Read dataset - read data randomly

Dear All,
I am facing a strange problem while reading data through READ DATASET statement.
The data is getting read randomly from the file.
For example, if my text file contains 10,000 records, i am able to see around 800 in my internal table.
Also, with read dataset statement, sometimes first record gets read, second time fifth record and so on. There is no particular order.
Read dataset statement is skipping a lot of records while reading data from the file.
Has anyone face this problem earlier?
Any clue in this direction will be highly appreciated.
Many thanks.
Best Regards,
Tarun

Hi,
how you are looking your input file, if it is in NOTEPAD check menu option 'Format----> Word wrap' is unchecked and then see the how many entries are there in the file.
Regards,
Sreeram.

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Read data randomly

How can I read data records from an internal table in a random order?
My aim is to select records randomly from an internal table without speciafying a key.

I think the function RANDOM_AMOUNT gives decimal numbers
Use this code to get only integers
*& Report ZKRIS_RANDOM
report zkris_random.
selection-screen begin of block b1 with frame title title1.
selection-screen begin of block b2 with frame title title2.
    parameters: low type i.
    parameters: high type i.
selection-screen end of block b2.
parameters: num_vals type i.
selection-screen end of block b1.
initialization.
title1 = 'Parameters'.
title2 = 'Limits'.
start-of-selection.
types: begin of random_numbers_type,
    random_nr type i,
    end of random_numbers_type.
data: random_numbers type random_numbers_type occurs 0 with header line.
constants: a type i value 21,
             c type i value 101,
             m type i value 32768,
             start type i value 500.
data: new_num type i,
        interval type i.
data: last_num type i.
if high < low or num_vals < 1.
    write: 'parameter error'.
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endif.
if last_num is initial.
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endif.
clear random_numbers[].
interval = high - low + 1.
do num_vals times.
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Reading a Random Line from a Text File

