Set null in PreparedStatement

Hi
I need to set null as a parameter in the PreparedStatement (that will behave as "is null" ).
the PreparedStatement.setNull is not working.
any ideas???

How did you use setNull() in your code? I'm sure there must be something wrong with the way you coded it.

Similar Messages

SET NULL not working in SQL*Plus

DB Version: 10.2.0.4
Question1.
Won't SET NULL work with PL/SQL block?
Question2.
Why is <<>> appearing in several lines (one character per line) as shown below? Sorry about the "jive-quote" thing below, got that after i added code tags.
SQL > show lines
linesize 80
SQL > show pages
pagesize 14
SQL > set null <<>>
SQL > select null from dual;
N
<
<
>
>
SQL > set serveroutput on
SQL > declare
2 v_Val VARCHAR2(100) :='COCOJUMBO';
3 BEGIN
4 SELECT null INTO v_val from dual ;
5 DBMS_output.put_line(v_val);
6 EXCEPTION
7 WHEN NO_DATA_FOUND THEN
8 dbms_output.put_line('Exception:'||SQLERRM);
9 END;
10 /
PL/SQL procedure successfully completed.
SQL >

user872043 wrote:
DB Version: 10.2.0.4
Question1.
Won't SET NULL work with PL/SQL block?No. SET NULL is a SQL*Plus command, not a PL/SQL command.
Question2.
Why is <<>> appearing in several lines (one character per line) as shown below? Sorry about the "jive-quote" thing below, got that after i added code tags.That's due to default formatting. For example:
SQL> SET NULL <<>>
SQL> SELECT NULL FROM DUAL;
N
<
<
>
>
SQL> COLUMN col FORMAT A4
SQL> SELECT NULL col FROM DUAL;
COL
<<>>

How to set Delete Rule to SET NULL while designing relational model .

Dear All,
Am new to SQL Developer Data Modeler and was doing some relational and logical design using Data modeler and i want to generate DDL script, while doing i was struck up with this issue.
I have two table and tried to give Primary key and Foreign key relationship, in foreign key table i want to set the Delete rule has SET NULL, but it is not found. I have other three options like CASCADE, RESTRICT,NO ACTION. Whereas in logical design i can find SET NULL, NO ACTION and RESTRICT....
But the DDL script is getting generated based on Relational design , i want to set foreign key has SET NULL in delete rule how to accomplish that?
Please help me......
Thanks in Advance
Ramkumar.S

Hi Ramkumar,
If you unset the Mandatory property on the Foreign Key, you should then be able to set the Delete Rule to SET NULL.
David

What is the use of setting null values to Objects?

What is the use of setting null values to Objects?
regards,
namanc

It's more of a safety trap within java to handle the "programmers are still humans" exception.
String myname;
// print what???? Forgot to initialize the name!
System.out.println(myname);Java will complain about myname not being initialized. It won't when you do this:
String myname = null;
// allright, your name is null
System.out.println(myname);In the second case you are showing to java that you know what you are doing.

Setting null values to view.attributes

Hi all, I am getting following NPE posting form to server. Below I m writing snippet of code which causes the issue:
SEVERE: value is null for a not available property: test
java.lang.NullPointerException: value is null for a not available property: test
     at javax.faces.component._ComponentAttributesMap.put(_ComponentAttributesMap.java:303)
     at javax.el.MapELResolver.setValue(MapELResolver.java:90)
     at javax.el.CompositeELResolver.setValue(CompositeELResolver.java:69)
     at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.setValue(FacesCompositeELResolver.java:180)
     at org.apache.el.parser.AstValue.setValue(AstValue.java:158)
     at org.apache.el.ValueExpressionImpl.setValue(ValueExpressionImpl.java:249)
     at org.apache.jasper.el.JspValueExpression.setValue(JspValueExpression.java:85)
     at javax.faces.component.UIInput.updateModel(UIInput.java:287)
     at javax.faces.component.UIInput.processUpdates(UIInput.java:214)
     at javax.faces.component.UIForm.processUpdates(UIForm.java:99)
     at org.ajax4jsf.component.AjaxViewRoot$2.invokeContextCallback(AjaxViewRoot.java:424)
     at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:240)
     at org.ajax4jsf.component.AjaxViewRoot.processUpdates(AjaxViewRoot.java:440)
     at org.apache.myfaces.lifecycle.UpdateModelValuesExecutor.execute(UpdateModelValuesExecutor.java:33)
     at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:103)
     at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:76)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:151)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:341)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
     at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
     at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
     at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
     at java.lang.Thread.run(Unknown Source)My Jsp Page code snippet:
<t:selectOneMenu value="#{view.attributes['test']}">
     <f:selectItems value="#{myController.listValues}"/>
</t:selectOneMenu>MyController.java bean property:
public List<SelectItem> getListValues() {
          listValues.clear();
          SelectItem si = new SelectItem("", "-Select-");
          SelectItem si2 = new SelectItem("1", "1");
          SelectItem si3 = new SelectItem("2", "2");
          listValues.add(si);
          listValues.add(si2);
          listValues.add(si3);
          return listValues;
     }When user selects nothing, I need to set NULL value for this drop down. Kindly suggest if there is any other way or best practice to do the same.I am using Myfaces 1.2.5 for JSF 1.2. This thing was working fine in Myfaces 1.1.5 for JSF 1.1.Any suggestions?

