--- parser3/src/sql/pa_sql_driver.h	2001/04/05 08:09:25	1.1
+++ parser3/src/sql/pa_sql_driver.h	2002/08/01 11:26:51	1.27
@@ -1,11 +1,8 @@
 /** @file
 	Parser: sql driver interface.
 
-	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
-
-	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
-
-	$Id: pa_sql_driver.h,v 1.1 2001/04/05 08:09:25 paf Exp $
+	Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 
 
 	driver dynamic library must look like this:
@@ -29,44 +26,72 @@
 #ifndef PA_SQL_DRIVER_H
 #define PA_SQL_DRIVER_H
 
-#include "pa_pool.h"
+static const char* IDENT_SQL_DRIVER_H="$Id: pa_sql_driver.h,v 1.27 2002/08/01 11:26:51 paf Exp $";
+
+#include <sys/types.h>
 
 /// service functions for SQL driver to use
-class Services_for_SQL_driver {
+class SQL_Driver_services {
 public:
 	/// allocates some bytes on pool
 	virtual void *malloc(size_t size) =0;
 	/// allocates some bytes clearing them with zeros
 	virtual void *calloc(size_t size) =0;
-	/// throw exception
+	/// prepare throw exception
 	virtual void _throw(const char *comment) =0;
+	/// throw C++ exception from prepared
+	virtual void propagate_exception() =0;
+public:
+	/// regretrully public, because can't make stack frames: "nowhere to return to"
+	jmp_buf mark;
 };
 
-#define SQL_DRIVER_API_VERSION 0x0300
+#define SQL_DRIVER_API_VERSION 0x0003
+#define SQL_DRIVER_CREATE create /* used in driver implementation */
+#define SQL_DRIVER_CREATE_NAME "create" /* could not figure out how to # it :( */
+
+/// events, occuring when SQL_Driver::query()-ing
+class SQL_Driver_query_event_handlers {
+public:
+	virtual void add_column(void *ptr, size_t size) =0;
+	virtual void before_rows() =0;
+	virtual void add_row() =0;
+	virtual void add_row_cell(void *ptr, size_t size) =0;
+};
 
 /// SQL driver API
 class SQL_Driver {
 public:
 
-	/// assignes services to driver. you can not use driver until this
-	void set_services(Services_for_SQL_driver *aservices) { fservices=aservices; }
-
-	SQL_Driver() :
-		fservices(0) {
-	}
 	/// get api version
 	virtual int api_version() =0;
-	/// connect. @returns true+'connection' on success. 'error' on failure
-	virtual void connect(char *url, void **connection) =0;
+	/// initialize driver by loading sql dynamic link library
+	virtual const char *initialize(char *dlopen_file_spec) =0;
+	/**	connect to sql database using 
+		@param used_only_to_connect_url 
+			format is driver specific
+			WARNING: must be used only to connect, for buffer doesn't live long enough
+
+		@returns true+'connection' on success. 'error' on failure
+	*/
+	virtual void connect(char *used_only_in_connect_url_cstr, 
+		SQL_Driver_services& services, void **connection) =0;
 	virtual void disconnect(void *connection) =0;
-	virtual void commit(void *connection) =0;
-	virtual void rollback(void *connection) =0;
-	/// log error message
-	//static void log(Pool& pool, const char *fmt, ...);
-
-protected:
-
-	Services_for_SQL_driver *fservices;
+	virtual void commit(
+		SQL_Driver_services& services, void *connection) =0;
+	virtual void rollback(
+		SQL_Driver_services& services, void *connection) =0;
+	/// @returns true to indicate that connection still alive 
+	virtual bool ping(
+		SQL_Driver_services& services, void *connection) =0;
+	/// encodes the string in 'from' to an escaped SQL string
+	virtual unsigned int quote(
+		SQL_Driver_services& services, void *connection,
+		char *to, const char *from, unsigned int length) =0;
+	virtual void query(
+		SQL_Driver_services& services, void *connection,
+		const char *statement, unsigned long offset, unsigned long limit,
+		SQL_Driver_query_event_handlers& handlers) =0;
 };
 
 typedef SQL_Driver *(*SQL_Driver_create_func)();