ERROR: invalid input syntax for type json
LINE 1: SELECT $$''$$::json;
^
-DETAIL: line 1: Token "'" is invalid.
+DETAIL: Token "'" is invalid.
+CONTEXT: JSON data, line 1: '...
SELECT '"abc"'::json; -- OK
json
-------
ERROR: invalid input syntax for type json
LINE 1: SELECT '"abc'::json;
^
-DETAIL: line 1: Token ""abc" is invalid.
+DETAIL: Token ""abc" is invalid.
+CONTEXT: JSON data, line 1: "abc
SELECT '"abc
def"'::json; -- ERROR, unescaped newline in string constant
ERROR: invalid input syntax for type json
LINE 1: SELECT '"abc
^
-DETAIL: line 1: Character "
-" must be escaped.
+DETAIL: Character with value 0x0a must be escaped.
+CONTEXT: JSON data, line 1: "abc
SELECT '"\n\"\\"'::json; -- OK, legal escapes
json
----------
ERROR: invalid input syntax for type json
LINE 1: SELECT '"\v"'::json;
^
-DETAIL: line 1: Invalid escape "\v".
+DETAIL: Escape sequence "\v" is invalid.
+CONTEXT: JSON data, line 1: "\v...
SELECT '"\u"'::json; -- ERROR, incomplete escape
ERROR: invalid input syntax for type json
LINE 1: SELECT '"\u"'::json;
^
-DETAIL: line 1: "\u" must be followed by four hexadecimal digits.
+DETAIL: "\u" must be followed by four hexadecimal digits.
+CONTEXT: JSON data, line 1: "\u"
SELECT '"\u00"'::json; -- ERROR, incomplete escape
ERROR: invalid input syntax for type json
LINE 1: SELECT '"\u00"'::json;
^
-DETAIL: line 1: "\u" must be followed by four hexadecimal digits.
+DETAIL: "\u" must be followed by four hexadecimal digits.
+CONTEXT: JSON data, line 1: "\u00"
SELECT '"\u000g"'::json; -- ERROR, g is not a hex digit
ERROR: invalid input syntax for type json
LINE 1: SELECT '"\u000g"'::json;
^
-DETAIL: line 1: "\u" must be followed by four hexadecimal digits.
+DETAIL: "\u" must be followed by four hexadecimal digits.
+CONTEXT: JSON data, line 1: "\u000g...
SELECT '"\u0000"'::json; -- OK, legal escape
json
----------
ERROR: invalid input syntax for type json
LINE 1: SELECT '01'::json;
^
-DETAIL: line 1: Token "01" is invalid.
+DETAIL: Token "01" is invalid.
+CONTEXT: JSON data, line 1: 01
SELECT '0.1'::json; -- OK
json
------
ERROR: invalid input syntax for type json
LINE 1: SELECT '1f2'::json;
^
-DETAIL: line 1: Token "1f2" is invalid.
+DETAIL: Token "1f2" is invalid.
+CONTEXT: JSON data, line 1: 1f2
+SELECT '0.x1'::json; -- ERROR
+ERROR: invalid input syntax for type json
+LINE 1: SELECT '0.x1'::json;
+ ^
+DETAIL: Token "0.x1" is invalid.
+CONTEXT: JSON data, line 1: 0.x1
+SELECT '1.3ex100'::json; -- ERROR
+ERROR: invalid input syntax for type json
+LINE 1: SELECT '1.3ex100'::json;
+ ^
+DETAIL: Token "1.3ex100" is invalid.
+CONTEXT: JSON data, line 1: 1.3ex100
-- Arrays.
SELECT '[]'::json; -- OK
json
(1 row)
SELECT '[1,2,]'::json; -- ERROR, trailing comma
-ERROR: invalid input syntax for type json: "[1,2,]"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '[1,2,]'::json;
^
-DETAIL: line 1: Expected string, number, object, array, true, false, or null, but found "]".
+DETAIL: Expected JSON value, but found "]".
+CONTEXT: JSON data, line 1: [1,2,]
SELECT '[1,2'::json; -- ERROR, no closing bracket
-ERROR: invalid input syntax for type json: "[1,2"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '[1,2'::json;
^
DETAIL: The input string ended unexpectedly.
+CONTEXT: JSON data, line 1: [1,2
SELECT '[1,[2]'::json; -- ERROR, no closing bracket
-ERROR: invalid input syntax for type json: "[1,[2]"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '[1,[2]'::json;
^
DETAIL: The input string ended unexpectedly.
+CONTEXT: JSON data, line 1: [1,[2]
-- Objects.
SELECT '{}'::json; -- OK
json
(1 row)
SELECT '{"abc"}'::json; -- ERROR, no value
-ERROR: invalid input syntax for type json: "{"abc"}"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '{"abc"}'::json;
^
-DETAIL: line 1: Expected ":", but found "}".
+DETAIL: Expected ":", but found "}".
+CONTEXT: JSON data, line 1: {"abc"}
SELECT '{"abc":1}'::json; -- OK
json
-----------
(1 row)
SELECT '{1:"abc"}'::json; -- ERROR, keys must be strings
-ERROR: invalid input syntax for type json: "{1:"abc"}"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '{1:"abc"}'::json;
^
-DETAIL: line 1: Expected string or "}", but found "1".
+DETAIL: Expected string or "}", but found "1".
+CONTEXT: JSON data, line 1: {1...
SELECT '{"abc",1}'::json; -- ERROR, wrong separator
-ERROR: invalid input syntax for type json: "{"abc",1}"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '{"abc",1}'::json;
^
-DETAIL: line 1: Expected ":", but found ",".
+DETAIL: Expected ":", but found ",".
+CONTEXT: JSON data, line 1: {"abc",...
