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/********************************************************************
* SQLSpecialColumns
*
**********************************************************************
*
* This code was created by Peter Harvey (mostly during Christmas 98/99).
* This code is LGPL. Please ensure that this message remains in future
* distributions and uses of this code (thats about all I get out of it).
* - Peter Harvey pharvey@codebydesign.com
*
********************************************************************/
#include "driver.h"
enum nSQLSpecialColumns
{
COLUMN_NAME = 1,
COL_MAX
};
m_field aSQLSpecialColumns[] =
{
"", "", 0, 0, 0,
"COLUMN_NAME", "sys", CHAR_TYPE, 50, 0
};
/* THIS IS CORRECT...
SQLRETURN SQLSpecialColumns( SQLHSTMT hDrvStmt,
SQLSMALLINT nColumnType,
SQLCHAR *szCatalogName,
SQLSMALLINT nCatalogNameLength,
SQLCHAR *szSchemaName,
SQLSMALLINT nSchemaNameLength,
SQLCHAR *szTableName,
SQLSMALLINT nTableNameLength,
SQLSMALLINT nScope,
SQLSMALLINT nNullable )
THIS WORKS... */
SQLRETURN SQLSpecialColumns( SQLHSTMT hDrvStmt,
UWORD nColumnType,
UCHAR *szCatalogName,
SWORD nCatalogNameLength,
UCHAR *szSchemaName,
SWORD nSchemaNameLength,
UCHAR *szTableName,
SWORD nTableNameLength,
UWORD nScope,
UWORD nNullable )
{
HDRVSTMT hStmt = (HDRVSTMT)hDrvStmt;
COLUMNHDR *pColumnHeader;
int nColumn;
long nCols;
long nRow;
long nCurRow;
/* SANITY CHECKS */
if( hStmt == SQL_NULL_HSTMT )
return SQL_INVALID_HANDLE;
if ( !szTableName )
return SQL_INVALID_HANDLE;
sprintf( hStmt->szSqlMsg, "hStmt = $%08lX", hStmt );
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, hStmt->szSqlMsg );
/* validate nColumnType */
switch ( nColumnType )
{
case SQL_BEST_ROWID:
break;
case SQL_ROWVER:
default:
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, "SQL_ERROR This function not supported" );
return SQL_ERROR;
}
/* validate nScope */
switch ( nScope )
{
case SQL_SCOPE_CURROW:
case SQL_SCOPE_TRANSACTION:
case SQL_SCOPE_SESSION:
break;
default:
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, "SQL_ERROR This function not supported" );
return SQL_ERROR;
}
/* validate nNullable */
switch ( nNullable )
{
case SQL_NO_NULLS:
case SQL_NULLABLE:
break;
default:
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, "SQL_ERROR This function not supported" );
return SQL_ERROR;
}
/* only one scenario supported: nColumnType=SQL_BEST_ROWID and nScope=ignored nNullable=ignored */
/**************************
* close any existing result
**************************/
if ( hStmt->hStmtExtras->aResults )
_FreeResults( hStmt->hStmtExtras );
if ( hStmt->pszQuery != NULL )
free( hStmt->pszQuery );
hStmt->pszQuery = NULL;
/**************************
* allocate memory for columns headers and result data (row 0 is column header while col 0 is reserved for bookmarks)
**************************/
hStmt->hStmtExtras->nCols = COL_MAX-1;
hStmt->hStmtExtras->nRows = 1;
hStmt->hStmtExtras->nRow = 0;
hStmt->hStmtExtras->aResults = malloc( sizeof(char*) * (hStmt->hStmtExtras->nRows+1) * (hStmt->hStmtExtras->nCols+1) );
memset( hStmt->hStmtExtras->aResults, 0, sizeof(char*) * (hStmt->hStmtExtras->nRows+1) * (hStmt->hStmtExtras->nCols+1) );
if ( hStmt->hStmtExtras->aResults == NULL )
{
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_WARNING, LOG_WARNING, "Not enough memory. (malloc failed)" );
hStmt->hStmtExtras->nRows = 0;
hStmt->hStmtExtras->nCols = 0;
return SQL_ERROR;
}
/**************************
* gather column header information (save col 0 for bookmarks)
**************************/
for ( nColumn = 1; nColumn < COL_MAX; nColumn++ )
{
(hStmt->hStmtExtras->aResults)[nColumn] = malloc( sizeof(COLUMNHDR) );
pColumnHeader = (COLUMNHDR*)(hStmt->hStmtExtras->aResults)[nColumn];
memset( pColumnHeader, 0, sizeof(COLUMNHDR) );
_NativeToSQLColumnHeader( pColumnHeader, &(aSQLSpecialColumns[nColumn]) );
}
/************************
* gather data (save col 0 for bookmarks and factor out index columns)
************************/
nCols = hStmt->hStmtExtras->nCols;
hStmt->hStmtExtras->nRow = 0;
nCurRow = 1;
hStmt->hStmtExtras->nRow++;
nRow = hStmt->hStmtExtras->nRow;
for ( nColumn = 1; nColumn < COL_MAX; nColumn++ )
{
switch ( nColumn )
{
case COLUMN_NAME:
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = (char*)strdup( "_rowid" );
break;
default:
(hStmt->hStmtExtras->aResults)[nRow*nCols+nColumn] = NULL;
} /* switch nColumn */
} /* for nColumn */
hStmt->hStmtExtras->nRow = 0;
logPushMsg( hStmt->hLog, __FILE__, __FILE__, __LINE__, LOG_INFO, LOG_INFO, "SQL_SUCCESS" );
return SQL_SUCCESS;
}
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