[v14] PKs in New Tables - Bug or feature??

Keisuke Miyako (3/23/14 7:44AM)
Keisuke Miyako (3/23/14 1:46PM)
J?rg Knebel (3/23/14 3:17PM)
J?rg Knebel (3/23/14 9:14PM)
Joshua Fletcher (3/25/14 6:03PM)
Chuck Miller (3/26/14 12:31PM)
J?rg Knebel (3/26/14 3:30PM)
Joshua Fletcher (3/27/14 6:09PM)
David Adams (3/28/14 12:06PM)

Keisuke Miyako (3/23/14 7:44 AM)

Hello,

it (type and name) depends on your preferences/structure settings.

miyako

On 2014/03/23 13:17, "J?=83¬=B6rg Knebel"
<jknebel@...
wrote:

color><param>00000,0000,DDEE/param>DDid someone else tried to change
the type of that automatically created
PK-field to type-UUID directly?
/color>
Keisuke Miyako (3/23/14 1:46 PM)

something like:

1. uncheck database settings/integrate latest log if data file is
incomplete.
2. select table, right click, delete primary key.
3. select field, change type to string/UUID/auto.
4. goto MSC/compress/advanced/force update records.
5. restart. select ?=A2?=82¨=C5&igrave;create new log file?=A2?=82¨
¬=9D when prompted.
6. create primary key.
7. check database settings/integrate latest log if data file is
incomplete.

what I find perplexing is that if I use ?=A2?=82¨=C5&igrave;update by
formula (Generate
UUID)?=A2?=82¨=C2&ugrave; in step 4.
I can?=A2?=82¨=E2&Ntilde;¢t later set the field as primary key
(duplicate error)

miyako

On 2014/03/23 19:14, "J?=83¬=B6rg Knebel"
<jknebel@...
wrote:

color><param>00000,0000,DDEE/param>TThe question was: "How do I change
it after the field was created?" :o)
/color>
J?rg Knebel (3/23/14 3:17 PM)

Hi,

Is it just me or is there someone who can confirm this.

Environment: Mac X.8.5, 4D 14.1

Adding a new Table in a v14 database creates the table with a ID-field
of type LongInt Primary Key.

According to that webinar

<<https://www.youtube.com/watch?v=cquRjXBl1xE&list=UUGInXMk9DNWgkB3mJO
96Wrw>
a PK can be of type LongInt or UUID and a PK is mandatory for every
table.

Did someone else tried to change the type of that automatically
created PK-field to type-UUID directly?

Have fun! :o))))

Regards
J?=B6rg Knebel, M.Eng. - 4D Developer since 1991
TTT Data Systems Pty Ltd
Phone: +61 (0)2 6334 4730
www.tttdatasystems.com.au
J?rg Knebel (3/23/14 9:14 PM)

On 23/03/2014, at 17:44 AEDT, Keisuke Miyako <Keisuke.Miyako@...
wrote:

color><param>00000,0000,DDEE/param>iit (type and name) depends on your
preferences/structure settings.
/color>
Thanks Miyako, but I knew that.

The question was: "How do I change it after the field was created?" :o)

Regards
J?=B6rg Knebel, M.Eng. - 4D Developer since 1991
TTT Data Systems Pty Ltd
Phone: +61 (0)2 6334 4730
www.tttdatasystems.com.au
Joshua Fletcher (3/25/14 6:03 PM)

For a brand new table with no data?

-select table, right-click, delete primary key.
-select field, change type to string/UUID/auto.
-select field, right-click, create primary key.
-enable "include in log" file for the table (first step will disable
it).

Note: PK's are not *required*. You can have a table without a PK, but
you
therefore cannot journal it.

The explanation that Miyako posted applies to tables with existing data
IMO; the risk is certainly higher there.

-Josh

--
Josh Fletcher
Technical Account Manager
4D, Inc.

On 3/23/14, 3:14 AM, "J^rg Knebel" <jknebel@...
wrote:

color><param>00000,0000,DDEE/param>TThe question was: "How do I change
it after the field was created?" :o)
/color>
Chuck Miller (3/26/14 12:31 PM)

Wait a minute taken out of context that means that there are no
journal entries for these records. I get that you can not use journal
to recover version of db

If what you are saying is true, I do not recall ever seeing this in
any dbs journaling

Regards
Chuck
On Mar 26, 2014, at 12:30 AM, J^rg Knebel wrote:

color><param>8826F,0000,8219/param>NNote: PK's are not *required*. You
can have a table without a PK, but you
therefore cannot journal it.
/color>

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J?rg Knebel (3/26/14 3:30 PM)

Josh,

Thanks for responding.

On 26/03/2014, at 04:03 AEDT, Joshua Fletcher <JFletcher@...
wrote:

color><param>00000,0000,DDEE/param>NNote: PK's are not *required*. You
can have a table without a PK, but you
therefore cannot journal it.
/color>
Just what I want thanks - I'll whinge again if it doesn't work as
expected of course.

Regards
J?=B6rg Knebel, M.Eng. - 4D Developer since 1991
TTT Data Systems Pty Ltd
Phone: +61 (0)2 6334 4730
www.tttdatasystems.com.au
Joshua Fletcher (3/27/14 6:09 PM)

Yes, that's also true because it's not possible to enable journaling
for a table unless it has a primary key.

I.e. a primary key is required for journaling in 4D v14.

-Josh

--
Josh Fletcher
Technical Account Manager
4D, Inc

color><param>00000,0000,DDEE/param>
/color>

-----Original Message-----
color><param>00000,0000,DDEE/param>II thought what you were stating
was that tables
with no primary key were not added to journal.
/color>
David Adams (3/28/14 12:06 PM)

<CAPXPcQtZ6OXW4pPBcSg54ZcH6rNxBC8RTEWM+34sRffaC160cg@...

color><param>00000,0000,DDEE/param>TThis setting toggles the ability
to access the table from Wakanda as a
/color>ddataclass.

I haven't looked at this at all, but if it's going over HTTP then
you're
exposing the table to anything that sends in a message formatted like a
request from Wakanda, I'd assume. Sounds like I should download the
Webcast
next week! (I still have to review the journaling one.) It's great
that you
guys are preparing these presentations and putting them on YouTube for
review.

<anecdote>
I like to download them as playback at 1:1 speed is pretty hard to stay
attentive to. Back in the 70's, my mom worked at a company called
Lexicon
that made digital-effects gear for studio racks. They sold one box
that did
nothing but pitch-shift recordings. So, you could take a 1x recording
and
play it back at say .5 speed or 1.5 speed without it sounding either
waaaaaay-toooo-slow or like a chipmunk. They tried out letting people
play
back recordings of speech and gave them a dial with no label. People
picked
about 1.25-1.5 as "normal", if I remember right. (I tired it too and
that's
how it worked out.) Listening to recordings just isn't stimulating
enough
to keep you engaged the way a real-life presentation might be. So, you
can
listen more attentively and absorb more if you can speed up playback.
I use
VLC at about 1.25x and it works just fine. Someone that speaks English
as a
second (third, etc.) language might want to slow the recording down,
for
all I know. If you use the (wonderful) VLC, look at the "Playback"
menu for
the speed slider.
</anecdote>
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