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POCalling a stored procedure within a stored procedure
 

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    <p>I am trying to call a function within a function using sql on postgres 9.3.</p> <p>This question is related to <a href="http://bit.ly/1hB2Hn3" rel="nofollow">another post by me</a>.</p> <p>I have written the below function. So far I have failed to incorporate any kind of save-output (COPY) statement, so I am trying to work around this by creating a nested function print-out function. </p> <pre><code>CREATE FUNCTION retrieve_info(TEXT, TEXT) RETURNS SETOF retrieve_info_tbl AS $$ SELECT tblA.id, tblA.method, tblA.species, tblA.location FROM tblA WHERE method=$1 AND species=$2 GROUP BY id, method, species ORDER BY location $$ LANGUAGE 'sql'; </code></pre> <p>The above function works.</p> <p>An attempt to create a nested function.</p> <pre><code>CREATE FUNCTION print_out(TEXT, TEXT) RETURNS void AS $$ COPY (SELECT * FROM retrieve_info($1, $2)) TO 'myfilepath/test.csv' WITH CSV HEADER; $$ LANGUAGE 'sql'; </code></pre> <p>Calling nested function.</p> <pre><code>SELECT * FROM print_out('mtd1','sp1'); </code></pre> <p><strong>OUTPUT</strong></p> <p>The above gives this <code>ERROR: column "$1" does not exist SQL state: 42P02 Context: SQL function "print_out" statement 1</code>. However, when substituting the arg1, arg2 in print_out() with 'mtd1','sp1' the correct output is printed to test.csv (as seen below)</p> <pre><code>id | method | ind | location ---------------------------- 1a | mtd1 | sp3 | locA 1d | mtd1 | sp3 | locB </code></pre> <p>How would I get the arg1, arg2 of retrieve_info() to call arg1, arg2 properly within print_out()?</p> <p>I am completely stuck. Would appreciate any pointers, thanks</p>
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    1. COClosely related: http://stackoverflow.com/questions/16019508/copy-with-dynamic-file-name/16021835#16021835 and http://stackoverflow.com/questions/16991383/postgres-copy-from-variable-with-csv-data/16991854#16991854
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