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506 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- Persistent.Native_ODBC Luebeck --
-- Interface Autumn, 2012 --
-- --
-- Last revision : 13:51 30 May 2014 --
-- --
-- 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. --
--____________________________________________________________________--
--
-- This package provides an implementation of persistent storage based
-- on an ODBC conform data base. The data base sturcture is defined as
-- follows:
--
-- The table of objects has the following columns:
--
-- object_id : a unique object identifier, primary key
-- catalogue_name : a unique object name, Unicode string
-- class_name : object class, Latin-1 string
-- object_data : object representation, Latin-1 string
-- parameter_list : object parameters, Latin-1 string
-- created_at : creation time
--
-- The table of links represent depends on relation:
--
-- dependant : dependent object identifier
-- referent : reference object identifier
--
-- Each record represents dependency of the object identified by id
-- from the object identified by reference. Objects that are excluded
-- from garbage collection contain records referencing the objects
-- themselves.
--
with Ada.Task_Identification; use Ada.Task_Identification;
with Ada.Strings.Unbounded; use Ada.Strings.Unbounded;
with ODBC; use ODBC;
with ODBC.API; use ODBC.API;
with ODBC.API.Keys; use ODBC.API.Keys;
with ODBC.API.Keys.Arrays; use ODBC.API.Keys.Arrays;
with ODBC.API.Keys.Sets; use ODBC.API.Keys.Sets;
with ODBC.SQLTypes; use ODBC.SQLTypes;
with Object.Archived.Sets; use Object.Archived.Sets;
with Persistent.Data_Bank; use Persistent.Data_Bank;
with Persistent.Handle; use Persistent.Handle;
with Ada.Finalization;
with Generic_Unbounded_Ptr_Array;
with Persistent.Data_Bank.Indexed;
package Persistent.Native_ODBC is
type ODBC_Connection_Ptr is access all ODBC_Connection'Class;
type ODBC_Command_Ptr is access all ODBC_Command'Class;
--
-- Create -- An ODBC persistent storage interface object
--
-- Server_Name - To connect to (UTF-8 encoded)
-- User_Name - To connect as (UTF-8 encoded)
-- Password - Of the user (UTF-8 encoded)
-- Erase - Erase the data base upon connecting
--
-- This function creates an ODBC persistent storage interface object and
-- returns a handle to it. The object is responsible for interacting
-- with an ODBC conform data base. A connection is established to the
-- server specified by the parameter Server_Name. The parameters
-- User_Name and Password identify the data base user. Refer to the ODBC
-- driver configuration for further information about these parameters.
-- The parameter Erase when True erases the data base contents by
-- dropping all the tables used for storing persistent objects. If the
-- data base contains any additional tables, they remain untouched.
--
-- Returns :
--
-- Handle to the created ODBC storage object
--
-- Exceptions :
--
-- Use_Error - Password or other data might be wrong
-- Data_Error - Data base error
--
function Create
( Server_Name : String;
User_Name : String;
Password : String;
Erase : Boolean := False
) return Storage_Handle;
--
-- Disable_Tracing -- Stop tracing
--
-- Storage - A handle to persistent storage
--
-- Exceptions :
--
-- Constraint_Error - Not a valid handle to an ODBC storage
--
procedure Disable_Tracing
( Storage : in out Storage_Handle
);
--
-- Enable_Tracing -- Set a trace file
--
-- Storage - A handle to persistent storage
-- Name - Of the trace file
--
-- Exceptions :
--
-- Constraint_Error - Not a valid handle to an ODBC storage
-- Data_Error - Any other error
--
procedure Enable_Tracing
( Storage : in out Storage_Handle;
Name : String
);
--
-- Get_Connection -- Get a handle to the ODBC connection
--
-- Storage - A handle to persistent storage
--
-- Returns :
--
-- Pointer to the connection object
--
-- Exceptions :
--
-- Constraint_Error - Not a valid handle to an ODBC storage
--
function Get_Connection (Storage : Storage_Handle)
return ODBC_Connection_Ptr;
--
-- Get_Server_Name -- Get server name
--
-- Storage - A handle to persistent storage
--
-- Returns :
--
-- The server name
--
-- Exceptions :
--
-- Constraint_Error - Not a valid handle to an ODBC storage
--
function Get_Server_Name (Storage : Storage_Handle) return String;
--
-- Is_ODBC -- Test if the storage handle refers ODBC storage
--
-- Storage - A handle to persistent storage
--
-- Returns :
--
-- True if Storage refers an ODBC one
--
function Is_ODBC (Storage : Storage_Handle) return Boolean;
--
-- Serializable -- Check if concurrent access is safe
--
-- Storage - A handle to persistent storage
--
-- When the result is false it is unsafe to have more than one
-- connection to the data base.
