Utilizzare parametri con valori di tabella (OLE DB)
Si applica a: 
SQL Server Database SQL di Azure Istanza gestita di SQL di Azure Azure Synapse Analytics Piattaforma di strumenti analitici (PDW)
Questo esempio funziona con SQL Server 2008 (10.0.x) e versioni successive. Questo esempio consente di eseguire le seguenti operazioni:
Crea parametri con valori di tabella usando l'individuazione dinamica tramite IOpenRowset::OpenRowset.
Invio di righe di parametri con valori di tabella utilizzando il modello pull nella classe EmployeesRowset. Nel modello pull il consumer fornisce dati su richiesta al provider.
Invio di oggetti BLOB come parte di un parametro con valori di tabella nella classe CPhotograph.
Utilizzo di proprietà dei parametri personalizzate tramite ISSCommandWithParameters.
Visualizzazione della gestione degli errori per gli errori MSOLEDBSQL.
Per altre informazioni sui parametri con valori di tabella, vedere Parametri con valori di tabella (OLE DB Driver per SQL Server).
Esempio
Il primo elenco codici (Transact-SQL) consente di creare il database usato dall'esempio.
Inserire il secondo listato di codice in un file denominato stdafx.h.
Inserire il terzo listato di codice in un file denominato OLEDBUtils.hpp.
Compilare il quarto listato di codice (C++) con ole32.lib oleaut32.lib ed eseguirlo. In questa applicazione viene eseguita la connessione all'istanza predefinita di SQL Server nel computer in uso. In alcuni sistemi operativi Windows sarà necessario modificare (local) o (localhost) impostando il valore sul nome dell'istanza di SQL Server. Per connettersi a un'istanza denominata, modificare la stringa di connessione da L"(local)" a L"(local)\\nome", dove nome è l'istanza denominata. Per impostazione predefinita, SQL Server Express viene installato in un'istanza denominata. Verificare che nella variabile di ambiente INCLUDE sia presente la directory che contiene msoledbsql.h.
Il quinto elenco codici (Transact-SQL) consente di creare il database usato dall'esempio.
create database testdb
go
use testdb
go
create table tblEmployees (
id int identity primary key,
name nvarchar(50) not null,
birthday date null,
salary int null,
photograph varbinary(max) null
)
go
create type tvpEmployees as table(
name nvarchar(50) not null,
birthday date null,
salary int null,
photograph varbinary(max) null
)
go
create procedure insertEmployees @tvpEmployees tvpEmployees readonly,
@id int output as
insert tblEmployees(name, birthday, salary, photograph)
select name, birthday, salary, photograph from @tvpEmployees
select @id = coalesce(scope_identity(), -1)
go
// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently, but
// are changed infrequently
//
#pragma once
// The following macros define the minimum required platform. The minimum required platform
// is the earliest version of Windows, Internet Explorer etc. that has the necessary features to run
// your application. The macros work by enabling all features available on platform versions up to and
// including the version specified.
// Modify the following defines if you have to target a platform prior to the ones specified below.
// Refer to MSDN for the latest info on corresponding values for different platforms.
#ifndef _WIN32_WINNT // Specifies that the minimum required platform is Windows Vista.
#define _WIN32_WINNT 0x0600 // Change this to the appropriate value to target other versions of Windows.
#endif
#include <stdio.h>
#include <tchar.h>
#include <stdlib.h>
#include <stddef.h>
#include <assert.h>
#include <windows.h>
#include <strsafe.h>
// #defines necessary for initializing the CLSID & IIDs of OLEDB specific interfaces
#define DBINITCONSTANTS
#define INITGUID
#include <oledberr.h>
#include <msoledbsql.h>
// OLEDBUtils.hpp
#pragma once
// Utility Macros & Functions
#define CHKHR_GOTO(hr, Label) \
{ if (FAILED(hr)) { wprintf(L"Error in file %S at line %d.\n", __FILE__, __LINE__); goto Label;} };
#define CHKHR_GOTO_MSG(hr, Label, wszMessage) \
{ if (FAILED(hr)) { wprintf(L"Error in file %S at line %d.\nError Message: %s\n", __FILE__, __LINE__, wszMessage); goto Label;} };
#define CHKHR_OLEDB_GOTO(hr, Label, pItf, IID_Itf) \
{ if (FAILED(hr)) { wprintf(L"Error in file %S at line %d.\n", __FILE__, __LINE__); DumpErrorInfo(pItf, IID_Itf); goto Label;} };
#define NUMELEM(arr) (sizeof(arr) / sizeof(arr[0]))
// Template function that checks the NULL-ness of a COM interface and if it is non-NULL releases it & also sets it to NULL
template<class T>
void Release(T** pUnkCOMItf) {
if (*pUnkCOMItf) {
(*pUnkCOMItf)->Release();
*pUnkCOMItf = NULL;
}
}
// Utility routine for displaying OLEDB errors
void DumpErrorInfo (
IUnknown* pObjectWithError,
REFIID IID_InterfaceWithError
);
// COM Load/Unload Helper
class CCOMLoader {
public:
HRESULT Load() {
return CoInitializeEx(NULL, COINIT_MULTITHREADED);
}
~CCOMLoader() {
CoUninitialize();
}
};
// Represents an OLEDB data source, used for connection & session creation
class CMSOLEDBSQLDataSource {
private:
bool m_fIsConnected;
IDBInitialize* m_pIDBInitialize; // Data Source Initialization interface
public:
CMSOLEDBSQLDataSource() : m_pIDBInitialize(NULL), m_fIsConnected(false) {}
HRESULT Connect(const wchar_t* wszDataSource, const wchar_t* wszCatalog) {
HRESULT hr = S_OK;
IDBProperties* pIDBProperties = NULL;
const ULONG INIT_PROPS = 3;
DBPROP rgInitProps[INIT_PROPS] = {0};
const ULONG INIT_PROPSETS = 1;
DBPROPSET rgInitPropSets[INIT_PROPSETS] = {0};
//Obtain access to the MSOLEDBSQL provider.
