Usar características mejoradas de fecha y hora en SQL Server Native Client (OLE DB)
Se aplica a:
SQL ServerAzure SQL DatabaseAzure SQL Managed InstanceAzure Synapse AnalyticsAnalytics Platform System (PDW)
En este ejemplo, se muestra cómo usar las características de fecha y hora que se incluyeron en SQL Server 2008 (10.0.x). En el ejemplo, se usan los cuatro nuevos tipos de fecha y hora (date, time, datetime2y datetimeoffset) para ejecutar comandos con parámetros y recuperar resultados de conjunto de filas.
En este artículo se requiere la AdventureWorks2022 base de datos de ejemplo, que puede descargar desde la página principal Ejemplos de Microsoft SQL Server y Proyectos de comunidad.
Importante
Siempre que sea posible, utilice la autenticación de Windows. Si la autenticación de Windows no está disponible, solicite a los usuarios que escriban sus credenciales en tiempo de ejecución. No guarde las credenciales en un archivo. Si tiene que conservar las credenciales, debería cifrarlas con la API de criptografía de Win32.
Ejemplo
La primera lista de códigos (Transact-SQL) crea un procedimiento almacenado que se usa en el ejemplo.
Compile con ole32.lib oleaut32.lib y ejecute la segunda lista de código (C++). Esta aplicación se conecta a la instancia predeterminada de SQL Server del equipo. En algunos sistemas operativos Windows, deberá cambiar (localhost) o (local) al nombre de la instancia de SQL Server . Para conectarse a una instancia con nombre, cambie la cadena de conexión de L"(local)" a L"(local)\\name", donde "name" es la instancia con nombre. De forma predeterminada, SQL Server Express se instala en una instancia con nombre. Asegúrese de que la variable de entorno INCLUDE incluye el directorio que contiene sqlncli.h.
La tercera lista de códigos (Transact-SQL) elimina el procedimiento almacenado que se usa en el ejemplo.
CREATE PROCEDURE sp_datetimetypes
@date_param DATE OUTPUT,
@time_param TIME(7) OUTPUT,
@datetime2_param DATETIME2(7) OUTPUT,
@datetimeoffset_param DATETIMEOFFSET(7) OUTPUT
AS
SELECT @date_param, @time_param, @datetime2_param, @datetimeoffset_param
GO
// compile with: ole32.lib oleaut32.lib
#define WIN32_LEAN_AND_MEAN
#include <stdio.h>
#include <tchar.h>
#include <sqlncli.h>
#include "oledberr.h"
#include <stddef.h>
static const DBLENGTH sc_cchStrLen = 64;
struct DateTimeTypeEx {
DBSTATUS status;
DBLENGTH length;
union {
DBTIMESTAMP ts;
DBDATE d;
DBTIME2 t;
DBTIMESTAMPOFFSET tso;
WCHAR wstr[sc_cchStrLen];
CHAR str[sc_cchStrLen];
};
};
struct TypePrecScalEx {
DBTYPE wType;
BYTE bPrec;
BYTE bScale;
WCHAR wszTypeName[64];
DBLENGTH ulSize;
};
HRESULT InitializeAndEstablishConnection (IUnknown ** ppUnkDBInitialize) {
HRESULT hr = S_OK;
IDBProperties * pIDBProperties = NULL;
IDBInitialize * pIDBInitialize = NULL;
DBPROPSET rgInitPropSet[1] = {0};
DBPROP InitProperties[4] = {0};
*ppUnkDBInitialize = NULL;
// Initialize the COM library.
CoInitialize(NULL);
// Obtain access to the SQL Server Native Client OLE DB provider.
hr = CoCreateInstance(CLSID_SQLNCLI11, NULL, CLSCTX_INPROC_SERVER, IID_IDBInitialize, (void **) &pIDBInitialize);
// Initialize property values needed to establish connection.
for (unsigned int i = 0 ; i < 4 ; i++)
VariantInit(&InitProperties[i].vValue);
// Server name.
