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