Java Class - Oracle Stored Procedure - ABAP Program

My client asked me to design a Java Class that calls a Oracle stored procedure. I was a Java developer so I can do that part. Now this Java Class will be called by a ABAP program. All the data that I got from Oracle Stored Procedure should be retuned to the calling ABAP program.
In the past I did use JCA and SAP Connectors to get data from SAP R3 by calling BAPI programs.
I would like to know if the ABAP program uses JCO or the latest JCA based SAP Connectors. Any advice on how I should structure my Java Program is welcome. I do know from pure Java side how to get data from Oracle database using JDBC.

Hi venkat,
This link(PDF) gives good info about JCO.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/c63bca90-0201-0010-59ae-e0db32750209
JCO is used as two way communication between JAVA and R/3. so for yours JCO may be the suitable one.
regards,
P.Venkat
Message was edited by: venkataramanan

Similar Messages

Error calling Java in Oracle Stored Procedure

I can call a java function inside my Oracle Stored Procedure, but if I reference a class that uses JNI, I get problems. I don't know what forum to post this under. This seems the closest match.
Here is my error:
java.lang.NoClassDefFoundError
at AcmeComp.ec.Motor.<init>(Motor.java:35)
at BBOra.runBB(BBOra:13)
Here is my java class, BBOra.java:
import AcmeComp.ec.*;
class BBOra {
static String strCnt;
BBOra() {}
public static void runBB() {
try {
//Motor class is in AcmeComp.ec package
Motor eng = new Motor();
} catch(Exception e) {
System.out.println("Error: " + e);
public static void runNonBB() {
System.out.println("runNonBB works ok.");
From DOS prompt, I loaded ac222ec.jar (has the AcmeComp.ec package) and BBOra.java files into Oracle:
loadjava -u system/manager -resolve -verbose ac222ec.jar.java
loadjava -u system/manager -resolve -verbose BBOra.java
From SQL Plus, I created 2 stored sprocedures:
CREATE OR REPLACE PROCEDURE runBB
AS LANGUAGE JAVA
NAME 'BBOra.runBB()';
CREATE OR REPLACE PROCEDURE runNonBB
AS LANGUAGE JAVA
NAME 'BBOra.runNonBB()';
From SQL Plus, I gave myself permissions to load libraries, so I can load ac222ecjni.dll, which has all the Native (C++) code I use:
BEGIN
DBMS_JAVA.GRANT_PERMISSION('SYSTEM',
'java.lang.RuntimePermission',
'loadLibrary.*');
END;
From SQL Plus, I set up my output:
set SERVEROUTPUT ON;
CALL dbms_java.set_output(3000);
From SQL Plus, I called my Stored Procedures:
CALL runNonBB();
CALL runBB();
runNonBB() works great, but runBB() gives me the error I listed above. The Motor class that BBOra calls, itself calls a class NMotor, which has a call:
static {
System.loadLibrary("ac222ecjni");
Unfortunately, I don't know the inner workings of the native code. Does "at AcmeComp.ec.Motor.<init>(Motor.java:35)"? mean JServer was able to see the class "Motor", but not instatiate it? Or did it error trying to create the class "NMotor"?
Here's a snippet of Motor:
package AcmeComp.ec;
public class Motor implements IMotor {
public Motor() {
motor = new NMotor();
some functions
private NMotor motor;
Here's a snippet of NMotor:
package AcmeComp.ec;
class NMotor {
NMotor() {
sunjdk = true;
some native method declarations
private boolean sunjdk;
static {
//ac222ecjni.dll has all the Native (C++) code
System.loadLibrary("ac222ecjni");
PLEASE HELP ME FIGURE THIS OUT. IT IS KILLING ME. I can even look into the USER_OBJECTS view in Oracle and see that ALL of the classes from the ac222ec.jar are present and accounted for.