hr = CoCreateInstance(CLSID_MSOLEDBSQL, NULL, CLSCTX_INPROC_SERVER, IID_IDBInitialize, reinterpret_cast<void **>(&m_pIDBInitialize));
CHKHR_GOTO_MSG(hr, _Exit, L"Unable to load MSOLEDBSQL");
// Set initialization property values
SetPropertyBSTR(DBPROP_INIT_DATASOURCE, wszDataSource, &rgInitProps[0]);
SetPropertyBSTR(DBPROP_INIT_CATALOG, wszCatalog, &rgInitProps[1]);
SetPropertyBSTR(DBPROP_AUTH_INTEGRATED, L"SSPI", &rgInitProps[2]);
// Setup the initialization property sets
InitializePropSet(
rgInitPropSets,
NUMELEM(rgInitProps),
DBPROPSET_DBINIT,
rgInitProps);
hr = m_pIDBInitialize->QueryInterface(IID_IDBProperties, reinterpret_cast<void**>(&pIDBProperties));
CHKHR_GOTO_MSG(hr, _Exit, L"Failure to QI IDBInitialize.");
hr = pIDBProperties->SetProperties(NUMELEM(rgInitPropSets), rgInitPropSets);
CHKHR_OLEDB_GOTO(hr, _Exit, pIDBProperties, IID_IDBProperties);
hr = m_pIDBInitialize->Initialize();
CHKHR_OLEDB_GOTO(hr, _Exit, m_pIDBInitialize, IID_IDBInitialize);
m_fIsConnected = true;
_Exit:
Release(&pIDBProperties);
CleanPropSet(rgInitPropSets);
return hr;
}
HRESULT GetSession(IOpenRowset** ppIOpenRowset) {
assert(m_pIDBInitialize);
assert(m_fIsConnected);
HRESULT hr = S_OK;
IDBCreateSession* pIDBCreateSession = NULL;
if (m_pIDBInitialize)
hr = m_pIDBInitialize->QueryInterface(IID_IDBCreateSession, reinterpret_cast<void**>(&pIDBCreateSession));
CHKHR_GOTO_MSG(hr, _Exit, L"Failure to QI IDBCreateSession.");
if (pIDBCreateSession)
hr = pIDBCreateSession->CreateSession(NULL, IID_IOpenRowset, reinterpret_cast<IUnknown**>(ppIOpenRowset));
CHKHR_OLEDB_GOTO(hr, _Exit, pIDBCreateSession, IID_IDBCreateSession);
_Exit:
Release(&pIDBCreateSession);
return hr;
}
~CMSOLEDBSQLDataSource() {
if (m_fIsConnected) {
assert(m_pIDBInitialize);
HRESULT hr = S_OK;
if (m_pIDBInitialize)
hr = m_pIDBInitialize->Uninitialize();
CHKHR_OLEDB_GOTO(hr, _Exit, m_pIDBInitialize, IID_IDBInitialize);
}
_Exit:
Release(&m_pIDBInitialize);
}
private:
void InitializePropSet( DBPROPSET* pPropSet, ULONG cProps, GUID guidPropSet, DBPROP* pProps ) {
pPropSet->cProperties = cProps;
pPropSet->guidPropertySet = guidPropSet;
pPropSet->rgProperties = pProps;
}
void CleanPropSet (DBPROPSET* pPropSet) {
for (ULONG idxProp = 0; idxProp < pPropSet->cProperties; idxProp++)
if (pPropSet->rgProperties[idxProp].vValue.vt == VT_BSTR)
SysFreeString(pPropSet->rgProperties[idxProp].vValue.bstrVal);
}
void SetPropertyBSTR (DBPROPID propID, const wchar_t* wszValue, DBPROP* pProperty) {
pProperty->dwPropertyID = propID;
pProperty->dwOptions = DBPROPOPTIONS_REQUIRED;
pProperty->colid = DB_NULLID;
pProperty->vValue.vt = VT_BSTR;
pProperty->vValue.bstrVal = SysAllocStringLen(wszValue, (UINT)wcslen(wszValue));
}
void SetPropertyBool( DBPROP* pProperty, DBPROPID dwPropID, VARIANT_BOOL boolValue) {
pProperty->dwPropertyID = dwPropID;
pProperty->dwOptions = DBPROPOPTIONS_REQUIRED;
pProperty->colid = DB_NULLID;
pProperty->vValue.vt = VT_BOOL;
pProperty->vValue.boolVal = boolValue;
}
void SetPropertyI8 ( DBPROP* pProperty, DBPROPID dwPropID, LONGLONG i8Value ) {
pProperty->dwPropertyID = dwPropID;
pProperty->dwOptions = DBPROPOPTIONS_REQUIRED;
pProperty->colid = DB_NULLID;
pProperty->vValue.vt = VT_I8;