SELECT '{"abc"=1}'::json; -- ERROR, totally wrong separator
ERROR: invalid input syntax for type json
LINE 1: SELECT '{"abc"=1}'::json;
^
-DETAIL: line 1: Token "=" is invalid.
+DETAIL: Token "=" is invalid.
+CONTEXT: JSON data, line 1: {"abc"=...
SELECT '{"abc"::1}'::json; -- ERROR, another wrong separator
-ERROR: invalid input syntax for type json: "{"abc"::1}"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '{"abc"::1}'::json;
^
-DETAIL: line 1: Expected string, number, object, array, true, false, or null, but found ":".
+DETAIL: Expected JSON value, but found ":".
+CONTEXT: JSON data, line 1: {"abc"::...
SELECT '{"abc":1,"def":2,"ghi":[3,4],"hij":{"klm":5,"nop":[6]}}'::json; -- OK
json
---------------------------------------------------------
(1 row)
SELECT '{"abc":1:2}'::json; -- ERROR, colon in wrong spot
-ERROR: invalid input syntax for type json: "{"abc":1:2}"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '{"abc":1:2}'::json;
^
-DETAIL: line 1: Expected "," or "}", but found ":".
+DETAIL: Expected "," or "}", but found ":".
+CONTEXT: JSON data, line 1: {"abc":1:...
SELECT '{"abc":1,3}'::json; -- ERROR, no value
-ERROR: invalid input syntax for type json: "{"abc":1,3}"
+ERROR: invalid input syntax for type json
LINE 1: SELECT '{"abc":1,3}'::json;
^
-DETAIL: line 1: Expected string, but found "3".
+DETAIL: Expected string, but found "3".
+CONTEXT: JSON data, line 1: {"abc":1,3...
+-- Recursion.
+SET max_stack_depth = '100kB';
+SELECT repeat('[', 10000)::json;
+ERROR: stack depth limit exceeded
+HINT: Increase the configuration parameter "max_stack_depth" (currently 100kB), after ensuring the platform's stack depth limit is adequate.
+SELECT repeat('{"a":', 10000)::json;
+ERROR: stack depth limit exceeded
+HINT: Increase the configuration parameter "max_stack_depth" (currently 100kB), after ensuring the platform's stack depth limit is adequate.
+RESET max_stack_depth;
-- Miscellaneous stuff.
SELECT 'true'::json; -- OK
json
(1 row)
SELECT 'true false'::json; -- ERROR, too many values
-ERROR: invalid input syntax for type json: "true false"
+ERROR: invalid input syntax for type json
LINE 1: SELECT 'true false'::json;
^
-DETAIL: line 1: Expected end of input, but found "false".
+DETAIL: Expected end of input, but found "false".
+CONTEXT: JSON data, line 1: true false
SELECT 'true, false'::json; -- ERROR, too many values
-ERROR: invalid input syntax for type json: "true, false"
+ERROR: invalid input syntax for type json
LINE 1: SELECT 'true, false'::json;
^
-DETAIL: line 1: Expected end of input, but found ",".
+DETAIL: Expected end of input, but found ",".
+CONTEXT: JSON data, line 1: true,...
SELECT 'truf'::json; -- ERROR, not a keyword
ERROR: invalid input syntax for type json
LINE 1: SELECT 'truf'::json;
^
-DETAIL: line 1: Token "truf" is invalid.
+DETAIL: Token "truf" is invalid.
+CONTEXT: JSON data, line 1: truf
SELECT 'trues'::json; -- ERROR, not a keyword
ERROR: invalid input syntax for type json
LINE 1: SELECT 'trues'::json;
^
-DETAIL: line 1: Token "trues" is invalid.
+DETAIL: Token "trues" is invalid.
+CONTEXT: JSON data, line 1: trues
SELECT ''::json; -- ERROR, no value
-ERROR: invalid input syntax for type json: ""
+ERROR: invalid input syntax for type json
LINE 1: SELECT ''::json;
^
DETAIL: The input string ended unexpectedly.
+CONTEXT: JSON data, line 1:
SELECT ' '::json; -- ERROR, no value
-ERROR: invalid input syntax for type json: " "
+ERROR: invalid input syntax for type json
LINE 1: SELECT ' '::json;
^
DETAIL: The input string ended unexpectedly.
