How to write several kind of data in a DatagramPacket

hi all,
I would like to write the following data in a datagrampacket:
two int and one long values.
How to write those different kind of data in the same packet?
then receive how to read the datagrampacket ?
anybody can provide a sample ?
Thanks!

int num1 = 1;
int num2= 2;
long num3=119451504657036;
ByteArrayOutputStream OutputStream = new ByteArrayOutputStream();
    DataOutputStream outPutdata = new DataOutputStream(OutputStream );
    try {
      outPutdata.writeLong(num3);
      outPutdata.write(num1 );
       outPutdata.write(num2 );
    } catch (IOException e1) {
       e1.printStackTrace();
DatagramPacket out = new DatagramPacket(OutputStream .toByteArray(),i have add DatagramPacket , but how to read it ?
byte[] inbuf = new byte[24];
          DatagramPacket intPacket = new DatagramPacket(inbuf, inbuf.length);
ByteArrayInputStream bin = new ByteArrayInputStream
                     (intPacket .getData());
                    and then ...????? how to do ? can you give me more tip ?

Similar Messages

Write several kind of data in a DatagramPacket

I would like to write the following data in a datagram packet:
two int and one long values.
How to write those different kind of data in the same packet?
I guess to read them it will be something like:
InputStream in = new ByteArrayInputStream(packet.getData(),
packet.getOffset(),
packet.getLength());
DataInputStream din = new DataInputStream(in);
int IDreq = (din.readInt()).intValue();
int IDreq = (din.readInt()).intValue();
long tsreq = (din.readLong()).longValue();

I am using UDP: I use DatagramSocket over a
DatagramSocket.
for the first 2$ question, it would be something
like:
OutputStream out = new ByteArrayOutputStream();
DataOutputStream dout = new
new DataOutputStream(out);
try{
dout.writeInt(id);
dout.writeInt(CS);
dout.writeLong(date.getTime());
catch(IOException e){
e.printStackTrace();
and then...? how do I get the bytes, or link it to my
DatagramPacket whose constructor ask a byte[] buf as
argument.Yes this is correct, except you need a ByteArrayOutputStream variable reference. so
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream( baos );
dos.write......
dos.flush(); //CRITICAL!!!!
byte[] b = baos.toByteArray();
then you can use b!

Can any one please tell me how to write labview program for data logging in electric motor bike.

Can any one please tell me how to write labview program for data logging in electric motor bike. I am going to use CompactRIO for getting wide range of data from various sensors in bike. I need to write labview program for data logging of temperature, voltage and speed of the bike. Can any one help me?

Yes, we can.
I think the best place for you to start for this is the NI Developer Zone. I recommend beginning with these tutorials I found by searching on "data log rio". There were more than just these few that might be relevant to your project but I'll leave that for you to decide.
NI Compact RIO Setup and Services -> http://zone.ni.com/devzone/cda/tut/p/id/11394
Getting Started with CompactRIO - Logging Data to Disk -> http://zone.ni.com/devzone/cda/tut/p/id/11198
Getting Started with CompactRIO - Performing Basic Control -> http://zone.ni.com/devzone/cda/tut/p/id/11197
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Jason
Wire Warrior
Behold the power of LabVIEW as my army of Roomba minions streaks across the floor!

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Just wonder in BPC 7.0/7.5 MS how do you write custom messages to Data Manager package log from within SSIS? I mean I want to log output of specific custom tasks (non-BPC) in SSIS control flow to the resultant BPC package log created when running SSIS package in Data Manager. Can this be done in a Script Task or some other way? Not much documentation out there on this.
Thanks,
Brian

Hi Brian
In order to achieve what you want, it can get tricky in your package, ultimately It would depend on the task, for example if you had an execute SQL task, you could use a RAISEERROR command in your SQL statement and BPC would return the error message that you specified.
If you had other tasks, then it would be a bit more tricky, you would have to have custom messages based on event handlers.
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[Custom messages for logging|http://msdn.microsoft.com/en-us/library/ms345174.aspx]
[Custom Logging Using Event Handlers |http://consultingblogs.emc.com/jamiethomson/archive/2005/06/11/SSIS_3A00_-Custom-Logging-Using-Event-Handlers.aspx]
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Kind Regards
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Thanks
Philip

Assuming your 10 parameters are an numeric array with 10 elements, use "write to spreadsheet" file with append set to true. (... and if they are scalars, built the array first ).
LabVIEW Champion . Do more with less code and in less time .

