanks,
Chandra R

jeneesh wrote:
And, please don't "hijack" 5 year old thread..Better start a new one..I've just split it off to a thread of it's own. ;)
@OP,
I have a Clob file as a in parameter in my PROC. . File is comma separated.need procedure that would parse this CLOB variable and populate in oracle table .You don't have a "clob file" as there's no such thing. CLOB is a datatype for storing large character based objects. A file is something on the operating system's filesystem.
So, why have you stored comma seperated data in a CLOB?
Where did this data come from? If it came from a file, why didn't you use SQL*Loader or, even better, External Tables to read and parse the data into structured format when populating the database with it?
If you really do have to parse a CLOB of data to pull out the comma seperated values, then you're going to have to write something yourself to do that, reading "lines" by looking for the newline character(s), and then breaking up the "lines" into the component data by looking for commas within it, using normal string functions such as INSTR and SUBSTR or, if necessary, REGEXP_INSTR and REGEXP_SUBSTR. If you have string data that contains commas but uses double quotes around the string, then you'll also have the added complexity of ignoring commas within such string data.
Like I say... it's much easier with SQL*Loader of External Tables as these are designed to parse such CSV type data.

Reading a text file and transferring values into array

Hi,
I have a problem. So what I am trying to do is that, I read a text file and insert specific values from the text file into an array for future needs.
But I have to make sure that there is no duplicate entries. So thats what I have but, my method takes forever to finish...
here is my code:
String nomFichier = "Test_" + numTest + "_" + date + ".txt";
        String ligne = "";
        int z = 0;
        int j = 0;
        BufferedReader lecteurFichier = new BufferedReader(new FileReader(nomFichier));
        while ((ligne = lecteurFichier.readLine()) != null) {
            if (z > 3)
                String valeur = "";
                String dist = "";
                boolean unique = true;
                String [] chiffre = ligne.split(";");
                 if (intervalleAnalyser == 1)
                    valeur = chiffre[3];
                    dist = chiffre[4];
                if (intervalleAnalyser == 2)
                    valeur = chiffre[2];
                    dist = chiffre[4];
                if (intervalleAnalyser == 3)
                    valeur = chiffre[1];
                    dist = chiffre[4];
                if (z == 4) {
                    intervalleDiagramme[j] = valeur;
                    j++;
                if (z > 4) {
                    for (int i = 0; i < intervalleDiagramme.length; i++)
                         for (int x = 0; x < i; x++)
                             if(intervalleDiagramme[i] == intervalleDiagramme[x])
                                unique = false;
                    if (unique)
                        intervalleDiagramme[j] = valeur;
                    j++;
            z++;
        lecteurFichier.close(); // toujours fermer le fichier

Hi,
Thanks for your reply,
1) Yeah I have a method that asks the question and assigns it to a variable.
2) Well the z will stop once there is no lines to read no?
for the set.add(), I am not that familar...
I changed bit a code and I have this now:
if (z > 4) {
                    for (int i = 0; i < intervalleDiagramme.length; i++)
                        System.out.println(intervalleDiagramme);
if(intervalleDiagramme[i].equals(valeur))
System.out.println(intervalleDiagramme[i] + " " + valeur);
unique = false;
if (unique)
intervalleDiagramme[j] = valeur;
EDIT:
I figured a way to assign " " to all the values in my array. But I get this error:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 380
at TP3.lireFichier(TP3.java:305)
And my line 305 is: intervalleDiagramme[j] = valeur;
EDIT2:
So ok I found my mistake and corrected it. But I want to know is there a way of doing this without setting the size of the array? because sometimes there needs to be 21 values sometimes 19 and sometimes 20....
If I take out: = new String [21] out I get a NullPointer error...
Edited by: Ara1992Habs on Dec 13, 2009 7:29 AM
Edited by: Ara1992Habs on Dec 13, 2009 7:37 AM

Read text file and insert into MySQL

Dears,
I need to read text file and then insert the data in the correct column in the MySQL database
example
I have the following text file:
field1=1234 field2=56789 field3=444555
field1=1333 field2=2222 field3=333555
and so on and so forth ,,note that all rows are identical and just the filed value is changed(there is a dilemeter between fields)
how can I read field1,field2 and field3 from text file and insert them in the correct table and column in the database.....
any help?????
thanks for your cooperation
Best Regars

