Attributes et Name, propriétés – Exemple (VC++)

S’applique à : Access 2013, Office 2013

Cet exemple affiche la valeur de la propriété Attributes des objets Connection, Field et Property. Il utilise la propriété Name pour afficher le nom de chaque objet Field et Property.

 
// BeginAttributesCpp 
#import "C:\Program Files\Common Files\System\ADO\msado15.dll" no_namespace rename("EOF", "EndOfFile") 
 
#include <ole2.h> 
#include <stdio.h> 
#include <conio.h> 
 
// Function declarations 
inline void TESTHR(HRESULT x) {if FAILED(x) _com_issue_error(x);}; 
void AttributesX(); 
void PrintProviderError(_ConnectionPtr pConnection); 
void PrintComError(_com_error &e); 
 
/////////////////////////////////////////////////////////// 
// // 
// Main Function // 
// // 
/////////////////////////////////////////////////////////// 
 
void main() 
{ 
 if(FAILED(::CoInitialize(NULL))) 
 return; 
 
 AttributesX(); 
 
 //Wait here for user to see the output.. 
 printf("\nPress any key to continue..."); 
 getch(); 
 
 ::CoUninitialize(); 
} 
 
 
/////////////////////////////////////////////////////////// 
// // 
// AttributesX Function // 
// // 
/////////////////////////////////////////////////////////// 
 
void AttributesX() 
{ 
 // Define ADO object pointers. 
 // Initialize pointers on define. 
 // These are in the ADODB:: namespace 
 _RecordsetPtr pRstEmployee = NULL; 
 _ConnectionPtr pConnection = NULL; 
 FieldsPtr fldLoop = NULL; 
 PropertiesPtr proLoop = NULL; 
 
 //Define Other Variables 
 HRESULT hr = S_OK; 
 _variant_t Index; 
 Index.vt = VT_I2; 
 int j=0; 
 //Open a recordset using a Client Cursor 
 //For the Employee Table 
 _bstr_t strCnn("Provider='sqloledb';Data Source='MySqlServer';" 
 "Initial Catalog='pubs';Integrated Security='SSPI';"); 
 
 try 
 { 
 // open connection and record set 
 TESTHR(pConnection.CreateInstance(__uuidof(Connection))); 
 pConnection->Open(strCnn,"","",adConnectUnspecified); 
 
 TESTHR(pRstEmployee.CreateInstance(__uuidof(Recordset))); 
 pRstEmployee->Open("Employee", _variant_t((IDispatch *)pConnection,true), adOpenForwardOnly, 
 adLockReadOnly, adCmdTable); 
 
 // Display the attributes of Connection. 
 printf("Connection attributes: %d \n", pConnection->Attributes); 
 
 // Display the attribute of the employee table's 
 //fields 
 printf("\nFields attributes:\n"); 
 fldLoop = pRstEmployee->GetFields(); 
 
 for (int i = 0; i < (int)fldLoop->GetCount(); i++) 
 { 
 Index.iVal=i; 
 printf (" %s = %d \n",(LPSTR)fldLoop->GetItem(Index)->GetName(), 
 (int)fldLoop->GetItem(Index)->GetAttributes()); 
 } 
 
 // Display Fields of the Employee table which are NULLBALE 
 printf("\nNULLABLE Fields :"); 
 
 for (int i1 = 0; i1 < (int)fldLoop->GetCount(); i1++) 
 { 
 Index.iVal = i1; 
 
 if (fldLoop->GetItem(Index)->GetAttributes() & adFldIsNullable) 
 { 
 printf ("%s \n", (LPSTR)fldLoop->GetItem(Index)->GetName()); 
 } 
 } 
 
 // Display the attributes of the Employee tables's 
 // properties 
 printf("\nProperty attributes:\n"); 
 proLoop = pRstEmployee->GetProperties(); 
 
 for (int i2 = 0; i2 < (int)proLoop->GetCount(); i2++) 
 { 
 j= j+1; 
 Index.iVal=i2; 
 printf (" %s = %d \n", (LPSTR)(_bstr_t)proLoop->GetItem(Index)->GetName() 
 ,(int)proLoop->GetItem(Index)->GetAttributes()); 
 
 if (((j % 23) == 0) || ( i2==6)) 
 { 
 printf("\nPress any key to continue..."); 
 getch(); 
 
 //Clear the screen for the next display 
 system("cls"); 
 j=0; 
 } 
 
 } 
 } 
 catch(_com_error &e) 
 { 
 // Notify the user of errors if any. 
 