How to write Validations for Sample Data??

Hi Frnds,
I want to know how to write validations for sample oracle data?? Can anyone explain anyone clearly??
Regards,
Raj

Hi shushma,
Simply put a check that:
If(wdContext.current<YOUR_NODE>Element().get<YOUR_ATTRIBUTE_NAME> !=null){
else{
// Show the error messages
//Displaying the error message is very easy.
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I hope this helps! if you need ay further help please let me know.
Thanks and Regards,
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How to write more than 65536 data in excel Via Labview in one column

I have more than 65536 data and i want to write these data in excel sheet. It is giving Error:-
"Description:-
Error -2146827284 occurred at an unidentified location
This error code is undefined. No one has provided a description for this code, or you might have wired a number that is not an error code to the error code input."
Less than 65536 data can be written....
Please give some solution...

This is not a limitation of LabVIEW writing to a spreadsheet file but a limitation of Microsoft Excel (and also of Notepad) itself.
One option could be, you can switch to Excel 2007 or higher verison...!!
Other solution could be, forget about writing to Excel, instead write in some other format and use LabVIEW your other compatible (with large data) application to read it back.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

How to write python code in Data Services ?

I read that you can use python programming to do tasks that custom SAP Data Services Designer components cannot do. Here is the link for that -
SAP Data Services/BODS equivalent of Microsoft SSIS Script Task
I don't know where I can type my code in DS / BODS. I see a script in the designer window, but it has nothing to do with python. Can someone show me
where it is and how to do programming in SAP DS ?
In SSIS, creating a script with programming language is very easy. Just drag and drop the Script component and start coding right away.
Unfortunately, SAP does not seem to be so simple.

Hi Terry,
There is simple solution provided by Ramesh Murugan then why do you want go for hard way !! Not sure your intention
For your questions
Can we do the ENTIRE etl in python ?
Not sure but I didn't get any complicated scenarios so for and also we need to consider performance as well
Challenge with some complicated scenarios with BODS !! We happy to provide solutions
But every tool has unique capability !!
Regards,
Manoj

How to write control file below data

Hi,
Here is my table
create table sample1 (name varchar2(5), num number(2));
sample.txt(Datafile)
vikram12
sharma13
sonu 14
Here is my control file
load data
infile 'C:\sample.txt'
into table sample1
fields terminated by "," optionally enclosed by '"'
( name char(5), num char(2) )
But it rejecting all the records. Just let me know where i went wrong.
Thanks in advance

fields terminated by "," optionally enclosed by
'"' As per your control file, the fields have to be seperated by commas but in your datafile it is seperated by space. Either change the delimiter in your control file or in your datafile
Using Comma Seperated file,
sample.txt(Datafile)
vikram,12
sharma,13
sonu, 14
load data
infile 'C:\sample.txt'
into table sample1
fields terminated by ","
optionally enclosed by '"'
( name char(5),
num char(2)
)Note:
1. You have to increase the length of name column as your datafile has values greater than 5 characters. First and second records will be rejected with NAME VARCHAR2(5)

How to write empty line in text file

hey
i want to insert one empty line in text file.
how to write this.
i declared
data: emptyrec(240) type c value space,
and used
TRANSFER emptyrec to e_file.
but its not inserting empty line in the record.
is there any special way have to do.
ambichan.

