Handling null column values

I can't find any samples that show how to handle null values returned in a JDBC Select statement. My code bombs out on setLong etc if the column is null.
Any suggestions much appreciated.

wasNull()

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XMLGEN: Produce XML dump of a table WITH tags for null column values

I am new to generating XML so bear with me....
We have a customer who needs an XML extract of data, including tags for any column that is null.
I created a simple test case below using DBMS_XMLGEN.getXML. The first row (A1) has no null values and thus tags for columns A, BEE and CEE are produced. The second row (A2) has null in column BEE and thus tags for only columns A and CEE are produced.
Is there a way to force a tag for null column BEE in the second row?
create table foo (A varchar2(10), BEE number, CEE date);
insert into foo values ('A1',1,sysdate);
insert into foo values ('A2',null,sysdate);
SELECT DBMS_XMLGEN.getXML('SELECT * FROM foo') FROM dual;
<ROWSET>
<ROW>
<A>A1</A>
<BEE>1</BEE>
<CEE>27-SEP-12</CEE>
</ROW>
<ROW>
<A>A2</A>
<CEE>27-SEP-12</CEE>
</ROW>
</ROWSET>

What's the database version? (SELECT * FROM v$version)
Could you use this instead :
SQL> select xmlserialize(document
2           xmlelement("ROWSET",
3             xmlagg(
4               xmlelement("ROW",
5                 xmlelement("A", a)
6               , xmlelement("BEE", bee)
7               , xmlelement("CEE", cee)
8               )
9             )
10           )
11         -- for display purpose only :
12         as clob indent
13         )
14 from foo
15 ;
XMLSERIALIZE(DOCUMENTXMLELEMEN
<ROWSET>
<ROW>
    <A>A1</A>
    <BEE>1</BEE>
    <CEE>2012-09-27</CEE>
</ROW>
<ROW>
    <A>A2</A>
    <BEE/>
    <CEE>2012-09-27</CEE>
</ROW>
</ROWSET>
Or,
SQL> select xmlserialize(document
2           xmlquery(
3             '(#ora:view_on_null empty #)
4             {
5               <ROWSET>{fn:collection("oradb:/DEV/FOO")}</ROWSET>
6             }'
7             returning content
8           )
9           as clob indent
10         )
11 from dual;
XMLSERIALIZE(DOCUMENTXMLQUERY(
<ROWSET>
<ROW>
    <A>A1</A>
    <BEE>1</BEE>
    <CEE>2012-09-27</CEE>
</ROW>
<ROW>
    <A>A2</A>
    <BEE/>
    <CEE>2012-09-27</CEE>
</ROW>
</ROWSET>
(where "DEV" is my test schema)
If you want to stick with DBMS_XMLGEN, you're gonna have to use PL/SQL and setNullHandling procedure.
Edited by: odie_63 on 27 sept. 2012 17:14

Using '=' to check for NULL column value

We are currently encountering an issue where 10.1.0.5 is happily accepting a check on a column for a null value with what I have always known to be an invalid syntax.
For instance:
select col1 from my table where col1=null
Although this is wrong and we are working on locating the queries formatted as such, what I am wondering is why is it working on the 10.1.0.5 version but we cannot get the same query to execute on 8i, 9i, 10.2.0...? Is there a flag that can be enabled to allow this compare?

