/usr/share/ada/adainclude/apq-postgresql/apq-postgresql-client.adb is in libapq-postgresql3.2.0-dev 3.2.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- --
-- APQ DATABASE BINDINGS --
-- --
-- A P Q - POSTGRESQL --
-- --
-- B o d y --
-- --
-- Copyright (C) 2002-2007, Warren W. Gay VE3WWG --
-- Copyright (C) 2007-2009, Ada Works Project --
-- --
-- --
-- APQ is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 2, or (at your option) any later ver- --
-- sion. APQ is distributed in the hope that it will be useful, but WITH- --
-- OUT 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 distributed with APQ; see file COPYING. If not, write --
-- to the Free Software Foundation, 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. --
------------------------------------------------------------------------------
with Ada.Exceptions;
with Ada.Calendar;
with Ada.Unchecked_Deallocation;
with Ada.Unchecked_Conversion;
with Ada.Characters.Latin_1;
with Ada.Characters.Handling;
with Ada.Strings.Fixed;
with Ada.IO_Exceptions;
with System;
with System.Address_To_Access_Conversions;
with Interfaces.C.Strings;
with GNAT.OS_Lib;
use Interfaces.C;
use Ada.Exceptions;
package body APQ.PostgreSQL.Client is
Seek_Set : constant Interfaces.C.int := 0;
Seek_Cur : constant Interfaces.C.int := 1;
Seek_End : constant Interfaces.C.int := 2;
No_Date : Ada.Calendar.Time;
type PQ_Status_Type is (
Connection_OK,
Connection_Bad,
Connection_Started, -- Waiting for connection to be made.
Connection_Made, -- Connection OK; waiting to send.
Connection_Awaiting_Response, -- Waiting for a response
Connection_Auth_OK, -- Received authentication
Connection_Setenv -- Negotiating environment.
);
for PQ_Status_Type use (
0, -- CONNECTION_OK
1, -- CONNECTION_BAD
2, -- CONNECTION_STARTED
3, -- CONNECTION_MADE
4, -- CONNECTION_AWAITING_RESPONSE
5, -- CONNECTION_AUTH_OK
6 -- CONNECTION_SETENV
);
------------------------------
-- DATABASE CONNECTION :
------------------------------
function Engine_Of(C : Connection_Type) return Database_Type is
begin
return Engine_PostgreSQL;
end Engine_Of;
function New_Query(C : Connection_Type) return Root_Query_Type'Class is
Q : Query_Type;
begin
return Q;
end New_Query;
procedure Notify_on_Standard_Error(C : in out Connection_Type; Message : String) is
use Ada.Text_IO;
begin
Put(Standard_Error,"*** NOTICE : ");
Put_Line(Standard_Error,Message);
end Notify_on_Standard_Error;
procedure Set_Instance(C : in out Connection_Type; Instance : String) is
begin
Raise_Exception(Not_Supported'Identity,
"PG01: PostgreSQL has no Instance ID. (Set_Instance)");
end Set_Instance;
function Host_Name(C : Connection_Type) return String is
begin
if not Is_Connected(C) then
return Host_Name(Root_Connection_Type(C));
else
declare
use Interfaces.C.Strings;
function PQhost(PGconn : PG_Conn) return chars_ptr;
pragma Import(C,PQhost,"PQhost");
The_Host : chars_ptr := PQhost(C.Connection);
begin
if The_Host = Null_Ptr then
return "localhost";
end if;
return Value_Of(The_Host);
end;
end if;
end Host_Name;
function Port(C : Connection_Type) return Integer is
begin
if not Is_Connected(C) then
return Port(Root_Connection_Type(C));
else
declare
use Interfaces.C.Strings;
function PQport(PGconn : PG_Conn) return chars_ptr;
pragma Import(C,PQport,"PQport");
The_Port : String := Value_Of(PQport(C.Connection));
begin
return Integer'Value(The_Port);
exception
when others =>
Raise_Exception(Invalid_Format'Identity,
"PG02: Invalid port number or is a UNIX socket reference (Port).");
end;
end if;
return 0;
end Port;
function Port(C : Connection_Type) return String is
begin
if not Is_Connected(C) then
return Port(Root_Connection_Type(C));
else
declare
use Interfaces.C.Strings;
function PQport(PGconn : PG_Conn) return chars_ptr;
pragma Import(C,PQport,"PQport");
begin
return Value_Of(PQport(C.Connection));
end;
end if;
end Port;
function DB_Name(C : Connection_Type) return String is
begin
if not Is_Connected(C) then
return To_Case(DB_Name(Root_Connection_Type(C)),C.SQL_Case);
else
declare
use Interfaces.C.Strings;
function PQdb(PGconn : PG_Conn) return chars_ptr;
pragma Import(C,PQdb,"PQdb");
begin
return Value_Of(PQdb(C.Connection));
end;
end if;
end DB_Name;
function User(C : Connection_Type) return String is
begin
if not Is_Connected(C) then
return User(Root_Connection_Type(C));
else
declare
use Interfaces.C.Strings;
function PQuser(PGconn : PG_Conn) return chars_ptr;
pragma Import(C,PQuser,"PQuser");
begin
return Value_Of(PQuser(C.Connection));
end;
end if;
end User;
function Password(C : Connection_Type) return String is
begin
if not Is_Connected(C) then
return Password(Root_Connection_Type(C));
else
declare
use Interfaces.C.Strings;
function PQpass(PGconn : PG_Conn) return chars_ptr;
pragma Import(C,PQpass,"PQpass");
begin
return Value_Of(PQpass(C.Connection));
end;
end if;
end Password;
procedure Set_DB_Name(C : in out Connection_Type; DB_Name : String) is
procedure Use_Database(C : in out Connection_Type; DB_Name : String) is
Q : Query_Type;
begin
begin
Prepare(Q,To_Case("USE " & DB_Name,C.SQL_Case));
Execute(Q,C);
exception
when SQL_Error =>
Raise_Exception(APQ.Use_Error'Identity,
"PG03: Unable to select database " & DB_Name & ". (Use_Database)");
end;
end Use_Database;
begin
if not Is_Connected(C) then
-- Modify context to connect to this database when we connect
Set_DB_Name(Root_Connection_Type(C),DB_Name);
else
-- Use this database now
Use_Database(C,DB_Name);
-- Update context info if no exception thrown above
Set_DB_Name(Root_Connection_Type(C),DB_Name);
end if;
end Set_DB_Name;
procedure Set_Options(C : in out Connection_Type; Options : String) is
begin
Replace_String(C.Options,Set_Options.Options);
end Set_Options;
function Options(C : Connection_Type) return String is
begin
if not Is_Connected(C) then
if C.Options /= null then
return C.Options.all;
end if;
else
declare
use Interfaces.C.Strings;
function PQoptions(PGconn : PG_Conn) return chars_ptr;
pragma Import(C,PQoptions,"PQoptions");
begin
return Value_Of(PQoptions(C.Connection));
end;
end if;
return "";
end Options;
procedure Set_Notify_Proc(C : in out Connection_Type; Notify_Proc : Notify_Proc_Type) is
begin
C.Notify_Proc := Set_Notify_Proc.Notify_Proc;
end Set_Notify_Proc;
function Notify_Proc(C : Connection_Type) return Notify_Proc_Type is
begin
return C.Notify_Proc;
end Notify_Proc;
--------------------------------------------------
-- Connection_Notify is called by notices.c as
-- a callback from the libpq interface.
