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cac7658205
This provides a mechanism for specifying conversions between SQL data types and procedural languages. As examples, there are transforms for hstore and ltree for PL/Perl and PL/Python. reviews by Pavel Stěhule and Andres Freund
20 lines
646 B
SQL
20 lines
646 B
SQL
-- make sure the prerequisite libraries are loaded
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DO '1' LANGUAGE plpython3u;
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SELECT NULL::hstore;
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CREATE FUNCTION hstore_to_plpython3(val internal) RETURNS internal
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LANGUAGE C STRICT IMMUTABLE
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AS 'MODULE_PATHNAME', 'hstore_to_plpython';
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CREATE FUNCTION plpython3_to_hstore(val internal) RETURNS hstore
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LANGUAGE C STRICT IMMUTABLE
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AS 'MODULE_PATHNAME', 'plpython_to_hstore';
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CREATE TRANSFORM FOR hstore LANGUAGE plpython3u (
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FROM SQL WITH FUNCTION hstore_to_plpython3(internal),
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TO SQL WITH FUNCTION plpython3_to_hstore(internal)
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);
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COMMENT ON TRANSFORM FOR hstore LANGUAGE plpython3u IS 'transform between hstore and Python dict';
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