I am familiar with the correct syntax to be using. What I am looking for is a possible explanation as to why the query below returns the correct results on 10.1.0.5 and returns nothing in all other versions. I would expect the same behavior across all instances. See the two lines in bold "AREA=NULL" and "SUBAREA=NULL"
SELECT DISTINCT
UNIQID,
MGRCOMMENT,
REQ.CREATED_BY CREATED,
C2.CNAME DEVELOPER,
C5.CNAME PRODMGR,
C3.CNAME ASSIGNED,
C4.CONTACTID CURRENTUSER,
ID,
STATUSNAME,
REQ.STATUS STATUSID,
PRIORITYNAME,
TITLE,
MAS1.MODULENAME,
MAS1.AREANAME,
MAS1.SUBAREANAME,
MIN1.MODULE,
MIN2.AREA,
MIN3.SUBAREA
FROM REQ,
PRIORITY,
STATUS,
(SELECT FIRST_VALUE(M1.MODULENAME)
OVER (PARTITION BY REQUNIQID ORDER BY MODULENAME ROWS UNBOUNDED PRECEDING) MODULENAME, FIRST_VALUE(A1.AREANAME)
OVER (PARTITION BY REQUNIQID ORDER BY AREA ROWS UNBOUNDED PRECEDING) AREANAME, FIRST_VALUE(SA1.SUBAREANAME)
OVER (PARTITION BY REQUNIQID ORDER BY SUBAREANAME ROWS UNBOUNDED PRECEDING) SUBAREANAME, REQUNIQID
FROM REQMOD, MOD M1, ARA A1, SBARA SA1
WHERE M1.MODULEID = REQMOD.MODULE
AND A1.AREAID = REQMOD.AREA
AND SA1.SUBAREAID = REQMOD.SUBAREA) MAS1,
(SELECT FIRST_VALUE(C2.CNAME) OVER (PARTITION BY REQUNIQID ORDER BY CNAME ROWS UNBOUNDED PRECEDING) CNAME, REQUNIQID
FROM REQ_ASSIGN, CONTACT C2
WHERE C2.CONTACTID = REQ_ASSIGN.CONTACTID
AND ASSIGNMENT_TYPE=2) C2,
(SELECT FIRST_VALUE(C5.CNAME) OVER (PARTITION BY REQUNIQID ORDER BY CNAME ROWS UNBOUNDED PRECEDING) CNAME, REQUNIQID
FROM REQ_ASSIGN, CONTACT C5
WHERE C5.CONTACTID = REQ_ASSIGN.CONTACTID
AND ASSIGNMENT_TYPE=1) C5,
(SELECT FIRST_VALUE(C3.CNAME)
OVER (PARTITION BY REQUNIQID ORDER BY CNAME ROWS UNBOUNDED PRECEDING) CNAME, REQUNIQID
FROM REQ_ASSIGN, CONTACT C3
WHERE C3.CONTACTID = REQ_ASSIGN.CONTACTID
AND ASSIGNMENT_TYPE<>2
AND ASSIGNMENT_TYPE<>1) C3,
(SELECT DISTINCT REQUNIQID, CONTACTID FROM REQ_ASSIGN WHERE CONTACTID=5) C4,
(SELECT DISTINCT REQUNIQID, MODULE FROM REQMOD WHERE MODULE=1) MIN1,
*(SELECT DISTINCT REQUNIQID, AREA FROM REQMOD WHERE AREA=NULL) MIN2,*
*(SELECT DISTINCT REQUNIQID, SUBAREA FROM REQMOD WHERE SUBAREA=NULL) MIN3,*
REQCOMMENTS
WHERE PRIORITY.PRIORITYID = REQ.PRIORITY
AND STATUS.STATUSID = REQ.STATUS
AND MAS1.REQUNIQID = REQ.UNIQID
AND C2.REQUNIQID = REQ.UNIQID
AND C5.REQUNIQID = REQ.UNIQID
AND C3.REQUNIQID = REQ.UNIQID
AND C4.REQUNIQID = REQ.UNIQID
AND MIN1.REQUNIQID = REQ.UNIQID
AND MIN2.REQUNIQID = REQ.UNIQID
AND MIN3.REQUNIQID = REQ.UNIQID
AND REQCOMMENTS.REQUNIQID = REQ.UNIQID
AND REQ.PROJECTID = 3;

Verify if a report has a null column value with JavaScript ?

Hi,
I have report. User can add new rows through a form. Before the user leaves the application I would like to use JavaScript to check if a certain column has some null values. I built my JavaScript for the before logout and it's working properly, but I need to retrieve if that column has some null values, how can I do that ? This field isn't a mandatory one, but I would just like to alert the user.
Thank you.

You can also use a TRIM function in Answers. Go to the column in question, click on the fx button and then on the Function button. Click on String and you will see TrimLeading, TrimTrailing and TrimBoth. Use TrimTrailing on your column and you should be good to go.

Update all null columns value in single row statement

4) Write a single SQL statement to update all the columns of a table to have -9 instead of null value
e.g:
Before update:
C1     C2     C3
null     9     null
10     null     88
12     8     0
After update:
C1     C2     C3
-9     9     -9
10     -9     88
12     8     0
Thanks

Hi,
Update < table name >
set column name = nvl(column name, -9),
column name = nvl(column name, -9)
Regards
Message was edited by:
Seshu

How to handle Null value in Database Adapter

I configured the DA Adapter, with operation type as "Perform an Operation on a Table - Select" and added few where clause parameters (StreetNo, StreetName city, country, state, zipcode)too.
If we won't enter any value for any of the column in the table (S_ADDR_PER) is taking as NULL, so what happening is, if i give "%" or if i leave as "blank" to those columns(input for where clause parameter). The DB adapter not fetching any records. Any help to handle this situation.
I need query like this...
select * from S_ADDR_PER where city like '%' AND state is NULL AND addr_line_2 like '%';
seems.... I can't use the pure SQL option since i don't know which column will be null. Some case the addr_line_2 column will be NULL in table, in some other case the state or city column will be null.

