Retrieve a single value from a file .lvm

Similar Questions

• Best practices for retrieving a single value from the Oracle Table

  I'm using Oracle Database 11 g Release 11.2.0.3.0.

  I would like to know the best practice to do something like that in a PL/SQL block:

  DECLARE
    v_student_id    student.student_id%TYPE;
BEGIN
    SELECT  student_id
    INTO    v_student_id
    FROM    student
    WHERE   last_name = 'Smith'
    AND     ROWNUM = 1;
END;

  Of course, the problem here is that when there is no success, the NO_DATA_FOUND exception is thrown, which interrupts the execution.  So, what happens if I want to continue despite the exception?

  Yes, I could create a block nested with EXCEPTION section, etc, but it seems awkward for what seems to be a very simple task.

  I've also seen this handled like this:

  DECLARE
    v_student_id    student.student_id%TYPE;
    CURSOR c_student_id IS
        SELECT  student_id
        FROM    student
        WHERE   last_name = 'Smith'
        AND     ROWNUM = 1;
BEGIN
    OPEN c_student_id;
    FETCH c_student_id INTO v_student_id;
    IF c_student_id%NOTFOUND THEN
        DBMS_OUTPUT.PUT_LINE('not found');
    ELSE
        (do stuff)
    END IF;
    CLOSE c_student_id;   
END;

  But it still seems to kill an Ant with a hammer.

  What is the best way?

  Thanks for any help you can give.

  Wayne

  201cbc0d-57b2-483a-89f5-cd8043d0c04b wrote:

  What happens if I want to continue despite the exception?

  It depends on what you want to do.

  You expect only 0 or 1 rank. SELECT INTO waiting for exactly 1 row. In this case, SELECT INTO may not be the best solution.

  What exactly do you do if you return 0 rows?

  If you want to set a variable with a NULL value and continue the treatment, Frank's response looks good, or else use the modular Billy approach.

  If you want to "do things" when you get a line and 'status quo' when you don't get a line, then you can consider a loop FOR:

  declare
    l_empno scott.emp.empno%type := 7789;
    l_ename scott.emp.ename%type;
  begin
    for rec in (
      select ename from scott.emp
      where empno = l_empno
      and rownum = 1
    ) loop
  l_ename := rec.ename;
      dbms_output.put_line('<' || l_ename || '>');
    end loop;
  end;
  /
  

  Note that when no line is found, there is no output at all.

  Post edited by: StewAshton - Oops! I forgot to put the result in l_ename...

• How to read my waveform data from a file LVM?

  I have collected a form of wave and saved using the file LVM format. I would read the waveform in labview and view with its timestamp and assigned name. The only way that I could read the data in Labview was to convert it to an array of number. I thought that if you could write a waveform and save all data, you should be able to read it back quite easily. I have included my LVM file and two simple programs. The program I use is much larger, but these two programs are representative of what I'm trying to accomplish.

  Thank you

  Eric,

  I am pleased that you have something that can work even if it is not ideal.
  I close this service request, but I thought that I'll let you know that
  because of your issues, I have revised article in the Knowledge Base on
  timestamps and verified for accuracy and thought you should know.

  What is the precision of the timestamp of the waveform returned by my NOR-DAQmx
  Device?
  http://digital.NI.com/public.nsf/allkb/5D42CCB17A70A06686256DBA007C5EEA?OpenDocument

  Concerning

  Vince Methot
  Technical sales engineer
  National Instruments

• FFT waveform (file converted from Matt file lvm) - how to overcome the error dt < = 0?

  Hello

  I use a lvm file after conversion of Matt file. I wanted to get the fft spectrum. I get this error message this dt waveform<>

  How he overcome?

  I have attached the matte file and the vi that I used.

  Best regards

  FESMI

  The Forum is a bit special files that can be attached. Creating a zip file often works. Sometimes, you can change the .txt extension. If you change the extension, please indicate in your message which was the extension of the moose.

  It seems that data in the file has a time column and a column of amplitude. The LabVIEW waveform data type is a cluster of a table of amplitudes (Y), sampling interval (dt), from the time (t0) and optional attributes. That's what the power spectrum VI requires as input. The t0 values is not used if the default is fine. the value of dt can be calculated by the difference of the two adjacent values in the time column. Given that the first value is equal to zero, the second value is equal to dt.  Use the primitive to build a waveform of the palette of waveform.  Expand it to view the dt element.

  In the VI attached all lines is an indicator that contains your saved default file data. Graph XY plots that data.  After subtracting the way to get rid of a continuous component, the data is converted to a waveform. The power spectrum is calculated and displayed using the same VI as in your program. It also uses extract several Information.vi tone for the frequency and amplitude of the main peaks in the data.

