Database Procedure Calling by Using PreparedStatement and CallableStatement

Hi
We can execute Database Stored Procedure by using PreparedStatement and CallableStatement as well.Then what is the significance of having CallableStatement.
Please let me know the difference between these two Statement objects particularly in Stored Procedures Execution.
Thanks in advance
Basha007

A callable statement excecutes a stored procedure that's stored and run on the database server.
A prepared statement doesn't require a database stored procedure. It's parsed and cached by the JDBC driver, and allows you to specify parameters and bind values to them at runtime. Those are usually used in loop constructs where you want to repeatedly execute the same SQL with different values.
Not all RDBMS support stored procedures (e.g., MySQL), but every driver I've used allows PreparedStatements. - MOD

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Database connection pooling in ADF causing db procedure calls to use different transaction or session

We have developed an application using JDev Version 11.1.2.1.0 and the database is oracle 11g EE.
We have many database procedures or function calls from the model (AMImpl.java, VORowImpl.java) and the commit does not happen in the database and it happens from ADF. The database procedures are called in some valueChangeListnener and these procedures use the same transaction or session database session when called and update some records in some tables that are displayed in pages.
We started using connection pooling recently in our ADF application, -Djbo.doconnectionpooling=true -Djbo.txn.disconnect_level=1. When using connection pooling, we noticed that the database procedure calls use a different trasanction or different database session and the data or records that these procedures update is lost.
After removing the connection pooling, we noticed that the procedures again started using the same transaction or same database session and was working fine.
I want to know why this connnection pooling caused this issue and is there any fix for this when using connection pooling?

Take a look at
http://docs.oracle.com/cd/E15523_01/web.1111/b31974/bcampool.htm#CIHCHHEA
What You May Need to Know About Database User State and jbo.doconnectionpooling = true
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Using PreparedStatement and the Oracle Error ORA-1000

Hi,
I have a question about PreparedStatement objects that is not so simple to explain for me. What I would like to know is: if I use a PreparedStatement following traditional and generic steps:
1- PreparedStatement pStmt = Connection.prepareStatement(sQuery);
2- pStmt.setXXX(i,j);
n - pStmt.setXXX(i,j);
n+1 - ResultSet rs = pStmt.executeQuery();
n+2 - while(rs.next()){ ... retrive ResultSet data ... }
n+3 - rs.close()
n+4 - back to point number 2
and at the end (as you can see in the point numbered n+4), instead of closing the PreparedStatement pStmt using the close() method, I reuse the PreparedStatement pStmt comeing back to the point numebr 2 and setting again all its parameters with new values ... then ... what heppens in the Oracle database ? Has been the cursor (so the mamory area), associated to my PreparedStatement object pStmt, duplicated or is it the same ?
I know that Java allows you to do this kind of operations with PreparedStatement, and I know that in tha Java Documentation is explained to follow this strategy to optimize the execution time because in this way the same PreparedStatement is precompiled and prepared only once. But if I do a for loop following the steps explained before, after many iterations I have the error "ORA-1000: maximum open cursors exceeded". This error is the reason of my question. Does this error means that it's mandatory to close a PreparedStatement always, otherwise if you reuse it without closing it then the corresponding database cursor will be duplicated ? If it is so, then I think this is a contradiction with official java documentation ...
I'm using Oracle8i (version 8.1.7) and Oracle JDBC Thin Driver (Windows NT) for use with JDK 1.2.x. Moreover, in my database istance the parameter "maximum open cursor" is equal to 800 ...
Thank you very much for suggestions :-)

