Inserting a newline using RandomAccessFiles

Hi,
Im trying to insert a new line halfway throug a text document using randomAccessFile but java wont allow me to use
RandomAccessFile fw = new RandomAccessFile( FileName, "rw" );
fw.seek(Pos[0]);
fw.write(System.getProperty("line.seperator"));it also wont add a new line when I use fw.writeUTF("\n");Please help Me

Bardy wrote:
Hi,
Im trying to insert a new line halfway throug a text document using randomAccessFile but java wont allow me to...It's not just Java. Your operating system stores a file as a contiguous set of bytes on a disk. There is no way, using Java or any other language, to just insert something in the middle of that.
To insert something in the middle of a text document, here's what you have to do:
1. Read the data from the original file before the insertion point and write it out to a second file.
2. Write the data you want to insert out to the second file.
3. Read the rest of the data from the original file and write it out to the second file.
4. Close all your files.
5. Delete the original file.
6. Rename the second file to have the original file's name.

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Hi All,
I want to insert multiple records on a database using a stored procedure. I wanted to insert those records using a Database Adapter and the Database adapter should be invoked by a Mediator.
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This is what I have noticed so far:
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Delete the specified character in a text file using RandomAccessFile

Hi All,
I have an invalid XML file which contains Return characters at the end of each line. I need to delete these return characters so the file becomes valid.
Does anybody have any idea how this could be done using RandomAccessFile?
I found joop_eggen's posting in this forum, modified it just a little and wanted to use it, but since the replacement character is "" (blank) it does not do what I need to.
The XML file looks like this:
<?xml version="1.0"?>
<EPMSObject>
<EPMSRecord><facilityname>KT0</facilityname><date_time>2007-06-01T00:00:00</date_time><devicetype>RPP</devicetype><devicename>RPP1A1_001.BCMF</devicename><meter>BCMF</meter><ckt_01_current>4.136000000000000e+000</ckt_01_current><ckt_02_current>0.000000000000000e+000</ckt_02_current><ckt_03_current>5.521000000000000e+000</ckt_03_current><ckt_04_current>0.000000000000000e+000</ckt_04_current><ckt_05_current>5.880000000000000e+000</ckt_05_current><ckt_06_current>0.000000000000000e+000</ckt_06_current><ckt_07_current>4.086000000000000e+000</ckt_07_current><ckt_08_current>0.000000000000000e+000</ckt_08_current><ckt_09_current>4.994000000000000e+000</ckt_09_current><ckt_10_current>0.000000000000000e+000</ckt_10_current><ckt_11_current>4.374000000000000e+000</ckt_11_current><ckt_12_current>0.000000000000000e+000</ckt_12_current><ckt_13_current>4.314000000000000e+000</ckt_13_current><ckt_14_current>0.000000000000000e+000</ckt_14_current><ckt_15_current>4.112000000000000e+000</ckt_15_current><ckt_16_current>0.000000000000000e+000</ckt_16_current><ckt_17_current>4.287000000000000e+000</ckt_17_current><ckt_18_current>0.000000000000000e+000</ckt_18_current><ckt_19_current>4.254000000000000e+000</ckt_19_current><ckt_20_current>0.000000000000000e+000</ckt_20_current><ckt_21_current>3.970000000000000e+000</ckt_21_current><ckt_22_current>0.000000000000000e+000</ckt_22_current><ckt_23_current>5.640000000000000e+000</ckt_23_current><ckt_24_current>0.000000000000000e+000</ckt_24_current><ckt_25_current>7.123000000000000e+000</ckt_25_current><ckt_26_current>0.000000000000000e+000</ckt_26_current><ckt_27_current>5.118000000000000e+000</ckt_27_current><ckt_28_current>0.000000000000000e+000</ckt_28_current><ckt_29_current>6.094000000000000e+000</ckt_29_current><ckt_30_current>0.000000000000000e+000</ckt_30_current><ckt_31_current>0.000000000000000e+000</ckt_31_current><ckt_32_current>0.000000000000000e+000</ckt_32_current><ckt_33_current>0.000000000000000e+000</ckt_33_current><ckt_34_current>0.000000000000000e+000</ckt_
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Here is joop_eggen's code:
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
public class Patch {
private static byte[] sought;
private static byte[] replacement;
private static boolean matches(MappedByteBuffer bb, int pos) {
    for (int j = 0; j < sought.length; ++j)
      if (sought[j] != bb.get(pos + j))
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private static void replace(MappedByteBuffer bb, int pos) {
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private static void searchAndReplace(MappedByteBuffer bb, int sz) {
    int replacementsCount = 0;
    for (int pos = 0; pos <= sz - sought.length; ++pos)
      if (matches(bb, pos)) {
        replace(bb, pos);
        pos += sought.length - 1;
        ++replacementsCount;
    System.out.println("" + replacementsCount + " replacements done.");
    // Search for occurrences of the input pattern in the given file
    private static void patch(File f) throws IOException {
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    int sz = (int)fc.size();
    MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_WRITE, 0, sz);
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    raf.close();
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    String E_O_L;
    E_O_L = System.getProperty( "line.separator" );
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      args = new String[] { E_O_L, "", "C:\\GTI\\EPMSRecords.xml" };
    if (args.length < 3) {
      System.err.println("Usage: java Patch sought replacement file...");
      return;
    sought = args[0].getBytes();
    replacement = args[1].getBytes();
    //if (sought.length != replacement.length) {
      // Better build-in some support for padding with blanks.
      //System.err.println("Usage: sought (" + args[0] + ") and replacement (" + args[1] + ") must have same length");
      //return;
    for (int i = 2; i < args.length; i++) {
      File f = new File(args);
try {
patch(f);
} catch (IOException x) {
System.err.println(f + ": " + x);
Thank you,
Sinan Topuz