  Interestingly, the lower frequency of the spectrum a harmonic of 60 Hz while the tops are almost sharp space 4 kHz ~ 100 Hz apart.  The broad peak near 2.1 kHz does not seem to have noticeable components to 60 or 100 Hz.

  How to avoid the Type of dynamic data (DDT)? Stop using screw Express! For reasons known only to EITHER screw Express a deliver their outputs via the DDT. Except when you open the block diagram of the express VI, there is no way of knowing what the underlying data structure on a thread of DDT.

  Lynn

• How to retrieve a single record from access by program?

  I need to recover a single access record. I have two columns, 'Sess' and 'Topic' in my database. I want back the Session number ('Sess') for a particular topic and post it on the front panel. I wrote the attached VI based on an example I found. This VI contains the number of the Session for the first record, but I can't understand how to identify a search for a specific record in the table.  Thank you!

  Do a google search for «sql tutorial» You need to learn how the SELECT statement. The general syntax is:

  SELECT column_name (s)
  Table_name FROM
  WHERE column_name operator value

• How to retrieve a single value to an XMLTYPE

  Hello
  
  I have the following XML is stored in an XMLType column.
  
  < root >
  < abc > 1 < / abc >
  < abc > 2 < / abc >
  < root >
  
  How can I extract the first occurrence of/root/abc?
  
  Thank you and best regards,
  A

  A number like predicate will give you the nth occurrence.

  Select extractValue (XML_CLOB, ' / root/abc [1]')
  everything which

  Chris

• could not read my file LVM

  Hello world

  I created this file LVM after the acquisition of my signal. Right now I have a problem of extracting data from this file LVM. For example the data in the cell B24 to J24.

  I didn't have something like that because it should be relatively simple. I used loops and methods to extract the data, but she return me the value NaN or another number. I don't know what is happening.

  The attachment is LVM I created. Please help me with this, thank you

  PX

  Use the Express VI to convert the type of dynamic data in a 2D array.  Then the index on the column in your table.

  You can also check the integrity of your data.  In your file, the first line of data is fairly complete.  Later lines have several empty columns before and after the 4 columns of data.

  When I ran the attached VI extract, I noticed she has imported the data, but the columns other lines not aligned with the first complete line in the same way they do when I saw your file in Notepad.  You will get many NaN for wherever your data are empty.

  

• Import data from text file of control of the ring.

  Is it possible to import data to a text ring with labview control.

  I have several definitions of register in the ring controls, but manual entry would take a lot of time.

  Was wondering if there was more automatic way, I could read the values from a file.

  Thank you

  Jim

  Using the first method gives you the ability to extend such that each column specifies a control of the ring if you need fill the multiple rings.

  This example assumes that all of the three rings contain the same number of elements. If this isn't the case, you will need to create a Subvi, which removes the empty elements. [Edit - create a text file that contains a column for each ring, separated by a tab character.]

  

• How can I retrieve all the values in a single query in the oracle XML

  Hi all

  I have xml format below, how do I retrieve all the values in a single query.

  < files >

  < job > MANAGER < / job >

  < details >

  < ename > JONES < / ename >

  < sal > 2975 < / sal >

  < ename > BLAKE < / ename >

  < sal > 2850 < / sal >

  < ename > CLARK < / ename >

  < sal > 2450 < / sal >

  < / details >

  < / documents >

  Thank you

  I prefer desgin a little more sophisticated xml and wrap the details in a separate label.

  Then you could something like that

  1 with testdata until)
  2. Select xmltype)
  3'
  4 MANAGER
  5

  
  6
  7 JONES
  8 2975
  9
  10
  11 BLAKE
  12 2850
  13
  14
  15 CLARK
  16 2450
  17
  18

  
  19
  20 ') in the form x
  21 double
  22)
  23 select
  24 j.job
  25, d.ename
  26, d.sal
  27 of testdata
  28 join
  29 xmltable ("Scriptures" in passing testdata.x)
  30 columns
  31 job varchar2 (30) path "job."
  32, details xmltype path «details»
  (33) j
  34 (1 = 1)
  left outer join 35
  36 xmltable (' details/emp' in passing j.details)
  37 columns
  path of varchar2 (30) 38 'ename' ename
  39, path of varchar2 (30) sal "sal".
  (40) d
  41 * (1 = 1)
  >/

  JOB                            ENAME                          SAL
  ------------------------------ ------------------------------ ----------
  JONES MANAGER 2975
  BLAKE MANAGER 2850
  MANAGER CLARK 2450

• Retrieving values from XML in Oracle 9i - part II

  Hello

  regarding my previous post retrieving values of XML in Oracle 9i , I now have a different requirement.

