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2129 | ------------------------------------------------------------------------------
-- G N A T C O L L --
-- --
-- Copyright (C) 2005-2022, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- 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/>. --
-- --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Calendar; use Ada.Calendar;
with Ada.Containers.Hashed_Maps; use Ada.Containers;
with Ada.Containers.Hashed_Sets;
with Ada.Strings.Fixed; use Ada.Strings;
with Ada.Strings.Maps.Constants;
with Ada.Strings.Hash;
with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
with Ada.Unchecked_Deallocation;
with GNAT.Strings; use GNAT.Strings;
with GNATCOLL.OS.Constants; use GNATCOLL.OS.Constants;
with GNATCOLL.Plugins; use GNATCOLL.Plugins;
with GNATCOLL.Traces; use GNATCOLL.Traces;
with GNATCOLL.Utils; use GNATCOLL.Utils;
with GNATCOLL.SQL.Exec_Private; use GNATCOLL.SQL.Exec_Private;
with GNATCOLL.SQL.Exec.Tasking; use GNATCOLL.SQL.Exec.Tasking;
with Interfaces.C.Strings;
with System.Address_Image; use System;
with Ada.Unchecked_Conversion;
package body GNATCOLL.SQL.Exec is
Me_Error : constant Trace_Handle := Create ("SQL.ERROR", On);
Me_Select : constant Trace_Handle := Create ("SQL.SELECT", Off);
Me_Cache : constant Trace_Handle := Create ("SQL.CACHE");
Me_Perf : constant Trace_Handle := Create ("SQL.PERF", Off);
Me_Query : constant Trace_Handle := Create ("SQL", Off);
-- Disable by default those streams that tend to output a lot of data in
-- standard applications.
Cache_Expiration_Delay : constant Duration := 3600.0; -- 1 hour
-- Delay after which the SQL cache expires and must be reset
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(Abstract_DBMS_Forward_Cursor'Class, Abstract_Cursor_Access);
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(Prepared_In_Session, Prepared_In_Session_List);
function Is_Select_Query (Query : String) return Boolean;
-- Return true if Query is a select query
function Display_Query
(Query : String;
Prepared : Prepared_Statement'Class := No_Prepared) return String;
-- Return the display for Query (or Prepared, if specified).
-- This is for debug purposes only.
function Prepared_Statement_Name
(Name : String; Cache : Cache_Id) return XString
is
(To_XString
(if Name = "" then "stmt" & Image (Natural (Cache), 0)
else Name));
-- Create prepared statement name either from Name parameter or from
-- Cache_Id if Name is empty.
procedure Execute_And_Log
(Result : in out Forward_Cursor'Class;
Connection : access Database_Connection_Record'Class;
Query : String;
Prepared : Prepared_Statement'Class := No_Prepared;
Direct : Boolean;
Params : SQL_Parameters := No_Parameters);
-- Low-level call to perform a query on the database and log results.
-- The Query parameter is ignored if Prepared is provided.
procedure Fetch_Internal
(Result : out Forward_Cursor'Class;
Connection : access Database_Connection_Record'Class;
Stmt : Prepared_Statement'Class;
Params : SQL_Parameters);
function Hash (Key : Cache_Id) return Ada.Containers.Hash_Type;
package Cached_Maps is new Ada.Containers.Hashed_Maps
(Key_Type => Cache_Id,
Element_Type => Direct_Cursor,
Hash => Hash,
Equivalent_Keys => "=");
-- Cache the results of queries
procedure Compute_And_Prepare_Statement
(Prepared : Prepared_Statement'Class;
Connection : access Database_Connection_Record'Class;
Stmt : out DBMS_Stmt);
-- Format the statement into a string, if not done yet.
function Hash (Key : Database_Connection) return Ada.Containers.Hash_Type;
package Freed_DB_Maps is new Ada.Containers.Hashed_Sets
(Element_Type => Database_Connection,
Hash => Hash,
Equivalent_Elements => "=");
-- List of connections that were freed, so that we no longer try to use
-- them
type Get_Database_Engine_Function is
access function return Database_Engine_Access;
DB_Engines : Database_Engines.Map;
-----------
-- Setup --
-----------
function Setup
(Kind : String;
Options : Name_Values.Map;
Errors : access Error_Reporter'Class) return Database_Description
is
DBP : Plugin := No_Plugin;
CE : Database_Engines.Cursor;
Engine : Database_Engine_Access;
DBE : System.Address;
function To_Function is new Ada.Unchecked_Conversion
(Address, Get_Database_Engine_Function);
begin
CE := DB_Engines.Find (Kind);
if Database_Engines.Has_Element (CE) then
Engine := DB_Engines (CE);
else
DBP := Load ("libgnatcoll_" & Kind & DLL_Ext);
if DBP = No_Plugin then
Trace (Me_Error, "DB plugin load error: " & Last_Error_Message);
return null;
end if;
DBE := Routine_Address (DBP, "db_engine");
if DBE = Null_Address then
Trace
(Me_Error, "Can't bind engine provider: " & Last_Error_Message);
return null;
end if;
Engine := To_Function (DBE).all;
if Engine = null then
Trace (Me_Error, "Can't get engine");
return null;
end if;
Engine.Plugin := DBP;
DB_Engines.Insert (Kind, Engine);
end if;
return Engine.Setup (Options, Errors);
end Setup;
-----------------
-- Query_Cache --
-----------------
protected Query_Cache is
procedure Get_Result
(Stmt : Prepared_Statement'Class;
Cached : out Direct_Cursor;
Found : out Boolean);
-- Return null or the cached value for the statement
procedure Set_Id (Stmt : Prepared_Statement'Class);
-- Set the Cached_Result field of Stmt
procedure Set_Cache
(Stmt : Prepared_Statement'Class; Cached : Forward_Cursor'Class);
-- Add a new value in the cache
procedure Unset_Cache (Stmt : Prepared_Statement_Data);