// See DBPROP structure for more information on InitProperties
InitProperties[0].dwPropertyID = DBPROP_INIT_DATASOURCE;
InitProperties[0].vValue.vt = VT_BSTR;
InitProperties[0].vValue.bstrVal= SysAllocString(L"localhost");
InitProperties[0].dwOptions = DBPROPOPTIONS_REQUIRED;
InitProperties[0].colid = DB_NULLID;
// Database.
InitProperties[1].dwPropertyID = DBPROP_INIT_CATALOG;
InitProperties[1].vValue.vt = VT_BSTR;
InitProperties[1].vValue.bstrVal = SysAllocString(L"AdventureWorks");
InitProperties[1].dwOptions = DBPROPOPTIONS_REQUIRED;
InitProperties[1].colid = DB_NULLID;
// Username (login).
InitProperties[2].dwPropertyID = DBPROP_AUTH_INTEGRATED;
InitProperties[2].vValue.vt = VT_BSTR;
InitProperties[2].vValue.bstrVal = SysAllocString(L"SSPI");
InitProperties[2].dwOptions = DBPROPOPTIONS_REQUIRED;
InitProperties[2].colid = DB_NULLID;
InitProperties[3].dwOptions = DBPROPOPTIONS_REQUIRED;
InitProperties[3].colid = DB_NULLID;
// Construct the DBPROPSET structure(rgInitPropSet). The DBPROPSET structure is used to pass
// an array of DBPROP structures (InitProperties) to the SetProperties method.
rgInitPropSet[0].guidPropertySet = DBPROPSET_DBINIT;
rgInitPropSet[0].cProperties = 4;
rgInitPropSet[0].rgProperties = InitProperties;
// Set initialization properties.
hr = pIDBInitialize->QueryInterface(IID_IDBProperties, (void **)&pIDBProperties);
hr = pIDBProperties->SetProperties(1, rgInitPropSet);
pIDBProperties->Release();
// Establish the connection to the data source.
hr = pIDBInitialize->Initialize();
if (S_OK == hr)
*ppUnkDBInitialize = pIDBInitialize;
return hr;
}
// This function creates an OLE DB Session object from the given DataSource object.
HRESULT myCreateSession(IUnknown * pUnkDataSource, REFIID riid, IUnknown ** ppUnkSession) {
HRESULT hr;
IDBCreateSession * pIDBCreateSession = NULL;
// Create a session object from a data source object
hr = pUnkDataSource->QueryInterface(IID_IDBCreateSession, (void**)&pIDBCreateSession);
hr = pIDBCreateSession->CreateSession(NULL, riid, ppUnkSession);
if (pIDBCreateSession)
pIDBCreateSession->Release();
return hr;
}
// This function takes an IUnknown pointer on a Session object and attempts to create a Command object
// object using the Session's IDBCreateCommand interface. Since this interface is optional, this may fail.
HRESULT myCreateCommand(IUnknown * pUnkSession, IUnknown ** ppUnkCommand) {
HRESULT hr;
IDBCreateCommand * pIDBCreateCommand = NULL;
// Attempt to create a Command object from the Session object
hr = pUnkSession->QueryInterface(IID_IDBCreateCommand, (void**)&pIDBCreateCommand);
hr = pIDBCreateCommand->CreateCommand(NULL, IID_ISSCommandWithParameters, ppUnkCommand);
if (pIDBCreateCommand)
pIDBCreateCommand->Release();
return hr;
}
// This function takes an IUnknown pointer on a Command object and creates a new Rowset object as follows:
// * Sets the given properties on the Command object. These properties will be
// applied by the provider to any Rowset created by this Command.
// * Sets the given command text for the Command.
// * Executes the command to create a new Rowset object.
