How to read specific lines from a text file using external table or any other method?

Hi,
I have a text file with delimited data, I have to pick only odd number rows and load into a table...
Ex:
row1: 1,2,2,3,3,34,4,4,4,5,5,5,,,5 ( have to load only this row)
row2: 8,9,878,78,657,575,7,5,,,7,7
Hope this is enough..
I am using Oracle 11.2.0 version...
Thanks

There are various ways to do this. I would be inclined to use SQL*Loader. That way you can load it from the client or the server and you can use a SQL*Loader sequence to preserve the row order in the text file. I would load the whole row as a varray into a staging table, then use the TABLE and MOD functions to load the individual numbers from only the odd rows. Please see the demonstration below.
SCOTT@orcl12c> HOST TYPE text_file.csv
1,2,2,3,3,34,4,4,4,5,5,5,,,5
8,9,878,78,657,575,7,5,,,7,7
101,201
102,202
SCOTT@orcl12c> HOST TYPE test.ctl
LOAD DATA
INFILE text_file.csv
INTO TABLE staging
FIELDS TERMINATED BY ','
TRAILING NULLCOLS
(whole_row VARRAY TERMINATED BY '/n' (x INTEGER EXTERNAL),
rn SEQUENCE)
SCOTT@orcl12c> CREATE TABLE staging
2    (rn         NUMBER,
3     whole_row SYS.OdciNumberList)
4 /
Table created.
SCOTT@orcl12c> HOST SQLLDR scott/tiger CONTROL=test.ctl LOG=test.log
SQL*Loader: Release 12.1.0.1.0 - Production on Tue Aug 27 13:48:37 2013
Copyright (c) 1982, 2013, Oracle and/or its affiliates. All rights reserved.
Path used:      Conventional
Commit point reached - logical record count 4
Table STAGING:
4 Rows successfully loaded.
Check the log file:
test.log
for more information about the load.
SCOTT@orcl12c> CREATE TABLE a_table
2    (rn       NUMBER,
3     data NUMBER)
4 /
Table created.
SCOTT@orcl12c> INSERT INTO a_table (rn, data)
2 SELECT s.rn,
3         t.COLUMN_VALUE data
4 FROM   staging s,
5         TABLE (s.whole_row) t
6 WHERE MOD (rn, 2) != 0
7 /
17 rows created.
SCOTT@orcl12c> SELECT * FROM a_table
2 /
        RN       DATA
         1          1
         1          2
         1          2
         1          3
         1          3
         1         34
         1          4
         1          4
         1          4
         1          5
         1          5
         1          5
         1
         1
         1          5
         3        101
         3        201
17 rows selected.

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How to read some lines from a text file using java.

hi,
i m new to java and i want to read some lines from a text file based on some string occurrence in the file. This file to be read in steps.
we only want to read the file upto the first Occurrence of "TEXT" string.
How to do it ,,,
Kinldy give the code
Regards,
Sagar
this is the text file
dfgjdjj
sfjhjkd
ghjkdg
hjkdgh TEXT
ikeyt
ujt
jk
tyk TEXT
rukl
r

Hendawy wrote:
Since the word "TEXT" is formed of 4 letters, you would read the text file 4 bytes by four bytes. Wrong on two counts. First, the file may not be encoded 1 byte per character. It could be utf-16 in which case it would be two byte per character. Second, even if it were 1 byte per character, the string "Text" may not start on a 4 byte boundary.
Consider a FileInputStream object "fis" that points to your text file. use fis.read(byte[] array, int offset, int len) to read every four bytes. Convert the "TEXT" String into a byte array "TEXT".getBytes(), and yous the Arrays class to compare the equality of the read bytes with your "TEXT".getBytes()Wrong since it relies on my second point and will fail when fis.read(byte[] array, int offset, int len) does not read 4 bytes (as is no guaranteed to). Check the Javadoc. Also, the file may not be encoded with the default character encoding.
The problem is easily solved by reading a line at a time using a BufferedReader wrapping an InputStreamReader wrapping a FileInputStream and specifying the correct character encoding.
Edited by: sabre150 on Apr 29, 2009 2:13 PM

How to read every line from a text file???