pProperty->vValue.llVal = i8Value;
}
};
class CPhotograph : public ISequentialStream {
private:
DBREFCOUNT m_cRef;
BYTE* m_pbStream;
size_t m_cbStreamLength;
size_t m_idxStreamOffset;
public:
CPhotograph(size_t cbStreamLength) : m_cbStreamLength(cbStreamLength), m_idxStreamOffset(0), m_cRef(1) {
m_pbStream = new BYTE[m_cbStreamLength];
// Generate random data for the photograph stream
for (size_t i = 0; i < m_cbStreamLength; i++)
m_pbStream[i] = static_cast<BYTE>(rand() % 256);
}
~CPhotograph() {
delete [] m_pbStream;
}
STDMETHODIMP QueryInterface(REFIID riid, LPVOID* ppv) {
if (ppv == NULL)
return E_INVALIDARG;
if (riid == IID_IUnknown || riid == IID_ISequentialStream)
*ppv = reinterpret_cast<void*>(this);
else
*ppv = NULL;
if (*ppv) {
(reinterpret_cast<IUnknown*>(*ppv))->AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
// @cmember Increments the Reference count
STDMETHODIMP_(DBREFCOUNT) AddRef() {
return InterlockedIncrement((long*)&m_cRef);
}
STDMETHODIMP_(DBREFCOUNT) Release() {
assert(m_cRef > 0);
ULONG cRef = InterlockedDecrement((long*) &m_cRef);
if (!cRef)
delete this;
return cRef;
}
STDMETHODIMP Read(void* pBuffer, ULONG cb, ULONG* pcb) {
if (pcb)
*pcb = 0;
if (m_idxStreamOffset == m_cbStreamLength)
return S_FALSE;
size_t cbRemainingBytes = m_cbStreamLength - m_idxStreamOffset;
if (pcb)
*pcb = min(cb, static_cast<ULONG>(cbRemainingBytes));
memcpy(pBuffer, m_pbStream + m_idxStreamOffset, min(cb, cbRemainingBytes));
return S_OK;
}
STDMETHODIMP Write(const void*, ULONG, ULONG* /*pcb*/ ) {
return E_NOTIMPL;
}
};
void DumpErrorInfo (IUnknown* pObjectWithError, REFIID IID_InterfaceWithError) {
// Interfaces used in the example.
IErrorInfo* pIErrorInfoAll = NULL;
IErrorInfo* pIErrorInfoRecord = NULL;
IErrorRecords* pIErrorRecords = NULL;
ISupportErrorInfo* pISupportErrorInfo = NULL;
ISQLErrorInfo* pISQLErrorInfo = NULL;
ISQLServerErrorInfo* pISQLServerErrorInfo = NULL;
// Number of error records.
ULONG nRecs;
ULONG nRec;
// Basic error information from GetBasicErrorInfo.
ERRORINFO errorinfo;
// IErrorInfo values.
BSTR bstrDescription;
BSTR bstrSource;
// ISQLErrorInfo parameters.
BSTR bstrSQLSTATE;
LONG lNativeError;
// ISQLServerErrorInfo parameter pointers.
SSERRORINFO* pSSErrorInfo = NULL;
OLECHAR* pSSErrorStrings = NULL;
// Obtain the default locale ID
DWORD MYLOCALEID = GetUserDefaultLCID();
// Only ask for error information if the interface supports it.
if (FAILED(pObjectWithError->QueryInterface(IID_ISupportErrorInfo, (void**) &pISupportErrorInfo)))
return;
if (FAILED(pISupportErrorInfo->InterfaceSupportsErrorInfo(IID_InterfaceWithError)))
return;
// Do not test the return of GetErrorInfo. It can succeed and return
// a NULL pointer in pIErrorInfoAll. Simply test the pointer.
if (GetErrorInfo(0, &pIErrorInfoAll) == S_FALSE) {
pISupportErrorInfo->Release();
pISupportErrorInfo = NULL;
return;
}
if (pIErrorInfoAll != NULL) {
// Test to see if it's a valid OLE DB IErrorInfo interface
// exposing a list of records.
if (SUCCEEDED(pIErrorInfoAll->QueryInterface(IID_IErrorRecords,(void**) &pIErrorRecords))) {
pIErrorRecords->GetRecordCount(&nRecs);
// Within each record, retrieve information from each
// of the defined interfaces.