Thank you all.
Here is what I have right now and it works very well. It takes a couple of seconds to generate the second file and that satisfies me. I took the code sabre150 posted in this forum and changed it just a little bit, so thanks to him.
I hope this helps someone.
Sinan
import java.io.*;
public class SearchReplace{
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            char lf;
            char sp;
            int indx;
            cr = '\r';
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            writer = new FileWriter(args[1]);
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        }catch (IOException e) {
            System.err.println("Caught IOException: " + e.getMessage());
        }finally {
            try {
                if ( reader!=null ) {
                    reader.close();
                if ( writer!=null ) {
                    writer.close();
            }catch (IOException e){
                System.err.println("I/O error occured while trying to close the files.");
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Hi all,
i am trying to insert multiple rows using a single insert statement like the below one.
The below one works fine..
But is there any other change that can be done in the below one without using dual...
insert all
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into ps_hd_samp (num1,num2) values (3,3)
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NiranjanSe wrote:
Hi all,
i am trying to insert multiple rows using a single insert statement like the below one.
The below one works fine..
But is there any other change that can be done in the below one without using dual...
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into ps_hd_samp (num1,num2) values (3,3)
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Table created.
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3 into ps_hd_samp (num1,num2) values (2,2)
4 into ps_hd_samp (num1,num2) values (3,3)
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3 rows created.
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      NUM1       NUM2
         1          1
         2          2
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Am getting disconnected when trying to insert.
with no error
message coming
is disconnected form oracle enterpise 10.2.0.2.0 with .. mining..
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sql is simple insert statement
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Hi Loy,
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Dim oForm As SAPbouiCOM.Form
oForm = SBO_App.Forms.Item("YourFormTypeID")
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DELETE FROM IM_INSTANCE_EXT_VAL_FRM
WHERE IEVF_TRG_FLD_NAME = 'PRAI_NUM_03'
AND IEVF_INST_CODE = 'APV-QQ-03'
AND IEVF_BLK_NAME = 'PGIT_POL_RISK_ADDL_INFO_01';
-- INSERTING into IM_INSTANCE_EXT_VAL_FRM
Insert into IM_INSTANCE_EXT_VAL_FRM (IEVF_SYS_ID,IEVF_INST_CODE,IEVF_PROG_CODE,IEVF_BLK_NAME,IEVF_TRG_FLD_NAME,IEVF_ACT_FLDS,IEVF_ACTION,IEVF_PROC,IEVF_SRNO,IEVF_ERR_NO,IEVF_ERR_YN,IEVF_APP_CODE,IEVF_REMARKS,IEVF_UPD_UID,IEVF_UPD_DT,IEVF_CR_UID,IEVF_CR_DT,IEVF_TRG_NAME,IEVF_CLEAR_FLD_YN,IEVF_VALIDATE_YN) values (IEVF_SYS_ID.NEXTVAL,'APV-QQ-03','PGIT6_03','PGIT_POL_RISK_ADDL_INFO_01','PRAI_NUM_03','PRAI_DATA_15,','ENABLED','VFB_EV_GEN.EXT_VAL_DISABLE_PHY_DAMAGE(:PGIT_POL_RISK_ADDL_INFO_01.PRAI_POL_SYS_ID,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_END_NO_IDX,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_END_SR_NO,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_LVL1_SYS_ID,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_CODE_02,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_03,:P_FLAG_OUT)',1,null,'N','01','VALIADTION',null,null,'PREMIA',