  Assuming that the XML is as follows:

  <? XML version = "1.0" encoding = "UTF-8"? >

  " < GenericRequest xmlns =" http://webservices.mysite.com/test "xmlns:ns =" " http://webservices.mysite.com/test/NS "xmlns:ns1 =" " http://webservices.mysite.com/test/ns1 "xmlns:ns2 =" " http://webservices.mysite.com/test/ns2 ">

  < ns1:order >

  < ns1:orderItems >

  < ns1:orderItem >

  create < ns1:operation > < / ns1:operation >

  < ns1:brickId > TST002 < / ns1:brickId >

  < ns1:brickAttributes >

  < ns1:attribute >

  < ns2:name > COUNTRY < / ns2:name >

  < ns2: value > U.S. < / ns2: value >

  < / ns1:attribute >

  < ns1:attribute >

  < ns2:name > CUST_ID < / ns2:name >

  < ns2: value > 12345 < / ns2: value >

  < / ns1:attribute >

  < ns1:attribute >

  < ns2:name > CITY < / ns2:name >

  < ns2: value > New York < / ns2: value >

  < / ns1:attribute >

  < / ns1:brickAttributes >

  < / ns1:orderItem >

  < ns1:orderItem >

  Update < ns1:operation > < / ns1:operation >

  < ns1:brickId > TST001 < / ns1:brickId >

  < ns1:brickAttributes >

  < ns1:attribute >

  < ns2:name > COUNTRY < / ns2:name >

  < ns2: value > U.S. < / ns2: value >

  < / ns1:attribute >

  < ns1:attribute >

  < ns2:name > CUST_ID < / ns2:name >

  < ns2: value > 22222 < / ns2: value >

  < / ns1:attribute >

  < ns1:attribute >

  < ns2:name > CITY < / ns2:name >

  < ns2: value > Los Angeles < / ns2: value >

  < / ns1:attribute >

  < / ns1:brickAttributes >

  < / ns1:orderItem >

  < / ns1:orderItems >

  < / ns1:order >

  < / GenericRequest >

  As you can now see the XML contains several elements of the order. For each agenda item, I have a single operation and a brick_id. Then, for each item on the agenda, I have a list of brickAttributes (name and value).

  How can I get something like that?

  OPERATION BRICK_ID NAME VALUE

  --------- -------- ------- -----------

  create TST002 COUNTRY WE

  create TST002 CUST_ID 12345

  create TST002 New York CITY

  update of TST001 COUNTRY United States

  Update TST001 CUST_ID 22222

  Update TST001 CITY Los Angeles

  Version of database is 9.2.0.8

  SELECT * FROM version of v$.

  BANNER

  ----------------------------------------------------------------

  Oracle9i Enterprise Edition Release 9.2.0.8.0 - 64 bit Production

  PL/SQL Release 9.2.0.8.0 - Production

  CORE Production 9.2.0.8.0

  AMT for HP - UX: 9.2.0.8.0 - Production Version

  NLSRTL Version 9.2.0.8.0 - Production

  Kind regards.

  Alberto

  Response of Odie, result is that extend

  with sample_data as (
  select xmltype(
  '
  
            
              
                
                  create
                  TST002
                  
                    
                      COUNTRY
                      US
                    
                    
                      CUST_ID
                      12345
                    
                    
                      CITY
                      New York
                    
                  
                
                
                  update
                  TST001
                  
                    
                      COUNTRY
                      US
                    
                    
                      CUST_ID
                      22222
                    
                    
                      CITY
                      Los Angeles
                    
                  
                
              
            
  ') xmldoc
  from dual
  )
  select extractvalue(value(x), 'ns1:orderItem/ns1:operation', 'xmlns:ns1="http://webservices.mysite.com/test/ns1"') as operation
       , extractvalue(value(x), 'ns1:orderItem/ns1:brickId', 'xmlns:ns1="http://webservices.mysite.com/test/ns1"') as brick_id
       , extractvalue(value(y), 'ns1:attribute/ns2:name', 'xmlns:ns1="http://webservices.mysite.com/test/ns1", xmlns:ns2="http://webservices.mysite.com/test/ns2"') as name
       , extractvalue(value(y), 'ns1:attribute/ns2:value', 'xmlns:ns1="http://webservices.mysite.com/test/ns1", xmlns:ns2="http://webservices.mysite.com/test/ns2"') as value
  from sample_data t
     , table(
         xmlsequence(
           extract(
             t.xmldoc
           , '/GenericRequest/ns1:order/ns1:orderItems/ns1:orderItem'
           , 'xmlns="http://webservices.mysite.com/test", xmlns:ns1="http://webservices.mysite.com/test/ns1"'
           )
         )
       ) x
     , table(
         xmlsequence(
           extract(
             value(x)
           , 'ns1:orderItem/ns1:brickAttributes/ns1:attribute'
           , 'xmlns:ns1="http://webservices.mysite.com/test/ns1"'
           )
         )
       ) y
  ;
  