Hello,
I have a program that reads from a text file words. I currently have a text file around 800KB of words. The problem is, if I try to load this into an arraylist so I can use it in my application, it takes wayy long to load. I was wondering if there was a way to just read a random line from the text file.
Here is my code, and the text file that the program reads from is called 'wordFile'
import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
public class WordColor extends JFrame{
     public WordColor(){
          super("WordColor");
          setSize(1000,500);
          setVisible(true);
          add(new WordPanel());
     public static void main(String[]r){
          JFrame f = new WordColor();
class WordPanel extends JPanel implements KeyListener{
     private Graphics2D pane;
     private Image img;
     private char[]characterList;
     private CharacterPosition[]positions;
     private int charcounter = 0;
     private String initialWord;
     private File wordFile = new File("C:\\Documents and Settings\\My Documents\\Java\\projects\\WordColorWords.txt");
     private FontMetrics fm;
     private javax.swing.Timer timer;
     public final static int START = 20;
     public final static int delay = 10;
     public final static int BOTTOMLINE = 375;
     public final static int buffer = 15;
     public final static int distance = 4;
     public final static Color[] colors = new Color[]{Color.red,Color.blue,Color.green,Color.yellow,Color.cyan,
                                                                      Color.magenta,Color.orange,Color.pink};
     public static String[] words;
     public static int descent;
     public static int YAXIS = 75;
     public static int SIZE = 72;
     public WordPanel(){
          words = readWords();
          setLayout(new BorderLayout());
          initialWord = getWord();
          characterList = new char[initialWord.length()];
          for (int i=0; i<initialWord.length();i++){
               characterList[i] = initialWord.charAt(i);
          setFocusable(true);
          addKeyListener(this);
          timer = new javax.swing.Timer(delay,new ActionListener(){
               public void actionPerformed(ActionEvent evt){
                    YAXIS += 1;
                    drawWords();
                    if (YAXIS + descent - buffer >= BOTTOMLINE) lose();
                    if (allColorsOn()) win();
     public void paintComponent(Graphics g){
          super.paintComponent(g);
          if (img == null){
               img = createImage(getWidth(),getHeight());
               pane = (Graphics2D)img.getGraphics();
               pane.setColor(Color.white);
               pane.fillRect(0,0,getWidth(),getHeight());
               pane.setFont(new Font("Arial",Font.BOLD,SIZE));
               pane.setColor(Color.black);
               drawThickLine(pane,getWidth(),5);
               fm = g.getFontMetrics(new Font("Arial",Font.BOLD,SIZE));
               descent = fm.getDescent();
               distributePositions();
               drawWords();
               timer.start();
          g.drawImage(img,0,0,this);
     private void distributePositions(){
          int xaxis = START;
          positions = new CharacterPosition[characterList.length];
          int counter = 0;
          for (char c: characterList){
               CharacterPosition cp = new CharacterPosition(c,xaxis, Color.black);
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               counter++;
               xaxis += fm.charWidth(c)+distance;
     private void drawThickLine(Graphics2D pane, int width, int thickness){
          pane.setColor(Color.black);
          for (int j = BOTTOMLINE;j<BOTTOMLINE+1+thickness;j++){
               pane.drawLine(0,j,width,j);
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          pane.setColor(Color.white);
          pane.fillRect(0,0,getWidth(),getHeight());
          drawThickLine(pane,getWidth(),5);
          for (CharacterPosition cp: positions){
               int x = cp.getX();
               char print = cp.getChar();
               pane.setColor(cp.getColor());
               pane.drawString(""+print,x,YAXIS);
          repaint();
     private boolean allColorsOn(){
          for (CharacterPosition cp: positions){
               if (cp.getColor() == Color.black) return false;
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     private Color randomColor(){
          int rand = (int)(Math.random()*colors.length);
          return colors[rand];
     private void restart(){
          charcounter = 0;
          for (CharacterPosition cp: positions){
               cp.setColor(Color.black);
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          timer.stop();
          newWord();
     private void newWord(){
          pane.setColor(Color.white);
          pane.fillRect(0,0,getWidth(),getHeight());
          repaint();
          drawThickLine(pane,getWidth(),5);
          YAXIS = 75;
          initialWord = getWord();
          characterList = new char[initialWord.length()];
          for (int i=0; i<initialWord.length();i++){
               characterList[i] = initialWord.charAt(i);
          distributePositions();
          charcounter = 0;
          drawWords();
          timer.start();
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          timer.stop();
          pane.setColor(Color.white);
          pane.fillRect(0,0,getWidth(),getHeight());
          pane.setColor(Color.red);
          pane.drawString("Sorry, You Lose!",50,150);
          repaint();
          removeKeyListener(this);
          final JPanel p1 = new JPanel();
          JButton again = new JButton("Play Again?");
          p1.add(again);
          add(p1,"South");
          p1.setBackground(Color.white);
          validate();
          again.addActionListener(new ActionListener(){
               public void actionPerformed(ActionEvent evt){
                    remove(p1);
                    addKeyListener(WordPanel.this);
                    newWord();
     private String getWord(){
          int rand = (int)(Math.random()*words.length);
          return words[rand];
     private String[] readWords(){
          ArrayList<String> arr = new ArrayList<String>();
          try{
               BufferedReader buff = new BufferedReader(new FileReader(wordFile));
               try{
                    String line = null;
                    while (( line = buff.readLine()) != null){
                         line = line.toUpperCase();
                         arr.add(line);
               finally{
                    buff.close();
          catch(Exception e){e.printStackTrace();}
          Object[] objects = arr.toArray();
          String[] words = new String[objects.length];
          int count = 0;
          for (Object o: objects){
               words[count] = (String)o;
               count++;
          return words;
     public void keyPressed(KeyEvent evt){
          char tempchar = evt.getKeyChar();
          String character = ""+tempchar;
          if (character.equalsIgnoreCase(""+positions[charcounter].getChar())){
               positions[charcounter].setColor(randomColor());
               charcounter++;
          else if (evt.isShiftDown()){
               evt.consume();
          else{
               restart();
          drawWords();
     public void keyTyped(KeyEvent evt){}
     public void keyReleased(KeyEvent evt){}
class CharacterPosition{
     private int xaxis;
     private char character;
     private Color color;
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          xaxis = x;
          character = c;
          color = col;
     public int getX(){
          return xaxis;
     public char getChar(){
          return character;
     public Color getColor(){
          return color;
     public void setColor(Color c){
          color = c;
}

I thought that maybe serializing the ArrayList might be faster than creating the ArrayList by iterating over each line in the text file. But alas, I was wrong. Here's my code anyway:
class WordList extends ArrayList<String>{
long updated;
WordList readWordList(File file) throws Exception{
WordList list = new WordList();
BufferedReader in = new BufferedReader(new FileReader(file));
String line = null;
while ((line = in.readLine()) != null){
    list.add(line);
in.close();
list.updated = file.lastModified();
return list;
WordList wordList;
File datFile = new File("words.dat");
File txtFile = new File("input.txt");
if (datFile.exists()){
ObjectInputStream input = new ObjectInputStream(new FileInputStream(datFile));
wordList = (WordList)input.readObject();
if (wordList.updated < txtFile.lastModified()){
    //if the text file has been updated, re-read it
    wordList = readWordList(txtFile);
    ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(datFile));
    output.writeObject(wordList);
    output.close();
} else {
//serialized list does not exist--create it
wordList = readWordList(txtFile);
ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream(datFile));
output.writeObject(wordList);
output.close();
}The text file contained one random sequence of letters per line. For example:
hwnuu
nhpgaucah
zfbylzt
hwnc
gicgwkhStats:
Text file size: 892K
Serialized file size: 1.1MB
Time to read from text file: 795ms
Time to read from serialized file: 1216ms

Problem to read data from application server.

read dataset reads data only up tp 255 char.
her i want to read more data .
and i am executing that in background so i can not use gui_upload then what is the solution.

