/usr/share/ada/adainclude/gnatcoll/gnatcoll-sql-sessions.adb is in libgnatcoll1.6-dev 1.6gpl2014-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- M O D E L I N G --
-- --
-- Copyright (C) 2010-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, 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 MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
-- ??? Other implementations: no pooling (connection/close each time)
-- ??? From sqlalchemy, a parameter use_threadlocal to always return the same
-- connection when one has been checked out in the thread already.
-- ??? sqlalchemy allows overflows in pools
-- ??? sqlalchemy provides a SingletonThreadPool where a connection is only
-- returned in the thread that was used to create it (for sqlite)
with Ada.Containers.Doubly_Linked_Lists;
use Ada.Containers;
with Ada.Unchecked_Deallocation;
with GNATCOLL.SQL; use GNATCOLL.SQL;
with GNATCOLL.SQL.Orm;
with GNATCOLL.Traces; use GNATCOLL.Traces;
with GNATCOLL.Utils; use GNATCOLL.Utils;
package body GNATCOLL.SQL.Sessions is
Me : constant Trace_Handle := Create ("Session", Off);
Me_Info : constant Trace_Handle := Create ("Session.Info");
use Element_Maps, Weak_Element_Maps, Element_Lists, Pointers;
Default_Fact : Element_Factory := Null_Factory'Access;
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(Detached_Element'Class, Detached_Element_Access);
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(User_Data'Class, User_Data_Access);
function Is_Dirty (Data : Detached_Data_Access) return Boolean;
pragma Inline (Is_Dirty);
-- Return True if Data has been modified in memory, and not synchronized
-- yet with the database
type Null_Element is new Detached_Element with null record;
overriding procedure Insert_Or_Update
(Self : in out Null_Element;
PK_Modified : in out Boolean;
Dirty : Dirty_Mask) is null;
overriding procedure Internal_Delete (Self : Null_Element) is null;
-- A special, always uninitialized element
procedure Clear_Cache (Data : in out Session_Data);
-- Clear the cache, releasing memory as appropriate
function Image (K : Element_Key) return String;
procedure Trace_Debug
(Me : GNATCOLL.Traces.Trace_Handle;
K : Weak_Cache;
Msg : String := "");
procedure Trace_Debug
(Me : GNATCOLL.Traces.Trace_Handle;
E : Detached_Element_Access;
Msg : String := "");
-- Print information on C
package Hash_Lists is new Ada.Containers.Doubly_Linked_Lists
(Ada.Containers.Hash_Type);
use Hash_Lists;
procedure Add_To_Cache (Self : Session_Type; E : Detached_Element'Class);
-- Add the element into the cache. We want the element to outlive the
-- session (so that we can find out all changes when committing the
-- session), so we store a real reference.
-----------------
-- Ref_Or_Weak --
-----------------
function Get_Data (Self : Weak_Cache) return Detached_Data_Access;
function Get_Data
(Self : Detached_Element_Access) return Detached_Data_Access;
pragma Inline (Get_Data);
-- Returned the element data stored in Self
--------------
-- Get_Data --
--------------
function Get_Data (Self : Weak_Cache) return Detached_Data_Access is
begin
return Detached_Data_Access (Get (Self.Ref).Get);
end Get_Data;
--------------
-- Get_Data --
--------------
function Get_Data
(Self : Detached_Element_Access) return Detached_Data_Access is
begin
return Detached_Data_Access (Self.Get);
end Get_Data;
------------------
-- Impl_Factory --
------------------
function Impl_Factory (Data : Pool_Data) return Session_Data is
DB : constant Database_Connection := Data.Descr.Build_Connection;
begin
Assert
(Me, DB /= null,
"Could not connect to database. Wrong dbtype set in settings ?");
return (DB => DB,
Pool => Data.Pool,
Wcache => Weak_Element_Maps.Empty_Map,
Cache => Element_Maps.Empty_Map,
Modified_Elements => Element_Lists.Empty_List,
User => null,
Store_Unmodified => Data.Config_Store_Unmodified,
Weak_Cache => Data.Config_Weak_Cache,
Persist_Cascade => Data.Config_Persist_Cascade,
Flush_Before_Query => Data.Config_Flush_Before_Query,
Factory => Default_Fact);
end Impl_Factory;
----------
-- Free --
----------
procedure Free (Data : in out Pool_Data) is
begin
Free (Data.Descr);
if Data.Config_Default_User_Data /= null then
Free (Data.Config_Default_User_Data.all);
Unchecked_Free (Data.Config_Default_User_Data);
end if;
end Free;
-----------------
-- Clear_Cache --
-----------------
procedure Clear_Cache (Data : in out Session_Data) is