+CONTEXT: JSON data, line 1:
--constructors
-- array_to_json
SELECT array_to_json(array(select 1 as a));
(1 row)
SELECT array_to_json(array_agg(q),false) from (select x as b, x * 2 as c from generate_series(1,3) x) q;
- array_to_json
----------------------------------------------------
- [{"f1":1,"f2":2},{"f1":2,"f2":4},{"f1":3,"f2":6}]
+ array_to_json
+---------------------------------------------
+ [{"b":1,"c":2},{"b":2,"c":4},{"b":3,"c":6}]
(1 row)
SELECT array_to_json(array_agg(q),true) from (select x as b, x * 2 as c from generate_series(1,3) x) q;
- array_to_json
--------------------
- [{"f1":1,"f2":2},+
- {"f1":2,"f2":4},+
- {"f1":3,"f2":6}]
+ array_to_json
+-----------------
+ [{"b":1,"c":2},+
+ {"b":2,"c":4},+
+ {"b":3,"c":6}]
(1 row)
SELECT array_to_json(array_agg(q),false)
- FROM ( SELECT $$a$$ || x AS b, y AS c,
+ FROM ( SELECT $$a$$ || x AS b, y AS c,
ARRAY[ROW(x.*,ARRAY[1,2,3]),
- ROW(y.*,ARRAY[4,5,6])] AS z
- FROM generate_series(1,2) x,
+ ROW(y.*,ARRAY[4,5,6])] AS z
+ FROM generate_series(1,2) x,
generate_series(4,5) y) q;
- array_to_json
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
- [{"f1":"a1","f2":4,"f3":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},{"f1":"a1","f2":5,"f3":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]},{"f1":"a2","f2":4,"f3":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},{"f1":"a2","f2":5,"f3":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}]
+ array_to_json
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+ [{"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},{"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]},{"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]},{"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}]
(1 row)
SELECT array_to_json(array_agg(x),false) from generate_series(5,10) x;
{"f1":1,"f2":"foo"}
(1 row)
-SELECT row_to_json(q)
-FROM (SELECT $$a$$ || x AS b,
- y AS c,
+SELECT row_to_json(q)
+FROM (SELECT $$a$$ || x AS b,
+ y AS c,
ARRAY[ROW(x.*,ARRAY[1,2,3]),
- ROW(y.*,ARRAY[4,5,6])] AS z
- FROM generate_series(1,2) x,
+ ROW(y.*,ARRAY[4,5,6])] AS z
+ FROM generate_series(1,2) x,
generate_series(4,5) y) q;
- row_to_json
------------------------------------------------------------------------
- {"f1":"a1","f2":4,"f3":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
- {"f1":"a1","f2":5,"f3":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
- {"f1":"a2","f2":4,"f3":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
- {"f1":"a2","f2":5,"f3":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
+ row_to_json
+--------------------------------------------------------------------
+ {"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
+ {"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
+ {"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
+ {"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
(4 rows)
-SELECT row_to_json(q,true)
-FROM (SELECT $$a$$ || x AS b,
- y AS c,
+SELECT row_to_json(q,true)
+FROM (SELECT $$a$$ || x AS b,
+ y AS c,
ARRAY[ROW(x.*,ARRAY[1,2,3]),
- ROW(y.*,ARRAY[4,5,6])] AS z
- FROM generate_series(1,2) x,
+ ROW(y.*,ARRAY[4,5,6])] AS z
+ FROM generate_series(1,2) x,
generate_series(4,5) y) q;
- row_to_json
-------------------------------------------------------
- {"f1":"a1", +
- "f2":4, +
- "f3":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
- {"f1":"a1", +
- "f2":5, +
- "f3":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
- {"f1":"a2", +
- "f2":4, +
- "f3":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
- {"f1":"a2", +
- "f2":5, +
- "f3":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
+ row_to_json
+-----------------------------------------------------
+ {"b":"a1", +
+ "c":4, +
+ "z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
+ {"b":"a1", +
+ "c":5, +
+ "z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
+ {"b":"a2", +
+ "c":4, +
+ "z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
+ {"b":"a2", +
+ "c":5, +
+ "z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
(4 rows)
CREATE TEMP TABLE rows AS
SELECT x, 'txt' || x as y
FROM generate_series(1,3) AS x;
-SELECT row_to_json(q,true)
+SELECT row_to_json(q,true)
FROM rows q;
row_to_json
--------------
{"f1":[5,6,7,8,9,10]}
(1 row)
+-- to_json, timestamps
+select to_json(timestamp '2014-05-28 12:22:35.614298');
+ to_json
+------------------------------
+ "2014-05-28T12:22:35.614298"
+(1 row)
+
+BEGIN;
+SET LOCAL TIME ZONE 10.5;
+select to_json(timestamptz '2014-05-28 12:22:35.614298-04');
+ to_json
+------------------------------------
+ "2014-05-29T02:52:35.614298+10:30"
+(1 row)
+
+SET LOCAL TIME ZONE -8;
+select to_json(timestamptz '2014-05-28 12:22:35.614298-04');
+ to_json
+------------------------------------
+ "2014-05-28T08:22:35.614298-08:00"
+(1 row)
+
+COMMIT;
+select to_json(date '2014-05-28');
+ to_json
+--------------
+ "2014-05-28"
+(1 row)
+
+select to_json(date 'Infinity');
+ to_json
+------------
+ "infinity"
+(1 row)
+
+select to_json(timestamp 'Infinity');
+ to_json
+------------
+ "infinity"
+(1 row)
+
+select to_json(timestamptz 'Infinity');
+ to_json
+------------
+ "infinity"
+(1 row)
+
+--json_agg
+SELECT json_agg(q)
+ FROM ( SELECT $$a$$ || x AS b, y AS c,
+ ARRAY[ROW(x.*,ARRAY[1,2,3]),
+ ROW(y.*,ARRAY[4,5,6])] AS z
+ FROM generate_series(1,2) x,
+ generate_series(4,5) y) q;
+ json_agg
+-----------------------------------------------------------------------
+ [{"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}, +
+ {"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}, +
+ {"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}, +
+ {"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}]
+(1 row)
+
+SELECT json_agg(q ORDER BY x, y)
+ FROM rows q;
+ json_agg
+-----------------------
+ [{"x":1,"y":"txt1"}, +
+ {"x":2,"y":"txt2"}, +
+ {"x":3,"y":"txt3"}]
+(1 row)
+
+UPDATE rows SET x = NULL WHERE x = 1;
+SELECT json_agg(q ORDER BY x NULLS FIRST, y)
+ FROM rows q;
+ json_agg
+--------------------------
+ [{"x":null,"y":"txt1"}, +
+ {"x":2,"y":"txt2"}, +
+ {"x":3,"y":"txt3"}]
+(1 row)
+
+-- non-numeric output
+SELECT row_to_json(q)
+FROM (SELECT 'NaN'::float8 AS "float8field") q;
+ row_to_json
+-----------------------
+ {"float8field":"NaN"}
+(1 row)
+
+SELECT row_to_json(q)
+FROM (SELECT 'Infinity'::float8 AS "float8field") q;
+ row_to_json
+----------------------------
+ {"float8field":"Infinity"}
+(1 row)
+
+SELECT row_to_json(q)
+FROM (SELECT '-Infinity'::float8 AS "float8field") q;
+ row_to_json
+-----------------------------
+ {"float8field":"-Infinity"}
+(1 row)
+
+-- json input
+SELECT row_to_json(q)
+FROM (SELECT '{"a":1,"b": [2,3,4,"d","e","f"],"c":{"p":1,"q":2}}'::json AS "jsonfield") q;
+ row_to_json
+------------------------------------------------------------------
+ {"jsonfield":{"a":1,"b": [2,3,4,"d","e","f"],"c":{"p":1,"q":2}}}
+(1 row)
+
+-- json extraction functions
+CREATE TEMP TABLE test_json (
+ json_type text,
+ test_json json
+);
+INSERT INTO test_json VALUES
+('scalar','"a scalar"'),
+('array','["zero", "one","two",null,"four","five", [1,2,3],{"f1":9}]'),
+('object','{"field1":"val1","field2":"val2","field3":null, "field4": 4, "field5": [1,2,3], "field6": {"f1":9}}');
+SELECT test_json -> 'x'
+FROM test_json
+WHERE json_type = 'scalar';
+ ?column?
