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POPostgresQL Stored Procs: Using a set of results in an update statement without looping through the set
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2012-06-19T17:47:31.707
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2012-06-21T18:38:39.770
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I have a stored procedure in which I need to query for a set of <code>ids</code> and then use that set in an <code>UPDATE</code> statement's <code>WHERE</code> clause. I'm using PostgresQL 9.0+. I'd rather not use a loop over the set of <code>ids</code> and issue multiple <code>UPDATE</code> statements -- that's not very efficient. Here's a simple example: <pre><code>CREATE OR REPLACE FUNCTION test_it() RETURNS VOID AS $$ DECLARE cur_time TIMESTAMP; ids a%ROWTYPE; BEGIN SELECT id FROM a INTO ids; UPDATE b SET state = 'foobar', updated_at = cur_time WHERE id IN ids; END; $$ LANGUAGE plpgsql; </code></pre> This doesn't even compile. I've also tried SELECT-ing the <code>ids</code> like so... <pre><code>CREATE OR REPLACE FUNCTION test_it() RETURNS VOID AS $$ DECLARE cur_time TIMESTAMP; ids a%ROWTYPE; BEGIN SELECT id FROM a INTO ids; UPDATE b SET state = 'foobar', updated_at = cur_time WHERE id IN (SELECT ids); END; $$ LANGUAGE plpgsql; </code></pre> This throws an error: HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts. My actual stored proc is a lot more complicated because the initial query for the set of <code>ids</code> is actually a dynamic query. The actual error output is this (just more context...): <pre><code>ERROR: operator does not exist: integer = task_responses LINE 3: WHERE id IN (SELECT task_response_ids) ^ HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts. QUERY: UPDATE task_responses SET state = state, updated_at = cur_time, rejected_at = cur_time WHERE id IN (SELECT task_response_ids) CONTEXT: PL/pgSQL function "reject_submissions_with_comment" line 38 at SQL statement </code></pre>
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<postgresql><stored-procedures><local-variables>
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PostgresQL Stored Procs: Using a set of results in an update statement without looping through the set
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