WC : Weak_Element_Maps.Cursor;
WRef : Weak_Cache;
E : Detached_Element_Access;
C : Element_Maps.Cursor;
D : Detached_Data_Access;
begin
if Data.Weak_Cache then
WC := Data.Wcache.First;
while Has_Element (WC) loop
WRef := Element (WC);
if Active (Me) then
Trace_Debug (Me, WRef, "Removed from cache: ");
end if;
-- The element no longer belongs to the session (it might actually
-- be freed by Unchecked_Free, but we do not know that for sure)
D := Get_Data (WRef);
if D /= null then
D.Session := Null_Weak_Session;
end if;
Next (WC);
end loop;
Data.Wcache.Clear;
else
C := Data.Cache.First;
while Has_Element (C) loop
E := Element (C);
if Active (Me) then
Trace_Debug (Me, E, "Removed from cache: ");
end if;
D := Get_Data (E);
if D /= null then
D.Session := Null_Weak_Session;
end if;
Unchecked_Free (E);
Next (C);
end loop;
Data.Cache.Clear;
end if;
Data.Modified_Elements.Clear;
end Clear_Cache;
---------------------
-- Impl_On_Release --
---------------------
procedure Impl_On_Release (Data : in out Session_Data) is
begin
Increase_Indent (Me, "Releasing session in pool "
& Session_Pool'Image (Data.Pool));
Clear_Cache (Data);
if Data.DB.Automatic_Transactions then
Rollback (Data.DB, ""); -- Release any pending transaction
end if;
if Data.User /= null then
Trace (Me, "Freeing session data");
Free (Data.User.all);
Unchecked_Free (Data.User);
end if;
Decrease_Indent (Me, "Done releasing session");
end Impl_On_Release;
---------------
-- Impl_Free --
---------------
procedure Impl_Free (Data : in out Session_Data) is
begin
if Active (Me) then
Trace (Me, "Freeing a session and its cache, closing SQL connection"
& " in pool " & Session_Pool'Image (Data.Pool));
end if;
Clear_Cache (Data); -- Should have been done in Impl_On_Release
Data.Factory := Default_Fact;
Free (Data.DB); -- Close connection
end Impl_Free;
---------------------
-- Get_New_Session --
---------------------
function Get_New_Session
(Pool : Session_Pool := Default_Pool) return Session_Type
is
Self : Session_Type;
begin
if Active (Me) then
Trace (Me, "Getting new session from pool "
& Session_Pool'Image (Pool));
end if;
Impl.Get (Self, Set => Pool);
Reset_Connection (Self.DB);
return Self;
end Get_New_Session;
-----------
-- Setup --
-----------
procedure Setup
(Descr : GNATCOLL.SQL.Exec.Database_Description;
Max_Sessions : Positive;
Default_User_Data : User_Data'Class := No_User_Data;
Store_Unmodified : Boolean := False;
Weak_Cache : Boolean := True;
Flush_Before_Query : Boolean := True;
Persist_Cascade : Boolean := True;
Pool : Session_Pool := Default_Pool)
is
begin
Impl.Set_Factory
(Pool_Data'
(Descr => Descr,
Pool => Pool,
Config_Store_Unmodified => Store_Unmodified,
Config_Weak_Cache => Weak_Cache,
Config_Flush_Before_Query => Flush_Before_Query,
Config_Default_User_Data =>
new User_Data'Class'(Default_User_Data),
Config_Persist_Cascade => Persist_Cascade),
Max_Sessions, Set => Pool);
end Setup;
-------------------------
-- Set_Default_Factory --
-------------------------
procedure Set_Default_Factory (Factory : Element_Factory) is
begin
Default_Fact := Factory;
end Set_Default_Factory;
-----------------
-- Set_Factory --
-----------------
procedure Set_Factory
(Self : in out Session_Type'Class;
Factory : Element_Factory) is
begin
Self.Element.Factory := Factory;
end Set_Factory;
------------------
-- Null_Factory --
------------------
function Null_Factory
(From : Base_Element'Class;
Default : Detached_Element'Class) return Detached_Element'Class
is
pragma Unreferenced (From);
begin
return Default;
end Null_Factory;
-------------
-- Factory --
-------------
function Factory
(Self : Session_Type'Class;
From : Base_Element'Class;
Default : Detached_Element'Class) return Detached_Element'Class is
begin
return Self.Element.Factory (From, Default);
end Factory;
-------------
-- Is_Null --
-------------
function Is_Null (Self : Detached_Element) return Boolean is
begin
return Self.Get = null;
end Is_Null;
----------
-- Free --
----------
overriding procedure Free (Self : in out Detached_Data) is
WC : Weak_Element_Maps.Cursor;
Session : constant Session_Type := Get (Self.Session);
D : access Session_Data;
K : Element_Key;
Template : Detached_Element_Access;
begin
-- This procedure is only called for elements that have a weak-ref (or
-- no ref at all) in a session. If the session is holding a real
-- reference, Self cannot be freed anyway.
