Send the data collected by sensors in cell phone android to Labview installed on a PC

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  tsa256 wrote:

  Basically, I'm curious why should we catalogued something? It seems to me that it's just a little like a "band-aid" for editing data in conversion to a new data type, when it is not properly declared with an appropriate data type. What would be the advantage of this?

  It really depends on the specific situations.

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  This means that if you do not convert the data yourself and you will see a red dot forced LabVIEW will do it for you.

  As to why the data was not the correct data type in the first place, it is sometimes inevitable.

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  -you are given a 3rd part VI, dll, etc. that returns a numeric value as a double, but you need the value to I8.

  You cannot change the output of the function given to you, so what you can do to remedy this situation is cataloged data.

  tsa256 wrote:

  Furthermore, I see a lot of data type casting to U8 programs before sending it over the network. Various reviews say it's for speed, but I can't understand how it improves speed. The same amount of data is still sent, just in a different type of data. This is overcoming a limitation of the network. The network somehow send smaller data types faster?

  Somehow, this is my first response, but in a more general sense.

  Many functions down to the level of the OS run in binary.

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  END;

  END;

  /

  SQL>begin
    2    dbms_output.put_line( length( rpad( ' ', 32767 ) || 1234 ) );                        -- result in clob with length 32771
    3    dbms_output.put_line( length( rpad( to_clob( ' ' ), 32767 ) || 1234 ) );             -- result in clob with length 32771
    4    dbms_output.put_line( length( rpad( to_clob( ' ' ), 32768 ) || to_char( 1234 ) ) );  -- result in clob with length 32772
    5    dbms_output.put_line( length( rpad( to_clob( ' ' ), 32768 ) || 1234 ) );             -- ORA-06502: PL/SQL: numeric or value error
    6  end;
    7  /
  

  32771

  32771

  32772

  Start

  *

  ERROR on line 1:

  ORA-06502: PL/SQL: digital error or value

  ORA-06512: at line 5

  It looks like to the | default operator using varchar2.

  In line 3 the clob and number are implicit cast to a varchar2, and both are concatenated in a clob

  In line 4 the clob cannot be cast to a varchar2 because it is in the long run, so Oracle varchar2 (with the number) caste implied on the clob type too, that succeeds

  In line 5 the clob cannot be cast to a varchar2 because it's for a long time, so Oracle is trying to get the number to a clob to-online error

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