Sure.
Which part don't you understand?
1. Reading a text file
2. Parsing the text file contents.
3. Relational databases and SQL.
4. How to create a database.
5. How to connect to a database in Java.
6. How to insert records into the database in Java.
7. How to map Java objects to records in a database.
This is a pretty nice list. Solve complex problems by breaking them into smaller ones.
%

How to read from excel file and write it using implicit jsp out object

our code is as below:Please give us proper solution.
we are reading from Excel file and writing in dynamicaly generated Excel file.it is writing but not as original excel sheet.we are using response.setContentType and response.setHeader for generating pop up for saveing the original file in to dynamically generated Excel file.
<%@ page contentType="application/vnd.ms-excel" %>
<%
     //String dLoadFile = (String)request.getParameter("jspname1");
     String dLoadFile = "c:/purge_trns_nav.xls" ;
     File f = new File(dLoadFile);
     //set the content type(can be excel/word/powerpoint etc..)
     response.setContentType ("application/msexcel");
     //get the file name
     String name = f.getName().substring(f.getName().lastIndexOf("/") + 1,f.getName().length());
     //set the header and also the Name by which user will be prompted to save
     response.setHeader ("Content-Disposition", "attachment;     filename="+name);
     //OPen an input stream to the file and post the file contents thru the
     //servlet output stream to the client m/c
          FileInputStream in = new FileInputStream(f);
          //ServletOutputStream outs = response.getOutputStream();
          int bit = 10;
          int i = 0;
          try {
                    while (bit >= 0) {
                    bit = in.read();
                    out.write(bit) ;
} catch (IOException ioe) { ioe.printStackTrace(System.out); }
          out.flush();
out.close();
in.close();
%>

If you want to copy files as fast as possible, without processing them (as the DOS "copy" or the Unix "cp" command), you can try the java.nio.channels package.
import java.nio.*;
import java.nio.channels.*;
import java.io.*;
import java.util.*;
import java.text.*;
class Kopy {
     * @param args [0] = source filename
     *        args [1] = destination filename
    public static void main(String[] args) throws Exception {
        if (args.length != 2) {
            System.err.println ("Syntax: java -cp . Kopy source destination");
            System.exit(1);
        File in = new File(args[0]);
        long fileLength = in.length();
        long t = System.currentTimeMillis();
        FileInputStream fis = new FileInputStream (in);
        FileOutputStream fos = new FileOutputStream (args[1]);
        FileChannel fci = fis.getChannel();
        FileChannel fco = fos.getChannel();
        fco.transferFrom(fci, 0, fileLength);
        fis.close();
        fos.close();
        t = System.currentTimeMillis() - t;
        NumberFormat nf = new DecimalFormat("#,##0.00");
        System.out.print (nf.format(fileLength/1024.0) + "kB copied");
        if (t > 0) {
            System.out.println (" in " + t + "ms: " + nf.format(fileLength / 1.024 / t) + " kB/s");
}

How to open saved files using 'read from text file' function

Hi everyone, I am having a hard time trying to solve the this particular problem ( probably because I am a newb to lanbview ). Anyway , I am able to save the acquired waveforms by using the 'Write to text file' icon. I did manually modify the block diagram of the 'Write to text file' icon and create the correct number of connector so as to make my program work. But now I have no idea on how to modify the block diagram of the 'Read from text file' block diagram to make my program 'open' my saved waveforms. Or i do not have to modify anything from the block diagram of the 'Read from text file'? Can anyone teach/help me connect up? Do i need the build array on the "open" page?
Here are some screenshots on part of my program
let me know if you guys would need more information / screenshots thank you!
Attachments:
ss_save.jpg ‏94 KB
ss_open.jpg ‏94 KB
modified_writetotextfile.jpg ‏99 KB

Ohmy, thanks altenbach. oh yeah i forgot about those sub VIs. will upload them now. Was rather demoralized after reading the comments and really struck me on how weak i'm at on labview really hope to get this done. But of course i have to study through and see how it works. Actually i am going to replace those 'signal generators sub vi' with ThoughtTechonology's sample code so i can obtain data waveforms real-time using Electrocardiography (ECG) ,Electromyography (EMG ) and Electroencephalography (EEG) hopefully i can find out how to connect the sample code.
( ps . cant connect it now unless my program is working otherwise labview will crash )
( p.s.s the encoder of my biofeedback trainer already acts as an DAQ so i wont need to place an DAQ assistant in my block diagram i suppose )
The sample code of ThoughtTechnology is named as attachment.ashx.vi. too bad i cant use it and present it as my project
Attachments:
frequency detactor.vi ‏53 KB
signal generator.vi ‏13 KB
attachment.ashx.vi ‏40 KB

Why does Read from Text file default to array of 9 elements

I am writing to a text file starting with a type def. cluster (control) of say 15 dbl numeric elements, that works fine I open the tab-delimited text file and all of the elements appear in the file. However when I read from the same text file back to the same type def. cluster (indicator), the read from text file defaults to 9 elements?? Is there a way to control how many elements are read from the file. This all works great when I initially use a cluster of 9 elements and read back to a cluster of 9 elements.
Solved!
Go to Solution.