-- The goal here is to save memory by removing the element's weak ref
-- from the session cache. This is not mandatory, since the weak ref
-- remains usable, but ensures memory usage does not grow up too much.
-- This will actually free Self, and properly reset all weakref to it.
-- At this point, the weak references in the cache that are no longer
-- pointing to anything can simply be removed.
Free (Weak_Refcounted (Self));
if Session /= No_Session then
D := Session.Element;
if D.Weak_Cache then
K := Key (Detached_Data'Class (Self));
WC := D.Wcache.Find (K);
if Has_Element (WC) then
if Active (Me) then
Trace (Me, "Removing from cache: freed weakref "
& Image (K));
end if;
Template := Element (WC).Template;
Unchecked_Free (Template);
D.Wcache.Delete (WC);
end if;
end if;
end if;
end Free;
-----------
-- Image --
-----------
function Image (K : Element_Key) return String is
begin
return "<" & Image (K.Table, Min_Width => 1)
& ',' & Image (K.Key, Min_Width => 1) & ">";
end Image;
-----------------
-- Trace_Debug --
-----------------
procedure Trace_Debug
(Me : GNATCOLL.Traces.Trace_Handle;
K : Weak_Cache;
Msg : String := "")
is
Data : constant Detached_Data_Access := Get_Data (K);
begin
if Was_Freed (K.Ref) then
Trace (Me, Msg & "weakref to freed '" & Image (Key (Data.all)) & "'");
else
Trace (Me, Msg & "weakref to '" & Image (Key (Data.all)) & "'");
end if;
end Trace_Debug;
-----------------
-- Trace_Debug --
-----------------
procedure Trace_Debug
(Me : GNATCOLL.Traces.Trace_Handle;
E : Detached_Element_Access;
Msg : String := "")
is
Data : constant Detached_Data_Access := Get_Data (E);
Count : Integer;
begin
Count := Get_Refcount (E.all);
if not Active (Me) and then Count /= 1 then
-- Always show when an element has remaining references, since it
-- helps debugging memory issues.
