diff options
Diffstat (limited to 'lib/mnesia/src/mnesia_index.erl')
| -rw-r--r-- | lib/mnesia/src/mnesia_index.erl | 60 |
1 files changed, 29 insertions, 31 deletions
diff --git a/lib/mnesia/src/mnesia_index.erl b/lib/mnesia/src/mnesia_index.erl index 87cb58dae1..0c882c0df6 100644 --- a/lib/mnesia/src/mnesia_index.erl +++ b/lib/mnesia/src/mnesia_index.erl @@ -3,16 +3,17 @@ %% %% Copyright Ericsson AB 1996-2014. All Rights Reserved. %% -%% The contents of this file are subject to the Erlang Public License, -%% Version 1.1, (the "License"); you may not use this file except in -%% compliance with the License. You should have received a copy of the -%% Erlang Public License along with this software. If not, it can be -%% retrieved online at http://www.erlang.org/. -%% -%% Software distributed under the License is distributed on an "AS IS" -%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See -%% the License for the specific language governing rights and limitations -%% under the License. +%% Licensed under the Apache License, Version 2.0 (the "License"); +%% you may not use this file except in compliance with the License. +%% You may obtain a copy of the License at +%% +%% http://www.apache.org/licenses/LICENSE-2.0 +%% +%% Unless required by applicable law or agreed to in writing, software +%% distributed under the License is distributed on an "AS IS" BASIS, +%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +%% See the License for the specific language governing permissions and +%% limitations under the License. %% %% %CopyrightEnd% %% @@ -45,21 +46,11 @@ del_transient/3, del_index_table/3]). --import(mnesia_lib, [verbose/2]). +-import(mnesia_lib, [val/1, verbose/2]). -include("mnesia.hrl"). -record(index, {setorbag, pos_list}). -val(Var) -> - case ?catch_val(Var) of - {'EXIT', _ReASoN_} -> - case mnesia_lib:other_val(Var) of - error -> mnesia_lib:pr_other(Var, _ReASoN_); - Val -> Val - end; - _VaLuE_ -> _VaLuE_ - end. - %% read an object list throuh its index table %% we assume that table Tab has index on attribute number Pos @@ -79,17 +70,24 @@ add_index(Index, 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, OldRecs) -> +add_index2([{Pos, Ixt} |Tail], Type, Tab, K, Obj, OldRecs0) -> %% Remove old tuples in index if Tab is updated - case OldRecs of - undefined -> - Old = mnesia_lib:db_get(Tab, K), - del_ixes(Ixt, Old, Pos, K); - Old -> - del_ixes(Ixt, Old, Pos, K) - end, - db_put(Ixt, {element(Pos, Obj), K}), - add_index2(Tail, Type, Tab, K, Obj, OldRecs); + OldRecs1 = case OldRecs0 of + undefined -> mnesia_lib:db_get(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); + [] -> %% when OldRecs1 =/= [] Update without modifying index field + add_index2(Tail, Type, Tab, K, Obj, OldRecs0); + OldRecs -> %% Update + db_put(Ixt, {element(Pos, Obj), K}), + del_ixes(Ixt, OldRecs, Pos, K), + add_index2(Tail, Type, Tab, K, Obj, OldRecs0) + end; add_index2([], _, _Tab, _K, _Obj, _) -> ok. delete_index(Index, Tab, K) -> |