There is no need to close a prepared statement or its resultset for every iteration.
After the first iteration in a loop, all subsequent executions of it will close the previous resultset. By adding close() method, you are making one extra costly call to the DB for no reason.
Following is the sample code.I know what you are saying. In fact at the beginning I wrote my code in the same way of your sample (see the code of my first post at the begin of this page).
But doing so, after thousand iterations of the loop, I had "Oracle Error ORA-1000 : maximun open cursor exeeded" even if in my database istance the parameter "maximum open cursor" is equal to 8000.
At this moment in my code, for each iteration, I close the PreparedStatement and in this way I don't have anymore the error :-((
So it seems that only in theory we can reuse a preparedStatement without closing it. In fact if we see the oracle system table "$open_cursor" (as Konrad Pietzka suggest me) we can find that, for each interation,
at our line code "rs = pstmt.executeQuery();" correspond a new cursor in the database: this means that for each method "pstmt.executeQuery()" the database open a new cursor and do not use the previous one as it should.
I posted a question two months ago to search if someone had the same problem (it seems that Konrad Pietzka had the same situation) and was able to explain me what is the cause.
The only reason I found by myself for this problem, is that probably the Oracle JDBC Thin Driver for Windows NT/2000 has some bugs... but I'm not sure ...
Thank you very much for you time !!
bye :-))
Fidalma

Database procedure called from Forms

If a database procedure that updates a table is called from Oracle Forms, does it commit the changes automatically or do you have to issue a commit in Forms to commit the changes the database procedure has done, assumming there is no commits in the database procedure.
I'm not sure since I have seen cases where a commit was needed after the database procedure has been called and a case where a commit was needed. I checked the database procedure and there was no commits, there was a commit above the statement where the procedure was being called.

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by NAB ():
If a database procedure that updates a table is called from Oracle Forms, does it commit the changes automatically or do you have to issue a commit in Forms to commit the changes the database procedure has done, assumming there is no commits in the database procedure.
I'm not sure since I have seen cases where a commit was needed after the database procedure has been called and a case where a commit was needed. I checked the database procedure and there was no commits, there was a commit above the statement where the procedure was being called.<HR></BLOCKQUOTE>
Database procedure do have commit. You can issue commit in the procedure itself.
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Somehow ejbCreate method of an Entity EJB is not inserting a record into the database. I'm using BMP and calling the Entity bean method from a servlet. I'm using NAS 4.0 sp5 on Win 2k.

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Problem in using BLOB and callablestatement

