不用在界面上设置,直接复制 源代码 即可
链接:https://pan.baidu.com/s/1AmQjlZ9TcvXcZqjWzIkurA
提取码:t1bm
fdLocalSql可以对fdMemTable内存表进行SQL查询(可以对多个fdMemTable内存表进行联表查询哦),fdLocalSql使用SQLITE引擎,而FIREDAC驱动SQLITE,连SQLITE驱动DLL都不需要附带的。
所有设置用FormCreate里用代码
procedure TForm6.FormCreate(Sender: TObject);
begin
FDConnection1.Open('DriverID=SQLite');
FDLocalSQL1.Connection:= FDConnection1;
FDLocalSQL1.Active:=true;
FDMemTable1.FieldDefs.Add('aID', ftInteger, 0, True);
FDMemTable1.FieldDefs.Add('aName', ftString, 20, false);
FDMemTable1.CreateDataSet();
FDMemTable1.AppendRecord([101, 'aaa']);
FDMemTable1.AppendRecord([102, 'bbb']);
FDMemTable1.AppendRecord([102, 'bbb']);
FDMemTable1.AppendRecord([102, 'bbb']);
FDMemTable1.AppendRecord([103, 'ccc']);
FDMemTable1.LocalSQL:= FDLocalSQL1;
FDMemTable1.Active:=true;
FDQuery1.Connection:= FDConnection1;
FDQuery1.SQL.Text:='select * from FDMemTable1 where aid>101 ' ;
FDQuery1.Active:=true;
DataSource1.DataSet:= FDQuery1;
DbGrid1.DataSource:= DataSource1;
end;
2]可以设置多个内存表,FDMemTable1,FDMemTable2
//================================ FDMemTable1 =====================================
FDMemTable1.FieldDefs.Add('aID', ftInteger, 0, True);
FDMemTable1.FieldDefs.Add('aName', ftString, 20, false);
FDMemTable1.CreateDataSet();
FDMemTable1.AppendRecord([101, 'aaa']);
FDMemTable1.AppendRecord([102, 'bbb']);
FDMemTable1.AppendRecord([102, 'bbb']);
FDMemTable1.AppendRecord([102, 'bbb']);
FDMemTable1.AppendRecord([103, 'ccc']);
FDMemTable1.LocalSQL:= FDLocalSQL1;
FDMemTable1.Active:=true;
//--------------------------- FDMemTable2 --------------------------------------
FDMemTable2.FieldDefs.Add('aID', ftInteger, 0, True);
FDMemTable2.FieldDefs.Add('aName', ftString, 20, false);
FDMemTable2.CreateDataSet();
FDMemTable2.AppendRecord([201, 'aaa']);
FDMemTable2.AppendRecord([102, 'bbb']);
FDMemTable2.AppendRecord([202, 'bbb']);
FDMemTable2.AppendRecord([102, 'bbb']);
FDMemTable2.AppendRecord([103, 'ccc']);
FDMemTable2.LocalSQL:= FDLocalSQL1;
FDMemTable2.Active:=true;
//==================================================================================
FDQuery1.Connection:= FDConnection1;
FDQuery1.SQL.Text:='select * from FDMemTable1, FDMemTable2 where FDMemTable1.aID=FDMemTable2.aID ' ; //这里写SQL语句
FDQuery1.Active:=true;