“字符串格式错误”插入 Firebird 时出现异常(Delphi、UniDAC、UniSQL、INSERT、参数)

发布于 2024-09-30 18:22:54 字数 3123 浏览 6 评论 0原文

使用Delphi 2010、UniDAC组件、Firebird 2.5 SuperServer。 数据库字符集是ISO_8559_1(我的Windows默认值)。

我正在编写一个数据传输应用程序,用于将数据从 Access 数据库传输到具有相同表结构的 Firebird 数据库。我使用 ADOQuery 组件从源表中选择所有行,然后循环访问该记录集,并使用带有参数的 INSERT 语句的 UniSQL 组件,从相应的源数据集字段值分配参数值。

运行插入命令时,它会抛出“格式错误的字符串”异常。 我陷入困境,需要帮助来解决问题。

代码如下:

function TDataTransfer.BeginTransfer(AProgressCallback: TProgressCallback): Boolean;
var
  slSQLSelect, slSQLInsert: TStringList;
  i, f, z: Integer;
  cmdS, cmdI: String;
  adods: TADODataSet;
  fbcmd: TUniSQL;
  fbscript: TUniscript;
  q: String;
  s : WideString;
begin
  FProgressCallback := AProgressCallback;

  fbscript := TUniscript.Create(nil);
  try
    fbscript.Connection := FirebirdConnection;
    FirebirdConnection.StartTransaction;
    try
      fbscript.Delimiter := ';';
      fbscript.ExecuteFile(ExtractFilePath(ParamStr(0)) + 'Firebird_Script_0.txt');
      FirebirdConnection.CommitRetaining;

      slSQLSelect := TStringList.Create;
      slSQLInsert := TStringList.Create;
      adods := TADODataSet.Create(nil);
      fbcmd := TUniSQL.Create(nil);
      try
        adods.Connection := AccessConnection;
        fbcmd.Connection := FirebirdConnection;

        slSQLSelect.LoadFromFile(ExtractFilePath(ParamStr(0)) + 'Access_Select.txt');
        slSQLInsert.LoadFromFile(ExtractFilePath(ParamStr(0)) + 'Firebird_Insert.txt');

        z := slSQLSelect.Count - 1;
        for i := 0 to z do begin
          cmdS := slSQLSelect[i];
          cmdI := slSQLInsert[i];

          adods.CommandText := cmdS;
          fbcmd.SQL.Text := cmdI;

          adods.Open;

          while not adods.Eof do begin
            for f := 0 to adods.FieldCount - 1 do
              try
                if adods.FieldDefs[f].DataType = ftWideString then begin
                  s := adods.Fields[f].AsAnsiString ;
                  q := '"';
//                  if AnsiStrPos(PAnsiChar(@s), PAnsiChar(q)) <> nil then
//                    s := StringReplace(s, '"', '""', [rfReplaceAll]);
                  fbcmd.Params[f].Value := s;
                end
                else
                if adods.FieldDefs[f].DataType = ftWideMemo then
                  fbcmd.Params[f].SetBlobData(adods.CreateBlobStream(adods.Fields[f], bmRead))
                else
                  fbcmd.Params[f].Value := adods.Fields[f].Value;
              except
                raise;
              end;

            try
              fbcmd.Execute;
              //  FirebirdConnection.CommitRetaining;
            except
              raise;
            end;
            adods.Next;
          end;
          adods.Close;

          FProgressCallback((i + 1) * 100 div (z + 1), 10);
        end;
      finally
        slSQLSelect.Free;
        slSQLInsert.Free;
        adods.Free;
        fbcmd.Free;
      end;

      fbscript.ExecuteFile(ExtractFilePath(ParamStr(0)) + 'Firebird_Script_1.txt');

      FirebirdConnection.Commit;

      Result := True;
    except
      FirebirdConnection.Rollback;
      Result := False;
    end;
  finally
    fbscript.Free;
  end;


end; 

TIA, 史蒂夫·L

Using Delphi 2010, UniDAC components, Firebird 2.5 SuperServer.
Database character set is ISO_8559_1 (my Windows default).