Hi,
you can handle null with date like this , If it doesn't wortk for you then please explain your problem.
select NVL(to_char(sysdate,'DD-MON-YY'),'Not Recorded')
from dual
NVL(TO_CHAR(
08-NOV-05
select NVL(to_char(NULL,'DD-MON-YY'),'Not Recorded')
from dual
SQL> /
NVL(TO_CHAR(
Not Recorded
Regards

How to update a column value by comparing old value by using DML Handler...

Hi Can anyone post the DML Handler code for updating a column value by comparing the old value.
Thanks,
Ray

Hi,
Here is an example of a DML handler.
BEGIN
DBMS_APPLY_ADM.SET_DML_HANDLER(
object_name => 'scott.emp',
object_type => 'TABLE',
operation_name => 'UPDATE',
error_handler => false,
user_procedure => 'strmadmin.update_column',
apply_database_link => NULL,
apply_name => 'MY_APPLY');
END;
This DML handler which will send any LCR matching the specified conditions to the strmadmin.update_column for customised processing.
You can write the strmadmin.update_column procedure so that it extracts the old values from the LCR. You can then use the old values from the LCR to identify the row in the table. Once you identify the row, you can update it as you want.
I haven't really tried to do any customised processing using DML handlers, but this should work.
Hope this is of help.
Sujoy

ORA-01400 - not null column with default value and item with authorization

I've searched - I would think someone has run into this. APEX 3.0.0.00.20 - I've created a simple form on a table. One of the column is a not null column with a default value. I have a select list on that item, but it has security on it - authorization scheme. So, it checks the user and if that user isn't of the right role, it will not even display that item. However, APEX appears to still send in the column in its sql! So, the default value is useless, it sends in null each time. Even if I set the default at the Item level, I get null. Argg. That's got to be a bug...
In debug, I do not see the item listed at all. It's not used. That's fine - but why is it trying to insert the value? I would think it would leave it off??? I think because the item is associated with a database column. But, getting around this is ugly. Having to create a hidden item for each one, and then check to see if I need to take the list value... horrible. Any way to get around this???

I should add - I guess I can always put my own custom process in to replace the DML. Just seems like a simple thing - if the value doesn't appear on the debug, isn't set with any default value... don't include it in the DML.

How to avoid to check if a column value is NULL?

Hi, I'm a newbee in Oracle.
I have a procedure like this:
create or replace
PROCEDURE get_employee
     v_first_name IN VARCHAR2 DEFAULT NULL ,
     v_middle_name IN VARCHAR2 DEFAULT NULL ,
     v_last_name IN VARCHAR2 DEFAULT NULL ,
To select rows with matching multiple column values, I can simply do this:
SELECT *
FROM employee
WHERE first_name = v_first_name
AND middle_name = v_middle_name
AND last_name = v_last_name
The problem is v_middle_name can be NULL. This means,
I need check if v_middle_name is NULL, and if it is, I need use "IS NULL" instead, like this:
SELECT *
FROM employee
WHERE first_name = v_first_name
AND middle_name IS NULL
AND last_name = v_last_name
It seems very cumbersome to do a check for each column that can be null.
Is there a way that I do not need to do a check for every column?
or is it better to avoid having NULL values in those columns (and replace them with, say a space) ?
Thanks in advance.
Simon

Normally, you would do something like
SELECT *
FROM employee
WHERE first_name = NVL( v_first_name, first_name )
   AND middle_name = NVL(v_middle_name, middle_name )
   AND last_name = NVL(v_last_name, last_name )Of course, if you can ensure that NULL data is not allowed (without creating phony non-NULL data), that is a good thing. In most systems, for example, it is probably reasonable to require a non-NULL first and last name. But you almost certainly cannot require a middle name.
Justin

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
you may go for expression like length(col) where col!='A'
or
case when col is null then '1null'
when col='' then '2'
etc..
once you know the value then replace with 'Unspecified' or any text.

ORA-01405: fetched column value is NULL

Hi All,
I am using OWB 10gR2 and DB 10gR2. I am getting the following error while executing the mapping,
ORA-01405: fetched column value is NULL.
I have used NVL function for the measure columns, but the problem is not solved.
Can anybody please tell me solution,
Thanks in advance,
Siva

Hi Siva
It may be that you've taken care of null value in just one place and now, the error is coming
from somewhere further down the line.
Regards
Arif

How to handle trailing Null columns in a Batch file when ESB reads the file

Dear All,
How can I handle trailing Null columns in a batch file (csv file) that is been used by an ESB FTP adapter for batch file processing.
Since ESB is some times taking up the whole next record as the last column data..
Please update
many thanks...