HRESULT myExecuteCommand(ISSCommandWithParameters * pUnkCommand, ULONG cPropSets, DBPROPSET* rgPropSets, IUnknown ** ppUnkRowset) {
HRESULT hr;
ICommandText * pICommandText = NULL;
ICommandProperties * pICommandProperties = NULL;
IAccessor * pIAccessor = NULL;
IAccessor * pIAccessorRowset = NULL;
HACCESSOR hAccessor = NULL;
HACCESSOR hAccessorWstr = NULL;
DBCOUNTITEM cRowsObtained = 0;
HROW * rghRow = NULL;
static const DBCOUNTITEM sc_cCol = 4;
static const DB_UPARAMS sc_cParams = sc_cCol;
static const DBROWCOUNT sc_cRows = 1;
// Bindings and values
DateTimeTypeEx rgDttEx[sc_cCol] = {0};
DBBINDING rgBindings[sc_cCol] = {0};
DBBINDSTATUS rgStatus[sc_cCol] = {0};
DBBINDING rgBindingsWstr[sc_cCol] = {0};
TypePrecScalEx rgTpsEx[sc_cCol] = {
DBTYPE_DBDATE, 0, 0, L"DATE", sizeof(DBDATE),
DBTYPE_DBTIME2, 0, 4, L"TIME", sizeof(DBTIME2),
DBTYPE_DBTIMESTAMP, 0, 4, L"DATETIME2", sizeof(DBTIMESTAMP),
DBTYPE_DBTIMESTAMPOFFSET, 0, 4, L"DATETIMEOFFSET", sizeof(DBTIMESTAMPOFFSET)
};
// Command, bindings, and param values
WCHAR * pwszCommandText = L"{call sp_datetimetypes(?,?,?,?)}";
DB_UPARAMS rgParamOrdinals[sc_cParams] = {0};
DBPARAMBINDINFO rgParamBindInfo[sc_cParams] = {0};
DBPARAMS myDBPARAMS = {0};
// Set param ordinals
for (unsigned int i = 0; i < sc_cParams; i++)
rgParamOrdinals[i] = i + 1;
// Set param bind info
for (unsigned int i = 0; i < sc_cParams; i++) {
rgParamBindInfo[i].pwszDataSourceType = rgTpsEx[i].wszTypeName;
rgParamBindInfo[i].bPrecision = rgTpsEx[i].bPrec;
rgParamBindInfo[i].bScale = rgTpsEx[i].bScale;
rgParamBindInfo[i].dwFlags = DBPARAMFLAGS_ISINPUT | DBPARAMFLAGS_ISOUTPUT | DBPARAMFLAGS_ISNULLABLE;
rgParamBindInfo[i].pwszName = NULL;
rgParamBindInfo[i].ulParamSize = rgTpsEx[i].ulSize;
}
// Prepare bindings
for (unsigned int i = 0; i < sc_cParams; i++) {
rgBindings[i].iOrdinal = i+1;
rgBindings[i].obValue = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, t);
rgBindings[i].obLength = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, length);
rgBindings[i].obStatus = (i * sizeof(DateTimeTypeEx));
rgBindings[i].pTypeInfo = NULL;
// rgBindings[i].pObject not used
rgBindings[i].pBindExt = NULL;
rgBindings[i].dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
rgBindings[i].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
rgBindings[i].eParamIO = DBPARAMIO_INPUT | DBPARAMIO_OUTPUT;
rgBindings[i].cbMaxLen = 0; // ignored for fixed length types
rgBindings[i].dwFlags = 0;
rgBindings[i].wType = rgTpsEx[i].wType;
rgBindings[i].bPrecision = rgTpsEx[i].bPrec;
rgBindings[i].bScale = rgTpsEx[i].bScale;
rgBindingsWstr[i].iOrdinal = i+1;
rgBindingsWstr[i].obValue = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, t);
rgBindingsWstr[i].obLength = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, length);
rgBindingsWstr[i].obStatus = (i * sizeof(DateTimeTypeEx));
rgBindingsWstr[i].pTypeInfo = NULL;
