为什么我的代码不适用于较旧的访问驱动程序？

why doesn't my code work with older access drivers?

本文关键字：访问 驱动程序 我的 代码 不适用 适用于 为什么      更新时间：2023-10-16
// SQLTables.cpp
// compile with: user32.lib odbc32.lib
#include <windows.h>
#include <sqlext.h>
#include <stdio.h>
// simple helper functions
int MySQLSuccess(SQLRETURN rc) {
   return (rc == SQL_SUCCESS || rc == SQL_SUCCESS_WITH_INFO);
}
struct DataBinding {
   SQLSMALLINT TargetType;
   SQLPOINTER TargetValuePtr;
   SQLINTEGER BufferLength;
   SQLLEN StrLen_or_Ind;
};
void printCatalog(const struct DataBinding* catalogResult, int numCols) {
    for(int i = 0; i < numCols; i++)
       if (catalogResult[i].StrLen_or_Ind != SQL_NULL_DATA) 
          printf("Catalog Name(%d) = %s t", i + 1, (char *)catalogResult[i].TargetValuePtr);
    printf("n");
}
// remember to disconnect and free memory, and free statements and handles
int main() {
   int bufferSize = 1024, i, numCols = 18;
   struct DataBinding* catalogResult = (struct DataBinding*) malloc( numCols * sizeof(struct DataBinding) );
   wchar_t* dbName = (wchar_t *)malloc( sizeof(wchar_t)*bufferSize );
   wchar_t* userName = (wchar_t *)malloc( sizeof(wchar_t)*bufferSize );
   // declare and initialize the environment, connection, statement handles
   SQLHENV henv = NULL;   // Environment   
   SQLHDBC hdbc = NULL;   // Connection handle
   SQLHSTMT hstmt = NULL;   // Statement handle
   SQLRETURN retCode;
   HWND desktopHandle = GetDesktopWindow();   // desktop's window handle
   SQLWCHAR connStrbuffer[1024];
   SQLSMALLINT connStrBufferLen;
   retCode = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);
   retCode = SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, -6);
   retCode = SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);
   //retCode = SQLSetConnectAttr(hdbc, SQL_LOGIN_TIMEOUT, (SQLPOINTER)10, 0);
   //retCode = SQLSetConnectAttr(hdbc,fOption,(SQLPOINTER)(size_t)param,0);
   //retCode = SQLDriverConnect(hdbc, desktopHandle, (SQLCHAR*)"DSN=footballDB1;UID="";PWD=""", SQL_NTS, (SQLCHAR*)connStrbuffer, 1024 + 1, &connStrBufferLen, SQL_DRIVER_NOPROMPT);
   retCode = SQLDriverConnect(hdbc, desktopHandle, (SQLCHAR*)"DSN=footballDB;UID="";PWD=""", SQL_NTS, (SQLCHAR*)connStrbuffer, 1024 + 1, &connStrBufferLen, SQL_DRIVER_NOPROMPT);
   retCode = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
   retCode = SQLGetInfo(hdbc, SQL_DBMS_NAME , dbName, (SQLSMALLINT)bufferSize, (SQLSMALLINT *)&bufferSize);
   printf("%sn", dbName);
   retCode = SQLGetInfo(hdbc, SQL_USER_NAME, userName, (SQLSMALLINT)bufferSize, (SQLSMALLINT *)&bufferSize);
   bufferSize = 1024;
   // allocate memory for the binding
   // free this memory when done
   for ( i = 0 ; i < numCols ; i++ ) {
      catalogResult[i].TargetType = SQL_C_CHAR;
      catalogResult[i].BufferLength = (bufferSize + 1);
      catalogResult[i].TargetValuePtr = malloc( sizeof(unsigned char)*catalogResult[i].BufferLength );
   }
   // setup the binding (can be used even if the statement is closed by closeStatementHandle)
   for ( i = 0 ; i < numCols ; i++ )
      retCode = SQLBindCol(hstmt, (SQLUSMALLINT)i + 1, catalogResult[i].TargetType, catalogResult[i].TargetValuePtr, catalogResult[i].BufferLength, &(catalogResult[i].StrLen_or_Ind));
   // all catalogs query
   printf( "A list of names of all catalogsn" );
   //retCode = SQLTables( hstmt, (SQLCHAR*)"%", SQL_NTS, (SQLCHAR*)NULL, SQL_NTS, (SQLCHAR*)NULL, SQL_NTS, (SQLCHAR*)NULL, SQL_NTS );   
   retCode = SQLTables( hstmt, (unsigned char*)NULL, SQL_NTS, (unsigned char*)NULL, SQL_NTS, (unsigned char*)NULL, SQL_NTS, (unsigned char*)"'VIEW','TABLE'", SQL_NTS );
   //retCode = SQLTables( hstmt, (SQLCHAR*)NULL, 0, (SQLCHAR*)"schema1", SQL_NTS, (SQLCHAR*)"", SQL_NTS, (SQLCHAR*)"'VIEW','TABLE'", SQL_NTS );
   //retCode = SQLTables( hstmt, (SQLCHAR*)"", SQL_NTS, (SQLCHAR*)"%", SQL_NTS, (SQLCHAR*)"test", SQL_NTS);
   //retCode = SQLColumns(hstmt, (SQLCHAR*)NULL, 0, (SQLCHAR*)NULL, SQL_NTS, (SQLCHAR*)"test", SQL_NTS, (SQLCHAR*)NULL, 0);
   //retCode = SQLColumns(hstmt, (SQLCHAR*)NULL, 0, (SQLCHAR*)NULL, SQL_NTS, (SQLCHAR*)"CLAIMS_HISTORY_1", SQL_NTS, (SQLCHAR*)NULL, 0);
   printf( "retCode = %d:%dn", retCode, SQL_SUCCESS);   
   for ( retCode = SQLFetch(hstmt) ;  MySQLSuccess(retCode) ; retCode = SQLFetch(hstmt) )
      printCatalog( catalogResult, numCols );
   getchar();
}

