/usr/share/ada/adainclude/gnatcoll/gnatcoll-sql-exec-tasking.adb is in libgnatcoll16.1.0-dev 17.0.2017-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 | ------------------------------------------------------------------------------
-- G N A T C O L L --
-- --
-- Copyright (C) 2005-2017, 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/>. --
-- --
------------------------------------------------------------------------------
pragma Ada_2012;
with Ada.Containers.Indefinite_Hashed_Maps;
with Ada.Containers.Indefinite_Vectors;
with Ada.Finalization;
with Ada.Task_Attributes;
with Ada.Strings.Unbounded.Hash; use Ada.Strings.Unbounded;
with Ada.Task_Identification; use Ada.Task_Identification;
with GNATCOLL.Traces; use GNATCOLL.Traces;
with GNATCOLL.Refcount; use GNATCOLL.Refcount;
with GNATCOLL.SQL.Exec_Private; use GNATCOLL.SQL.Exec_Private;
with Interfaces.C.Strings; use Interfaces.C.Strings;
package body GNATCOLL.SQL.Exec.Tasking is
use type Ada.Containers.Count_Type;
Me_Error : constant Trace_Handle := Create ("SQL.ERROR", On);
package DB_Attributes is new Ada.Task_Attributes
(Database_Connection, null);
-------------------------
-- Get_Task_Connection --
-------------------------
function Get_Task_Connection
(Description : Database_Description;
Username : String := "")
return Database_Connection
is
Connection : Database_Connection;
begin
Connection := DB_Attributes.Value;
if Connection = null then
Connection := Description.Build_Connection;
if Connection /= null then
DB_Attributes.Set_Value (Connection);
else
Trace
(Me_Error, "Could not create connection object for database");
end if;
else
Reset_Connection (Connection, Username);
end if;
return Connection;
end Get_Task_Connection;
---------------------------------------
-- Task safe cursors implementation --
---------------------------------------
type Field_Value is record
Element : Unbounded_String;
Empty : Boolean := False;
end record;
type Record_Type is array (Field_Index range <>) of Field_Value;
package Data_Set_Vectors is
new Ada.Containers.Indefinite_Vectors (Natural, Record_Type);
-- Zero index is for field names
package String_Indexes is new Ada.Containers.Indefinite_Hashed_Maps
(Unbounded_String, Positive, Hash, Equivalent_Keys => "=");
type Data_Set is record
Table : Data_Set_Vectors.Vector;
Index : String_Indexes.Map;
Error : Unbounded_String;
Status : Unbounded_String;
TID : Task_Id; -- Keep the Task ID where the cursor is filled
Success : Boolean;
end record;
package Data_Set_Pointers is new Shared_Pointers (Data_Set);
type Task_Cursor is new DBMS_Direct_Cursor with record
Position : Natural := 1;
Data : Data_Set_Pointers.Ref;
end record;
overriding function Is_Success (Self : Task_Cursor) return Boolean
is (Self.Data.Get.Success);
overriding function Is_Null
(Self : Task_Cursor; Field : Field_Index) return Boolean
is (Self.Data.Get.Table (Self.Position) (Field).Empty);
overriding function Error_Msg (Self : Task_Cursor) return String
is (To_String (Self.Data.Get.Error));
overriding function Status (Self : Task_Cursor) return String
is (To_String (Self.Data.Get.Status));
overriding function Has_Row (Self : Task_Cursor) return Boolean
is (Self.Position <= Self.Data.Get.Table.Last_Index);
overriding function Processed_Rows (Self : Task_Cursor) return Natural
is (Self.Data.Get.Table.Last_Index);
overriding function Current (Self : Task_Cursor) return Positive
is (Self.Position);
overriding function Field_Name
(Self : Task_Cursor; Field : Field_Index) return String
is (To_String (Self.Data.Get.Table (0) (Field).Element));