Trace (Me_Info, Msg & " (remaining refs to '"
& Image (Key (Data.all))
& "' refcount=" & Count'Img & ")");
end if;
if Data = null then
Trace (Me, Msg & "ref to <null> refcount=" & Count'Img);
elsif Is_Dirty (Data) then
Trace (Me, Msg & "ref to modified '"
& Image (Key (Data.all))
& "' refcount=" & Count'Img);
else
Trace (Me, Msg & "ref to unmodified '"
& Image (Key (Data.all))
& "' refcount=" & Count'Img);
end if;
end Trace_Debug;
-----------------
-- Trace_Debug --
-----------------
procedure Trace_Debug
(Me : GNATCOLL.Traces.Trace_Handle;
Session : Session_Type;
Msg : String := "")
is
C : Element_Maps.Cursor;
WC : Weak_Element_Maps.Cursor;
begin
Increase_Indent (Me, Msg);
Trace (Me, "Refcount=" & Get_Refcount (Session)'Img);
if Session.Element.Weak_Cache then
WC := Session.Element.Wcache.First;
while Has_Element (WC) loop
Trace_Debug (Me, Element (WC), "");
Next (WC);
end loop;
else
C := Session.Element.Cache.First;
while Has_Element (C) loop
Trace_Debug (Me, Element (C), "");
Next (C);
end loop;
end if;
Decrease_Indent (Me, "Done " & Msg);
exception
when E : others =>
Decrease_Indent (Me, "Done " & Msg & " Unexpected exception");
Trace (Me, E);
end Trace_Debug;
---------
-- "=" --
---------
function "=" (W1, W2 : Weak_Cache) return Boolean is
begin
return W1.Ref = W2.Ref;
end "=";
----------
-- Hash --
----------
function Hash (Key : Element_Key) return Ada.Containers.Hash_Type is
begin
if Key.Key = No_Primary_Key then
return Ada.Containers.Hash_Type (Key.Table);
else
return Ada.Containers.Hash_Type
(Long_Long_Integer (Key.Table + Key.Key)
mod Long_Long_Integer (Hash_Type'Last));
end if;
end Hash;
----------------
-- From_Cache --
----------------
function From_Cache
(Self : Session_Type;
Key : Element_Key;
If_Not_Found : Detached_Element'Class) return Detached_Element'Class
is
D : constant access Session_Data := Self.Element;
C : Element_Maps.Cursor;
WC : Weak_Element_Maps.Cursor;
Wref : Weak_Cache;
begin
if D.Weak_Cache then
-- Find will call Equivalent to find a matching element (after using
-- the Hash to find the bucket).
WC := D.Wcache.Find (Key);
if Has_Element (WC) then
Wref := Weak_Element_Maps.Element (WC);
declare
R : Detached_Element'Class := Wref.Template.all;
begin
Set (R, Get_Data (Wref));
return R;
end;
end if;
else
C := D.Cache.Find (Key);
if Has_Element (C) then
return Element_Maps.Element (C).all;
end if;
end if;
return If_Not_Found;
end From_Cache;
------------------
-- Set_Modified --
------------------
procedure Set_Modified
(Self : Detached_Element; Field : Natural)
is
D : constant Detached_Data_Access := Detached_Data_Access (Self.Get);
Session : Session_Type;
Was_Dirty : constant Boolean := Is_Dirty (D);
begin
if Active (Me) and then not D.Dirty (Field) then
Trace (Me, "Set_Modified, Field=" & Field'Img
& " key=" & Image (Key (D.all))
& " Was_Dirty=" & Was_Dirty'Img);
end if;
D.Dirty (Field) := True;
if not Was_Dirty then
-- Add the element to the list of modified elements. This also
-- ensures we have a real reference to it so that it isn't finalized
-- before we have flushed it to the db.
Session := Get (D.Session);
if Session /= No_Session then
Session.Element.Modified_Elements.Append (Self);
if Active (Me) then
Trace (Me, " Set_Modified: added to session's modified list");
end if;
end if;
-- We do not need to add the element to the cache:
-- either it was retrieved through the session and is already in the
-- cache, or it is a new element which we would not be able to cache
-- anyway.
end if;
end Set_Modified;
--------
-- DB --
--------
function DB (Self : Session_Type) return Database_Connection is
begin
return Self.Element.DB;
end DB;
----------
-- Free --
----------
procedure Free is
begin
Impl.Free;
end Free;
--------------
-- Get_Weak --
--------------
function Get_Weak (Self : Session_Type) return Weak_Session is
W : Impl.Weak_Resource;
begin
W := Impl.Get_Weak (Impl.Resource (Self));
return Weak_Session'(Ref => W);
end Get_Weak;
---------
-- Get --
---------
function Get (Self : Weak_Session) return Session_Type is
Result : Session_Type;
begin
if Impl.Was_Freed (Self.Ref) then
return No_Session;
else
Impl.Get (Self.Ref, Result);
return Result;
end if;
end Get;
-------------
-- Persist --
-------------
procedure Persist
(Self : Session_Type; Element : Detached_Element'Class)
is
D : constant Detached_Data_Access := Detached_Data_Access (Element.Get);
begin
if D = null then
return;
end if;
-- Store a weak-reference to the session in the element, so that it can
-- be used to query further attributes, or register changes
-- The Element can outlive the session, so we store a weak-reference.
if Get (D.Session) /= No_Session then
if Get (D.Session) /= Self then
raise Already_Persistent
with "Element already belongs to another session";
end if;
-- Element is already in the session, but might not be in the cache
-- if it wasn't modified before and Config_Store_Unmodified is False.