--------------------------------------------------
procedure Connection_Notify(C_Addr : System.Address; Msg_Ptr : Interfaces.C.Strings.chars_ptr);
pragma Export(C,Connection_Notify,"Connection_Notify");
procedure Connection_Notify(C_Addr : System.Address; Msg_Ptr : Interfaces.C.Strings.chars_ptr) is
use Interfaces.C.Strings;
package Addr is new System.Address_To_Access_Conversions(Connection_Type);
function Strip_Prefix(S : String) return String is
use Ada.Strings.Fixed, Ada.Strings;
begin
if S(S'First..S'First+6) = "NOTICE:" then
return Trim(S(S'First+7..S'Last),Left);
end if;
return S;
end Strip_Prefix;
Abrt_Notice : constant String := "current transaction is aborted, queries ignored until end of transaction block";
Conn : Addr.Object_Pointer := Addr.To_Pointer(C_Addr);
Msg : String := Strip_Prefix(Strip_NL(To_Ada_String(Msg_Ptr)));
begin
if Conn.Notice /= null then
Free(Conn.Notice); -- Free last notice
end if;
-- Store new notice
Conn.Notice := new String(1..Msg'Length);
Conn.Notice.all := Msg;
if Conn.Notice.all = Abrt_Notice then
Conn.Abort_State := True;
end if;
if Conn.Notify_Proc /= Null then
Conn.Notify_Proc(Conn.all,Conn.Notice.all);
end if;
end Connection_Notify;
function PQ_Status(C : Connection_Type) return PQ_Status_Type is
function PQstatus(C : PG_Conn) return PQ_Status_Type;
pragma Import(C,PQstatus,"PQstatus");
begin
if C.Connection = Null_Connection then
return Connection_Bad;
else
return PQstatus(C.Connection);
end if;
end PQ_Status;
procedure Connect(C : in out Connection_Type; Check_Connection : Boolean := True) is
procedure Notice_Install(Conn : PG_Conn; ada_obj_ptr : System.Address);
pragma import(C,Notice_Install,"notice_install");
function PQsetdbLogin(pghost, pgport, pgoptions, pgtty, dbname, login, pwd : System.Address) return PG_Conn;
pragma import(C,PQsetdbLogin,"PQsetdbLogin");
use Interfaces.C.Strings;
C_Host : char_array_access;
A_Host : System.Address := System.Null_Address;
C_Options : char_array_access;
A_Options : System.Address := System.Null_Address;
C_Tty : char_array_access;
A_Tty : System.Address := System.Null_Address;
C_Dbname : char_array_access;
A_Dbname : System.Address := System.Null_Address;
C_Login : char_array_access;
A_Login : System.Address := System.Null_Address;
C_Pwd : char_array_access;
A_Pwd : System.Address := System.Null_Address;
begin
if Check_Connection and then Is_Connected(C) then
Raise_Exception(Already_Connected'Identity,
"PG07: Already connected (Connect).");
end if;
C_String(C.Host_Name,C_Host,A_Host);
C_String(C.Options,C_Options,A_Options);
C_String(null,C_Tty,A_Tty);
C_String(C.DB_Name,C_Dbname,A_Dbname);
C_String(C.User_Name,C_Login,A_Login);
C_String(C.User_Password,C_Pwd,A_Pwd);
if C.Port_Format = IP_Port then
declare
C_Port : char_array := To_C(Port_Integer'Image(C.Port_Number));
A_Port : System.Address := C_Port'Address;
begin
-- Use application specified port #
C.Connection := PQsetdbLogin(A_Host,A_Port,A_Options,A_Tty,A_Dbname,A_Login,A_Pwd);
end;
elsif C.Port_Format = UNIX_Port then
declare
C_Port : char_array_access;
A_Port : System.Address := System.Null_Address;
begin
C_String(C.Port_Name,C_Port,A_Port);
C.Connection := PQsetdbLogin(A_Host,A_Port,A_Options,A_Tty,A_Dbname,A_Login,A_Pwd);
end;
else
raise Program_Error;
end if;
if C_Host /= null then
Free(C_Host);
end if;
if C_Options /= null then
Free(C_Options);
end if;
if C_Tty /= null then
Free(C_Tty);
end if;
if C_Dbname /= null then
Free(C_Dbname);
end if;
if C_Login /= null then
Free(C_Login);
end if;
if C_Pwd /= null then
Free(C_Pwd);
end if;
Free_Ptr(C.Error_Message);
if PQ_Status(C) /= Connection_OK then
declare
procedure PQfinish(C : PG_Conn);
pragma Import(C,PQfinish,"PQfinish");
Msg : String := Strip_NL(Error_Message(C));
begin
PQfinish(C.Connection);
C.Connection := Null_Connection;
C.Error_Message := new String(1..Msg'Length);
C.Error_Message.all := Msg;
Raise_Exception(Not_Connected'Identity,
"PG08: Failed to connect to database server (Connect).");
end;
end if;
Notice_Install(C.Connection,C'Address); -- Install Connection_Notify handler
------------------------------
-- SET PGDATESTYLE TO ISO;
--
-- This is necessary for all of the
-- APQ date handling routines to
-- function correctly. This implies
-- that all APQ applications programs
-- should use the ISO date format.