overriding function Field_Count (Self : Task_Cursor) return Field_Index
is (Self.Data.Get.Table (0).Element'Length);
overriding procedure Next (Self : in out Task_Cursor);
overriding function C_Value
(Self : Task_Cursor; Field : Field_Index) return chars_ptr;
overriding function Last_Id
(Self : Task_Cursor;
Connection : access Database_Connection_Record'Class;
Field : SQL_Field_Integer) return Integer;
overriding procedure First (Self : in out Task_Cursor);
overriding procedure Last (Self : in out Task_Cursor);
overriding procedure Absolute (Self : in out Task_Cursor; Row : Positive);
overriding procedure Relative (Self : in out Task_Cursor; Step : Integer);
overriding function Value
(Self : Task_Cursor; Field : Field_Index) return String;
overriding function Unbounded_Value
(Self : Task_Cursor; Field : Field_Index) return Unbounded_String;
overriding function Boolean_Value
(Self : Task_Cursor; Field : Field_Index) return Boolean;
type Task_Cursor_Access is access all Task_Cursor;
----------
-- Next --
----------
overriding procedure Next (Self : in out Task_Cursor) is
begin
Self.Position := Self.Position + 1;
end Next;
-------------
-- C_Value --
-------------
overriding function C_Value
(Self : Task_Cursor; Field : Field_Index) return chars_ptr
is
pragma Unreferenced (Self, Field);
begin
raise Program_Error with
"Should not be used, because all data in Ada strings already";
return Null_Ptr;
end C_Value;
-------------------
-- Boolean_Value --
-------------------
overriding function Boolean_Value
(Self : Task_Cursor; Field : Field_Index) return Boolean
is
Value : constant String := Self.Value (Field);
begin
return Value'Length > 0
and then (Value (Value'First) = 't'
or else Value (Value'First) = 'T'
or else Value (Value'First) in '1' .. '9');
end Boolean_Value;
-------------
-- Last_Id --
-------------
overriding function Last_Id
(Self : Task_Cursor;
Connection : access Database_Connection_Record'Class;
Field : SQL_Field_Integer) return Integer
is
pragma Unreferenced (Self, Field);
begin
raise Program_Error with
"Task safe cursors is not supported for insert statements";
return 0;
end Last_Id;
-----------
-- First --
-----------
overriding procedure First (Self : in out Task_Cursor) is
begin
Self.Position := 1;
end First;
----------
-- Last --
----------
overriding procedure Last (Self : in out Task_Cursor) is
begin
Self.Position := Self.Data.Get.Table.Last_Index;
end Last;
--------------
-- Absolute --
--------------
overriding procedure Absolute (Self : in out Task_Cursor; Row : Positive) is
begin
Self.Position := Row;
end Absolute;
--------------
-- Relative --
--------------
overriding procedure Relative (Self : in out Task_Cursor; Step : Integer) is
begin
Self.Position := Self.Position + Step;
end Relative;
----------
-- Find --
----------
procedure Find (Self : Abstract_Cursor_Access; Value : String) is
TC : Task_Cursor_Access;
C : String_Indexes.Cursor;
Not_Indexed : constant String := "Cursor is not indexed.";
begin
if Self.all not in Task_Cursor'Class then
raise Constraint_Error with Not_Indexed;
end if;
TC := Task_Cursor_Access (Self);
if TC.Data.Get.Index.Length = 0
and then TC.Data.Get.Table.Length > 0
then
raise Constraint_Error with Not_Indexed;
end if;
C := TC.Data.Get.Index.Find (To_Unbounded_String (Value));
if String_Indexes.Has_Element (C) then
TC.Position := String_Indexes.Element (C);
else
TC.Position := TC.Data.Get.Table.Last_Index + 1;
end if;
end Find;
-----------
-- Value --
-----------
overriding function Value
