/************************************************************************* * * * 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.yap * * Last rev: * * mods: * * comments: Global predicates for the MyDDAS Interface * * * *************************************************************************/ //:- load_foreign_files([myddas], [], init_myddas). /* Initialize MYDDAS GLOBAL STRUCTURES */ :- c_db_initialize_myddas. #ifdef DEBUG :- yap_flag(single_var_warnings,on). #endif #define SWITCH(Contype, G) \ ( Contype == mysql -> \ my_ ## G \ ; \ Contype == sqlite3 -> \ sqlite3_ ## G \ ; \ Contype == postgres -> \ postgres_ ## G \ ; \ Contype == odbc -> \ odbc_ ## G \ ) #define C_SWITCH(Contype, G) \ ( Contype == mysql -> \ c_my_ ## G \ ; \ Contype == sqlite3 -> \ c_sqlite3_ ## G \ ; \ Contype == postgres -> \ c_postgres_ ## G \ ; \ Contype == odbc -> \ c_odbc_ ## G \ ) :- module(myddas,[ db_open/5, db_open/4, db_open/2, db_open/1, db_open/0, db_close/1, db_close/0, db_verbose/1, db_module/1, db_is_database_predicate/3, #ifdef MYDDAS_STATS db_stats/1, db_stats/2, db_stats_time/2, #endif db_sql/2, db_sql/3, db_sql_select/3, db_prolog_select/2, db_prolog_select/3, db_prolog_select_multi/3, db_command/2, db_assert/2, db_assert/1, db_create_table/3, db_export_view/4, db_update/2, db_describe/2, db_describe/3, db_show_tables/2, db_show_tables/1, db_get_attributes_types/2, db_get_attributes_types/3, db_number_of_fields/2, db_number_of_fields/3, db_multi_queries_number/2 % myddas_top_level.ypp #ifdef MYDDAS_TOP_LEVEL , db_top_level/4, db_top_level/5, db_datalog_select/3 #endif % myddas_assert_predicates.ypp , db_import/2, db_import/3, db_view/2, db_view/3, db_insert/2, db_insert/3, db_abolish/2, db_listing/0, db_listing/1 % myddas_mysql.ypp ]). #ifdef MYDDAS_TOP_LEVEL :- use_module(myddas_top_level,[ db_top_level/4, db_top_level/5, db_datalog_select/3 ]). #endif :- use_module(myddas_assert_predicates,[ db_import/2, db_import/3, db_view/2, db_view/3, db_insert/2, db_insert/3, db_abolish/2, db_listing/0, db_listing/1 ]). :- use_module(myddas_sqlite3,[ % myddas_mysql.ypp c_sqlite3_connect/4, c_sqlite3_disconnect/1, c_sqlite3_query/5, sqlite3_result_set/1, c_sqlite3_number_of_fields/3, c_sqlite3_get_attributes_types/3, sqlite3_describe/3, sqlite3_show_tables/2, sqlite3_row/3 ]). :- use_module(myddas_util_predicates,[ '$prolog2sql'/3, '$create_multi_query'/3, '$get_multi_results'/4, '$process_sql_goal'/4, '$process_fields'/3, '$get_values_for_insert'/3, '$make_atom'/2, '$write_or_not'/1, '$abolish_all'/1, '$make_a_list'/2, '$get_table_name'/2, '$get_values_for_update'/4, '$extract_args'/4, #ifdef MYDDAS_STATS '$make_stats_list'/2, #endif '$lenght'/2 ]). :- use_module(myddas_errors,[ '$error_checks'/1 ]). :- use_module(myddas_prolog2sql,[ translate/3, queries_atom/2 ]). :- use_module(library(lists),[ append/3 ]). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_open/5 % db_open/4 % %% @pred db_open(+Interface,-Handle,+HostDb,+User,+Password) %% @pred db_open(+Interface,+HostDb,+User,+Password) % % Connect to a database-server, or open a file as a database, Paraameters are: % % _Interface_ : a supported server, it may be one of mysql, odbc, postgres, sqlite3. % _Handle_ : a name that refers to the database-conectionn. By default is `myddas`, % _Connection Info': either a sequence Host/Db/Port/Socket or a file name. You can use 0 for the defaukt port and sockets, % _UserId_; the use identifier, ignored by sqlite3; % _Password_ : access control, ignored by sqlite3, % % % db_open(Interface,HostDb,User,Password):- db_open(Interface,myddas,HostDb,User,Password). #ifdef MYDDAS_MYSQL