------------------------------
declare
SQL : Query_Type;
begin
Prepare(SQL,"SET DATESTYLE TO ISO");
Execute(SQL,C);
exception
when Ex : others =>
Disconnect(C);
Reraise_Occurrence(Ex);
end;
end Connect;
procedure Connect(C : in out Connection_Type; Same_As : Root_Connection_Type'Class) is
type Info_Func is access function(C : Connection_Type) return String;
procedure Clone(S : in out String_Ptr; Get_Info : Info_Func) is
Info : String := Get_Info(Connection_Type(Same_As));
begin
if Info'Length > 0 then
S := new String(1..Info'Length);
S.all := Info;
else
null;
pragma assert(S = null);
end if;
end Clone;
begin
Reset(C);
Clone(C.Host_Name,Host_Name'Access);
C.Port_Format := Same_As.Port_Format;
if C.Port_Format = IP_Port then
C.Port_Number := Port(Same_As); -- IP_Port
else
Clone(C.Port_Name,Port'Access); -- UNIX_Port
end if;
Clone(C.DB_Name,DB_Name'Access);
Clone(C.User_Name,User'Access);
Clone(C.User_Password,Password'Access);
Clone(C.Options,Options'Access);
C.Rollback_Finalize := Same_As.Rollback_Finalize;
C.Notify_Proc := Connection_Type(Same_As).Notify_Proc;
Connect(C); -- Connect to database before worrying about trace facilities
-- TRACE FILE & TRACE SETTINGS ARE NOT CLONED
end Connect;
procedure Disconnect(C : in out Connection_Type) is
procedure Notice_Uninstall(C : PG_Conn);
pragma Import(C,notice_uninstall,"notice_uninstall");
procedure PQfinish(C : PG_Conn);
pragma Import(C,PQfinish,"PQfinish");
begin
if not Is_Connected(C) then
Raise_Exception(Not_Connected'Identity,
"PG09: Not connected. (Disconnect)");
end if;
Notice_Uninstall(C.Connection); -- Disconnect callback notices
PQfinish(C.Connection); -- Now release the connection
C.Connection := Null_Connection;
C.Abort_State := False; -- Clear abort state
C.Notify_Proc := null; -- De-register the notify procedure
if C.Trace_Mode = Trace_APQ or else C.Trace_Mode = Trace_Full then
Ada.Text_IO.Put_Line(C.Trace_Ada,"-- DISCONNECT");
end if;
Reset(C);
end Disconnect;
function Is_Connected(C : Connection_Type) return Boolean is
begin
return PQ_Status(C) = Connection_OK;
end Is_Connected;
procedure Internal_Reset(C : in out Connection_Type; In_Finalize : Boolean := False) is
begin
Free_Ptr(C.Error_Message);
if C.Connection /= Null_Connection then
declare
Q : Query_Type;
begin
Clear_Abort_State(C);
if C.Rollback_Finalize or In_Abort_State(C) then
if C.Trace_On and then C.Trace_Filename /= null and then In_Finalize = True then
Ada.Text_IO.Put_Line(C.Trace_Ada,"-- ROLLBACK ON FINALIZE");
end if;
Rollback_Work(Q,C);
else
if C.Trace_On and then C.Trace_Filename /= null and then In_Finalize = True then
Ada.Text_IO.Put_Line(C.Trace_Ada,"-- COMMIT ON FINALIZE");
end if;
Commit_Work(Q,C);
end if;
exception
when others =>
null; -- Ignore if the Rollback/commit fails
end;
Clear_Abort_State(C);
Disconnect(C);
if C.Trace_Filename /= null then
Close_DB_Trace(C);
end if;
end if;
if C.Connection = Null_Connection then
Free_Ptr(C.Host_Name);
Free_Ptr(C.Host_Address);
Free_Ptr(C.DB_Name);
Free_Ptr(C.User_Name);
Free_Ptr(C.User_Password);
Free_Ptr(C.Options);
Free_Ptr(C.Error_Message);
Free_Ptr(C.Notice);
end if;
end Internal_Reset;
procedure Reset(C : in out Connection_Type) is
begin
Internal_Reset(C,In_Finalize => False);
end Reset;
function Error_Message(C : Connection_Type) return String is
function PQerrorMessage(C : PG_Conn) return Interfaces.C.Strings.chars_ptr;
pragma Import(C,PQerrorMessage,"PQerrorMessage");
begin
if C.Connection = Null_Connection then
if C.Error_Message /= null then
return C.Error_Message.all;
else
return "";
end if;
else
return To_Ada_String(PQerrorMessage(C.Connection));
end if;
end Error_Message;
function Notice_Message(C : Connection_Type) return String is
begin
if C.Notice /= null then
return C.Notice.all;
end if;
return "";
end Notice_Message;
procedure Open_DB_Trace(C : in out Connection_Type; Filename : String; Mode : Trace_Mode_Type := Trace_APQ) is
begin
if C.Trace_Filename /= null then
Raise_Exception(Tracing_State'Identity,
"PG04: Already in a tracing state (Open_DB_Trace).");
end if;
if not Is_Connected(C) then
Raise_Exception(Not_Connected'Identity,
"PG05: Not connected (Open_DB_Trace).");
end if;
if Mode = Trace_None then
pragma assert(C.Trace_Mode = Trace_None);
return; -- No trace required
end if;
declare
use CStr, System, Ada.Text_IO, Ada.Text_IO.C_Streams;
procedure PQtrace(PGconn : PG_Conn; debug_port : CStr.FILEs);
pragma Import(C,PQtrace,"PQtrace");
C_Filename : char_array := To_C(Filename);
File_Mode : char_array := To_C("a");
begin
C.Trace_File := fopen(C_Filename'Address,File_Mode'Address);
if C.Trace_File = Null_Stream then
Raise_Exception(Ada.IO_Exceptions.Name_Error'Identity,
"PG06: Unable to open trace file " & Filename & " (Open_DB_Trace).");
end if;
Open(C.Trace_Ada,Append_File,C.Trace_File,Form => "shared=yes");
Ada.Text_IO.Put_Line(C.Trace_Ada,"-- Start of Trace, Mode = " & Trace_Mode_Type'Image(Mode));
if Mode = Trace_DB or Mode = Trace_Full then
PQtrace(C.Connection,C.Trace_File);
end if;
end;
C.Trace_Filename := new String(1..Filename'Length);
C.Trace_Filename.all := Filename;
C.Trace_Mode := Mode;
C.Trace_On := True; -- Enabled by default until Set_Trace disables this
end Open_DB_Trace;
procedure Close_DB_Trace(C : in out Connection_Type) is
begin
if C.Trace_Mode = Trace_None then
return; -- No tracing in progress
end if;
pragma assert(C.Trace_Filename /= null);
declare
use CStr;
procedure PQuntrace(PGconn : PG_Conn);
pragma Import(C,PQuntrace,"PQuntrace");
begin
if C.Trace_Mode = Trace_DB or C.Trace_Mode = Trace_Full then
PQuntrace(C.Connection);
end if;
Free(C.Trace_Filename);
Ada.Text_IO.Put_Line(C.Trace_Ada,"-- End of Trace.");
Ada.Text_IO.Close(C.Trace_Ada); -- This closes C.Trace_File too
C.Trace_Mode := Trace_None;
C.Trace_On := True; -- Restore default
end;
end Close_DB_Trace;
procedure Set_Trace(C : in out Connection_Type; Trace_On : Boolean := True) is
procedure PQtrace(PGconn : PG_Conn; debug_port : CStr.FILEs);
procedure PQuntrace(PGconn : PG_Conn);
pragma Import(C,PQtrace,"PQtrace");
pragma Import(C,PQuntrace,"PQuntrace");
Orig_Trace : Boolean := C.Trace_On;
begin
C.Trace_On := Set_Trace.Trace_On;
if Orig_Trace = C.Trace_On then
return; -- No change
end if;
if C.Trace_On then
if C.Trace_Mode = Trace_DB or C.Trace_Mode = Trace_Full then