From the LabVIEW Help: http://zone.ni.com/reference/en-XX/help/371361G-01/glang/array_to_cluster/
Converts a 1D array to a cluster of elements of the same type as the array elements. Right-click the function and select Cluster Size from the shortcut menu to set the number of elements in the cluster.
The default is nine. The maximum cluster size for this function is 256.
Aside: so, how many times has this question been asked over the years?

LabVIEW for ARM 2009 Read from text file bug

Hello,
If you use the read from text file vi for reading text files from a sdcard there is a bug when you select the option "read lines"
you cannot select how many lines you want to read, it always reads the whole file, which cause a memory fault if you read big files!
I fixed this in the code (but the software doesn't recognize a EOF anymore..) in CCGByteStreamFileSupport.c
at row 709 the memory is allocated but it tries to allocate to much (since u only want to read lines).
looking at the codes it looks like it supposed to allocated 256 for a string:
Boolean bReadEntireLine = (linemode && (cnt == 0));
if(bReadEntireLine && !cnt) {
  cnt = BUFINCR;    //BUFINCR=256
but cnt is never false since if you select read lines this is the size of the file!
the variable linemode is also the size of the file.. STRANGE!
my solution:
Boolean bReadEntireLine = (linemode && (cnt > 0)); // ==
if(bReadEntireLine) {    //if(bReadEntireLine && !cnt) {
  cnt = BUFINCR;
and now the read line option does work, and reads one line until he sees CR or LF or if the count of 256 is done.
maybe the code is good but the data link of the vi's to the variables may be not, (cnt and linemode are the size of the file!)
count should be the number of lines, like chars in char mode.
linemode should be 0 or 1.
Hope someone can fix this in the new version!
greets,
Wouter
Wouter.
"LabVIEW for ARM guru and bug destroyer"

I have another solution, the EOF works with this one.
the cnt is the bytes that are not read yet, so the first time it tries to read (and allocate 4 MB).
you only want to say that if it's in line mode and cnt > 256 (BUFINCR) cnt = BUFINCR
the next time cnt is the value of the bytes that are not read yet, so the old value minus the line (until CR LF) or if cnt (256) is reached.
with this solution the program does not try to allocate the whole file but for the max of 256.
in CCGByteStreamFileSupprt.c row 705
if(linemode && (cnt>BUFINCR)){
cnt = BUFINCR;
don't use the count input when using the vi in line mode. count does not make sense, cnt will be the total file size. also the output will be an array.
linemode seems to be the value of the file size but I checked this and it is just 0 or 1, so this is good
update: damn it doesn't work!
Wouter.
"LabVIEW for ARM guru and bug destroyer"

Trying to parse a file-read from text file.vi

I'm attempting to read a txt file that has tab separated data. In the fourth (or any) column is the only data I need. The data is a string of numbers (23.454).
I've used the Read from Text File.vi and the Read From Spreadsheet.vi and I just don't seem to have enough LV background to extract the pertinent data into a graph. any suggestions?

(It is silly to use "delete from array" if all you want is a column. The correct function is "index array")
Joe's idea above basically works fine. Here's a quick adapdation (the node before the graph is "index array" from the array palette.).
Message Edited by altenbach on 06-11-2007 11:57 AM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
FileRead.png ‏11 KB

Set a timeout for "read from text file"

I Need to read from a text file on a remote pc and use the read from text file function to do this. It wotks but sometimes this pc is down causing long wait times in my vi.
Is there a way to set a timeout for the read from text file function, or is there an other solution?
Thank you

You could check that the path is valid first before you attempt to read the file. hen put the file read in a True-False case structure based on the results of the check. You can use the function "Check if File or Folder Exists" It checks whether a file or folder exists on disk at a specified path. This VI works with standard files and folders as well as files in LLB files. The function is found in the File I/O --> Advanced File Functions palette.
Tom

Using servlets to read from text file and insert data

Similar Messages

Maybe you are looking for