IBCPSession::BCPDone (OLE DB)
Применимо: 
SQL Server База данных SQL Azure Управляемый экземпляр SQL Azure azure Synapse Analytics Analytics Platform System (PDW)
Фиксирует оставшиеся строки, отправляемые в SQL Server.
Синтаксис
HRESULT BCPDone(void);
Замечания
Никакая другая операция не может быть вызвана применительно к интерфейсу IBCPSession после вызова метода BCPDone. Единственной возможностью является вызов метода IBCPSession::BCPInit для инициализации операции массового копирования. Это аналогично вызову метода IRowsetFastLoad::Commit.
Значения кода возврата
S_OK
Метод выполнен успешно.
E_UNEXPECTED
Непредвиденный вызов метода. Например, перед вызовом этого метода не был вызван метод BCPInit .
Пример
В этом образце показано, как использовать интерфейс IBCPSession .
Перед запуском этого образца необходимо выполнить следующий код Transact-SQL :
create table fltest(col1 int, col2 int, col3 image)
insert into fltest values (1, 1, 0x0FF)
insert into fltest values (2, 2, 0xF00)
insert into fltest values (3, 3, 0xBAD)
insert into fltest values (4, 4, 0xFAD)
Образец устанавливает подключение к базе данных master.
Во время работы образца в каталоге проекта создается файл outfile.dat. Файл outfile.dat содержит данные, скопированные из таблицы в собственном (двоичном) режиме.
Чтобы вновь добавить эти данные в таблицу, можно использовать следующую команду BCP:
bcp master..fltest in outfile.dat -n -T -S server
#define DBINITCONSTANTS // Defined to initialize constants in oledb.h
#define INITGUID
#define MAX_ROWS 100
#include <windows.h>
#include <sqlext.h>
#include <msoledbsql.h>
#include <oledberr.h>
#include <stdio.h>
#define SAFE_RELEASE(p) { \
if (p) { \
(p)->Release(); \
(p)=NULL; \
} \
}
// DumpErrorInfo queries error interfaces, retrieving available status or error information.
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;
// Hard-code a US English locale for the example.
DWORD MYLOCALEID = 0x0409;
// Only ask for error information if the interface supports it.
if (FAILED(pObjectWithError->QueryInterface(IID_ISupportErrorInfo, (void**) &pISupportErrorInfo))) {
wprintf(L"SupportErrorErrorInfo interface not supported\r\n");
return;
}
if (FAILED(pISupportErrorInfo->InterfaceSupportsErrorInfo(IID_InterfaceWithError))) {
wprintf(L"InterfaceWithError interface not supported\r\n");
return;
}
// Do not test the return of GetErrorInfo. It can succeed and return
// a NULL pointer in pIErrorInfoAll. Simply test the pointer.
GetErrorInfo(0, &pIErrorInfoAll);
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 = 0; nRec < nRecs; nRec++) {
// From IErrorRecords, get the HRESULT and a reference to the ISQLErrorInfo interface.
pIErrorRecords->GetBasicErrorInfo(nRec, &errorinfo);
pIErrorRecords->GetCustomErrorObject(nRec,IID_ISQLErrorInfo, (IUnknown**) &pISQLErrorInfo);
// Display the HRESULT, then use the ISQLErrorInfo.
wprintf(L"HRESULT:\t%#X\r\n", errorinfo.hrError);
if (pISQLErrorInfo != NULL) {
pISQLErrorInfo->GetSQLInfo(&bstrSQLSTATE, &lNativeError);
// Display the SQLSTATE and native error values.
wprintf(L"SQLSTATE:\t%s\r\nNative Error:\t%ld\r\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();
}
// 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\r\nSeverity:\t%d\r\n", pSSErrorInfo->bState, pSSErrorInfo->bClass);
// IMalloc::Free needed to release references on returned values.