-- Unset the cache entry for this particular element
procedure Reset;
-- Reset the cache
procedure Mark_DB_As_Free (DB : Database_Connection; Closed : Boolean);
function Was_Freed (DB : Database_Connection) return Boolean;
private
Current_Cache_Id : Cache_Id := 1;
-- First unassigned id for prepared statements
Freed_DB : Freed_DB_Maps.Set;
Cache : Cached_Maps.Map;
Timestamp : Ada.Calendar.Time := Ada.Calendar.Clock;
end Query_Cache;
----------
-- Hash --
----------
function Hash (Key : Cache_Id) return Ada.Containers.Hash_Type is
begin
return Ada.Containers.Hash_Type (Key);
end Hash;
----------
-- Hash --
----------
function Hash (Key : Database_Connection) return Ada.Containers.Hash_Type is
begin
return Ada.Strings.Hash (System.Address_Image (Key.all'Address));
end Hash;
-----------------
-- Query_Cache --
-----------------
protected body Query_Cache is
----------------
-- Get_Result --
----------------
procedure Get_Result
(Stmt : Prepared_Statement'Class;
Cached : out Direct_Cursor;
Found : out Boolean) is
begin
if Clock - Timestamp > Cache_Expiration_Delay then
Reset;
Found := False;
else
declare
C : Cached_Maps.Cursor;
begin
if Stmt.Get.Cached_Result = No_Cache_Id
or else not Stmt.Get.Use_Cache
then
Found := False;
else
C := Cached_Maps.Find (Cache, Stmt.Get.Cached_Result);
Found := Cached_Maps.Has_Element (C);
if Found then
Cached := Task_Safe_Clone (Cached_Maps.Element (C));
end if;
end if;
end;
end if;
exception
when E : others =>
Trace (Me_Cache, E, "Get_Result ");
end Get_Result;
------------
-- Set_Id --
------------
procedure Set_Id (Stmt : Prepared_Statement'Class) is
begin
if not Stmt.Is_Null
and then Stmt.Get.Cached_Result = No_Cache_Id
then
Stmt.Get.Cached_Result := Current_Cache_Id;
Current_Cache_Id := Current_Cache_Id + 1;
end if;
exception
when E : others =>
Trace (Me_Cache, E, "Set_Id ");
end Set_Id;
---------------
-- Set_Cache --
---------------
procedure Set_Cache
(Stmt : Prepared_Statement'Class; Cached : Forward_Cursor'Class)
is
begin
-- Reserve capacity up to the current assigned id, since we are
-- likely to need it anyway, and it is bound to be at least as big
-- as Stmt.Cached.Id
if Stmt.Get.Use_Cache then
Set_Id (Stmt);
Cache.Include
(Stmt.Get.Cached_Result,
Task_Safe_Instance (Cached, Index_By => Stmt.Get.Index_By));
end if;
exception
when E : others =>
Trace (Me_Cache, E, "Set_Cache ");
end Set_Cache;
-----------------
-- Unset_Cache --
-----------------
procedure Unset_Cache (Stmt : Prepared_Statement_Data) is
C : Cached_Maps.Cursor;
begin
if Stmt.Cached_Result /= No_Cache_Id
and then Stmt.Use_Cache
then
C := Cache.Find (Stmt.Cached_Result);
if Cached_Maps.Has_Element (C) then
Trace (Me_Query, "Unset cache for " & Stmt.Name.To_String);
Cache.Delete (C);
end if;
end if;
exception
when E : others =>
Trace (Me_Cache, E, "Unset_Cache ");
end Unset_Cache;
-----------
-- Reset --
-----------
procedure Reset is
begin
Cache.Clear;
Timestamp := Clock;
exception
when E : others =>
Trace (Me_Cache, E, "Reset ");
end Reset;
---------------------
-- Mark_DB_As_Free --
---------------------
procedure Mark_DB_As_Free (DB : Database_Connection; Closed : Boolean) is
begin
if Closed then
Freed_DB.Include (DB);
else
Freed_DB.Exclude (DB);
end if;
exception
when E : others =>
Trace (Me_Cache, E, "Mark_DB_As_Free ");
end Mark_DB_As_Free;
---------------
-- Was_Freed --
---------------
function Was_Freed (DB : Database_Connection) return Boolean is
begin
return Freed_DB.Contains (DB);
exception
when E : others =>
Trace (Me_Cache, E, "Was_Freed ");
return False;
end Was_Freed;
end Query_Cache;
---------------
-- To_String --
---------------
function To_String
(Connection : access Database_Connection_Record;
Stmt : Prepared_Statement'Class)
return String
is
S : constant access Prepared_Statement_Data := Stmt.Unchecked_Get;
begin
if S.Query_Str = null then
S.Query_Str := new String'
(To_String (To_String (S.Query, Connection.all)));
if Active (Me_Query) then
Trace
(Me_Query, "compute (" & S.Name.To_String & "): "
& S.Query_Str.all);
end if;
S.Query := No_Query; -- release memory
S.Is_Select := Is_Select_Query (S.Query_Str.all);
end if;
return S.Query_Str.all;
end To_String;
-----------------------------------
-- Compute_And_Prepare_Statement --
-----------------------------------
procedure Compute_And_Prepare_Statement
(Prepared : Prepared_Statement'Class;
Connection : access Database_Connection_Record'Class;
Stmt : out DBMS_Stmt)
is
L : Prepared_In_Session_List;
-- The side effect is to set S.Query_Str
Str : constant String := To_String (Connection, Prepared);
begin
if Prepared.Get.On_Server
and Is_Prepared_On_Server_Supported (Connection)
then
-- Reuse a prepared statement if one exists for this connection.
L := Prepared.Get.Prepared;
while L /= null loop
exit when L.DB = Database_Connection (Connection);
L := L.Next;
end loop;
if L = null then
L := new Prepared_In_Session'
(Stmt => No_DBMS_Stmt,
DB => Database_Connection (Connection),
DB_Timestamp => Connection.Connected_On,
Next => Prepared.Get.Prepared);
Prepared.Get.Prepared := L;
end if;
-- Else prepare the statement
if L.Stmt = No_DBMS_Stmt
or else L.DB_Timestamp /= Connection.Connected_On
then
L.Stmt := Connect_And_Prepare
(Connection, Str, Prepared.Get.Name.To_String, Direct => True);
-- Set the timestamp *after* we have created the connection, in
-- case it did not exist before (if prepare is the first command
-- done on this connection).