hai anand,
I am posting the code snippet.
i have commented that transfer line in '----
' like this
pls refer below.
ambichan
DATA: PAGENO(4) TYPE N VALUE 1,
      DATAKBN(2) TYPE N VALUE 1,
      SUBNO(3) TYPE N VALUE 1,
      VPAGENO(4) TYPE C,
      VDATAKBN(2) TYPE C,
      VSUBNO(3) TYPE C,
      VREC(255) TYPE C,
      VRECORD(255) TYPE C,
      EMPTYREC(255) TYPE C VALUE SPACE,
      VCODE(10) TYPE C,
      VNAME2(35) TYPE C,
      VPAYDAT(10) TYPE C,
      VSGTXT(60) TYPE C VALUE SPACE,
      VSGTXT1(10) TYPE C,
      VKINGAKU(15) TYPE C VALUE SPACE,
      VBIKKO(30) TYPE C VALUE SPACE,
      VBELNR(10) TYPE C VALUE SPACE,
      VDMBTR(15) TYPE C,
      VGLT0-KSLVT(15) TYPE C,
      VGLT0-TSL01(15) TYPE C,
      VGLT0-TSL02(15) TYPE C,
      VGLT0-TSL03(15) TYPE C,
      VGLT0-TSL04(15) TYPE C,
      VGLT0-TSL05(15) TYPE C,
      VKIN(15) TYPE C,
      VTEGA(15) TYPE C.
FORM FRM_OUTPUT_DATA.
SORT ITAB_OUTPUT_SUMMARY BY LIFNR DTYPE.
SORT ITAB_OUTPUT_ITEMS   BY LIFNR DTYPE BELNR.
IF P_DISP = 'X'."checkボクスを選ぶ場合、ファイル作成処理へ行く
OPEN DATASET E_FILE FOR OUTPUT IN TEXT MODE.
IF SY-SUBRC <> 0.
WRITE: 'error',SY-SUBRC.
EXIT.
ENDIF.
LOOP AT ITAB_LIFNR.
PERFORM LISTDATA.
PAGENO = PAGENO + 1.
SUBNO = 1.
ENDLOOP.
CLOSE DATASET E_FILE."ファイルクローズ
ENDFORM.                               " End of frm_output_data
FORM LISTDATA.
DATA:
    WK_PAY_AMOUNT LIKE BSEG-DMBTR,   " 純支払額算出用
    VWK_PAY_AMOUNT(15) TYPE C,
    GLT0-TSL05_VAL LIKE GLT0-TSL05.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 1.
BSIK-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
GLT0-TSL01 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 2. " 区分：2
GLT0-TSL02 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 3. " 区分：3
GLT0-TSL03 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 4. " 区分：4
GLT0-TSL04 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 5. " 区分：5
GLT0-TSL05 = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
glt0-tsl05 = glt0-tsl05 + glt0-tsl04.
WK_PAY_AMOUNT = GLT0-TSL05 + GLT0-TSL04.
CHECK WK_SUBRC = 0.
BSEG-KOART = ' '.                    情報不要
CLEAR: BSEG-SGTXT, BSEG-DMBTR, TGSBT-GTEXT, BKPF-BELNR.
BSEG-KOART = 'Y'.                    " フラグ：ヘッダに相殺額を出力
CLEAR: BSAK-DMBTR.
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 6. " 区分：6
BSAK-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSAK-DMBTR.
WRITE : / PAGENO,
           SUBNO,
           DATAKBN,
           ITAB_LIFNR-LIFNR,
           ITAB_LIFNR-NAME2(25),
           P_PAY_T,
           GLT0-TSL01,
           GLT0-TSL02,
           GLT0-TSL03,
           GLT0-TSL04,