PQtrace(C.Connection,C.Trace_File); -- Enable libpq tracing
end if;
else
if C.Trace_Mode = Trace_DB or C.Trace_Mode = Trace_Full then
PQuntrace(C.Connection); -- Disable libpq tracing
end if;
end if;
end Set_Trace;
function Is_Trace(C : Connection_Type) return Boolean is
begin
return C.Trace_On;
end Is_Trace;
function In_Abort_State(C : Connection_Type) return Boolean is
begin
if C.Connection = Null_Connection then
return False;
end if;
return C.Abort_State;
end In_Abort_State;
------------------------------
-- SQL QUERY API :
------------------------------
procedure Free(R : in out PQ_Result) is
procedure PQclear(R : PQ_Result);
pragma Import(C,PQclear,"PQclear");
begin
if R /= Null_Result then
PQclear(R);
R := Null_Result;
end if;
end Free;
procedure Clear(Q : in out Query_Type) is
begin
Free(Q.Result);
Clear(Root_Query_Type(Q));
end Clear;
procedure Append_Quoted(Q : in out Query_Type; Connection : Root_Connection_Type'Class; SQL : String; After : String := "") is
function PQescapeString(to, from : System.Address; length : size_t) return size_t;
pragma Import(C,PQescapeString,"PQescapeString");
C_Length : size_t := SQL'Length * 2 + 1;
C_From : char_array := To_C(SQL);
C_To : char_array(0..C_Length-1);
R_Length : size_t := PQescapeString(C_To'Address,C_From'Address,C_Length);
begin
Append(Q,"'" & To_Ada(C_To) & "'",After);
Q.Caseless(Q.Count) := False; -- Preserve case for this one
end Append_Quoted;
procedure Execute(Query : in out Query_Type; Connection : in out Root_Connection_Type'Class) is
function PQexec(C : PG_Conn; Q : System.Address) return PQ_Result;
pragma Import(C,PQexec,"PQexec");
R : Result_Type;
begin
Query.SQL_Case := Connection.SQL_Case;
if not Is_Connected(Connection) then
Raise_Exception(Not_Connected'Identity,
"PG14: The Connection_Type object supplied is not connected (Execute).");
end if;
if In_Abort_State(Connection) then
Raise_Exception(Abort_State'Identity,
"PG15: The PostgreSQL connection is in the Abort state (Execute).");
end if;
if Query.Result /= Null_Result then
Free(Query.Result);
end if;
declare
A_Query : String := To_String(Query);
C_Query : char_array := To_C(A_Query);
begin
if Connection.Trace_On then
if Connection.Trace_Mode = Trace_APQ or Connection.Trace_Mode = Trace_Full then
Ada.Text_IO.Put_Line(Connection.Trace_Ada,"-- SQL QUERY:");
Ada.Text_IO.Put_Line(Connection.Trace_Ada,A_Query);
Ada.Text_IO.Put_Line(Connection.Trace_Ada,";");
end if;
end if;
Query.Result := PQexec(Internal_Connection(Connection_Type(Connection)),C_Query'Address);
if Connection.Trace_On then
if Connection.Trace_Mode = Trace_APQ or Connection.Trace_Mode = Trace_Full then
Ada.Text_IO.Put_Line(Connection.Trace_Ada,"-- Result: '" & Command_Status(Query) & "'");
Ada.Text_IO.New_Line(Connection.Trace_Ada);
end if;
end if;
end;
if Query.Result /= Null_Result then
Query.Tuple_Index := First_Tuple_Index;
R := Result(Query);
if R /= Command_OK and R /= Tuples_OK then
-- if Connection.Trace_On then
-- Ada.Text_IO.Put_Line(Connection.Trace_Ada,"-- Error " &
-- Result_Type'Image(Query.Error_Code) & " : " & Error_Message(Query));
-- end if;
Raise_Exception(SQL_Error'Identity,
"PG16: The query failed (Execute).");
end if;
else
-- if Connection.Trace_On then
-- Ada.Text_IO.Put_Line(Connection.Trace_Ada,"-- Error " &
-- Result_Type'Image(Query.Error_Code) & " : " & Error_Message(Query));
-- end if;
Raise_Exception(SQL_Error'Identity,
"PG17: The query failed (Execute).");
end if;
end Execute;
procedure Execute_Checked(Query : in out Query_Type; Connection : in out Root_Connection_Type'Class; Msg : String := "") is
use Ada.Text_IO;
begin
begin
Execute(Query,Connection);
exception
when Ex : SQL_Error =>
if Msg'Length > 0 then
Put(Standard_Error,"*** SQL ERROR: ");
Put_Line(Standard_Error,Msg);
else
Put(Standard_Error,"*** SQL ERROR IN QUERY:");
New_Line(Standard_Error);
Put(Standard_Error,To_String(Query));
if Col(Standard_Error) > 1 then
New_Line(Standard_Error);
end if;
end if;
Put(Standard_Error,"[");
Put(Standard_Error,Result_Type'Image(Result(Query)));
Put(Standard_Error,": ");
Put(Standard_Error,Error_Message(Query));
Put_Line(Standard_Error,"]");
Reraise_Occurrence(Ex);
when Ex : others =>
Reraise_Occurrence(Ex);
end;
end Execute_Checked;
procedure Begin_Work(Query : in out Query_Type; Connection : in out Root_Connection_Type'Class) is
begin
if In_Abort_State(Connection) then
Raise_Exception(Abort_State'Identity,
"PG36: PostgreSQL connection is in the abort state (Begin_Work).");
end if;
Clear(Query);
Prepare(Query,"BEGIN WORK");
Execute(Query,Connection);
Clear(Query);
end Begin_Work;
procedure Commit_Work(Query : in out Query_Type; Connection : in out Root_Connection_Type'Class) is
begin
if In_Abort_State(Connection) then
Raise_Exception(Abort_State'Identity,
"PG37: PostgreSQL connection is in the abort state (Commit_Work).");
end if;
Clear(Query);
Prepare(Query,"COMMIT WORK");
Execute(Query,Connection);
Clear(Query);
end Commit_Work;
procedure Rollback_Work(Query : in out Query_Type; Connection : in out Root_Connection_Type'Class) is
begin
Clear(Query);
Prepare(Query,"ROLLBACK WORK");
Execute(Query,Connection);
Clear_Abort_State(Connection);
Clear(Query);
end Rollback_Work;
procedure Rewind(Q : in out Query_Type) is
begin
Q.Rewound := True;
Q.Tuple_Index := First_Tuple_Index;
end Rewind;
procedure Fetch(Q : in out Query_Type) is
begin
if not Q.Rewound then
Q.Tuple_Index := Q.Tuple_Index + 1;
else
Q.Rewound := False;
end if;
Fetch(Q,Q.Tuple_Index);
end Fetch;
procedure Fetch(Q : in out Query_Type; TX : Tuple_Index_Type) is
NT : Tuple_Count_Type := Tuples(Q); -- May raise No_Result
begin
if NT < 1 then
Raise_Exception(No_Tuple'Identity,
"PG33: There is no row" & Tuple_Index_Type'Image(TX) & " (Fetch).");
end if;
Q.Tuple_Index := TX;
Q.Rewound := False;
if TX > NT then
Raise_Exception(No_Tuple'Identity,
"PG34: There is no row" & Tuple_Index_Type'Image(TX) & " (Fetch).");
end if;
end Fetch;
function End_of_Query(Q : Query_Type) return Boolean is
NT : Tuple_Count_Type := Tuples(Q); -- May raise No_Result
begin
if NT < 1 then
return True; -- There are no tuples to return
end if;
if Q.Rewound then
return False; -- There is at least 1 tuple to return yet
end if;
return Tuple_Count_Type(Q.Tuple_Index) >= NT; -- We've fetched them all
end End_of_Query;