Man, I guess I figured it out myself. Ten Duke dollars to myself. But, for the sake of anyone who may want to know the answer, here it is:
JServer (or Oracle9i JVM in Oracle 9i) does not support JNI. Here is their (weak) reasoning, taken from "Oracle9i Java Developer's Guide" as found in http://www.csis.gvsu.edu/GeneralInfo/Oracle/java.920/a96656/invokeap.htm#1007948
"Oracle does not support the use of JNI in Oracle9i Java applications. If you use JNI, your application is not 100% pure Java, and the native methods require porting between platforms. Native methods have the potential for crashing the server, violating security, and corrupting data."
Sounds like a fancy way to say they have a limitation--their JVM isn't up to par all the way. If JNI is a feature in Java, why should Oracle decide for me if I should use it? Don't Java methods also have the potential for crashing the server, violating security, and corrupting data? I think they should just provide the functionality you would expect from a VM and let the user decide which functionality to use. In my case, I HAVE to use JNI, so I'd have to use RMI so that a different VM can do the JNI part.
Sounds pretty lame of Oracle, but oh well.

Pass xmltype to oracle stored procedure

I need to pass an xmltype from java to an oracle stored procedure. Does anybody have any sample code to do this? I am using jdeveloper 10.1.2
Thanks
MM

Oracle provides several ways of passing objects to and from java to Oracle Stored Procedure.
One way is to directly create oracle.sql.STRUCT object and pass array of values to this object. Another way is to implement java.sql.SQLData or oracle.sql.ORAData interfaces in your class and pass this class to setObject function.
It is all well described in manual in chapter "Working with Oracle Object Types", there is also a lot of examples in this chapter and on the web.
http://download-uk.oracle.com/docs/cd/B19306_01/java.102/b14355/oraoot.htm - Working with Oracle Object Types
Some of the examples:
http://www.oracle.com/technology/sample_code/tech/java/sqlj_jdbc/files/advanced/ObjectOracleSample/Readme.html
http://javaalmanac.com/egs/java.sql/InsertObjectOraclePreparedStatement.html

Calling Java programs from Oracle Stored Procedure

Is it possible to call Java programs from Oracle stored procs? If possible Can this be used to exchange data from other applications? Is there a better method/feature in oracle for doing data exchange with other apps?

If what you mean by Oracle stored procedures is pl/sql then yes.
You can create a "wrapper" this way:
CREATE OR REPLACE FUNCTION xmlXform
in_mapUrl IN VARCHAR2,
in_inputUrl IN VARCHAR2
RETURN VARCHAR2
AS
LANGUAGE JAVA NAME
'com.yourcompany.xml2any.xform(java.lang.String,java.lang.String)
RETURN java.lang.String';
Then load the java as:
loadjava -user youruser/youruserpasswd -resolve -verbose lib/xmlparserv2.jar classes/com/yourcompany/xform.class classes/com/yourcompany/xml2any.class
The java, given the correct permissions, can do anything java can do including communicate with outside applications.
Is this the "best" way... depends on what you are trying to accomplish.

Calling a java class in my oracle database from a oracle stored procedure

my oracle stored procedure is:
create or replace
PROCEDURE openpdffile
AS LANGUAGE JAVA
NAME 'pdfopenbook.mainbook()';
it is valid and so is this java class;
import java.sql.*;
import oracle.jdbc.*;
public class pdfopenbook //class pdfopen
public static void mainbook(String args[]) //main function
try //try statement
Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "c:\\temp
final_book.pdf");
// Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "sol.exe");
} catch (Exception e) //catch any exceptions here
System.out.println("Error" + e ); //print the error
but i get the error:
onnecting to the database caprs.
ORA-29531: no method mainbook in class pdfopenbook
ORA-06512: at "CAPRS.OPENPDFFILE", line 1
ORA-06512: at line 2
Process exited.
Disconnecting from the database caprs.
it says there is no mainbook method but there is, what am i doing wrong??
Thanks,
Doug

Pass String[] as an argument to mainbook():
create or replace PROCEDURE openpdffile
AS LANGUAGE JAVA
NAME 'pdfopenbook.mainbook(java.lang.String[])';Have you posted it on the Database forum?
Regards,
Nick

Calling a java class from an oracle stored procedure

my oracle stored procedure is:
create or replace
PROCEDURE openpdffile
AS LANGUAGE JAVA
NAME 'pdfopenbook.mainbook()';
it is valid and so is this java class;
import java.sql.*;
import oracle.jdbc.*;
public class pdfopenbook //class pdfopen
public static void mainbook(String args[]) //main function
try //try statement
Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "c:\\temp\\final_book.pdf");
// Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "sol.exe");
} catch (Exception e) //catch any exceptions here
System.out.println("Error" + e ); //print the error
but i get the error:
onnecting to the database caprs.
ORA-29531: no method mainbook in class pdfopenbook
ORA-06512: at "CAPRS.OPENPDFFILE", line 1
ORA-06512: at line 2
Process exited.
Disconnecting from the database caprs.
it says there is no mainbook method but there is, what am i doing wrong??
Thanks,
Doug

http://wiki.answers.com/Q/Can_you_call_a_java_function_from_an_oracle_stored_procedure

Problem in calling Oracle stored procedure from Java.

