Empty string and null

Similar Questions

• Cell.Contents not correctly resolve the empty strings if in excess... Is this a Bug or me?

  Greetings, Folks.

  It's driving me crazy. I can reproduce the problem over and over again. I'm missing a reason why cell.contents would be assessed differently in the case of condition in excess than no? I don't understand...

  Here is the scenario of. CS6, Win7, VB.Net (but the logic is simple so stay with me...).

  Object in question is a line of 3 cells with values in the respective cells: text, double value, double the value.

  Here's the problem. (gitc = 1 in all these test cases)

  If Not HasValue (curRow.Cells(gitc + 1). Content) then

  Here's the simple function called by the line above:

  Private Function HasValue (value as object( ) As Boolean

     If IsDBNull (value) OrElse value = "" Then Return Fake Else Return True

  End Function

  That is the problem. The code works as expected, provided that the referenced line is not in a State in excess, the object is a text value, and of two values, where the function returns an appropriate assessment. But if the line is in a State in excess, the object resolves in three empty strings ("" ") and as a result, the function returns the wrong assessment.

  Here the rub. If I lie down (or shorten) the column that puts a DIFFERENT line in the place in excess, the same result occurs to this different line, so I know that's not the values.

  Sorry for the long explanation, but I felt that it is important to give as much information as possible when you ask for help.

  Thank you very much for any help and/or an overview.

  TT

  Ah, I am a JavaScripter, but the Council is good even if the syntax is incorrect.

  The fact is that, if the cell is in excess and then its content is indeed empty. What is not empty is the subject of the text in the cell. You probably should look into it. In JavaScript is:

  myCell.texts [0] .silence

  Dave

• What is the empty string, the value null in the column, or...?

  I use Oracle 11.2, a table tb_class as follows:
  
  TB_CLASS (number (3) id, varchar2 (32) nm, seqNum number (3));
  
  1, 212
  2, "under", 12
  3, 'qq', 12
  
  Select * from TB_CLASS where id = 1 and n = null;... .no selected line
  Select nvl (nm) in the TB_CLASS where id = 1; ... 1 selected line
  
  Any know what's in the column of row id = 1 nm? I thought that it is an empty string, but why it returns no rows in the first query?
  
  Thank you!

  (1) in Oracle there is no difference between NULL and an empty string.

  (2) NULL is never equal to what whatsoever (including another NULL). NULL is never spotty what whatsoever (including another NULL). You must use the IS NULL and IS NOT NULL operators to search for NULL values

  SELECT *
    FROM tb_class
   WHERE nm IS NULL
  

  or

  SELECT *
    FROM tb_class
   WHERE nm IS NOT NULL
  

  Of course, it is also possible that you declare that the NM column contains one or more spaces or it contains one or more non-printable characters and not a NULL value. That's why we asked you what dump (nm) returns

  Justin

• SQL query for empty string

  I am trying to execute the following SQl query, SELECT * failure WHERE ID = '123 ' AND RepairAction =' '; using the DB tools run Query.vi. This query never find record in my database. My database contains a record where the registered ID contains the value '123' and the RepairAction field is an empty string. If I remove the declaration 'AND RepairAction' ';' my query text, the record is found. I think my problem is that I do not use the correct syntax to describe and an empty string. I tried the following: "," ",""," "and NULL as empty and none of these work string arguments.

  I was hoping someone might be able to tell me what the correct syntax is an empty string or if there is another approach that I take.

  Thanks in advance for your help,

  Jim

  Jim,

  Just to be sure, have you used 'is' instead of '=' in this command?

  This makes all the difference in this command.

  Cerati

• Copy topologies from 10 g to the results of the 11 g by empty string error

  Hi people,
  
  I know it's a long shot, but anyone happen to know what is on line 189 of the MDSYS. SDO_TOPO_MAP? :-)
  
  We are copying valid topologies 10.2.0.4 to 11.2.0.2 using exp/imp, following the standard procedure and also add toid_novalidate to the need:
  
  IMP < user > / < pw > @ < database > FILE = < file > .dmp TOID_NOVALIDATE = MDSYS. SDO_GEOMETRY, MDSYS. SDO_ELEM_INFO_ARRAY, MDSYS. SDO_ORDINATE_ARRAY, MDSYS. Index SDO_TOPO_GEOMETRY = ignore tables N = Y = (< list table >)
  
