Delphi FireDAC 下的 Sqlite（五） 数据的插入、更新和删除

先在空白窗体上添加: TFDConnection、TFDPhysSQLiteDriverLink、TFDGUIxWaitCursor、TFDQuery、TDataSource、TDBGrid(并在设计时关联好). 你也可以复制下面文本框中的内容, 然后直接往窗体上贴, 以快速完成以上的添加过程: object DBGrid1: TDBGrid Left = 16 Top = 88 Width = 361 Height = 329 DataSource = DataSource1 TabOrder = 0 TitleFont.Charset = DEFAULT_CHARSET TitleFont.Color = clWindowText TitleFont.Height = -11 TitleFont.Name = 'Tahoma' TitleFont.Style = [] end object FDConnection1: TFDConnection Left = 34 Top = 24 end object FDPhysSQLiteDriverLink1: TFDPhysSQLiteDriverLink Left = 143 Top = 24 end object FDGUIxWaitCursor1: TFDGUIxWaitCursor Provider = 'Forms' Left = 260 Top = 24 end object FDQuery1: TFDQuery Connection = FDConnection1 Left = 344 Top = 24 end object DataSource1: TDataSource DataSet = FDQuery1 Left = 420 Top = 24 end object Button1: TButton Left = 400 Top = 88 Width = 75 Height = 25 Caption = 'Button1' TabOrder = 1 OnClick = Button1Click end object Button2: TButton Left = 400 Top = 136 Width = 75 Height = 25 Caption = 'Button2' TabOrder = 2 OnClick = Button2Click end object Button3: TButton Left = 400 Top = 192 Width = 75 Height = 25 Caption = 'Button3' TabOrder = 3 OnClick = Button3Click end object Button4: TButton Left = 400 Top = 240 Width = 75 Height = 25 Caption = 'Button4' TabOrder = 4 OnClick = Button4Click end end

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代码:

{建立}procedure TForm1.FormCreate(Sender: TObject);
const
  dbPath = 'C:\Temp\SQLiteTest.sdb';
  strTable = 'CREATE TABLE MyTable(Id integer PRIMARY KEY AUTOINCREMENT, Name string(10), Age byte)'; //Id, Name, Age 三个字段  //integer PRIMARY KEY AUTOINCREMENT: 自增字段begin
  if FileExists(dbPath) then DeleteFile(dbPath);

  FDConnection1.ConnectionString := 'DriverID=SQLite; Database=' + dbPath;
  FDConnection1.ExecSQL(strTable);

  FDQuery1.Open('SELECT * FROM MyTable');
end;

{插入}procedure TForm1.Button1Click(Sender: TObject);
const
  strInsert = 'INSERT INTO MyTable(Name, Age) VALUES(:name, :age)'; //:name, :age 的方式(后面还要以数组的方式给出相应的值), 这比字符串的 Format 函数还要方便.begin
  FDConnection1.ExecSQL(strInsert, ['AAA', 11]);
  FDConnection1.ExecSQL(strInsert, ['BBB', 22]);
  FDConnection1.ExecSQL(strInsert, ['CCC', 33]);
  FDConnection1.ExecSQL(strInsert, ['DDD', 44]);
  FDConnection1.ExecSQL(strInsert, ['EEE', 55]);
  FDQuery1.Refresh;
end;

{更新}procedure TForm1.Button2Click(Sender: TObject);
begin
  FDConnection1.ExecSQL('UPDATE MyTable SET Age=:a WHERE Name=:n', [Random(100), 'AAA']);
  FDQuery1.Refresh;
end;

{删除}procedure TForm1.Button3Click(Sender: TObject);
begin
  FDConnection1.ExecSQL('DELETE FROM MyTable WHERE Age>33');
  FDQuery1.Refresh;
end;

{查询符合条件的第一个结果}procedure TForm1.Button4Click(Sender: TObject);
var
  V: Variant;
begin
  V := FDConnection1.ExecSQLScalar('SELECT Age FROM MyTable WHERE Name = :x', ['BBB']);
  ShowMessage(V);
end;

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