119 lines
2.5 KiB
Plaintext
119 lines
2.5 KiB
Plaintext
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BEGIN;
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/**
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* Samples from PostgreSQL src/tutorial/basics.source
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*/
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CREATE TABLE weather (
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city varchar(80),
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temp_lo int, -- low temperature
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temp_hi int, -- high temperature
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prcp real, -- precipitation
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"date" date
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);
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CREATE TABLE cities (
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name varchar(80),
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location point
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);
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INSERT INTO weather
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VALUES ('San Francisco', 46, 50, 0.25, '1994-11-27');
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INSERT INTO cities
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VALUES ('San Francisco', '(-194.0, 53.0)');
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INSERT INTO weather (city, temp_lo, temp_hi, prcp, "date")
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VALUES ('San Francisco', 43, 57, 0.0, '1994-11-29');
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INSERT INTO weather (date, city, temp_hi, temp_lo)
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VALUES ('1994-11-29', 'Hayward', 54, 37);
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SELECT city, (temp_hi+temp_lo)/2 AS temp_avg, "date" FROM weather;
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SELECT city, temp_lo, temp_hi, prcp, "date", location
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FROM weather, cities
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WHERE city = name;
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/**
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* Dollar quotes starting at the end of the line are colored as SQL unless
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* a special language tag is used. Dollar quote syntax coloring is implemented
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* for Perl, Python, JavaScript, and Json.
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*/
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create or replace function blob_content_chunked(
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in p_data bytea,
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in p_chunk integer)
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returns setof bytea as $$
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-- Still SQL comments
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declare
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v_size integer = octet_length(p_data);
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begin
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for i in 1..v_size by p_chunk loop
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return next substring(p_data from i for p_chunk);
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end loop;
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end;
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$$ language plpgsql stable;
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-- pl/perl
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CREATE FUNCTION perl_max (integer, integer) RETURNS integer AS $perl$
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# perl comment...
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my ($x,$y) = @_;
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if (! defined $x) {
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if (! defined $y) { return undef; }
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return $y;
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}
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if (! defined $y) { return $x; }
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if ($x > $y) { return $x; }
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return $y;
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$perl$ LANGUAGE plperl;
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-- pl/python
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CREATE FUNCTION usesavedplan() RETURNS trigger AS $python$
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# python comment...
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if SD.has_key("plan"):
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plan = SD["plan"]
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else:
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plan = plpy.prepare("SELECT 1")
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SD["plan"] = plan
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$python$ LANGUAGE plpythonu;
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-- pl/v8 (javascript)
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CREATE FUNCTION plv8_test(keys text[], vals text[]) RETURNS text AS $javascript$
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var o = {};
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for(var i=0; i<keys.length; i++){
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o[keys[i]] = vals[i];
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}
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return JSON.stringify(o);
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$javascript$ LANGUAGE plv8 IMMUTABLE STRICT;
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-- json
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select * from json_object_keys($json$
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{
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"f1": 5,
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"f2": "test",
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"f3": {}
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}
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$json$);
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-- psql commands
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\df cash*
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-- Some string samples.
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select 'don''t do it now;' || 'maybe later';
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select E'dont\'t do it';
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select length('some other''s stuff' || $$cat in hat's stuff $$);
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select $$ strings
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over multiple
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lines - use dollar quotes
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$$;
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END;
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