db_open(mysql,Connection,Host/Db/Port/Socket,User,Password) :- !, '$error_checks'(db_open(mysql,Connection,Host/Db/Port/Socket,User,Password)), c_db_my_connect(Host,User,Password,Db,Port,Socket,Con), set_value(Connection,Con). db_open(mysql,Connection,Host/Db/Port,User,Password) :- integer(Port),!, db_open(mysql,Connection,Host/Db/Port/_,User,Password). % Var to be NULL, the default socket db_open(mysql,Connection,Host/Db/Socket,User,Password) :- !, db_open(mysql,Connection,Host/Db/0/Socket,User,Password). % 0 is default port db_open(mysql,Connection,Host/Db,User,Password) :- db_open(mysql,Connection,Host/Db/0/_,User,Password). % 0 is default port and Var to be NULL, the default socket #endif #ifdef MYDDAS_POSTGRES db_open(postgres,Connection,Host/Db/Port/Socket,User,Password) :- !, '$error_checks'(db_open(postgres,Connection,Host/Db/Port/Socket,User,Password)), c_db_my_connect(Host,User,Password,Db,Port,Socket,Con), set_value(Connection,Con). db_open(postgres,Connection,Host/Db/Port,User,Password) :- integer(Port),!, db_open(postgres,Connection,Host/Db/Port/_,User,Password). % Var to be NULL, the default socket db_open(postgres,Connection,Host/Db/Socket,User,Password) :- !, db_open(postgres,Connection,Host/Db/0/Socket,User,Password). % 0 is default port db_open(postgres,Connection,Host/Db,User,Password) :- db_open(postgres,Connection,Host/Db/0/_,User,Password). % 0 is default port and Var to be NULL, the default socpket #endif #ifdef MYDDAS_ODBC db_open(odbc,Connection,ODBCEntry,User,Password) :- '$error_checks'(db_open(odbc,Connection,ODBCEntry,User,Password)), c_odbc_connect(ODBCEntry,User,Password,Con), set_value(Connection,Con). #endif %% sqlite3 db_open(sqlite3,Connection,File,User,Password) :- '$error_checks'(db_open(sqlite3,Connection,File,User,Password)), absolute_file_name(File,FullFile,[access(exist),file_errors(error),expand(true)]), c_sqlite3_connect(FullFile,User,Password,Con), set_value(Connection,Con). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% db_close/1 %% db_close/0 % % close a connection _Con_: all its resources are returned, and all undefined % predicates are abolished. Default is to close `myddas`. db_close:- db_close(myddas). db_close(Protocol):- '$error_checks'(db_close(Protocol)), get_value(Protocol,Con), c_db_connection_type(Con,ConType), ( '$abolish_all'(Con) ; set_value(Protocol,[]), % "deletes" atom C_SWITCH( ConType, disconnect(Con) ) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_verbose/1 % % db_verbose(X):- var(X),!, get_value(db_verbose,X). db_verbose(N):-!, set_value(db_verbose,N). %default value :- set_value(db_verbose,0). :- set_value(db_verbose_filename,myddas_queries). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_module/1 % % db_module(X):- var(X),!, get_value(db_module,X). db_module(ModuleName):- set_value(db_module,ModuleName). % default value :- db_module(user). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_is_database_predicate(+,+,+) % % db_is_database_predicate(Module,PredName,Arity):- '$error_checks'(db_is_database_predicate(PredName,Arity,Module)), c_db_check_if_exists_pred(PredName,Arity,Module). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% #ifdef MYDDAS_STATS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_stats(+,-) % % db_stats(List):- db_stats(myddas,List). db_stats(Protocol,List):- '$error_checks'(db_stats(Protocol,List)), NumberOfStats = 10, '$make_a_list'(NumberOfStats,ListX1), ( var(Protocol) -> c_db_stats(0,ListX1) ; get_value(Protocol,Conn), c_db_stats(Conn,ListX1) ), '$make_stats_list'(ListX1,List). #ifdef DEBUG %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_stats_time(+,-) % Reference is C pointer (memory reference) % db_stats_time(Reference,Time):- '$error_checks'(db_stats_time(Reference,Time)), c_db_stats_time(Reference,Time). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% #endif /* DEBUG */ #endif /* MYDDAS_STATS */ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_sql(+,+,-) % % %compatibility db_sql_select(Protocol,SQL,LA):- db_sql(Protocol,SQL,LA). db_sql(SQL,LA):- db_sql(myddas,SQL,LA). db_sql(Connection,SQL,LA):- '$error_checks'(db_sql(Connection,SQL,LA)), get_value(Connection,Con), c_db_connection_type(Con,ConType), db_sql_(ConType, Con, SQL, LA). db_sql_(ConType, Con, SQL,LA):- '$write_or_not'(SQL), ( ConType == mysql -> db_my_result_set(Mode), c_db_my_query(SQL,ResultSet,Con,Mode,Arity) ;ConType == postgres -> postgres_result_set(Mode), c_postgres_query(SQL,ResultSet,Con,Mode,Arity) ;ConType == sqlite3 -> sqlite3_result_set(Mode), c_sqlite3_query(SQL,ResultSet,Con,Mode,Arity) ; c_odbc_query(SQL,ResultSet,Arity,LA,Con), c_odbc_number_of_fields_in_query(SQL,Con,Arity) ), '$make_a_list'(Arity,LA), SWITCH( ConType, row(ResultSet,Arity,LA) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_prolog_select(+,+,+) % % db_prolog_select(LA,DbGoal):- db_prolog_select(myddas,LA,DbGoal). db_prolog_select(Connection,LA,DbGoal):- lenght(LA,Arity), Name=viewname, functor(ViewName,Name,Arity), % build arg list for viewname/Arity ViewName=..[Name|LA], '$prolog2sql'(ViewName,DbGoal,SQL), get_value(Connection,Con), c_db_connection_type(Con,ConType), db_sql_(ConType, Con, SQL,LA). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_prolog_select_multi(+,+,-) % db_prolog_select_multi(guest,[(ramos(A,C),A=C),(ramos(D,B),B=10)],[[A],[D,B]]). % db_prolog_select_multi(Connection,DbGoalsList,ListOfResults) :- '$error_checks'(db_prolog_select_multi(Connection,DbGoalsList,ListOfResults)), '$create_multi_query'(ListOfResults,DbGoalsList,SQL), get_value(Connection,Con), c_db_connection_type(Con,ConType), '$write_or_not'(SQL), C_SWITCH(ConType, query(SQL,ResultSet,Con,Mode,_) ), '$get_multi_results'(Con,ConType,ResultSet,ListOfResults). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_command/2 % % db_command(Connection,SQL):- '$error_checks'(db_command(Connection,SQL)), get_value(Connection,Con), '$write_or_not'(SQL), c_db_connection_type(Con,ConType), ( ConType == mysql -> db_my_result_set(Mode), c_db_my_query(SQL,_,Con,Mode,_) ; true ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_assert/2 % db_assert/1 % db_assert(PredName):- db_assert(myddas,PredName). db_assert(Connection,PredName):- translate(PredName,PredName,Code), '$error_checks'(db_insert2(Connection,PredName,Code)), '$get_values_for_insert'(Code,ValuesList,RelName), '$make_atom'(['INSERT INTO `',RelName,'` VALUES '|ValuesList],SQL), get_value(Connection,Con), c_db_connection_type(Con,ConType), '$write_or_not'(SQL), ( ConType == mysql -> db_my_result_set(Mode), c_db_my_query(SQL,_,Con,Mode,_) ;ConType == postgres -> postgres_result_set(Mode), c_postgres_query(SQL,_,Con,Mode,_) ;ConType == sqlite3 -> sqlite3_result_set(Mode), c_sqlite3_query(SQL,_,Con,Mode,_) ; c_odbc_query(SQL,_,_,_,Con) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_create_table/3 % FieldsList = [field(Name,Type,Null,Key,DefaultValue)] % Example [field(campo1,'char(12)',y,y,a),field(campo2,int,y,y,0)] % TODO Test with ODBC & Type Checks db_create_table(Connection,TableName,FieldsInf):- '$error_checks'(db_create_table(Connection,TableName,FieldsInf)), get_value(Connection,Con), '$process_fields'(FieldsInf,FieldString,KeysSQL), '$make_atom'(['CREATE TABLE `',TableName,'` ( ',FieldString,KeysSQL,' )'],FinalSQL), c_db_connection_type(Con,ConType), '$write_or_not'(FinalSQL), ( ConType == mysql -> db_my_result_set(Mode), c_db_my_query(FinalSQL,_,Con,Mode,_) ;ConType == posgres -> postgres_result_set(Mode), c_postsgres_query(FinalSQL,_,Con,Mode,_) ;ConType == sqlite3 -> sqlite3_result_set(Mode), c_sqlite3_query(FinalSQL,_,Con,Mode,_) ; c_odbc_query(FinalSQL,_,_,_,Con) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_export_view/4 % TODO Test with ODBC % db_export_view(Connection,TableViewName,SQLorDbGoal,FieldsInf):- '$error_checks'(db_export_view(Connection,TableViewName,SQLorDbGoal,FieldsInf)), get_value(Connection,Con), '$process_sql_goal'(TableViewName,SQLorDbGoal,TableName,SQL), % Case there's some information about the % attribute fields of the relation given % by the user ( FieldsInf == [] -> '$make_atom'(['CREATE TABLE ',TableName,' AS ',SQL],FinalSQL) ; '$process_fields'(FieldsInf,FieldString,KeysSQL), '$make_atom'(['CREATE TABLE ',TableName,' (',FieldString,KeysSQL,') AS ',SQL],FinalSQL) ), c_db_connection_type(Con,ConType), '$write_or_not'(FinalSQL), ( ConType == mysql -> db_my_result_set(Mode), c_db_my_query(FinalSQL,_,Con,Mode,_) ; c_odbc_query(FinalSQL,_,_,_,Con) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_update/2 % BUG: db_update dosen't work for this case, just an example % db_update(my1,edge(1,3)-edge(99,99)). % The case where the set condition is "set" to change all the fields db_update(Connection,WherePred-SetPred):- %TODO: error_checks get_value(Connection,Conn), % Match and Values must be "unifiable" functor(WherePred,PredName,Arity), functor(SetPred,PredName,Arity), functor(NewRelation,PredName,Arity), '$extract_args'(WherePred,1,Arity,WhereArgs), '$extract_args'(SetPred,1,Arity,SetArgs), copy_term(WhereArgs,WhereArgsTemp), NewRelation=..[PredName|WhereArgsTemp], translate(NewRelation,NewRelation,Code), '$get_values_for_update'(Code,SetArgs,SetCondition,WhereCondition), '$get_table_name'(Code,TableName), append(SetCondition,WhereCondition,Conditions), '$make_atom'(['UPDATE `',TableName,'` '|Conditions],SQL), '$write_or_not'(SQL), get_value(Connection,Con), c_db_connection_type(Con,ConType), ( ConType == mysql -> db_my_result_set(Mode), c_db_my_query(SQL,_,Conn,Mode,_) ; ConType == mysql -> postgres_result_set(Mode), c_postgres_query(SQL,_,Conn,Mode,_) ; ConType == sqlite3 -> sqlite3_result_set(Mode), c_sqlite3_query(SQL,_,Conn,Mode,_) ; ConType == odbc -> odbc_result_set(Mode), c_odbc_query(SQL,_,Conn,Mode,_) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% /** * @pred db_get_attributes_types(+Conn,+RelationName,-ListOfFields) @pred db_get_attributes_types(RelationName,ListOfFields) Y ou can use the predicate db_get_attributes_types/2 or db_get_attributes_types/3, to know what are the names and attributes types of the fields of a given relation. For example: ~~~~ ?- db_get_attributes_types(myddas,’Hello World’,LA). LA = [’Number’,integer,’Name’,string,’Letter’,string] ? yes ˜˜˜˜ where `Hello World` is the name of the relation and `myddas` is the connection identifier. */ db_get_attributes_types(RelationName,TypesList) :- db_get_attributes_types(myddas,RelationName,TypesList). db_get_attributes_types(Connection,RelationName,TypesList) :- '$error_checks'(db_get_attributes_types(Connection,RelationName,TypesList)), get_value(Connection,Con), c_db_connection_type(Con,ConType), C_SWITCH(ConType, get_attributes_types(RelationName,Con,TypesList) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% /** @pred db_number_of_fields(+Conn,+RelationName,-Arity). @pred db_number_of_fields(+RelationName,-Arity). You can use the predicate db number of fields/2 or db number of fields/3, to know what is the arity of a given relation. @Example ~~~~ ?- db_number_of_fields(myddas,’Hello World’,Arity). Arity = 3 ? yes ˜˜˜˜ where `Hello World` is the name of the relation and `myddas` is the connection identifier. */ % db_number_of_fields(RelationName,Arity) :- db_number_of_fields(myddas,RelationName,Arity). db_number_of_fields(Connection,RelationName,Arity) :- '$error_checks'(db_number_of_fields(Connection,RelationName,Arity)), get_value(Connection,Con), c_db_connection_type(Con,ConType), C_SWITCH(ConType, number_of_fields(RelationName,Con,Arity) ). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% % db_multi_queries_number(+,+) % TODO: EVERITHING % db_multi_queries_number(Connection,Number) :- '$error_checks'(db_multi_queries_number(Connection,Number)), get_value(Connection,Con), c_db_multi_queries_number(Con,Number). %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% db_result_set(X) :- '$error_checks'(db_result_set(X) ), get_value(myddas,Con), c_db_connection_type(Con,DBMS), DBMS:result_set(X). db_datalog_describe(X) :- '$error_checks'(db_datalog_describe(X) ), get_value(myddas,Con), c_db_connection_type(Con,DBMS), DBMS:datalog_describe(X). db_datalog_describe(Connection,Y) :- '$error_checks'(db_datalog_describe(Connection,Y) ), get_value(Connection,Con), c_db_connection_type(Con,DBMS), DBMS:datalog_describe(Connection,Y). /** @pred db_describe(+,+,?) @pred db_describe(+,?) The db describe/3 predicate does the same action as db_datalog_describe/2 predicate but with one major difference. The results are returned by backtracking. For example, the last query done: ~~~~ ?- db_describe(myddas,’Hello World’,Term). Term = tableInfo(’Number’,int(11),’YES’,’’,null(0),’’) ? ; Term = tableInfo(’Name’,char(10),’YES’,’’,null(1),’’) ? ; Term = tableInfo(’Letter’,char(1),’YES’,’’,null(2),’’) ? ; no ~~~~ */ db_describe(Y,Z) :- db_describe(myddas,Y,Z). db_describe(Connection,Y,Z) :- '$error_checks'(db_describe(Connection,Y,Z) ), get_value(Connection,Con), c_db_connection_type(Con,ConType), SWITCH(ConType, describe(Connection,Y,Z) ). db_datalog_show_tables :- db_datalog_show_tables(myddas). db_datalog_show_tables(Connection) :- '$error_checks'(db_datalog_show_tables(Connection) ), get_value(Connection,Con), c_db_connection_type(Con,DBMS), switch( DBMS, datalog_show_tables(Connection) ). db_datalog_show_tables :- '$error_checks'(db_datalog_show_tables), get_value(myddas,Con), c_db_connection_type(Con,DBMS), DBMS:datalog_show_tables. /** @pred db_show_tables(+,?). @pred db_show_tables(?). The db show tables/2 predicate does the same action as db show tables/1 predicate but with one major difference. The results are returned by backtracking. For example, the last query done: ~~~~` `?- db_show_tables(myddas,Table). Table = table(’Hello World’) ? ; ~~~~ ``*/ db_show_tables(Y) :- db_show_tables(myddas,Y). db_show_tables(Connection,Y) :- '$error_checks'(db_show_tables(Connection,Y) ), get_value(Connection,Con), c_db_connection_type(Con,ConType), SWITCH( ConType, show_tables(Connection,Y) ). db_show_database(Connection,Y) :- '$error_checks'(db_show_database(Connection,Y) ), get_value(Connection,Con), c_db_connection_type(Con,DBMS), DBMS:show_database(Connection,Y). db_show_databases(Connection,Y) :- '$error_checks'(db_show_databases(Connection,Y) ), get_value(Connection,Con), c_db_connection_type(Con,DBMS), DBMS:show_databases(Connection,Y). db_show_databases(X) :- '$error_checks'(db_show_databases(X) ), get_value(myddas,Con), c_db_connection_type(Con,DBMS), DBMS:show_databases(X). db_change_database(Connection,Y) :- '$error_checks'(db_change_database(Connection,Y) ), get_value(Connection,Con), c_db_connection_type(Con,DBMS), DBMS:change_database(Connection,Y). db_call_procedure(Connection,Y,Z,W) :- '$error_checks'(db_call_procedure(Connection,Y,Z,W) ), get_value(Connection,Con), c_db_connection_type(Con,DBMS), DBMS:call_procedure(Connection,Y,Z,W). db_call_procedure(X,Y,Z) :- '$error_checks'(db_call_procedure(X,Y,Z) ), get_value(myddas,Con), c_db_connection_type(Con,DBMS), DBMS:call_procedure(X,Y,Z).