From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Wells Oliver <wells(dot)oliver(at)gmail(dot)com> |
Cc: | pgsql-admin <pgsql-admin(at)postgresql(dot)org> |
Subject: | Re: plpgsql, dynamic variable lengths.. |
Date: | 2020-02-08 02:09:44 |
Message-ID: | 29969.1581127784@sss.pgh.pa.us |
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Wells Oliver <wells(dot)oliver(at)gmail(dot)com> writes:
> I am trying to create a plpgsql function which accepts a jsonb object as
> its parameter.
> This jsonb can have up to three keys, and I am trying to build out the
> dynamic SQL like this. I want to be able to pass a variable number of
> params to the RETURN QUERY EXECUTE ... USING ... because it can be 0 params
> in the JSONB object, or one, or two.
> What's the missing piece here? How can I adjust my USING to accomplish this?
I think your USING is probably fine. But you made all the SQL fragments
refer to $1:
> begin
> SQLSTRING := 'SELECT * FROM mytable WHERE true';
> if args->>'col1' is not null then
> SQLSTRING := SQLSTRING || ' AND col1 = $1';
> end if;
> if args->>'col2' is not null then
> SQLSTRING := SQLSTRING || ' AND col2 = $1';
> end if;
> if args->>'col3' is not null then
> SQLSTRING := SQLSTRING || ' AND col3 = $1';
> end if;
Of course those need to be $1, $2, $3.
regards, tom lane
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