I am trying to invoke the Oracle stored procedure from Java. The procedure does not take any parameters and does not return anything. If I call it from SQL prompt it is working perfectly. I am calling it in my program as follows.
callable_stmt=con.prepareCall("{call pkg_name.proc_name()}");
callable_stmt.execute();
The problem is the control-of-flow is getting strucked in the second line I wrote. It is not giving any error also.
Please clarify me what's wrong with my code?
Seenu.

And how long does the stored procedure take to run from your client machine when running it via sqlplus?

Errors in calling Oracle stored procedure using java CallableStatement

Hello,
I have an oracle stored procedure below, it has been tested in PL/SQL without errors. During testing, in_c_file_type="F"; out_n_seqno_freeformat=120139596 and out_n_seqno_commaseprated is null (empty in value column).
When I run the program in Eclipse (windows xp), error messages is below: (It stopped at line 'cstme.execute();' )
Message:ORA-06550: line 1, column 26: PLS-00103: Encountered the symbol "" when expecting one of the following: . ( ) , * @ % & | = - + < / > at in is mod remainder not range rem => .. <an exponent (**)> <> or != or ~= >= <= <> and or like LIKE2_ LIKE4_ LIKEC_ as between from using || indicator multiset member SUBMULTISET_ The symbol ", was inserted before "" to continue. Error code:6550 SQL statement:65000 {code} Does anyone know what cause the error? It seems like something is missing in the stored procedure. But the stored procedure passes the test in the PL/SQL. The oracla driver I used is Oracle thin driver. Oracle version is 10.2.g Thanks in advance. northcloud {code} create or replace procedure SP_GET_SEQNO_2( in_c_file_type in char, out_n_seqno_freeformat out integer, out_n_seqno_commaseprated out integer) is n_seqno_commaseprated integer; n_seqno_freeformat integer; begin if in_c_file_type ='F' THEN SELECT message_counter.nextval INTO n_seqno_freeformat FROM dual; insert into temp_stroperations (record_id,OUTPUT_STR,INPROCESS_STR) values (n_seqno_freeformat,empty_clob(),empty_clob()); elsif in_c_file_type ='C' THEN SELECT message_counter.nextval INTO n_seqno_commaseprated FROM dual; insert into temp_stroperations (record_id,OUTPUT_STR,INPROCESS_STR) values (n_seqno_commaseprated,empty_clob(),empty_clob()); else SELECT message_counter.nextval INTO n_seqno_freeformat FROM dual; insert into temp_stroperations (record_id,OUTPUT_STR,INPROCESS_STR) values (n_seqno_freeformat,empty_clob(),empty_clob()); SELECT message_counter.nextval INTO n_seqno_commaseprated FROM dual; insert into temp_stroperations (record_id,OUTPUT_STR,INPROCESS_STR) values (n_seqno_commaseprated,empty_clob(),empty_clob()); end if; out_n_seqno_freeformat := n_seqno_freeformat; out_n_seqno_commaseprated := n_seqno_commaseprated; end SP_GET_SEQNO_2; {code} ----- A part of java code I used to call the stored procedure is here. {code} String escapeString = "{call SP_GET_SEQNO_2 (? ? ?)}"; CallableStatement cstme = null; try { cstme = con.prepareCall(escapeString); cstme.setString(1, "F"); cstme.registerOutParameter(2, java.sql.Types.INTEGER); cstme.registerOutParameter(3, java.sql.Types.INTEGER); cstme.execute(); int seqNoFreeformat=0, seqNocommasepreted=0; seqNoFreeformat = cstme.getInt(2); seqNocommasepreted = cstme.getInt(3); System.out.println ("In ConvertXML.processStoredProcedure(), seqNoFreeformat= "+seqNoFreeformat+";seqNocommasepreted="+seqNocommasepreted); } catch (SQLException e) { //System.out.println ("In ConvertXML.processStoredProcedure(), SQLException: "+e); System.err.println("Message:"+e.getMessage()); System.err.println("Error code:"+e.getErrorCode()); System.err.println("SQL statement:"+e.getSQLState()); log.log(Level.INFO, log.getName() + " - SQLException : "+e); } {code}