for (nRec = nRecs - 1; (long)nRec >= 0; nRec--) {
// From IErrorRecords, get the HRESULT and a reference
// to the ISQLErrorInfo interface.
pIErrorRecords->GetBasicErrorInfo(nRec, &errorinfo);
pIErrorRecords->GetCustomErrorObject(nRec,IID_ISQLErrorInfo, (IUnknown**) &pISQLErrorInfo);
if (pISQLErrorInfo != NULL) {
pISQLErrorInfo->GetSQLInfo(&bstrSQLSTATE, &lNativeError);
if (bstrSQLSTATE[0] == '0' && bstrSQLSTATE[1] == '1') {}
else {
// Display the SQLSTATE and native error values.
wprintf(L"SQLSTATE:\t%s\nNative Error:\t%ld\n",
bstrSQLSTATE, lNativeError);
// SysFree BSTR references.
SysFreeString(bstrSQLSTATE);
}
// Get the ISQLServerErrorInfo interface from
// ISQLErrorInfo before releasing the reference.
pISQLErrorInfo->QueryInterface(IID_ISQLServerErrorInfo, (void**) &pISQLServerErrorInfo);
pISQLErrorInfo->Release();
pISQLErrorInfo = NULL;
}
// Test to ensure the reference is valid, then
// get error information from ISQLServerErrorInfo.
if (pISQLServerErrorInfo != NULL) {
pISQLServerErrorInfo->GetErrorInfo(&pSSErrorInfo,&pSSErrorStrings);
// ISQLServerErrorInfo::GetErrorInfo succeeds
// even when it has nothing to return. Test the
// pointers before using.
if (pSSErrorInfo) {
// Display the state and severity from the
// returned information. The error message comes
// from IErrorInfo::GetDescription.
wprintf(L"Error state:\t%d\nSeverity:\t%d\n",
pSSErrorInfo->bState,
pSSErrorInfo->bClass);
// IMalloc::Free needed to release references
// on returned values. For the example, assume
// the g_pIMalloc pointer is valid.
CoTaskMemFree(pSSErrorStrings);
CoTaskMemFree(pSSErrorInfo);
}
pISQLServerErrorInfo->Release();
pISQLServerErrorInfo = NULL;
}
if (SUCCEEDED(pIErrorRecords->GetErrorInfo(nRec,MYLOCALEID, &pIErrorInfoRecord))) {
// Get the source and description (error message)
// from the record's IErrorInfo.
pIErrorInfoRecord->GetSource(&bstrSource);
pIErrorInfoRecord->GetDescription(&bstrDescription);
if (bstrSource != NULL) {
wprintf(L"Source:\t\t%s\n", bstrSource);
SysFreeString(bstrSource);
}
if (bstrDescription != NULL) {
wprintf(L"Error message:\t%s\n", bstrDescription);
SysFreeString(bstrDescription);
}
pIErrorInfoRecord->Release();
pIErrorInfoRecord = NULL;
}
}
pIErrorRecords->Release();
pIErrorRecords = NULL;
}
else {
// IErrorInfo is valid; get the source and
// description to see what it is.
pIErrorInfoAll->GetSource(&bstrSource);
pIErrorInfoAll->GetDescription(&bstrDescription);
if (bstrSource != NULL) {
wprintf(L"Source:\t\t%s\n", bstrSource);
SysFreeString(bstrSource);
}
if (bstrDescription != NULL) {
wprintf(L"Error message:\t%s\n", bstrDescription);
SysFreeString(bstrDescription);
}
}
pIErrorInfoAll->Release();
pIErrorInfoAll = NULL;
}
pISupportErrorInfo->Release();
pISupportErrorInfo = NULL;
}
// compile with: /D "_UNICODE" /D "UNICODE" ole32.lib oleaut32.lib
#include "stdafx.h"
#include "OLEDBUtils.hpp"
class BaseAggregatingRowset : public IRowset {
public:
BaseAggregatingRowset(DBCOUNTITEM cTotalRows) : m_cRef(0), m_idxRow(1), m_cTotalRows(cTotalRows), m_pUnkInnerMSOLEDBSQLRowset(NULL) {
m_hAccessor[0] = 0;
}
virtual HRESULT SetupAccessors(IAccessor* pIAccessorTVP) = 0;
STDMETHODIMP_(ULONG) AddRef() {
ULONG cRef = InterlockedIncrement((long*)&m_cRef);
return cRef;
}
STDMETHODIMP_(ULONG) Release() {
assert(m_cRef > 0);
ULONG cRef = InterlockedDecrement((long *) &m_cRef);
if (!cRef)
delete this;
return cRef;
}
// In QueryInterface, delegate to Inner Rowset for anything but IRowset & IUnknown
STDMETHODIMP QueryInterface (REFIID riid, LPVOID* ppv ) {
if (riid == IID_IUnknown)
*ppv = static_cast<IUnknown*>(this);
else {
// If we are not initialized yet and somebody is asking for non-Unk interface
if (!m_pUnkInnerMSOLEDBSQLRowset) {
*ppv = NULL;
return E_NOINTERFACE;
}
if (riid == IID_IRowset)
*ppv = static_cast<IUnknown*>(this);
else
return m_pUnkInnerMSOLEDBSQLRowset->QueryInterface(riid, ppv);
}
(reinterpret_cast<IUnknown*>(*ppv))->AddRef();
return S_OK;
}
STDMETHODIMP AddRefRows (DBCOUNTITEM, const HROW[], DBREFCOUNT[], DBROWSTATUS[]) {
// Never gets called, so we can return E_NOTIMPL
return E_NOTIMPL;
}
// Read the data from storage, allocate row handles and give
// them back to the caller.