Give this a try:
<t:selectOneMenu value="#{view.attributes['test']}">
        <f:selectItem itemLabel="-Select-" />
     <f:selectItems value="#{myController.listValues}"/>
</t:selectOneMenu>
public List<SelectItem> getListValues() {
          listValues.clear();
          listValues.add(new SelectItem("1", "1");
          listValues.add(new SelectItem("2", "2");
          return listValues;
     }Note: I cleaned up your getListValue() a bit - most of the changes are cosmetic except for removing you '-Select-' selectItem. Also, why do you use a class level variable if you are generating it on each call? Either generate the list on constructor call (or when needed) and just return it from getListValues(), or simply use a local variable.

"Cannot set null table model"

How do I get rid of the pop-up error msg when
clicking on an EJB (in the System Window of
a writable Project file):
"Cannot set null table model"

This error usually occurs when a compilation error is blocking creation of a valid EJB model, the data object that supports the EJB class editor.
Try re-compiling the project to see if that identifies the problem.

Can I set null to the "DiscoGroup.0.stdout" ?

Dear all:
Can I set null to the "DiscoGroup.0.stdout" ?
Because this file is too big 22G,so I want to set null to this file , can I do this action ?
[appfmrlt@csslxa02 jvm]$ pwd
/u01/oracle/fmrlt/ora/iAS/Apache/Jserv/logs/jvm
-rw-r--r-- 1 appfmrlt dba 22G May 18 09:33 DiscoGroup.0.stdout
My environment: oracle ebs 11.5.9 | Red Hat 3.0 | oracle 9.2.0.3
Regards
Terry

Terry,
Yes, it is safe to do. You may take a backup of the files or rename it, and you better stop Apache before doing so then bring it up again.
Thanks,
Hussein

Set null to :system.current_item

I need to set null to an item in my form. Usually I'll use for example
:emp.empid:='';
But I plan to use this Program Units in some items so I decide to use :system for example
PROCEDURE date_check IS
x varchar2(10);
v_item varchar2(50):= name_in(:system.current_block||'.'||:system.current_item);
begin
//some conditions here//
     //some conditions here//
     if x is not null then begin
     v_item := '';
     raise form_trigger_failure;
     end;
     end if;
end;
I set sysdate as an initial data of the item. But when I run the form it returns error. Can somebody help me to set null to that item using :system.itemname
Thanks.
Regards,
firman

name_in gets the value of the item. So you should use copy.
copy('',:system.current_block||'.'||:system.current_item)

HOWTO: retrieve FK constraint "on delete set null" info from dictinionary?

Hi !
Selecting from USER_CONSTRAINTS column DELETE_RULE only lists "CASCADE" or "NO ACTION" but not "SET NULL". Is there another table I can use?
TIA,
Stefan

Hi Again,
after a short coffe break I found the solution myself: in Oracle8i the view definitions for USER_CONSTRAINTS is wrong. The decode for DELETE_RULE just misses value 2 in column REFACT for "SET NULL".
Stefan

Sqlplus 'set null'

Again, new to sqlplus and Oracle, so thanks in advance.
I am using 'set NULL "0"' to print a zero when I have a null value.
The problem I am having is that the "0" that is printing does not
seem to be behaving like the other column values (which are numbers).
set heading off
set echo on
set newpage 1
set pagesize 55
set linesize 66
column FW_STREAM_NAME FORMAT a20
column SUM(TOTAL_RECORDS) FORMAT 9,999 JUSTIFY RIGHT
--set NULL '0'
SELECT FW_STREAM_NAME, SUM(TOTAL_RECORDS) from BL_STATISTICS_FILE WHERE created_timestamp between
TO_DATE('20100826000000','yyyymmddhh24miss') AND
TO_DATE('20100826235900','yyyymmddhh24miss') GROUP BY FW_STREAM_NAME
and here is the output:
APPLES12345 2,810
ORANGES3456 36
BANANAS12456 16
PEARS6789 0
CHERRIES 131
Everything is lined up except my special column, where sqlplus has replace the null with
a "0" as I asked it to.
How can I get it to line up with the rest of the numerical column entries?
Thanks,
Mitch

