Generate SQL to update primary key

Question

I want to change a primary key and all table rows which reference to this value.

# table master
master_id|name
===============
foo|bar

# table detail
detail         


        

Answer 1

I found a dirty solution: in psql the command \d master_table show the relevant information. With some text magic, it is possible to extract the needed information:

echo "UPDATE master_table SET id='NEW' WHERE id='OLD';" > tmp/foreign-keys.txt

psql -c '\d master_table' | grep -P 'TABLE.*CONSTRAINT.*FOREIGN KEY'  \
                                 >> tmp/foreign-keys.txt

reprec '.*TABLE ("[^"]*") CONSTRAINT[^(]*\(([^)]*)\).*' \
        "UPDATE \1 set \2='NEW' WHERE \2='OLD';" \
         tmp/foreign-keys.txt 

psql -1 -f tmp/foreign-keys.txt 

Result:

UPDATE "master_table" SET id='NEW' WHERE id='OLD';
UPDATE "other_table" SET master_id='NEW' WHERE master_id='OLD';
...

But better solutions are welcome.