How can i read every line from my text file ("eka.txt")
now it only reads the first line and prints it out.
What is wrong with this?
import java.io.*;
import java.util.*;
class Testi{
     public static void main(String []args)throws IOException {
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File inputFile = new File ("eka.txt");
FileReader fis =new FileReader(inputFile);
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while((bis.readLine().trim() != null)) {
int spacefound=0;
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Try this code, Hope it servers your purpose.
import java.io.*;
import java.util.*;
class Testi {
     public static void main(String []args)throws IOException {
          BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
          File inputFile = new File ("Eka.txt");
          FileReader fis =new FileReader(inputFile);
          BufferedReader bis = new BufferedReader(fis);
          String test=bis.readLine();
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}Sudha

Having trouble reading specific lines from a text file and displaying them in a listbox

I am trying to read specific lines from all of the text files in a folder that are reports. When I run the application I get the information from the first text file and then it returns this error: "A first chance exception of type 'System.ArgumentOutOfRangeException'
occurred in mscorlib.dll"
Below is the code from that form.
Option Strict On
Option Infer Off
Option Explicit On
Public Class frmInventoryReport
Public Function ReadLine(ByVal lineNumber As Integer, ByVal lines As List(Of String)) As String
Dim intTemp As Integer
intTemp = lineNumber
Return lines(lineNumber - 1)
lineNumber = intTemp
End Function
Public Function FileMatches(ByVal folderPath As String, ByVal filePattern As String, ByVal phrase As String) As Boolean
For Each fileName As String In IO.Directory.GetFiles(folderPath, filePattern)
If fileName.ToLower().Contains(phrase.ToLower()) Then
Return True
End If
Next
Return False
End Function
Private Sub frmInventoryReport_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim intcase As Integer = 1
Dim strTemp, strlist, strFile As String
Dim blnCheck As Boolean = True
strFile = "Report Q" & intcase.ToString & ".txt"
Do While blnCheck = True
strFile = "Report Q" & intcase.ToString & ".txt"
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Dim allLines As List(Of String) = New List(Of String)
Do While objReader.Peek <> -1
allLines.Add(objReader.ReadLine())
Loop
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strlist = ReadLine(1, allLines) & "" & ReadLine(23, allLines)
lstInventory.Items.Add(strlist)
intcase += 1
strTemp = intcase.ToString
strFile = "Report Q" & intcase.ToString & ".txt"
blnCheck = FileMatches("E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\", "*.txt", intcase.ToString)
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Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim intcase As Integer = 1
Dim strTemp, strlist, strFile As String
Dim blnCheck As Boolean = True
strFile = "Report Q" & intcase.ToString & ".txt"
Do While blnCheck = True
strFile = "Report Q" & intcase.ToString & ".txt"
Dim objReader As New System.IO.StreamReader("E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\" & strFile)
Dim allLines As List(Of String) = New List(Of String)
Do While objReader.Peek <> -1
allLines.Add(objReader.ReadLine())
Loop
objReader.Close()
strlist = ReadLine(1, allLines) & "" & ReadLine(23, allLines)
lstInventory.Items.Add(strlist)
intcase += 1
strTemp = intcase.ToString
strFile = "Report Q" & intcase.ToString & ".txt"
blnCheck = FileMatches("E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\", "*.txt", intcase.ToString)
Loop
End Sub
End Class
Sorry I'm just beginning coding and I'm still a noob. Any help is appreciated. Thank you!

Ok, so if I'm following this correctly you should be able to just loop through all of the files in that folder whose file name matches the pattern and then read the first 22 lines, recording only the first and the last.
Exactly how you store the animal data probably depends on how you are going to display it and what else you are going to do with it. Is there anything other than name and cage number that should be associated with each animal?
You might want to make a dataset with a datatable to describe the animal, or you might write a class, or you might just use something generic like a Tuple. Here's a simple class example:
Public Class Animal
Public Property Name As String
Public Property Cage As String
Public Overrides Function ToString() As String
Return String.Format("{0} - {1}", Name, Cage)
End Function
End Class
With that you can use a routine like the following to loop through all of the files and read each one:
Dim animals As New List(Of Animal)
Dim folderPath As String = "E:\Furry Friends Animal Shelter Solution\Furry Friends Animal Shelter\"
For Each filePath As String In System.IO.Directory.GetFiles(folderPath, "Report Q?.txt")
Using reader As New System.IO.StreamReader(filePath)
Dim lineIndex As Integer = 0
Dim currentAnimal As New Animal
While Not reader.EndOfStream
Dim line As String = reader.ReadLine
If lineIndex = 0 Then
currentAnimal.Name = line
ElseIf lineIndex = 22 Then
currentAnimal.Cage = line
Exit While
End If
lineIndex += 1
End While
animals.Add(currentAnimal)
End Using
Next
'do something to display the animals list
Then you might bind the animals list to a ListBox, or loop through the list and populate a ListView. If you decided to fill a datatable instead of making Animal instances, then you might bind the resulting table to a DataGridView.
There are lots of options depending on what you want and what all you need to do.
Reed Kimble - "When you do things right, people won't be sure you've done anything at all"

How do i read complete line from a text file in j2me?????