+----------
+
+(1 row)
+
+SELECT test_json -> 'x'
+FROM test_json
+WHERE json_type = 'array';
+ ?column?
+----------
+
+(1 row)
+
+SELECT test_json -> 'x'
+FROM test_json
+WHERE json_type = 'object';
+ ?column?
+----------
+
+(1 row)
+
+SELECT test_json->'field2'
+FROM test_json
+WHERE json_type = 'object';
+ ?column?
+----------
+ "val2"
+(1 row)
+
+SELECT test_json->>'field2'
+FROM test_json
+WHERE json_type = 'object';
+ ?column?
+----------
+ val2
+(1 row)
+
+SELECT test_json -> 2
+FROM test_json
+WHERE json_type = 'scalar';
+ ?column?
+----------
+
+(1 row)
+
+SELECT test_json -> 2
+FROM test_json
+WHERE json_type = 'array';
+ ?column?
+----------
+ "two"
+(1 row)
+
+SELECT test_json -> -1
+FROM test_json
+WHERE json_type = 'array';
+ ?column?
+----------
+ {"f1":9}
+(1 row)
+
+SELECT test_json -> 2
+FROM test_json
+WHERE json_type = 'object';
+ ?column?
+----------
+
+(1 row)
+
+SELECT test_json->>2
+FROM test_json
+WHERE json_type = 'array';
+ ?column?
+----------
+ two
+(1 row)
+
+SELECT test_json ->> 6 FROM test_json WHERE json_type = 'array';
+ ?column?
+----------
+ [1,2,3]
+(1 row)
+
+SELECT test_json ->> 7 FROM test_json WHERE json_type = 'array';
+ ?column?
+----------
+ {"f1":9}
+(1 row)
+
+SELECT test_json ->> 'field4' FROM test_json WHERE json_type = 'object';
+ ?column?
+----------
+ 4
+(1 row)
+
+SELECT test_json ->> 'field5' FROM test_json WHERE json_type = 'object';
+ ?column?
+----------
+ [1,2,3]
+(1 row)
+
+SELECT test_json ->> 'field6' FROM test_json WHERE json_type = 'object';
+ ?column?
+----------
+ {"f1":9}
+(1 row)
+
+SELECT json_object_keys(test_json)
+FROM test_json
+WHERE json_type = 'scalar';
+ERROR: cannot call json_object_keys on a scalar
+SELECT json_object_keys(test_json)
+FROM test_json
+WHERE json_type = 'array';
+ERROR: cannot call json_object_keys on an array
+SELECT json_object_keys(test_json)
+FROM test_json
+WHERE json_type = 'object';
+ json_object_keys
+------------------
+ field1
+ field2
+ field3
+ field4
+ field5
+ field6
+(6 rows)
+
+-- test extending object_keys resultset - initial resultset size is 256
+select count(*) from
+ (select json_object_keys(json_object(array_agg(g)))
+ from (select unnest(array['f'||n,n::text])as g
+ from generate_series(1,300) as n) x ) y;
+ count
+-------
+ 300
+(1 row)
+
+-- nulls
+select (test_json->'field3') is null as expect_false
+from test_json
+where json_type = 'object';
+ expect_false
+--------------
+ f
+(1 row)
+
+select (test_json->>'field3') is null as expect_true
+from test_json
+where json_type = 'object';
+ expect_true
+-------------
+ t
+(1 row)
+
+select (test_json->3) is null as expect_false
+from test_json
+where json_type = 'array';
+ expect_false
+--------------
+ f
+(1 row)
+
+select (test_json->>3) is null as expect_true
+from test_json
+where json_type = 'array';
+ expect_true
+-------------
+ t
+(1 row)
+
+-- corner cases
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> null::text;
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> null::int;
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> 1;
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> -1;
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> 'z';
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json -> '';
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json -> 1;
+ ?column?
+-------------
+ {"b": "cc"}
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json -> 3;
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json -> 'z';
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": "c", "b": null}'::json -> 'b';
+ ?column?
+----------
+ null
+(1 row)
+
+select '"foo"'::json -> 1;
+ ?column?
+----------
+
+(1 row)
+
+select '"foo"'::json -> 'z';
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> null::text;
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> null::int;
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> 1;
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> 'z';
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json ->> '';
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json ->> 1;
+ ?column?
+-------------
+ {"b": "cc"}
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json ->> 3;
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json ->> 'z';
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": "c", "b": null}'::json ->> 'b';
+ ?column?
+----------
+
+(1 row)
+
+select '"foo"'::json ->> 1;
+ ?column?
+----------
+
+(1 row)
+
+select '"foo"'::json ->> 'z';
+ ?column?