L.DB_Timestamp := Connection.Connected_On;
-- L.Stmt could still be No_DBMS_Stmt if the backend does not
-- support preparation on the server. ??? This means we'll try
-- again next time. For now, all supported DBMS have prepared
-- statement, so that's not an issue.
else
Reset (Connection, L.Stmt);
end if;
Stmt := L.Stmt;
else
Stmt := No_DBMS_Stmt;
end if;
end Compute_And_Prepare_Statement;
-------------------
-- Print_Warning --
-------------------
procedure Print_Warning
(Connection : access Database_Connection_Record'Class; Str : String) is
begin
Trace (Me_Query, Str & " (" & Connection.Username.To_String & ")");
if Connection.Descr.Errors /= null then
Connection.Descr.Errors.On_Warning (Connection, Str);
end if;
end Print_Warning;
-----------------
-- Print_Error --
-----------------
procedure Print_Error
(Connection : access Database_Connection_Record'Class; Str : String) is
begin
Trace (Me_Error, Str & " (" & Connection.Username.To_String & ")");
if Connection.Descr.Errors /= null then
Connection.Descr.Errors.On_Error (Connection, Str);
end if;
end Print_Error;
-------------------------------
-- Report_Database_Corrupted --
-------------------------------
procedure Report_Database_Corrupted
(Connection : access Database_Connection_Record'Class)
is
begin
if Connection.Descr.Errors /= null then
Connection.Descr.Errors.On_Database_Corrupted (Connection);
end if;
Print_Error (Connection, "Error, database is corrupted");
end Report_Database_Corrupted;
----------
-- Free --
----------
procedure Free (Description : in out Database_Description) is
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(Database_Description_Record'Class, Database_Description);
begin
if Description /= null then
-- as documented (in gnatcoll.sql.sqlite.setup), do not free the
-- memory for Errors
Free (Description.all);
Unchecked_Free (Description);
end if;
end Free;
----------------------
-- Check_Connection --
----------------------
function Check_Connection
(Connection : access Database_Connection_Record) return Boolean
is
Success : Boolean;
R : Abstract_Cursor_Access;
begin
if Connection = null then
Trace (Me_Error, "DBMS backend not supported");
return False;
end if;
R := Connect_And_Execute
(Database_Connection (Connection),
Query => "",
Is_Select => False,
Direct => False);
Success := R /= null;
Unchecked_Free (R);
if Success then
Trace (Me_Query, "Init_Database: database successfully initialized");
else
Trace
(Me_Error,
"Init_Database: check_connection FAILED: "
& Error (Database_Connection (Connection)));
end if;
return Success;
end Check_Connection;
---------------------
-- Is_Select_Query --
---------------------
function Is_Select_Query (Query : String) return Boolean is
-- Allow both "SELECT" and "(SELECT" (the latter is used when we do a
-- union between two selects
begin
return Fixed.Index
(Query, "SELECT ", Mapping => Maps.Constants.Upper_Case_Map)
in 1 .. 2;
end Is_Select_Query;
-----------
-- Image --
-----------
function Image
(Format : Formatter'Class; Params : SQL_Parameters)
return String
is
Result : Unbounded_String;
begin
for P in Params'Range loop
Append (Result, ", ");
Append (Result, Params (P).Image (Format));
end loop;
return To_String (Result);
end Image;
-------------------
-- Display_Query --
-------------------
function Display_Query
(Query : String;
Prepared : Prepared_Statement'Class := No_Prepared) return String is
begin
if not Prepared.Is_Null then
return "(" & Prepared.Get.Name.To_String & ")";
else
return Query;
end if;
end Display_Query;
--------------------------
-- Post_Execute_And_Log --
--------------------------
procedure Post_Execute_And_Log
(R : access Abstract_DBMS_Forward_Cursor'Class;
Connection : access Database_Connection_Record'Class;
Query : String;
Prepared : Prepared_Statement'Class := No_Prepared;
Is_Select : Boolean;
Params : SQL_Parameters := No_Parameters)
is
function Get_Rows return String;
-- The number of rows downloaded. If we only have a forward cursor, we
-- can't display them
function Get_User return String;
-- Return the user name
function Get_User return String is
begin
if Connection.Username = Null_XString then
return "";
else
return " (" & Connection.Username.To_String & ")";
end if;
end Get_User;
function Get_Rows return String is
begin
if R.all in DBMS_Direct_Cursor'Class then
return " (" & Image
(Processed_Rows (DBMS_Forward_Cursor'Class (R.all)),
Min_Width => 1) & " tuples)";
elsif Is_Select
and then not Has_Row (DBMS_Forward_Cursor'Class (R.all))
then
return " (no tuples)";
else
-- We cannot count the number of rows, which would require getting
-- all of them.
return "";
end if;
end Get_Rows;
begin
if R = null then
if Active (Me_Error) then
Trace (Me_Error, "Transaction failed (null result): "
& Display_Query (Query, Prepared)
& Image (Connection.all, Params));
end if;
Set_Failure (Connection);
elsif Is_Select then
-- ??? Should use the local mirror database when doing a select,
-- to speed up queries. Are we guaranteed, with the mirror, that
-- doing a INSERT on the master, and immediately a SELECT on the
-- slave will return the newly inserted values ?
Connection.Success := Is_Success (DBMS_Forward_Cursor'Class (R.all));
if not Connection.Success then
if Active (Me_Error) then
Trace (Me_Error, "select failed: "
& Display_Query (Query, Prepared)
& Image (Connection.all, Params)
& " " & Status (DBMS_Forward_Cursor'Class (R.all))
& " " & Error_Msg (DBMS_Forward_Cursor'Class (R.all))
& Get_User);
end if;
Set_Failure (Connection);
elsif Active (Me_Select) then
Trace
(Me_Select,
Display_Query (Query, Prepared)
& Image (Connection.all, Params)
& Get_Rows & " "
& Status (DBMS_Forward_Cursor'Class (R.all)) & Get_User);
end if;
else
Connection.Success := Is_Success (DBMS_Forward_Cursor'Class (R.all));
if not Connection.Success then
if Active (Me_Error) then
-- This trace might duplicate information already available
-- if both the SQL and SQL.ERRORS streams are active (since
-- the result of the SQL has already shown the error message).
-- However, it is useful when only SQL.ERRORS is active.
