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<h3>plpgsql function and COPY</h3> <p>One way would be to put the SQL script into a <a href="http://www.postgresql.org/docs/current/interactive/plpgsql-overview.html#PLPGSQL-ADVANTAGES" rel="nofollow noreferrer">plpgsql function</a>, where you can write the individual return values to files with <a href="http://www.postgresql.org/docs/current/interactive/sql-copy.html" rel="nofollow noreferrer"><code>COPY</code></a> and compile a report from intermediary results just like you need it.</p> <p>This has additional effect that may or may not be desirable. Like, you can grant or revoke permission to the whole function to arbitrary roles. Read about <a href="http://www.postgresql.org/docs/current/interactive/sql-createfunction.html#SQL-CREATEFUNCTION-SECURITY" rel="nofollow noreferrer"><code>SECURITY DEFINER</code></a> in the manual. And the syntax will be verified when you save the function - however, only superficially (there are plans to change that in the future). More details in this <a href="https://dba.stackexchange.com/questions/8119/postgresql-stored-procedure-performance/8189#8189">answer on dba.SE</a>.</p> <p>Basic example:</p> <pre><code>CREATE OR REPLACE FUNCTION func() RETURNS void AS $BODY$ BEGIN COPY (SELECT * FROM tbl WHERE foo) TO '/path/to/my/file/tbl.csv'; COPY (SELECT * FROM tbl2 WHERE NOT bar) TO '/path/to/my/file/tbl2.csv'; END; $BODY$ LANGUAGE plpgsql; </code></pre> <p>Of course, you need to have the necessary privileges in the database and in the file system.<br> Call it from the shell:</p> <pre><code>psql mydb -c 'SELECT func();' </code></pre> <hr> <h3>psql switching between meta commands and SQL</h3> <pre><code>#!/bin/sh BASEDIR='/var/lib/postgresql/outfiles/' echo " \\o $OUTDIR/file1.txt \\\\\\\\ SELECT * FROM tbl1; \\o $OUTDIR/file2.txt \\\\\\\\ SELECT * FROM tbl2; \\o $OUTDIR/file3.txt \\\\\\\\ SELECT * FROM tbl3;" | psql event -p 5432 -t -A </code></pre> <p>That's right, 8 backslashes. Results from a double backslash that gets interpreted two times, so you have to double them two times.</p> <p>I quote <a href="http://www.postgresql.org/docs/current/interactive/app-psql.html" rel="nofollow noreferrer">the manual</a> about the meta-commands <code>\o</code>:</p> <blockquote> <p>Saves future query results to the file filename or ...</p> </blockquote> <p>and <code>\\</code>:</p> <blockquote> <p>command must be either a command string that is completely parsable by the server (i.e., it contains no psql-specific features), or a single backslash command. Thus you cannot mix SQL and psql meta-commands with this option. To achieve that, you could pipe the string into psql, like this: echo '\x \\ SELECT * FROM foo;' | psql. (\\ is the separator meta-command.)</p> </blockquote>
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