+----------
+
+(1 row)
+
+-- array length
+SELECT json_array_length('[1,2,3,{"f1":1,"f2":[5,6]},4]');
+ json_array_length
+-------------------
+ 5
+(1 row)
+
+SELECT json_array_length('[]');
+ json_array_length
+-------------------
+ 0
+(1 row)
+
+SELECT json_array_length('{"f1":1,"f2":[5,6]}');
+ERROR: cannot get array length of a non-array
+SELECT json_array_length('4');
+ERROR: cannot get array length of a scalar
+-- each
+select json_each('{"f1":[1,2,3],"f2":{"f3":1},"f4":null}');
+ json_each
+-------------------
+ (f1,"[1,2,3]")
+ (f2,"{""f3"":1}")
+ (f4,null)
+(3 rows)
+
+select * from json_each('{"f1":[1,2,3],"f2":{"f3":1},"f4":null,"f5":99,"f6":"stringy"}') q;
+ key | value
+-----+-----------
+ f1 | [1,2,3]
+ f2 | {"f3":1}
+ f4 | null
+ f5 | 99
+ f6 | "stringy"
+(5 rows)
+
+select json_each_text('{"f1":[1,2,3],"f2":{"f3":1},"f4":null,"f5":"null"}');
+ json_each_text
+-------------------
+ (f1,"[1,2,3]")
+ (f2,"{""f3"":1}")
+ (f4,)
+ (f5,null)
+(4 rows)
+
+select * from json_each_text('{"f1":[1,2,3],"f2":{"f3":1},"f4":null,"f5":99,"f6":"stringy"}') q;
+ key | value
+-----+----------
+ f1 | [1,2,3]
+ f2 | {"f3":1}
+ f4 |
+ f5 | 99
+ f6 | stringy
+(5 rows)
+
+-- extract_path, extract_path_as_text
+select json_extract_path('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f4','f6');
+ json_extract_path
+-------------------
+ "stringy"
+(1 row)
+
+select json_extract_path('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f2');
+ json_extract_path
+-------------------
+ {"f3":1}
+(1 row)
+
+select json_extract_path('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',0::text);
+ json_extract_path
+-------------------
+ "f3"
+(1 row)
+
+select json_extract_path('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',1::text);
+ json_extract_path
+-------------------
+ 1
+(1 row)
+
+select json_extract_path_text('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f4','f6');
+ json_extract_path_text
+------------------------
+ stringy
+(1 row)
+
+select json_extract_path_text('{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}','f2');
+ json_extract_path_text
+------------------------
+ {"f3":1}
+(1 row)
+
+select json_extract_path_text('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',0::text);
+ json_extract_path_text
+------------------------
+ f3
+(1 row)
+
+select json_extract_path_text('{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}','f2',1::text);
+ json_extract_path_text
+------------------------
+ 1
+(1 row)
+
+-- extract_path nulls
+select json_extract_path('{"f2":{"f3":1},"f4":{"f5":null,"f6":"stringy"}}','f4','f5') is null as expect_false;
+ expect_false
+--------------
+ f
+(1 row)
+
+select json_extract_path_text('{"f2":{"f3":1},"f4":{"f5":null,"f6":"stringy"}}','f4','f5') is null as expect_true;
+ expect_true
+-------------
+ t
+(1 row)
+
+select json_extract_path('{"f2":{"f3":1},"f4":[0,1,2,null]}','f4','3') is null as expect_false;
+ expect_false
+--------------
+ f
+(1 row)
+
+select json_extract_path_text('{"f2":{"f3":1},"f4":[0,1,2,null]}','f4','3') is null as expect_true;
+ expect_true
+-------------
+ t
+(1 row)
+
+-- extract_path operators
+select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f4','f6'];
+ ?column?
+-----------
+ "stringy"
+(1 row)
+
+select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f2'];
+ ?column?
+----------
+ {"f3":1}
+(1 row)
+
+select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f2','0'];
+ ?column?
+----------
+ "f3"
+(1 row)
+
+select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>array['f2','1'];
+ ?column?
+----------
+ 1
+(1 row)
+
+select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f4','f6'];
+ ?column?
+----------
+ stringy
+(1 row)
+
+select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f2'];
+ ?column?
+----------
+ {"f3":1}
+(1 row)
+
+select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f2','0'];
+ ?column?
+----------
+ f3
+(1 row)
+
+select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>>array['f2','1'];
+ ?column?
+----------
+ 1
+(1 row)
+
+-- corner cases for same
+select '{"a": {"b":{"c": "foo"}}}'::json #> '{}';
+ ?column?
+---------------------------
+ {"a": {"b":{"c": "foo"}}}
+(1 row)
+
+select '[1,2,3]'::json #> '{}';
+ ?column?
+----------
+ [1,2,3]
+(1 row)
+
+select '"foo"'::json #> '{}';
+ ?column?
+----------
+ "foo"
+(1 row)
+
+select '42'::json #> '{}';
+ ?column?
+----------
+ 42
+(1 row)
+
+select 'null'::json #> '{}';
+ ?column?
+----------
+ null
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #> array['a'];
+ ?column?
+--------------------
+ {"b":{"c": "foo"}}
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #> array['a', null];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #> array['a', ''];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','b'];
+ ?column?
+--------------
+ {"c": "foo"}
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','b','c'];
+ ?column?
+----------
+ "foo"
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','b','c','d'];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #> array['a','z','c'];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #> array['a','1','b'];
+ ?column?
+----------
+ "cc"
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #> array['a','z','b'];
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json #> array['1','b'];
+ ?column?
+----------
+ "cc"
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json #> array['z','b'];
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": null}]'::json #> array['1','b'];
+ ?column?
+----------
+ null
+(1 row)
+
+select '"foo"'::json #> array['z'];
+ ?column?
+----------
+
+(1 row)
+
+select '42'::json #> array['f2'];
+ ?column?
+----------
+
+(1 row)
+
+select '42'::json #> array['0'];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> '{}';
+ ?column?
