Ah. We'd truncate all of the dev tables, then load a "slice" (for example,
accounts 10000 to 19999, and all associated records from downstream tables;
lots and lots of views!!) from the prod database.
On 10/4/23 20:50, Dow Drake wrote:
Thanks for the reply, Ron!
I'm not sure I see how to make your suggestion work, though. Suppose I
dump the three tables to CSV as you suggest (and write a script to extract
the relevant records from those CSV dumps in the correct order). It might
be that in the dev database, the next generated key values are 199 for
farm's id, 2145 for crop's id and 10242 for deliveries' id. The databases
are independent.
Just inserting the records in the same order doesn't take care of setting
the foreign key values correctly -- does it? I think I'm really looking
for a solution more along the lines of the link in my original post.
Best,
Dow
On Wed, Oct 4, 2023 at 6:26 PM Ron <ronljohnso...@gmail.com> wrote:
Frame challenge: why can't you just "\copy to" the dev database tables
in the correct order, to satisfy foreign key requirements?
On 10/4/23 18:59, Dow Drake wrote:
Hi,
I'm trying to write a postgresql script to replicate a hierarchical
structure in a live database into my development database, where I
can debug and test more easily. I can extract the data from the live
database that needs to be inserted, but I'm having trouble writing
the insertion script
Here's a simplified version of the problem I'm trying to solve:
There are three tables: farms, crops and deliveries where a farm has
many crops and a crop has many deliveries.
create table farms (
id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY,
name character varying(30)
);
create table crops (
id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY,
farm_id bigint not null
name character varying(30)
);
create table deliveries (
id bigint NOT NULL GENERATED BY DEFAULT AS IDENTITY,
crop_id bigint not null
ticket character varying(30)
);
I want to insert a farm record, then insert two crops associated with
that farm, then insert two deliveries for each of the the two crops
so that in the end, my tables look like this:
farms
id name
1 'Happy Valley Farm'
crops
id farm_id name
1 1 'corn'
2 1 'wheat'
delvieries
id crop_id ticket
1 1 '3124'
2 2 '3127'
3 1 '3133'
4 2 '3140'
It's important that the deliveries get assigned to the right crops.
I think this post: https://dba.stackexchange.com/questions/199916
gets close to what I need, but I haven't been able to figure out how
to adapt it to multiple records.
Thanks for any help on this!
--
Born in Arizona, moved to Babylonia.
--
Born in Arizona, moved to Babylonia.