Hi
I am doing an insert into the database , of which one of the clomn is
BLOB
when i do it using prepared statement , it does it fine
but if i do it using the callable statment (Stored procedure)its not
doing it .....
and gives an error like below
does anybod know what the problem is
java.sql.SQLException: ORA-06550: line 1, column 9:
PLS-00306: wrong number or types of arguments in call to 'IN
SERT_EVENT_LOG'
ORA-06550: line 1, column 9:
PL/SQL: Statement ignored
at weblogic.db.oci.OciCursor.getCDAException(OciCurs
or.java:228)
at weblogic.jdbcbase.oci.Statement.executeUpdate(Sta
tement.java:869)
at weblogic.jdbc20.pool.PreparedStatement.executeUpd
ate(PreparedStatement.java:47)
at weblogic.jdbc20.rmi.internal.PreparedStatementImp
l.executeUpdate(PreparedStatementImpl.java:54)
at weblogic.jdbc20.rmi.SerialPreparedStatement.execu
teUpdate(SerialPreparedStatement.java:55)
at com.expertcommerce.core.log.DatabaseLogService.in
ternalLog(DatabaseLogService.java:73)
at com.expertcommerce.core.log.BaseLogService.log(Ba
seLogService.java:33)
at com.expertcommerce.core.log.biz.ServerLogAdapter.
log(ServerLogAdapter.java:113)
at com.expertcommerce.core.log.biz.ServerLogAdapter.
logError(ServerLogAdapter.java:135)
at com.expertcommerce.core.users.biz.UserEntityBean.
ejbFindByPrimaryKey(UserEntityBean.java:409)
at com.expertcommerce.core.users.biz.UserEntityBeanH
omeImpl.findByPrimaryKey(UserEntityBeanHomeImpl.java:81)
at com.expertcommerce.core.users.biz.UserEntityBeanH
omeImpl.findByPrimaryKey(UserEntityBeanHomeImpl.java:49)
at weblogic.ejb.internal.EJBHomeImpl.remove(EJBHomeI
mpl.java:297)
at com.expertcommerce.core.users.biz.UserEntityBeanH
omeImpl_ServiceStub.remove(UserEntityBeanHomeImpl_ServiceStu
b.java:378)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBean.removeUser(UserManagerSessionBean.java:172)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBean.handle(UserManagerSessionBean.java:47)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBeanEOImpl.handle(UserManagerSessionBeanEOImpl.java:146)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBeanEOImpl_ServiceStub.handle(UserManagerSessionBeanEOImp
l_ServiceStub.java:255)
at com.expertcommerce.core.event.CoreEventDispatcher
.dispatch(CoreEventDispatcher.java:17)
at com.expertcommerce.core.event.biz.CoreEventDispat
cherSessionBean.dispatch(CoreEventDispatcherSessionBean.java
:24)
at com.expertcommerce.core.event.biz.CoreEventDispat
cherSessionBeanEOImpl.dispatch(CoreEventDispatcherSessionBea
nEOImpl.java:105)
at com.expertcommerce.core.event.biz.CoreEventDispat
cherSessionBeanEOImpl_WLSkel.invoke(CoreEventDispatcherSessi
onBeanEOImpl_WLSkel.java:159)
at weblogic.rmi.extensions.BasicServerObjectAdapter.
invoke(BasicServerObjectAdapter.java:338)
at weblogic.rmi.extensions.BasicRequestHandler.handl
eRequest(BasicRequestHandler.java:69)
at weblogic.rmi.internal.BasicExecuteRequest.execute
(BasicExecuteRequest.java:15)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.j
ava:120)
com.expertcommerce.core.log.LogServiceException: ORA-06550:
line 1, column 9:
PLS-00306: wrong number or types of arguments in call to 'IN
SERT_EVENT_LOG'
ORA-06550: line 1, column 9:
PL/SQL: Statement ignored
at com.expertcommerce.core.log.DatabaseLogService.in
ternalLog(DatabaseLogService.java:111)
at com.expertcommerce.core.log.BaseLogService.log(Ba
seLogService.java:33)
at com.expertcommerce.core.log.biz.ServerLogAdapter.
log(ServerLogAdapter.java:113)
at com.expertcommerce.core.log.biz.ServerLogAdapter.
logError(ServerLogAdapter.java:135)
at com.expertcommerce.core.users.biz.UserEntityBean.
ejbFindByPrimaryKey(UserEntityBean.java:409)
at com.expertcommerce.core.users.biz.UserEntityBeanH
omeImpl.findByPrimaryKey(UserEntityBeanHomeImpl.java:81)
at com.expertcommerce.core.users.biz.UserEntityBeanH
omeImpl.findByPrimaryKey(UserEntityBeanHomeImpl.java:49)
at weblogic.ejb.internal.EJBHomeImpl.remove(EJBHomeI
mpl.java:297)
at com.expertcommerce.core.users.biz.UserEntityBeanH
omeImpl_ServiceStub.remove(UserEntityBeanHomeImpl_ServiceStu
b.java:378)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBean.removeUser(UserManagerSessionBean.java:172)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBean.handle(UserManagerSessionBean.java:47)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBeanEOImpl.handle(UserManagerSessionBeanEOImpl.java:146)
at com.expertcommerce.core.users.biz.UserManagerSess
ionBeanEOImpl_ServiceStub.handle(UserManagerSessionBeanEOImp
l_ServiceStub.java:255)
at com.expertcommerce.core.event.CoreEventDispatcher
.dispatch(CoreEventDispatcher.java:17)