+---------------------------
+ {"a": {"b":{"c": "foo"}}}
+(1 row)
+
+select '[1,2,3]'::json #>> '{}';
+ ?column?
+----------
+ [1,2,3]
+(1 row)
+
+select '"foo"'::json #>> '{}';
+ ?column?
+----------
+ foo
+(1 row)
+
+select '42'::json #>> '{}';
+ ?column?
+----------
+ 42
+(1 row)
+
+select 'null'::json #>> '{}';
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a'];
+ ?column?
+--------------------
+ {"b":{"c": "foo"}}
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a', null];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a', ''];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','b'];
+ ?column?
+--------------
+ {"c": "foo"}
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','b','c'];
+ ?column?
+----------
+ foo
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','b','c','d'];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": {"b":{"c": "foo"}}}'::json #>> array['a','z','c'];
+ ?column?
+----------
+
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #>> array['a','1','b'];
+ ?column?
+----------
+ cc
+(1 row)
+
+select '{"a": [{"b": "c"}, {"b": "cc"}]}'::json #>> array['a','z','b'];
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json #>> array['1','b'];
+ ?column?
+----------
+ cc
+(1 row)
+
+select '[{"b": "c"}, {"b": "cc"}]'::json #>> array['z','b'];
+ ?column?
+----------
+
+(1 row)
+
+select '[{"b": "c"}, {"b": null}]'::json #>> array['1','b'];
+ ?column?
+----------
+
+(1 row)
+
+select '"foo"'::json #>> array['z'];
+ ?column?
+----------
+
+(1 row)
+
+select '42'::json #>> array['f2'];
+ ?column?
+----------
+
+(1 row)
+
+select '42'::json #>> array['0'];
+ ?column?
+----------
+
+(1 row)
+
+-- array_elements
+select json_array_elements('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]');
+ json_array_elements
+-----------------------
+ 1
+ true
+ [1,[2,3]]
+ null
+ {"f1":1,"f2":[7,8,9]}
+ false
+ "stringy"
+(7 rows)
+
+select * from json_array_elements('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]') q;
+ value
+-----------------------
+ 1
+ true
+ [1,[2,3]]
+ null
+ {"f1":1,"f2":[7,8,9]}
+ false
+ "stringy"
+(7 rows)
+
+select json_array_elements_text('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]');
+ json_array_elements_text
+--------------------------
+ 1
+ true
+ [1,[2,3]]
+
+ {"f1":1,"f2":[7,8,9]}
+ false
+ stringy
+(7 rows)
+
+select * from json_array_elements_text('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false,"stringy"]') q;
+ value
+-----------------------
+ 1
+ true
+ [1,[2,3]]
+
+ {"f1":1,"f2":[7,8,9]}
+ false
+ stringy
+(7 rows)
+
+-- populate_record
+create type jpop as (a text, b int, c timestamp);
+select * from json_populate_record(null::jpop,'{"a":"blurfl","x":43.2}') q;
+ a | b | c
+--------+---+---
+ blurfl | |
+(1 row)
+
+select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"a":"blurfl","x":43.2}') q;
+ a | b | c
+--------+---+--------------------------
+ blurfl | 3 | Mon Dec 31 15:30:56 2012
+(1 row)
+
+select * from json_populate_record(null::jpop,'{"a":"blurfl","x":43.2}') q;
+ a | b | c
+--------+---+---
+ blurfl | |
+(1 row)
+
+select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"a":"blurfl","x":43.2}') q;
+ a | b | c
+--------+---+--------------------------
+ blurfl | 3 | Mon Dec 31 15:30:56 2012
+(1 row)
+
+select * from json_populate_record(null::jpop,'{"a":[100,200,false],"x":43.2}') q;
+ a | b | c
+-----------------+---+---
+ [100,200,false] | |
+(1 row)
+
+select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"a":[100,200,false],"x":43.2}') q;
+ a | b | c
+-----------------+---+--------------------------
+ [100,200,false] | 3 | Mon Dec 31 15:30:56 2012
+(1 row)
+
+select * from json_populate_record(row('x',3,'2012-12-31 15:30:56')::jpop,'{"c":[100,200,false],"x":43.2}') q;
+ERROR: invalid input syntax for type timestamp: "[100,200,false]"
+-- populate_recordset
+select * from json_populate_recordset(null::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+--------+---+--------------------------
+ blurfl | |
+ | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+--------+----+--------------------------
+ blurfl | 99 |
+ def | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+select * from json_populate_recordset(null::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+--------+---+--------------------------
+ blurfl | |
+ | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+--------+----+--------------------------
+ blurfl | 99 |
+ def | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":[100,200,300],"x":43.2},{"a":{"z":true},"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+---------------+----+--------------------------
+ [100,200,300] | 99 |
+ {"z":true} | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+select * from json_populate_recordset(row('def',99,null)::jpop,'[{"c":[100,200,300],"x":43.2},{"a":{"z":true},"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ERROR: invalid input syntax for type timestamp: "[100,200,300]"
+create type jpop2 as (a int, b json, c int, d int);
+select * from json_populate_recordset(null::jpop2, '[{"a":2,"c":3,"b":{"z":4},"d":6}]') q;
+ a | b | c | d
+---+---------+---+---
+ 2 | {"z":4} | 3 | 6
+(1 row)
+
+select * from json_populate_recordset(null::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+--------+---+--------------------------
+ blurfl | |
+ | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":"blurfl","x":43.2},{"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+--------+----+--------------------------
+ blurfl | 99 |
+ def | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+select * from json_populate_recordset(row('def',99,null)::jpop,'[{"a":[100,200,300],"x":43.2},{"a":{"z":true},"b":3,"c":"2012-01-20 10:42:53"}]') q;
+ a | b | c
+---------------+----+--------------------------
+ [100,200,300] | 99 |
+ {"z":true} | 3 | Fri Jan 20 10:42:53 2012
+(2 rows)
+
+-- handling of unicode surrogate pairs
+select json '{ "a": "\ud83d\ude04\ud83d\udc36" }' -> 'a' as correct_in_utf8;
+ correct_in_utf8
+----------------------------
+ "\ud83d\ude04\ud83d\udc36"
+(1 row)
+
+select json '{ "a": "\ud83d\ud83d" }' -> 'a'; -- 2 high surrogates in a row
+ERROR: invalid input syntax for type json
+DETAIL: Unicode high surrogate must not follow a high surrogate.