CoTaskMemFree(pSSErrorStrings);
CoTaskMemFree(pSSErrorInfo);
}
pISQLServerErrorInfo->Release();
}
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\r\n", bstrSource);
SysFreeString(bstrSource);
}
if (bstrDescription != NULL) {
wprintf(L"Error message:\t%s\r\n", bstrDescription);
SysFreeString(bstrDescription);
}
pIErrorInfoRecord->Release();
}
}
pIErrorRecords->Release();
}
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\r\n", bstrSource);
SysFreeString(bstrSource);
}
if (bstrDescription != NULL) {
wprintf(L"Error message:\t%s\r\n", bstrDescription);
SysFreeString(bstrDescription);
}
}
pIErrorInfoAll->Release();
}
else
wprintf(L"GetErrorInfo has not returned ErrorInfo.\r\n");
pISupportErrorInfo->Release();
return;
}
IDBCreateSession *Connect () {
// constant definitions
static LPCWSTR pwszProviderString = L"server=(local)\\dschwart3;Database=master;Trusted_Connection=yes;";
static LPCWSTR pwszDataSource = NULL;
static LPCWSTR pwszUserID = NULL;
static LPCWSTR pwszPassword = NULL;
IDBInitialize * pIDBInitialize = NULL;
IDBProperties * pIDBProperties = NULL;
IDBCreateSession * pIDBCreateSession = NULL;
HRESULT hr;
// Obtain the provider's clsid
CLSID clsidProv = CLSID_MSOLEDBSQL;
// Initialize COM
CoInitialize(NULL);
hr = CoCreateInstance(clsidProv, NULL, CLSCTX_ALL, IID_IDBInitialize,(void **)&pIDBInitialize);
if (!SUCCEEDED(hr))
return NULL;
hr = pIDBInitialize->QueryInterface(IID_IDBProperties, (void **)&pIDBProperties);
if (!SUCCEEDED(hr))
return NULL;
// Set Init properties
{
DBPROPSET rgPropSets[1];
ULONG cPropSets = 0;
DBPROP rgInitProperties[10];
// Initialize Data source properties (connection info)
{
ULONG cProperties = 0;
// DBPROP_INIT_DATASOURCE
if (pwszDataSource) {
rgInitProperties[cProperties].dwPropertyID = DBPROP_INIT_DATASOURCE;
rgInitProperties[cProperties].dwOptions = DBPROPOPTIONS_REQUIRED;
rgInitProperties[cProperties].dwStatus = DBPROPSTATUS_OK;
rgInitProperties[cProperties].colid = DB_NULLID;
rgInitProperties[cProperties].vValue.vt = VT_BSTR;
V_BSTR(&rgInitProperties[cProperties].vValue) = SysAllocString(pwszDataSource);
cProperties++;
}
// DBPROP_AUTH_USERID
if (pwszUserID) {
rgInitProperties[cProperties].dwPropertyID = DBPROP_AUTH_USERID;
rgInitProperties[cProperties].dwOptions = DBPROPOPTIONS_REQUIRED;
rgInitProperties[cProperties].dwStatus = DBPROPSTATUS_OK;
rgInitProperties[cProperties].colid = DB_NULLID;
rgInitProperties[cProperties].vValue.vt = VT_BSTR;
V_BSTR(&rgInitProperties[cProperties].vValue) = SysAllocString(pwszUserID);
cProperties++;
}
// DBPROP_AUTH_PASSWORD
if (pwszPassword) {
rgInitProperties[cProperties].dwPropertyID = DBPROP_AUTH_PASSWORD;
rgInitProperties[cProperties].dwOptions = DBPROPOPTIONS_REQUIRED;
rgInitProperties[cProperties].dwStatus = DBPROPSTATUS_OK;
rgInitProperties[cProperties].colid = DB_NULLID;
rgInitProperties[cProperties].vValue.vt = VT_BSTR;
V_BSTR(&rgInitProperties[cProperties].vValue) = SysAllocString(pwszPassword);
cProperties++;
}
// DBPROP_INIT_PROVIDERSTRING
if (pwszProviderString) {
rgInitProperties[cProperties].dwPropertyID = DBPROP_INIT_PROVIDERSTRING;
rgInitProperties[cProperties].dwOptions = DBPROPOPTIONS_REQUIRED;
rgInitProperties[cProperties].dwStatus = DBPROPSTATUS_OK;
rgInitProperties[cProperties].colid = DB_NULLID;
rgInitProperties[cProperties].vValue.vt = VT_BSTR;
V_BSTR(&rgInitProperties[cProperties].vValue) = SysAllocString(pwszProviderString);
cProperties++;
}
if (cProperties) {
rgPropSets[cPropSets].cProperties = cProperties;
rgPropSets[cPropSets].rgProperties = rgInitProperties;
rgPropSets[cPropSets].guidPropertySet = DBPROPSET_DBINIT;
cPropSets++;
}
}
// Initialize
hr = pIDBProperties->SetProperties(cPropSets, rgPropSets);
if (!SUCCEEDED(hr)) {