Trace (Me_Error, "Transaction failed: "
& Display_Query (Query, Prepared)
& Image (Connection.all, Params)
& " " & Status (DBMS_Forward_Cursor'Class (R.all))
& " " & Error_Msg (DBMS_Forward_Cursor'Class (R.all))
& Get_User);
end if;
Set_Failure
(Connection, Error_Msg (DBMS_Forward_Cursor'Class (R.all)));
elsif Active (Me_Query) then
declare
Q : constant String := Display_Query (Query, Prepared);
begin
if Q = "BEGIN" then
Increase_Indent
(Me_Query,
Q & Image (Connection.all, Params)
& Get_Rows & " "
& Status (DBMS_Forward_Cursor'Class (R.all)) & Get_User);
else
Trace
(Me_Query,
Q & Image (Connection.all, Params)
& Get_Rows & " "
& Status (DBMS_Forward_Cursor'Class (R.all)) & Get_User);
end if;
end;
end if;
end if;
end Post_Execute_And_Log;
-----------------------
-- Start_Transaction --
-----------------------
function Start_Transaction
(Connection : access Database_Connection_Record'Class)
return Boolean is
begin
if not Connection.In_Transaction
or else not Connection.Automatic_Transactions
then
Execute (Connection, "BEGIN");
Connection.In_Transaction := True;
return True;
end if;
return False;
end Start_Transaction;
----------------
-- Initialize --
----------------
overriding procedure Initialize (Self : in out Transaction_Controller) is
begin
Self.Started := Self.DB.Start_Transaction;
end Initialize;
--------------
-- Finalize --
--------------
overriding procedure Finalize (Self : in out Transaction_Controller) is
begin
if Self.Started then
Self.DB.Commit_Or_Rollback;
end if;
end Finalize;
---------------------
-- Execute_And_Log --
---------------------
procedure Execute_And_Log
(Result : in out Forward_Cursor'Class;
Connection : access Database_Connection_Record'Class;
Query : String;
Prepared : Prepared_Statement'Class := No_Prepared;
Direct : Boolean;
Params : SQL_Parameters := No_Parameters)
is
Is_Select : Boolean;
Is_Commit_Or_Rollback : Boolean := False;
Stmt : DBMS_Stmt := No_DBMS_Stmt;
R : Abstract_Cursor_Access;
Was_Started : Boolean;
pragma Unreferenced (Was_Started);
Is_Prepared : constant Boolean :=
Prepared /= Prepared_Statement'Class (No_Prepared);
Index_By : Field_Index'Base;
Start : Time;
Q : access String := Query'Unrestricted_Access;
-- Should be safe here, we do not intend to free anything
begin
if Active (Me_Perf) then
Start := Clock;
end if;
if Is_Prepared then
-- Compute the query. We cannot reference the query before
-- that, since it might not have been computed yet.
Compute_And_Prepare_Statement (Prepared, Connection, Stmt);
Is_Select := Prepared.Get.Is_Select;
Q := Prepared.Get.Query_Str;
else
Is_Select := Is_Select_Query (Query);
end if;
if Active (Me_Query) then
Is_Commit_Or_Rollback :=
Equal (Q.all, "commit", Case_Sensitive => False)
or else Equal (Q.all, "rollback", Case_Sensitive => False);
if Is_Commit_Or_Rollback then
Decrease_Indent (Me_Query);
end if;
end if;
-- Transaction management: do we need to start a transaction ?
if Connection.Automatic_Transactions then
if not Is_Select then
Is_Commit_Or_Rollback :=
Equal (Q.all, "commit", Case_Sensitive => False)
or else Equal (Q.all, "rollback", Case_Sensitive => False);
end if;
if Connection.In_Transaction
and then not Connection.Success
then
Trace
(Me_Error,
"Ignored, since transaction in failure: "
& Display_Query (Q.all, Prepared)
& " (" & Connection.Username.To_String & ")");
return;
elsif Equal (Q.all, "begin", Case_Sensitive => False) then
if not Connection.In_Transaction then
Connection.In_Transaction := True;
else
-- Ignore silently: GNATCOLL might have started a transaction
-- without the user knowing, for instance on the first SELECT
-- statement if Always_Use_Transactions is true.
return;
end if;
elsif not Connection.In_Transaction
and then
(Connection.Always_Use_Transactions
or else
(not Is_Commit_Or_Rollback
and then not Is_Select)) -- INSERT, UPDATE, LOCK, DELETE,...
and then
(Q'Length <= 7 -- for sqlite
or else Q (Q'First .. Q'First + 6) /= "PRAGMA ")
and then
(Q'Length <= 7 -- for sqlite
or else Q (Q'First .. Q'First + 6) /= "ANALYZE")
then
-- Start a transaction automatically
Was_Started := Start_Transaction (Connection);
if not Connection.Success then
return;
end if;
end if;
else
if Equal (Q.all, "begin", Case_Sensitive => False) then
Connection.In_Transaction := True;
end if;
end if;
if Perform_Queries then
R := Connect_And_Execute
(Connection => Connection,
Query => Q.all,
Stmt => Stmt,
Is_Select => Is_Select,
Direct => Direct,
Params => Params);
if R = null then
if Active (Me_Error) then
if Stmt /= No_DBMS_Stmt then
Trace (Me_Error, "Failed to execute prepared ("
& Prepared.Get.Name.To_String & ") " & Q.all
& " " & Image (Connection.all, Params)
& " error=" & Error (Connection));
else
Trace (Me_Error, "Failed to execute " & Q.all
& " " & Image (Connection.all, Params)
& " error=" & Error (Connection));
end if;
end if;
Set_Failure (Connection);
else
Index_By := (if Is_Prepared then Prepared.Get.Index_By
else No_Field_Index);
if Direct
and then (R.all not in DBMS_Direct_Cursor'Class
or Index_By /= No_Field_Index)
then
-- DBMS does not support Direct_Cursor or indexed cursor
-- requested. We now need to read all the results and store
-- them into GNATCOLL implemented Direct_Cursor.