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Leonardo De Araujo

Reading Data from a SQL table to a Logical file on R/3 appl. Server

Hi All,
We would like to create Master Data using LSMW (direct Input) with source files from R/3 Application Server.
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- Ajay

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You can find lot of information about Datasets in SCN just SEARCH once.
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DATA:
BEGIN OF fs,
carrid TYPE s_carr_id,
connid TYPE s_conn_id,
END OF fs.
DATA:
itab    LIKE
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w_file TYPE char255 VALUE 'FILE',
w_file2 TYPE char255 VALUE 'FILE2'.
SELECT carrid connid FROM spfli INTO TABLE itab.
OPEN DATASET w_file FOR OUTPUT IN TEXT MODE ENCODING DEFAULT. "Opening a file in Application
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READ DATASET w_file INTO fs.
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    APPEND fs TO itab.
    OPEN DATASET w_file2 FOR APPENDING IN TEXT MODE ENCODING DEFAULT. "Appending more data to the file in the
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    TRANSFER fs TO w_file2.
    CLOSE DATASET w_file2.
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Sarves

Reading data from dynamically from different file.

Is there any function moudle or class to read data from a file in application layer, whoes structure is changing dynamically.
Urgent....... Can any one help me out in this......
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feroz.

Hi Feroz,
Do u mean that structure of the file on the application server is changing dynamically.
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LOOP AT TAB INTO WA.
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IF SY-SUBRC 0.
EXIT.
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F4_DXFILENAME_TOPRECURSION
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Edited by: Sai Krishna Kowluri on Jul 15, 2008 9:45 AM

Reading data from flat file in aplication server

hi all,
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chk this sample code.
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posnr like vbap-posnr,
matnr like vbap-matnr,
werks like vbap-werks,
megne like vbap-zmeng,
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wa_data type t_data.
open dataset p_file for output in text mode encoding default.
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write:/ 'Unable to open file:', p_file.
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do.
read dataset p_file into wa_data.
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Hi,
do like this
PARAMETERS: p_unix LIKE rlgrap-filename OBLIGATORY.
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DATA: BEGIN OF i_buffer OCCURS 0,
        line(2047) TYPE c,
END OF i_buffer.
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OPEN DATASET p_unix FOR INPUT IN TEXT MODE.
<b>IF sy-subrc NE 0.
*** Error Message "Unable to open file.
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     READ DATASET p_unix INTO v_buffer.
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        EXIT.
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     MOVE v_buffer TO i_buffer.
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Hi Experts,
I am using OPEN DATASET
READ DATASET
CLOSE DATASET to read data from the application sever. In application sever the file type is .CSV. So after reading data from application layer(AL11) to a text variable, using statement ' SPLIT AT ',' ' all the values passing into correspoding internal table fields. And it getting updated successfully into DB also.
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http://www.sapgenie.com/abap/OO/
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/b6cae890-0201-0010-ef8b-f970a9c41d47
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Transacation ABAPDOCU.