           GLT0-TSL05.
VPAGENO = PAGENO.
VSUBNO = SUBNO.
DATAKBN = 1.
VDATAKBN = DATAKBN.
VCODE = ITAB_LIFNR-LIFNR.
VNAME2 = ITAB_LIFNR-NAME2.
VPAYDAT = P_PAY_T.
VGLT0-TSL01 = GLT0-TSL01.
VGLT0-TSL02 = GLT0-TSL02.
VGLT0-TSL03 = GLT0-TSL03.
VGLT0-TSL04 = GLT0-TSL04.
VGLT0-TSL05 = GLT0-TSL05.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT VKINGAKU
VBIKKO VBELNR VGLT0-TSL01 VGLT0-TSL02 VGLT0-TSL03
VGLT0-TSL04 VGLT0-TSL05 INTO VREC SEPARATED BY ','.
CLEAR: BSAK-DMBTR, BSID-DMBTR, BSAD-DMBTR, BSEG-DMBTR, BSIK-DMBTR,
         WK_10 , WK_11 , GLT0-TSL05.
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 7. " 区分：7
BSID-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSID-DMBTR.
郵送料の出力処理
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 8. " 区分：8
BSAD-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSAD-DMBTR.
READ TABLE ITAB_OUTPUT_SUMMARY
       WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 9. " 区分：9
BSEG-DMBTR = ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - BSEG-DMBTR.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 10.
WK_10 =     ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
READ TABLE ITAB_OUTPUT_SUMMARY
         WITH KEY   LIFNR = ITAB_LIFNR-LIFNR DTYPE = 11.
WK_11 =     ITAB_OUTPUT_SUMMARY-DMBTR * WK_RATIO.
GLT0-TSL05 =   WK_PAY_AMOUNT - WK_10 - WK_11.
WK_PAY_AMOUNT = WK_PAY_AMOUNT - GLT0-TSL05.
   VWK_PAY_AMOUNT = WK_PAY_AMOUNT.
   VKIN = WK_10.
   VTEGA = WK_11.
   CONCATENATE VREC VWK_PAY_AMOUNT VKIN VTEGA INTO
         VRECORD SEPARATED BY ','.
   TRANSFER VRECORD TO E_FILE.
    WRITE :
            VWK_PAY_AMOUNT,
            WK_10,
            WK_11.
   WRITE:/.
BSEG-KOART = 'X'.                   " フラグ：請求金額を出力
LOOP AT ITAB_OUTPUT_ITEMS WHERE LIFNR = ITAB_LIFNR-LIFNR
                            AND   DTYPE = 5.          " 区分：5
    BSEG-SGTXT   = ITAB_OUTPUT_ITEMS-SGTXT.          " 明細テキスト
    GLT0-KSLVT   = ITAB_OUTPUT_ITEMS-DMBTR * WK_RATIO.     " 金額
    TGSBT-GTEXT = ITAB_OUTPUT_ITEMS-GTEXT.              BKPF-BELNR   = ITAB_OUTPUT_ITEMS-BELNR.
   SUBNO = SUBNO + 1.
   VSUBNO = SUBNO.
   DATAKBN = 2.
   VDATAKBN = DATAKBN.
   VGLT0-KSLVT = GLT0-KSLVT.
   VBIKKO = TGSBT-GTEXT.
   VBELNR = BKPF-BELNR.
   VSGTXT1 ='請求金額:'.
   CLEAR VRECORD.
CONCATENATE VSGTXT1 BSEG-SGTXT INTO VSGTXT.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VGLT0-KSLVT VBIKKO VBELNR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
   WRITE :/ VPAGENO,VSUBNO,VDATAKBN,'請求金額:', VSGTXT, VGLT0-KSLVT,
            VBIKKO,VBELNR.
ENDLOOP.
CLEAR: BSEG-SGTXT,GLT0-KSLVT,BKPF-BELNR.