// rgBindingsWstr[i].pObject not used
rgBindingsWstr[i].pBindExt = NULL;
rgBindingsWstr[i].dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
rgBindingsWstr[i].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
rgBindingsWstr[i].eParamIO = DBPARAMIO_NOTPARAM ;
rgBindingsWstr[i].cbMaxLen = sizeof(WCHAR)*sc_cchStrLen;
rgBindingsWstr[i].dwFlags = 0;
rgBindingsWstr[i].wType = DBTYPE_WSTR;
rgBindingsWstr[i].bPrecision = 0;
rgBindingsWstr[i].bScale = 0;
}
// Create accessors
hr = pUnkCommand->QueryInterface(IID_IAccessor, (void**)&pIAccessor);
hr = pIAccessor->CreateAccessor (DBACCESSOR_PARAMETERDATA, sc_cCol, rgBindings, 0, &hAccessor, rgStatus);
myDBPARAMS.cParamSets = 1;
myDBPARAMS.pData = rgDttEx;
myDBPARAMS.hAccessor = hAccessor;
// Set the properties on the Command object
hr = pUnkCommand->QueryInterface(IID_ICommandProperties, (void**)&pICommandProperties);
hr = pICommandProperties->SetProperties(cPropSets, rgPropSets);
// Set the text for this Command, using the default command text
// dialect. All providers that support commands must support this
// dialect and providers that support SQL must be able to recognize
// an SQL command as SQL when this dialect is specified
hr = pUnkCommand->QueryInterface(IID_ICommandText, (void**)&pICommandText);
hr = pICommandText->SetCommandText(DBGUID_DEFAULT, pwszCommandText);
// Set value in preparation for executing command
rgDttEx[0].length = sizeof(DBDATE);
rgDttEx[0].d.year = 1979;
rgDttEx[0].d.month = 4;
rgDttEx[0].d.day = 1;
rgDttEx[1].length = sizeof(DBTIME2);
rgDttEx[1].t.hour = 2;
rgDttEx[1].t.minute = 3;
rgDttEx[1].t.second = 5;
rgDttEx[1].t.fraction = 800000;
rgDttEx[2].length = sizeof(DBTIMESTAMP);
rgDttEx[2].ts.year = 1776;
rgDttEx[2].ts.month = 7;
rgDttEx[2].ts.day = 4;
rgDttEx[2].ts.hour = 21;
rgDttEx[2].ts.minute = 39;
rgDttEx[2].ts.second = 59;
rgDttEx[2].ts.fraction = 5000000;
rgDttEx[3].length = sizeof(DBTIMESTAMPOFFSET);
rgDttEx[3].tso.year = 1979;
rgDttEx[3].tso.month = 4;
rgDttEx[3].tso.day = 1;
rgDttEx[3].tso.hour = 2;
rgDttEx[3].tso.minute = 3;
rgDttEx[3].tso.second = 5;
rgDttEx[3].tso.fraction = 0;
rgDttEx[3].tso.timezone_hour = -5;
rgDttEx[3].tso.timezone_minute = 0;
// Add parameter info
hr = pUnkCommand->SetParameterInfo(sc_cParams, rgParamOrdinals, rgParamBindInfo);
// Execute the Command. User could enter a non-row returning command, so we check for
// that and return failure to prevent the display of the non-existant rowset by the caller
hr = pICommandText->Execute(NULL, IID_IRowset, &myDBPARAMS, NULL, ppUnkRowset);
if (FAILED(hr) || !*ppUnkRowset) {
printf("\nThe command executed, but did not " \
"return a rowset.\nNo rowset will be displayed.\n");
hr = E_FAIL;
// exit(0);
}
else
{
// Create accessor for rowset
hr = (*ppUnkRowset)->QueryInterface(IID_IAccessor, (void**)&pIAccessorRowset);
hr = pIAccessorRowset->CreateAccessor (DBACCESSOR_ROWDATA, sc_cCol, rgBindingsWstr, 0, &hAccessorWstr, rgStatus);