Try this:
SQL> column sal FORMAT 9999999 JUSTIFY RIGHT
SQL> ed
Wrote file afiedt.buf
1 select empid,salary sal from emp
2 UNION
3* SELECT empid,NVL(NULL,0) FROM emp
SQL> /
     EMPID      SAL
         1        0
         1     1002
         2        0
         2     2002
         3        0
         3     3002
         4        0
         4     4002
         5        0
         5     2000
         6        0
         6     2345
         7        0
         7    12345
        10        0
        10    12121
16 rows selected.
SQL> Edited by: AP on Aug 27, 2010 9:07 AM

Should i set null those reference variable object created inside of funtion

hi,
I create object inside of a member function . after finish execute that method those variable should set null to be garbage collection or no need ?
   public void sampleFun(){
       Object obj = new Object();
        // some work
     obj = null ; //// ----------- > this need or not ?
}after finished that method execution should i set
   obj = null;explicitly or no need ?? plz

No, there's no need.
When the reference variable passes out of scope, it ceases to exist, so it doesn't reference the object any more. As soon as an object has no references pointing to it, it is available for garbage collection.
Your rule of thumb should be: don't do anything about garbage collection unless you know why you're doing it. And even then don't do it unless you can prove you need to.
Dave.

Null in PreparedStatement update

I am having trouble updateing values with a PreparedStatement when I use null as a value for one of the parameters. Example:
String sql = "UPDATE MYTABLE SET MYFIELD = ? WHERE MYKEY = ?";
PreparedStatement query = myConnection.prepareStatement(sql);
query.setString(1, null);
query.setString(2, "KEYVALUE");
query.executeUpdate();
This always results in the following error:
java.sql.SQLException: Missing IN or OUT parameter at index:: 1
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:187)
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:229)
     at oracle.jdbc.driver.OracleStatement.checkBindsInAndOut(OracleStatement.java:1876)
     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2476)
     at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:452)
Is there another way to update something with a null value using a prepared statement?

Use
query.setNull(1,oracle.jdbc.OracleTypes.VARCHAR);
instead of query.setString(1, null);No, I tried that and it does not work either. The only time I am able to use nulls for the values in a prepared statement is if it is an insert statement. It does not seem to be possible with an update. Could someone verify that this is true?

How to set null value for a date column using database adapter

Hello,
I have a table wih 3 columns
(id NUMBER,
modified_on DATE
contentText VARCHAR2)
I have a row wih theses values (1, 20/03/2010 16:30, 'coucou')
I want use a DB adapter in a BPEL process to change the value of column modified_on to (null). I'm using the out-of-he box "update" method (no custom sql, nieher "insert or update (merge)" method)
- If I only set values of "Id" and "contentText" -> insert is done but I missed the modification of "modified_on" to (null)
- If I set all values and use expression '' (2 single quote without any space) for modified_on I got an error on update
BWriteInteractionSpec Execute Failed Exception.
update failed. Descriptor name: [DBUTFORM.TForm]. [Caused by: String index out of range: 10]
Caused by Exception [TOPLINK-3001] (Oracle TopLink - 10g Release 3 (10.1.3.3.0) (Build 070608)): oracle.toplink.exceptions.ConversionException
Exception Description: The object [xs:datetime], of class [class java.lang.String], could not be converted to [class java.sql.Timestamp].
Internal Exception: java.lang.StringIndexOutOfBoundsException: String index out of range: 10.
Thanks for help

1008318 wrote:
its my personal need..then it is a very bad personal need. DATE is not an appropriate type to be using for a primary key, as it cannot be guaranteed to be unique, especially when inserting multiple rows at once.
You would be better working to business needs and implementing correct technical solutions to those needs, than to just do things based on your personal needs.

Setting null values vs Default or initial values in the Database?

i am working on a system and i have set any field that might optional as Allow Null,, but this is causing me a lot of troubles especially when i am querying the data or perfoming some calculations from the database. So is it valid if i changed all the Allow null field to have initial values an restricting null values to be inserted into them, so example, to set the initial values for an integer to be 0 and string to be empty?

