Major bug with TField that crashes application
XE8 has a very serious bug that was not in XE5 and it's pretty easy to duplicate:
Add a TADOQuery to a form, connect it to a database, and access TField in some way, e.g. using AsString:
SQL.Clear;
SQL.Add('select top 1 * from aTable');
Open;
for i:=0 to FieldList.Count-1 do
Memo1.Lines.Add(FieldList.Fields[i].AsString);
Close;
Then close the application and an EExternalException will crash the application.
This will prevent me from using XE8 completely. Anyone have a fix?
Bruce
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Bruce
6/5/2015 6:03:32 PM
embarcadero.delphi.ado
597 articles. 
1 followers.
10 Replies
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Note that the place to report bugs is the quality portal at
http://quality.embarcadero.com.
Bruce H wrote:
> XE8 has a very serious bug that was not in XE5 and it's pretty easy to duplicate:
>
> Add a TADOQuery to a form, connect it to a database, and access TField in some way, e.g. using AsString:
>
> SQL.Clear;
> SQL.Add('select top 1 * from aTable');
> Open;
> for i:=0 to FieldList.Count-1 do
> Memo1.Lines.Add(FieldList.Fields[i].AsString);
> Close;
>
> Then close the application and an EExternalException will crash the application.
>
> This will prevent me from using XE8 completely. Anyone have a fix?
>
> Bruce
>
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quinn
6/5/2015 6:08:01 PM
Tried, but my EDN credentials don't work. Had to use the old Quality Central, is report 131888.
> {quote:title=quinn wildman wrote:}{quote}
> Note that the place to report bugs is the quality portal at
> http://quality.embarcadero.com.
>
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Bruce
6/5/2015 11:27:58 PM
Could you please provide additionally: - your table DDL - your SQL Server provide name (or connection string) -- With best regards, Dmitry Arefiev / FireDAC Architect
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Dmitry
6/6/2015 7:41:21 AM
> {quote:title=Dmitry Arefiev wrote:}{quote}
> Could you please provide additionally:
> - your table DDL
> - your SQL Server provide name (or connection string)
>
> --
> With best regards,
> Dmitry Arefiev / FireDAC Architect
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Bruce
6/8/2015 4:09:52 PM
This happens with ADO (not FDConnection nor DBX to SQL Server). Note also that XE5 works fine. I don't have XE6 or XE7.
Connection string: Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=Analytics;Data Source=Server34
A table DDL that throws the error:
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
SET ANSI_PADDING ON
GO
CREATE TABLE [dbo].[Assays](
[Test] [varchar](100) NOT NULL,
[DT_Created] [datetime] NOT NULL CONSTRAINT [DF__Assays__DT_Creat__55F4C372] DEFAULT (getdate()),
[DT_Modified] [datetime] NOT NULL CONSTRAINT [DF__Assays__DT_Modif__56E8E7AB] DEFAULT (getdate()),
[DT_Inactive] [datetime] NULL,
[User_Created] [varchar](10) NOT NULL CONSTRAINT [DF__Assays__User_Cre__57DD0BE4],
[Long_Name] [varchar](255) NULL,
[Description] [varchar](255) NULL,
[Narrative] [varchar](255) NULL,
[Screen] [bit] NOT NULL CONSTRAINT [DF__Assays__Screen__58D1301D] DEFAULT (0),
[Confirmation_Test] [varchar](30) NULL,
[Lead_Time] [varchar](30) NULL,
[Prior_Supv_Review] [bit] NOT NULL CONSTRAINT [DF__Assays__Prior_Su__59C55456] DEFAULT (0),
[Tech_Review_Req] [bit] NOT NULL CONSTRAINT [DF__Assays__Tech_Rev__5AB9788F] DEFAULT (0),
[Admin_Review_Req] [bit] NOT NULL CONSTRAINT [DF__Assays__Admin_Re__5BAD9CC8] DEFAULT (0),
[Analytic_Hours] [float] NULL,
[AutoInc] [int] IDENTITY(1,1) NOT NULL,
[Stamp] [timestamp] NOT NULL,
[Include_In_TAT_Stats] [bit] NOT NULL CONSTRAINT [DF_Assays_Include_In_Stats] DEFAULT (1),
[Max_Number_Scheduled_At_Once] [tinyint] NOT NULL CONSTRAINT [DF_Assays_Max_Number_Scheduled_At_Once] DEFAULT ((1)),
CONSTRAINT [PK__Assays__55009F39] PRIMARY KEY CLUSTERED
(
[Test] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
SET ANSI_PADDING OFF
GO
> {quote:title=Dmitry Arefiev wrote:}{quote}
> Could you please provide additionally:
> - your table DDL
> - your SQL Server provide name (or connection string)
>
> --
> With best regards,
> Dmitry Arefiev / FireDAC Architect
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Bruce
6/8/2015 4:17:10 PM
It may have something to do with the timestamp field. On some of my other tables (they all have timestamps) the error doesn't occur, and it does occur on other tables. I created another table with the same DDL just posted and the error occurs. If I delete the timestamp field the IDE crash does NOT occur anymore.
Note that you have to have data in the table (an empty table will not throw the error), and you must access the <field>.AsString property.
Bruce
> {quote:title=Bruce H wrote:}{quote}
> > {quote:title=Dmitry Arefiev wrote:}{quote}
> > Could you please provide additionally:
> > - your table DDL
> > - your SQL Server provide name (or connection string)
> >
> > --
> > With best regards,
> > Dmitry Arefiev / FireDAC Architect
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Bruce
6/8/2015 4:39:06 PM
Thank you for reporting. This is XE8 regression bug. It is fixed now. If you like to apply patch then do: - download dbbitconv.pas from there https://forums.embarcadero.com/thread.jspa?threadID=115788&tstart=0 - open Data.DB.pas in editor - locate there TDBBitConverter methods implementations - replace them with the dbbitconv.pas content - save Data.DB.pas - add path to Data.DB.pas to your IDE Library Path - recompile and test your application -- With best regards, Dmitry Arefiev / FireDAC Architect
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Dmitry
6/9/2015 6:45:28 PM
now that's great support right there ;)
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Brian
6/10/2015 4:13:34 AM
Agreed! My thanks to Dmitry.
Bruce
> {quote:title=Brian Hamilton Hamilton wrote:}{quote}
> now that's great support right there ;)
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Bruce
6/10/2015 7:45:43 PM
The fix works. I had to copy the Data.ADODB.pas file as well, and both compile as .dcu files with the project, but working now, thanks. Bruce
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Bruce
6/10/2015 10:02:35 PM
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