Dealing with null values from a database (easy?)

I'm sure this should be a simple question :
I'm creating a dynamic dropdown of my companies products that once a product is selected draws values (links) from a database and displays them (links to User guides, FAQs etc).
My problem is dealing with blank entries in the database - i.e. if a product doesn't have a User guide I've left the database blank.
I'd like to show 'none' or 'not available' if the entry is blank rather than the 'null' I currently get.
I'm sure it should be a straightforward if .... else .... but I'm struggling and would appreciate any help,
Many thanks,
Mo

Thanks for the message, the cut down piece of code I'm using for the output is:
<%
while (rs.next())
//header row
out.println("<tr bgcolor='#666666'>");
out.println("<td><font style='font-family:arial;color:#ffffff;font-size:10px;'>Product Name</font></td>");
out.println("<td><font style='font-family:arial;color:#ffffff;font-size:10px;'>FAQs</font></td>");
out.println("<td><font style='font-family:arial;color:#ffffff;font-size:10px;'>Technical Information</font></td>");
out.println("</tr>");
//results
out.println("<tr border='1' bordercolor='#CCCCCC' bgcolor='#FFFFFF'>");
out.println("<td><font style='font-family:arial;font-size:12px;font-weight:bold;'><a style='text-decoration:none' href=" + rs.getString("ProductURL") + " target='_blank'><font color='#669999'>" + rs.getString("ProductName") + "</a></td>");
out.println("<td><font style='font-family:arial;color:#000000;font-size:10px;'>" + rs.getString("FAQs") + "</td>");
out.println("<td><font style='font-family:arial;color:#000000;font-size:10px;'>" + rs.getString("TechInfo") + "</td>");
out.println("</tr>");
stmt.close();
conn.close();
%>
It's the FAQs and TechInfo strings I need to use the statement on - if there's no entry show 'none',
Thanks again,
Mo

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Handle NULL Values from Teradata Database in OBIEE

Hi All,
I have records in a Teradata that are marked with 'A' for Available and sometimes blanks. Even though in OBIEE I have put a filter that says display all records with NULL values or 'A' I am only getting values with 'A'. How can I pick up the records with blanks in that field.

Looks like the column value is not NULL. I would suggest to know the exact value of the column
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How to post null values from h:inputText?

Hello,
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Ulrich

I haven't seen a solution for this as far.
This is how I do it:
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Error while populating drop down list with values from a database

Hi all,
I have a JSP page with a drop down list that is to be populated with values from a database.
This is the code in my JSP file:
     
         
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What am I doing wrong in the JSP code?
Thanks for the help in advance.
UPDATE: I commented out the form, and added <%=floornumbers.size()%> right above the commented code to check if the ArrayList is indeed getting populated with the values from the database (the values are of type integer in the database). The page still freezes like before. I'm puzzled now :confused: .

Wrong usage of Iterator.

         
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something like usage of <c:forEach/> or <logic:iterate/> would be lot better without writing a single scriptlet code.
Hope that might help :)
REGARDS,
RaHuL

How to deal with the situation when the database change into ms-sqlserver ?

Hi,dear all,
How to deal with the situation when the database change into ms-sqlserver or other database?
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all who know how to resolve this,tell me pls,thanks.
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China
Message was edited by:
user526724

Hi Paulbin,
Do you want to supply a function-pointer to a DLL so it can call[back] your VI? Here's how it can be done with .NET, though, that solution requires a C compiler. A single "VI_to_function-reference" utility could handle all cases where the callback passes no parameters. Maybe someday somebody will share that dll.
Did you know that LabVIEW can use Events for some COM-signals change? See pic. (Note: DTR is not listed - - )
Another question is another function's prototype is WORD SetTestType(WORD comHandle, bool type1, bool type2, bool type3), I tried to use a boolean control and a Boolean to (0,1) node in labVIEW to pass parameters to CLF, I config the bool input value as U8(according to C++ bool type) and U32(according to WIN32 BOOL type), it dose not help, when I execute the VI, LabVIEW will be disappeare, it seems to be closed, I must start it again.
Could someone has similar experience on this points?
It's easy to crash LabVIEW misusing CLF - maybe there's another reason for the crash besides bool mis-match(?) Do you know which "Calling convention" is required? What type is comHandle? (where does comHandle come from?)
Cheers!
Message Edited by tbd on 03-23-2007 09:34 PM
Message Edited by tbd on 03-23-2007 09:35 PM
"Inside every large program is a small program struggling to get out." (attributed to Tony Hoare)
Attachments:
evt.jpg ‏7 KB