to_date('19-SEP-07','DD-MON-RR'),'WHEN-VALIDATE-ITEM','0','1');
Insert into IM_INSTANCE_EXT_VAL_FRM (IEVF_SYS_ID,IEVF_INST_CODE,IEVF_PROG_CODE,IEVF_BLK_NAME,IEVF_TRG_FLD_NAME,IEVF_ACT_FLDS,IEVF_ACTION,IEVF_PROC,IEVF_SRNO,IEVF_ERR_NO,IEVF_ERR_YN,IEVF_APP_CODE,IEVF_REMARKS,IEVF_UPD_UID,IEVF_UPD_DT,IEVF_CR_UID,IEVF_CR_DT,IEVF_TRG_NAME,IEVF_CLEAR_FLD_YN,IEVF_VALIDATE_YN) values (IEVF_SYS_ID.NEXTVAL,'APV-QQ-03','PGIT6_03','PGIT_POL_RISK_ADDL_INFO_01','PRAI_NUM_03',null,'VALIDATE','VFB_EV_GEN.EXT_VAL_VEHICLE_AGE(:PGIT_POL_RISK_ADDL_INFO_01.PRAI_POL_SYS_ID, :PGIT_POL_RISK_ADDL_INFO_01.PRAI_PSEC_SYS_ID,
''APV'',
''APV'',
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_03,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_07,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_08,
:P_FLAG_OUT,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_35_OUT) ',3,null,'N','01','VALIADTION',null,null,'PREMIA',to_date('19-SEP-07','DD-MON-RR'),'WHEN-VALIDATE-ITEM','1','1');
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:PGIT_POL_RISK_ADDL_INFO_01.PRAI_PROD_CODE,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_PSEC_SYS_ID,
''APV'',
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_03,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_07,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_CODE_03,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_CODE_02,
:P_FLAG_OUT,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_DATA_15_OUT)',2,null,'N','01','DEFAULT',null,null,'PREMIA',to_date('30-AUG-07','DD-MON-RR'),'WHEN-VALIDATE-ITEM','0','1');
Insert into IM_INSTANCE_EXT_VAL_FRM (IEVF_SYS_ID,IEVF_INST_CODE,IEVF_PROG_CODE,IEVF_BLK_NAME,IEVF_TRG_FLD_NAME,IEVF_ACT_FLDS,IEVF_ACTION,IEVF_PROC,IEVF_SRNO,IEVF_ERR_NO,IEVF_ERR_YN,IEVF_APP_CODE,IEVF_REMARKS,IEVF_UPD_UID,IEVF_UPD_DT,IEVF_CR_UID,IEVF_CR_DT,IEVF_TRG_NAME,IEVF_CLEAR_FLD_YN,IEVF_VALIDATE_YN) values (IEVF_SYS_ID.NEXTVAL,'APV-QQ-03','PGIT6_03','PGIT_POL_RISK_ADDL_INFO_01','PRAI_NUM_03',null,'VALIDATE','VFB_EV_GEN.EXT_VAL_PHY_DAMAGE(:PGIT_POL_RISK_ADDL_INFO_01.PRAI_POL_SYS_ID,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_END_NO_IDX,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_END_SR_NO,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_LVL1_SYS_ID,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_CODE_02,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_NUM_03,
:P_FLAG_OUT,
:PGIT_POL_RISK_ADDL_INFO_01.PRAI_DATA_15_OUT)',9,null,'N','01','VALIADTION',null,null,'PREMIA',
to_date('19-SEP-07','DD-MON-RR'),'WHEN-VALIDATE-ITEM','1','1');
script which is taken from Sql Developer and got error while running in SQL* PLUS
Following error was raised on running the script in SQL * PLUS
5 rows deleted.
1 row created.
1 row created.
1 row created.
SP2-0734: unknown command beginning ":P_FLAG_OU..." - rest of line ignored.
SP2-0734: unknown command beginning ":PGIT_POL_..." - rest of line ignored.
SP2-0734: unknown command beginning "to_date('1..." - rest of line ignored.