这段代码应该返回数据库中的表名，并适用于使用 *.accdb（即 Microsoft 驱动程序）扩展名保存的访问数据库，我猜这是最新的驱动程序之一，但我无法弄清楚为什么它不适用于驱动程序做Microsoft访问 （*.mdb）。 谁能告诉我为什么会发生这种情况？

这是使用最新驱动程序创建 DSN 时的示例输出。

ACCESS
A list of names of all catalogs
retCode = 0:0
Catalog Name(1) = C:Usersakisho02DesktopNew folder (4)football club db2.acc
db      Catalog Name(3) = db_clubs      Catalog Name(4) = TABLE         Catalog
≡¡║ε½½½½½½½½■ε■ε■ε■     Catalog Name(18) =
Catalog Name(1) = C:Usersakisho02DesktopNew folder (4)football club db2.acc
db      Catalog Name(3) = db_items      Catalog Name(4) = TABLE         Catalog
≡¡║ε½½½½½½½½■ε■ε■ε■     Catalog Name(18) =
Catalog Name(1) = C:Usersakisho02DesktopNew folder (4)football club db2.acc
db      Catalog Name(3) = db_REGION     Catalog Name(4) = TABLE         Catalog

这是我使用早期驱动程序创建DSN时的示例输出

ACCESS
A list of names of all catalogs
retCode = 0:0
Catalog Name(1) = C:Usersakisho02Desktopfootball club db    Catalog Name(3)
≡¡║ε½½½½½½½½■ε■ε■ε■     Catalog Name(18) =      Catalog Name(6) =
Catalog Name(1) = C:Usersakisho02Desktopfootball club db    Catalog Name(3)
≡¡║ε½½½½½½½½■ε■ε■ε■     Catalog Name(18) =      Catalog Name(6) =
Catalog Name(1) = C:Usersakisho02Desktopfootball club db    Catalog Name(3)
≡¡║ε½½½½½½½½■ε■ε■ε■     Catalog Name(18) =      Catalog Name(6) =

这是我在Microsoft Access driviers中看到的一个错误。我建议您在设置数据库连接时使用系统提供的最新版本。

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