Sqlite under FireDAC [7] - backup, optimization, transaction (Transaction) /

TFDSQLiteBackup control with two or three lines of code to complete the backup Sqlite database.

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Procedure TForm1.Button1Click (Sender: TObject);
 the begin
   {initialize certain} 
  FDConnection1.DriverName: = 'the SQLite' ;
  FDConnection1.Params.Add ( 'Database = C: \ the Temp \ FDDemo_Back.sdb' ); // if not specified this path is the backup to memory 
  FDConnection1.Open (); {backup C: \ the Temp \ FDDemo.sdb} 
  FDSQLiteBackup1.DriverLink: = FDPhysSQLiteDriverLink1;
  FDSQLiteBackup1.Database: = 'C: \ the Temp \ FDDemo.sdb' ;         // support URL 
  FDSQLiteBackup1.DestDatabaseObj: = FDConnection1.CliObj;
  FDSQLiteBackup1.Backup; End ;


  

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After some operations, the database may be fragmented, then the optimization can be performed by Sweep method TFDSQLiteValidate control.

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Common Code {} 
the begin 
  FDSQLiteValidate1.DriverLink: = FDPhysSQLiteDriverLink1; 
  FDSQLiteValidate1.Database: = 'C: \ the Temp \ FDDemo.sdb' ; 
  FDSQLiteValidate1.Sweep; // can auto_vacuum = FULL connection parameter; (0: NONE, 1: FULL, 2: INCREMENTAL) specify automatic cleanup 
End ;

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To avoid mistakes in database operations can be rolled back by the transaction (Transaction); it should be a means in common use.

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Common Code {} 
the begin 
  FDConnection1.StartTransaction; // start a transaction 
  the try
     {code that might go wrong} 
    FDConnection1.Commit;    // submit 
  the except 
    FDConnection1.Rollback; // rollback 
  End ;
 End ;