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Read specified line from a text file

Hi,
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Thanks and regards,
Krt_Malta

Krt_malta wrote:
I am trying to read a specific line from a text file. I don't want to read all of it but just this specific line... say line number 2. Is there a method built-in in java or should I code this myself?Is there anything in your use case that precludes using the offset of the start of the line rather than the line number?

Reading one line from a text file into an array

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How to write data to text file using external tables

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Hi,
Using external table u can load the data in your local table in database,
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external table
~~~~~~~~~~~
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_7002.htm#i2153251
UTL_FILE
~~~~~~~~~
http://download-east.oracle.com/docs/cd/B19306_01/appdev.102/b14258/u_file.htm#sthref14093
Message was edited by:
Nicloei W
Message was edited by:
Nicloei W

How to read last line from a .txt file?

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Read from the beginning an discard all lines (if you have a small file), or use RandomAccessFile and scan from the end till you find the beginning of the last line.
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How do i split content from the text file using tab and spaces...?

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Jose_Noel wrote:
Hi prometheuzz,
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How to retrieve specific data from a text file

Hi, everyone
For my project it is required that a parameter file is read at the beginning, in order for certain variables to be initialized with specific values that change with the user.
At the moment, the way it is done is the following: The values at a specified sequence in a text file are read and saved in an array and the elements of the array are retrieved according to their index.
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Thank you very much.
P.S. I have attached a screenshot of the routine I am using now.
Solved!
Go to Solution.
Attachments:
read parameter file.JPG ‏180 KB

Hi panagiov,
Find attached Folders.
Method 1: in this you can search for each variable separately. You can use "Config file vis" to get all keys(Variables) at once and then you can use for loop to get their values. Or you can access individual values as shown in this code.
Method 2: here you will get all data at once. You will get Variable and Data (2D array) You need to search variables as and when required.
I hope you will understand these methods.
Best of luck
Gaurav k
CLD Certified !!!!!
Do not forget to Mark solution and to give Kudo if problem is solved.
Attachments:
Method 1.zip ‏7 KB
Method 2.zip ‏9 KB

How to read partcicular line from a txt file

in a text file let there be 50 lines
while reading the line if the line is having "name" as a string in that line then i have to store the next two consecutive lines in a string as array....
Similar way and so on......
How can we do this....

You need a BufferedReader:
http://java.sun.com/j2se/1.4.2/docs/api/java/io/BufferedReader.html
for example:try {
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How to read numeric array from a text file

I'm new to file I/O in LabView. Basically, all I need is to read the attached 2000 x 9 array into an identical 2D array within LabView. I have tried simply using the READ FROM SPREADSHEET FILE VI but it only reads the first column. Any help would be greatly appreciated.
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I cant open theother examples, so maybe I`m posting something similar, but here`s my approach in LV 6.1
First convert all double spaces to single spaces, then all single spaces to tab. Then use "Spreadsheet string to array" cutting out the first column (extra tabs produce an extra column).
Shane.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)
Attachments:
Read_in_Matlab_file(6.1).vi ‏26 KB

Retrieving certain line from a text file

Hi,
I would like to know on how to read a specific line from a text file using NetBeans IDE 6.1? Below is the content of my text file and my code.I will appreciate if anyone can help. Thank in advance= D
Matrix1.text
<matrix>
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1 2
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I would like to retrieve the interger 1,2,2,4.
MyCode.java
import java.io.IOException;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
class Matrix {
double [][] element;
static void getFile(String fileName) throws IOException{
int counter = 0;
BufferedReader br = null;
try{
br = new BufferedReader(new FileReader(fileName));
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while (line != null){
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System.out.println(line);
counter ++;
System.out.println("Total line : " + counter);
br.close();
}catch(FileNotFoundException ex){
System.out.println(ex.getMessage());
}

Wonders wrote:
Thank for reply=D
Yap the row and column will change but i had already parse these lines into my code. However, i am still figuring on how to get the integer number 1,2,2,4 of the text file using while loop and not include the "</matrix>" in the reading. Can this be done?If the numbers you want are at fixed byte positions in the file that are known ahead of time, you can use java.io.RandomAccessFile to skip to those positions. However, that seems unlikely.
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How to read specific lines from a text file using external table or any other method?

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