Created
January 30, 2011 23:47
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query_to_json.sql
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create or replace function xml2json (xml) returns text | |
language plperlu as | |
$func$ | |
use XML::XML2JSON; | |
use strict; | |
my $xml = shift; | |
my $XML2JSON = XML::XML2JSON->new(pretty => 0); # 1 for readable json | |
# work around horrid XML2JSON bug with elements consisting for <foo>0/foo> | |
$xml =~ s!<([^>]+)>0</\1>!<$1>9999999999999999</$1>!g; | |
# work around another horrid bug, which turns a string of all blanks into {} | |
$xml =~ s!<([^>]+)>(\s*)</\1>!<$1>$2,Mxy;zptlk~</$1>!g; | |
my $json = $XML2JSON->convert($xml); | |
$json =~ s/9999999999999999/0/g; | |
$json =~ s/,Mxy;zptlk~//g; | |
# flatten the structure | |
# nulls: | |
$json =~ s/\{[^"]*"\@xsi:nil" ?: ?"true"[^"}]*}(,?)/null$1/gs; | |
# numbers (not in scientific notation): | |
# don't dequote a number with a leading zero if it's followed by | |
# another digit - e.g. a zip code | |
$json =~ s/{[^"]*"\$t" ?: ?"(-?(0|([1-9]\d*))(\.\d+)?)"[^"}]*}(,?)/$1$5/gs; | |
# booleans: | |
$json =~ s/{[^"]*"\$t" ?: ?"(true|false)"[^"}]*}(,?)/$1$2/gs; | |
# strings: | |
# arrays and composites are not decomposed, they just come in | |
# as strings | |
$json =~ s/{[^"]*"\$t" ?: ?"(([^"]|\\")*)"[^"}]*}(,?)/"$1"$3/gs; | |
#remove wrapper | |
# single row - make it an array of one | |
$json =~ s/^.*?"row"\s*:\s*\{/\[\{/; | |
$json =~ s/\}\s*}\s*}\s*$/\}\]/; | |
# array of rows | |
$json =~ s/^.*?"row"\s*:\s*\[/\[/; | |
$json =~ s/\]\s*}\s*}\s*$/\]/; | |
return $json; | |
$func$; | |
create or replace function query_to_json(query text) returns text | |
language sql as | |
$func$ | |
select xml2json(query_to_xml($1,true,false,'')) | |
$func$; |
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