/*************************************************************************
*									 *
*	 YAP Prolog 							 *
*									 *
*	Yap Prolog was developed at NCCUP - Universidade do Porto	 *
*									 *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997	 *
*									 *
**************************************************************************
*									 *
* File:		myddas_mysql.yap					 *
* Last rev:								 *
* mods:									 *
* comments:	MySQL Predicates                 			 *
*									 *
*************************************************************************/
#ifdef sqlite3
#undef sqlite3
#define DBMS(x) sqlite3_##x
#define c_DBMS(x) c_sqlite3_##x
#define NAME() 'libYapsqlite3'
#define MODULE() myddas_sqlite3
#define INIT() init_sqlite3
#elif defined( odbc )
#undef odbc
#define DBMS(x) odbc_##x
#define c_DBMS(x) c_odbc_##x
#define NAME() 'libYapodbc'
#define MODULE() myddas_odbc
#define INIT() init_odbc
#elif defined( postgres )
#undef postgres
#define DBMS(x) postgres_##x
#define c_DBMS(x) c_postgres_##x
#define NAME() 'libYappostgres'
#define MODULE() myddas_postgres
#define INIT() init_odbc
#endif

#if defined(DBMS)

:- module(MODULE(),[
			  c_DBMS(change_database)/2,
			  c_DBMS(connect)/4,
			  c_DBMS(disconnect)/1,
			  c_DBMS(get_attributes_types)/3,
			  c_DBMS(get_database)/2,
			  c_DBMS(get_fields_properties)/3,
			  c_DBMS(get_next_result_set)/3,
			  c_DBMS(query)/5,
			  c_DBMS(number_of_fields)/3,
              DBMS(describe)/3,
              DBMS(show_tables)/2,
              DBMS(row)/3
			 ]).

:- use_module(myddas,[
		      db_sql/3
		     ]).

:- use_module(myddas_errors,[
			     '$error_checks'/1
			    ]).

:- use_module(myddas_util_predicates,[
				      '$get_value'/2,
				      '$make_atom'/2,
				      '$make_atom_args'/2,
				      '$make_a_list'/2,
				      '$write_or_not'/1
				     ]).
:- load_foreign_files( [NAME()], [], INIT()).

%--------------------------------------------------------
% Public Predicates
%--------------------------------------------------------


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(result_set)/1
%
%
DBMS(result_set)(X):-
	var(X),!,
	get_value(DBMS(result_set),X).
DBMS(result_set)(use_result):-
	set_value(DBMS(result_set),use_result).
DBMS(result_set)(store_result):-
	set_value(DBMS(result_set),store_result).
%default value
:- DBMS(result_set)(use_result).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(db_datalog_describe)/2
%
%
DBMS(datalog_describe)(Relation):-
	DBMS(datalog_describe)(myddas,Relation).
DBMS(datalog_describe)(Connection,Relation) :-
	'$error_checks'(DBMS(datalog_describe)(Relation,Connection)),
	'$get_value'(Connection,Conn),
	'$make_atom'(['DESCRIBE ',Relation],SQL),
	DBMS(result_set)(Mode),
	c_DBMS(query)(SQL,ResultSet,Conn,Mode,_),
	c_DBMS(table_write)(ResultSet).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(describe)/3
% gives the results of the DESCRIBE statement
% by backtracking
%#if sqlite3
DBMS(describe)(Connection,Relation,tableinfo(FieldID,Type,Null,Primary,Default,'')) :-
	'$get_value'(Connection,Conn),
	'$make_atom'(['PRAGMA table_info(\'',Relation,'\')'],SQL),
	DBMS(result_set)(Mode),
	'$write_or_not'(SQL),
	c_DBMS(query)(SQL,ResultSet,Conn,Mode,_),
	!,
	DBMS(row)(ResultSet,6,[_A1,FieldID,Type,Null,Default,Primary]).
%#endif
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(datalog_show_tables)/1
%
%
DBMS(datalog_show_tables):-
	DBMS(datalog_show_tables)(myddas).
DBMS(datalog_show_tables)(Connection) :-
	'$get_value'(Connection,Conn),
	DBMS(result_set)(Mode),
	'$write_or_not'('.tables'),
	c_DBMS(query)('.tables',ResultSet,Conn,Mode,_),
	c_DBMS(table_write)(ResultSet).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(show_tables)/2
% gives the results of the SHOW TABLES statement
% by backtracking
%#if sqlite3
DBMS(show_tables)(Connection,table(Table)) :-
	'$get_value'(Connection,Conn),
	SQL = 'SELECT name FROM sqlite_master WHERE type=\'table\' ORDER BY name',
	DBMS(result_set)(Mode),
	'$write_or_not'(SQL),
	c_DBMS(query)(SQL,ResultSet,Conn,Mode,_),
	!,
	DBMS(row)(ResultSet,1,[Table]).
%#endif
	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(show_database)/2
%
%
DBMS(show_database)(Connection,Database) :-
	'$error_checks'(DBMS(show_database)(Connection,Database)),
	'$get_value'(Connection,Con),
	c_DBMS(get_database)(Con,Database).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(show_databases)/2
%
%
DBMS(show_databases)(Connection,database(Databases)) :-
	%'$error_checks'(DBMS(show_databases)(Connection,Database)),
	'$get_value'(Connection,Conn),
	DBMS(result_set)(Mode),
	'$write_or_not'('SHOW DATABASES'),
	c_DBMS(query)('SHOW DATABASES',ResultSet,Conn,Mode,_),
	!,DBMS(row)(ResultSet,1,[Databases]).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(show_databases)/1
% TODO Error Checks
%
DBMS(show_databases)(Connection) :-
	'$error_checks'(DBMS(show_databases)(Connection)),
	'$get_value'(Connection,Conn),
	DBMS(result_set)(Mode),
	'$write_or_not'('SHOW DATABASES'),
	c_DBMS(query)('SHOW DATABASES',ResultSet,Conn,Mode,_),
	c_DBMS(table_write)(ResultSet).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(change_database)/2
%
%
DBMS(change_database)(Connection,Database) :-
	'$error_checks'(DBMS(change_database)(Connection,Database)),
	'$get_value'(Connection,Con),
	'$make_atom'(['USE ',Database],SQL),
	'$write_or_not'(SQL),
	c_DBMS(change_database)(Con,Database).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% DBMS(call_procedure)/4
% DBMS(call_procedure)/3
% DBMS(call_procedure)(+,+,+,?)
% Only support in MySQL 5.0 an above
% Called procedure must return results via MySQL result set
DBMS(call_procedure)(Procedure,Args,Result) :-
	DBMS(call_procedure)(myddas,Procedure,Args,Result).
DBMS(call_procedure)(Connection,Procedure,Args,LA) :-
	'$error_checks'(DBMS(call_procedure)(Connection,Procedure,Args,LA)),
	'$make_atom_args'(Args,ArgsSQL),
	'$make_atom'(['CALL ',Procedure,'(',ArgsSQL,')'],SQL),
	DBMS(sql)(Connection,SQL,LA).
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

DBMS(row)(ResultSet,Arity,Args) :-
    setup_call_catcher_cleanup(
        c_DBMS(row_initialise)(ResultSet,State),
        c_DBMS(row_get)(ResultSet,Arity,Args,State),
	Caught,
        c_DBMS(row_terminate)(State, Caught)
        ).


#endif /* MYDDAS_DBMS */