es5f2000 wrote:
jschell wrote:
That works?I dunno. The below definitely works, but like I said, I've only
ever done it with one output parameter (and that has always
been a ResultSet).
String callableQuery = "{?= call my_package.my_call(?, ?)}"
Yes I have done that and at least in terms of my code it wasn't just a result set.
But not with two.

Java App connection to an Oracle Database through Oracle Stored Procedure

My team's access to its Databases (Oracle only) is restricted to access through Oracle Stored Procedures that are part of the Oracle Database. So, in my Java App I need to call the Stored Procedure that will give me the access to the table that I need, declare the right parameters and execute the command. The Stored Procedure will then hand me the data I need.
I am finding support on the web for creating Stored Procedures in Java, but that is not what I need.
Can anyone post here a class that addresses this, or point me to a link that will shed some light on it?
Thanks
user606303

user606303 wrote:
Sorry this code is unformatted - I can't see how to format it.Use \ tags
I am looking for Java code that will do what this .NET code below does (connects to a database and writes data to the table through an Oracle stored procedure that is part of the Oracle Database.)
So learn Java, learn JDBC and translate the requirements; don't attempt to translate the code as the platforms are too different.
From a quick glance it looks like a JDBC CallableStatement can do the job.

Problem in writting oracle stored procedure in java

Hi,
Can anybody please suggest me how can I access oracle stored procedure in Java.
Thanks

please find the examples in the below url.
http://javaalmanac.com/egs/java.sql/pkg.html

Oracle stored procedure works in toad but lots of error in java

I've tested this stored procedure in toad 7.3 and it completes ok.
I do pass the same IN parameters and OUT parameters.
I registered the out parameter as a OracleTypes.CURSOR
if it works in toad or pl/sql, what is wrong? how can this be fixed.
however, when i execute this in java, this is the exception and garbage i receive:
java.sql.SQLException: ORA-06550: line 1, column 22:
PLS-00103: Encountered the symbol "" when expecting one of the following:
:= . ( @ % ;
The symbol "(" was substituted for "" to continue.
ORA-06550: line 1, column 33:
PLS-00103: Encountered the symbol ";" when expecting one of the following:
. ( ) , * @ % & | = - + < / > at in mod not range rem => ..
<an exponent (**)> <> or != or ~= >= <= <> and or like
between is null is not || indicator is
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114)
my stored procedure is as follows:
CREATE OR REPLACE PROCEDURE getUserByLogin (
arg_subscriptionName IN varchar,
arg_loginName IN varchar,
arg_password IN varchar,
arg_rec_userinfo_valLanguage OUT types.rec_userinfo_valLanguage
) AS
var_userNum int;
BEGIN
select
u.userNum into var_userNum
from
userInfo u,
subscription s
where
s.subscriptionName = arg_subscriptionName AND
s.subscriptionNum = u.subscriptionNum AND
u.loginName = arg_loginName AND
u.password = arg_password;
if (var_userNum is null) then
var_userNum := 0;
end if;
getUser(var_userNum, arg_rec_userinfo_valLanguage);
END;
/

I'm using a callable statement.
The strange thing is that, when i remove all IN and OUT paramters in the java code and the stored procedure, both the call to the stored procedure and teh execution of the stored procedure works.
The moment I add in just a IN parameter (in the stored procedure, and setting it in the java code) it stops working, and i receive this error.
java.sql.SQLException: ORA-06550: line 1, column 23:
PLS-00103: Encountered the symbol "" when expecting one of the following:
:= . ( @ % ;
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114)
heres the java code and stored procedure
CREATE OR REPLACE PROCEDURE sampleProcedure(tax out number)
is
BEGIN
tax := 10 *.15;
/END;
CallableStatement statement =conn.prepareCall("{call sampleprocedure ?}");
statement.registerOutParameter(1,java.sql.Types.INTEGER);
statement.execute();
ResultSet rs = statement.getResultSet();
if((rs = statement.getResultSet()) != null){