LOOP AT ITAB_OUTPUT_ITEMS WHERE LIFNR = ITAB_LIFNR-LIFNR
                            AND   DTYPE = 6.          " 区分：6
    BSEG-SGTXT   = ITAB_OUTPUT_ITEMS-SGTXT.          " 明細テキスト
    IF ITAB_OUTPUT_ITEMS-SHKZG = CNS_CREDIT.       " 金額
      GLT0-KSLVT = ITAB_OUTPUT_ITEMS-DMBTR * WK_RATIO.
    ELSEIF ITAB_OUTPUT_ITEMS-SHKZG = CNS_DEBIT.
      GLT0-KSLVT = ITAB_OUTPUT_ITEMS-DMBTR * WK_RATIO * -1.
    ENDIF.
TGSBT-GTEXT = ITAB_OUTPUT_ITEMS-GTEXT.          " 事業領域テキスト
BKPF-BELNR   = ITAB_OUTPUT_ITEMS-BELNR.          " 伝票番号
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
DATAKBN = 3.
VDATAKBN = DATAKBN.
VGLT0-KSLVT = GLT0-KSLVT.
VBIKKO = TGSBT-GTEXT.
VBELNR = BKPF-BELNR.
VSGTXT1 ='相殺金額:'.
CLEAR VRECORD.
CONCATENATE VSGTXT1 BSEG-SGTXT INTO VSGTXT.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VGLT0-KSLVT VBIKKO VBELNR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
concatenate vpageno vsubno vdatakbn
WRITE :/ PAGENO,SUBNO,DATAKBN,'相殺金額',BSEG-SGTXT, GLT0-KSLVT,
         TGSBT-GTEXT, BKPF-BELNR.
ENDLOOP.
   CLEAR VRECORD.
*Insert empty line.
TRANSFER EMPTYREC TO E_FILE.
DATAKBN = 3.
VDATAKBN = DATAKBN.
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT ='源泉金額'.
VDMBTR = BSID-DMBTR.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
WRITE :/ PAGENO, SUBNO,DATAKBN, ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
         P_PAY_T,'源泉金額', BSID-DMBTR.
CLEAR: VDMBTR, VSGTXT, VRECORD.
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT = '郵送料'.
VDMBTR = BSAD-DMBTR.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
WRITE :/ PAGENO, SUBNO,DATAKBN,ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
         P_PAY_T,'郵送料', BSAD-DMBTR.
CLEAR: VDMBTR, VSGTXT, VRECORD.
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT = '振込み手数料'.
VDMBTR = BSEG-DMBTR.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
CLEAR: VDMBTR, VSGTXT, VRECORD.
WRITE :/ PAGENO,SUBNO,DATAKBN,ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
        P_PAY_T,'振込み手数料',BSEG-DMBTR.
*その他の支払いの処理
SUBNO = SUBNO + 1.
VSUBNO = SUBNO.
VSGTXT = 'その他の支払い'.
VDMBTR = GLT0-TSL05.
CONCATENATE VPAGENO VSUBNO VDATAKBN VCODE VNAME2 VPAYDAT VSGTXT
VDMBTR INTO VRECORD SEPARATED BY ','.
TRANSFER VRECORD TO E_FILE.
WRITE :/ PAGENO,SUBNO,DATAKBN,ITAB_LIFNR-LIFNR,ITAB_LIFNR-NAME2,
        P_PAY_T, 'その他の支払い',GLT0-TSL05.
                                 glt0-tsl05.
ULINE.
CLEAR: VREC, VRECORD,VCODE,VNAME2,VPAYDAT,VSGTXT,VSGTXT1,VKINGAKU.
CLEAR: VBIKKO,VBELNR,VDMBTR,VGLT0-KSLVT,VGLT0-TSL01,VGLT0-TSL02.
CLEAR: VGLT0-TSL03,VGLT0-TSL04,VGLT0-TSL05,VKIN,VTEGA,VWK_PAY_AMOUNT.
ENDFORM.