  However, when the topology 11.2.0.2 everything seems to be a success, until we run sdo_topo_map.validate_topology:
  
  ORA-29532: Java call terminated by eception Java exception: java.lang.NumberFormatException: empty string
  ORA-06512: at the 'MDSYS. SDO_TOPO_MAP', line 189
  ORA-06512: at line 4 level
  
  No idea what we are missing here? Thanks in advance for any advice,
  Matt

  It is a combination of a JDBC bug and a corruption of data due to the bug in 10.2.
  The JDBC bug is fixed at 11.2, so data are not 'corrupt' according to the JDBC driver fixed.

  So, the data on the disk must be altered to make it compatible with the 11.2 JDBC driver.
  You must correct the sdo_geometry columns in the tables of topology using this procedure and it will work fine after that.

  create or replace function id_geom (sdo_geometry g)
  deterministic sdo_geometry back as
  G1 sdo_geometry;
  IDX number;
  Sdo_ordinate_array ADR;
  x number;
  number of y;
  number of z;
  point_t SDO_POINT;
  Start
  If (g.sdo_point is not NULL) then
  x: = NULL; y: = NULL; z: = NULL;
  If (g.sdo_point.x is not NULL) then
  x: = g.sdo_point.x * 10;
  x: = x / 10.
  end if;
  If (g.sdo_point.y is not NULL) then
  y: = g.sdo_point.y * 10;
  y: = y / 10;
  end if;
  If (g.sdo_point.z is not NULL) then
  z: = g.sdo_point.z * 10;
  z: = z / 10;
  end if;
  point_t: = SDO_POINT_TYPE (x, y, z);
  on the other
  point_t: = NULL;
  end if;

  If (g.sdo_ordinates is not NULL) then
  ADR: = sdo_ordinate_array();
  ords.extend (g.sdo_ordinates. (Count);
  for idx in 1... loop ords. Count
  x: = g.sdo_ordinates (idx);
  x: = (x * 10.0);
  x: = x / 10.0;
  ords (idx): = x;

  end loop;
  G1: = sdo_geometry (g.sdo_gtype, g.sdo_srid, point_t, g.sdo_elem_info, ords);
  on the other
  G1: = sdo_geometry (g.sdo_gtype, g.sdo_srid, point_t, g.sdo_elem_info, NULL);
  end if;

  return g1;
  end;
  /

  so that you can SQL like this to fix the sdo_geometry columns in all the tables in the topology:
  Update test_topology_edge$ a set a.geometry = id_goem (geometry);

  Make sure that the Spatial index is deleted before doing this operation.

  Siva

• Reading XML File.vi returns an empty string

  Hello

  I use reading of XML File.vi and this VI returns an empty string on my XML file, but on another XML file, it seems to work correctly.

  I open my file XML in Internet Explorer 7.0 and it apears as aspected.

  What could be the problem?

  Thanks in advance for any help.

  Kind regards

  Daniel Coelho

  You are right, and it seems to work as I want.

  Thank you for your help, this LabXML works well.

  This post is officially solved

  My best regards,

  Daniel Coelho

• Empty string returned after receipt gpib

  Nobody knows why, I would periodically get an empty string returned after the issuance of a receive().  It is originally a big delay in my program that I can't really afford to have. The delay occurs while the front desk manages the empty string. This sequence works fine most of the time.

  VB code:

  Public void GetData (GPIBAddress, SendString) As String
  Dim ReadThis AsString, RPD As Integer, ReadTemp As String
  read:
      
  Call Send (0, GPIBAddress, SendString, NLend)
  Wait (500)
  Call ReadStatusByte (0, GPIBAddress, RPD %)
      
  ReadThis = Space$ (140)
      
  Call Receive (0, GPIBAddress, ReadThis, STOPend) I get an empty string here, not always.
      
  If Trim (ReadThis) = "" then to correct, I issue this sequence.
  Call DevClear (0: 26)
  GoTo review
  End If
      
  GetData = ReadThis
  End Function

  OR SPY:

  See attachment.

  I'm talking to a Keithley 2612.

