SQLite FireDAC trailing spaces

问题

I'm using Delphi XE7 with FireDAC to access SQLite.

When I put data into a TEXT field, any trailing spaces or #0 characters get truncated.

Is there something I can change in either SQLite or FireDAC to have it preserve the trailing white space?

// The trailing spaces after Command don't come back from SQLite.
fFireDACQuery.ParamByName(kSQLFieldScriptCommands).AsString := 'Command          ';  

回答1:

Disable the StrsTrim property. This property is described as:

TFDFormatOptions.StrsTrim

Controls the removing of trailing spaces from string values and zero bytes from binary values.

And it seems that you want to store binary data rather than text. If that is correct, better define your field data type e.g. as BINARY[255] for fixed length binary string of 255 bytes (255 is the maximum length of ShortString that you use).

Parameter value for such field you would then access this way:

var
  Data: RawByteString;
begin
  ReadByteDataSomehow(Data);

  FDQuery.FormatOptions.StrsTrim := False;
  FDQuery.SQL.Text := 'INSERT INTO MyTable (MyBinaryField) VALUES (:MyBinaryData)';
  FDQuery.ParamByName('MyBinaryData').AsByteStr := Data;
  FDQuery.ExecSQL;
end;

来源：https://stackoverflow.com/questions/26612620/sqlite-firedac-trailing-spaces