Passing data from Oracle stored procedures to Java

We're going to write a new web interface for a big system based on Oracle database. All business rules are already coded in PL/SQL stored procedures and we'd like to reuse as much code as possible. We'll write some new stored procedures that will combine the existing business rules and return the final result dataset.
We want to do this on the database level to avoid java-db round trips. The interface layer will be written in Java (we'd like to use GWT), so we need a way of passing data from Oracle stored procedures to Java service side. The data can be e.g. a set of properties of a specific item or a list of items fulfilling certain criteria. Would anyone recommend a preferable way of doing this?
We're considering one of the 2 following scenarios:
passing objects and lists of objects (DB object types defined on the schema level)
passing a sys_refcursor
We verified that both approaches are "doable", the question is more about design decision, best practice, possible maintenance problems, flexibility, etc.
I'd appreciate any hints.

user1754151 wrote:
We're going to write a new web interface for a big system based on Oracle database. All business rules are already coded in PL/SQL stored procedures and we'd like to reuse as much code as possible. We'll write some new stored procedures that will combine the existing business rules and return the final result dataset.
We want to do this on the database level to avoid java-db round trips. The interface layer will be written in Java (we'd like to use GWT), so we need a way of passing data from Oracle stored procedures to Java service side. The data can be e.g. a set of properties of a specific item or a list of items fulfilling certain criteria. Would anyone recommend a preferable way of doing this?
We're considering one of the 2 following scenarios:
passing objects and lists of objects (DB object types defined on the schema level)
passing a sys_refcursor
We verified that both approaches are "doable", the question is more about design decision, best practice, possible maintenance problems, flexibility, etc.
I'd appreciate any hints.If logic is already written in DB, and the only concern is of passing the result to java service side, and also from point of maintenance problem and flexibility i would suggest to use the sys_refcursor.
The reason if Down the line any thing changes then you only need to change the arguments of sys_refcursor in DB and as well as java side, and it is much easier and less efforts compare to using and changes required for Types and Objects on DB and java side.
The design and best practise keeps changing based on our requirement and exisiting design. But by looking at your current senario and design, i personally suggest to go with sys_refcursor.

Passing Arrays of User Defined Types to Oracle Stored Procedures

Hi
I am using WebLogic 8.14 & Oracle 9i with thin JDBC driver.
Our application needs to perform the same DB operation for every item in a Java Collection. I cannot acheive the required performance using the standard Prepare & Execute loop and so I am looking to push the whole collection to Oracle in a single invocation of a Stored Procedure and then loop on the database.
Summary of Approach:
In the Oracle database, we have defined a Object Type :
CREATE OR REPLACE
TYPE MYTYPE AS OBJECT
TxnId VARCHAR2(40),
Target VARCHAR2(20),
Source VARCHAR2(20),
Param1 VARCHAR2(2048),
Param2 VARCHAR2(2048),
Param3 VARCHAR2(2048),
Param4 VARCHAR2(2048),
Param5 VARCHAR2(2048),
and we have defined a collection of these as:
CREATE OR REPLACE
TYPE MYTYPE_COLLECTION AS VARRAY (100) OF MYTYPE
There is a stored procedure which takes one of these collections as an input parameter and I need to invoke these from within my code.
I am having major problems when I attempt to get the ArrayDescriptor etc to allow me to create an Array to pass to the stored procedure. I think this is because the underlying Oracle connection is wrapped by WebLogic.
Has anyone managed to pass an array to an Oracle Stored procedure on a pooled DB connection?
Thanks
Andy

