FireDAC 下的 Sqlite [11] - 关于批量提交 SQL 命令的测试,

Posted 2020-11-21 yjhb

可把下面代码直接贴在空白窗体上, 以快速完成窗体设计:

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代码:

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{建立}
procedure TForm1.FormCreate(Sender: TObject);
const
  strTable = ‘CREATE TABLE MyTable(Id integer PRIMARY KEY AUTOINCREMENT, Name string(10), Age integer)‘; //Id(自增), Name, Age
begin
  FDConnection1.DriverName := ‘SQLite‘;
  FDQuery1.ExecSQL(strTable);
  FDQuery1.Open(‘SELECT * FROM MyTable‘);
end;

{逐条插入}
procedure TForm1.Button1Click(Sender: TObject);
const
  strInsert = ‘INSERT INTO MyTable(Name, Age) VALUES(:name, :age)‘;
begin
//  FDQuery1.FetchOptions.AutoClose := True; //默认值
  FDQuery1.ExecSQL(strInsert, [‘A‘, 1]);
  FDQuery1.ExecSQL(strInsert, [‘B‘, 2]);
  FDQuery1.ExecSQL(strInsert, [‘C‘, 3]);
  FDQuery1.ExecSQL(strInsert, [‘D‘, 4]);

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

{用 ; 分割, 一次行插入}
procedure TForm1.Button2Click(Sender: TObject);
const
  strInsert = ‘INSERT INTO MyTable(Name, Age) VALUES("%s", %d)‘;
var
  LStr: string;
begin
  LStr := ‘‘;
  LStr := LStr + Format(strInsert, [‘AA‘, 11]) + ‘;‘;
  LStr := LStr + Format(strInsert, [‘BB‘, 22]) + ‘;‘;
  LStr := LStr + Format(strInsert, [‘CC‘, 33]) + ‘;‘;
  LStr := LStr + Format(strInsert, [‘DD‘, 44]) + ‘;‘;
  LStr := LStr + ‘SELECT * FROM MyTable‘;

  FDQuery1.ExecSQL(LStr);
  FDQuery1.Open();
end;

{使用 NextRecordSet 方法提取并执行所有命令}
procedure TForm1.Button3Click(Sender: TObject);
const
  strInsert = ‘INSERT INTO MyTable(Name, Age) VALUES("%s", %d);‘;
begin
  FDQuery1.FetchOptions.AutoClose := False; //按说这个是必须要设置的, 但测试时不设置也可以
  FDQuery1.SQL.Clear;
  FDQuery1.SQL.Add(Format(strInsert, [‘AAA‘, 111]));
  FDQuery1.SQL.Add(Format(strInsert, [‘BBB‘, 222]));
  FDQuery1.SQL.Add(Format(strInsert, [‘CCC‘, 333]));
  FDQuery1.SQL.Add(Format(strInsert, [‘DDD‘, 444]));

  FDQuery1.SQL.Add(‘SELECT * FROM MyTable‘);

  FDQuery1.Execute();
  FDQuery1.NextRecordSet;
end;

{使用 DML 数组参数}
procedure TForm1.Button4Click(Sender: TObject);
const
  strInsert = ‘INSERT INTO MyTable(Name, Age) VALUES(:name, :age);‘;
begin
  FDQuery1.FetchOptions.AutoClose := False; //

  FDQuery1.SQL.Text := strInsert;
  FDQuery1.Params.ArraySize := 4; //准备把上面的语句执行 4 次

  {分别设置 4 次的参数}
  FDQuery1.Params[0].AsStrings[0] := ‘AAAA‘;
  FDQuery1.Params[1].AsIntegers[0] := 1111;

  FDQuery1.Params[0].AsStrings[1] := ‘BBBB‘;
  FDQuery1.Params[1].AsIntegers[1] := 2222;

  FDQuery1.Params[0].AsStrings[2] := ‘CCCC‘;
  FDQuery1.Params[1].AsIntegers[2] := 3333;

  FDQuery1.Params[0].AsStrings[3] := ‘DDDD‘;
  FDQuery1.Params[1].AsIntegers[3] := 4444;

  FDQuery1.Execute(4, 0); //从 1 条开始执行 4 次

  FDQuery1.SQL.Add(‘SELECT * FROM MyTable‘);
  FDQuery1.NextRecordSet;
end;

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测试效果图:

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另外, 还可以使用 FireDAC 扩展的 SQL Script(TFDScript), 它还能直接调用文件中的 SQL 指令.