/* Part of SWI-Prolog Author: Jan Wielemaker E-mail: J.Wielemaker@vu.nl WWW: http://www.swi-prolog.org Copyright (c) 2002-2013, University of Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(odbc, [ odbc_connect/3, % +DSN, -Conn, +Options odbc_driver_connect/3, % +DriverString, -Conn, +Options odbc_disconnect/1, % +Conn odbc_current_connection/2, % ?Conn, -DSN odbc_set_connection/2, % +Conn, +Option odbc_get_connection/2, % +Conn, ?Option odbc_end_transaction/2, % +Conn, +CommitRollback odbc_query/4, % +Conn, +SQL, -Row, +Options odbc_query/3, % +Conn, +SQL, -Row odbc_query/2, % +Conn, +SQL odbc_prepare/4, % +Conn, +SQL, +Parms, -Qid odbc_prepare/5, % +Conn, +SQL, +Parms, -Qid, +Options odbc_execute/2, % +Qid, +Parms odbc_execute/3, % +Qid, +Parms, -Row odbc_fetch/3, % +Qid, -Row, +Options odbc_close_statement/1, % +Statement odbc_clone_statement/2, % +Statement, -Clone odbc_free_statement/1, % +Statement % DB dictionary info odbc_current_table/2, % +Conn, -Table odbc_current_table/3, % +Conn, -Table, ?Facet odbc_table_column/3, % +Conn, ?Table, ?Column odbc_table_column/4, % +Conn, ?Table, ?Column, ?Facet odbc_type/3, % +Conn, ?Type, -Facet odbc_data_source/2, % ?DSN, ?Description odbc_table_primary_key/3, % +Conn, ?Table, ?Column odbc_table_foreign_key/5, % +Conn, ?PkTable, ?PkColumn, ?FkTable, ?FkColumn odbc_statistics/1, % -Value odbc_debug/1 % +Level ]). :- use_module(library(shlib)). :- use_module(library(lists)). :- use_foreign_library(foreign(odbc4pl)). %! odbc_current_connection(?Conn, ?DSN) is nondet. % % True if Conn is an open ODBC connection to DSN. odbc_current_connection(Conn, DSN) :- odbc_current_connections(Conn, DSN, Pairs), member(Conn-DSN, Pairs). %! odbc_driver_connect(+DriverString, -Connection, +Options) is det. % % Connects to a database using SQLDriverConnect(). This API allows % for driver-specific additional options. DriverString is passed % without checking. Options should *not* include =user= and % =password=. % % Whenever possible, applications should use odbc_connect/3. If % you need this predicate, please check the documentation for % SQLDriverConnect() and the documentation of your driver. % % @tbd Add facilities to deal with prompted completion of the % driver options. odbc_driver_connect(DriverString, Connection, Options) :- odbc_connect(-, Connection, [driver_string(DriverString)|Options]). %! odbc_query(+Connection, +SQL, -Row) % % Run query without options. odbc_query(Connection, SQL, Row) :- odbc_query(Connection, SQL, Row, []). %! odbc_query(+Connection, +SQL) % % Execute SQL-statement that does not produce a result odbc_query(Connection, SQL) :- odbc_query(Connection, SQL, Row), !, ( Row = affected(_) -> true ; print_message(warning, odbc(unexpected_result(Row))) ). odbc_execute(Statement, Parameters) :- odbc_execute(Statement, Parameters, Row), !, ( Row = affected(_) -> true ; print_message(warning, odbc(unexpected_result(Row))) ). odbc_prepare(Connection, SQL, Parameters, Statement) :- odbc_prepare(Connection, SQL, Parameters, Statement, []). /******************************* * SCHEMA STUFF * *******************************/ %! odbc_current_table(-Table, -Facet) % % Enumerate the existing tables. odbc_current_table(Connection, Table) :- odbc_tables(Connection, row(_Qualifier, _Owner, Table, 'TABLE', _Comment)). odbc_current_table(Connection, Table, Facet) :- odbc_tables(Connection, Tuple), arg(3, Tuple, Table), table_facet(Facet, Connection, Tuple). table_facet(qualifier(Qualifier), _, Tuple) :- arg(1, Tuple, Qualifier). table_facet(owner(Owner), _, Tuple) :- arg(2, Tuple, Owner). table_facet(type(Type), _, Tuple) :- arg(4, Tuple, Type). table_facet(comment(Comment), _, Tuple) :- arg(5, Tuple, Comment). table_facet(arity(Arity), Connection, Tuple) :- arg(3, Tuple, Table), findall(C, odbc_table_column(Connection, Table, C), Cs), length(Cs, Arity). %! odbc_table_column(+Connection, +Table, +Column) is semidet. %! odbc_table_column(+Connection, +Table, -Column) is nondet. % % True if Column appears in Table on Connection. odbc_table_column(Connection, Table, Column) :- table_column(Connection, Table, Column, _Tuple). table_column(Connection, Table, Column, Tuple) :- ( var(Table) -> odbc_current_table(Connection, Table) ; true ), ( ground(Column) % force determinism -> odbc_column(Connection, Table, Tuple), arg(4, Tuple, Column), ! ; odbc_column(Connection, Table, Tuple), arg(4, Tuple, Column) ). %! odbc_table_column(+Connection, +Table, ?Column, -Facet) odbc_table_column(Connection, Table, Column, Facet) :- table_column(Connection, Table, Column, Tuple), column_facet(Facet, Tuple). column_facet(table_qualifier(Q), T) :- arg(1, T, Q). column_facet(table_owner(Q), T) :- arg(2, T, Q). column_facet(table_name(Q), T) :- arg(3, T, Q). %column_facet(column_name(Q), T) :- arg(4, T, Q). column_facet(data_type(Q), T) :- arg(5, T, Q). column_facet(type_name(Q), T) :- arg(6, T, Q). column_facet(precision(Q), T) :- non_null_arg(7, T, Q). column_facet(length(Q), T) :- non_null_arg(8, T, Q). column_facet(scale(Q), T) :- non_null_arg(9, T, Q). column_facet(radix(Q), T) :- non_null_arg(10, T, Q). column_facet(nullable(Q), T) :- non_null_arg(11, T, Q). column_facet(remarks(Q), T) :- non_null_arg(12, T, Q). column_facet(type(Type), T) :- arg(6, T, TypeName), sql_type(TypeName, T, Type). %! sql_type(+TypeName, +Row, -Type) % % Create a canonical Prolog representation for the type. This % is very incomplete code. sql_type(dec, T, Type) :- !, sql_type(decimal, T, Type). sql_type(numeric, T, Type) :- !, sql_type(decimal, T, Type). sql_type(decimal, T, Type) :- !, column_facet(precision(Len), T), ( column_facet(scale(D), T), D \== 0 -> Type = decimal(Len, D) ; Type = decimal(Len) ). sql_type(char, T, char(Len)) :- !, column_facet(length(Len), T). sql_type(varchar, T, varchar(Len)) :- !, column_facet(length(Len), T). sql_type(TypeName, _T, Type) :- downcase_atom(TypeName, Type). %! odbc_type(+Connection, +TypeSpec, ?Facet). odbc_type(Connection, TypeSpec, Facet) :- odbc_types(Connection, TypeSpec, Row), type_facet(Facet, Row). type_facet(name(V), Row) :- arg(1, Row, V). type_facet(data_type(V), Row) :- arg(2, Row, V). type_facet(precision(V), Row) :- arg(3, Row, V). type_facet(literal_prefix(V), Row) :- non_null_arg(4, Row, V). type_facet(literal_suffix(V), Row) :- non_null_arg(5, Row, V). type_facet(create_params(V), Row) :- non_null_arg(6, Row, V). type_facet(nullable(V), Row) :- arg(7, Row, I), nullable_arg(I, V). type_facet(case_sensitive(V), Row) :- bool_arg(8, Row, V). type_facet(searchable(V), Row) :- arg(9, Row, I), searchable_arg(I, V). type_facet(unsigned(V), Row) :- bool_arg(10, Row, V). type_facet(money(V), Row) :- bool_arg(11, Row, V). type_facet(auto_increment(V), Row) :- bool_arg(12, Row, V). type_facet(local_name(V), Row) :- non_null_arg(13, Row, V). type_facet(minimum_scale(V), Row) :- non_null_arg(14, Row, V). type_facet(maximum_scale(V), Row) :- non_null_arg(15, Row, V). non_null_arg(Index, Row, V) :- arg(Index, Row, V), V \== '$null$'. bool_arg(Index, Row, V) :- arg(Index, Row, I), int_to_bool(I, V). int_to_bool(0, false). int_to_bool(1, true). nullable_arg(0, false). nullable_arg(1, true). nullable_arg(2, unknown). searchable_arg(0, false). searchable_arg(1, like_only). searchable_arg(2, all_except_like). searchable_arg(4, true). %! odbc_data_source(?DSN, ?Description) % % Enumerate the available data-sources odbc_data_source(DSN, Description) :- odbc_data_sources(List), member(data_source(DSN, Description), List). /******************************* * Primary & foreign keys * *******************************/ %! odbc_table_primary_key(+Connection, +Table, ?Column) % % Enumerate columns in primary key for table odbc_table_primary_key(Connection, Table, Column) :- ( var(Table) -> odbc_current_table(Connection, Table) ; true ), ( ground(Column) % force determinism -> odbc_primary_key(Connection, Table, Tuple), arg(4, Tuple, Column), ! ; odbc_primary_key(Connection, Table, Tuple), arg(4, Tuple, Column) ). %! odbc_table_foreign_key(+Connection, ?PkTable, ?PkCol, ?FkTable, ?FkCol) % % Enumerate foreign keys columns odbc_table_foreign_key(Connection, PkTable, PkColumn, FkTable, FkColumn) :- odbc_foreign_key(Connection, PkTable, FkTable, Tuple), ( var(PkTable) -> arg(3, Tuple, PkTable) ; true ), arg(4, Tuple, PkColumn), ( var(FkTable) -> arg(7, Tuple, FkTable) ; true ), arg(8, Tuple, FkColumn). /******************************* * STATISTICS * *******************************/ odbc_statistics(Key) :- statistics_key(Key), '$odbc_statistics'(Key). statistics_key(statements(_Created, _Freed)). /******************************* * MESSAGES * *******************************/ :- multifile prolog:message/3. prolog:message(error(odbc(ODBCCode, _NativeCode, Comment), _)) --> [ 'ODBC: State ~w: ~w'-[ODBCCode, Comment] ]. prolog:message(error(context_error(Obj, Error, What), _)) --> [ 'Context error: ~w ~w: '-[What, Obj] ], context(Error). prolog:message(odbc(ODBCCode, _NativeCode, Comment)) --> [ 'ODBC: State ~w: ~w'-[ODBCCode, Comment] ]. prolog:message(odbc(unexpected_result(Row))) --> [ 'ODBC: Unexpected result-row: ~p'-[Row] ]. context(in_use) --> [ 'object is in use' ].