--
-- Returns :
--
-- True if the driver supports interlocking
--
-- Exceptions :
--
-- Constraint_Error - Not a valid handle to an ODBC storage
--
function Serializable (Storage : Storage_Handle)
return Boolean;
--
-- The ODBC environment for all connections
--
Environment : aliased ODBC_Environment;
private
pragma Inline (Is_ODBC);
--
-- Table names:
--
Direct_Links_Table : aliased String := "direct_links";
Backward_Links_Table : aliased String := "backward_links";
Objects_Table : aliased String := "objects";
--
-- Columns:
--
ID_Column : constant String := "object_id";
Name_Column : constant String := "catalogue_name";
Class_Column : constant String := "class_name";
Data_Column : constant String := "object_data";
Parameters_Column : constant String := "parameters_list";
Time_Column : constant String := "created_at";
Parent_ID_Column : constant String := "parent_id";
--
-- Prefixes of training set's table names:
--
Has_In_Table : constant String := "has_in_";
Has_Out_Table : constant String := "has_out_";
Has_Not_Table : constant String := "has_not_";
Has_Not_Out_Table : constant String := "has_not_out_";
--
-- Arrays of string pointers
--
type String_Ptr is access String;
type String_Ptr_Array is array (Integer range <>) of String_Ptr;
package String_List is
new Generic_Unbounded_Ptr_Array
( Index_Type => Integer,
Object_Type => String,
Object_Ptr_Type => String_Ptr,
Object_Ptr_Array_Type => String_Ptr_Array
);
use String_List;
--
-- Object_Key_Array -- Unbounded array of Object_Key
--
type Object_Key_Array is new Persistent_Key_Array with record
List : Unbounded_Array;
end record;
--
-- Get -- Overrides Persistent.Data_Bank...
--
function Get (Container : Object_Key_Array; Index : Integer)
return Persistent_Key'Class;
--
-- Put -- Overrides Persistent.Data_Bank...
--
procedure Put
( Container : in out Object_Key_Array;
Index : Integer;
Key : Persistent_Key'Class
);
package Indexed is
new Persistent.Data_Bank.Indexed
( Data_Bank_Object,
Object_Key,
Object_Key_Array
);
use Indexed;
--
-- SQL_Type_Info -- Description of the SQL type available for use
--
type SQL_Type_Info is record
Data_Type : SQL_Data_Type;
Name : Unbounded_String;
end record;
--
-- Data_Base_Object -- ODBC data base as persistent storage
--
type Data_Base_Object (Server_Name_Length : Natural) is
new Indexed_Storage_Object with
record
Connection : ODBC_Connection_Ptr;
Command : ODBC_Command_Ptr;
Sharing : Sharing_Type := Fully;
Owner : Task_ID := Null_Task_ID;
Count : Natural := 0;
Serializable : Boolean := True;
Has_Bigint : Boolean := False;
Cached_Key : Object_ID := No_ID;
Next_ID : Object_ID;
Cached_Last : Integer := 0;
Cached_Set : Sets.Set;
--
-- Driver specifics :
--
Integer_SQL_Type : SQL_Type_Info; -- Integer type
ID_SQL_Type : SQL_Type_Info; -- Objects IDs
Name_SQL_Type : SQL_Type_Info; -- Objects names
Data_SQL_Type : SQL_Type_Info; -- Variable strings
Stamp_SQL_Type : SQL_Type_Info; -- Time stamps
--
-- Server name :
--
Server_Name : String (1..Server_Name_Length);
end record;
type Data_Base_Ptr is access Data_Base_Object'Class;
--
-- Commit -- Overrides Persistent.Data_Bank...
--
procedure Commit (Storage : in out Data_Base_Object);
--
-- Connect -- Make ODBC persistent storage interface object ready
--
-- Storage - To prepare to work
-- Server_Name - To connect to (UTF-8 encoded)
-- User_Name - To connect as (UTF-8 encoded)
-- Password - Of the user (UTF-8 encoded)
-- Erase - Erase the data base upon connecting
--
-- This procedure is called from Create to make Storage ready to use. If
-- any type is derived from Data_Base_Object, it should call Connect at
-- some point after Initialize, but before any use.
--
-- Exceptions :
--
-- Use_Error - Password or other data might be wrong
-- Data_Error - Data base error
--
procedure Connect
( Storage : in out Data_Base_Object'Class;
Server_Name : String;
User_Name : String;
Password : String;
Erase : Boolean := False
);
--
-- Delete -- Overrides Persistent.Data_Bank...
--
procedure Delete
( Storage : in out Data_Base_Object;
Key : Persistent_Key'Class
);
--
-- Finalize -- Destruction
--
-- Storage - To finalize
--
procedure Finalize (Storage : in out Data_Base_Object);
--
-- Find -- Overrides Persistent.Data_Bank...