JDBC MS Access--- cannot extract entry with null value with data type Meta

I'm trying to extract a data entry with null value by using JDBC. The database is MS Access.
The question is how to extract null entry with data type memo? The following code works when the label has data type Text, but it throws sqlException when the data type is memo.
Any advice will be appreciated! thanks!
Following are the table description and JDBC code:
test table has the following attributes:
Field name Data Type
name Text
label Memo
table contents:
name label
me null
you gates
Code:
String query = "SELECT name, label FROM test where name like 'me' ";
ResultSet rs = stmt.executeQuery(query);
while (rs.next())
String name = rs.getString("name");
rs.getString("val");
String label = rs.getString("label");
System.out.println("\t"+name+"\t"+label);
catch (SQLException ex)
System.out.println(ex.getSQLState());
System.out.println(ex.getErrorCode());
System.out.println("in sqlexception");
output:
C:\Temp\SEFormExtractor>java DBTest
yet SELECT name, label FROM test
null
0
in sqlexception

The question is how to extract null entry with data type memo?Okay, what you need to do is this:
if (rs.getString("val") == null)
// do something
}This way, when it's a null value, you can check it first, and then handle it how you want, rather than getting an exception.

Null Values from a Data Source

This is more of an implementation question than a
troubleshooting question. Also, since I've been unable to find any
documentation on this I was wondering if anyone has come across
this behavior or found a bug with it.
Yesterday I was working on an application to explore some
proof of concept aspects of Flex for an application I'm developing.
I started running into a problem with Flex Data Services throwing
back an 'Unknown Property: "clientaddress1"' error whenever I tried
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in the database it would thrown the Unknown Property error. I spent
a good chunk of the day trying to figure out what was causing this
and finally gave up and called it a day.
This morning I was reassessing what the problem was and
trying to find the differences between my database and my code and
I stumbled upon the fact that I could add no records and modify
them without a problem, however if I tried to access an existing
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I start analyzing the database and found that I'd configured
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matching my action script class as clientaddress1 = ""; So, upon
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Also, if any of the properties in the database are null it
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I can resolve the problem by not using null values in the
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Also, if a Flex guru could explain the reasoning for this
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Best regards,
Chris Maloney

I realize that I didn't clarify that I am using ColdFusion
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wizard in Flex Builder.
package com.generated
[Managed]
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public var clientstate:String = "";
public var clientzip:String = "";
public var clientphone:String = "";
public var clientemail:String = "";
public function Clients()
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Need help Take out the null values from the ResultSet and Create a XML file

hi,
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from Frame1 class. I am passing the boolean value to get the null values from the ResultSet and then add those
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the null and not null values.
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Thanks in advance.
============================================================================
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============
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tagvalue=rs.getString(i);
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/*============if the boolean value is false it adds the null and not
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less than 0 and does the else clause in the if(checkifnull)===*/
if(checkifnull){
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users.addContent((new Element(tagname).setText(tagvalue)));
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users.addContent((new Element(tagname).setText(tagvalue)));
else{
users.addContent((new Element(tagname).setText(tagvalue)));
root.addContent(users);
out=new FileOutputStream("c:/XMLFile.xml");
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outputter = new XMLOutputter();
outputter.output(doc,out);
catch(IOException ioe){
System.out.println(ioe);
catch(SQLException sqle){

Can someone please help me with this problem
Thanks.