(Self : Task_Cursor; Field : Field_Index) return String is
begin
return To_String (Self.Data.Get.Table (Self.Position) (Field).Element);
end Value;
---------------------
-- Unbounded_Value --
---------------------
overriding function Unbounded_Value
(Self : Task_Cursor; Field : Field_Index) return Unbounded_String is
begin
return Self.Data.Get.Table (Self.Position) (Field).Element;
end Unbounded_Value;
------------------------
-- Task_Safe_Instance --
------------------------
function Task_Safe_Instance
(Source : Abstract_Cursor_Access;
Index_By : Field_Index'Base := No_Field_Index)
return Abstract_Cursor_Access
is
Src : DBMS_Forward_Cursor'Class renames
DBMS_Forward_Cursor'Class (Source.all);
Result : Task_Cursor_Access;
Row : Record_Type (Field_Index'First
.. Src.Field_Count + Field_Index'First - 1);
procedure Append_Index_Element (Row : Positive);
--------------------------
-- Append_Index_Element --
--------------------------
procedure Append_Index_Element (Row : Positive) is
CS : String_Indexes.Cursor;
OK : Boolean;
Ref : constant Data_Set_Pointers.Reference_Type := Result.Data.Get;
begin
Ref.Index.Insert (Ref.Table (Row)(Index_By).Element, Row, CS, OK);
if not OK then
Trace
(Me_Error,
"Field " & Src.Field_Name (Index_By) & " value "
& To_String (Ref.Table (Row)(Index_By).Element)
& " is not unique. Not all records indexed.");
-- We could support a few records response on one Find call
-- over the Next after Find.
end if;
end Append_Index_Element;
begin
if Source.all in Task_Cursor'Class then
Result := Task_Cursor_Access (Source);
if Index_By >= Field_Index'First
and then Result.Data.Get.Index.Is_Empty
then
for J in 1 .. Result.Data.Get.Table.Last_Index loop
Append_Index_Element (J);
end loop;
end if;
return Source;
end if;
Result := new Task_Cursor;
Result.Data.Set (Data_Set'
(Error => To_Unbounded_String (Src.Error_Msg),
Status => To_Unbounded_String (Src.Status),
Success => Src.Is_Success,
TID => Current_Task,
Table => <>,
Index => <>));
for J in Row'Range loop
Set_Unbounded_String (Row (J).Element, Src.Field_Name (J));
end loop;
Result.Data.Get.Table.Append (Row);
while Src.Has_Row loop
for J in Row'Range loop
if Src.Is_Null (J) then
Row (J) := (Null_Unbounded_String, True);
else
Set_Unbounded_String (Row (J).Element, Src.Value (J));
Row (J).Empty := False;
end if;
end loop;
Result.Data.Get.Table.Append (Row);
if Index_By >= Field_Index'First then
Append_Index_Element (Result.Data.Get.Table.Last_Index);
end if;
Src.Next;
end loop;
if Src in DBMS_Direct_Cursor'Class then
First (DBMS_Direct_Cursor'Class (Src));
end if;
return Abstract_Cursor_Access (Result);
end Task_Safe_Instance;
function Task_Safe_Instance
(Source : Forward_Cursor'Class;
Index_By : Field_Index'Base := No_Field_Index) return Direct_Cursor
is
Target : constant Abstract_Cursor_Access :=
Task_Safe_Instance (Source.Res, Index_By);
begin
if Target = Source.Res then
return Direct_Cursor (Source);
end if;
return (Ada.Finalization.Controlled with Res => Target);
end Task_Safe_Instance;
---------------------
-- Task_Safe_Clone --
---------------------
function Task_Safe_Clone (Source : Direct_Cursor) return Direct_Cursor is
Data : constant Data_Set_Pointers.Ref :=
Task_Cursor_Access (Source.Res).Data;
begin
if Data.Get.TID = Current_Task then
-- Do not need to create a copy for the task where the cursor created
return Source;
end if;
return (Ada.Finalization.Controlled with
Res => new Task_Cursor'
(Abstract_DBMS_Forward_Cursor with
Position => 1, Data => Data));
end Task_Safe_Clone;
end GNATCOLL.SQL.Exec.Tasking;
|