function Tuple(Q : Query_Type) return Tuple_Index_Type is
NT : Tuple_Count_Type := Tuples(Q); -- May raise No_Result
begin
if NT < 1 or else Q.Rewound then
Raise_Exception(No_Tuple'Identity,
"PG35: There are no tuples to return (Tuple).");
end if;
return Q.Tuple_Index;
end Tuple;
function Tuples(Q : Query_Type) return Tuple_Count_Type is
use Interfaces.C;
function PQntuples(R : PQ_Result) return int;
pragma Import(C,PQntuples,"PQntuples");
begin
if Q.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG19: There are no query results (Tuples).");
end if;
return Tuple_Count_Type(PQntuples(Q.Result));
end Tuples;
function Columns(Q : Query_Type) return Natural is
use Interfaces.C;
function PQnfields(R : PQ_Result) return int;
pragma Import(C,PQnfields,"PQnfields");
begin
if Q.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG20: There are no query results (Columns).");
end if;
return Natural(PQnfields(Q.Result));
end Columns;
function Column_Name(Q : Query_Type; CX : Column_Index_Type) return String is
use Interfaces.C.Strings;
function PQfname(R : PQ_Result; CBX : int) return chars_ptr;
pragma Import(C,PQfname,"PQfname");
CBX : int := int(CX) - 1; -- Make zero based
begin
if Q.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG21: There are no query results (Column_Name).");
end if;
declare
use Interfaces.C.Strings;
CP : chars_ptr := PQfname(Q.Result,CBX);
begin
if CP = Null_Ptr then
Raise_Exception(No_Column'Identity,
"PG22: There is no column CX=" & Column_Index_Type'Image(CX) & ".");
end if;
return To_Case(Value_Of(CP),Q.SQL_Case);
end;
end Column_Name;
function Column_Index(Q : Query_Type; Name : String) return Column_Index_Type is
use Interfaces.C.Strings;
function PQfnumber(R : PQ_Result; CBX : System.Address) return int;
pragma Import(C,PQfnumber,"PQfnumber");
C_Name : char_array := To_C(Name);
CBX : int := -1;
begin
if Q.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG23: There are no query results (Column_Index).");
end if;
CBX := PQfnumber(Q.Result,C_Name'Address);
if CBX < 0 then
Raise_Exception(No_Column'Identity,
"PG24: There is no column named '" & Name & " (Column_Index).");
end if;
return Column_Index_Type(CBX+1);
end Column_Index;
function Is_Column(Q : Query_Type; CX : Column_Index_Type) return Boolean is
begin
if Q.Result = Null_Result then
return False;
end if;
return Natural(CX) <= Columns(Q);
end Is_Column;
function Column_Type(Q : Query_Type; CX : Column_Index_Type) return Row_ID_Type is
function PQftype(R : PQ_Result; Field_Index : int) return PQOid_Type;
pragma Import(C,PQftype,"PQftype");
CBX : int := int(CX) - 1;
begin
if Q.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG25: There are no query results (Column_Type).");
end if;
if not Is_Column(Q,CX) then
Raise_Exception(No_Column'Identity,
"PG26: There is no column CX=" & Column_Index_Type'Image(CX) & " (Column_Type).");
end if;
return Row_ID_Type(PQftype(Q.Result,CBX));
end Column_Type;
function Is_Null(Q : Query_Type; CX : Column_Index_Type) return Boolean is
use Interfaces.C.Strings;
function PQgetisnull(R : PQ_Result; tup_num, field_num : int) return int;
pragma Import(C,PQgetisnull,"PQgetisnull");
C_TX : int := int(Q.Tuple_Index) - 1; -- Make zero based tuple #
C_CX : int := int(CX) - 1; -- Field index
begin
if Q.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG31: There are no query results (Is_Null).");
end if;
if not Is_Column(Q,CX) then
Raise_Exception(No_Column'Identity,
"PG32: There is now column" & Column_Index_Type'Image(CX) & " (Is_Null).");
end if;
return PQgetisnull(Q.Result,C_TX,C_CX) /= 0;
end Is_Null;
function Value(Query : Query_Type; CX : Column_Index_Type) return String is
use Interfaces.C.Strings;
function PQgetvalue(R : PQ_Result; tup_num, field_num : int) return chars_ptr;
pragma Import(C,PQgetvalue,"PQgetvalue");
function PQgetisnull(R : PQ_Result; tup_num, field_num : int) return int;
pragma Import(C,PQgetisnull,"PQgetisnull");
C_TX : int := int(Query.Tuple_Index) - 1; -- Make zero based tuple #
C_CX : int := int(CX) - 1; -- Field index
begin
if Query.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG27: There are no query results (Value).");
end if;
if not Is_Column(Query,CX) then
Raise_Exception(No_Column'Identity,
"PG28: There is no column CX=" & Column_Index_Type'Image(CX) & " (Value).");
end if;
declare
use Ada.Strings, Ada.Strings.Fixed;
C_Val : chars_ptr := PQgetvalue(Query.Result,C_TX,C_CX);
begin
if C_Val = Null_Ptr then
Raise_Exception(No_Tuple'Identity,
"PG29: There is no row" & Tuple_Index_Type'Image(Query.Tuple_Index) & " (Value).");
elsif PQgetisnull(Query.Result,C_TX,C_CX) /= 0 then
Raise_Exception(Null_Value'Identity,
"PG30: Value for column" & Column_Index_Type'Image(CX) & " is NULL (Value).");
else
return Trim(Value_Of(C_Val),Right);
end if;
end;
end Value;
function Result(Query : Query_Type) return Natural is
begin
return Result_Type'Pos(Result(Query));
end Result;
function Result(Query : Query_Type) return Result_Type is
function PQresultStatus(R : PQ_Result) return Result_Type;
pragma Import(C,PQresultStatus,"PQresultStatus");
begin
if Query.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG13: There are no query results (function Result).");
end if;
return PQresultStatus(Query.Result);
end Result;
function Command_Oid(Query : Query_Type) return Row_ID_Type is
function PQoidValue(R : PQ_Result) return PQOid_Type;
pragma Import(C,PQoidValue,"PQoidValue");
begin
if Query.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG12: There are no query results (Command_Oid).");
end if;
return Row_ID_Type(PQoidValue(Query.Result));
end Command_Oid;
function Null_Oid(Query : Query_Type) return Row_ID_Type is
begin
return APQ.PostgreSQL.Null_Row_ID;
end Null_Oid;
function Command_Status(Query : Query_Type) return String is
use Interfaces.C.Strings;
function PQcmdStatus(R : PQ_Result) return chars_ptr;
pragma Import(C,PQcmdStatus,"PQcmdStatus");
begin
if Query.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG11: There are no query results (Command_Status).");
end if;
declare
use Interfaces.C.Strings;
Msg_Ptr : chars_ptr := PQcmdStatus(Query.Result);
begin
if Msg_Ptr = Null_Ptr then
return "";
else
return Strip_NL(Value_Of(Msg_Ptr));
end if;
end;
end Command_Status;
function Error_Message(Query : Query_Type) return String is
