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apq-links.adb
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apq-links.adb
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-- --
-- package APQ.Links Copyright (c) Dmitry A. Kazakov --
-- Implementation Luebeck --
-- Winter, 2004 --
-- --
-- Last revision : 18:59 10 Feb 2008 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with APQ.Common; use APQ.Common;
package body APQ.Links is
procedure Create_Table
( Data_Base : in out APQ_Data_Base;
Table_Name : String
) is
begin
Prepare
( Data_Base.Query.all,
( "CREATE TABLE "
& Table_Name
& " (dependant "
& Ref_Type (Data_Base)
& ", referent "
& Ref_Type (Data_Base)
& ")"
) );
Execute (Data_Base);
end Create_Table;
procedure Delete
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Object : Object_ID
) is
Command : Root_Query_Type'Class renames Data_Base.Query.all;
begin
Prepare
( Command,
( "DELETE FROM "
& Table_Name
& " WHERE dependant ="
) );
Append (Command, Object, " OR referent =");
Append (Command, Object);
Execute (Data_Base);
end Delete;
function Depends_On
( Data_Base : APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referent : Object_ID
) return Boolean is
Command : Root_Query_Type'Class renames Data_Base.Query.all;
begin
Prepare
( Command,
"SELECT dependant FROM " & Table_Name & " WHERE dependant ="
);
Append (Command, Dependant, " AND referent =");
Append (Command, Referent);
Execute (Data_Base);
Fetch (Command);
Clear (Command);
return True;
exception
when No_Tuple =>
Clear (Command);
return False;
end Depends_On;
procedure Get_Set
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Key_Name : String;
Data_Name : String;
Key_Value : Object_ID;
Data_Set : in out Set
) is
Command : Root_Query_Type'Class renames Data_Base.Query.all;
Data_ID : Object_ID;
begin
Prepare
( Command,
( "SELECT "
& Data_Name
& " FROM "
& Table_Name
& " WHERE "
& Key_Name
& " ="
) );
Append (Command, Key_Value);
Execute (Data_Base);
while not End_of_Query (Command) loop
Fetch (Command);
Data_ID := Value (Command, 1);
if Key_Value /= Data_ID then
Add (Data_Set, Data_ID);
end if;
end loop;
Clear (Command);
exception
when No_Tuple | Null_Value =>
Clear (Command);
end Get_Set;
procedure Get_Dependants
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Referent : Object_ID;
Dependants : in out Set
) is
begin
Get_Set
( Data_Base => Data_Base,
Table_Name => Table_Name,
Key_Name => "referent",
Data_Name => "dependant",
Key_Value => Referent,
Data_Set => Dependants
);
end Get_Dependants;
procedure Get_References
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referents : in out Set
) is
begin
Get_Set
( Data_Base => Data_Base,
Table_Name => Table_Name,
Key_Name => "dependant",
Data_Name => "referent",
Key_Value => Dependant,
Data_Set => Referents
);
end Get_References;
procedure Get_References
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referents : in out Unbounded_Array;
Pointer : in out Integer
) is
Command : Root_Query_Type'Class renames Data_Base.Query.all;
Data_ID : Object_ID;
begin
Prepare
( Command,
( "SELECT referent FROM "
& Table_Name
& " WHERE dependant ="
) );
Append (Command, Dependant);
Execute (Data_Base);
while not End_of_Query (Command) loop
Fetch (Command);
Data_ID := Value (Command, 1);
if Dependant /= Data_ID then
Put (Referents, Pointer, Data_ID);
Pointer := Pointer + 1;
end if;
end loop;
Clear (Command);
exception
when No_Tuple | Null_Value =>
Clear (Command);
end Get_References;
function Has_Dependants
( Data_Base : APQ_Data_Base;
Table_Name : String;
Referent : Object_ID
) return Boolean is
Command : Root_Query_Type'Class renames Data_Base.Query.all;
begin
Prepare
( Command,
"SELECT * FROM " & Table_Name & " WHERE referent ="
);
Append (Command, Referent);
Execute (Data_Base);
loop
Fetch (Command);
if Value (Command, 1) /= Referent then
Clear (Command);
return True;
end if;
end loop;
exception
when No_Tuple | Null_Value =>
Clear (Command);
return False;
end Has_Dependants;
procedure Reference
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referent : Object_ID
) is
Command : Root_Query_Type'Class renames Data_Base.Query.all;
begin
if not Depends_On
( Data_Base,
Table_Name,
Dependant,
Referent
)
then
Prepare (Command, "INSERT INTO " & Table_Name & " VALUES (");
Append (Command, Dependant, ",");
Append (Command, Referent, ")");
Execute (Data_Base);
end if;
end Reference;
procedure Unreference
( Data_Base : in out APQ_Data_Base;
Table_Name : String;
Dependant : Object_ID;
Referent : Object_ID
) is
Command : Root_Query_Type'Class renames Data_Base.Query.all;
begin
Prepare
( Command,
"DELETE FROM " & Table_Name & " WHERE dependant ="
);
Append (Command, Dependant, " AND Referent = ");
Append (Command, Referent);
Execute (Data_Base);
end Unreference;
end APQ.Links;