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============================================
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======================================
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=========================
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Hi
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Field3 Datatype,
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(type oracle_loader default directory mydir
access parameters (records delimited by newline fields terminated by ',')
location ('my_ext_tab.csv'))
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Hi all,
Am hitting an issue retrieving data > 8K (minus 1) stored in a CLOB column into a VARCHAR2 variable in PL/SQL...
The "problem to be solved" here is storing DDL, in this case a "CREATE VIEW" statement, that is longer than 8K for later retrieval (and execution) using dynamic SQL. Given that the EXECUTE IMMEDIATE statement can take a VARCHAR2 variable (up to 32K(-1)), this should suffice for our needs, however, it seems that somewhere in the process of converting this VARCHAR2 text to a CLOB for storage, and then retrieving the CLOB and attempting to put it back into a VARCHAR2 variable, it is throwing a standard ORA-06502 exception ("PL/SQL: numeric or value error"). Consider the following code:
set serveroutput on
drop table test1;
create table test1(col1 CLOB);
declare
cursor c1 is select col1 from test1;
myvar VARCHAR2(32000);
begin
myvar := '';
for i in 1..8192 loop
myvar := myvar || 'a';
end loop;
INSERT INTO test1 (col1) VALUES (myvar);
for arec in c1 loop
begin
myvar := arec.col1;
dbms_output.put_line('Read data of length ' || length(myvar));
exception when others then
dbms_output.put_line('Error reading data: ' || sqlerrm);
end;
end loop;
end;
If you change the loop upper bound to 8191, all works fine. I'm guessing this might have something to do with the database character set -- we've recently converted our databases over to UTF-8, for Internationalizion support, and that seems to have changed underlying assumptions regarding character processing...?
As far as the dynamic SQL issue goes, we can probably use the DBMS_SQL interface instead, with it's EXECUTE procedure that takes a PL/SQL array of varchar2(32K) - the only issue there is reading the data from the CLOB column, and then breaking that data into an array but that doesn't seem insurmountable. But this same basic issue (when a 9K text block, let's say, turns into a >32K block after being CLOBberred) seems to comes up in other text-processing situations also, so any ideas for how to resolve would be much appreciated.
Thanks for any tips/hints/ideas...
Jim

For those curious about this, here's the word from Oracle support (courtesy of Metalinks):
RESEARCH
========
Test the issue for different DB version and different characterset.
--Testing the following PL/SQL blocks by using direct assignment method(myvar := arec.col1;) on
different database version and different characterset.
SQL>create table test1(col1 CLOB);
--Inserting four CLOB data into test1.
declare
myvar VARCHAR2(32767);
begin
myvar := RPAD('a',4000);
INSERT INTO test1 (col1) VALUES (myvar);
myvar := RPAD('a',8191);
INSERT INTO test1 (col1) VALUES (myvar);
myvar := RPAD('b',8192);
INSERT INTO test1 (col1) VALUES (myvar);
myvar := RPAD('c',32767);
INSERT INTO test1 (col1) VALUES (myvar);
commit;
end;
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declare
cursor c1 is select col1, length(col1) len1 from test1;
myvar VARCHAR2(32767);
begin
for arec in c1 loop
myvar := arec.col1;
--DBMS_LOB.READ(arec.col1, arec.len1, 1, myvar);
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===================================
1. If the database characterset is WE8ISO8859P1, then the above direct assignment
method(myvar := arec.col1;) works for database version 9i/10g/11g without any
errors.
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PL/SQL: numeric or value error" when the length of the CLOB data is greater
than 8191(=8K-1). The same error can be reproduced across all database versions
9i/10g/11g.
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Cheers,
Jim C.

Without loops how can i read data from associative Array??

Hi all,
I am facing scenario like...
i need to read data from associative array without using loops is it possible,
CREATE OR REPLACE PACKAGE BODY test_pkg IS
    TYPE t1 IS TABLE OF NUMBER INDEX BY BINARY_INTEGER;
   -- in array we can expect more than one row or sometimes no data also.
FUNCTION test1(vt1 T1 DEFAULT CAST(NULL AS t1)) RETURN NUMBER IS
BEGIN
    -- basically in array we'll get data of column2
    -- this loop should satisfies table1.colum2 = nvl(NULL, table2.colum2 )if array is null.
    -- if array is not null then only compare with array values
    FOR i IN (SELECT t1.colum1,t1.column2
                     FROM table1 t1, table1 t2
                          WHERE t1.colum1 = t2.column1
                            AND t1.colum2 = nvl(vt1, t2.colum2)
      LOOP
        generateTEXT(i.colum1, i.colum2);
     END LOOP;
END test1;
END test_pkg;
in table1 we have date like...
colum1          column2
Jan                  1
Feb                  2
Mar                  3
if i call select test_pkg.test1(1) from dual then output should
be Jan..
and
select test_pkg.test1(null) from dual then it should display all elements from table1.
Jan                  1
Feb                  2
Mar                  3,
Thanks for your quick replay..

i need to read data from associative array without using loops is it possible,
No - you would need to create a SQL type and then use the TABLE operator to unnest the collection.
create or replace TYPE my_nums IS TABLE OF INTEGER;
DECLARE
-- TYPE my_nums IS TABLE OF PLS_INTEGER INDEX BY PLS_INTEGER;
v_nums my_nums := my_nums(1, 2, 3);
v_total number;
BEGIN
select sum(column_value) into v_total from table(v_nums);
DBMS_OUTPUT.PUT_LINE
    ('Sum of the numbers is ' || TO_CHAR(v_total));
END;
Sum of the numbers is 6

Read dataset - read data randomly

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