use Interfaces.C.Strings;
function PQresultErrorMessage(R : PQ_Result) return chars_ptr;
pragma Import(C,PQresultErrorMessage,"PQresultErrorMessage");
begin
if Query.Result = Null_Result then
Raise_Exception(No_Result'Identity,
"PG10: There are no query results (Error_Message).");
end if;
declare
use Interfaces.C.Strings;
Msg_Ptr : chars_ptr := PQresultErrorMessage(Query.Result);
begin
if Msg_Ptr = Null_Ptr then
return "";
else
return Strip_NL(Value_Of(Msg_Ptr));
end if;
end;
end Error_Message;
function Is_Duplicate_Key(Query : Query_Type) return Boolean is
Msg : String := Error_Message(Query);
Dup : constant String := "ERROR: Cannot insert a duplicate key";
begin
if Msg'Length < Dup'Length then
return False;
end if;
return Msg(Msg'First..Msg'First+Dup'Length-1) = Dup;
end Is_Duplicate_Key;
function Engine_Of(Q : Query_Type) return Database_Type is
begin
return Engine_PostgreSQL;
end Engine_Of;
--------------------------------------------------
-- BLOB SUPPORT :
--------------------------------------------------
function lo_creat(conn : PG_Conn; Mode : Mode_Type) return PQOid_Type;
pragma Import(C,lo_creat,"lo_creat");
function lo_open(conn : PG_Conn; Oid : PQOid_Type; Mode : Mode_Type) return Blob_Fd;
pragma Import(C,lo_open,"lo_open");
function lo_close(conn : PG_Conn; fd : Blob_Fd) return int;
pragma Import(C,lo_close,"lo_close");
function lo_read(conn : PG_Conn; fd : Blob_Fd; buf : System.Address; len : size_t) return int;
pragma Import(C,lo_read,"lo_read");
function lo_write(conn : PG_Conn; fd : Blob_Fd; buf : System.Address; len : size_t) return int;
pragma Import(C,lo_write,"lo_write");
function lo_unlink(conn : PG_Conn; Oid : PQOid_Type) return int;
pragma Import(C,lo_unlink,"lo_unlink");
function lo_lseek(conn : PG_Conn; fd : Blob_Fd; offset, whence : int) return int;
pragma Import(C,lo_lseek,"lo_lseek");
procedure Free is new Ada.Unchecked_Deallocation(Blob_Object,Blob_Type);
-- internal
function Raw_Index(Blob : Blob_Type) return Str.Stream_Element_Offset is
use Ada.Streams;
Offset : int;
begin
loop -- In loop form in case EINTR processing should be required someday
Offset := lo_lseek(Blob.Conn.Connection,Blob.Fd,0,Seek_Cur);
exit when Offset >= 0;
Raise_Exception(Blob_Error'Identity,
"PG38: Server blob error occurred.");
end loop;
return Stream_Element_Offset(Offset + 1);
end Raw_Index;
procedure Raw_Set_Index(Blob : Blob_Object; To : Str.Stream_Element_Offset) is
Offset : int := int(To) - 1;
Z : int;
begin
loop -- In loop form in case EINTR processing should be required someday
Z := lo_lseek(Blob.Conn.Connection,Blob.Fd,Offset,Seek_Set);
exit when Z >= 0;
Raise_Exception(Blob_Error'Identity,
"PG39: Server blob error occurred.");
end loop;
end Raw_Set_Index;
function Internal_Size(Blob : Blob_Type) return Str.Stream_Element_Offset is
use Ada.Streams;
Saved_Pos : Stream_Element_Offset := Raw_Index(Blob);
End_Offset : int := lo_lseek(Blob.Conn.Connection,Blob.Fd,0,Seek_End);
begin
if End_Offset < 0 then
Raise_Exception(Blob_Error'Identity,
"PG40: Server blob error occurred.");
end if;
Raw_Set_Index(Blob.all,Saved_Pos);
return Stream_Element_Offset(End_Offset);
end Internal_Size;
procedure Internal_Write(
Stream: in out Blob_Object;
Item: in Ada.Streams.Stream_Element_Array
) is
use Ada.Streams;
Total : size_t := 0;
Len : size_t;
IX : Stream_Element_Offset := Item'First;
N : int;
begin
while IX < Item'Last loop
Len := size_t(Item'Last - IX + 1);
N := lo_write(Stream.Conn.Connection,Stream.Fd,Item(IX)'Address,Len);
if N < 0 then
Raise_Exception(Blob_Error'Identity,
"PG43: Server blob write error occurred.");
elsif N > 0 then
IX := IX + Stream_Element_Offset(N);
Stream.Phy_Offset := Stream.Phy_Offset + Stream_Element_Offset(N);
if Stream.Phy_Offset - 1 > Stream.The_Size then
Stream.The_Size := Stream.Phy_Offset - 1;
end if;
end if;
if N = 0 then
Raise_Exception(Ada.IO_Exceptions.End_Error'Identity,
"PG44: End_Error raised while server was writing blob.");
end if;
end loop;
end Internal_Write;
procedure Internal_Read(
Stream: in out Blob_Object;
Item: out Ada.Streams.Stream_Element_Array;
Last: out Ada.Streams.Stream_Element_Offset
) is
use Ada.Streams;
Len : size_t := size_t(Item'Length);
N : int;
begin
loop -- In loop form in case EINTR processing should be required someday
N := lo_read(Stream.Conn.Connection,Stream.Fd,Item(Item'First)'Address,Len);
exit when N >= 0;
Raise_Exception(Blob_Error'Identity,
"PG41: Server blob error occurred while reading the blob.");
end loop;
if N = 0 then
Raise_Exception(Ada.IO_Exceptions.End_Error'Identity,
"PG42: Reached the end of blob while reading.");
end if;
Last := Item'First + Stream_Element_Offset(N) - 1;
Stream.Phy_Offset := Stream.Phy_Offset + Stream_Element_Offset(N);
end Internal_Read;
procedure Internal_Blob_Open(Blob : in out Blob_Type; Mode : Mode_Type; Buf_Size : Natural := Buf_Size_Default) is
use Ada.Streams;
begin
Blob.Mode := Internal_Blob_Open.Mode;
Blob.Fd := lo_open(Blob.Conn.Connection,PQOid_Type(Blob.Oid),Blob.Mode);
if Blob.Fd = -1 then
Free(Blob);
Raise_Exception(Blob_Error'Identity,
"PG45: Unable to open blob on server (OID=" & Row_ID_Type'Image(Blob.Oid) & ").");
end if;
if Buf_Size > 0 then
Blob.Buffer := new Stream_Element_Array(1..Stream_Element_Offset(Buf_Size));
Blob.Buf_Empty := True;
Blob.Buf_Dirty := False;
Blob.Buf_Offset := 0;
Blob.Log_Offset := 1;
Blob.Phy_Offset := 1;
Blob.The_Size := Stream_Element_Offset(Internal_Size(Blob));
else
null; -- unbuffered blob operations will be used
end if;
end Internal_Blob_Open;
procedure Internal_Set_Index(Blob : in out Blob_Object; To : Str.Stream_Element_Offset) is
use Ada.Streams;
begin
if Blob.Phy_Offset /= Stream_Element_Offset(To) then
Raw_Set_Index(Blob,To);
Blob.Phy_Offset := Stream_Element_Offset(To);
end if;
end Internal_Set_Index;
-- end internal
function Blob_Create(DB : access Connection_Type; Buf_Size : Natural := Buf_Size_Default) return Blob_Type is
Blob : Blob_Type;
begin
Blob := new Blob_Object(DB);
Blob.Oid := Row_ID_Type(lo_creat(Blob.Conn.Connection,Read_Write));
if Blob.Oid = -1 then
free(Blob);
Raise_Exception(Blob_Error'Identity,
"PG46: Unable to create blob on server.");
end if;
begin
Internal_Blob_Open(Blob,Write,Buf_Size);
exception
when Ex : others =>
Blob_Unlink(DB.all,Blob.Oid); -- Release what will result in an unused blob!
