OCIBindArrayOfStruct not called, but array insert successed

Question

according to Oracle document, the OCIBindArrayOfStruct must be called for array insert, but I observed a stranger behavior that I bind the address of array through OCIBindByPos and didn't call OCIBindArrayOfStruct, and the call OCIStmtExecute, give iters the number of element of array. all data in array are insert succeeded, so I am wonder what will happen if OCIBindArrayOfStruct is not called? and why even the function is not called, array insert still succeeded? It seems OCI's behavior is same as OCIBindArrayOfStruct if iters great than 1.@
#include "stdafx.h"
#include "oci.h"
void PrintError(OCIError *pError);
int _tmain(int argc, _TCHAR* argv[])
  char szName[20] = {0};
  char szUID[20] = {0};
  char szPWD[20] = {0};
  OCIEnv *pEnv = NULL;
  OCIError *pErr = NULL;
  OCIServer *pServer = NULL;
  OCISvcCtx *pSvcCtx = NULL;
  OCISession *pSession = NULL;
  OCIInitialize((ub4)OCI_THREADED | OCI_OBJECT, 0, 0, 0, NULL);
  ::OCIEnvInit(&pEnv, OCI_DEFAULT, 0, NULL);
  sword wStatus = ::OCIHandleAlloc(pEnv, (void**)&pErr, OCI_HTYPE_ERROR, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Failed allocate Error handle";
  return 0;
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pServer, OCI_HTYPE_SERVER, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Failed allocate Server handle.";
  return 0;
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pSvcCtx, OCI_HTYPE_SVCCTX, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Failed allocate service context handle.";
  return 0;
  std::cout << "Please enter the TNS name:";
  std::cin >> szName;
  std::cout << "Please enter user name:";
  std::cin >> szUID;
  std::cout << "Please enter password:";
  std::cin >> szPWD;
  wStatus = ::OCIServerAttach(pServer, pErr, (OraText*)szName, strlen(szName), OCI_DEFAULT);
  if (wStatus == OCI_ERROR)
  std::cout << "Unable to attach to a server.";
  return 0;
  OCIAttrSet(pSvcCtx, OCI_HTYPE_SVCCTX, pServer, 0, OCI_ATTR_SERVER, pErr);
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pSession, OCI_HTYPE_SESSION, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Unable to allocate a session handle.";
  return 0;
  OCIAttrSet(pSession, OCI_HTYPE_SESSION, (void*)szUID, strlen(szUID), OCI_ATTR_USERNAME, pErr);
  OCIAttrSet(pSession, OCI_HTYPE_SESSION, (void*)szPWD, strlen(szPWD), OCI_ATTR_PASSWORD, pErr);
  wStatus = OCISessionBegin(pSvcCtx, pErr, pSession, OCI_CRED_RDBMS, OCI_DEFAULT);
  if (wStatus == OCI_ERROR)
  std::cout << "Unable to begin a session.";
  return 0;
  OCIAttrSet(pSvcCtx, OCI_HTYPE_SVCCTX, pSession, 0, OCI_ATTR_SESSION, pErr);
  std::cout << "Connected.";
  OCIStmt *pStmt;
  OCIBind *pBind;
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pStmt, OCI_HTYPE_STMT, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "failed allocate statement handle." << std::endl;
  return 0;
  OraText *lpSQL = (OraText*) "Insert into test (prop, value) values(:p, :v)";
  wStatus = ::OCIStmtPrepare(pStmt, pErr, lpSQL, strlen((char*)lpSQL), OCI_NTV_SYNTAX, OCI_DEFAULT);
  if (wStatus != OCI_SUCCESS)
  PrintError(pErr);
  int nProp[5] = {1, 2, 3, 4, 5};
  char szValue[5][20];
  strcpy_s(szValue[0], _countof(szValue), "V1");
  strcpy_s(szValue[1], _countof(szValue), "V2");
  strcpy_s(szValue[2], _countof(szValue), "V3");
  strcpy_s(szValue[3], _countof(szValue), "V4");
  strcpy_s(szValue[4], _countof(szValue), "V5");
  wStatus = ::OCIBindByName(pStmt, &pBind, pErr, (OraText*)":p", 2, nProp, sizeof(int), SQLT_INT, NULL, NULL, NULL, NULL, NULL, OCI_DEFAULT);
  wStatus = ::OCIBindByName(pStmt, &pBind, pErr, (OraText*)":v", 2, szValue, sizeof(szValue[0]), SQLT_STR, NULL, NULL, NULL, NULL, NULL, OCI_DEFAULT);
  wStatus = ::OCIStmtExecute(pSvcCtx, pStmt, pErr, 5, 0, NULL, NULL, OCI_COMMIT_ON_SUCCESS);
  if (wStatus != OCI_SUCCESS)
  PrintError(pErr);
  ::OCISessionEnd(pSvcCtx, pErr, pSession, OCI_DEFAULT);
  ::OCIServerDetach(pServer, pErr, OCI_DEFAULT);
  return 0;
void PrintError(OCIError *pError)
  UCHAR szMessage[1024];
  memset(szMessage,0,1024);
  sb4 ErrorCode;
    (void) OCIErrorGet((dvoid *)pError, (ub4) 1, (text *) NULL, &ErrorCode, szMessage, (ub4) sizeof(szMessage), OCI_HTYPE_ERROR);
  std::cout << "Error:" << szMessage << std::endl;