hr = ((IRowset*)*ppUnkRowset)->GetNextRows(DB_NULL_HCHAPTER, 0, sc_cRows, &cRowsObtained, &rghRow);
hr = ((IRowset*)*ppUnkRowset)->GetData(rghRow[0], hAccessorWstr, rgDttEx);
printf ("Data returned from sp_datetimetypes -------------\n%32ls%32ls%32ls%32ls\n",
rgDttEx[0].wstr, rgDttEx[1].wstr, rgDttEx[2].wstr, rgDttEx[3].wstr);
}
if (pICommandText)
pICommandText->Release();
if (pICommandProperties)
pICommandProperties->Release();
if (pIAccessor)
pIAccessor->Release();
if (pIAccessorRowset)
pIAccessorRowset->Release();
return hr;
}
HRESULT myTableDefinition (IUnknown * pUnkDataSource, DBID * pTableID, IUnknown ** ppUnkRowset) {
HRESULT hr;
ITableDefinition * pITableDefinition = NULL;
HACCESSOR hAccessor = NULL;
static const DBORDINAL sc_cCol = 4;
DBCOLUMNDESC rgColumnDescs[sc_cCol];
pTableID->eKind = DBKIND_NAME;
pTableID->uName.pwszName = L"datetimetypestable";
rgColumnDescs[0].pwszTypeName = L"date";
rgColumnDescs[0].pTypeInfo = NULL;
rgColumnDescs[0].rgPropertySets = NULL;
rgColumnDescs[0].pclsid = NULL;
rgColumnDescs[0].cPropertySets = 0;
rgColumnDescs[0].ulColumnSize = 0;
rgColumnDescs[0].dbcid.eKind = DBKIND_NAME;
rgColumnDescs[0].dbcid.uName.pwszName = L"datecol";
rgColumnDescs[0].wType = DBTYPE_DBDATE;
rgColumnDescs[0].bPrecision = 0;
rgColumnDescs[0].bScale = 0;
rgColumnDescs[1].pwszTypeName = L"time";
rgColumnDescs[1].pTypeInfo = NULL;
rgColumnDescs[1].rgPropertySets = NULL;
rgColumnDescs[1].pclsid = NULL;
rgColumnDescs[1].cPropertySets = 0;
rgColumnDescs[1].ulColumnSize = 0;
rgColumnDescs[1].dbcid.eKind = DBKIND_NAME;
rgColumnDescs[1].dbcid.uName.pwszName = L"timecol";
rgColumnDescs[1].wType = DBTYPE_DBTIME2;
rgColumnDescs[1].bPrecision = 0;
rgColumnDescs[1].bScale = 7;
rgColumnDescs[2].pwszTypeName = L"datetime2";
rgColumnDescs[2].pTypeInfo = NULL;
rgColumnDescs[2].rgPropertySets = NULL;
rgColumnDescs[2].pclsid = NULL;
rgColumnDescs[2].cPropertySets = 0;
rgColumnDescs[2].ulColumnSize = 0;
rgColumnDescs[2].dbcid.eKind = DBKIND_NAME;
rgColumnDescs[2].dbcid.uName.pwszName = L"datetime2col";
rgColumnDescs[2].wType = DBTYPE_DBTIMESTAMP;
rgColumnDescs[2].bPrecision = 0;
rgColumnDescs[2].bScale = 7;
rgColumnDescs[3].pwszTypeName = L"datetimeoffset";
rgColumnDescs[3].pTypeInfo = NULL;
rgColumnDescs[3].rgPropertySets = NULL;
rgColumnDescs[3].pclsid = NULL;
rgColumnDescs[3].cPropertySets = 0;
rgColumnDescs[3].ulColumnSize = 0;
rgColumnDescs[3].dbcid.eKind = DBKIND_NAME;
rgColumnDescs[3].dbcid.uName.pwszName = L"datetimeoffsetcol";
rgColumnDescs[3].wType = DBTYPE_DBTIMESTAMPOFFSET;
rgColumnDescs[3].bPrecision = 0;
rgColumnDescs[3].bScale = 7;
hr = pUnkDataSource->QueryInterface(IID_ITableDefinition, (void**)&pITableDefinition);
hr = pITableDefinition->CreateTable(NULL, pTableID, sc_cCol, rgColumnDescs, IID_IRowset, 0, NULL, &pTableID, ppUnkRowset);
// Ignore the case where the table already exists
