Shao,
Remember those $$ that start your clause are string escapes.
You can use another form inside your block instead of the quotes
such as
psqlstring := 'UPDATE' || output || $b$SET style_description = CASE WHEN
descriptiveterm ~* 'Polygon Closing Link' THEN 'Polygon Closing
Line' ELSE 'Unclassified' END$b$;
On 4/21/2020 11:34 PM, Shaozhong SHI wrote:
Hi, Giuseppe,
See the following code to see what I am trying to do.
DO $$
DECLARE
wccdate TEXT;
output TEXT := 'public.topographic_line_buckinghamshire_milton_keynes_line';
psqlstring TEXT;
BEGIN
execute format('ALTER TABLE %s ADD style_description varchar(50)', output);
execute format('ALTER TABLE %s ADD style_code int2', output);
psqlstring := 'UPDATE' || output || "SET style_description = CASE WHEN
descriptiveterm ~* 'Polygon Closing Link' THEN 'Polygon Closing Line' ELSE 'Unclassified'
END";
psqlstring := psqlstring || "'," || " " || output || ")'";
execute psqlstring;
END $$;
The other day when I composed a very long string to do something else, it
worked.
Now, I am trying to make update statement and then execute the string. But, I
keep get error message saying the string gets truncated.
Regards,
Shao
On Tue, 21 Apr 2020 at 23:09, Giuseppe Broccolo <[email protected]
<mailto:[email protected]>> wrote:
Hi Shao,
Maybe you are looking about how to pass SQL statements via a shell
here-document:
psql [options] <<EOF
SELECT *
FROM foo1
WHERE col='val';
SELECT * FROM foo2;
EOF
Eventual bash variable within the here-document can be interpolated. To
avoid that just quote the first instance of EOF
psql [options] <<'EOF'
SELECT *
FROM foo1
WHERE col='val';
SELECT * FROM foo2;
EOF
Il giorno mar 21 apr 2020 alle ore 21:16 Shaozhong SHI <[email protected]
<mailto:[email protected]>> ha scritto:
It is quite appealing to wrap up a large block of psql codes as a
string and execute the string.
And, how to deal with quotes within quotes.
I tried short text strings. It worked well, but it does not seem to
work with very long strings in different lines.
Can anyone shed light on this?
Regards,
Shao
_______________________________________________
postgis-users mailing list
[email protected] <mailto:[email protected]>
https://lists.osgeo.org/mailman/listinfo/postgis-users
_______________________________________________
postgis-users mailing list
[email protected] <mailto:[email protected]>
https://lists.osgeo.org/mailman/listinfo/postgis-users
_______________________________________________
postgis-users mailing list
[email protected]
https://lists.osgeo.org/mailman/listinfo/postgis-users
_______________________________________________
postgis-users mailing list
[email protected]
https://lists.osgeo.org/mailman/listinfo/postgis-users