--
function Find
( Storage : access Data_Base_Object;
Name : String;
Parent : Persistent_Key'Class
) return Persistent_Key'Class;
--
-- Get_Access_Mode -- Overrides Persistent.Data_Bank...
--
function Get_Access_Mode (Storage : Data_Base_Object)
return Sharing_Type;
--
-- Get_Children -- Overrides Persistent.Data_Bank...
--
procedure Get_Children
( Storage : in out Data_Base_Object;
Key : Persistent_Key'Class;
Children : in out Persistent_Key_Array'Class;
Pointer : in out Integer
);
--
-- Get_Class -- Overrides Persistent.Data_Bank...
--
function Get_Class
( Storage : access Data_Base_Object;
Key : Persistent_Key'Class
) return String;
--
-- Get_Creation_Time -- Overrides Persistent.Data_Bank...
--
function Get_Creation_Time
( Storage : access Data_Base_Object;
Key : Persistent_Key'Class
) return Time;
--
-- Get_Data -- Overrides Persistent.Data_Bank...
--
procedure Get_Data
( Storage : in out Data_Base_Object;
Key : Persistent_Key'Class;
Class : out Unbounded_String;
Data : out Unbounded_String;
Parameters : out Unbounded_String
);
--
-- Get_Dependant -- Overrides Persistent.Data_Bank...
--
function Get_Dependant
( Storage : access Data_Base_Object;
Key : Persistent_Key'Class;
No : Positive
) return Persistent_Key'Class;
--
-- Get_List -- Overrides Persistent...
--
-- Effects :
--
-- Seize_Read
--
function Get_List
( Storage : access Data_Base_Object;
Prefix : String := "";
Suffix : String := "";
Equivalence : Unicode_Mapping_Function := null;
Parent : Deposit_Handle := Root_Directory
) return Catalogue.Set;
--
-- Get_Name -- Overrides Persistent.Data_Bank...
--
function Get_Name
( Storage : access Data_Base_Object;
Key : Persistent_Key'Class;
Parent : access Persistent_Key'Class
) return String;
--
-- Get_References -- Overrides Persistent.Data_Bank...
--
procedure Get_References
( Storage : in out Data_Base_Object;
Key : Persistent_Key'Class;
References : in out Persistent_Key_Array'Class;
Pointer : in out Integer
);
--
-- Has_Dependants -- Overrides Persistent.Data_Bank...
--
function Has_Dependants
( Storage : access Data_Base_Object;
Key : Persistent_Key'Class;
All_Links : Boolean
) return Boolean;
--
-- Is_In -- Overrides Persistent.Data_Bank...
--
function Is_In
( Storage : access Data_Base_Object;
Key : Persistent_Key'Class
) return Boolean;
--
-- Rename -- Overrides Persistent.Data_Bank...
--
procedure Rename
( Storage : in out Data_Base_Object;
Key : Persistent_Key'Class;
Name : String;
Parent : Persistent_Key'Class
);
--
-- RollBack -- Overrides Persistent.Data_Bank...
--
procedure Roll_Back (Storage : in out Data_Base_Object);
--
-- Seize_Read -- Overrides Persistent.Data_Bank...
--
procedure Seize_Read (Storage : in out Data_Base_Object);
--
-- Seize_Write -- Overrides Persistent.Data_Bank...
--
procedure Seize_Write (Storage : in out Data_Base_Object);
--
-- Store -- Overrides Persistent.Data_Bank...
--
function Store
( Storage : access Data_Base_Object;
Name : String;
Parent : Persistent_Key'Class;
Class : String;
Data : String;
Parameters : String;
Direct_Links : Deposit_Set;
Backward_Links : Deposit_Set
) return Persistent_Key'Class;
function Store
( Storage : access Data_Base_Object;
Class : String;
Data : String;
Parameters : String;
Direct_Links : Deposit_Set;
Backward_Links : Deposit_Set
) return Persistent_Key'Class;
--
-- Unname -- Overrides Persistent.Data_Bank...
--
procedure Unname
( Storage : in out Data_Base_Object;
Key : Persistent_Key'Class
);
--
-- Update -- Overrides Persistent.Data_Bank...
--
procedure Update
( Storage : in out Data_Base_Object;
Key : Persistent_Key'Class;
Class : String;
Data : String;
Parameters : String;
Direct_Links : Deposit_Set;
Backward_Links : Deposit_Set
);
--
-- Value -- Overrides Persistent.Data_Bank...
--
function Value
( Storage : Data_Base_Object;
Key : String
) return Persistent_Key'Class;
end Persistent.Native_ODBC;
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