Delphi FireDAC 下的 Sqlite（六） 加密

主要就是設置 TFDConnection 的兩個鏈接參數: Password, NewPassword, 非常簡單.

const
  dbPath = 'C:\Temp\SQLiteTest.sdb';

{建立加密數據庫, 密碼是 mm123}procedure TForm1.FormCreate(Sender: TObject);
const
  strTable = 'CREATE TABLE MyTable(Id integer, Name string(10), Age byte)'; //Id, Name, Age 三個字段begin
  if FileExists(dbPath) then DeleteFile(dbPath);

  FDConnection1.Params.Add('DriverID=SQLite');
  FDConnection1.Params.Add('Database=' + dbPath);
  FDConnection1.Params.Add('Password=mm123'); //相同與 Password=aes-256:mm123; aes-256 是默認的加密算法;  //還有: aes-128,aes-192,aes-256, aes-ctr-128,aes-ctr-192,aes-ctr-256, aes-ecb-128,aes-ecb-192,aes-ecb-256
  //建表並輸入測試數據
  FDConnection1.ExecSQL(strTable);
  FDConnection1.ExecSQL('INSERT INTO MyTable(Id, Name, Age) VALUES(:1, :2, :3)', [1, 'abc', 23]);
end;

{打開有密碼的數據庫}procedure TForm1.Button1Click(Sender: TObject);
begin
  FDConnection1.Params.Clear;
  FDConnection1.Connected := False;

  FDConnection1.Params.Add('DriverID=SQLite');
  FDConnection1.Params.Add('Database=' + dbPath);
  FDConnection1.Params.Add('Password=mm123');
  FDConnection1.Connected := True;
  FDQuery1.Open('SELECT * FROM MyTable');
end;

{修改密碼}procedure TForm1.Button2Click(Sender: TObject);
begin
  FDConnection1.Params.Clear;
  FDConnection1.Connected := False;

  FDConnection1.Params.Add('DriverID=SQLite');
  FDConnection1.Params.Add('Database=' + dbPath);
  FDConnection1.Params.Add('Password=mm123');
  FDConnection1.Params.Add('NewPassword=mm12345'); //新密碼, 密碼為空表示取消密碼
  FDConnection1.Connected := True;
  FDConnection1.Connected := False;
end;