  I use NI488.2 2.73

  In your code snippet, I see where you made a ReadStatusByte, but the result is not checked. When considering the capture of Spy file, where the reception work, the ReadStatusByte returns the result of "0 x 04", as noted in the attached bitmap, ReadStatusByteWithMAV.gif. This result is known as the VMR (Message available) bit. If 4 (MAV bit) Bit is set, which indicates that there is something in the output queue which can be read. Information about the parameters of the ILO for a Keithley 2612 can be found starting on Page 655 by the section called, Status byte and service request (SRQ) in the reference manual. Here is a link to the reference manual:

  http://www.Keithley.com/data?asset=52057

  In the case of the reception fails (line 63 in the capture file), result of the previous call of the ReadStatusByte was '0x00' (as shown in the attached picture, ReadStatusByteNoMAV.gif), which means that there was nothing in the output queue to read.

  After a ReadStatusByte, you should check the result to see if there is something in the output queue to read. If the result is "0x00", then you can probably do something like add a delay and keep control of the ReadStatusByte again until the ReadStatusByte is back with 4 bits set. When Bit 4 is set, you can do a front desk to read the output queue.

  Hope this information is useful.

• PDWordGetString returns an empty string?

  Hello, when I use the PDWordGetString function with the PDDocCreateWordFinderUCS function, I get an empty string, but the PDWordGetLength function returns a value > 0.

  In the documentation I read: If PDDocCreateWordFinderUCS() is used to create the word Finder, PDWordGetString() returns only Unicode.

  How is it possible for me to receive an empty string?

  Perhaps the easiest way if you have the string as char * is simply exchanging items 0.1 then Exchange 2, 3 and so on until the end of the string. You can then treat as wchar * once again.

• How to solve error {java.lang.NumberFormatException: empty string}

  Mr President.
  
  I use the following code and get error submitted.
  
  
  {error} {
  java.lang.NumberFormatException: empty string
  at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1011)
  at java.lang.Double.parseDouble(Double.java:540)
  to the invoice. InvoiceController$ 4.changed(InvoiceController.java:192)
  } {error}
  
  and
  

  {
  
  //wt ,  sValExlSt1 and sPrice1 are numbers
  
  
   wt1.textProperty().addListener(new ChangeListener<String>() {
                  public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {
                      sValExlSt1.setText(String.valueOf(
                              Double.parseDouble(newValue)  * Double.parseDouble(sPrice1.getText())));
                  }
              });
          } catch (NumberFormatException e1) {
          }
  
  }

  Help, please.

  NewValue or sPrice1.getText () is empty. The error message says "empty string".

• I'm trying to extract the strings and load them into a text-helpplease file

  I'm trying to extract the strings and load them into a file text without space between them - see below
  
  p_csa = ISCC M4 DP
  
  where p_csa is a tring to load into a text file
  
  
  
  Code:
  
  SELECT SUBSTR (p_csa, 0, 0) INTO v_telco FROM DUAL;
  SELECT SUBSTR (p_csa, 1, 4) INTO v_comp FROM DUAL;
  SELECT SUBSTR (p_csa, 5.3) INTO v_csa_prefix FROM DUAL;
  SELECT SUBSTR (p_csa, 8, 4) INTO v_csa_type FROM DUAL;
  
  fileidinvoice: = UTL_FILE. FOPEN (c_data_location, filenameinvoice, 'W');
  fileidlog: = UTL_FILE. FOPEN (c_data_location, filenamelog, 'W');
  
  UTL_FILE. PUT_LINE)
  fileidinvoice, v_telco | » '|| v_comp | "|" | v_csa_prefix: "| v_csa_type);
  
  
  -the content of the file-
  
  ISCC M4 DP
  
  =====================
  I want to remove the space between the chain above for the content of the file should look like this:
  
  -the content of the file-
  
  GCSIM4DP

  Hello

  976253 wrote:
  I'm trying to extract the strings and load them into a file text without space between them - see below

  p_csa = ISCC M4 DP

  where p_csa is a tring to load into a text file

  Code:

  SELECT SUBSTR (p_csa, 0, 0) INTO v_telco FROM DUAL;

  Is it always NULL?

  SELECT SUBSTR (p_csa, 1, 4) INTO v_comp FROM DUAL;

  You don't need the double table much in PL/SQL. You can simply say

  v_comp := SUBSTR (p_csa, 1, 4);
  

  Almost all integrated single-row functions work in PL/SQL. (NVL2 is the only one I know who does not work in PL/SQL).