  As shown, it simply retrieves to a higher level object that repeats once in table x and happening at the table there, which returns the expandable nodes.  The join is managed by value (x) in the second simple table.  It assumes that there is always 1 or several nodes of ns1:attribute in each ns1:orderItem.

• How can I create a multi page PDF from a multi .tif file?  On the creation of a file .pdf from a file multiple .tif, the .tif file is converted to a single page (always the first page of the .tif file) .pdf.  The rest of the document is cut off. The .tif

  How can I create a multi page PDF from a multi .tif file?  On the creation of a file .pdf from a file multiple .tif, the .tif file is converted to a single page (always the first page of the .tif file) .pdf.  The rest of the document is cut off. The .tif file comes from a document by using the fax & Scan app scanner in Windows 10.  I am running Adobe Acrobat Reader DC, which I run with my subscription 'Adobe PDF package, monthly'.  It worked fine until about a month.  I've since upgraded to Windows 10 and Acrobat Reader DC.   I would be very grateful for any help. Eoghainn

  Hello

  This problem has been reported as a bug. Our team of engineers working on this priority issue.

  Kind regards
  Nicos

• Passing values from a CO of a page in the xml file of a field with LOV.

  Hello

  I have 2 pages in this CUSTOMIZATION and the 2nd page got fields that have their turn to LOV.

  The query behind the LOV is sitting in the XML file and as an amendment to this motion, he needs some dynamic values

  I got to a stage where in the Commander of the 2nd page I set up values using getparameters.

  But how to pass this value from the 2nd page to the XML FILE.

  Thank you

  Regis

  Hi Regis

  Leave; s first focus on your first build errors. You said very well reconstruction work but compilation error comes when you run the page.

  It's strange. Can you please confirm if you have added the OFA libraries to your project. Ideally, they should be there once you create an OA project

  Concerning

  Marie Lise S

• Impossible to retrieve the return value of function from pl/sql using the DB adapter

  Dear Experts,
  
  I use the DB adapter in my BPEL process. Using the DB adapter I invoke a PL / SQL function. I am able to send two input parameters for the pl/sql function. But I do not know how to retrieve the return value of the function. Please suggest me.
  
  Thank you
  Rajesh

  Can you tell how pl/sql function looks like you? you return the value of the function, right?

• How to convert one or more files LVM of large file TDMS (500 MB, 32 M samples - 2 channels)

  I would like to be able to read at least 4 million lines of data total 32 million lines at a time. The TDMS file has given for 2 channels and no time data. If I can convert TDMS files in one or more files LVM, I can read large files of LVM using the JMP software.  I'm using Labview 2009. Please provide suggestions.

  Thanks in advance. Best regards, Manish (Univ of a to z)

  Hi Manish,

  For your problem with is .tdms to .lvm, take a look at this forum and This example of community.  I checked out, and in my opinion, he should be able to work well for you in regards to creating multiple files .lvm from single .tdms file.  The only thing that could be a problem is the time requirement to enter all in LV, and saves data to several files, but you will encounter when you work with large consumed data.

  I would also suggest that you take a look at tiara if you are searching by analyzing large data sets.  The program is designed to manage large sets of data and make the analyzation on the data.

• Cannot read the timestamp of the file LVM in table or export to Excel

  Good afternoon!

  Im having issues return timestamps from a LVM file and an excel file.

  Ulitmately, I have a series of files LVM with 6 channels of data and timestamps of correspodning.

  When I read the back files in a table, the channel values are analyzed, but the timestamp is no where. The channel data then exported successfully to an excel sheet (less the time stamps).

  How can I extract the timestamps with the channel data and bring them into an excel sheet?

  NOTE: I do not know you can open the file LVM directly in excel, however, information is not "analysable.

  I appreciate the toughts. I have attached my experimental code as well as the data set, I am trying to extract. I have also included a spreadsheet excel destination.

  Hi, ASAT,.

  Is there a reason that you do not simply write it as File.vi to write your signal data in the excel worksheet? It is an easy way to put in your signal data to an excel spreadsheet (see file attachment). You can also view the code in this Express VI to see how this is achieved.