-- If it is in the session, and it is dirty, it has already been
-- added to the list of modified elements.
else
D.Session := Get_Weak (Self);
if Is_Dirty (D) then
if Active (Me) then
Trace (Me, "Persisting a modified element: "
& Image (Key (D.all)));
end if;
Self.Element.Modified_Elements.Append (Element);
elsif not Self.Element.Store_Unmodified then
return;
end if;
end if;
Add_To_Cache (Self, Element);
end Persist;
------------------
-- Add_To_Cache --
------------------
procedure Add_To_Cache (Self : Session_Type; E : Detached_Element'Class) is
K : constant Element_Key := Key (Detached_Data_Access (E.Get).all);
T : Detached_Element_Access;
Inserted : Boolean;
C : Element_Maps.Cursor;
WC : Weak_Element_Maps.Cursor;
begin
if K.Key = No_Primary_Key then
-- Can't add an element whose primary key is unknown, since we do not
-- have a unique key for it. But the element has likely been added
-- (via Persist) to the list of Modified_Elements, and when the
-- element is inserted into the database it will also be added to
-- the database automatically).
return;
end if;
if Self.Element.Weak_Cache then
T := new Detached_Element'Class'(E);
Set (T.all, null); -- We only want the template, not a ref
Self.Element.Wcache.Insert
(Key => K,
New_Item => (Ref => Pointers.Get_Weak_Ref (E),
Template => T),
Position => WC,
Inserted => Inserted);
else
T := new Detached_Element'Class'(E);
Self.Element.Cache.Insert
(Key => K, New_Item => T,
Position => C,
Inserted => Inserted);
end if;
if Inserted then
if Active (Me) then
Trace (Me, "Add to cache: " & Image (K));
end if;
On_Persist (E);
else
Unchecked_Free (T);
end if;
end Add_To_Cache;
--------------
-- Is_Dirty --
--------------
function Is_Dirty (Data : Detached_Data_Access) return Boolean is
begin
for D in Data.Dirty'Range loop
if Data.Dirty (D) then
return True;
end if;
end loop;
return False;
end Is_Dirty;
-----------------
-- Cache_Count --
-----------------
procedure Cache_Count
(Self : Session_Type;
Refs : out Natural;
Weakref : out Natural) is
begin
if Self.Element.Weak_Cache then
Weakref := Integer (Length (Self.Element.Wcache));
Refs := 0;
else
Weakref := 0;
Refs := Integer (Length (Self.Element.Cache));
end if;
end Cache_Count;
---------------------
-- Persist_Cascade --
---------------------
function Persist_Cascade (Self : Session_Type) return Boolean is
begin
return Self /= No_Session
and then Self.Element.Persist_Cascade;
end Persist_Cascade;
----------------------
-- Insert_Or_Update --
----------------------
procedure Insert_Or_Update
(Self : Session_Type;
Element : in out Detached_Element'Class)
is
D : constant Detached_Data_Access :=
Detached_Data_Access (Get (Element));
PK_Modified : Boolean := False;
begin
if D = null or else not Is_Dirty (D) then
-- Nothing to do
return;
end if;
if Active (Me) then
Trace_Debug (Me, Element'Unchecked_Access, "Insert_Or_Update: ");
end if;
declare
Dirty : constant Dirty_Mask := D.Dirty;
Old_K : constant Element_Key := Key (D.all);
begin
-- Reset the dirty mask, to prevent infinite recursion when an
-- element depends (possibly indirectly) on itself
D.Dirty := (others => False);
if Dirty (Dirty_Mask_Deleted) then
Internal_Delete (Element);
-- Remove the element from the cache. In theory at least, the
-- element no longer exists
--
-- ??? In theory at least, we should only remove elements last,
-- after all other changes have been done (so that any FK
-- reference to them has been updated). Likewise, we should add
-- elements first).
