The R13B03 release.OTP_R13B03

1 files changed, 144 insertions, 0 deletions

diff --git a/lib/mnesia/doc/src/company_o.erl b/lib/mnesia/doc/src/company_o.erl
new file mode 100644
index 0000000000..3c7ad0d5e5
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+++ b/lib/mnesia/doc/src/company_o.erl
@@ -0,0 +1,144 @@
+%% ``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 via the world wide web 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.
+%% 
+%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
+%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
+%% AB. All Rights Reserved.''
+%% 
+%%     $Id$
+%%
+-module(company_o).
+-compile(export_all).
+
+-import(mnesia, [transaction/1]).
+
+%0
+-include_lib("stdlib/include/qlc.hrl").
+-include("company_o.hrl").
+
+
+sinit() ->
+    mnesia:create_schema([node()]).
+
+init() ->
+    mnesia:create_table(employee,
+                        [{attributes, record_info(fields, employee)}]),
+    mnesia:create_table(dept,
+                        [{attributes, record_info(fields, dept)}]),
+    mnesia:create_table(project, 
+                        [{attributes, record_info(fields, project)}]).
+
+%0
+    
+
+
+%1
+
+insert_emp(Emp, DeptId, ProjNames) ->
+    Fun = fun() ->
+                  mnesia:write(Emp#employee{dept = DeptId, 
+					    projects = ProjNames})
+          end,
+    mnesia:transaction(Fun).
+
+
+%1
+ 
+%2
+females() ->
+    F = fun() ->
+		Q = qlc:q([E#employee.name || E <- mnesia:table(employee),
+					      E#employee.sex == female]),
+		qlc:e(Q)
+	end,
+    mnesia:transaction(F).
+%2
+
+%3
+female_bosses() ->
+    F = fun() -> qlc:e(qlc:q( 
+			 [{E#employee.name, Boss#employee.name} ||
+			     E <- mnesia:table(employee),
+			     Boss <- mnesia:table(employee),
+			     Boss#employee.emp_no == E#employee.manager,
+			     E#employee.sex == female]
+			))
+        end,
+    mnesia:transaction(F).
+
+                    
+%4
+raise_females(Amount) ->
+    F = fun() ->
+		Q = qlc:q([E || E <- mnesia:table(employee),
+                                E#employee.sex == female]),
+		Fs = qlc:e(Q),
+                over_write(Fs, Amount)
+        end,
+    mnesia:transaction(F).
+
+over_write([E|Tail], Amount) ->
+    Salary = E#employee.salary + Amount,
+    New = E#employee{salary = Salary},
+    mnesia:write(New),
+    1 + over_write(Tail, Amount);
+over_write([], _) ->
+    0.
+%4
+
+%5
+raise(Eno, Raise) ->
+    F = fun() ->
+                [E] = mnesia:read({employee, Eno}),
+                Salary = E#employee.salary + Raise,
+                New = E#employee{salary = Salary},
+                mnesia:write(New)
+        end,
+    mnesia:transaction(F).
+%5
+
+
+%6
+bad_raise(Eno, Raise) ->
+    F = fun() ->
+                [E] = mnesia:read({employee, Eno}),
+                Salary = E#employee.salary + Raise,
+                New = E#employee{salary = Salary},
+                io:format("Trying to write ... ~n", []),
+                mnesia:write(New)
+        end,
+    mnesia:transaction(F).
+%6
+                       
+%9
+get_emps(Salary, Dep) ->
+    Q = qlc:q( 
+          [E || E <- mnesia:table(employee),
+                E#employee.salary > Salary,
+                E#employee.dept == Dep]
+	 ),
+    F = fun() -> qlc:e(Q) end,
+    transaction(F).
+%9
+
+%10
+get_emps2(Salary, Dep) ->
+    Epat0 = mnesia:table_info(employee, wild_pattern),
+    Epat = Epat0#employee{dept = Dep},
+    F = fun() ->
+                All = mnesia:match_object(Epat),
+		[E || E <-All, E#employee.salary > Salary ]
+	end,
+    mnesia:transaction(F).
+                
+
+%10
+