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{ Contains helpers for using transactions and SQL queries}
unit db_helpers;
{$mode ObjFPC}{$H+}
interface
uses
Classes, SysUtils, DB, BufDataset, Forms, Controls, Graphics, Dialogs,
DBCtrls, SQLite3Conn, SQLDB, process, ExtCtrls, ComCtrls, Menus, DBGrids ;
{ Check connection to database }
procedure checkConnect(var konnect : TSQLite3Connection; var tranzact : TSQLTransaction; msg: String);
{ Executes sQ sql query }
procedure sql_execute(request: string; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction; var sQ: TSQLQuery);
{ Executes sQ sql query directly }
procedure sql_execute_direct(request: string; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction );
{ Starts prepared transaction }
procedure prepared_transaction_start(request : String; var sQ : TSQLQuery; tranzact : TSQLTransaction);
{ Ends prepared transaction }
procedure prepared_transaction_end(var sQ : TSQLQuery; tranzact : TSQLTransaction);
{ Opens sql request }
procedure open_sql(request : string; var sQ : TSQLQuery);
implementation
procedure checkConnect(var konnect : TSQLite3Connection; var tranzact : TSQLTransaction; msg: String);
begin
if not konnect.Connected then
begin
// SilentMessage('нет соединения, переподключаюсь! <'+msg+'>');
konnect.Open;
tranzact.Active:=true;
konnect.ExecuteDirect('End transaction');
konnect.ExecuteDirect('pragma synchronous = 0');
konnect.ExecuteDirect('pragma foreign_keys = off');
konnect.ExecuteDirect('pragma journal_mode = off');
tranzact.Active:=true;
konnect.ExecuteDirect('Begin transaction');
end;
end;
procedure sql_execute(request: string; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction; var sQ: TSQLQuery);
begin
//if not konnect.Connected then konnect.Open;
if not tranzact.Active then tranzact.StartTransaction;
try
sQ.SQL.Text:=request;
sQ.ExecSQL;
finally
if tranzact.Active then tranzact.Commit; { or fTrans.CommitRetaining; }
end;
end;
procedure sql_execute_direct(request: string; var konnect: TSQLite3Connection;
var tranzact: TSQLTransaction );
begin
//if not tranzact.Active then tranzact.StartTransaction;
try
konnect.ExecuteDirect( request );
finally
//if tranzact.Active then tranzact.Commit; { or fTrans.CommitRetaining; }
end;
end;
procedure prepared_transaction_start(request : String; var sQ : TSQLQuery; tranzact : TSQLTransaction);
begin
sQ.ReadOnly:=False;
sQ.sql.text := request;
sQ.prepare;
end;
procedure prepared_transaction_end(var sQ : TSQLQuery; tranzact : TSQLTransaction);
begin
sQ.ExecSQL; // подготовим запрос
// выполним транзакцию
tranzact.CommitRetaining; //or possibly CommitRetainin
end;
procedure open_sql(request: string; var sQ: TSQLQuery);
begin
sQ.SQL.Text := request;
sQ.Open;
end;
end.
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