STDMETHODIMP GetNextRows( HCHAPTER, DBROWOFFSET cRowsToSkip, DBROWCOUNT cRows, DBCOUNTITEM* pcRowsObtained, HROW** prghRows) {
assert(cRowsToSkip == 0);
assert(cRows == 1);
assert(*prghRows);
*pcRowsObtained = 0;
// If we still have rows to give back
if (m_idxRow <= m_cTotalRows) {
*pcRowsObtained = 1;
// For us, row handle is simply an index in our row list
HROW* phRows = *prghRows;
*phRows = m_idxRow;
m_idxRow++;
return S_OK;
}
else
return DB_S_ENDOFROWSET;
}
// Release data that is not needed corresponding to row handle
STDMETHODIMP ReleaseRows(DBCOUNTITEM cRows, const HROW rghRows[], DBROWOPTIONS[], DBREFCOUNT[], DBROWSTATUS[]) {
assert(cRows == 1);
assert(rghRows[0] <= m_cTotalRows);
return S_OK;
}
STDMETHODIMP GetData(HROW, HACCESSOR hAccessor, void*) {
#ifdef _DEBUG
DBORDINAL idxAccessor;
for (idxAccessor = 0; idxAccessor < 1; idxAccessor++) {
if (m_hAccessor[idxAccessor] == hAccessor)
break;
}
assert(idxAccessor < 1);
#endif
return S_OK;
}
STDMETHODIMP RestartPosition( HCHAPTER) {
m_idxRow = 1;
return S_OK;
}
protected:
DBCOUNTITEM m_idxRow;
IUnknown* m_pUnkInnerMSOLEDBSQLRowset;
// Make the destructor private, so that the object is only creatable on the heap
virtual ~BaseAggregatingRowset() {
HRESULT hr = S_OK;
if (m_hAccessor[0]) {
IAccessor* pIAccessor = NULL;
hr = m_pUnkInnerMSOLEDBSQLRowset->QueryInterface(IID_IAccessor, reinterpret_cast<void**>(&pIAccessor));
assert(SUCCEEDED(hr));
hr = pIAccessor->ReleaseAccessor(m_hAccessor[0], NULL);
assert(SUCCEEDED(hr));
}
::Release(&m_pUnkInnerMSOLEDBSQLRowset);
}
// Save the handle of the accessor that we create, the indexing is 0 based
void SetAccessorHandle(DBORDINAL idxAccessor, HACCESSOR hAccessor) {
m_hAccessor[idxAccessor] = hAccessor;
}
private:
ULONG m_cRef;
DBCOUNTITEM m_cTotalRows;
// Defining as an array because in general there can be as many accessors as necessary
// the reading rules from the provider for such scenarios are describe in the Books online
HACCESSOR m_hAccessor[1];
};
// There is just 1 accessor for this Rowset
class EmployeesRowset : public BaseAggregatingRowset {
private:
struct EmployeeData {
DBLENGTH nameLength;
DBSTATUS nameStatus;
wchar_t nameValue[50 + 1];
DBLENGTH birthdayLength;
DBSTATUS birthdayStatus;
DBDATE birthdayValue;
DBLENGTH salaryLength;
DBSTATUS salaryStatus;
long salaryValue;
DBLENGTH photographLength;
DBSTATUS photographStatus;
IUnknown* photographValue;
};
protected:
// Make the destructor private, so that the object is only creatable on the heap
virtual ~EmployeesRowset() {}
public:
EmployeesRowset ( DBCOUNTITEM cTotalRows ) : BaseAggregatingRowset(cTotalRows) {
// For the random number generator, used for producing dummy random data
srand(123456);
}
// Set up aggregator & aggregatee relationship here
HRESULT Initialize(IOpenRowset* pIOpenRowset) {
HRESULT hr = S_OK;
IUnknown* pUnkOuter = static_cast<IUnknown*>(this);
IAccessor* pIAccessorEmployees = NULL;
DBID dbidEmployees;
dbidEmployees.eKind = DBKIND_GUID_NAME;
dbidEmployees.uGuid.guid = CLSID_ROWSET_TVP;
dbidEmployees.uName.pwszName = L"tvpEmployees";
hr = pIOpenRowset->OpenRowset(pUnkOuter, &dbidEmployees, NULL, IID_IUnknown, 0, NULL, &m_pUnkInnerMSOLEDBSQLRowset);
CHKHR_OLEDB_GOTO(hr, _Exit, pIOpenRowset, IID_IOpenRowset);
hr = pUnkOuter->QueryInterface(IID_IAccessor, reinterpret_cast<void**>(&pIAccessorEmployees));
CHKHR_GOTO_MSG(hr, _Exit, L"Failed to QI IAccessor.");
hr = SetupAccessors(pIAccessorEmployees);
CHKHR_GOTO(hr, _Exit);
_Exit:
::Release(&pIAccessorEmployees);
return hr;
}
STDMETHODIMP GetData ( HROW hRow, HACCESSOR hAccessor, void* pData ) {
// The base implementation just does validation, could have possibly
// been made an abstract virtual function
BaseAggregatingRowset::GetData(hRow, hAccessor, pData);
// Use m_hAccessor, to figure out which accessor caller specified, and write the columns data
// for columns corresponding to those accessors into pData. Fetch the data into provided buffer,
// we will know the format of these accessors, because we created them.
