133 lines
3.2 KiB
Plaintext
133 lines
3.2 KiB
Plaintext
CREATE EXTENSION plpython2u;
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CREATE EXTENSION hstore_plpython2u;
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-- test hstore -> python
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CREATE FUNCTION test1(val hstore) RETURNS int
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LANGUAGE plpythonu
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TRANSFORM FOR TYPE hstore
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AS $$
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assert isinstance(val, dict)
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plpy.info(sorted(val.items()))
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return len(val)
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$$;
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SELECT test1('aa=>bb, cc=>NULL'::hstore);
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INFO: [('aa', 'bb'), ('cc', None)]
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CONTEXT: PL/Python function "test1"
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test1
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-------
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2
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(1 row)
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-- the same with the versioned language name
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CREATE FUNCTION test1n(val hstore) RETURNS int
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LANGUAGE plpython2u
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TRANSFORM FOR TYPE hstore
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AS $$
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assert isinstance(val, dict)
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plpy.info(sorted(val.items()))
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return len(val)
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$$;
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SELECT test1n('aa=>bb, cc=>NULL'::hstore);
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INFO: [('aa', 'bb'), ('cc', None)]
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CONTEXT: PL/Python function "test1n"
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test1n
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--------
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2
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(1 row)
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-- test hstore[] -> python
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CREATE FUNCTION test1arr(val hstore[]) RETURNS int
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LANGUAGE plpythonu
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TRANSFORM FOR TYPE hstore
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AS $$
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plpy.info(repr(val))
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return len(val)
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$$;
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SELECT test1arr(array['aa=>bb, cc=>NULL'::hstore, 'dd=>ee']);
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INFO: [{'aa': 'bb', 'cc': None}, {'dd': 'ee'}]
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CONTEXT: PL/Python function "test1arr"
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test1arr
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----------
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2
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(1 row)
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-- test python -> hstore
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CREATE FUNCTION test2() RETURNS hstore
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LANGUAGE plpythonu
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TRANSFORM FOR TYPE hstore
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AS $$
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val = {'a': 1, 'b': 'boo', 'c': None}
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return val
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$$;
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SELECT test2();
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test2
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---------------------------------
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"a"=>"1", "b"=>"boo", "c"=>NULL
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(1 row)
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-- test python -> hstore[]
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CREATE FUNCTION test2arr() RETURNS hstore[]
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LANGUAGE plpythonu
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TRANSFORM FOR TYPE hstore
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AS $$
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val = [{'a': 1, 'b': 'boo', 'c': None}, {'d': 2}]
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return val
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$$;
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SELECT test2arr();
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test2arr
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--------------------------------------------------------------
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{"\"a\"=>\"1\", \"b\"=>\"boo\", \"c\"=>NULL","\"d\"=>\"2\""}
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(1 row)
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-- test as part of prepare/execute
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CREATE FUNCTION test3() RETURNS void
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LANGUAGE plpythonu
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TRANSFORM FOR TYPE hstore
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AS $$
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rv = plpy.execute("SELECT 'aa=>bb, cc=>NULL'::hstore AS col1")
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plpy.info(repr(rv[0]["col1"]))
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val = {'a': 1, 'b': 'boo', 'c': None}
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plan = plpy.prepare("SELECT $1::text AS col1", ["hstore"])
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rv = plpy.execute(plan, [val])
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plpy.info(repr(rv[0]["col1"]))
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$$;
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SELECT test3();
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INFO: {'aa': 'bb', 'cc': None}
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CONTEXT: PL/Python function "test3"
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INFO: '"a"=>"1", "b"=>"boo", "c"=>NULL'
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CONTEXT: PL/Python function "test3"
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test3
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-------
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(1 row)
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-- test trigger
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CREATE TABLE test1 (a int, b hstore);
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INSERT INTO test1 VALUES (1, 'aa=>bb, cc=>NULL');
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SELECT * FROM test1;
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a | b
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---+------------------------
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1 | "aa"=>"bb", "cc"=>NULL
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(1 row)
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CREATE FUNCTION test4() RETURNS trigger
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LANGUAGE plpythonu
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TRANSFORM FOR TYPE hstore
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AS $$
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plpy.info("Trigger row: {'a': %r, 'b': %r}" % (TD["new"]["a"], TD["new"]["b"]))
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if TD["new"]["a"] == 1:
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TD["new"]["b"] = {'a': 1, 'b': 'boo', 'c': None}
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return "MODIFY"
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$$;
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CREATE TRIGGER test4 BEFORE UPDATE ON test1 FOR EACH ROW EXECUTE PROCEDURE test4();
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UPDATE test1 SET a = a;
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INFO: Trigger row: {'a': 1, 'b': {'aa': 'bb', 'cc': None}}
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CONTEXT: PL/Python function "test4"
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SELECT * FROM test1;
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a | b
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---+---------------------------------
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1 | "a"=>"1", "b"=>"boo", "c"=>NULL
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(1 row)
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