fixes

[wxWidgets.git] / src / iodbc / hdbc.h

#ifndef	_HDBC_H
#define	_HDBC_H

typedef	struct DBC
{
	int	type;		/* must be 1st field */
	struct DBC FAR*	
		next;

	HENV	genv;		/* back point to global env object */

	HDBC	dhdbc;		/* driver's private dbc */
	HENV	henv;		/* back point to instant env object */
	HSTMT	hstmt;		/* list of statement object handle(s) */
	HERR	herr;

	int	state;

	/* options */
	UDWORD	access_mode;
	UDWORD	autocommit;

	UDWORD	login_timeout;
	UDWORD	odbc_cursors;
	UDWORD	packet_size;
	UDWORD	quiet_mode;
	UDWORD	txn_isolation;
	SWORD	cb_commit;
	SWORD	cb_rollback;

	char FAR*	
		current_qualifier;

	int	trace;	/* trace flag */
	char FAR*	
		tfile;
	void FAR*
		tstm;	/* trace stream */
} DBC_t;

/* 
 * Note:
 *  - ODBC applications can see address of driver manager's 
 *    connection object, i.e connection handle -- a void pointer, 
 *    but not detail of it. ODBC applications can neither see 
 *    detail driver's connection object nor its address.
 *
 *  - ODBC driver manager knows its own connection objects and
 *    exposes their address to an ODBC application. Driver manager
 *    also knows address of driver's connection objects and keeps
 *    it via dhdbc field in driver manager's connection object.
 * 
 *  - ODBC driver exposes address of its own connection object to
 *    driver manager without detail.
 *
 *  - Applications can get driver's connection object handle by
 *    SQLGetInfo() with fInfoType equals to SQL_DRIVER_HDBC.
 */

enum	{
	en_dbc_allocated,
	en_dbc_needdata,
	en_dbc_connected,
	en_dbc_hstmt
};

#endif