  SELECT SUBSTR (p_csa, 5.3) INTO v_csa_prefix FROM DUAL;
  SELECT SUBSTR (p_csa, 8, 4) INTO v_csa_type FROM DUAL;

  fileidinvoice: = UTL_FILE. FOPEN (c_data_location, filenameinvoice, 'W');
  fileidlog: = UTL_FILE. FOPEN (c_data_location, filenamelog, 'W');

  UTL_FILE. PUT_LINE)
  fileidinvoice, v_telco | » '|| v_comp | "|" | v_csa_prefix: "| v_csa_type);

  What are you trying to do here? For example, what you're trying to put between c_comp and v_csa_prefix?

  -the content of the file-

  ISCC M4 DP

  =====================
  I want to remove the space between the chain above for the content of the file should look like this:

  -the content of the file-

  GCSIM4DP

  If you don't want space, then only concatenate all the spaces in the string before you write it and REPLACE allows you to delete all the spaces that have been copied from p_csa. For example:

  UTL_FILE.PUT_LINE ( fileidinvoice
              , REPLACE ( v_telco || v_comp
                                      || v_csa_prefix
                            || v_csa_type
                     , ' '
                     )
              );
  

  I guess you need the v_comp of separate variables, the v_csa_prefix and the v_csa_type for something.

  I hope that answers your question.
  If this isn't the case, after a complete script that people can run to recreate the problem and test their ideas. Display the results you want (in other words, the contents of the file created).
  Always say what version of Oracle you are using (for example, 11.2.0.3.0).
  See the FAQ forum {message identifier: = 9360002}

• ReferenceError: Error #1069: y property not found on string and there is no default value.

  can someone tell me why I get this error?

  ReferenceError: Error #1069: y property not found on string and there is no default value.

  import flash.events.Event;

  var control = false

  var balls: Array = [one, two, three];

  var which_balloon =""

  tec.addEventListener (MouseEvent.CLICK, moveit)

  one.oney.addEventListener (Event.ENTER_FRAME, kav);

  two.twoy.addEventListener (Event.ENTER_FRAME, kav);

  three.threey.addEventListener (Event.ENTER_FRAME, kav);

  function moveit (MouseEvent) {}

  which_balloon = Balloons [Math.Round (Math.Random () * 2)]

  check = true

  }

  function kav(e:Event) {}

  {if(Checks==true)}

  which_balloon.y-= 5

  }

  If (which_balloon.y < = 100) {}

  check = false

  which_balloon.y = 350

  }

  }

  When you set which_balloon to line 3 of your code, you set it to an empty string. This will type the variable as a string. The strings cannot have a property there.

  What you probably want to do is type your which_balloon to the same variable type as some one and two and three are.

• Regex to replace all occurrences of an empty string, except the last

  Hello, everyone!
  
  I need get to a regular expression to replace all occurrences of an empty string except the last. Right now I'm doing this with this code:
  

  public static void main(String[] args)
  {
      String str = "abc";
      String regex = "";
      System.out.println(str.replaceAll(regex, "-").replaceFirst("-$", "")); // -a-b-c
  }

  As you can see, to do this, I have to make two calls: one for replaceAll and another for replaceFirst to get rid of the last character. So I would like to get rid of the call to replaceFirst and have the variable of regex as being a regular expression that would be to insert the character along the chain of all but the last. I'm really not very good with regexs, so I ask your help here. The thing I work, but I think it would be more elegant with just a regex to do.
  
  Thank you in advance.
  
  Marcos

  Try this:

  String data = "abc";
  System.out.println(data.replaceAll(".", "-$0"));
  

• ArgumentError: Error #2085: aliasName parameter must be non-empty string.

  HI -.