Reraise_Occurrence(Ex); -- HINT: Internal_Blob_Open() FAILS IF IT IS NOT IN A TRANSACTION!
end;
return Blob;
end Blob_Create;
function Blob_Open(DB : access Connection_Type; Oid : Row_ID_Type; Mode : Mode_Type; Buf_Size : Natural := Buf_Size_Default) return Blob_Type is
Blob : Blob_Type;
begin
Blob := new Blob_Object(DB);
Blob.Oid := Blob_Open.Oid;
Internal_Blob_Open(Blob,Mode,Buf_Size);
return Blob;
end Blob_Open;
procedure Blob_Flush(Blob : in out Blob_Object) is
begin
if Blob.Buffer /= null then
if ( not Blob.Buf_Empty ) and Blob.Buf_Dirty then
Internal_Set_Index(Blob,Blob.Buf_Offset);
Internal_Write(Blob,Blob.Buffer(1..Blob.Buf_Size));
end if;
Blob.Buf_Dirty := False;
else
null; -- Ignore flush calls in the unbuffered case
end if;
end Blob_Flush;
procedure Blob_Flush(Blob : Blob_Type) is
begin
Blob_Flush(Blob.all);
end Blob_Flush;
procedure Internal_Blob_Close(Blob : in out Blob_Object) is
Z : int;
begin
if Blob.Buffer /= null then
if Blob.Buf_Dirty then
Blob_Flush(Blob);
end if;
Free(Blob.Buffer);
end if;
Z := lo_close(Blob.Conn.Connection,Blob.Fd);
if Z /= 0 then
Raise_Exception(Blob_Error'Identity,
"PG47: Server error when closing blob.");
end if;
Blob.Fd := -1;
end Internal_Blob_Close;
procedure Blob_Close(Blob : in out Blob_Type) is
begin
Internal_Blob_Close(Blob.all);
Free(Blob);
end Blob_Close;
procedure Blob_Set_Index(Blob : Blob_Type; To : Blob_Offset) is
use Ada.Streams;
begin
if Blob.Buffer /= null then
Blob.Log_Offset := Stream_Element_Offset(To);
else
Internal_Set_Index(Blob.all,Stream_Element_Offset(To));
end if;
end Blob_Set_Index;
function Internal_Index(Blob : Blob_Type) return Str.Stream_Element_Offset is
begin
return Blob.Phy_Offset;
end Internal_Index;
function Blob_Index(Blob : Blob_Type) return Blob_Offset is
begin
if Blob.Buffer /= null then
return Blob_Offset(Blob.Log_Offset);
else
return Blob_Offset(Internal_Index(Blob));
end if;
end Blob_Index;
function End_of_Blob(Blob : Blob_Type) return Boolean is
use Ada.Streams;
begin
if Blob.Buffer /= null then
return Blob.Log_Offset > Blob.The_Size;
else
return Blob_Index(Blob) > Blob_Size(Blob);
end if;
end End_of_Blob;
function Blob_Oid(Blob : Blob_Type) return Row_ID_Type is
begin
return Blob.Oid;
end Blob_Oid;
function Blob_Size(Blob : Blob_Type) return Blob_Count is
begin
if Blob.Buffer /= null then
return Blob_Count(Blob.The_Size);
else
return Blob_Count(Internal_Size(Blob));
end if;
end Blob_Size;
function Blob_Stream(Blob : Blob_Type) return Root_Stream_Access is
begin
if Blob = Null then
Raise_Exception(Blob_Error'Identity,
"PG49: No blob to create a stream from (Blob_Stream).");
end if;
return Root_Stream_Access(Blob);
end Blob_Stream;
procedure Blob_Unlink(DB : Connection_Type; Oid : Row_ID_Type) is
Z : int;
begin
Z := lo_unlink(DB.Connection,PQOid_Type(Oid));
if Z = -1 then
Raise_Exception(Blob_Error'Identity,
"PG50: Unable to unlink blob OID=" & Row_ID_Type'Image(Oid) & " (Blob_Unlink).");
end if;
end Blob_Unlink;
function lo_import(conn : PG_Conn; filename : System.Address) return int;
pragma Import(C,lo_import,"lo_import");
function lo_export(conn : PG_Conn; Oid : PQOid_Type; filename : System.Address) return int;
pragma Import(C,lo_export,"lo_export");
procedure Blob_Import(DB : Connection_Type; Pathname : String; Oid : out Row_ID_Type) is
use Interfaces.C;
P : char_array := To_C(Pathname);
Z : int;
begin
Oid := Row_ID_Type'Last;
Z := lo_import(DB.Connection,P'Address);
if Z <= -1 then
Raise_Exception(Blob_Error'Identity,
"PG51: Unable to import blob from " & Pathname & " (Blob_Import).");
end if;
Oid := Row_ID_Type(Z);
end Blob_Import;
procedure Blob_Export(DB : Connection_Type; Oid : Row_ID_Type; Pathname : String) is
P : char_array := To_C(Pathname);
Z : int;
begin
Z := lo_export(DB.Connection,PQOid_Type(Oid),P'Address);
if Z <= -1 then
Raise_Exception(Blob_Error'Identity,
"PG52: Unable to export blob to " & Pathname & " (Blob_Export).");
end if;
end Blob_Export;
function Generic_Blob_Open(DB : access Connection_Type; Oid : Oid_Type; Mode : Mode_Type; Buf_Size : Natural := Buf_Size_Default) return Blob_Type is
begin
return Blob_Open(DB,Row_ID_Type(Oid),Mode,Buf_Size);
end Generic_Blob_Open;
function Generic_Blob_Oid(Blob : Blob_Type) return Oid_Type is
begin
return Oid_Type(Blob_Oid(Blob));
end Generic_Blob_Oid;
procedure Generic_Blob_Unlink(DB : Connection_Type; Oid : Oid_Type) is
begin
Blob_Unlink(DB,Row_ID_Type(Oid));
end Generic_Blob_Unlink;
procedure Generic_Blob_Import(DB : Connection_Type; Pathname : String; Oid : out Oid_Type) is
Local_Oid : Row_ID_Type;
begin
Blob_Import(DB,Pathname,Local_Oid);
Oid := Oid_Type(Local_Oid);
end Generic_Blob_Import;
procedure Generic_Blob_Export(DB : Connection_Type; Oid : Oid_Type; Pathname : String) is
begin
Blob_Export(DB,Row_ID_Type(Oid),Pathname);
end Generic_Blob_Export;
-- private
---------------------
-- CONNECTION_TYPE --