Answer 1

according to Oracle document, the OCIBindArrayOfStruct must be called for array insert, but I observed a stranger behavior that I bind the address of array through OCIBindByPos and didn't call OCIBindArrayOfStruct, and the call OCIStmtExecute, give iters the number of element of array. all data in array are insert succeeded, so I am wonder what will happen if OCIBindArrayOfStruct is not called? and why even the function is not called, array insert still succeeded? It seems OCI's behavior is same as OCIBindArrayOfStruct if iters great than 1.@
#include "stdafx.h"
#include "oci.h"
void PrintError(OCIError *pError);
int _tmain(int argc, _TCHAR* argv[])
  char szName[20] = {0};
  char szUID[20] = {0};
  char szPWD[20] = {0};
  OCIEnv *pEnv = NULL;
  OCIError *pErr = NULL;
  OCIServer *pServer = NULL;
  OCISvcCtx *pSvcCtx = NULL;
  OCISession *pSession = NULL;
  OCIInitialize((ub4)OCI_THREADED | OCI_OBJECT, 0, 0, 0, NULL);
  ::OCIEnvInit(&pEnv, OCI_DEFAULT, 0, NULL);
  sword wStatus = ::OCIHandleAlloc(pEnv, (void**)&pErr, OCI_HTYPE_ERROR, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Failed allocate Error handle";
  return 0;
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pServer, OCI_HTYPE_SERVER, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Failed allocate Server handle.";
  return 0;
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pSvcCtx, OCI_HTYPE_SVCCTX, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Failed allocate service context handle.";
  return 0;
  std::cout << "Please enter the TNS name:";
  std::cin >> szName;
  std::cout << "Please enter user name:";
  std::cin >> szUID;
  std::cout << "Please enter password:";
  std::cin >> szPWD;
  wStatus = ::OCIServerAttach(pServer, pErr, (OraText*)szName, strlen(szName), OCI_DEFAULT);
  if (wStatus == OCI_ERROR)
  std::cout << "Unable to attach to a server.";
  return 0;
  OCIAttrSet(pSvcCtx, OCI_HTYPE_SVCCTX, pServer, 0, OCI_ATTR_SERVER, pErr);
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pSession, OCI_HTYPE_SESSION, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "Unable to allocate a session handle.";
  return 0;
  OCIAttrSet(pSession, OCI_HTYPE_SESSION, (void*)szUID, strlen(szUID), OCI_ATTR_USERNAME, pErr);
  OCIAttrSet(pSession, OCI_HTYPE_SESSION, (void*)szPWD, strlen(szPWD), OCI_ATTR_PASSWORD, pErr);
  wStatus = OCISessionBegin(pSvcCtx, pErr, pSession, OCI_CRED_RDBMS, OCI_DEFAULT);
  if (wStatus == OCI_ERROR)
  std::cout << "Unable to begin a session.";
  return 0;
  OCIAttrSet(pSvcCtx, OCI_HTYPE_SVCCTX, pSession, 0, OCI_ATTR_SESSION, pErr);
  std::cout << "Connected.";
  OCIStmt *pStmt;
  OCIBind *pBind;
  wStatus = ::OCIHandleAlloc(pEnv, (void**)&pStmt, OCI_HTYPE_STMT, 0, NULL);
  if (wStatus == OCI_ERROR)
  std::cout << "failed allocate statement handle." << std::endl;
  return 0;
  OraText *lpSQL = (OraText*) "Insert into test (prop, value) values(:p, :v)";
  wStatus = ::OCIStmtPrepare(pStmt, pErr, lpSQL, strlen((char*)lpSQL), OCI_NTV_SYNTAX, OCI_DEFAULT);
  if (wStatus != OCI_SUCCESS)
  PrintError(pErr);
  int nProp[5] = {1, 2, 3, 4, 5};
  char szValue[5][20];
  strcpy_s(szValue[0], _countof(szValue), "V1");
  strcpy_s(szValue[1], _countof(szValue), "V2");
  strcpy_s(szValue[2], _countof(szValue), "V3");
  strcpy_s(szValue[3], _countof(szValue), "V4");
  strcpy_s(szValue[4], _countof(szValue), "V5");
  wStatus = ::OCIBindByName(pStmt, &pBind, pErr, (OraText*)":p", 2, nProp, sizeof(int), SQLT_INT, NULL, NULL, NULL, NULL, NULL, OCI_DEFAULT);
  wStatus = ::OCIBindByName(pStmt, &pBind, pErr, (OraText*)":v", 2, szValue, sizeof(szValue[0]), SQLT_STR, NULL, NULL, NULL, NULL, NULL, OCI_DEFAULT);
  wStatus = ::OCIStmtExecute(pSvcCtx, pStmt, pErr, 5, 0, NULL, NULL, OCI_COMMIT_ON_SUCCESS);
  if (wStatus != OCI_SUCCESS)
  PrintError(pErr);
  ::OCISessionEnd(pSvcCtx, pErr, pSession, OCI_DEFAULT);
  ::OCIServerDetach(pServer, pErr, OCI_DEFAULT);
  return 0;
void PrintError(OCIError *pError)
  UCHAR szMessage[1024];
  memset(szMessage,0,1024);
  sb4 ErrorCode;
    (void) OCIErrorGet((dvoid *)pError, (ub4) 1, (text *) NULL, &ErrorCode, szMessage, (ub4) sizeof(szMessage), OCI_HTYPE_ERROR);
  std::cout << "Error:" << szMessage << std::endl;