declare
R2 : constant Abstract_Cursor_Access :=
Task_Safe_Instance (R, Index_By);
begin
Finalize (DBMS_Forward_Cursor'Class (R.all));
Unchecked_Free (R);
R := R2;
end;
end if;
Post_Execute_And_Log
(R, Connection, Q.all, Prepared, Is_Select, Params);
end if;
Result.Res := R;
end if;
if Connection.Automatic_Transactions
and then Connection.In_Transaction
and then Is_Commit_Or_Rollback
then
Connection.In_Transaction := False;
end if;
if Active (Me_Perf) then
Trace (Me_Perf, "Finished executing query:"
& Duration'Image ((Clock - Start) * 1000.0) & " ms");
end if;
end Execute_And_Log;
-----------------------
-- Insert_And_Get_PK --
-----------------------
function Insert_And_Get_PK
(Connection : access Database_Connection_Record'Class;
Query : GNATCOLL.SQL.SQL_Query;
Params : SQL_Parameters := No_Parameters;
PK : SQL_Field_Integer) return Integer
is
begin
return Insert_And_Get_PK
(Connection, To_String (To_String (Query, Connection.all)),
Params, PK);
end Insert_And_Get_PK;
-----------------------
-- Insert_And_Get_PK --
-----------------------
function Insert_And_Get_PK
(Connection : access Database_Connection_Record;
Query : String;
Params : SQL_Parameters := No_Parameters;
PK : SQL_Field_Integer) return Integer
is
R : Forward_Cursor;
Id : Integer;
begin
Fetch (R, Connection, Query, Params);
Id := Last_Id (R, Connection, PK);
if Active (Me_Query) then
Trace (Me_Query, " => id=" & Id'Img);
end if;
return Id;
end Insert_And_Get_PK;
-----------
-- Fetch --
-----------
procedure Fetch
(Result : out Forward_Cursor;
Connection : access Database_Connection_Record'Class;
Query : String;
Params : SQL_Parameters := No_Parameters) is
begin
Result := No_Element;
Execute_And_Log
(Result, Connection, Query, No_Prepared, Direct => False,
Params => Params);
end Fetch;
-----------
-- Fetch --
-----------
procedure Fetch
(Result : out Forward_Cursor;
Connection : access Database_Connection_Record'Class;
Query : SQL_Query;
Params : SQL_Parameters := No_Parameters) is
begin
Fetch
(Result, Connection, To_String (To_String (Query, Connection.all)),
Params);
end Fetch;
-----------
-- Fetch --
-----------
procedure Fetch
(Result : out Direct_Cursor;
Connection : access Database_Connection_Record'Class;
Query : String;
Params : SQL_Parameters := No_Parameters) is
begin
Result := No_Direct_Element;
Execute_And_Log
(Result, Connection, Query, No_Prepared, Direct => True,
Params => Params);
end Fetch;
-----------
-- Fetch --
-----------
overriding procedure Fetch
(Result : out Direct_Cursor;
Connection : access Database_Connection_Record'Class;
Query : GNATCOLL.SQL.SQL_Query;
Params : SQL_Parameters := No_Parameters) is
begin
Fetch
(Result, Connection, To_String (To_String (Query, Connection.all)),
Params => Params);
end Fetch;
-------------
-- Execute --
-------------
procedure Execute
(Connection : access Database_Connection_Record'Class;
Query : SQL_Query;
Params : SQL_Parameters := No_Parameters)
is
R : Forward_Cursor;
begin
Fetch (R, Connection, Query, Params);
end Execute;
-------------
-- Execute --
-------------
procedure Execute
(Connection : access Database_Connection_Record'Class;
Query : String;
Params : SQL_Parameters := No_Parameters)
is
R : Forward_Cursor;
begin
Fetch (R, Connection, Query, Params);
end Execute;
-------------
-- Success --
-------------
function Success
(Connection : access Database_Connection_Record) return Boolean is
begin
return Connection.Success;
end Success;
-----------------
-- Set_Failure --
-----------------
procedure Set_Failure
(Connection : access Database_Connection_Record'Class;
Error_Msg : String := "") is
begin
Connection.Success := False;
if Connection.Error_Msg = Null_XString then
if Error_Msg /= "" then
Connection.Error_Msg := To_XString (Error_Msg);
else
declare
E : constant String := Error (Connection);
begin
if E /= "" then
Connection.Error_Msg := To_XString (E);
end if;
end;
end if;
end if;
end Set_Failure;
--------------------
-- In_Transaction --
--------------------
function In_Transaction
(Connection : access Database_Connection_Record'Class) return Boolean is
begin
return Connection.In_Transaction;
end In_Transaction;
--------------
-- Rollback --
--------------
procedure Rollback
(Connection : access Database_Connection_Record'Class;
Error_Msg : String := "") is
begin
if Connection.In_Transaction
or else not Connection.Automatic_Transactions
then
Connection.Success := True; -- we are allowed to perform this
Execute (Connection, "ROLLBACK");
Connection.In_Transaction := False;
if Connection.Error_Msg = Null_XString and then Error_Msg /= "" then
Connection.Error_Msg := To_XString (Error_Msg);
end if;
-- A rollback can only fail if the connection to the database
-- was broken. But in that case the transaction is lost anyway,
-- so it behaves as if the rollback had succeeded.
Connection.Success := True;
end if;
end Rollback;
------------------------
-- Commit_Or_Rollback --
------------------------
procedure Commit_Or_Rollback
(Connection : access Database_Connection_Record'Class) is
begin
if Connection.In_Transaction
or else not Connection.Automatic_Transactions
then
if Connection.Success then
Execute (Connection, "COMMIT");
else
Rollback (Connection);
-- Still marked as failed, since the transaction was never
-- performed.