PK_Modified := True;
else
Insert_Or_Update (Element, PK_Modified, Dirty);
if PK_Modified then
if Active (Me) then
Trace (Me, "PK has changed, adding new value to cache");
end if;
Add_To_Cache (Self, Element); -- Insert with new key
end if;
end if;
if PK_Modified and then Old_K.Key /= No_Primary_Key then
if Active (Me) then
Trace (Me, "PK has changed, removing old from cache: "
& Image (Old_K));
end if;
-- Remove the old element from the cache
if Self.Element.Weak_Cache then
Self.Element.Wcache.Exclude (Old_K);
else
Self.Element.Cache.Exclude (Old_K);
end if;
end if;
end;
end Insert_Or_Update;
------------
-- Delete --
------------
procedure Delete
(Self : Session_Type; Element : Detached_Element'Class)
is
pragma Unreferenced (Self);
begin
Element.Set_Modified (Dirty_Mask_Deleted);
end Delete;
-----------
-- Flush --
-----------
procedure Flush (Self : Session_Type) is
procedure Process (E : in out Detached_Element'Class);
procedure Process (E : in out Detached_Element'Class) is
begin
Insert_Or_Update (Self, E);
end Process;
Data : constant access Session_Data := Self.Element;
C : Element_Lists.Cursor := Data.Modified_Elements.First;
begin
if Has_Element (C) then
Increase_Indent (Me, "Flushing session");
while Has_Element (C) loop
Update_Element (Data.Modified_Elements, C, Process'Access);
Next (C);
end loop;
Data.Modified_Elements.Clear;
Decrease_Indent (Me, "Done flushing session");
end if;
-- ??? The only delicate area is when you have default values set
-- by the database, in which case we might not have the value in
-- memory and will not fetch it next time.
exception
when GNATCOLL.SQL.Orm.Self_Referencing =>
Decrease_Indent (Me, "Got self-referencing");
raise;
when E : others =>
Trace (Me, E, "while flushing session");
Decrease_Indent (Me);
end Flush;
-----------------------
-- Begin_Transaction --
-----------------------
procedure Begin_Transaction (Self : Session_Type) is
begin
if not In_Transaction (Self.DB) then
Execute (Self.DB, SQL_Begin);
end if;
end Begin_Transaction;
--------------------
-- In_Transaction --
--------------------
function In_Transaction (Self : Session_Type) return Boolean is
begin
return In_Transaction (Self.DB);
end In_Transaction;
------------
-- Commit --
------------
procedure Commit (Self : Session_Type) is
begin
Flush (Self);
if In_Transaction (Self.DB) then
Execute (Self.DB, SQL_Commit);
end if;
end Commit;
--------------
-- Rollback --
--------------
procedure Rollback (Self : Session_Type) is
begin
Trace (Me, "Rollback session");
if In_Transaction (Self.DB) then
Execute (Self.DB, SQL_Rollback);
end if;
Clear_Cache (Self.Element.all);
end Rollback;
-------------
-- Session --
-------------
function Session (Self : Detached_Element'Class) return Session_Type is
begin
return Get (Detached_Data_Access (Self.Get).Session);
end Session;
----------------------
-- Get_Weak_Session --
----------------------
function Get_Weak_Session
(Self : Detached_Element'Class) return Weak_Session is
begin
return Detached_Data_Access (Self.Get).Session;
end Get_Weak_Session;
------------------------
-- Flush_Before_Query --
------------------------
function Flush_Before_Query (Self : Session_Type) return Boolean is
begin
return Self.Element.Flush_Before_Query;
end Flush_Before_Query;
---------------------------
-- Set_Default_User_Data --
---------------------------
procedure Set_Default_User_Data
(Default_User_Data : User_Data'Class := No_User_Data;
Pool : Session_Pool := Default_Pool)
is
P : constant access Pool_Data := Impl.Get_Factory_Param (Pool);
begin
Free (P.Config_Default_User_Data.all);
Unchecked_Free (P.Config_Default_User_Data);
P.Config_Default_User_Data := new User_Data'Class'(Default_User_Data);
end Set_Default_User_Data;
-------------------
-- Get_User_Data --
-------------------
function Get_User_Data
(Self : Session_Type; Pool : Session_Pool := Default_Pool)
return access User_Data'Class
is
D : constant access Session_Data := Self.Element;
P : access Pool_Data;
begin
if D.User = null then
P := Impl.Get_Factory_Param (Pool);
if P.Config_Default_User_Data /= null then
D.User := new User_Data'Class'(P.Config_Default_User_Data.all);
end if;
end if;
return D.User;
end Get_User_Data;
------------
-- Delete --
------------
procedure Delete (Element : Detached_Element) is
begin
Element.Session.Delete (Element);
end Delete;
end GNATCOLL.SQL.Sessions;
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