Defining the name of the module in the program of the OIC

Hello

I was struggling with defining the name of the module in my OIC program. Here's the code in which
I create the environment, connect, try to set the module attribute, wait for the Enter key and clean
and exit after completing the Enter key.

I can say, I called OCISetAttr as the documentation says I should, and none of my return values
indicate a problem. Yet, when I v $session, I get what I assume is the default value of the module
and no value, I put in the code ("moduletest").

The physical file name programs is oci101.exe. It also connects to the Oracle instance as a named user
oci101. I check v$ session with this query:
Select the user name, the module from v$ session where the username is not null;

And the output is as follows:

USER MODULE NAME
------------------------------ ------------------------------------------------
OCI101 oci101.exe
SQL SYSTEM * more

I see a column value 'moduletest' for the OCI101 user MODULE.

Don't know what I'm missing. Any ideas? Here is the code:

Code BÉGIN:

OCIEnv * envhp;
UB2 charset_id = 0;
UB2 ncharset_id = 0;
UB4 mode = OCI_DEFAULT;

sword env_rc = OCIEnvNlsCreate () const
& envhp, mode,
(void *) 0, / / context for the allocation of memory to custom user defined
(void *) (*) (void *, size_t) 0, / / malloc user defined
(void * (*) (void *, void *, size_t)) 0, / / realloc user defined
(void (*) (void *, void *)) 0, / / / / free user defined
(size_t) 0, / / off user memory
(void *) 0,.
charset_id, ncharset_id
);

OCIError * errhp;
sword err_rc = OCIHandleAlloc () const
(dvoid *) envhp, (dvoid *) & errhp,.
OCI_HTYPE_ERROR (size_t) 0, (dvoid *) 0
);
checkerr (err_rc, errhp);

OCISvcCtx * svchp = 0;
sword l2rc = OCILogon2 () const
envhp, errhp, & svchp,
(const OraText *) zusername, (ub4) strlen (zusername).
(const OraText *) zpassword, (ub4) strlen (zpassword).
(const OraText *) zdatabase, (ub4) strlen (zdatabase).
mode
);
checkerr (l2rc, errhp);

Define the attrbute module
Extract the session descriptor in sessionhp.

OCISession * sessionhp = 0;
UB4 sh_size = 0;
sword oci_attr_get_status = OCIAttrGet (svchp,
OCI_HTYPE_SVCCTX,
& sessionhp,
& sh_size,
OCI_ATTR_SESSION,
errhp);
checkerr (oci_attr_get_status, errhp);

Configure the module
sword oas_rc = OCIAttrSet (sessionhp, OCI_HTYPE_SESSION,(void *) 'moduletest',
strlen ("moduletest"), OCI_ATTR_MODULE, errhp);

checkerr (oas_rc, errhp);

GetChar ();
Cleaning:
If (svchp) {/ / 0 when already disconnected}
OCISvcCtx * const tmp_svchp = svchp.
svchp = 0; reset the svchp error or not
const sword lorc = OCILogoff (tmp_svchp, errhp);
checkerr (lorc, errhp);
}

sword const rc = OCIHandleFree (envhp, OCI_HTYPE_ENV);
End of the Code.

Thanks for any help...

Karl

Hi Karl,

I'm certainly not an expert of BEAK, but after you set the module attribute, the value is updated when the next execution of the statement in my experience. There may be other ways in which this can happen, but I have not seen such cases.

Here is a short example:

#include 
#include 
#include 
#include 

int main(int argc, char *argv[]) {
  OCIEnv      *envhp = NULL;  /* OCI Environment handle     */
  OCIError    *errhp = NULL;  /* OCI Error handle           */
  OCISvcCtx   *svchp = NULL;  /* OCI Service Context handle */
  OCISession  *usrhp = NULL;  /* OCI User Session handle    */

  OCIStmt     *stmtp = NULL;  /* OCI Statement handle       */

  /* the statement to execute   */
  /* this is purely for example */
  oratext *sqlstmt = "begin null; end;";

  /* connection information */
  oratext *username = "scott";
  oratext *password = "tiger";
  oratext *database = "orademo";

  /* used to hold the results of each OCI call */
  sword result = 0;

  /* Initialize and create a default environment */
  result = OCIEnvCreate(&envhp,
                        OCI_DEFAULT,
                        (dvoid *) 0,
                        0,
                        0,
                        0,
                        (size_t) 0,
                        (dvoid **) 0);

  /* allocate an error handle */
  result = OCIHandleAlloc((dvoid *) envhp,
                          (dvoid **) &errhp,
                          OCI_HTYPE_ERROR,
                          0,
                          (dvoid **) 0);

  /* create connection */
  result = OCILogon2(envhp,
                     errhp,
                     &svchp,
                     username,
                     (ub4) strlen(username),
                     password,
                     (ub4) strlen(password),
                     database,
                     (ub4) strlen(database),
                     OCI_DEFAULT);

  /* get the user session handle */
  result = OCIAttrGet(svchp,
                      OCI_HTYPE_SVCCTX,
                      (void *) &usrhp,
                      NULL,
                      OCI_ATTR_SESSION,
                      errhp);

  /* set the module attribute */
  result = OCIAttrSet(usrhp,
                      OCI_HTYPE_SESSION,
                      (void *) "My Module",
                      (ub4) strlen("My Module"),
                      OCI_ATTR_MODULE,
                      errhp);

  /* allocate the statement handle */
  result = OCIHandleAlloc((dvoid *) envhp,
                          (dvoid **) &stmtp,
                          OCI_HTYPE_STMT,
                          0,
                          (dvoid **) 0);

  /* prepare the statement for execution */
  result = OCIStmtPrepare(stmtp,
                          errhp,
                          sqlstmt,
                          (ub4) strlen((char *) sqlstmt),
                          OCI_NTV_SYNTAX,
                          OCI_DEFAULT);

  /* execute the statement - after execution the */
  /* MODULE value should be updated in v$session */
  result = OCIStmtExecute(svchp,
                          stmtp,
                          errhp,
                          (ub4) 1,
                          (ub4) 0,
                          (CONST OCISnapshot *) NULL,
                          (OCISnapshot *) NULL,
                          OCI_DEFAULT);

  /* print a simple prompt    */
  /* view session in SQL*Plus */
  printf("program paused, ENTER to continue...");
  getchar();

  /* disconnect from the server */
  result = OCILogoff(svchp,
                     errhp);

  /* deallocate the environment handle */
  /* OCI will deallocate child handles */
  result = OCIHandleFree((void *) envhp,
                         OCI_HTYPE_ENV);

  return OCI_SUCCESS;
}

When the program is paused I see this in SQL * more in my test:

SQL> select sid, username, program, module from v$session where username = 'SCOTT';

       SID USERNAME         PROGRAM                          MODULE
---------- ---------------- -------------------------------- --------------------------------
       136 SCOTT            OCIModuleTest.exe                My Module

Maybe it's a little help.

Kind regards

Mark

Published by: Mark Williams on December 22, 2008 11:06

Put a little sample.

Tags: Database

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