How to append to next line using RandomAccessFile writeBytes

Hi,
How do you append to the next line using RandomAccessFile with writeBytes()
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Thanks,
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At this point there is no next line or return key in SMS or BBM, a lot of people have asked for it. It exists on all the other apps for writing, but not on SMS and BBM. Hopefully BB releases this simple fix for the messaging..

Get all object using RandomAccessFile

hi friends,
i have one log file and this log file contain some object. and i am used Serializable Interface.
i know basically object are not readable format, but consider log file(logInfo.log) contain some object like:
12 javasun
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38 java
96 sun
like wise
am using RandomAccessFile class and this my
raf.writeInt(baos.size());
raf.write(baos.toByteArray());
raf.seek(0);
int a = 0;
while(true)
a = raf.readInt();
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byte[] b = new byte[a+4];
int x=(int)raf.getFilePointer();
System.out.println("file Pointer : " + x);
raf.read(b,x,a);
ByteArrayInputStream bais = new ByteArrayInputStream(b,x,a);
ObjectInputStream ois = new ObjectInputStream(bais);
Record rec = (Record)ois.readObject(); //here record is object
System.out.println("The object : "+rec.getAttributes());
using this code i got below result
12 javasun
but i can't get all object from the file(logInfo.log)
how can i get all object? help me!!!...
Thank You

ok, sir
i tried and i got all object from the file. Thank
you,
and,
if i need last two object from file(logInfo.log)
like
38 java
96 sun
how can i get? please give some clue or code
Thank youSince you don't have a set size for the objects, then you will have to read through the entire file always keeping the last two objects, and as soon as the read fails return them.
As I said in your first thread, however, you would be much better off writing the objects with a set size (i.e. calling ByteArrayOutputStream(size) with a single max size rather than ByteArrayOutputStream( ) ) as you would then be able to use seek adding 4 (for the int) to size and multiplying by the position of the recordset you want to read (0 for the first). You would then, also be able to overwrite records and the such (which is the usually one of the main reasons for using something like RandomAccessFile, i.e. creating a Flat DB-Like File).
Edit:
And you would probably lose the int, then anyway (when using a set size), as it wouldn't be needed.

Differnce between using RandomAccessFile and Outputstream

Hi,
I'm implementing a download manager , i read some source using RandomAccessFile and the other using Outbutstream and buffedOutputstream
so any one can give me a quick summary between them and which is better ?

