I don't know how many different ways I can say it, but I'll try again: *there
is no difference between a V3.9 database and a V4.0 database!*

Just keep using your old database. Copy it over into your new installation
and restart weewx. Done.

-tk

On Mon, May 18, 2020 at 5:24 AM Ron Sell <[email protected]> wrote:

> I upgraded to Pi4,
> when I started installing everything I just went with the latest version.
> I guess i could uninstall weewx4 and go with 3.9.
>
> On Mon, May 18, 2020 at 8:17 AM Tom Keffer <[email protected]> wrote:
>
>> Yeah, I guess that strategy won't work, at least not with a
>> simple ".dump" command.
>>
>> Can we pause for a second and ask why you are doing this? What was wrong
>> with your old database?
>>
>> On Sun, May 17, 2020 at 7:01 PM Ron Sell <[email protected]> wrote:
>>
>>> Thanks.
>>>
>>> Got the script working but now i get this\:
>>> Error: near line 38817: table archive has 114 columns but 59 values were
>>> supplied
>>>
>>> do i need to modify the .sql to provide the difference in values?
>>>
>>>
>>> On Sun, May 17, 2020 at 8:47 PM Tom Keffer <[email protected]> wrote:
>>>
>>>> It's in the commands I suggested. Make a backup first.
>>>>
>>>> On Sun, May 17, 2020 at 5:41 PM Ron Sell <[email protected]> wrote:
>>>>
>>>>> Thanks,
>>>>> I did the data dump. Its now an SQL file. How do I get it into the
>>>>> weewx4.0 database?
>>>>>
>>>>> thanks
>>>>>
>>>>>
>>>>> On Sun, May 17, 2020 at 11:06 AM Tom Keffer <[email protected]> wrote:
>>>>>
>>>>>> How about doing a dump of the v3.9 database, then delete the CREATE
>>>>>> TABLE statement. Then import into the V4 database.
>>>>>>
>>>>>> Something like:
>>>>>>
>>>>>> # Create a dump, then strip out the CREATE TABLE
>>>>>> echo ".dump" | sqlite3 weewx3.92.sdb | sed -e 's/^CREATE TABLE//' >
>>>>>> weewx3.92.sql
>>>>>> # Use the results to insert into the V4.0 table
>>>>>> sqlite3 weewx4.0.sdb < weewx3.92.sql
>>>>>>
>>>>>> One thing I want to stress is that there is no difference between a
>>>>>> V3.9 database and a V4.0 database. The only difference is that V4.0 
>>>>>> offers
>>>>>> a new, extended schema.
>>>>>>
>>>>>> -tk
>>>>>>
>>>>>> On Sun, May 17, 2020 at 6:55 AM Ron Sell <[email protected]> wrote:
>>>>>>
>>>>>>> I upgraded to a new Pi and weewx 4.0.
>>>>>>>
>>>>>>> Old Pi
>>>>>>> weexwx 3.9.2
>>>>>>> Database extended for more observations
>>>>>>> 58 columns
>>>>>>> Running for a year
>>>>>>>
>>>>>>> New Pi
>>>>>>> Weewx 4.0
>>>>>>> Database not extended Included all of the observstions i needed in
>>>>>>> the new version.'
>>>>>>> 113 columns
>>>>>>>
>>>>>>> What is the best way to keep all my old data?
>>>>>>>
>>>>>>>
>>>>>>> I can't just copy the old database 1 for 1 since they are different.
>>>>>>>
>>>>>>> thanks
>>>>>>>
>>>>>>>
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