If your file is not designed to be amazingly large, then you don't need to use a temporary file -- you can just read the data into memory and manipulate it there. (Like, into a Document object or something.)
But if you are dealing with really large files, you might want to consider using a database back end instead of a text file, which is a completely different approach I know but... well, that's why databases were invented.

Id column values for null objects

If I have something like the following, where B.id is mapped to an INTEGER
column in A's table, Kodo wants to store a NULL value into the column. This
doesn't work if the column is specified as NOT NULL. Is there a way to
configure Kodo to use some predefined integer value instead, such as 0
or -1?
class A {
int id;
B b;
class B {
int id;
A a = new A();
a.id = 123;
a.b = null;
pm.makePersistent(a);
pm.currentTransaction().commit();

I'm not sure what you mean by "value mapping." In my case, I am mapping a
null reference to another object. I am using application identity. Here's a
more complete example (still very abbreviated, but hopefully complete
enough):
class A {
static class Id { int id; }
int id;
B b;
class B {
static class Id { int id; }
int id;
int value;
create table A (ID integer not null, BID integer not null)
create table B (ID integer not null, VALUE integer)
<jdo>
<package name="test">
<class name="A" objectid-class="A$Id">
<extension vendor-name="kodo" key="table" value="A"/>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="data-column" value="ID"/>
</field>
<field name="b">
<extension vendor-name="kodo" key="id-data-column" value="BID"/>
</field>
</class>
<class name="B" objectid-class="B$Id">
<extension vendor-name="kodo" key="table" value="B"/>
<field name="id" primary-key="true">
<extension vendor-name="kodo" key="data-column" value="ID"/>
</field>
<field name="value">
<extension vendor-name="kodo" key="data-column" value="VALUE"/>
</field>
</class>
</package>
</jdo>
A a1 = new A();
a1.id = 123;
a1.b = new B();
a1.b.id = 456;
a1.b.value = 999;
pm.makePersistent(a1);
A a2 = new A();
a2.id = 789;
a1.b = null;
pm.makePersistent(a2);
pm.currentTransaction().commit();
The inserts for table A look something like this:
insert into A (ID, BID) values (123, 456)
insert into B (ID, VALUE) values (456, 999)
insert into A (ID, BID) values (789, NULL)
The NULL value fails because the column is specified as NOT NULL
(pre-existing schema scenario).
What I need to be able to do is specify what value gets inserted for null
object references. Kodo is inserting NULL. I need to insert -1.

How to make sqlldr handle mutliple NULL columns

I am using TRAILING NULL COLS in the control file to tell SQL*Loader to treat any relatively positioned columns that are not present in the record as null columns.
But the problem is occuring when there are multiple NULL columns one after the other. In that case SQL*Loader is treating continuous null column as 1 NULL column and then I am getting following message:
ORA-12899: value too large for column
And reason being wrong value is being tried to inserted in wrong column.
How can I stop SQL*Loader from combining multiple and continuous NULL columns and basically to make it treat each of them separately.

I have been able to take care of the issue using the NULLIF attribute. Here is how my control file looks now:
LOAD DATA
INFILE 'tab_sal_ldr.tab'
INSERT INTO TABLE SQL_TAB_LDR
REPLACE
FIELDS TERMINATED BY "\t"
TRAILING NULLCOLS
(COL1 CHAR,
COL2 INTEGER EXTERNAL NULLIF COL2=BLANKS,
COL3 FLOAT EXTERNAL NULLIF COL3=BLANKS,
COL4 DATE EXTERNAL NULLIF COL4=BLANKS)
However it is rejecting the rows having all NULLs. Is it possible to upload rows having all column values as NULL.
Following is the snippet from the log:
2 Rows not loaded because all fields were null.
Edited by: Parag Kalra on May 4, 2010 3:31 AM

How HANA handle NULL values

Hi frzz,
Can any one explain me how exactly HANA handles NULL values??
Best Regards,
Krishna.

Hi Krishna,
You can use IFNULL for the SQL queries/script instead of ISNULL . Since ISNULL is binary function and will be mostly used for the CE Functions based Calc views.
Try using the same queries with IFNULL instead of ISNULL, it should work
Best Regards
Rahul Jha

Handling null column values

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