 PrintProviderError(pConnection); 
 PrintComError(e); 
 } 
 
 // Clean up objects before exit. 
 if (pRstEmployee) 
 if (pRstEmployee->State == adStateOpen) 
 pRstEmployee->Close(); 
 if (pConnection) 
 if (pConnection->State == adStateOpen) 
 pConnection->Close(); 
} 
 
 
/////////////////////////////////////////////////////////// 
// // 
// PrintProviderError Function // 
// // 
/////////////////////////////////////////////////////////// 
 
void PrintProviderError(_ConnectionPtr pConnection) 
{ 
 // Print Provider Errors from Connection object. 
 
 // pErr is a record object in the Connection's Error collection. 
 ErrorPtr pErr = NULL; 
 long nCount = 0; 
 long i = 0; 
 
 if( (pConnection->Errors->Count) > 0) 
 { 
 nCount = pConnection->Errors->Count; 
 
 // Collection ranges from 0 to nCount -1. 
 for(i = 0; i < nCount; i++) 
 { 
 pErr = pConnection->Errors->GetItem(i); 
 printf("\t Error number: %x\t%s", (LPCSTR) pErr->Number, (LPCSTR) pErr->Description); 
 } 
 } 
} 
 
/////////////////////////////////////////////////////////// 
// // 
// PrintComError Function // 
// // 
/////////////////////////////////////////////////////////// 
 
VOID PrintComError(_com_error &e) 
{ 
 _bstr_t bstrSource(e.Source()); 
 _bstr_t bstrDescription(e.Description()); 
 
 // Print Com errors. 
 printf("\nError\n"); 
 printf("Code = %08lx\n", e.Error()); 
 printf("Code meaning = %s\n", e.ErrorMessage()); 
 printf("Source = %s\n", (LPCSTR) bstrSource); 
 printf("Description = %s\n", (LPCSTR) bstrDescription); 
} 
// EndAttributesCpp 

AttributesX.h

 
// BeginAttributesH 
#include "icrsint.h" 
 
//This class extracts LastName, FirstName, FaxPhone from Employees table 
 
class CEmployeeRs : public CADORecordBinding 
{ 
BEGIN_ADO_BINDING(CEmployeeRs) 
 
 // Column LastName is the 2nd field in the table 
 ADO_VARIABLE_LENGTH_ENTRY2(2,adVarChar,m_szemp_LastName, 
 sizeof(m_szemp_LastName),lemp_LastNameStatus,TRUE) 
 
 // Column FirstName is the 17th field in the table 
 ADO_VARIABLE_LENGTH_ENTRY2(17,adVarChar,m_szemp_FirstName, 
 sizeof(m_szemp_FirstName),lemp_FirstNameStatus,TRUE) 
 
 // Column FaxPhone is the 18th field in the table 
 ADO_VARIABLE_LENGTH_ENTRY2(18,adVarChar,m_szemp_Faxphone, 
 sizeof(m_szemp_Faxphone),lemp_FaxphoneStatus,TRUE) 
 
END_ADO_BINDING() 
 
public: 
 CHAR m_szemp_LastName[21]; 
 ULONG lemp_LastNameStatus; 
 CHAR m_szemp_FirstName[11]; 
 ULONG lemp_FirstNameStatus; 
 CHAR m_szemp_Faxphone[25]; 
 ULONG lemp_FaxphoneStatus; 
}; 
 
// EndAttributesH