Connection.Success := False;
end if;
Connection.In_Transaction := False;
end if;
end Commit_Or_Rollback;
----------------------
-- Invalidate_Cache --
----------------------
procedure Invalidate_Cache is
begin
Trace (Me_Query, "Invalidate SQL cache");
Query_Cache.Reset;
end Invalidate_Cache;
----------------------
-- Reset_Connection --
----------------------
procedure Reset_Connection
(Connection : access Database_Connection_Record'Class;
Username : String := "") is
begin
if Connection.In_Transaction then
Rollback (Connection); -- In case a previous thread had started on
end if;
Connection.Success := True;
Connection.Automatic_Transactions := True;
if Username /= "" or else Connection.Username = Null_XString then
Connection.Username := To_XString (Username);
end if;
Connection.Error_Msg := Null_XString;
end Reset_Connection;
------------------------
-- Last_Error_Message --
------------------------
function Last_Error_Message
(Connection : access Database_Connection_Record'Class) return String is
begin
return Connection.Error_Msg.To_String;
end Last_Error_Message;
------------
-- Adjust --
------------
overriding procedure Adjust (Self : in out Forward_Cursor) is
begin
if Self.Res /= null then
Self.Res.Refcount := Self.Res.Refcount + 1;
end if;
end Adjust;
--------------
-- Finalize --
--------------
overriding procedure Finalize (Self : in out Forward_Cursor) is
Res : Abstract_Cursor_Access := Self.Res;
begin
Self.Res := null; -- Make Finalize idempotent
if Res /= null then
Res.Refcount := Res.Refcount - 1;
if Res.Refcount = 0 then
Finalize (DBMS_Forward_Cursor'Class (Res.all));
Unchecked_Free (Res);
end if;
end if;
end Finalize;
--------------------
-- Processed_Rows --
--------------------
function Processed_Rows (Self : Forward_Cursor) return Natural is
begin
if Self.Res = null then
return 0;
else
return Processed_Rows (DBMS_Forward_Cursor'Class (Self.Res.all));
end if;
end Processed_Rows;
-------------
-- Has_Row --
-------------
function Has_Row (Self : Forward_Cursor) return Boolean is
begin
if Self.Res = null then
return False;
else
return Has_Row (DBMS_Forward_Cursor'Class (Self.Res.all));
end if;
end Has_Row;
----------
-- Next --
----------
procedure Next (Self : in out Forward_Cursor) is
begin
if Self.Res /= null then
Next (DBMS_Forward_Cursor'Class (Self.Res.all));
end if;
end Next;
-----------
-- Value --
-----------
function Value
(Self : Forward_Cursor;
Field : Field_Index) return String is
begin
return Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Value;
---------------------
-- Unbounded_Value --
---------------------
function Unbounded_Value
(Self : Forward_Cursor; Field : Field_Index) return Unbounded_String is
begin
return Unbounded_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Unbounded_Value;
-------------------
-- XString_Value --
-------------------
function XString_Value
(Self : Forward_Cursor; Field : Field_Index) return XString is
begin
return XString_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end XString_Value;
-------------------
-- Boolean_Value --
-------------------
function Boolean_Value
(Self : Forward_Cursor;
Field : Field_Index) return Boolean is
begin
return Boolean_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Boolean_Value;
-------------------
-- Integer_Value --
-------------------
function Integer_Value
(Self : Forward_Cursor;
Field : Field_Index) return Integer
is
begin
return Integer_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Integer_Value;
-------------------
-- Integer_Value --
-------------------
function Integer_Value
(Self : Forward_Cursor;
Field : Field_Index;
Default : Integer) return Integer
is
begin
return Integer_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
exception
when Constraint_Error | Interfaces.C.Strings.Dereference_Error =>
return Default;
end Integer_Value;
------------------
-- Bigint_Value --
------------------
function Bigint_Value
(Self : Forward_Cursor;
Field : Field_Index) return Long_Long_Integer
is
begin
return Bigint_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Bigint_Value;
------------------
-- Bigint_Value --
------------------
function Bigint_Value
(Self : Forward_Cursor;
Field : Field_Index;
Default : Long_Long_Integer) return Long_Long_Integer
is
begin
return Bigint_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
exception
when Constraint_Error | Interfaces.C.Strings.Dereference_Error =>
return Default;
end Bigint_Value;
-----------------
-- Float_Value --
-----------------
function Float_Value
(Self : Forward_Cursor;
Field : Field_Index) return Float is
begin
return Float_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Float_Value;
function Float_Value
(Self : Forward_Cursor;
Field : Field_Index;
Default : Float) return Float is
begin
return Float_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
exception
when Constraint_Error | Interfaces.C.Strings.Dereference_Error =>
return Default;
end Float_Value;
----------------------
-- Long_Float_Value --
----------------------
function Long_Float_Value
(Self : Forward_Cursor; Field : Field_Index) return Long_Float is
begin
return Long_Float_Value
(DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Long_Float_Value;
function Long_Float_Value
(Self : Forward_Cursor;
Field : Field_Index;
Default : Long_Float) return Long_Float is
begin
return Long_Float_Value
(DBMS_Forward_Cursor'Class (Self.Res.all), Field);
exception
when Constraint_Error | Interfaces.C.Strings.Dereference_Error =>
return Default;
end Long_Float_Value;
-----------
-- Value --
-----------
function Money_Value
(Self : Forward_Cursor; Field : Field_Index)
return T_Money is
begin
return Money_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Money_Value;
----------------
-- Time_Value --
----------------
function Time_Value
(Self : Forward_Cursor;
Field : Field_Index) return Ada.Calendar.Time is
begin
return Time_Value (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Time_Value;
-------------
-- Is_Null --
-------------
function Is_Null
(Self : Forward_Cursor;
Field : Field_Index) return Boolean is
begin