if (DB_E_DUPLICATETABLEID == hr)
hr = S_OK;
if (pITableDefinition)
pITableDefinition->Release();
return hr;
}
HRESULT myTableChange(IOpenRowset * pIOpenRowset, DBID * pTableID, IUnknown ** ppUnkRowset) {
HRESULT hr;
IRowsetChange * pIRowsetChange = NULL;
IAccessor * pIAccessor = NULL;
HACCESSOR hAccessor = NULL;
HROW hRow = NULL;
static const DBCOUNTITEM sc_cCol = 4;
// Bindings and values
DateTimeTypeEx rgDttEx[sc_cCol] = {0};
DBBINDING rgBindings[sc_cCol] = {0};
DBBINDSTATUS rgStatus[sc_cCol] = {0};
TypePrecScalEx rgTpsEx[sc_cCol] = {
DBTYPE_DBDATE, 0, 0, L"DATE", sizeof(DBDATE),
DBTYPE_DBTIME2, 0, 7, L"TIME", sizeof(DBTIME2),
DBTYPE_DBTIMESTAMP, 0, 7, L"DATETIME2", sizeof(DBTIMESTAMP),
DBTYPE_DBTIMESTAMPOFFSET, 0, 7, L"DATETIMEOFFSET", sizeof(DBTIMESTAMPOFFSET)
};
// Open IRowsetChange interface on existing table
hr = pIOpenRowset->OpenRowset(NULL, pTableID, NULL, IID_IRowsetChange, 0, NULL, (IUnknown**)&pIRowsetChange);
// Prepare bindings
for (unsigned int i = 0; i < sc_cCol; i++) {
rgBindings[i].iOrdinal = i+1;
rgBindings[i].obValue = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, t);
rgBindings[i].obLength = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, length);
rgBindings[i].obStatus = (i * sizeof(DateTimeTypeEx));
rgBindings[i].pTypeInfo = NULL;
// rgBindings[i].pObject not used
rgBindings[i].pBindExt = NULL;
rgBindings[i].dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
rgBindings[i].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
rgBindings[i].eParamIO = DBPARAMIO_NOTPARAM ;
rgBindings[i].cbMaxLen = 0; // ignored for fixed length types (sizeof(DBTIMESTAMP))
rgBindings[i].dwFlags = 0;
rgBindings[i].wType = rgTpsEx[i].wType;
rgBindings[i].bPrecision = rgTpsEx[i].bPrec;
rgBindings[i].bScale = rgTpsEx[i].bScale;
}
// Create accessors
hr = pIRowsetChange->QueryInterface(IID_IAccessor, (void**)&pIAccessor);
hr = pIAccessor->CreateAccessor (DBACCESSOR_ROWDATA, sc_cCol, rgBindings, 0, &hAccessor, rgStatus);
// Set value in preparation for inserting a new row
rgDttEx[0].length = sizeof(DBDATE);
rgDttEx[0].d.year = 1979;
rgDttEx[0].d.month = 4;
rgDttEx[0].d.day = 1;
rgDttEx[1].length = sizeof(DBTIME2);
rgDttEx[1].t.hour = 2;
rgDttEx[1].t.minute = 3;
rgDttEx[1].t.second = 5;
rgDttEx[1].t.fraction = 800000;
rgDttEx[2].length = sizeof(DBTIMESTAMP);
rgDttEx[2].ts.year = 1776;
rgDttEx[2].ts.month = 7;
rgDttEx[2].ts.day = 4;
rgDttEx[2].ts.hour = 21;
rgDttEx[2].ts.minute = 39;
rgDttEx[2].ts.second = 59;
rgDttEx[2].ts.fraction = 5000000;
rgDttEx[3].length = sizeof(DBTIMESTAMPOFFSET);
rgDttEx[3].tso.year = 1979;
rgDttEx[3].tso.month = 4;
rgDttEx[3].tso.day = 1;
rgDttEx[3].tso.hour = 2;
rgDttEx[3].tso.minute = 3;
rgDttEx[3].tso.second = 5;
rgDttEx[3].tso.fraction = 0;
rgDttEx[3].tso.timezone_hour = -5;
rgDttEx[3].tso.timezone_minute = 0;
hr = pIRowsetChange->InsertRow(NULL, hAccessor, rgDttEx, &hRow);
