------------------------------------------------------------------------------ -- -- -- Matreshka Project -- -- -- -- SQL Database Access -- -- -- -- Runtime Library Component -- -- -- ------------------------------------------------------------------------------ -- -- -- Copyright © 2011-2020, Vadim Godunko -- -- All rights reserved. -- -- -- -- Redistribution and use in source and binary forms, with or without -- -- modification, are permitted provided that the following conditions -- -- are met: -- -- -- -- * Redistributions of source code must retain the above copyright -- -- notice, this list of conditions and the following disclaimer. -- -- -- -- * Redistributions in binary form must reproduce the above copyright -- -- notice, this list of conditions and the following disclaimer in the -- -- documentation and/or other materials provided with the distribution. -- -- -- -- * Neither the name of the Vadim Godunko, IE nor the names of its -- -- contributors may be used to endorse or promote products derived from -- -- this software without specific prior written permission. -- -- -- -- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -- -- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -- -- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -- -- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -- -- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -- -- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED -- -- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR -- -- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF -- -- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -- -- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -- -- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -- -- -- ------------------------------------------------------------------------------ -- $Revision: 5937 $ $Date: 2020-11-18 14:27:54 +0300 (Ср, 18 ноя 2020) $ ------------------------------------------------------------------------------ -- Implementation of database abstraction for PostgreSQL. ------------------------------------------------------------------------------ private with Ada.Containers.Ordered_Maps; package Matreshka.Internals.SQL_Drivers.PostgreSQL.Databases is type PostgreSQL_Database is new Abstract_Database with private; type Data_Types is (Text_Data, Integer_Data, Float_Data, Date_Data, Timestamp_Data); function Allocate_Statement_Name (Self : not null access PostgreSQL_Database'Class) return Interfaces.C.Strings.chars_ptr; -- Allocates statement identifier. Returns name as C pointer to be used -- in low level API. Returned name must be deallocated by caller. function Handle (Self : not null access PostgreSQL_Database'Class) return PGconn_Access; -- Returns database connection handle. function Get_Error_Message (Self : not null access PostgreSQL_Database'Class) return League.Strings.Universal_String; -- Returns current error message. function Get_Type (Self : not null access PostgreSQL_Database'Class; Type_Oid : Oid) return Data_Types; -- Returns base type of the type with specified Oid. function New_String (Item : League.Strings.Universal_String) return Interfaces.C.Strings.chars_ptr; -- Converts Universal_String into client encoding, allocates and returns C -- style string. Returned object must be dellocated by caller. private package Maps is new Ada.Containers.Ordered_Maps (Oid, Data_Types); type PostgreSQL_Database is new Abstract_Database with record Handle : PGconn_Access; Error : League.Strings.Universal_String; Statement : Natural; Type_Map : Maps.Map; end record; overriding procedure Close (Self : not null access PostgreSQL_Database); overriding procedure Commit (Self : not null access PostgreSQL_Database); overriding function Error_Message (Self : not null access PostgreSQL_Database) return League.Strings.Universal_String; overriding procedure Finalize (Self : not null access PostgreSQL_Database); overriding function Open (Self : not null access PostgreSQL_Database; Options : SQL.Options.SQL_Options) return Boolean; overriding function Query (Self : not null access PostgreSQL_Database) return not null Query_Access; end Matreshka.Internals.SQL_Drivers.PostgreSQL.Databases;