return Is_Null (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Is_Null;
-------------
-- Last_Id --
-------------
function Last_Id
(Self : Forward_Cursor;
Connection : access Database_Connection_Record'Class;
Field : SQL_Field_Integer) return Integer is
begin
if Perform_Queries then
if Self.Res = null then
return -1;
else
return Last_Id
(DBMS_Forward_Cursor'Class (Self.Res.all), Connection, Field);
end if;
else
return 1; -- Dummy
end if;
end Last_Id;
---------------------
-- Get_Description --
---------------------
function Get_Description
(Connection : access Database_Connection_Record'Class)
return Database_Description
is
begin
return Database_Description (Connection.Descr);
end Get_Description;
-----------------
-- Field_Count --
-----------------
function Field_Count (Self : Forward_Cursor) return Field_Index is
begin
return Field_Count (DBMS_Forward_Cursor'Class (Self.Res.all));
end Field_Count;
----------------
-- Field_Name --
----------------
function Field_Name
(Self : Forward_Cursor; Field : Field_Index) return String is
begin
return Field_Name (DBMS_Forward_Cursor'Class (Self.Res.all), Field);
end Field_Name;
-----------
-- First --
-----------
procedure First (Self : in out Direct_Cursor) is
begin
First (DBMS_Direct_Cursor'Class (Self.Res.all));
end First;
-------------
-- Current --
-------------
function Current (Self : Forward_Cursor) return Positive is
begin
return Current (DBMS_Forward_Cursor'Class (Self.Res.all));
end Current;
----------
-- Last --
----------
procedure Last (Self : in out Direct_Cursor) is
begin
Last (DBMS_Direct_Cursor'Class (Self.Res.all));
end Last;
--------------
-- Absolute --
--------------
procedure Absolute (Self : in out Direct_Cursor; Row : Positive) is
begin
Absolute (DBMS_Direct_Cursor'Class (Self.Res.all), Row);
end Absolute;
--------------
-- Relative --
--------------
procedure Relative (Self : in out Direct_Cursor; Step : Integer) is
begin
Relative (DBMS_Direct_Cursor'Class (Self.Res.all), Step);
end Relative;
----------
-- Find --
----------
procedure Find (Self : in out Direct_Cursor; Value : Integer) is
begin
Find (Self, Image (Value, Min_Width => 0));
end Find;
procedure Find (Self : in out Direct_Cursor; Value : String) is
begin
Tasking.Find (Self.Res, Value);
end Find;
--------------------
-- Mark_As_Closed --
--------------------
procedure Mark_As_Closed
(Connection : access Database_Connection_Record'Class;
Closed : Boolean) is
begin
Query_Cache.Mark_DB_As_Free (Database_Connection (Connection), Closed);
end Mark_As_Closed;
----------------
-- Was_Closed --
----------------
function Was_Closed
(Connection : access Database_Connection_Record'Class) return Boolean is
begin
return Query_Cache.Was_Freed (Database_Connection (Connection));
end Was_Closed;
----------
-- Free --
----------
procedure Free (Connection : in out Database_Connection) is
procedure Unchecked_Free is new Ada.Unchecked_Deallocation
(Database_Connection_Record'Class, Database_Connection);
begin
if Connection /= null then
Close (Connection);
Mark_As_Closed (Connection, Closed => True);
Unchecked_Free (Connection);
end if;
end Free;
-------------
-- Prepare --
-------------
function Prepare
(Query : SQL_Query;
Auto_Complete : Boolean := False;
Use_Cache : Boolean := False;
On_Server : Boolean := False;
Index_By : Field_Index'Base := No_Field_Index;
Name : String := "") return Prepared_Statement
is
Stmt : Prepared_Statement;
Ptr : Prepared_Statements.Element_Access;
begin
Stmt.Set
(Prepared_Statement_Data'
(Query => Query,
Query_Str => null, -- Computed later
Is_Select => False, -- Computed later
Use_Cache => Use_Cache,
Cached_Result => No_Cache_Id,
Index_By => Index_By,
On_Server => On_Server,
Name => Null_XString,
Prepared => null));
Query_Cache.Set_Id (Stmt);
Ptr := Stmt.Unchecked_Get;
Ptr.Name := Prepared_Statement_Name (Name, Ptr.Cached_Result);
if Auto_Complete then
GNATCOLL.SQL.Auto_Complete (Ptr.Query);
end if;
return Stmt;
end Prepare;
-------------
-- Prepare --
-------------
function Prepare
(Query : String;
Use_Cache : Boolean := False;
On_Server : Boolean := False;
Index_By : Field_Index'Base := No_Field_Index;
Name : String := "") return Prepared_Statement
is
Stmt : Prepared_Statement;
Ptr : Prepared_Statements.Element_Access;
begin
if Active (Me_Query) then
Trace (Me_Query, "compute (" & Name & "): " & Query);
end if;
Stmt.Set
(Prepared_Statement_Data'
(Query => No_Query,
Query_Str => new String'(Query),
Is_Select => Is_Select_Query (Query),
Use_Cache => Use_Cache,
Cached_Result => No_Cache_Id,
Index_By => Index_By,
On_Server => On_Server,
Name => Null_XString,
Prepared => null));
Query_Cache.Set_Id (Stmt);
Ptr := Stmt.Unchecked_Get;
Ptr.Name := Prepared_Statement_Name (Name, Ptr.Cached_Result);
return Stmt;
end Prepare;
-----------------
-- Clear_Cache --
-----------------
procedure Clear_Cache (Stmt : Prepared_Statement) is
begin
Query_Cache.Unset_Cache (Stmt.Get);
end Clear_Cache;
--------------------
-- Fetch_Internal --
--------------------
procedure Fetch_Internal
(Result : out Forward_Cursor'Class;
Connection : access Database_Connection_Record'Class;
Stmt : Prepared_Statement'Class;
Params : SQL_Parameters)
is
Direct : constant Boolean := Result in Direct_Cursor'Class;
Found : Boolean;
procedure Put_Result (Item : Forward_Cursor'Class);
procedure Put_Result (Item : Forward_Cursor'Class) is
begin
if Direct then
Direct_Cursor (Result) := Direct_Cursor (Item);
else
Forward_Cursor (Result) := Forward_Cursor (Item);
end if;
end Put_Result;
begin
Put_Result (No_Direct_Element);
if Stmt.Is_Null then
Trace (Me_Error, "Prepared statement was freed, can't execute");
return;
end if;
if Stmt.Get.Use_Cache
and then Connection.Descr.Caching
and then Params = No_Parameters -- Parameters not supported for now
then
declare
RC : Direct_Cursor;
begin
Query_Cache.Get_Result (Stmt, RC, Found);
if Found then
if Active (Me_Cache) then
Trace (Me_Cache, "(" & Stmt.Get.Name.To_String
& "): from cache");
end if;
Put_Result (RC);
return;
end if;
end;
declare
RE : Forward_Cursor;
begin
-- for the caching do not need the Direct cursor, because it have
-- to be translated into cache task safe anyway.