Andy Bowes wrote:
Hi
I am using WebLogic 8.14 & Oracle 9i with thin JDBC driver.
Our application needs to perform the same DB operation for every item in a Java Collection. I cannot acheive the required performance using the standard Prepare & Execute loop and so I am looking to push the whole collection to Oracle in a single invocation of a Stored Procedure and then loop on the database.
Summary of Approach:
In the Oracle database, we have defined a Object Type :
CREATE OR REPLACE
TYPE MYTYPE AS OBJECT
TxnId VARCHAR2(40),
Target VARCHAR2(20),
Source VARCHAR2(20),
Param1 VARCHAR2(2048),
Param2 VARCHAR2(2048),
Param3 VARCHAR2(2048),
Param4 VARCHAR2(2048),
Param5 VARCHAR2(2048),
and we have defined a collection of these as:
CREATE OR REPLACE
TYPE MYTYPE_COLLECTION AS VARRAY (100) OF MYTYPE
There is a stored procedure which takes one of these collections as an input parameter and I need to invoke these from within my code.
I am having major problems when I attempt to get the ArrayDescriptor etc to allow me to create an Array to pass to the stored procedure. I think this is because the underlying Oracle connection is wrapped by WebLogic.
Has anyone managed to pass an array to an Oracle Stored procedure on a pooled DB connection?
Thanks
AndyHi. Here's what I suggest: First please get the JDBC you want to work in a
small standalone program that uses the Oracle thin driver directly. Once
that works, show me the JDBC code, and I will see what translation if
any is needed to make it work with WLS. Will your code be running in
WebLogic, or in an external client talking to WebLogic?
Also, have you tried the executeBatch() methods to see if you can
get the performance you want via batches?
Joe

Calling Oracle Stored Procedure from BC4J JSP App

I am on an extremely tight deadline and am trying to get my JSP application to use an Oracle Stored Procedure. I need to take some input from the user and send these values as parameters. Has anyone worked with Stored Procedures in JDev3.1? Please reply with some sample code if possible.
Thanks.

Hi,
Someone posted a similar request the other day. Here is my response to them:
Basically, you need to create a custom method from your JSP's ViewObject, which calls the stored procedure. You can then call the ViewObject's custom method from the JSP client.
Here is how I have done it:
1. Choose the ViewObject that your JSP is based on and choose 'Edit' from the context menu.
2. On the Java tab of the ViewObject wizard, choose Generate Java File checkbox for the View Object Class and click the Finish button. A file is created under the ViewObject node in the Navigator named 'viewobjectImpl.java'.
3. Open the viewobjectImpl.java file in the code editor and create a method to call your stored procedure (see sample code below).
4. Compile the VOImpl.java file.
5. Choose the view object again, and choose Edit again from the context menu.
6. On the Client Methods tab, you should now see your method appear in the Available field. Select it and shuttle it to the Selected field.
7. Click Finish to leave the VO wizard, and rebuild your Business Components project.
8. In your JSP, call the custom method (see sample code below).
sample code for custom method calling a stored procedure from VOImpl.java file:
public int getTotalHits(String mon, String year) {
CallableStatement stmt = null;
int total;
// the call to the PL/SQL stored proc
String totalhits = "{? = call walkthru.total_hits(?,?)}";
// use the AM conxn 2 call storedproc
stmt = getDBTransaction().createCallableStatement(totalhits, 1);
try
// Bind the Statement Parameters and //Execute this Statement
stmt.registerOutParameter(1,Types.INTEGER);
stmt.setString(2,mon); stmt.setString(3,year);
stmt.execute();
total = stmt.getInt(1);
catch (Exception ex)
throw new oracle.jbo.JboException(ex);
finally
try
stmt.close();
catch (Exception nex)
return total;
sample render code for calling custom method from JSP custom bean:
public void render() {
int totalhits;
try
Row[] rows;
// Retrieve all records by default, the qView variable is defined in the base class
qView.setRangeSize(-1);
qView.first();
rows = qView.getAllRowsInRange();
// instantiate a view object for our exported method
// and call the stored procedure to get the total
ViewObject vo = qView.getViewObject();
wtQueryView theView = (wtQueryView) vo;
totalhits = theView.getTotalHits(session.getValue("m").toString(),session.getValue("y").toString());
out.println(totalhits);
} catch(Exception ex)
throw new RuntimeException(ex.getMessage());
}

ADO memory leak when getting Recordset from an Oracle stored procedure?