DumpErrorInfo(pIDBProperties, IID_IDBProperties);
return NULL;
}
}
SAFE_RELEASE(pIDBProperties);
hr = pIDBInitialize->Initialize();
if (!SUCCEEDED(hr)) {
DumpErrorInfo(pIDBInitialize, IID_IDBInitialize);
return NULL;
}
hr = pIDBInitialize->QueryInterface(IID_IDBProperties, (void **)&pIDBProperties);
if (!SUCCEEDED(hr)) {
DumpErrorInfo(pIDBInitialize, IID_IDBInitialize);
return NULL;
}
// Set SQL Server Specific properties
{
DBPROPSET rgPropSets[1];
ULONG cPropSets = 0;
DBPROP rgSqlProperties[10];
// Initialize the DBProps for fastload and BCP
{
ULONG cProperties = 0;
// SSPROP_ENABLEFASTLOAD
{
rgSqlProperties[cProperties].dwPropertyID = SSPROP_ENABLEFASTLOAD;
rgSqlProperties[cProperties].dwOptions = DBPROPOPTIONS_REQUIRED;
rgSqlProperties[cProperties].dwStatus = DBPROPSTATUS_OK;
rgSqlProperties[cProperties].colid = DB_NULLID;
rgSqlProperties[cProperties].vValue.vt = VT_BOOL;
V_BOOL(&rgSqlProperties[cProperties].vValue)= VARIANT_TRUE;
cProperties++;
}
// SSPROP_ENABLEBULKCOPY
{
rgSqlProperties[cProperties].dwPropertyID = SSPROP_ENABLEBULKCOPY;
rgSqlProperties[cProperties].dwOptions = DBPROPOPTIONS_REQUIRED;
rgSqlProperties[cProperties].dwStatus = DBPROPSTATUS_OK;
rgSqlProperties[cProperties].colid = DB_NULLID;
rgSqlProperties[cProperties].vValue.vt = VT_BOOL;
V_BOOL(&rgSqlProperties[cProperties].vValue)= VARIANT_TRUE;
cProperties++;
}
rgPropSets[cPropSets].cProperties = cProperties;
rgPropSets[cPropSets].rgProperties = rgSqlProperties;
rgPropSets[cPropSets].guidPropertySet = DBPROPSET_SQLSERVERDATASOURCE;
cPropSets++;
}
hr = pIDBProperties->SetProperties(cPropSets, rgPropSets);
if (!SUCCEEDED(hr)) {
DumpErrorInfo(pIDBProperties, IID_IDBProperties);
return NULL;
}
}
SAFE_RELEASE(pIDBProperties);
hr = pIDBInitialize->QueryInterface(IID_IDBCreateSession, (void **)&pIDBCreateSession);
if (!SUCCEEDED(hr)) {
DumpErrorInfo(pIDBInitialize, IID_IDBInitialize);
return NULL;
}
SAFE_RELEASE(pIDBInitialize);
return pIDBCreateSession;
}
void wmain() {
static LPCWSTR pwszTableName = L"fltest";
static LPCWSTR pwszOutFileName = L"outfile.dat";
static LPCWSTR pwszErrFileName = L"errfile.txt";
DBROWCOUNT icRowsCopied = 0;
IDBCreateSession * pIDBCreateSession = NULL;
IBCPSession * pIBCPSession = NULL;
HRESULT hr;
pIDBCreateSession = Connect();
if (!pIDBCreateSession) {
printf("Failed to connect\r\n");
exit(1);
}
// get an IBCPSession interface
hr = pIDBCreateSession->CreateSession(NULL, IID_IBCPSession, (IUnknown**) &pIBCPSession);
if (FAILED(hr)) {
printf("Failed to obtain an IBCPSession interface\r\n");
DumpErrorInfo(pIDBCreateSession, IID_IDBCreateSession);
exit(1);
}
SAFE_RELEASE(pIDBCreateSession);
// Initialize BCP
// Here we create the mapping between file and table, identifying
// which is the source and which is the destination through the final parameter
// (here we are copying out of the table and into the file).
hr = pIBCPSession->BCPInit(pwszTableName, pwszOutFileName, pwszErrFileName, BCP_DIRECTION_OUT);
if (FAILED(hr)) {
printf("BCPInit failed.\r\n");
DumpErrorInfo(pIBCPSession, IID_IBCPSession);
exit(1);
}
// You can set SSPROP_ASYNCH_BULKCOPY to TRUE to improve client latency here,
// at which point BCPExec can return DB_S_ASYNCHRONOUS.
do {
hr = pIBCPSession->BCPExec(&icRowsCopied);
} while (hr == DB_S_ASYNCHRONOUS);
if (FAILED(hr)) {
printf("BCPExec failed.\r\n");
DumpErrorInfo(pIBCPSession, IID_IBCPSession);
exit(1);
}
// flush the rest of the rows and finalize the transaction -- the process is complete.
hr = pIBCPSession->BCPDone();
if (FAILED(hr)) {
printf("BCPDone failed.\r\n");
DumpErrorInfo(pIBCPSession, IID_IBCPSession);
exit(1);
}
SAFE_RELEASE(pIBCPSession);
CoUninitialize();
}
См. также
IBCPSession (OLE DB)
Выполнение операций массового копирования