How to parse this kind of XML documents and store in a relational tables

Can u guys help me out ,..how to parse these kind of XML documents..like under PR there Sr,CreationDate and DoBID.. Again under Sr...there are LD, CID,TID, RID and so on.....
so how to parse this kind of data..how to create the structure of the table....pls help me out..
<nk8:PR>
          <nk8:Sr>
               <nk8:LD>---------</nk8:LID>
               <nk8:CID>---------</nk8:CID>
               <nk8:TID>---------</nk8:TID>
               <nk8:RID>---------</nk8:RID>
               <nk8:CC>OnError</nk8:CC>
               <nk8:AID>---------</nk8:AID>
          </nk8:Sr>
          <nk8:CreationDateTime>2002-07-01</nk8:CreationDateTime>
          <nk8:DOBID>---------</nk8:DOBID>
     </nk8:PR>
     <ssm:ER>
          <ssm:PN>---------</ssm:PN>
          <ssm:SN>---------</ssm:SN>
          <ssm:SCt>---------</ssm:SC>
          <ssm:IA>
               <ssm:NT>---------</ssm:NT>
               <nk8:LID>---------</nk8:LID>
               <nk8:CID>---------</nk8:CID>
               <ssm:AN>---------</ssm:AN>
          </ssm:A>
     </ssm:ER>
     </nk8:PR>

First, your XML document is not well formatted. Once you're done with that you can extract the values and store it in a table column.
sql> WITH xml_table AS
2 (SELECT XMLTYPE(
3 '
4 <nk8:PR xmlns:nk8="http://www.w3.org">
5 <nk8:Sr>
6 <nk8:LID>LID Value</nk8:LID>
7 <nk8:CID>CID Value</nk8:CID>
8 <nk8:TID>TID Value</nk8:TID>
9 <nk8:RID>RID Value</nk8:RID>
10 <nk8:CC>OnError</nk8:CC>
11 <nk8:AID>---------</nk8:AID>
12 </nk8:Sr>
13 </nk8:PR>') XMLCOL FROM DUAL)
14 SELECT extractvalue(t.column_value,'//nk8:LID','xmlns:nk8="http://www.w3.org"') "LID",
15   extractvalue(t.column_value,'//nk8:CID','xmlns:nk8="http://www.w3.org"') "CID",
16   extractvalue(t.column_value,'//nk8:RID','xmlns:nk8="http://www.w3.org"') "RID",
17 extractvalue(t.column_value,'//nk8:CC','xmlns:nk8="http://www.w3.org"') "CC"
18 FROM xml_table, table(xmlsequence(extract(xmlcol,'/nk8:PR/nk8:Sr','xmlns:nk8="http://www.w3.org"'))) t;
LID        CID        RID        CC
LID Value CID Value RID Value OnError

Best way how to write FPGA data in rt cRIO system in tdms file

Hej,
I am struggling to write measured data from an analog input (NI 9215) sampled at up to 20 kHz to a tdms file in the rt system (crio-9022). I just need to save several periods of 4 arbitrary analog signals at frequencies between 5 Hz and 1KHz. So storing up to 50k values should already be enough.
I use a high priority and a low priority loop. First I tried to adapt the example from the "Getting Started with CompactRIO - Logging Data to Disk" (http://zone.ni.com/devzone/cda/tut/p/id/11198). But when I used this in my high priority loop (running at 1ms), the loop runs out of time and the rt system becomes unresponsible. If I change the number of elements to write (the number of elements to wait for in the fifo read block) it becomes better, but still data is lost because the loop finishes late.
So I was thinking to create a RT fifo and to store all the values from the measurement first in this memory inside the high priority loop and then write the values to the tdms file in the low priority loop. This time I used the read/write fpga block instead of the FPGA fifo block. It was already working better but writing the files to the tdms file took a lot of time since each value was read and written to the tdms file individually. Unfortunately I could not find a possibility how to write the whole rt fifo to the tdms file at once. Is there a block available or is it possible to create a big array first and then write the data to the tdms file at once? My code I tried is in this second picture.
I hope someone can give me some tips which method should be better for my project and a hint what I did wrong or what I can optimize. I stucked for days now on how to save my measurements on the cRIO system.
Thank you very much in advance. Have a nice weekend.
Best regards
Andy
Solved!
Go to Solution.

