diff options
Diffstat (limited to 'lib/mnesia/src/mnesia_index.erl')
| -rw-r--r-- | lib/mnesia/src/mnesia_index.erl | 435 |
1 files changed, 309 insertions, 126 deletions
diff --git a/lib/mnesia/src/mnesia_index.erl b/lib/mnesia/src/mnesia_index.erl index be05cfbea3..c79f790973 100644 --- a/lib/mnesia/src/mnesia_index.erl +++ b/lib/mnesia/src/mnesia_index.erl @@ -23,8 +23,8 @@ -module(mnesia_index). -export([read/5, - add_index/5, - delete_index/3, + add_index/6, + delete_index/4, del_object_index/5, clear_index/4, dirty_match_object/3, @@ -39,19 +39,21 @@ get_index_table/3, tab2filename/2, - tab2tmp_filename/2, init_index/2, init_indecies/3, del_transient/2, del_transient/3, - del_index_table/3]). + del_index_table/3, + + index_info/2, + ext_index_instances/1]). -import(mnesia_lib, [val/1, verbose/2]). -include("mnesia.hrl"). -record(index, {setorbag, pos_list}). -%% read an object list throuh its index table +%% read an object list through its index table %% we assume that table Tab has index on attribute number Pos read(Tid, Store, Tab, IxKey, Pos) -> @@ -64,69 +66,103 @@ read(Tid, Store, Tab, IxKey, Pos) -> ResList end. -add_index(Index, Tab, Key, Obj, Old) -> - add_index2(Index#index.pos_list, Index#index.setorbag, Tab, Key, Obj, Old). - -add_index2([{Pos, Ixt} |Tail], bag, Tab, K, Obj, OldRecs) -> - db_put(Ixt, {element(Pos, Obj), K}), - add_index2(Tail, bag, Tab, K, Obj, OldRecs); -add_index2([{Pos, Ixt} |Tail], Type, Tab, K, Obj, OldRecs0) -> +ext_index_instances(Tab) -> + #index{pos_list = PosL} = val({Tab, index_info}), + lists:foldr( + fun({_, {{ext,Alias,Mod}, Tag}}, Acc) -> + [{Alias, Mod, Tag}|Acc]; + (_, Acc) -> + Acc + end, [], PosL). + + +add_index(#index{pos_list = PosL, setorbag = SorB}, + Storage, Tab, Key, Obj, Old) -> + add_index2(PosL, SorB, Storage, Tab, Key, Obj, Old). + +add_index2([{{Pos,Type}, Ixt} |Tail], bag, Storage, Tab, K, Obj, OldRecs) -> + ValsF = index_vals_f(Storage, Tab, Pos), + Vals = ValsF(Obj), + put_index_vals(Type, Ixt, Vals, K), + add_index2(Tail, bag, Storage, Tab, K, Obj, OldRecs); +add_index2([{{Pos, Type}, Ixt} |Tail], SorB, Storage, Tab, K, Obj, OldRecs0) -> %% Remove old tuples in index if Tab is updated + ValsF = index_vals_f(Storage, Tab, Pos), NewVals = ValsF(Obj), OldRecs1 = case OldRecs0 of - undefined -> mnesia_lib:db_get(Tab, K); + undefined -> mnesia_lib:db_get(Storage, Tab, K); _ -> OldRecs0 end, - IdxVal = element(Pos, Obj), - case [Old || Old <- OldRecs1, element(Pos, Old) =/= IdxVal] of - [] when OldRecs1 =:= [] -> %% Write - db_put(Ixt, {element(Pos, Obj), K}), - add_index2(Tail, Type, Tab, K, Obj, OldRecs0); + IdxVal = ValsF(Obj), + case [Old || Old <- OldRecs1, ValsF(Old) =/= IdxVal] of + [] when OldRecs1 =:= [] -> % Write + put_index_vals(Type, Ixt, NewVals, K), + add_index2(Tail, SorB, Storage, Tab, K, Obj, OldRecs1); [] -> %% when OldRecs1 =/= [] Update without modifying index field - add_index2(Tail, Type, Tab, K, Obj, OldRecs0); + add_index2(Tail, SorB, Storage, Tab, K, Obj, OldRecs1); OldRecs -> %% Update - db_put(Ixt, {element(Pos, Obj), K}), - del_ixes(Ixt, OldRecs, Pos, K), - add_index2(Tail, Type, Tab, K, Obj, OldRecs0) + put_index_vals(Type, Ixt, NewVals, K), + [del_ixes(Type, Ixt, ValsF, OldObj, K) || OldObj <- OldRecs], + add_index2(Tail, SorB, Storage, Tab, K, Obj, OldRecs1) end; -add_index2([], _, _Tab, _K, _Obj, _) -> ok. +add_index2([], _, _, _Tab, _K, _Obj, _) -> ok. + +delete_index(Index, Storage, Tab, K) -> + delete_index2(Index#index.pos_list, Storage, Tab, K). -delete_index(Index, Tab, K) -> - delete_index2(Index#index.pos_list, Tab, K). +delete_index2([{{Pos, Type}, Ixt} | Tail], Storage, Tab, K) -> + DelObjs = mnesia_lib:db_get(Storage, Tab, K), + ValsF = index_vals_f(Storage, Tab, Pos), + [del_ixes(Type, Ixt, ValsF, Obj, K) || Obj <- DelObjs], + delete_index2(Tail, Storage, Tab, K); +delete_index2([], _Storage, _Tab, _K) -> ok. -delete_index2([{Pos, Ixt} | Tail], Tab, K) -> - DelObjs = mnesia_lib:db_get(Tab, K), - del_ixes(Ixt, DelObjs, Pos, K), - delete_index2(Tail, Tab, K); -delete_index2([], _Tab, _K) -> ok. +put_index_vals(ordered, Ixt, Vals, K) -> + [db_put(Ixt, {{V, K}}) || V <- Vals]; +put_index_vals(bag, Ixt, Vals, K) -> + [db_put(Ixt, {V, K}) || V <- Vals]. -del_ixes(_Ixt, [], _Pos, _L) -> ok; -del_ixes(Ixt, [Obj | Tail], Pos, Key) -> - db_match_erase(Ixt, {element(Pos, Obj), Key}), - del_ixes(Ixt, Tail, Pos, Key). +del_ixes(bag, Ixt, ValsF, Obj, Key) -> + Vals = ValsF(Obj), + [db_match_erase(Ixt, {V, Key}) || V <- Vals]; +del_ixes(ordered, Ixt, ValsF, Obj, Key) -> + Vals = ValsF(Obj), + [db_erase(Ixt, {V,Key}) || V <- Vals]. -del_object_index(Index, Tab, K, Obj, Old) -> - del_object_index2(Index#index.pos_list, Index#index.setorbag, Tab, K, Obj, Old). +del_object_index(#index{pos_list = PosL, setorbag = SorB}, Storage, Tab, K, Obj) -> + del_object_index2(PosL, SorB, Storage, Tab, K, Obj). -del_object_index2([], _, _Tab, _K, _Obj, _Old) -> ok; -del_object_index2([{Pos, Ixt} | Tail], SoB, Tab, K, Obj, Old) -> +del_object_index2([], _, _Storage, _Tab, _K, _Obj) -> ok; +del_object_index2([{{Pos, Type}, Ixt} | Tail], SoB, Storage, Tab, K, Obj) -> + ValsF = index_vals_f(Storage, Tab, Pos), case SoB of bag -> - del_object_bag(Tab, K, Obj, Pos, Ixt, Old); + del_object_bag(Type, ValsF, Tab, K, Obj, Ixt); _ -> %% If set remove the tuple in index table - del_ixes(Ixt, [Obj], Pos, K) + del_ixes(Type, Ixt, ValsF, Obj, K) end, - del_object_index2(Tail, SoB, Tab, K, Obj, Old). - -del_object_bag(Tab, Key, Obj, Pos, Ixt, undefined) -> - IxKey = element(Pos, Obj), - Old = [X || X <- mnesia_lib:db_get(Tab, Key), element(Pos, X) =:= IxKey], - del_object_bag(Tab, Key, Obj, Pos, Ixt, Old); -%% If Tab type is bag we need remove index identifier if the object being -%% deleted was the last one -del_object_bag(_Tab, Key, Obj, Pos, Ixt, Old) when Old =:= [Obj] -> - del_ixes(Ixt, [Obj], Pos, Key); -del_object_bag(_Tab, _Key, _Obj, _Pos, _Ixt, _Old) -> ok. + del_object_index2(Tail, SoB, Storage, Tab, K, Obj). + +del_object_bag(Type, ValsF, Tab, Key, Obj, Ixt) -> + IxKeys = ValsF(Obj), + Found = [{X, ValsF(X)} || X <- mnesia_lib:db_get(Tab, Key)], + del_object_bag_(IxKeys, Found, Type, Tab, Key, Obj, Ixt). + +del_object_bag_([IxK|IxKs], Found, Type, Tab, Key, Obj, Ixt) -> + case [X || {X, Ixes} <- Found, lists:member(IxK, Ixes)] of + [Old] when Old =:= Obj -> + case Type of + bag -> + db_match_erase(Ixt, {IxK, Key}); + ordered -> + db_erase(Ixt, {{IxK, Key}}) + end; + _ -> + ok + end, + del_object_bag_(IxKs, Found, Type, Tab, Key, Obj, Ixt); +del_object_bag_([], _, _, _, _, _, _) -> + ok. clear_index(Index, Tab, K, Obj) -> clear_index2(Index#index.pos_list, Tab, K, Obj). @@ -138,8 +174,9 @@ clear_index2([{_Pos, Ixt} | Tail], Tab, K, Obj) -> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% -dirty_match_object(Tab, Pat, Pos) -> +dirty_match_object(Tab, Pat, Pos) when is_integer(Pos) -> %% Assume that we are on the node where the replica is + %% Cannot use index plugins here, as they don't map to match patterns case element(2, Pat) of '_' -> IxKey = element(Pos, Pat), @@ -161,7 +198,7 @@ realkeys(Tab, Pos, IxKey) -> Index = get_index_table(Tab, Pos), db_get(Index, IxKey). % a list on the form [{IxKey, RealKey1} , .... -dirty_select(Tab, Spec, Pos) -> +dirty_select(Tab, Spec, Pos) when is_integer(Pos) -> %% Assume that we are on the node where the replica is %% Returns the records without applying the match spec %% The actual filtering is handled by the caller @@ -171,59 +208,80 @@ dirty_select(Tab, Spec, Pos) -> lists:append([mnesia_lib:db_get(StorageType, Tab, Key) || {_,Key} <- RealKeys]). dirty_read(Tab, IxKey, Pos) -> - ResList = mnesia:dirty_rpc(Tab, ?MODULE, dirty_read2, - [Tab, IxKey, Pos]), - case val({Tab, setorbag}) of - bag -> - %% Remove all tuples which don't include Ixkey - mnesia_lib:key_search_all(IxKey, Pos, ResList); - _ -> - ResList - end. + mnesia:dirty_rpc(Tab, ?MODULE, dirty_read2, + [Tab, IxKey, Pos]). dirty_read2(Tab, IxKey, Pos) -> - Ix = get_index_table(Tab, Pos), - Keys = db_match(Ix, {IxKey, '$1'}), - r_keys(Keys, Tab, []). - -r_keys([[H]|T],Tab,Ack) -> - V = mnesia_lib:db_get(Tab, H), - r_keys(T, Tab, V ++ Ack); -r_keys([], _, Ack) -> - Ack. + #index{pos_list = PosL} = val({Tab, index_info}), + Storage = val({Tab, storage_type}), + {Type, Ixt} = pick_index(PosL, Tab, Pos), + Pat = case Type of + ordered -> [{{{IxKey, '$1'}}, [], ['$1']}]; + bag -> [{{IxKey, '$1'}, [], ['$1']}] + end, + Keys = db_select(Ixt, Pat), + ValsF = index_vals_f(Storage, Tab, Pos), + lists:reverse( + lists:foldl( + fun(K, Acc) -> + lists:foldl( + fun(Obj, Acc1) -> + case lists:member(IxKey, ValsF(Obj)) of + true -> [Obj|Acc1]; + false -> Acc1 + end + end, Acc, mnesia_lib:db_get(Storage, Tab, K)) + end, [], Keys)). + +pick_index([{{{Pfx,_},IxType}, Ixt}|_], _Tab, {_} = Pfx) -> + {IxType, Ixt}; +pick_index([{{Pos,IxType}, Ixt}|_], _Tab, Pos) -> + {IxType, Ixt}; +pick_index([_|T], Tab, Pos) -> + pick_index(T, Tab, Pos); +pick_index([], Tab, Pos) -> + mnesia:abort({no_exist, Tab, {index, Pos}}). + %%%%%%% Creation, Init and deletion routines for index tables %% We can have several indexes on the same table %% this can be a fairly costly operation if table is *very* large -tab2filename(Tab, Pos) -> +tab2filename(Tab, {A}) when is_atom(A) -> + mnesia_lib:dir(Tab) ++ "_-" ++ atom_to_list(A) ++ "-.DAT"; +tab2filename(Tab, T) when is_tuple(T) -> + tab2filename(Tab, element(1, T)); +tab2filename(Tab, Pos) when is_integer(Pos) -> mnesia_lib:dir(Tab) ++ "_" ++ integer_to_list(Pos) ++ ".DAT". -tab2tmp_filename(Tab, Pos) -> - mnesia_lib:dir(Tab) ++ "_" ++ integer_to_list(Pos) ++ ".TMP". - init_index(Tab, Storage) -> - PosList = val({Tab, index}), + Cs = val({Tab, cstruct}), + PosList = Cs#cstruct.index, init_indecies(Tab, Storage, PosList). init_indecies(Tab, Storage, PosList) -> case Storage of unknown -> ignore; + {ext, Alias, Mod} -> + init_ext_index(Tab, Storage, Alias, Mod, PosList); disc_only_copies -> - init_disc_index(Tab, PosList); + init_disc_index(Tab, Storage, PosList); ram_copies -> - make_ram_index(Tab, PosList); + make_ram_index(Tab, Storage, PosList); disc_copies -> - make_ram_index(Tab, PosList) + make_ram_index(Tab, Storage, PosList) end. %% works for both ram and disc indexes del_index_table(_, unknown, _) -> ignore; -del_index_table(Tab, Storage, Pos) -> +del_index_table(Tab, Storage, {_} = Pos) -> + delete_transient_index(Tab, Pos, Storage), + mnesia_lib:del({Tab, index}, Pos); +del_index_table(Tab, Storage, Pos) when is_integer(Pos) -> delete_transient_index(Tab, Pos, Storage), mnesia_lib:del({Tab, index}, Pos). @@ -236,13 +294,24 @@ del_transient(Tab, [Pos | Tail], Storage) -> delete_transient_index(Tab, Pos, Storage), del_transient(Tab, Tail, Storage). +delete_transient_index(Tab, Pos, {ext, Alias, Mod}) -> + PosInfo = case Pos of + _ when is_integer(Pos) -> + Cs = val({Tab, cstruct}), + lists:keyfind(Pos, 1, Cs#cstruct.index); + {P, T} -> {P, T} + end, + Tag = {Tab, index, PosInfo}, + Mod:close_table(Alias, Tag), + Mod:delete_table(Alias, Tag), + del_index_info(Tab, Pos), + mnesia_lib:unset({Tab, {index, Pos}}); delete_transient_index(Tab, Pos, disc_only_copies) -> Tag = {Tab, index, Pos}, mnesia_monitor:unsafe_close_dets(Tag), _ = file:delete(tab2filename(Tab, Pos)), del_index_info(Tab, Pos), %% Uses val(..) mnesia_lib:unset({Tab, {index, Pos}}); - delete_transient_index(Tab, Pos, _Storage) -> Ixt = val({Tab, {index, Pos}}), ?ets_delete_table(Ixt), @@ -252,11 +321,12 @@ delete_transient_index(Tab, Pos, _Storage) -> %%%%% misc functions for the index create/init/delete functions above %% assuming that the file exists. -init_disc_index(_Tab, []) -> +init_disc_index(_Tab, _Storage, []) -> done; -init_disc_index(Tab, [Pos | Tail]) when