Execute_And_Log
(RE, Connection, "", Stmt, Direct => False, Params => Params);
if Success (Connection) then
Query_Cache.Set_Cache (Stmt, RE);
-- Recursive reuse get from cache code of this routine
Fetch_Internal (Result, Connection, Stmt, Params);
elsif Direct then
-- Just to return error in direct cursor type
Put_Result (Task_Safe_Instance (RE, Stmt.Get.Index_By));
else
-- Just to return error
Put_Result (RE);
end if;
return;
end;
end if; -- Cache processing
Execute_And_Log
(Result, Connection, "", Stmt, Direct => Direct, Params => Params);
end Fetch_Internal;
-----------
-- Fetch --
-----------
procedure Fetch
(Result : out Direct_Cursor;
Connection : access Database_Connection_Record'Class;
Stmt : Prepared_Statement'Class;
Params : SQL_Parameters := No_Parameters) is
begin
Fetch_Internal (Result, Connection, Stmt, Params);
end Fetch;
-----------
-- Fetch --
-----------
procedure Fetch
(Result : out Forward_Cursor;
Connection : access Database_Connection_Record'Class;
Stmt : Prepared_Statement'Class;
Params : SQL_Parameters := No_Parameters) is
begin
Fetch_Internal (Result, Connection, Stmt, Params);
end Fetch;
-----------------------
-- Insert_And_Get_PK --
-----------------------
function Insert_And_Get_PK
(Connection : access Database_Connection_Record;
Stmt : Prepared_Statement'Class;
Params : SQL_Parameters := No_Parameters;
PK : SQL_Field_Integer) return Integer
is
Result : Forward_Cursor;
Id : Integer;
begin
Execute_And_Log
(Result, Connection, "", Stmt, Direct => False, Params => Params);
Id := Last_Id (Result, Connection, PK);
if Active (Me_Query) then
Trace (Me_Query, " => id=" & Id'Img);
end if;
return Id;
end Insert_And_Get_PK;
-------------
-- Execute --
-------------
procedure Execute
(Connection : access Database_Connection_Record'Class;
Stmt : Prepared_Statement'Class;
Params : SQL_Parameters := No_Parameters)
is
R : Forward_Cursor;
begin
Fetch (R, Connection, Stmt, Params);
end Execute;
-------------------------
-- Connect_And_Prepare --
-------------------------
function Connect_And_Prepare
(Connection : access Database_Connection_Record;
Query : String;
Name : String;
Direct : Boolean)
return DBMS_Stmt
is
pragma Unreferenced (Connection, Query, Direct, Name);
begin
return No_DBMS_Stmt;
end Connect_And_Prepare;
-------------
-- Execute --
-------------
function Execute
(Connection : access Database_Connection_Record;
Prepared : DBMS_Stmt;
Is_Select : Boolean;
Direct : Boolean;
Params : SQL_Parameters := No_Parameters)
return Abstract_Cursor_Access
is
pragma Unreferenced (Connection, Prepared, Is_Select, Direct, Params);
begin
return null;
end Execute;
---------
-- "+" --
---------
function "+" (Value : access constant String) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Text;
begin
P.Str_Ptr := Value.all'Unrestricted_Access;
P.Make_Copy := False;
R.Set (P);
return R;
end "+";
function "+" (Value : String) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Text;
begin
P.Str_Val := To_Unbounded_String (Value);
P.Make_Copy := False;
R.Set (P);
return R;
end "+";
function "+" (Value : Unbounded_String) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Text;
begin
P.Str_Val := Value;
P.Make_Copy := False;
R.Set (P);
return R;
end "+";
----------
-- Copy --
----------
function Copy (Value : access constant String) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Text;
begin
P.Str_Ptr := Value.all'Unrestricted_Access;
P.Make_Copy := True;
R.Set (P);
return R;
end Copy;
---------
-- "+" --
---------
function "+" (Value : Integer) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Integer;
begin
P.Val := Value;
R.Set (P);
return R;
end "+";
---------------
-- As_Bigint --
---------------
function As_Bigint (Value : Long_Long_Integer) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Bigint;
begin
P.Val := Value;
R.Set (P);
return R;
end As_Bigint;
---------
-- "+" --
---------
function "+" (Value : Boolean) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Boolean;
begin
P.Val := Value;
R.Set (P);
return R;
end "+";
---------
-- "+" --
---------
function "+" (Value : Float) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Float;
begin
P.Val := Value;
R.Set (P);
return R;
end "+";
-------------------
-- As_Long_Float --
-------------------
function As_Long_Float (Value : Long_Float) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Long_Float;
begin
P.Val := Value;
R.Set (P);
return R;
end As_Long_Float;
---------
-- "+" --
---------
function "+" (Value : Character) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Character;
begin
P.Char_Val := Value;
R.Set (P);
return R;
end "+";
---------
-- "+" --
---------
function "+" (Time : Ada.Calendar.Time) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Time;
begin
P.Val := Time;
R.Set (P);
return R;
end "+";
---------
-- "+" --
---------
function "+" (Value : T_Money) return SQL_Parameter is
R : SQL_Parameter;
P : SQL_Parameter_Money;
begin
P.Val := Value;
R.Set (P);
return R;
end "+";
----------
-- Free --
----------
procedure Free (Self : in out Prepared_Statement_Data) is
L, L2 : Prepared_In_Session_List;
Count : Natural := 0;
begin
-- If there is a single DB, we are in one of two cases:
-- - either the stmt was local to a procedure, and we are finalizing
-- on exit of the procedure. It is thus safe to use the DB.
-- - or we have a global variable that was only used from a single
-- connection. Since the application is finalizing, we can use the
-- session if it is still valid
-- If there are more than one DB, we have a global variable and the
-- application is finalizing. Don't do anything on the DBMS, just free
-- memory.
if Self.Prepared /= null
and then Self.Prepared.Next = null
then
if Active (Me_Query) then
Trace
(Me_Query, "Finalize stmt on server: " & Self.Name.To_String);
end if;
if not Query_Cache.Was_Freed (Self.Prepared.DB) then
Finalize (Self.Prepared.DB, Self.Prepared.Stmt);
end if;
Unchecked_Free (Self.Prepared);
elsif Self.Prepared /= null then
L := Self.Prepared;
while L /= null loop
L2 := L.Next;
Unchecked_Free (L);
Count := Count + 1;
L := L2;
end loop;
if Active (Me_Query) then
Trace (Me_Query, "Finalize stmt on server: " & Self.Name.To_String
& " (for" & Count'Img & " connections)");
end if;
end if;
Query_Cache.Unset_Cache (Self);
Free (Self.Query_Str);
end Free;
----------------------------
-- Automatic_Transactions --
----------------------------
procedure Automatic_Transactions
(Connection : access Database_Connection_Record'Class;
Active : Boolean := True) is
begin
Connection.Automatic_Transactions := Active;
end Automatic_Transactions;
----------------------------
-- Automatic_Transactions --
----------------------------
function Automatic_Transactions
(Connection : access Database_Connection_Record'Class) return Boolean
is
begin
return Connection.Automatic_Transactions;
end Automatic_Transactions;
-------------------------------------
-- Is_Prepared_On_Server_Supported --
-------------------------------------
function Is_Prepared_On_Server_Supported
(Connection : access Database_Connection_Record) return Boolean
is
pragma Unreferenced (Connection);
begin
return True;
end Is_Prepared_On_Server_Supported;
---------------------------
-- Is_Prepared_On_Server --
---------------------------
function Is_Prepared_On_Server (Stmt : Prepared_Statement) return Boolean is
use type Prepared_Statements.Element_Access;
Ref : constant Prepared_Statements.Element_Access := Stmt.Unchecked_Get;
begin
return Ref /= null and then Ref.Prepared /= null
and then Ref.Prepared.Stmt /= No_DBMS_Stmt;
end Is_Prepared_On_Server;
end GNATCOLL.SQL.Exec;
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