EmployeeData* pCurrentEmployee = reinterpret_cast<EmployeeData*>(pData);
FillRowData(pCurrentEmployee);
return S_OK;
}
private:
HRESULT SetupAccessors(IAccessor* pIAccessorEmployees) {
HRESULT hr = S_OK;
DBBINDING bindingsEmployees[4];
FillBindingsAndSetupRowBuffer(bindingsEmployees);
HACCESSOR hAccessorEmployees;
DBBINDSTATUS bindStatusEmployees[4] = {DBBINDSTATUS_OK, DBBINDSTATUS_OK, DBBINDSTATUS_OK, DBBINDSTATUS_OK};
hr = pIAccessorEmployees->CreateAccessor(
DBACCESSOR_ROWDATA,
4,
bindingsEmployees,
sizeof(EmployeeData),
&hAccessorEmployees,
bindStatusEmployees);
CHKHR_OLEDB_GOTO(hr, _Exit, pIAccessorEmployees, IID_IAccessor);
SetAccessorHandle(0, hAccessorEmployees);
_Exit:
return hr;
}
// This routine does the job of populating data for each row, in real world scenarios, hRow could
// possibly be passed here, in order to identify the particular row of data & it could be read
// from some persistent medium like disk/network/UI-controls etc
void FillRowData(EmployeeData* pCurrentEmployee) {
pCurrentEmployee->birthdayStatus = DBSTATUS_S_OK;
pCurrentEmployee->birthdayLength = sizeof(DBDATE);
pCurrentEmployee->birthdayValue.day = 15;
pCurrentEmployee->birthdayValue.month = 5;
pCurrentEmployee->birthdayValue.year = 1980;
pCurrentEmployee->salaryLength = sizeof(long);
pCurrentEmployee->salaryStatus = DBSTATUS_S_OK;
pCurrentEmployee->salaryValue = 100000;
pCurrentEmployee->nameLength = static_cast<DBLENGTH>(wcslen(L"John Doe") * sizeof(wchar_t));
pCurrentEmployee->nameStatus = DBSTATUS_S_OK;
StringCchCopy(pCurrentEmployee->nameValue, sizeof(pCurrentEmployee->nameValue) / sizeof(wchar_t), L"John Doe");
pCurrentEmployee->photographLength = 2000 + (rand() % 2000);
pCurrentEmployee->photographStatus = DBSTATUS_S_OK;
pCurrentEmployee->photographValue = new CPhotograph(pCurrentEmployee->photographLength);
}
void FillBindingsAndSetupRowBuffer(DBBINDING* pBindingsEmployees) {
for (DBORDINAL i = 0; i < 4; i++) {
pBindingsEmployees[i].pTypeInfo = NULL;
pBindingsEmployees[i].pObject = NULL;
pBindingsEmployees[i].pBindExt = NULL;
pBindingsEmployees[i].eParamIO = DBPARAMIO_NOTPARAM;
pBindingsEmployees[i].iOrdinal = i + 1;
pBindingsEmployees[i].dwPart = DBPART_LENGTH | DBPART_VALUE | DBPART_STATUS;
pBindingsEmployees[i].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
pBindingsEmployees[i].dwFlags = 0;
}
pBindingsEmployees[0].wType = DBTYPE_WSTR;
pBindingsEmployees[0].cbMaxLen = (50 + 1) * sizeof(wchar_t);
pBindingsEmployees[0].obLength = offsetof(EmployeeData, nameLength);
pBindingsEmployees[0].obStatus = offsetof(EmployeeData, nameStatus);
pBindingsEmployees[0].obValue = offsetof(EmployeeData, nameValue);
pBindingsEmployees[1].wType = DBTYPE_DBDATE;
pBindingsEmployees[1].cbMaxLen = sizeof(DBDATE);
pBindingsEmployees[1].obLength = offsetof(EmployeeData, birthdayLength);
pBindingsEmployees[1].obStatus = offsetof(EmployeeData, birthdayStatus);
pBindingsEmployees[1].obValue = offsetof(EmployeeData, birthdayValue);
pBindingsEmployees[2].wType = DBTYPE_I4;
pBindingsEmployees[2].cbMaxLen = sizeof(long);
pBindingsEmployees[2].obLength = offsetof(EmployeeData, salaryLength);
pBindingsEmployees[2].obStatus = offsetof(EmployeeData, salaryStatus);
pBindingsEmployees[2].obValue = offsetof(EmployeeData, salaryValue);