  I started having this error today for an application I am developing using FlashBuilder 4. Here is the stack trace full (the real appname replaced bold text):

  ArgumentError: Error #2085: aliasName parameter must be non-empty string.
  Global / flash.net::registerClassAlias()
  to _FlexInit$ /init ({appName}_)
  to mx.managers::SystemManager / http://www.Adobe.com/2006/Flex/MX/internal:kickOff ([E:\dev\4.0.0\frameworks\projects\fra mework\src\mx\managers\SystemManager.as:2620])
  to mx.managers::SystemManager / http://www.Adobe.com/2006/Flex/MX/internal:preloader_completeHandler ([E:\dev\4.0.0\frame works\projects\framework\src\mx\managers\SystemManager.as:2539])
  at flash.events::EventDispatcher/dispatchEventFunction()
  at flash.events::EventDispatcher/dispatchEvent()
  at mx.preloaders::Preloader/timerHandler() [E:\dev\4.0.0\frameworks\projects\framework\src\mx \preloaders\Preloader.as:515]
  at flash.utils::Timer/_timerDispatch()
  at flash.utils::Timer/tick()

  Looks like the the machine virtual flash tries to load and initialize my application, but fails. I can't understand why this is happening?  It worked last week.

  Few things that could change:

  (a) our company is updating the runtime flash to patch vulnerabilities that could have caused something? (I tried in FF, IE and Chrome... same err.)

  (b) my code updates... but I swear to you the necessary changes were made later in the screens... and this error occurs when the application is started.

  Enjoy all help/insight...thanks in advance.

  [s k]

  [RemoteClass(alias="com.abc.def.WorksGridRow")]

  If you use something like above in your application, then the path / of value is changed or the value of the alias is missing.

• FDK - remove empty paragraphs and nb spaces in a document

  Hello

  I'm trying to remove the empty paragraphs and spaces nonbreaking not a document - have tried to cross through the paragraphs in the document by getting the ID of the paragraph and find every paragraph start and end (with FTI_PgfEnd) to check all the channels in the meantime. However, I do not get the result.

  

  I get the following:

  

  Any help would be appreciated...

  Welcome,

  pnk80

  OK, I have not had the time for it but started to get curious anyway. I found a way to remove when the text also contains tabs or nonbreaking spaces. I added the following front of the line of F_StrStripLeadingSpaces():

  IntT j;

  for (j = 0; j< f_strlen(textitems.val[i].u.sdata);="">
  If (. u.sdata textItems.val [i] [j] == 8 | textItems.val [i] [j].u.sdata == 17)
  textItems.val [i] [j].u.sdata = 32;

  .. as in:

  . . .

  for (i = 0; i< textitems.len;="">
  {
  IntT j;

  for (j = 0; j< f_strlen(textitems.val[i].u.sdata);="">
  If (. u.sdata textItems.val [i] [j] == 8 | textItems.val [i] [j].u.sdata == 17)
  textItems.val [i] [j].u.sdata = 32;

  remove the spaces to the left. If the string is nothing but white space, we will
  get an empty string
  F_StrStripLeadingSpaces (textItems.Val [i].u.sdata);

  . . .

  This replaces tabs and spaces of nb with normal spaces, until the rest of the operation continues (8 = tab, 17 = nb space).  I must say, though, I'm a little confused about why these character codes are used. I would have thought the tab would be 9, and the nb of space something else. But in any case, it works in my test.

  Russ

• Select the text to all_views returns an empty string

  My application allows the user to choose between the data provider for ODBC and the data provider for Oracle. (ODP)
  
  When you use the ODBC statement:
  
  Select the text in all_views where view_name = 'MYVIEW '.
  
  Returns the string expected.
  
  If I connect via ODP however it returns an empty string.
  (If I use "Select *" it tells me that the text_length is 154 in this case-, so there are certainly available text.)
  
  I think it has something to do with the fact that the data type is long.
  In both cases I recover data with rdr. GetChars(), that should work.
  
  If I use the dbms_metadata.get_ddl instead of this function, it returns the string (probably because the return type is LONG)
  Unfortunately this function works only for views in the current schema, while the original works of Select for any view.
  (And I don't know what version of Oracle, this feature has been added-I need to support older versions too).
  
  Similarly, if I use one of the XML functions to retrieve the text in XML format it works fine.
  (Again it is probably returned as a VARCHAR2 instead of a LONG.)
  
  The strange thing is that when I created my own table containing a column LONG, I've been able to load and retrieve data without any problem.
  
  The problem seems to be specific to this column in all_views.
  
  Anyone know a solution to this?
  
  Thank you
  Mike

  Did you put InitialLONGFetchSize property appropriately on your OracleCommand object? See if this property does the trick for you?