HiXiebo and Christian,
thank you very much for your answers. Actually, my high priority loop is much slower. I run it with a maximum loop time of 50us = 20kHz or slower, depending on my Signal I want to measure. So my data producing rate is maximum 4*8*20k=640 KB/s. My low priority loop runs at 2ms to 5 ms (much slower then the high priority loop), since I am doing just some simple math calculation there and control the front panel in this loop.
I understand that it is much more efficient to write blocks of data (e.g. 1024*32KB instead of just 32KB) to a file with TDMS. But is it also the same for a queue or RT FIFO, i.e. does the block size of the data chunks also matter for the queue and RT FIFO?
@Xiebo: I understand that caching the read data from the FPGA in the high priority loop first will improve my code. But I do not know how I can cache the data I read? I was thinking to do it with the FPGA FIFO, but the FPGA read/write blocks seem to be faster for me and I do not know why? Can you tell me a block/vi to cache the data I read from the FPGA or maybe even an example?
@Christian: This NI_MinimumBufferSize property looks exactly what I was looking for. But my question is now if I should put the tdms write VI's in my high priority loop and read directly from the FPGA FIFO buffer to the file as it is done in the Disk logging example at http://zone.ni.com/devzone/cda/tut/p/id/11198? Or is it better to read the data from the FPGA via the FPGA read/write function, write the data to a RT FIFO in the high priority loop and then write the data with the NI_MinimumBufferSize property option to the tdms file from the RT FIFO in the low priority loop?
In summary, I am still unsure if the FPGA FIFO or the FPGA read/write function with a queue or RT FIFO is better for me and how I can create a cache to build chunks of data blocks to write.
Thank you very much in advance for your help.
Best regards
Andy

How to Write a trigger to hold session data

Hi Everyone,
There are 4 Weblogic Servers which are connected to the database concurrently. In the database I have Application Users table "USERS". When a user is logged to the application let us say userA(from "USERS" table) is logged into the application, whenever that same userA logged into the application from other Weblogic server(other system) it should not allow to login into the application. Is it possible to write a trigger for this. If possible, Can any body suggest how to write a trigger to hold that UserA data into one temporary table as long as that userA is active and removes the data from temporary table when userA logged off (OR) as well as that Weblogic server is goes down.
Thanks in advance.

Hi Justin,
First Thank you very much to all of you.
1. Yes Application Users are authenticated only once,
that to at the time of login to the Application.
2. We are not running any script that informing the
message like "connections
from the downed server should be reset". Do you
you think is it suggestable.
It's not mandatory to use triggers only.Can we
achieve this by maintaining any temporary table.
I have one idea is that, Lets create a table name
e "App_Users_Session_Data(User_Id,Is_Active)"
If "User A" logins into the application then User_Id
= 1A and Is_Active = 'T' will be entered
automatically into the table
"App_Users_Session_Data". When same "UserA" logins
from other Weblogic Server then Application first
check this table and informing that "UserA" already
logins and is active.
Whenever "UserA" loggsoff then this entry will be
automatically deleted.
My doubt is "UserA" logins successfully into the
application and corresponding user entry is there in
"App_Users_Session_Data". If Weblogic Server goes
down from where this UserA logins, This entry will
not be deleted. If this entry is still there then the
same UserA should not login into the application from
the same Weblogic server(which is up again). My doubt
is how to remove this entry automatically when
Weblogic server goes down. Can we achieve this by any
other way. If possible can u give some guidelines
thats enough for me.
Thank you everyone
SankarHi,
First off all and as I undeerstood you can change your application.
1- A table say weblogic_servers have to be created:
Several scenarios are possibles. If you want you can have a row per weblogic server in this table with what you want as identifier. Any way this table can have a column (sid for example) which identifies the weblogic database session. This can be managed by logon and logoff triggers for the related database user. The logoff trigger for example deletes all lines in App_users_Sessions_Data (see below) related to the same session as the weblogic server and puts the session sid in weblogic_servers to NULL.
2- Change the table App_Users_Session_Data:
You have to add a column (sid for example) linking the app user to the database session of the weblogic server. When a user connects, you can check if the databse session is always there and decide accordingly.
A good idea in my opinion is to centralize your logic by putting it in an INSERT trigger on App_Users_Session_Data.