pBindingsEmployees[3].wType = DBTYPE_IUNKNOWN;
pBindingsEmployees[3].cbMaxLen = sizeof(IUnknown*);
pBindingsEmployees[3].obLength = offsetof(EmployeeData, photographLength);
pBindingsEmployees[3].obStatus = offsetof(EmployeeData, photographStatus);
pBindingsEmployees[3].obValue = offsetof(EmployeeData, photographValue);
}
};
HRESULT PopulateEmployees(IDBCreateCommand* pIDBCreateCommand, IRowset* pIRowsetEmployees) {
HRESULT hr = S_OK;
// Create the RPC call
ICommandText* pICommandText = NULL;
ISSCommandWithParameters* pISSCommandWithParameters = NULL;
IAccessor* pIAccessorCmd = NULL;
HACCESSOR hAccessorCmd;
DBBINDING bindingsCmd [2] = {0};
DBBINDSTATUS bindStatusCmd[2] = {DBBINDSTATUS_OK, DBBINDSTATUS_OK};
DBOBJECT dbObjTVP = {STGM_READ, IID_IRowset};
hr = pIDBCreateCommand->CreateCommand(NULL, IID_ICommandText, reinterpret_cast<IUnknown**>(&pICommandText));
CHKHR_OLEDB_GOTO(hr, _Exit, pIDBCreateCommand, IID_IDBCreateCommand);
hr = pICommandText->SetCommandText(DBGUID_DEFAULT, L"{call insertEmployees(?, ?)}");
CHKHR_OLEDB_GOTO(hr, _Exit, pICommandText, IID_ICommandText);
hr = pICommandText->QueryInterface(IID_ISSCommandWithParameters, reinterpret_cast<void**>(&pISSCommandWithParameters));
CHKHR_GOTO_MSG(hr, _Exit, L"Failed to QI IUnknown for ISSCommandWithParameters.");
// Give the parameter information to the provider
const DB_UPARAMS rgParamOrdinalsEmployees[2] = {1, 2};
DBPARAMBINDINFO rgParamBindInfoEmployees[2] = {0};
rgParamBindInfoEmployees[0].pwszDataSourceType = L"table";
rgParamBindInfoEmployees[0].pwszName = L"@tvpEmployees";
rgParamBindInfoEmployees[0].ulParamSize = ~0UL;
rgParamBindInfoEmployees[0].dwFlags = DBPARAMFLAGS_ISINPUT;
rgParamBindInfoEmployees[1].pwszDataSourceType = L"DBTYPE_I4";
rgParamBindInfoEmployees[1].pwszName = L"@id";
rgParamBindInfoEmployees[1].ulParamSize = sizeof(long);
rgParamBindInfoEmployees[1].dwFlags = DBPARAMFLAGS_ISOUTPUT;
hr = pISSCommandWithParameters->SetParameterInfo(2, rgParamOrdinalsEmployees, rgParamBindInfoEmployees);
CHKHR_OLEDB_GOTO(hr, _Exit, pISSCommandWithParameters, IID_ISSCommandWithParameters);
DBPROP ssPropParam [1] = {0};
DBPROPSET ssPropsetParam [1];
SSPARAMPROPS ssParamProps [1];
ssPropParam[0].dwPropertyID = SSPROP_PARAM_TYPE_TYPENAME;
ssPropParam[0].vValue.vt = VT_BSTR;
ssPropParam[0].vValue.bstrVal = SysAllocString(L"tvpEmployees");
ssPropsetParam[0].cProperties = 1;
ssPropsetParam[0].guidPropertySet = DBPROPSET_SQLSERVERPARAMETER;
ssPropsetParam[0].rgProperties = ssPropParam;
ssParamProps[0].cPropertySets = 1;
ssParamProps[0].iOrdinal = 1;
ssParamProps[0].rgPropertySets = ssPropsetParam;
hr = pISSCommandWithParameters->SetParameterProperties(1, ssParamProps);
SysFreeString(ssPropParam[0].vValue.bstrVal);
CHKHR_OLEDB_GOTO(hr, _Exit, pISSCommandWithParameters, IID_ISSCommandWithParameters);
struct PARAMDATA {
DBLENGTH employeesLength;
DBSTATUS employeesStatus;
IUnknown * employeesValue;
DBLENGTH idLength;
DBSTATUS idStatus;
long idValue;
};
PARAMDATA cmdParamData;
hr = pICommandText->QueryInterface(IID_IAccessor, reinterpret_cast<void**>(&pIAccessorCmd));
CHKHR_GOTO_MSG(hr, _Exit, L"Failed to QI IUnknown for IAccessor.");
// Define the binding information
bindingsCmd[0].wType = DBTYPE_TABLE;
bindingsCmd[0].cbMaxLen = sizeof(IUnknown*);
bindingsCmd[0].pObject = &dbObjTVP;