I am programming in C++ (VC 6) and using ADO 2.7 to
access Oracle 9i database. My connection string looks
like this:
Provider=MSDAORA.1;Persist Security Info=True;User ID=scott;Password=tiger;Data Source=blahblah
I have Oracle stored procedure that returns data in a
REF CURSOR output parameter. Since the stored procedure
takes input parameters, I prepare a Command object with
Parameters initialized and attached to it. I use the
Recordset Open method to execute the call. This approach
works because I get correct data back from the call in
the Recordset, but the problem is when I do this in a
infinite loop and watch the process in Windows Taks
Manager, I see 4k or 8k memory delta all the time and
the Peak Memory Usage of the process keeping going up.
I hope someone knows something in this scenario and points
me to the right direction.
Thanks, please see the following code for specifics.
HRESULT CallSP3Params(VARIANT vp1, VARIANT vp2, int spretcode, LPDISPATCH ppRSet, char *pCmdLine)
     _RecordsetPtr     pRs;
     _CommandPtr     pCmd;
     _ParameterPtr     paramVProfiler[3];
     bstrt          strMissing(L"");
     *ppRSet = NULL;
     variantt          ErrConn;
     ErrConn.vt = VT_ERROR;
     ErrConn.scode = DISP_E_PARAMNOTFOUND;
     try {
     //Create instance of command object
     pCmd.CreateInstance(__uuidof(Command));
     pRs.CreateInstance(__uuidof(Recordset));
          if ( vp1.vt == VT_BSTR ) {
               paramVProfiler[0] = pCmd->CreateParameter("P1",adVarChar,adParamInput,SysStringLen(vp1.bstrVal) + 10,strMissing );
               paramVProfiler[0]->Value = vp1;
          else if ( vp1.vt == VT_I4 )
               paramVProfiler[0] = pCmd->CreateParameter("P1",adNumeric,adParamInput,15,vp1);
          else
               TESTHR( PARAMETER_OPERATION_ERROR );
          pCmd->Parameters->Append(paramVProfiler[0]);
          if ( vp2.vt == VT_BSTR ) {
               paramVProfiler[1] = pCmd->CreateParameter("P2",adVarChar,adParamInput,SysStringLen(vp2.bstrVal) + 10,strMissing );
               paramVProfiler[1]->Value = vp2;
          else if ( vp2.vt == VT_I4 )
               paramVProfiler[1] = pCmd->CreateParameter("P2",adNumeric,adParamInput,15,vp2);
          else
               TESTHR( PARAMETER_OPERATION_ERROR );
          pCmd->Parameters->Append(paramVProfiler[1]);
          paramVProfiler[2] = pCmd->CreateParameter("RETCODE",adNumeric,adParamOutput,10);
          pCmd->Parameters->Append(paramVProfiler[2]);
     //Catch COM errors
     catch( comerror &e) {
     try {
     // I manage my connection through this little C++ class of my own
     CCUsage myconnection( &Connectionkeeper[0] );
     //Set the active connection property of command object to open connection
     pCmd->ActiveConnection = myconnection.m_conn;
     //The command type is text
     pCmd->CommandType = adCmdText;
     //Set command text to call the stored procedure
     pCmd->CommandText = pCmdLine;
     //Open the Recordset to get result
     pRs->Open( variantt((IDispatch *)pCmd,true), ErrConn, adOpenStatic, adLockReadOnly, adOptionUnspecified );
     //Disconnect the command object
     pCmd->PutRefActiveConnection( NULL );
     if ( GetSPRetCode( pCmd, "RETCODE", spretcode ) != S_OK )
          TESTHR(DB_OBJECT_OPERATION_ERROR);
     // pRs->QueryInterface(IID_IDispatch, (void**) ppRSet);
     // I return the Recordset by calling QueryInterface, but even without that, closing the Recordset right here still shows memory leak.
     pRs->Close( );
     pRs = NULL;
     //Catch COM errors
catch (_com_error e) {
     return S_OK;
}

Whenever large numbers of BSTRs are allocated and freed quickly the process memory will continue to climb towards a stabalizing value. BSTRs are not freed until the system frees them. You can see this by making many calls allocating and freeing BSTRs, memory will climb, but when you stop for a while the gargage collection of the sys strings will take place. I've done much research to see that a server doing many queries very rapidly is not leaking memory, but out pacing the garbage collection, it will stabilize and when the process has some "rest time" the processes memory usage will decline.
In my research a suspected memory leak was not one.

Java Class - Oracle Stored Procedure - ABAP Program

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