105 lines
3.6 KiB
Prolog
105 lines
3.6 KiB
Prolog
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:- ensure_loaded( library(prosqlite) ).
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:- ensure_loaded( library(debug) ).
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predicated :-
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Sfile = 'phones.sqlite',
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does_not_exist( Sfile ),
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create_db,
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interrogate,
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write( 'Deleting database file (phones.sqlite).' ), nl,
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delete_file( Sfile ),
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write( 'Trying to access expired predicate...' ), nl,
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end_bit,
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nodebug( sqlite ),
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write( 'All done.' ), nl.
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end_bit :-
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catch(phones(name=naku,telephone=T),Excp,(write(caught(Excp)),nl,fail)),
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!,
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write( not_really(T) ), nl.
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end_bit.
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create_db :-
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sqlite_connect( phones, phones_db, exists(false) ),
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create( C ),
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sqlite_query( phones_db, C, _AffC ),
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% move to dbf example
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% sqlite_create( phones_db, phones(name+text,telephone-text,address-text) ),
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close_db.
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interrogate :-
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write( 'Testing arity(arity) option (as default).' ), nl,
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sqlite_connect( phones, phones_db, as_predicates(true) ),
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forall( insert(I), (sqlite_query(phones_db,I,Row),write(Row),nl) ),
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report_phones_db,
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findall( U-T, phones(U,T,_), UTs ), write( uts(UTs) ), nl,
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findall( T, phones(naku,T,_), Ts ), write( naku(Ts) ), nl,
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close_db,
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write( 'Testing arity(both) option.' ), nl,
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Opts1 = [as_predicates(true),arity(both)],
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sqlite_connect( phones, phones_db, Opts1 ),
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findall( U-T, phones(U,T,_), UT1s ), write( uts(UT1s) ), nl,
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findall( T, phones(naku,T,_), T1s ), write( naku(T1s) ), nl,
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findall( U-T, phones([name=U,telephone=T]), UT2s ),
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write( uts_unary(UT2s) ), nl,
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findall( T, phones([name=naku,telephone=T]), T2s ),
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write( naku_unary(T2s) ), nl,
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close_db,
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write( 'Trying to map to another predicate name.' ), nl,
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Opts2 = [as_predicates(true),table_as(phones,catalog,unary)],
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sqlite_connect( phones, phones_db, Opts2 ),
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findall( U-T, catalog([name=U,telephone=T]), UT2s ),
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write( uts_catalog(UT2s) ), nl,
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findall( T, catalog([name=naku,telephone=T]), T2s ),
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write( naku_cataloh(T2s) ), nl,
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close_db,
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Mess3='Testing palette value of sqlite_connect/3\'s arity() option.',
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write( Mess3 ), nl,
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Opts3 = [as_predicates(true),arity(palette)],
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sqlite_connect( phones, phones_db, Opts3 ),
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findall( U-T, phones( name=U,telephone=T ), UT4s ),
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write( uts_binary(UT4s) ), nl,
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findall( U-T, phones([name=U,telephone=T]), UT3s ),
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write( uts_unary_list(UT3s) ), nl,
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findall( T, phones([name=naku,telephone=T]), T3s ),
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write( naku_unary_list(T3s) ), nl,
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findall( T, phones( name=naku,telephone=T ), T4s ),
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write( naku_binary(T4s) ), nl,
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report_phones_db,
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sqlite_disconnect( phones_db ),
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write( 'Closed database.' ), nl, nl.
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report_phones_db :-
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write( 'Select * from phones : ' ), nl,
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write( '---' ), nl,
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findall( Row, (sqlite_query(phones_db,'Select * from phones;',Row),write(Row),nl), _ ),
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write( '---' ), nl.
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create( C ) :-
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C = 'CREATE TABLE phones (name text, telephone text, address text, Primary Key (name) );'.
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insert( I ) :-
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I = 'Insert into phones (name, telephone, address) values ("naku","0044","uk");'.
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insert( I ) :-
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I = 'Insert into phones (name, telephone, address) values ("άμπελος","0090","turkey");'.
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% I = 'Insert into phones (name, telephone, address) values ("ozzy","0090","turkey");'.
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close_db :-
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sqlite_disconnect( phones_db ),
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write( 'Closed database, for now.' ), nl, nl.
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does_not_exist( Sfile ) :-
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exists_file( Sfile ),
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!,
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write( 'Delete file "' ),
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write( Sfile ),
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write( '" to proceed with this example.' ), nl,
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fail.
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does_not_exist( _Sfile ).
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del :- delete_file('phones.sqlite').
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