bindingsCmd[0].eParamIO = DBPARAMIO_INPUT;
bindingsCmd[0].iOrdinal = 1;
bindingsCmd[0].dwPart = DBPART_LENGTH | DBPART_VALUE | DBPART_STATUS;
bindingsCmd[0].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
bindingsCmd[0].obLength = offsetof(PARAMDATA, employeesLength);
bindingsCmd[0].obStatus = offsetof(PARAMDATA, employeesStatus);
bindingsCmd[0].obValue = offsetof(PARAMDATA, employeesValue);
bindingsCmd[1].wType = DBTYPE_I4;
bindingsCmd[1].cbMaxLen = sizeof(long);
bindingsCmd[1].pObject = NULL;
bindingsCmd[1].eParamIO = DBPARAMIO_OUTPUT;
bindingsCmd[1].iOrdinal = 2;
bindingsCmd[1].dwPart = DBPART_LENGTH | DBPART_VALUE | DBPART_STATUS;
bindingsCmd[1].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
bindingsCmd[1].obLength = offsetof(PARAMDATA, idLength);
bindingsCmd[1].obStatus = offsetof(PARAMDATA, idStatus);
bindingsCmd[1].obValue = offsetof(PARAMDATA, idValue);
hr = pIAccessorCmd->CreateAccessor(
DBACCESSOR_PARAMETERDATA,
2,
bindingsCmd,
sizeof(PARAMDATA),
&hAccessorCmd,
bindStatusCmd);
CHKHR_OLEDB_GOTO(hr, _Exit, pIAccessorCmd, IID_IAccessor);
// Fill cmdParamData with parameter values
cmdParamData.employeesLength = sizeof(IUnknown*);
cmdParamData.employeesStatus = DBSTATUS_S_OK;
cmdParamData.employeesValue = pIRowsetEmployees;
cmdParamData.idLength = sizeof(long);
cmdParamData.idStatus = DBSTATUS_S_OK;
cmdParamData.idValue = 0;
// Execute the command
DBPARAMS cmdParams;
cmdParams.cParamSets = 1;
cmdParams.hAccessor = hAccessorCmd;
cmdParams.pData = &cmdParamData;
hr = pICommandText->Execute(NULL, IID_NULL, &cmdParams, NULL, NULL);
CHKHR_OLEDB_GOTO(hr, _Exit, pICommandText, IID_ICommandText);
wprintf(L"Employee table population completed. ID : %d.\n", cmdParamData.idValue);
_Exit:
Release(&pIAccessorCmd);
Release(&pISSCommandWithParameters);
Release(&pICommandText);
return hr;
}
int main() {
HRESULT hr = S_OK;
CCOMLoader comLoader;
CMSOLEDBSQLDataSource dso;
IOpenRowset*pIOpenRowset = NULL;
IDBCreateCommand* pIDBCreateCommand = NULL;
IRowset* pIRowsetEmployees = NULL;
hr = comLoader.Load();
CHKHR_GOTO_MSG(hr, _Exit, L"Unable to Load COM.");
hr = dso.Connect(L"localhost", L"testdb");
CHKHR_GOTO(hr, _Exit);
hr = dso.GetSession(&pIOpenRowset);
CHKHR_GOTO(hr, _Exit);
hr = pIOpenRowset->QueryInterface(IID_IDBCreateCommand, reinterpret_cast<void**>(&pIDBCreateCommand));
CHKHR_GOTO_MSG(hr, _Exit, L"Failed to QI for IDBCreateCommand.");
EmployeesRowset* pEmployeesRowset = new EmployeesRowset(20);
if (pEmployeesRowset == NULL) {
hr = E_OUTOFMEMORY;
CHKHR_GOTO_MSG(hr, _Exit, L"Out of memory.");
}
// Do an extra AddRef. This IUnknown will be automatically released by the command execution code
pEmployeesRowset->AddRef();
hr = pEmployeesRowset->Initialize(pIOpenRowset);
CHKHR_GOTO(hr, _Exit);
hr = pEmployeesRowset->QueryInterface(IID_IRowset, reinterpret_cast<void**>(&pIRowsetEmployees));
CHKHR_GOTO_MSG(hr, _Exit, L"Failed to QI IRowset for Employees Rowset.");
hr = PopulateEmployees(pIDBCreateCommand, pIRowsetEmployees);
CHKHR_GOTO(hr, _Exit);
_Exit:
Release(&pIRowsetEmployees);
Release(&pIDBCreateCommand);
Release(&pIOpenRowset);
return SUCCEEDED(hr) ? EXIT_SUCCESS : EXIT_FAILURE;
}
use master
IF EXISTS (SELECT name FROM master..sysdatabases WHERE name = 'testdb')
DROP DATABASE [testdb]
go