---------------------
procedure Initialize(C : in out Connection_Type) is
begin
C.Port_Format := IP_Port;
C.Port_Number := 5432;
end Initialize;
procedure Finalize(C : in out Connection_Type) is
begin
Internal_Reset(C,In_Finalize => True);
end Finalize;
function Internal_Connection(C : Connection_Type) return PG_Conn is
begin
return C.Connection;
end Internal_Connection;
function Query_Factory( C: in Connection_Type ) return Root_Query_Type'Class is
q: Query_Type;
begin
return q;
end query_factory;
----------------
-- QUERY_TYPE --
----------------
procedure Adjust(Q : in out Query_Type) is
begin
Q.Result := Null_Result;
Adjust(Root_Query_Type(Q));
end Adjust;
procedure Finalize(Q : in out Query_Type) is
begin
Clear(Q);
end Finalize;
function SQL_Code(Query : Query_Type) return SQL_Code_Type is
begin
return 0;
end SQL_Code;
---------------
-- BLOB_TYPE --
---------------
procedure Finalize(Blob : in out Blob_Object) is
begin
if Blob.Fd /= -1 then
Internal_Blob_Close(Blob);
end if;
end Finalize;
procedure Read(
Stream: in out Blob_Object;
Item: out Ada.Streams.Stream_Element_Array;
Last: out Ada.Streams.Stream_Element_Offset
) is
use Ada.Streams;
IX : Stream_Element_Offset := Item'First;
BX : Stream_Element_Offset;
begin
if Stream.Buffer /= null then
while IX <= Item'Last and Stream.Log_Offset <= Stream.The_Size loop
if ( not Stream.Buf_Empty ) and then Stream.Buf_Dirty then -- if not empty and is dirty
if Stream.Log_Offset < Stream.Buf_Offset -- if offset too low
or else Stream.Log_Offset >= Stream.Buf_Offset + Stream.Buf_Size then -- or offset too high
Blob_Flush(Stream);
Stream.Buf_Empty := True;
end if;
end if;
if Stream.Buf_Empty then -- If we have an empty buffer then..
if Stream.Log_Offset > Stream.The_Size + 1 then
Raise_Exception(Ada.IO_Exceptions.End_Error'Identity,
"PG47: End reached while reading blob.");
end if;
Stream.Buf_Offset := Stream.Log_Offset; -- Start with our convenient offset
Stream.Buf_Size := Stream.Buffer.all'Length; -- Try to read entire buffer in
if Stream.Buf_Offset + Stream.Buf_Size - 1 > Stream.The_Size then
Stream.Buf_Size := Stream.The_Size + 1 - Stream.Buf_Offset; -- read somewhat less in
end if;
Internal_Set_Index(Stream,Stream.Buf_Offset);
Internal_Read(Stream,Stream.Buffer(1..Stream.Buf_Size),Last);
if Last /= Stream.Buf_Size then -- Check that all was read
Raise_Exception(Blob_Error'Identity,
"PG48: Error while reading from blob.");
end if;
Stream.Buf_Empty := False; -- Buffer is not empty
pragma assert(Stream.Buf_Dirty = False); -- Should not be dirty at this point
BX := Stream.Buffer.all'First; -- Start reading from buffer here
else
BX := Stream.Log_Offset - Stream.Buf_Offset + Stream.Buffer.all'First;
end if;
Item(IX) := Stream.Buffer.all(BX); -- Read item byte
IX := IX + 1; -- Advance item index
Stream.Log_Offset := Stream.Log_Offset + 1; -- Advance logical offset
end loop;
Last := IX - 1;
else
Internal_Read(Stream,Item,Last);
end if;
end Read;
procedure Write(
Stream: in out Blob_Object;
Item: in Ada.Streams.Stream_Element_Array
) is
use Ada.Streams;
IX : Stream_Element_Offset := Item'First;
BX : Stream_Element_Offset := -1;
begin
if Stream.Buffer /= null then
while IX <= Item'Last loop
if ( not Stream.Buf_Empty ) and then Stream.Buf_Dirty then -- Buffer is not empty and is dirty
if Stream.Log_Offset < Stream.Buf_Offset -- if offset too low
or else Stream.Log_Offset > Stream.Buf_Offset + Stream.Buf_Size -- or offset too high
or else Stream.Buf_Size >= Stream.Buffer.all'Length then -- or buffer is full then..
Blob_Flush(Stream); -- Flush out dirty data
Stream.Buf_Empty := True; -- Now mark buffer as empty
else
BX := Stream.Log_Offset - Stream.Buf_Offset + Stream.Buffer.all'First;
end if;
else
BX := Stream.Log_Offset - Stream.Buf_Offset + Stream.Buffer.all'First;
end if;
if Stream.Buf_Empty then -- if buf was empty or was just made empty then..
Stream.Buf_Offset := Stream.Log_Offset; -- Set to our convenient offset
Stream.Buf_Size := 0; -- No data in this buffer yet
Stream.Buf_Dirty := False; -- Make sure it's not marked dirty yet
BX := Stream.Buffer.all'First; -- Point to start of buffer
end if;
Stream.Buffer.all(BX) := Item(IX); -- Write the byte
IX := IX + 1; -- Advance Item Index
Stream.Log_Offset := Stream.Log_Offset + 1; -- Advance the logical blob offset
Stream.Buf_Empty := False; -- Buffer is no longer empty
Stream.Buf_Dirty := True; -- Buffer has been modified
if BX > Stream.Buf_Size then -- Did the buffer contents grow?
Stream.Buf_Size := Stream.Buf_Size + 1; -- Buffer size has grown
end if;
end loop;
else
Internal_Write(Stream,Item);
end if;
end Write;
begin
declare
use Ada.Calendar;
begin
No_Date := Time_Of(Year_Number'First,Month_Number'First,Day_Number'First);
end;
end APQ.PostgreSQL.Client;
-- End $Source: /cvsroot/apq/apq/apq-postgresql-client.adb,v $
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