How to write a sql query to retrieve data entered in the past 2 weeks

Hi,
I have file names and last accessed date(java.sql.Date format) stored in my database table, I would like to know how I can write a query to get the name of files accessed in the past 2 weeks,I use open sql server at the back end.
Thanks in advance.

This has essentially nothing to do with JDBC. JDBC is just an API to execute the SQL language using Java and thus interact with the databases.
Your problem is related to the SQL language, you don't know how to write the SQL language. I suggest you to go through a SQL tutorial (there is one at w3schools.com) and to read the SQL documentation which come along with the database in question. A decent database manfacturer has a website and probably also a discussion forum / mailinglist as well.
I'll give you a hint: you can just use equality operators in SQL like everywhere. For example: "WHERE date < somedate".

How to write a procedure to load the data into a table using xml file as input to the procedure?

Hi,
Iam new to the xml,
can u please anyone help me how to write procedure to load the data into a table using xml as input parameter to a procedure and xml file is as shown below which is input to me.
<?xml version="1.0"?>
<DiseaseCodes>
<Entity><dcode>0</dcode><ddesc>(I87)Other disorders of veins - postphlebitic syndrome</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity>
<Entity><dcode>0</dcode><ddesc>(J04)Acute laryngitis and tracheitis</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity>
<Entity><dcode>0</dcode><ddesc>(J17*)Pneumonia in other diseases - whooping cough</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity>
</DiseaseCodes>.
Regards,
vikram.

here is the your XML parse in 11g :
select *
from xmltable('//Entity' passing xmltype
'<?xml version="1.0"?>
<DiseaseCodes>
<Entity><dcode>0</dcode><ddesc>(I87)Other disorders of veins - postphlebitic syndrome</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity>
<Entity><dcode>0</dcode><ddesc>(J04)Acute laryngitis and tracheitis</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity>
<Entity><dcode>0</dcode><ddesc>(J17*)Pneumonia in other diseases - whooping cough</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity>
</DiseaseCodes>
') columns
"dcode" varchar2(4000) path '/Entity/dcode',
"ddesc" varchar2(4000) path '/Entity/ddesc',
"reauthflag" varchar2(4000) path '/Entity/reauthflag'
dcode                                                                            ddesc                                                                            reauthflag
0                                                                                (I87)Other disorders of veins - postphlebitic syndrome                           0
0                                                                                (J04)Acute laryngitis and tracheitis                                             0
0                                                                                (J17*)Pneumonia in other diseases - whooping cough                               0
SQL>
Using this parser you can create procedure as
SQL> create or replace procedure myXMLParse(x clob) as
2 begin
3    insert into MyXmlTable
4      select *
5        from xmltable('//Entity' passing xmltype(x) columns "dcode"
6                      varchar2(4000) path '/Entity/dcode',
7                      "ddesc" varchar2(4000) path '/Entity/ddesc',
8                      "reauthflag" varchar2(4000) path '/Entity/reauthflag');
9    commit;
10 end;
11
12 /
Procedure created
SQL>
SQL>
SQL> exec myXMLParse('<?xml version="1.0"?><DiseaseCodes><Entity><dcode>0</dcode><ddesc>(I87)Other disorders of veins - postphlebitic syndrome</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity><Entity><dcode>0</dcode><ddesc>(J04)Acute laryngitis and tracheitis</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity><Entity><dcode>0</dcode><ddesc>(J17*)Pneumonia in other diseases - whooping cough</ddesc><claimid>34543></claimid><reauthflag>0</reauthflag></Entity></DiseaseCodes>');
PL/SQL procedure successfully completed
SQL> select * from MYXMLTABLE;
dcode                                                                            ddesc                                                                            reauthflag
0                                                                                (I87)Other disorders of veins - postphlebitic syndrome                           0
0                                                                                (J04)Acute laryngitis and tracheitis                                             0
0                                                                                (J17*)Pneumonia in other diseases - whooping cough                               0
SQL>
SQL>
Ramin Hashimzade

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