if (pIRowsetChange)
pIRowsetChange->Release();
if (pIAccessor)
pIAccessor->Release();
return hr;
}
HRESULT myTableRead(IOpenRowset * pIOpenRowset, DBID * pTableID, IUnknown ** ppUnkRowset) {
HRESULT hr;
IRowset * pIRowset = NULL;
IAccessor * pIAccessor = NULL;
HACCESSOR hAccessor = NULL;
HACCESSOR hAccessorStr = NULL;
HACCESSOR hAccessorWstr = NULL;
static const DBROWCOUNT sc_cRows = 1;
HROW * rghRow = NULL;
DBCOUNTITEM cRowsObtained = 0;
// static const DBORDINAL sc_cCol = 4;
static const DBCOUNTITEM sc_cCol = 4;
// Bindings and values
DateTimeTypeEx rgDttEx[sc_cCol] = {0};
DBBINDING rgBindings[sc_cCol] = {0};
DBBINDSTATUS rgStatus[sc_cCol] = {0};
DBBINDING rgBindingsStr[sc_cCol] = {0};
DBBINDING rgBindingsWstr[sc_cCol] = {0};
TypePrecScalEx rgTpsEx[sc_cCol] = {
DBTYPE_DBDATE, 0, 0, L"DATE", sizeof(DBDATE),
DBTYPE_DBTIME2, 0, 0, L"TIME", sizeof(DBTIME2),
DBTYPE_DBTIMESTAMP, 0, 0, L"DATETIME2", sizeof(DBTIMESTAMP),
DBTYPE_DBTIMESTAMPOFFSET, 0, 0, L"DATETIMEOFFSET", sizeof(DBTIMESTAMPOFFSET)
};
printf ("%d = sizeof(DateTimeTypeEx)\n", sizeof(DateTimeTypeEx));
// Open IRowsetChange interface on existing table
hr = pIOpenRowset->OpenRowset(NULL, pTableID, NULL, IID_IRowset, 0, NULL, (IUnknown**)&pIRowset);
// Prepare bindings
for (unsigned int i = 0; i < 4; i++) {
rgBindings[i].iOrdinal = i+1;
rgBindingsStr[i].iOrdinal = i+1;
rgBindingsWstr[i].iOrdinal = i+1;
rgBindings[i].obValue = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, t);
rgBindings[i].obLength = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, length);
rgBindingsStr[i].obValue = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, t);
rgBindingsWstr[i].obValue = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, t);;
rgBindings[i].obLength = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, length);
rgBindingsStr[i].obLength = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, length);
rgBindingsWstr[i].obLength = (i * sizeof(DateTimeTypeEx)) + offsetof(DateTimeTypeEx, length);
rgBindings[i].obStatus = (i * sizeof(DateTimeTypeEx));
rgBindingsStr[i].obStatus = (i * sizeof(DateTimeTypeEx));
rgBindingsWstr[i].obStatus = (i * sizeof(DateTimeTypeEx));
rgBindings[i].pTypeInfo = NULL;
rgBindingsStr[i].pTypeInfo = NULL;
rgBindingsWstr[i].pTypeInfo = NULL;
// rgBindings[i].pObject not used
rgBindings[i].pBindExt = NULL;
rgBindingsStr[i].pBindExt = NULL;
rgBindingsWstr[i].pBindExt = NULL;
rgBindings[i].dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
rgBindingsStr[i].dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
rgBindingsWstr[i].dwPart = DBPART_VALUE | DBPART_LENGTH | DBPART_STATUS;
rgBindings[i].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
rgBindingsStr[i].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
rgBindingsWstr[i].dwMemOwner = DBMEMOWNER_CLIENTOWNED;
rgBindings[i].eParamIO = DBPARAMIO_NOTPARAM ;