I am writing a data transfer application to transfer data from an Access database to a Firebird database that has identical table structure. I am using a ADOQuery component to select all rows from source table, and then looping through that recordset, and using UniSQL component with an INSERT statement with parameters, assigning parameter values from the corresponding source dataset field values.

When running the insert command, it throws a 'Malformed string' exception.
I am stuck and need help to resolve the issue.

Code follows:

function TDataTransfer.BeginTransfer(AProgressCallback: TProgressCallback): Boolean;
var
  slSQLSelect, slSQLInsert: TStringList;
  i, f, z: Integer;
  cmdS, cmdI: String;
  adods: TADODataSet;
  fbcmd: TUniSQL;
  fbscript: TUniscript;
  q: String;
  s : WideString;
begin
  FProgressCallback := AProgressCallback;

  fbscript := TUniscript.Create(nil);
  try
    fbscript.Connection := FirebirdConnection;
    FirebirdConnection.StartTransaction;
    try
      fbscript.Delimiter := ';';
      fbscript.ExecuteFile(ExtractFilePath(ParamStr(0)) + 'Firebird_Script_0.txt');
      FirebirdConnection.CommitRetaining;

      slSQLSelect := TStringList.Create;
      slSQLInsert := TStringList.Create;
      adods := TADODataSet.Create(nil);
      fbcmd := TUniSQL.Create(nil);
      try
        adods.Connection := AccessConnection;
        fbcmd.Connection := FirebirdConnection;

        slSQLSelect.LoadFromFile(ExtractFilePath(ParamStr(0)) + 'Access_Select.txt');
        slSQLInsert.LoadFromFile(ExtractFilePath(ParamStr(0)) + 'Firebird_Insert.txt');

        z := slSQLSelect.Count - 1;
        for i := 0 to z do begin
          cmdS := slSQLSelect[i];
          cmdI := slSQLInsert[i];

          adods.CommandText := cmdS;
          fbcmd.SQL.Text := cmdI;

          adods.Open;

          while not adods.Eof do begin
            for f := 0 to adods.FieldCount - 1 do
              try
                if adods.FieldDefs[f].DataType = ftWideString then begin
                  s := adods.Fields[f].AsAnsiString ;
                  q := '"';
//                  if AnsiStrPos(PAnsiChar(@s), PAnsiChar(q)) <> nil then
//                    s := StringReplace(s, '"', '""', [rfReplaceAll]);
                  fbcmd.Params[f].Value := s;
                end
                else
                if adods.FieldDefs[f].DataType = ftWideMemo then
                  fbcmd.Params[f].SetBlobData(adods.CreateBlobStream(adods.Fields[f], bmRead))
                else
                  fbcmd.Params[f].Value := adods.Fields[f].Value;
              except
                raise;
              end;

            try
              fbcmd.Execute;
              //  FirebirdConnection.CommitRetaining;
            except
              raise;
            end;
            adods.Next;
          end;
          adods.Close;

          FProgressCallback((i + 1) * 100 div (z + 1), 10);
        end;
      finally
        slSQLSelect.Free;
        slSQLInsert.Free;
        adods.Free;
        fbcmd.Free;
      end;

      fbscript.ExecuteFile(ExtractFilePath(ParamStr(0)) + 'Firebird_Script_1.txt');

      FirebirdConnection.Commit;

      Result := True;
    except
      FirebirdConnection.Rollback;
      Result := False;
    end;
  finally
    fbscript.Free;
  end;


end; 

TIA,
SteveL

如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。

扫码二维码加入Web技术交流群

发布评论

需要 登录 才能够评论, 你可以免费 注册 一个本站的账号。

评论(1

扎心 2024-10-07 18:22:54

如果您尝试将 s := StringReplace(s, '"', '""', [rfReplaceAll]); 替换为 s := StringReplace(s, '''''', '''', [rfReplaceAll]) ; 并取消注释该行;

If you try to replace s := StringReplace(s, '"', '""', [rfReplaceAll]); with s := StringReplace(s, '''''', '''', [rfReplaceAll]); and uncomment the line;

~没有更多了~
我们使用 Cookies 和其他技术来定制您的体验包括您的登录状态等。通过阅读我们的 隐私政策 了解更多相关信息。 单击 接受 或继续使用网站,即表示您同意使用 Cookies 和您的相关数据。
原文