at com.expertcommerce.core.event.biz.CoreEventDispat
cherSessionBean.dispatch(CoreEventDispatcherSessionBean.java
:24)
at com.expertcommerce.core.event.biz.CoreEventDispat
cherSessionBeanEOImpl.dispatch(CoreEventDispatcherSessionBea
nEOImpl.java:105)
at com.expertcommerce.core.event.biz.CoreEventDispat
cherSessionBeanEOImpl_WLSkel.invoke(CoreEventDispatcherSessi
onBeanEOImpl_WLSkel.java:159)
at weblogic.rmi.extensions.BasicServerObjectAdapter.
invoke(BasicServerObjectAdapter.java:338)
at weblogic.rmi.extensions.BasicRequestHandler.handl
eRequest(BasicRequestHandler.java:69)
at weblogic.rmi.internal.BasicExecuteRequest.execute
(BasicExecuteRequest.java:15)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.j
ava:120)
with parameter
exitsfalse
Retuening result to CoreEventcom.expertcommerce.core.users.e
vents.RemoveUserEvent@6dcc33
Stored Procedure .....
CREATE or replace procedure insert_Event_Log
pEvent_ID in out number,
pEvent_Severity in number,
pEvent_Data in blob,
pEvent_Action in number,
pEvent_Time in date,
pEvent_Source in char,
pEvent_Status in char,
pEvent_User in char,
pEvent_Subject in char,
pEvent_Subject_ID in char
AS
tEvent_ID number;
BEGIN
/* Get the sequence key */
if (pEvent_ID is null ) then
select event_id_seq.nextval into tEvent_ID from dual;
insert into Event_ID (pkey, justabit) values ( tEvent_ID, 1);
end if;
/* Insert the values in the table */
INSERT INTO Event_Log
Event_ID,
Event_Severity,
Event_Data,
Event_Action,
Event_Time,
Event_Source,
Event_Status,
Event_User,
Event_Subject,
Event_Subject_ID
VALUES (
tEvent_ID,
pEvent_Severity,
pEvent_Data,
pEvent_Action,
pEvent_Time,
pEvent_Source,
pEvent_Status,
pEvent_User,
pEvent_Subject,
pEvent_Subject_ID
pEvent_ID := tEvent_ID;
END;
My TEst Program
import java.sql.*;
import java.util.Properties;
import oracle.jdbc.driver.*;
import oracle.sql.*;
class rfxtest{
public static void main(String[] args){
rfxtest test = new rfxtest();
CallableStatement m_stmt = null;
PreparedStatement pStmt = null;
String rfxdata = "this is the test data for the event-blob-test";
try{
Connection con = test.getConnection();
String temp = "call insert_event_log ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
m_stmt = con.prepareCall(temp);
m_stmt.setNull(1, java.sql.Types.INTEGER);
m_stmt.setInt(2, 123);
m_stmt.setBytes(3, (byte[])rfxdata.getBytes());
m_stmt.setInt(4, 123);
m_stmt.setTimestamp(5, new java.sql.Timestamp(System.currentTimeMillis()));
m_stmt.setString(6, "xxxxxxxxxx");
m_stmt.setString(7, "xxxxxxxxxx");
m_stmt.setString(8, "xxxxxxxxxx");
m_stmt.setString(9, "xxxxxxxxxx");
m_stmt.setString(10, "xxxxxxxxxx");
m_stmt.executeUpdate();
String selectStmt = " select event_data from event_log where event_id = 12345" ;
pStmt = con.prepareStatement(selectStmt);
ResultSet rs = pStmt.executeQuery();
if(!rs.next()){
System.out.println("error");
} else {
Blob b = rs.getBlob(1);
byte[] blob = (byte[])b.getBytes(1,(int)b.length());
String s = new String(blob);
System.out.println("The blob content is : "+s);
}catch(Exception e){
e.printStackTrace();
public Connection getConnection(){
try{
Properties props = new Properties();
props.put("user", "nexgen");
props.put("password", "nexgen");
Driver myDriver = (Driver) new oracle.jdbc.driver.OracleDriver();
Connection conn =
myDriver.connect("jdbc:oracle:thin:@192.168.254.6:1521:ecw",props);
return conn;
catch(Exception e){
e.printStackTrace();
return null;
appreciate response
venki
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Questions about Oracle products and technologies will NOT be answered in this forum. Please post your product or technology related questions in the appropriate product or technology forums, which are monitored by Oracle product managers.
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XIer

Hey
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buffer.append(")");
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cursor.setString(1, plannerObj);
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Message was edited by:
omitchel

I tried customizing the Quoting Form, it works.
What you have done is correct, but this is how you call it
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db_proc('''||${item.qothddet_main.quote_name.value}||''');
end'
here
qothddet_main : block name
quote_name : item name
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Thanks..

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cheers

Database Procedure Calling by Using PreparedStatement and CallableStatement

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