BigDaddyLoveHandles wrote:
sabre150 wrote:
BigDaddyLoveHandles wrote:
BigDaddyLoveHandles wrote:
It's useless to speculate about unseen code written by an unknown hand.That's my {color:green}Phrase Of The Day.{color}Interesting that I also used the word 'speculate' but my brain must be slower than yours since I was a minute behind you!Don't you know that on Fridays it's useless trying to keep up with me? I wear my Ninja outfit!:-) I'm surprised you can get one that fits!

The concurrent io problem when using RandomAccessFile

Hi:
In my application,I have to export the tomcat log(the log file like "localhost_access_log.2010-10-13") to database and the do some analisis.
My way:
start to export log at 00:05:00 every day,at this moment just read the log whose date before yesterday.
For example,at 2010-12-12 00:05:00,the log of 2010-12-11... 2010-12-01 ..2010-11-12...(just check the nearest 30 days).
All of these data are put into one table named "log".
If log of one day is exported successfully,insert one record to another table named 'logrecord'.
//main code fragment:
     public void start() {
          //start the push export work once the server startup.
          run();
          //start the schedule work
          new ScheduledThreadPoolExecutor(5).scheduleAtFixedRate(this, getStartTime(), 24 * 3600,
                    TimeUnit.SECONDS);
     //return the left time(from now to 00:05:00 of tomorrow)
     private long getStartTime() {
          Date d = new Date();
          long t = (DateUtil.getNextDayAtMiddleTime(d).getTime() - d.getTime()) / 1000 + 300;
          return t;
     @Override
     public void run() {
          Date days[] = DateUtil.getSeveralDayRangeByTime(30); //just the nearest 30 days.
          for (Date d : days) {
               if (exist(d)) {
                    continue;
               exportLogByDate(d);
It works for now expect we can not anlyzer data of today.
However we need it now.
As far as I thought,I want to create a new table which owns the same structure of the former table "log" used to hold the log of "today" only.
At 00:05:00 of every day,after the normal log exporting(export the nearest 30 days'log but today),export the log of today.
It sounds easy,read the content,parser,filter,insert,just like what I did.
But,the tomcat log file is saved by day.So in my normal log exporting,the log file(nearest 30 days) are not be used by tomcat,I can open/close it as I like.
However if I tried to read the log of today,since the log file maybe used by tomcat for inserting log.
I prefer to use the RandomAccessFile to read the log of today:
But I am coufused by the concurrent io problem:what is going on if I am reading a line while tomcat is writing the line?
Here is my test exmaple:
package com.test;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
import org.junit.BeforeClass;
import org.junit.Test;
public class TestMain {
     private static File          file;
     private static long          pos; //record the position of last time
     private static Thread     writterThread;
     @BeforeClass
     public static void init() {
          file = new File("D:/random.txt");
          // build the thread for simulating the tomcat write log
          writterThread = new Thread(new Runnable() {
               @Override
               public void run() {
                    FileWriter fw;
                    try {
                         fw = new FileWriter(file);
                         BufferedWriter bw = new BufferedWriter(fw);
                         int i = 0;
                         while (true) {
                              i++;
                              bw.append(i + " added to line...");
                              bw.append("\r\n");
                              bw.flush();
                              Thread.sleep(5000);
                    } catch (IOException e) {
                         e.printStackTrace();
                    } catch (InterruptedException e) {
                         e.printStackTrace();
     @Test
     public void testRandomRead() throws IOException, InterruptedException {
          writterThread.start();
          try {
               RandomAccessFile raf = new RandomAccessFile(file, "r");
               String line;
               while ((line = raf.readLine()) != null) {
                    System.out.println(line);
               pos = raf.getFilePointer();
               raf.close();
               // read the file by 30 seconds within 2 min,just for test)
               for (long m = 0; m < 1000 * 60 * 2; m += 30000) {
                    raf = new RandomAccessFile(file, "r");
                    raf.seek(pos);
                    while ((line = raf.readLine()) != null) {
                         System.out.println(line);
                    pos = raf.getFilePointer();
                    raf.close();
                    Thread.sleep(30000);
          } catch (FileNotFoundException e) {
               e.printStackTrace();
The normal output is something like:
1 added to line...
2 added to line...
3 added to line...
4 added to line...
5 added to line...
However I always get the following output:
1
added to line...
2 added to line...
3 added to line...
4 added to line...
5
added to line...
That's to say,the RandomAccessFile is reading the line which has not been completed by tomcat.
So,I have two questions now:
1) How about my normal log exporting? Is there anything can be improved?
2) How to slove the concurrent io problem when export log of today?

