IM001 Driver does not support this function (ODBC) - sql

Question

I'm building custom ODBC driver.
my main method:
int main(int argc, char** argv) {
SQLRETURN status;
//SQLHANDLE hEnv;
//SQLHANDLE hStmt;
SQLHENV hEnv;
SQLHDBC dbc = 0;
SQLHSTMT hStmt;
SQLCHAR ConnStrOut[1024];
SQLSMALLINT x;
// startup banner
//printf();
MessageBox(GetDesktopWindow(), "ODBC Client\n\n", "Driver", MB_OK);
// show query to be executed
printf("Query: %s\n", "SELECT VISITS FROM TRAFFIC");
// allocate ENVIRONMENT
status = SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &hEnv);
// check for error
ODBC_CHK_ERROR(SQL_HANDLE_ENV, hEnv, status, "");
// set the ODBC version for behaviour expected
status = SQLSetEnvAttr(hEnv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER) SQL_OV_ODBC3, 0);
CHECK_STATUS(status, (UCHAR*)"SQLSetEnvAttr", hEnv, SQL_HANDLE_ENV);
// check for error
ODBC_CHK_ERROR(SQL_HANDLE_ENV, hEnv, status, "");
// allocate CONNECTION
status = SQLAllocHandle(SQL_HANDLE_DBC, hEnv, &dbc);
// check for error
ODBC_CHK_ERROR(SQL_HANDLE_ENV, hEnv, status, "");
// ----------- real connection takes place at this point
status = SQLDriverConnect(dbc, GetDesktopWindow(),
(unsigned char*) "DSN=myDSN",
SQL_NTS, ConnStrOut, 1024, &x,
SQL_DRIVER_PROMPT);
if (SQL_SUCCEEDED(status)) {
printf("Connected\n");
printf("Returned connection string was:\n\t%s\n", ConnStrOut);
//SQLDisconnect(dbc);
}
Everything works well when I run main using my sample client.
However, when I try odbc testing tool odbcte32 or other odbc client(s) such as SqlDbx or QTODBC, once I try to establish connection using 'myDSN' (which is using my custom driver) I always get: [Microsoft][ODBC Driver Manager] Driver does not support this function
I've properly implemented SQLDriverConnect function to create OutConnectionString by reading key-value-pairs from User DSN that uses my compiled driver DLL.
I've defined skeletons for all odbc functions http://msdn.microsoft.com/en-us/library/windows/desktop/ms714562(v=vs.85).aspx
I compile my custom diver using minGW compiler (32-bit).
I have Windows 7 OS 64-bit but I'm running 32-bit ODBC test tool.
This is driving me crazy. I don't understand which specific function is not supported in my driver. Again, I have created skeletons for all needed functions. Here's the list:
SQLAllocConnect ,
SQLAllocEnv ,
SQLAllocStmt ,
SQLAllocHandle ,
SQLFreeConnect ,
SQLFreeEnv ,
SQLFreeStmt ,
SQLBindCol ,
SQLCancel ,
SQLConnect ,
SQLDescribeCol ,
SQLDisconnect ,
SQLExecDirect ,
SQLExecute ,
SQLExtendedFetch ,
SQLFetch ,
SQLGetCursorName ,
SQLNumResultCols ,
SQLPrepare ,
SQLRowCount ,
SQLSetCursorName ,
SQLColumns ,
SQLDriverConnect ,
SQLGetData ,
SQLGetInfo ,
SQLGetTypeInfo ,
SQLParamData ,
SQLPutData ,
SQLStatistics ,
SQLTables ,
SQLBrowseConnect ,
SQLColumnPrivileg,
SQLDescribeParam ,
SQLForeignKeys ,
SQLMoreResults ,
SQLNativeSql ,
SQLNumParams ,
SQLPrimaryKeys ,
SQLProcedureColum,
SQLProcedures ,
SQLSetPos ,
SQLTablePrivilege,
SQLBindParameter ,
SQLCloseCursor ,
SQLColAttribute ,
SQLCopyDesc ,
SQLEndTran ,
SQLFetchScroll ,
SQLFreeHandle ,
SQLGetConnectAttr,
SQLGetDescField ,
SQLGetDescRec ,
SQLGetDiagField ,
SQLGetDiagRec ,
SQLGetEnvAttr ,
SQLGetStmtAttr ,
SQLSetConnectAttr,
SQLSetDescField ,
SQLSetDescRec ,
SQLSetEnvAttr ,
SQLSetStmtAttr ,
SQLBulkOperations,
SQLSpecialColumns.
EDIT:
Figured it out. SQLDisconnect was defined incorrectly. Make sure all parameters that are passed are correct.
The right definition was:
RETCODE SQL_API SQLDisconnect(SQLHDBC pHandle) {
__CHK_HANDLE(pHandle, SQL_HANDLE_DBC, SQL_ERROR);
_SQLFreeDiag(_DIAGCONN(pHandle));
_SQLDisconnect((PGENODBCCONN) pHandle);
return (SQL_SUCCESS);
}
The way I figured it out:
create .def file (name it the same as your driver DLL file name, i.e. in my case it was axodbc.def), list all functions present in your driver in it, as following:
LIBRARY axodbc
DESCRIPTION "Driver 1 definitions"
EXPORTS
SQLAllocConnect
SQLAllocEnv
SQLAllocStmt
SQLAllocHandle
SQLFreeConnect
SQLFreeEnv
SQLFreeStmt
SQLBindCol
SQLCancel
SQLConnect
SQLDescribeCol
SQLExecDirect
SQLExecute
SQLDisconnect
SQLExtendedFetch
SQLFetch
SQLGetCursorName
SQLNumResultCols
SQLPrepare
SQLRowCount
SQLSetCursorName
SQLColumns
SQLDriverConnect
SQLGetData
SQLGetInfo
SQLGetTypeInfo
SQLParamData
SQLPutData
SQLStatistics
SQLTables
SQLBrowseConnect
SQLColumnPrivileges
SQLDescribeParam
SQLForeignKeys
SQLMoreResults
SQLNativeSql
SQLNumParams
SQLPrimaryKeys
SQLProcedureColumns
SQLProcedures
SQLSetPos
SQLTablePrivileges
SQLBindParameter
SQLCloseCursor
SQLColAttribute
SQLCopyDesc
SQLEndTran
SQLFetchScroll
SQLFreeHandle
SQLGetConnectAttr
SQLGetDescField
SQLGetDescRec
SQLGetDiagField
SQLGetDiagRec
SQLGetEnvAttr
SQLGetStmtAttr
SQLSetConnectAttr
SQLSetDescField
SQLSetDescRec
SQLSetEnvAttr
SQLSetStmtAttr
SQLBulkOperations
SQLSpecialColumns
Compile DLL (using mingw (g++)) and include your .def file, something like:
g++ -shared -o axodbc.dll axodbc.cpp connectionmanager.cpp diagnostics.cpp myresources.res axodbc.def -lodbc32 -lodbccp32
Compiler gave me an error at this point that SQLDisconnect was defined incorrectly

Answer 1

I don't SQLGetFunctions in that list. You can always enable ODBC tracing in the driver manager and it will show what ODBC calls are made and what the result was.