Hi,
You can implement business logic on db side or on app side.
Advantage and disadvantage of implementation business logic on DB side.
Advantages:
1.Don't require app server software version changes/compilations (Java, C, C++, C#...)
2.Stored procedures are stored directly in the db.
3.DBA can manage and optimize the stored procedures in flexible way; it'll be transparent for app server because the same remaining interface.
4.Avoidance of network traffic - the stored procedures can run directly within DB engine.
5.Encapsulation of business logic as API in the database.
6.Reports can be implemented like PL/SQL functions that return table data type. The functions can be called from application side - sort of API.
Disadvantages:
1.DB vendor specific, but when dealing with the same databases (for example Oracle) it's not relevant.
2.Require DB skills to write the procedures correctly: it will require time for a pure java/c/c++/c# programmer to understand the DB code and to write it in optimal (from db point of view) way.
3.If it's too complex business logic - the db side implementation can become too complex.
To overcome issue with null(s) please use NVL function.
Example:
drop table TEST_TABLE;
create table TEST_TABLE(parameter varchar2(20), val number(10, 2));
insert into TEST_TABLE values ('A', 23.245);
insert into TEST_TABLE values ('B', null);
insert into TEST_TABLE values ('C', 123);
insert into TEST_TABLE values ('D', null);
select avg(nvl(val, 0)) from TEST_TABLE;Hope this will help.
Best Regards,
http://dba-star.blogspot.com/

Result set null

Hello techies,
I am doing simple program, which is connecting to mysql server and retreiving the results from my database using servlets.
I want to do if the result set is returning zero rows i.e if there is no matching rows is available in the table, which i had specified in my query.
Here is my code
String url = "jdbc:odbc:testDSN";
Properties p = new Properties();
p.put("user", "root");
p.put("password", "kkkk");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn = DriverManager.getConnection(url, p);
System.out.println("connection established");
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select *from test.emp where empNumber =15");
System.out.println("resultset is null" + rs.wasNull());
if (rs.getRow() == 0) {
System.out.println("nomatching subject is found");
out.println("No Matching subject is found");
else {
out.println("<TABLE CELLSPACING=\"0\" CELLPADDING=\"3\" BORDER=\"1\">");
out.println("<TR><TH>eno</TH><TH>ename</TH><TH>date</TH></TR>");
// Loop through results of query.
while (rs.next() == true)
out.println("<TR>");
out.println("<TD>" + rs.getString("eno")+ "</TD>");
out.println("<TD>" + rs.getString("ename") + "</TD>");
out.println("<TD>" + rs.getString("date") + "</TD>");
out.println("</TR>");
Here if there are no employe record matching eno =15 in my table then i want to print no matching record is found.
where i am making mistake??
plz help me .
It is very urgent.
Thanks (inadvance)
regards,
ramu

Good Lord, you have database and HTML generation code in the same method?
This is not the way to do JDBC code. Start with a tutorial.
Ever read about object-oriented programming? How 'bout starting with an Employee class that has id, name, and date (what date? birth date? employment date? termination date?) as attributes. Then write a data access object that can do all the database stuff on Employee's behalf, without any consideration for UI. Test that on the command line until you have it working perfectly. THEN worry about how you'll display results to the user.
Your JDBC code isn't right. wasNull() checks to see if the column result is null, not the result set itself. (ResultSet can never be null; read the javadocs). You'd be getting a NullPointerException if ResultSet was null, wouldn't you?
Your code deserves a SERIOUS rewrite, which I'm not inclined to do for you. But I would recommend something more along these lines:
// hardwired url, driver, and query? oh, my - that's bad.
String url = "jdbc:odbc:testDSN";
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn = DriverManager.getConnection(url);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select * from emp where empNumber =15");
// you're obviously putting this in a servlet - bad idea.
// ever heard of JSPs?
out.println("<TABLE CELLSPACING=\"0\" CELLPADDING=\"3\" BORDER=\"1\">");
out.println("<TR><TH>eno</TH><TH>ename</TH><TH >date</TH></TR>");
// Loop through results of query.
while (rs.next())
out.println("<TR>");
out.println("<TD>" + rs.getString("eno")+ "</TD>");
out.println("<TD>" + rs.getString("ename") + "</TD>");
out.println("<TD>" + rs.getString("date") + "</TD>");
out.println("</TR>");
}%

Set null in PreparedStatement

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