+CONTEXT: JSON data, line 1: { "a":...
+select json '{ "a": "\ude04\ud83d" }' -> 'a'; -- surrogates in wrong order
+ERROR: invalid input syntax for type json
+DETAIL: Unicode low surrogate must follow a high surrogate.
+CONTEXT: JSON data, line 1: { "a":...
+select json '{ "a": "\ud83dX" }' -> 'a'; -- orphan high surrogate
+ERROR: invalid input syntax for type json
+DETAIL: Unicode low surrogate must follow a high surrogate.
+CONTEXT: JSON data, line 1: { "a":...
+select json '{ "a": "\ude04X" }' -> 'a'; -- orphan low surrogate
+ERROR: invalid input syntax for type json
+DETAIL: Unicode low surrogate must follow a high surrogate.
+CONTEXT: JSON data, line 1: { "a":...
+--handling of simple unicode escapes
+select json '{ "a": "the Copyright \u00a9 sign" }' as correct_in_utf8;
+ correct_in_utf8
+---------------------------------------
+ { "a": "the Copyright \u00a9 sign" }
+(1 row)
+
+select json '{ "a": "dollar \u0024 character" }' as correct_everywhere;
+ correct_everywhere
+-------------------------------------
+ { "a": "dollar \u0024 character" }
+(1 row)
+
+select json '{ "a": "dollar \\u0024 character" }' as not_an_escape;
+ not_an_escape
+--------------------------------------
+ { "a": "dollar \\u0024 character" }
+(1 row)
+
+select json '{ "a": "null \u0000 escape" }' as not_unescaped;
+ not_unescaped
+--------------------------------
+ { "a": "null \u0000 escape" }
+(1 row)
+
+select json '{ "a": "null \\u0000 escape" }' as not_an_escape;
+ not_an_escape
+---------------------------------
+ { "a": "null \\u0000 escape" }
+(1 row)
+
+select json '{ "a": "the Copyright \u00a9 sign" }' ->> 'a' as correct_in_utf8;
+ correct_in_utf8
+----------------------
+ the Copyright © sign
+(1 row)
+
+select json '{ "a": "dollar \u0024 character" }' ->> 'a' as correct_everywhere;
+ correct_everywhere
+--------------------
+ dollar $ character
+(1 row)
+
+select json '{ "a": "dollar \\u0024 character" }' ->> 'a' as not_an_escape;
+ not_an_escape
+-------------------------
+ dollar \u0024 character
+(1 row)
+
+select json '{ "a": "null \u0000 escape" }' ->> 'a' as fails;
+ERROR: unsupported Unicode escape sequence
+DETAIL: \u0000 cannot be converted to text.
+CONTEXT: JSON data, line 1: { "a":...
+select json '{ "a": "null \\u0000 escape" }' ->> 'a' as not_an_escape;
+ not_an_escape
+--------------------
+ null \u0000 escape
+(1 row)
+
+--json_typeof() function
+select value, json_typeof(value)
+ from (values (json '123.4'),
+ (json '-1'),
+ (json '"foo"'),
+ (json 'true'),
+ (json 'false'),
+ (json 'null'),
+ (json '[1, 2, 3]'),
+ (json '[]'),
+ (json '{"x":"foo", "y":123}'),
+ (json '{}'),
+ (NULL::json))
+ as data(value);
+ value | json_typeof
+----------------------+-------------
+ 123.4 | number
+ -1 | number
+ "foo" | string
+ true | boolean
+ false | boolean
+ null | null
+ [1, 2, 3] | array
+ [] | array
+ {"x":"foo", "y":123} | object
+ {} | object
+ |
+(11 rows)
+
+-- json_build_array, json_build_object, json_object_agg
+SELECT json_build_array('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
+ json_build_array
+-----------------------------------------------------------------------
+ ["a", 1, "b", 1.2, "c", true, "d", null, "e", {"x": 3, "y": [1,2,3]}]
+(1 row)
+
+SELECT json_build_object('a',1,'b',1.2,'c',true,'d',null,'e',json '{"x": 3, "y": [1,2,3]}');
+ json_build_object
+----------------------------------------------------------------------------
+ {"a" : 1, "b" : 1.2, "c" : true, "d" : null, "e" : {"x": 3, "y": [1,2,3]}}
+(1 row)
+
+SELECT json_build_object(
+ 'a', json_build_object('b',false,'c',99),
+ 'd', json_build_object('e',array[9,8,7]::int[],
+ 'f', (select row_to_json(r) from ( select relkind, oid::regclass as name from pg_class where relname = 'pg_class') r)));
+ json_build_object
+-------------------------------------------------------------------------------------------------
+ {"a" : {"b" : false, "c" : 99}, "d" : {"e" : [9,8,7], "f" : {"relkind":"r","name":"pg_class"}}}
+(1 row)
+
+-- empty objects/arrays
+SELECT json_build_array();
+ json_build_array
+------------------
+ []
+(1 row)
+
+SELECT json_build_object();
+ json_build_object
+-------------------
+ {}
+(1 row)
+
+-- make sure keys are quoted
+SELECT json_build_object(1,2);
+ json_build_object
+-------------------
+ {"1" : 2}
+(1 row)
+
+-- keys must be scalar and not null
+SELECT json_build_object(null,2);
+ERROR: argument 1 cannot be null
+HINT: Object keys should be text.