is_integer(Pos) -> +init_disc_index(Tab, disc_only_copies, [{Pos,_Pref} | Tail]) -> + PosInfo = {Pos, bag}, Fn = tab2filename(Tab, Pos), - IxTag = {Tab, index, Pos}, + IxTag = {Tab, index, PosInfo}, _ = file:delete(Fn), Args = [{file, Fn}, {keypos, 1}, {type, bag}], mnesia_monitor:open_dets(IxTag, Args), @@ -269,16 +339,59 @@ init_disc_index(Tab, [Pos | Tail]) when is_integer(Pos) -> mnesia_lib:db_fixtable(Storage, Tab, true), ok = dets:init_table(IxTag, create_fun(Init, Tab, Pos)), mnesia_lib:db_fixtable(Storage, Tab, false), - mnesia_lib:set({Tab, {index, Pos}}, IxTag), - add_index_info(Tab, val({Tab, setorbag}), {Pos, {dets, IxTag}}), - init_disc_index(Tab, Tail). + mnesia_lib:set({Tab, {index, PosInfo}}, IxTag), + add_index_info(Tab, val({Tab, setorbag}), {PosInfo, {dets, IxTag}}), + init_disc_index(Tab, Storage, Tail). + +init_ext_index(_, _, _, _, []) -> + done; +init_ext_index(Tab, Storage, Alias, Mod, [{Pos,Type} | Tail]) -> + PosInfo = {Pos, Type}, + IxTag = {Tab, index, PosInfo}, + CS = val({Tab, cstruct}), + CsList = mnesia_schema:cs2list(CS), + _Res = mnesia_monitor:unsafe_create_external(IxTag, Alias, Mod, CsList), + Mod:load_table(Alias, IxTag, init_index, CsList), + case Mod:is_index_consistent(Alias, IxTag) of + false -> + Mod:index_is_consistent(Alias, IxTag, false), + Mod:match_delete(Alias, IxTag, '_'), + IxValsF = index_vals_f(Storage, Tab, Pos), + IxObjF = case Type of + bag -> fun(IxVal, Key) -> {IxVal, Key} end; + ordered -> fun(IxVal, Key) -> {{IxVal, Key}} end + end, + mnesia_lib:db_fixtable(Storage, Tab, true), + mnesia_lib:db_foldl( + Storage, + fun(Rec, Acc) -> + Key = element(2, Rec), + lists:foreach( + fun(V) -> + IxObj = IxObjF(V, Key), + Mod:insert(Alias, IxTag, IxObj) + end, IxValsF(Rec)), + Acc + end, ok, Tab, + [{'_', [], ['$_']}], 100), + Mod:index_is_consistent(Alias, IxTag, true); + true -> + ignore + end, + + mnesia_lib:set({Tab, {index, PosInfo}}, IxTag), + + add_index_info(Tab, val({Tab, setorbag}), {PosInfo, {Storage, IxTag}}), + init_ext_index(Tab, Storage, Alias, Mod, Tail). create_fun(Cont, Tab, Pos) -> + IxF = index_vals_f(disc_only_copies, Tab, Pos), fun(read) -> Data = case Cont of {start, KeysPerChunk} -> - mnesia_lib:db_init_chunk(disc_only_copies, Tab, KeysPerChunk); + mnesia_lib:db_init_chunk( + disc_only_copies, Tab, KeysPerChunk); '$end_of_table' -> '$end_of_table'; _Else -> @@ -288,56 +401,82 @@ create_fun(Cont, Tab, Pos) -> '$end_of_table' -> end_of_input; {Recs, Next} -> - IdxElems = [{element(Pos, Obj), element(2, Obj)} || Obj <- Recs], + IdxElems = lists:flatmap( + fun(Obj) -> + PrimK = element(2, Obj), + [{V, PrimK} || V <- IxF(Obj)] + end, Recs), {IdxElems, create_fun(Next, Tab, Pos)} end; (close) -> ok end. -make_ram_index(_, []) -> +make_ram_index(_, _, []) -> done; -make_ram_index(Tab, [Pos | Tail]) -> - add_ram_index(Tab, Pos), - make_ram_index(Tab, Tail). +make_ram_index(Tab, Storage, [Pos | Tail]) -> + add_ram_index(Tab, Storage, Pos), + make_ram_index(Tab, Storage, Tail). -add_ram_index(Tab, Pos) when is_integer(Pos) -> - verbose("Creating index for ~w ~n", [Tab]), +add_ram_index(Tab, Storage, {Pos, _Pref}) -> + Type = ordered, + verbose("Creating index for ~w ~p ~p~n", [Tab, Pos, Type]), SetOrBag = val({Tab, setorbag}), - IndexType = case SetOrBag of - set -> duplicate_bag; - ordered_set -> duplicate_bag; - bag -> bag - end, - Index = mnesia_monitor:mktab(mnesia_index, [IndexType, public]), + IxValsF = index_vals_f(Storage, Tab, Pos), + IxFun = fun(Val, Key) -> {{Val, Key}} end, + Index = mnesia_monitor:mktab(mnesia_index, [ordered_set, public]), Insert = fun(Rec, _Acc) -> - true = ?ets_insert(Index, {element(Pos, Rec), element(2, Rec)}) + PrimK = element(2, Rec), + true = ?ets_insert( + Index, [IxFun(V, PrimK) + || V <- IxValsF(Rec)]) end, mnesia_lib:db_fixtable(ram_copies, Tab, true), - true = ets:foldl(Insert, true, Tab), + true = mnesia_lib:db_foldl(Storage, Insert, true, Tab), mnesia_lib:db_fixtable(ram_copies, Tab, false), mnesia_lib:set({Tab, {index, Pos}}, Index), - add_index_info(Tab, SetOrBag, {Pos, {ram, Index}}); -add_ram_index(_Tab, snmp) -> + add_index_info(Tab, SetOrBag, {{Pos, Type}, {ram, Index}}); +add_ram_index(_Tab, _, snmp) -> ok. -add_index_info(Tab, Type, IxElem) -> +index_info(SetOrBag, PosList) -> + IxPlugins = mnesia_schema:index_plugins(), + ExpPosList = lists:map( + fun({{P,Type},Ixt} = PI) -> + case P of + {_} = IxN -> + {_, M, F} = + lists:keyfind(IxN, 1, IxPlugins), + {{{IxN,M,F}, Type}, Ixt}; + _ -> + PI + end + end, PosList), + #index{setorbag = SetOrBag, pos_list = ExpPosList}. + +add_index_info(Tab, SetOrBag, IxElem) -> Commit = val({Tab, commit_work}), case lists:keysearch(index, 1, Commit) of false -> - Index = #index{setorbag = Type, - pos_list = [IxElem]}, - %% Check later if mnesia_tm is sensative about the order + IndexInfo = index_info(SetOrBag, [IxElem]), + %% Check later if mnesia_tm is sensitive about the order + mnesia_lib:set({Tab, index_info}, IndexInfo), + mnesia_lib:set({Tab, index}, index_positions(IndexInfo)), mnesia_lib:set({Tab, commit_work}, - mnesia_lib:sort_commit([Index | Commit])); + mnesia_lib:sort_commit([IndexInfo | Commit])); {value, Old} -> %% We could check for consistency here Index = Old#index{pos_list = [IxElem | Old#index.pos_list]}, + mnesia_lib:set({Tab, index_info}, Index), + mnesia_lib:set({Tab, index}, index_positions(Index)), NewC = lists:keyreplace(index, 1, Commit, Index), mnesia_lib:set({Tab, commit_work}, mnesia_lib:sort_commit(NewC)) end. +index_positions(#index{pos_list = PL}) -> + [P || {{P,_},_} <- PL]. + del_index_info(Tab, Pos) -> Commit = val({Tab, commit_work}), case lists:keysearch(index, 1, Commit) of @@ -345,13 +484,21 @@ del_index_info(Tab, Pos) -> %% Something is wrong ignore skip; {value, Old} -> - case lists:keydelete(Pos, 1, Old#index.pos_list) of + case lists:filter(fun({P,_}) -> + element(1,P)=/=Pos + end, + Old#index.pos_list) of [] -> + IndexInfo = index_info(Old#index.setorbag,[]), + mnesia_lib:set({Tab, index_info}, IndexInfo), + mnesia_lib:set({Tab, index}, index_positions(IndexInfo)), NewC = lists:keydelete(index, 1, Commit), mnesia_lib:set({Tab, commit_work}, mnesia_lib:sort_commit(NewC)); New -> Index = Old#index{pos_list = New}, + mnesia_lib:set({Tab, index_info}, Index), + mnesia_lib:set({Tab, index}, index_positions(Index)), NewC = lists:keyreplace(index, 1, Commit, Index), mnesia_lib:set({Tab, commit_work}, mnesia_lib:sort_commit(NewC)) @@ -360,33 +507,69 @@ del_index_info(Tab, Pos) -> db_put({ram, Ixt}, V) -> true = ?ets_insert(Ixt, V); +db_put({{ext, _, _} = Ext, Ixt}, V) -> + mnesia_lib:db_put(Ext, Ixt, V); db_put({dets, Ixt}, V) -> ok = dets:insert(Ixt, V). -db_get({ram, Ixt}, K) -> - ?ets_lookup(Ixt, K); +db_get({ram, _}=Ixt, IxKey) -> + Pat = [{{{IxKey, '$1'}}, [], [{element, 1, '$_'}]}], + db_select(Ixt, Pat); +db_get({{ext,_,_} = _Storage, {_,_,{_,Type}}} = Ixt, IxKey) -> + Pat = case Type of + ordered -> [{{{IxKey, '$1'}}, [], [{element, 1, '$_'}]}]; + bag -> [{{IxKey, '_'}, [], ['$_']}] + end, + db_select(Ixt, Pat); db_get({dets, Ixt}, K) -> dets:lookup(Ixt, K). +db_erase({ram, Ixt}, K) -> + ?ets_delete(Ixt, K); +db_erase({{ext,_,_} = Ext, Ixt}, K) -> + mnesia_lib:db_erase(Ext, Ixt, K); +db_erase({dets, Ixt}, K) -> + dets:delete(Ixt, K). + db_match_erase({ram, Ixt}, Pat) -> true = ?ets_match_delete(Ixt, Pat); +db_match_erase({{ext,_,_} = Ext, Ixt}, Pat) -> + mnesia_lib:db_match_erase(Ext, Ixt, Pat); db_match_erase({dets, Ixt}, Pat) -> ok = dets:match_delete(Ixt, Pat). -db_match({ram, Ixt}, Pat) -> - ?ets_match(Ixt, Pat); -db_match({dets, Ixt}, Pat) -> - dets:match(Ixt, Pat). +db_select({ram, Ixt}, Pat) -> + ets:select(Ixt, Pat); +db_select({{ext,_,_} = Ext, Ixt}, Pat) -> + mnesia_lib:db_select(Ext, Ixt, Pat); +db_select({dets, Ixt}, Pat) -> + dets:select(Ixt, Pat). + get_index_table(Tab, Pos) -> get_index_table(Tab, val({Tab, storage_type}), Pos). -get_index_table(Tab, ram_copies, Pos) -> - {ram, val({Tab, {index, Pos}})}; -get_index_table(Tab, disc_copies, Pos) -> - {ram, val({Tab, {index, Pos}})}; -get_index_table(Tab, disc_only_copies, Pos) -> - {dets, val({Tab, {index, Pos}})}; -get_index_table(_Tab, unknown, _Pos) -> - unknown. - +get_index_table(Tab, _Storage, Pos) -> + #index{pos_list = PosL} = val({Tab, index_info}), + {_IxType, Ixt} = pick_index(PosL, Tab, Pos), + Ixt. + +index_vals_f(Storage, Tab, {_} = Pos) -> + index_vals_f(Storage, Tab, + lists:keyfind(Pos, 1, mnesia_schema:index_plugins())); +index_vals_f(_Storage, Tab, {Pos,M,F}) -> + fun(Obj) -> + M:F(Tab, Pos, Obj) + end; +index_vals_f(Storage, Tab, Pos) when is_integer(Pos) -> + case mnesia_lib:semantics(Storage, index_fun) of + undefined -> + fun(Obj) -> + [element(Pos, Obj)] + end; + F when is_function(F, 4) -> + {ext, Alias, _Mod} = Storage, + fun(Obj) -> + F(Alias, Tab, Pos, Obj) + end + end. |