Null values from DB2 cause problems

Hi,
I have another problem with database link to DB2 using IBM iSeries Access for Linux on 64 bit OEL5 with Oracle Database gateway and unixODBC 2.2.14.
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isql returns correct results.
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If the driver is not fully ODBC level 3 compliant and misses functions, we're lost. But sometimes the drivers are ODBC level 3 compliant but miss the correct 64bit implementation. In those cases we can tell the gateway to use the 32bit ODBC level 3 standard by setting in the gateway init file:
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Sql query slowness due to rank and columns with null values:


Sql query slowness due to rank and columns with null values:
I have the following table in database with around 10 millions records:
Declaration:
create table PropertyOwners (
[Key] int not null primary key,
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OwnerKey int null,
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go
[Key] is primary key and combination of PropertyKey, BoughtDate, OwnerKey and GroupKey is unique.
With the following index:
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[PropertyKey] ASC,
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Description of the case:
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declare @ownerKey int = 40000
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from (
select PropertyKey, BoughtDate, OwnerKey, GroupKey,
RANK() over (partition by PropertyKey order by BoughtDate desc, OwnerKey desc, GroupKey desc) as [Rank]
from PropertyOwners
) as result
where result.[Rank]=1 and result.[OwnerKey]=@ownerKey
It is taking 2-3 seconds to get the records which is too slow, similar time it is taking as I try to get the records using the GroupKey. But when I tried to get the records for the PropertyKey with the same query, it is executing in 10 milliseconds.
May be the slowness is due to as OwnerKey/GroupKey in the table can be null and sql server in unable to index it. I have also tried to use the Indexed view to pre ranked them but I can't use it in my query as Rank function is not supported in indexed
view.
Please note this table is updated once a day and using Sql Server 2008 R2. Any help will be greatly appreciated.

create table #result (PropertyKey int not null, BoughtDate datetime, OwnerKey int null, GroupKey int null, [Rank] int not null)Create index idx ON #result(OwnerKey ,rnk)
insert into #result(PropertyKey, BoughtDate, OwnerKey, GroupKey, [Rank])
select PropertyKey, BoughtDate, OwnerKey, GroupKey,
RANK() over (partition by PropertyKey order by BoughtDate desc, OwnerKey desc, GroupKey desc) as [Rank]
from PropertyOwners
go
declare @ownerKey int = 1
select PropertyKey, BoughtDate, OwnerKey, GroupKey
from #result as result
where result.[Rank]=1
and result.[OwnerKey]=@ownerKey
go
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
Improves MS SQL Database Performance
SQL Server Integration Services:
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JDBC Receiver Adapter with Null Value

HI,
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I check this with other scenario. With the same check at Integration of Empty String Values = Null Value, it doesn't send null value to database. It happens only with my first scenario.
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Hi,
1. The occurrence is 0...1
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UPDATE EXPCRM_T_CustomerProfile SET RequestID=455, RecordNo=1, SAPCustomerCode=0001000344, Error=NULL, Status=2, UpdateDateTime=12/03/2008 13:45:03 WHERE (RequestID=455 AND RecordNo=1)
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Field Error Change from NULL to '
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Thanks,
Pavin

Clarification needed on the behaviour of count with null values

Hi friends,
I am confused about the result given by the count aggregate function when dealing with null. Please can anybody clarify about that to me. Here is what i tried
CREATE TABLE Demo ( a int);
INSERT INTO Demo VALUES
(1),
(2),
(NULL),
(NULL);
SELECT COUNT(COALESCE(a,0)) FROM Demo WHERE a IS NULL; -- Returns 2
SELECT COUNT(ISNULL(a,0)) FROM Demo WHERE a IS NULL; -- Returns 2
SELECT COUNT(*) FROM Demo WHERE a IS NULL; -- Returns 2
SELECT COUNT(a) FROM Demo WHERE a IS NULL; -- Returns 0
Please can anybody explain me why the result is same for the first three select statements and why not for the last select statement. And what does COUNT(*) actually mean?
With Regards
Abhilash D K

There is a difference to the logic when using a column name versus "*" - which is explained in the documentation (and reading it is the first thing you should do when you do not understand a particularly query/syntax). When you supply a column
(or expression) to the count function, only the non-null values are counted. Isnull and coalesce will obviously replace a NULL values, therefore the result of the expression will be counted.
1 and 2 are effectively the same - you replace a null value in your column with 0 and each query only selects rows with a null column value. The count of non-null values of your expression is therefore 2 - the number of rows in your resultset.
3 is the number of rows in the resultset since you supplied "*" instead of a column. The presence of nulls is irrelevant as documented.
4 is the number of non-null values in the resultset since you DID supply a column. Your resultset had no non-null values, therefore the count is zero.