Peter Lawrey wrote:
You can;
- check the length to see if it has grown since the last time it was written to. If it has shrunk, start from the start of the file.
- if longer, open the file from the last point read.
- read the text up to the last newline in the file. (might be no new lines)
- close the file and remember where you were up to. (the start of the last incomplete line.
- wait a bit and repeat.But how to decide if one line is completed?
Also,how about if the randomaccessfile can not stop?
For example,start the work at 02:00,it read the tomcat log file line by line and export them to db,and during this time,the tomcat keep writing log to the same file(user request the server all the time), and then the randomaccessfile will keeping reading accordingly,when it is 03:00,the last task is not completed,but a new task should start,how to control this?

How to insert a number using ADO or OLEDB by oracle provider

I create a talbe .
Create Table A
(id number(7));
I use ADO to access the table a;
_ConnectionPtr pConn=NULL;
pConn.CreateInstance(__uuidof(Connection));
_RecordsetPtr pRst=NULL;
pRst.CreateInstance(__uuidof(Recordset));
pConn->Provider="OraOLEDB.Oracle.1";
try
     pConn->Open("","ISVISION","ISVISION",NULL);
     pRst->CursorLocation=adUseClient;
     pRst->Open("A",pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdTable);
     pRst->AddNew();
     pRst->Fields->Item[0L]->Value=100L;
//It raise a exception,why?
//If I convert the datetype of "ID" to CHAR(7)
//and pRst->Fields->Item[0L]->Value=L"100",it is ok.
     pRst->Update();
     pRst->Close();
     pConn->Close();
catch (_com_error& e)
     MessageBox(e.Description(),"error",MB_OK|MB_ICONWARNING);
     return ;
if (pConn)
pConn.Release();
if (pRst)
pRst.Release();
I create a table Aã
create table A
     ID number(7)
Now ,I use OLE DB to access the table A;
struct CIsA
     CIsA()
          memset(this, 0, sizeof(*this));
public:
     DB_NUMERIC m_ID;
     BEGIN_COLUMN_MAP(CIsA)
          COLUMN_ENTRY_PS(1, 7, 0, m_ID)
     END_COLUMN_MAP()
DEFINE_COMMAND(CIsA, _T("SELECT ID FROM A"))
CDataSource DataSource;
HRESULT hrt=DataSource.Open(_T("OraOLEDB.Oracle.1"),NULL,_T("ISVISION"),_T("ISVISION"));
CSession Session;
hrt=Session.Open(DataSource);
CDBPropSet propset(DBPROPSET_ROWSET);
propset.AddProperty(DBPROP_IRowsetChange, true);
propset.AddProperty(DBPROP_UPDATABILITY,
     DBPROPVAL_UP_INSERT | DBPROPVAL_UP_CHANGE | DBPROPVAL_UP_DELETE);
CCommand<CAccessor<CIsA> > Command;
Command.Open(Session,NULL,&propset);
tcscpy((TCHAR*)Command.mID.val,_T("1245"));
Command.m_ID.sign=1;
hrt=Command.Insert();//It is wrong,why?
Command.Close();
Session.Close();
DataSource.Close();
In Fact,the two problems is the same. The key of problem is how to insert a number into oracle.
help me! thank you.

hi
create a table something like this.
create table image(
Image_Id number(5),
Image    blob);create a form with the same table and use the following code.
when-button-pressed trigger.
read_image_file('c:\image_name.jpg' , 'jpg' , 'image.image');if its correct/helpful please mark it thanks.
sarah

Inserting a newline using RandomAccessFiles

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