+SELECT json_build_object(r,2) FROM (SELECT 1 AS a, 2 AS b) r;
+ERROR: key value must be scalar, not array, composite, or json
+SELECT json_build_object(json '{"a":1,"b":2}', 3);
+ERROR: key value must be scalar, not array, composite, or json
+SELECT json_build_object('{1,2,3}'::int[], 3);
+ERROR: key value must be scalar, not array, composite, or json
+CREATE TEMP TABLE foo (serial_num int, name text, type text);
+INSERT INTO foo VALUES (847001,'t15','GE1043');
+INSERT INTO foo VALUES (847002,'t16','GE1043');
+INSERT INTO foo VALUES (847003,'sub-alpha','GESS90');
+SELECT json_build_object('turbines',json_object_agg(serial_num,json_build_object('name',name,'type',type)))
+FROM foo;
+ json_build_object
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------
+ {"turbines" : { "847001" : {"name" : "t15", "type" : "GE1043"}, "847002" : {"name" : "t16", "type" : "GE1043"}, "847003" : {"name" : "sub-alpha", "type" : "GESS90"} }}
+(1 row)
+
+SELECT json_object_agg(name, type) FROM foo;
+ json_object_agg
+----------------------------------------------------------------
+ { "t15" : "GE1043", "t16" : "GE1043", "sub-alpha" : "GESS90" }
+(1 row)
+
+INSERT INTO foo VALUES (999999, NULL, 'bar');
+SELECT json_object_agg(name, type) FROM foo;
+ERROR: field name must not be null
+-- json_object
+-- one dimension
+SELECT json_object('{a,1,b,2,3,NULL,"d e f","a b c"}');
+ json_object
+-------------------------------------------------------
+ {"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
+(1 row)
+
+-- same but with two dimensions
+SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
+ json_object
+-------------------------------------------------------
+ {"a" : "1", "b" : "2", "3" : null, "d e f" : "a b c"}
+(1 row)
+
+-- odd number error
+SELECT json_object('{a,b,c}');
+ERROR: array must have even number of elements
+-- one column error
+SELECT json_object('{{a},{b}}');
+ERROR: array must have two columns
+-- too many columns error
+SELECT json_object('{{a,b,c},{b,c,d}}');
+ERROR: array must have two columns
+-- too many dimensions error
+SELECT json_object('{{{a,b},{c,d}},{{b,c},{d,e}}}');
+ERROR: wrong number of array subscripts
+--two argument form of json_object
+select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c"}');
+ json_object
+------------------------------------------------------
+ {"a" : "1", "b" : "2", "c" : "3", "d e f" : "a b c"}
+(1 row)
+
+-- too many dimensions
+SELECT json_object('{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}', '{{a,1},{b,2},{3,NULL},{"d e f","a b c"}}');
+ERROR: wrong number of array subscripts
+-- mismatched dimensions
+select json_object('{a,b,c,"d e f",g}','{1,2,3,"a b c"}');
+ERROR: mismatched array dimensions
+select json_object('{a,b,c,"d e f"}','{1,2,3,"a b c",g}');
+ERROR: mismatched array dimensions
+-- null key error
+select json_object('{a,b,NULL,"d e f"}','{1,2,3,"a b c"}');
+ERROR: null value not allowed for object key
+-- empty key is allowed
+select json_object('{a,b,"","d e f"}','{1,2,3,"a b c"}');
+ json_object
+-----------------------------------------------------
+ {"a" : "1", "b" : "2", "" : "3", "d e f" : "a b c"}
+(1 row)
+
+-- json_to_record and json_to_recordset
+select * from json_to_record('{"a":1,"b":"foo","c":"bar"}')
+ as x(a int, b text, d text);
+ a | b | d
+---+-----+---
+ 1 | foo |
+(1 row)
+
+select * from json_to_recordset('[{"a":1,"b":"foo","d":false},{"a":2,"b":"bar","c":true}]')
+ as x(a int, b text, c boolean);
+ a | b | c
+---+-----+---
+ 1 | foo |
+ 2 | bar | t
+(2 rows)
+
+select * from json_to_recordset('[{"a":1,"b":{"d":"foo"},"c":true},{"a":2,"c":false,"b":{"d":"bar"}}]')
+ as x(a int, b json, c boolean);
+ a | b | c
+---+-------------+---
+ 1 | {"d":"foo"} | t
+ 2 | {"d":"bar"} | f
+(2 rows)
+
+-- json_strip_nulls
+select json_strip_nulls(null);
+ json_strip_nulls
+------------------
+
+(1 row)
+
+select json_strip_nulls('1');
+ json_strip_nulls
+------------------
+ 1
+(1 row)
+
+select json_strip_nulls('"a string"');
+ json_strip_nulls
+------------------
+ "a string"
+(1 row)
+
+select json_strip_nulls('null');
+ json_strip_nulls
+------------------
+ null
+(1 row)
+
+select json_strip_nulls('[1,2,null,3,4]');
+ json_strip_nulls
+------------------
+ [1,2,null,3,4]
+(1 row)
+
+select json_strip_nulls('{"a":1,"b":null,"c":[2,null,3],"d":{"e":4,"f":null}}');
+ json_strip_nulls
+------------------------------------
+ {"a":1,"c":[2,null,3],"d":{"e":4}}
+(1 row)
+
+select json_strip_nulls('[1,{"a":1,"b":null,"c":2},3]');
+ json_strip_nulls
+---------------------
+ [1,{"a":1,"c":2},3]
+(1 row)
+
+-- an empty object is not null and should not be stripped
+select json_strip_nulls('{"a": {"b": null, "c": null}, "d": {} }');
+ json_strip_nulls
+------------------
+ {"a":{},"d":{}}
+(1 row)
+
projects / postgresql / blobdiff