rgBindingsStr[i].eParamIO = DBPARAMIO_NOTPARAM ;
rgBindingsWstr[i].eParamIO = DBPARAMIO_NOTPARAM ;
rgBindings[i].cbMaxLen = 0; // ignored for fixed length types
rgBindingsStr[i].cbMaxLen = sc_cchStrLen;
rgBindingsWstr[i].cbMaxLen = sizeof(WCHAR)*sc_cchStrLen;
rgBindings[i].dwFlags = 0;
rgBindingsStr[i].dwFlags = 0;
rgBindingsWstr[i].dwFlags = 0;
rgBindings[i].wType = rgTpsEx[i].wType;
rgBindingsStr[i].wType = DBTYPE_STR;
rgBindingsWstr[i].wType = DBTYPE_WSTR;
rgBindings[i].bPrecision = rgTpsEx[i].bPrec;
rgBindingsStr[i].bPrecision = 0;
rgBindingsWstr[i].bPrecision = 0;
rgBindings[i].bScale = rgTpsEx[i].bScale;
rgBindingsStr[i].bScale = 0;
rgBindingsWstr[i].bScale = 0;
}
// Create accessors
hr = pIRowset->QueryInterface(IID_IAccessor, (void**)&pIAccessor);
hr = pIAccessor->CreateAccessor (DBACCESSOR_ROWDATA, sc_cCol, rgBindings, 0, &hAccessor, rgStatus);
hr = pIAccessor->CreateAccessor (DBACCESSOR_ROWDATA, sc_cCol, rgBindingsStr, 0, &hAccessorStr, rgStatus);
hr = pIAccessor->CreateAccessor (DBACCESSOR_ROWDATA, sc_cCol, rgBindingsWstr, 0, &hAccessorWstr, rgStatus);
hr = pIRowset->GetNextRows(DB_NULL_HCHAPTER, 0, sc_cRows, &cRowsObtained, &rghRow);
hr = pIRowset->GetData(rghRow[0], hAccessor, rgDttEx);
hr = pIRowset->GetData(rghRow[0], hAccessorStr, rgDttEx);
hr = pIRowset->GetData(rghRow[0], hAccessorWstr, rgDttEx);
if (pIRowset)
pIRowset->Release();
if (pIAccessor)
pIAccessor->Release();
return hr;
}
int main() {
HRESULT hr = S_OK;
IDBInitialize * pIDBInitialize = NULL;
IDBCreateSession * pIDBCreateSession = NULL;
ISSCommandWithParameters * pIDBCreateCommand = NULL;
IOpenRowset * pIOpenRowset = NULL;
IRowset * pIRowset = NULL;
DBID tableID = {0};
hr = InitializeAndEstablishConnection((IUnknown**)&pIDBInitialize);
hr = myCreateSession((IUnknown*)pIDBInitialize, IID_IDBCreateCommand, (IUnknown**)&pIDBCreateSession);
hr = myTableDefinition(pIDBCreateSession, &tableID, (IUnknown**)&pIRowset);
hr = myCreateSession((IUnknown*)pIDBInitialize, IID_IOpenRowset, (IUnknown**)&pIOpenRowset);
hr = myTableChange(pIOpenRowset, &tableID, (IUnknown**)&pIRowset);
hr = myTableRead(pIOpenRowset, &tableID, (IUnknown**)&pIRowset);
hr = myCreateCommand((IUnknown*)pIDBCreateSession, (IUnknown**)&pIDBCreateCommand);
hr = myExecuteCommand(pIDBCreateCommand, 0, NULL, (IUnknown**)&pIRowset);
if (pIDBInitialize)
pIDBInitialize->Release();
if (pIDBCreateSession)
pIDBCreateSession->Release();
if (pIDBCreateCommand)
pIDBCreateCommand->Release();
if (pIRowset)
pIRowset->Release();
}
IF EXISTS (SELECT name FROM sysobjects WHERE name = 'sp_datetimetypes')
DROP PROCEDURE sp_datetimetypes
Comentarios
Próximamente: A lo largo de 2024 iremos eliminando gradualmente GitHub Issues como mecanismo de comentarios sobre el contenido y lo sustituiremos por un nuevo sistema de comentarios. Para más información, vea: https://aka.ms/ContentUserFeedback.
Enviar y ver comentarios de