How to get the value from a database without submitting a jsp page

I have a jsp which has a text box depending on the value entered I want to get the value from a database for other two fields with out submitting jsp page. I am using struts.
Thanks For any assistance provided.

Alright,here is an example for you for the first case.
Present.jsp:
============
<html:html>
<head>
<title><html:message key="page.title"/></title>
</head>
<body>
<html:form action="ChangeEvent.do">
<html:hidden property="method"/>

Emp Id:<html:text property="empId" size="5" onkeyup="if(true){this.form.elements[0].value='populateDetails';this.form.submit();}"/>
Emp Name:<html:text property="empName" size="10" />
Email Address:<html:text property="email" size="10" />
<html:submit>Submit</html:submit>
</html:form>
</body>
</html:html>struts-config.xml:
==================
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>

<form-beans>
<form-bean name="employeeFormBean" type="org.apache.struts.action.DynaActionForm">
   <form-property name="empId" type="java.lang.String"/>
   <form-property name="empName" type="java.lang.String"/>
   <form-property name="email" type="java.lang.String" />
</form-bean>
</form-bean>
<action-mappings>
<action path="/ChangeEvent" type="Test.GetChangeAction" name="employeeFormBean" scope="request" parameter="method">

<forward name="success" path="/Present.jsp"></forward>
<forward name="failed" path="/error.jsp"></forward>
</action>
</action-mappings>
</struts-config>GetChangeAction.java:
=====================
public class GetChangeAction extends DispatchAction{
public ActionForward populateDetails(ActionMapping mapping,ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception {
        DynaActionForm dForm = (DynaActionForm)form;
        String empId = dForm.get("empId");
        // calling Model / Db and then getting back Employee Details
        EmployeeBean eb = ModelUtils.getDetails(empId);
        // Updating form bean by updating values from the Model
        dForm.set("empName".eb.getEmpName());
        dForm.set("email".eb.getEmail());
        return mapping.findForward("success");
}well to me this should work regardless to any browser but we need to make sure we put in our logic properly.

How to include null values from DB

Hi,
I want to see all columns values even though it may contain null values. Right now all null columns are being suppresed by XSQL. Is there any way i can configure this.
Thanks in advance
Regards
Veera

use the following attribute in the <xsql:query> element (see the xsql help!):
<xsql:query null-indicator = "yes">..
</xsql:query>
Indicates whether to signal that a column's value is NULL by including the NULL="Y" attribute on the element for the column. By default, columns with NULL values are omitted from the output. Valid values are 'yes' and 'no'.(Default value is 'no')

How to replace NULL values from main table

Dear all,
I like to remove the NULL values from a main table field. Or the question is how to replace any part of the string field in MDM repository main table field.
e.g. I have a middle name field partly the value is NULL in some hundreds of records, I like to replace NULL values with Space
any recommendation.
Regards,
Naeem

Hi Naeem,
You can try using Workflows for automatically replacing NULLs with any specific value.
What you can do is: Create a workflow and set trigger action as Record Import, Record Create and Record Update. So, that whenever any change will occur in the repository; that workflow will trigger.
Now create an assignment expression for replacing NULLs with any specific value and use that assignment expression in your workflow by using Assign Step in workflow.
For exiting records, you will have to replace NULLs manually using the process given by Preethi else you can export those records in an Excel spreadsheet which have NULLs and then replace all NULLs with any string value and then reimport those records in your MDM repository.
Hope this will solve your problem.
Regards,
Varun
Edited by: Varun Agarwal on Dec 2, 2008 3:12 PM

Dealing with null values from a database (easy?)

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