--- parser3/src/sql/pa_sql_driver.h	2001/11/05 11:46:29	1.20
+++ parser3/src/sql/pa_sql_driver.h	2003/01/21 15:51:16	1.34
@@ -1,10 +1,8 @@
 /** @file
 	Parser: sql driver interface.
 
-	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
-	Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
-
-	$Id: pa_sql_driver.h,v 1.20 2001/11/05 11:46:29 paf Exp $
+	Copyright (c) 2001, 2003 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 
 
 	driver dynamic library must look like this:
@@ -28,8 +26,50 @@
 #ifndef PA_SQL_DRIVER_H
 #define PA_SQL_DRIVER_H
 
+static const char* IDENT_SQL_DRIVER_H="$Date: 2003/01/21 15:51:16 $";
+
 #include <sys/types.h>
 
+#define SQL_DRIVER_API_VERSION 0x0005
+#define SQL_DRIVER_CREATE create /* used in driver implementation */
+#define SQL_DRIVER_CREATE_NAME "create" /* could not figure out how to # it :( */
+
+/// fields are freed elsewhere
+class SQL_Error {
+	bool fdefined;
+	const char *ftype;
+	const void *fproblem_source;
+	const char *fcomment;
+public:
+	SQL_Error():
+		fdefined(false) {}
+	SQL_Error(
+		const char *atype,
+		const void *aproblem_source, 
+		const char *acomment):
+		fdefined(true),
+		ftype(atype),
+		fproblem_source(aproblem_source),
+		fcomment(acomment) {}
+	SQL_Error(const char *acomment):
+		fdefined(true),
+		ftype(0),
+		fproblem_source(0),
+		fcomment(acomment) {}
+	SQL_Error& operator =(const SQL_Error& src) {
+		fdefined=src.fdefined;
+		ftype=src.ftype;
+		fproblem_source=src.fproblem_source;
+		fcomment=src.fcomment;
+		return *this;
+	}
+
+	bool defined() const { return fdefined; }
+	const char *type() const { return ftype; }
+	const void *problem_source() const { return fproblem_source; }
+	const char *comment() const { return fcomment; }
+};
+
 /// service functions for SQL driver to use
 class SQL_Driver_services {
 public:
@@ -38,36 +78,37 @@ public:
 	/// allocates some bytes clearing them with zeros
 	virtual void *calloc(size_t size) =0;
 	/// prepare throw exception
-	virtual void _throw(const char *comment) =0;
+	virtual void _throw(const SQL_Error& e) =0;
 	/// throw C++ exception from prepared
 	virtual void propagate_exception() =0;
+	/// helper func
+	void _throw(const char *comment) { _throw(SQL_Error("sql.connect", 0, comment)); }
 public:
 	/// regretrully public, because can't make stack frames: "nowhere to return to"
 	jmp_buf mark;
 };
 
-#define SQL_DRIVER_API_VERSION 0x0100
-#define SQL_DRIVER_CREATE create
-#define SQL_DRIVER_CREATE_NAME "create" /* could not figure out how to # it :( */
+/** events, occuring when SQL_Driver::query()-ing. 
 
-/// events, occuring when SQL_Driver::query()-ing
+		when OK must return false.
+		must NOT throw exceptions, must store them to error & return true.
+*/
 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;
+	virtual bool add_column(SQL_Error& error, void *ptr, size_t size) =0;
+	virtual bool before_rows(SQL_Error& error) =0;
+	virtual bool add_row(SQL_Error& error) =0;
+	virtual bool add_row_cell(SQL_Error& error, void *ptr, size_t size) =0;
 };
 
 /// SQL driver API
 class SQL_Driver {
 public:
 
-	SQL_Driver() {}
 	/// get api version
 	virtual int api_version() =0;
 	/// initialize driver by loading sql dynamic link library
-	virtual const char *initialize(const char *dlopen_file_spec) =0;
+	virtual const char *initialize(char *dlopen_file_spec) =0;
 	/**	connect to sql database using 
 		@param used_only_to_connect_url 
 			format is driver specific