990 lines
28 KiB
Plaintext
990 lines
28 KiB
Plaintext
-- Strings.
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SELECT '""'::json; -- OK.
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json
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------
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""
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(1 row)
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SELECT $$''$$::json; -- ERROR, single quotes are not allowed
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ERROR: invalid input syntax for type json
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LINE 1: SELECT $$''$$::json;
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^
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DETAIL: Token "'" is invalid.
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CONTEXT: JSON data, line 1: '...
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SELECT '"abc"'::json; -- OK
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json
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-------
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"abc"
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(1 row)
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SELECT '"abc'::json; -- ERROR, quotes not closed
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '"abc'::json;
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^
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DETAIL: Token ""abc" is invalid.
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CONTEXT: JSON data, line 1: "abc
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SELECT '"abc
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def"'::json; -- ERROR, unescaped newline in string constant
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '"abc
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^
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DETAIL: Character with value 0x0a must be escaped.
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CONTEXT: JSON data, line 1: "abc
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SELECT '"\n\"\\"'::json; -- OK, legal escapes
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json
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----------
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"\n\"\\"
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(1 row)
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SELECT '"\v"'::json; -- ERROR, not a valid JSON escape
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '"\v"'::json;
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^
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DETAIL: Escape sequence "\v" is invalid.
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CONTEXT: JSON data, line 1: "\v...
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SELECT '"\u"'::json; -- ERROR, incomplete escape
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '"\u"'::json;
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^
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DETAIL: "\u" must be followed by four hexadecimal digits.
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CONTEXT: JSON data, line 1: "\u"
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SELECT '"\u00"'::json; -- ERROR, incomplete escape
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '"\u00"'::json;
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^
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DETAIL: "\u" must be followed by four hexadecimal digits.
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CONTEXT: JSON data, line 1: "\u00"
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SELECT '"\u000g"'::json; -- ERROR, g is not a hex digit
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '"\u000g"'::json;
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^
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DETAIL: "\u" must be followed by four hexadecimal digits.
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CONTEXT: JSON data, line 1: "\u000g...
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SELECT '"\u0000"'::json; -- OK, legal escape
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json
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----------
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"\u0000"
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(1 row)
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SELECT '"\uaBcD"'::json; -- OK, uppercase and lower case both OK
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json
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----------
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"\uaBcD"
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(1 row)
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-- Numbers.
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SELECT '1'::json; -- OK
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json
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------
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1
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(1 row)
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SELECT '0'::json; -- OK
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json
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------
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0
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(1 row)
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SELECT '01'::json; -- ERROR, not valid according to JSON spec
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '01'::json;
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^
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DETAIL: Token "01" is invalid.
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CONTEXT: JSON data, line 1: 01
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SELECT '0.1'::json; -- OK
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json
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------
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0.1
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(1 row)
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SELECT '9223372036854775808'::json; -- OK, even though it's too large for int8
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json
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---------------------
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9223372036854775808
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(1 row)
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SELECT '1e100'::json; -- OK
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json
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-------
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1e100
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(1 row)
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SELECT '1.3e100'::json; -- OK
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json
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---------
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1.3e100
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(1 row)
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SELECT '1f2'::json; -- ERROR
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '1f2'::json;
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^
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DETAIL: Token "1f2" is invalid.
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CONTEXT: JSON data, line 1: 1f2
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SELECT '0.x1'::json; -- ERROR
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '0.x1'::json;
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^
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DETAIL: Token "0.x1" is invalid.
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CONTEXT: JSON data, line 1: 0.x1
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SELECT '1.3ex100'::json; -- ERROR
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '1.3ex100'::json;
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^
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DETAIL: Token "1.3ex100" is invalid.
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CONTEXT: JSON data, line 1: 1.3ex100
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-- Arrays.
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SELECT '[]'::json; -- OK
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json
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------
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[]
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(1 row)
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SELECT '[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]'::json; -- OK
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json
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----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]
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(1 row)
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SELECT '[1,2]'::json; -- OK
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json
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-------
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[1,2]
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(1 row)
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SELECT '[1,2,]'::json; -- ERROR, trailing comma
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '[1,2,]'::json;
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^
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DETAIL: Expected JSON value, but found "]".
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CONTEXT: JSON data, line 1: [1,2,]
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SELECT '[1,2'::json; -- ERROR, no closing bracket
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '[1,2'::json;
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^
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DETAIL: The input string ended unexpectedly.
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CONTEXT: JSON data, line 1: [1,2
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SELECT '[1,[2]'::json; -- ERROR, no closing bracket
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '[1,[2]'::json;
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^
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DETAIL: The input string ended unexpectedly.
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CONTEXT: JSON data, line 1: [1,[2]
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-- Objects.
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SELECT '{}'::json; -- OK
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json
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------
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{}
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(1 row)
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SELECT '{"abc"}'::json; -- ERROR, no value
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '{"abc"}'::json;
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^
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DETAIL: Expected ":", but found "}".
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CONTEXT: JSON data, line 1: {"abc"}
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SELECT '{"abc":1}'::json; -- OK
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json
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-----------
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{"abc":1}
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(1 row)
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SELECT '{1:"abc"}'::json; -- ERROR, keys must be strings
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '{1:"abc"}'::json;
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^
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DETAIL: Expected string or "}", but found "1".
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CONTEXT: JSON data, line 1: {1...
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SELECT '{"abc",1}'::json; -- ERROR, wrong separator
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '{"abc",1}'::json;
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^
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DETAIL: Expected ":", but found ",".
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CONTEXT: JSON data, line 1: {"abc",...
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SELECT '{"abc"=1}'::json; -- ERROR, totally wrong separator
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '{"abc"=1}'::json;
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^
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DETAIL: Token "=" is invalid.
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CONTEXT: JSON data, line 1: {"abc"=...
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SELECT '{"abc"::1}'::json; -- ERROR, another wrong separator
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '{"abc"::1}'::json;
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^
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DETAIL: Expected JSON value, but found ":".
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CONTEXT: JSON data, line 1: {"abc"::...
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SELECT '{"abc":1,"def":2,"ghi":[3,4],"hij":{"klm":5,"nop":[6]}}'::json; -- OK
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json
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---------------------------------------------------------
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{"abc":1,"def":2,"ghi":[3,4],"hij":{"klm":5,"nop":[6]}}
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(1 row)
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SELECT '{"abc":1:2}'::json; -- ERROR, colon in wrong spot
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '{"abc":1:2}'::json;
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^
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DETAIL: Expected "," or "}", but found ":".
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CONTEXT: JSON data, line 1: {"abc":1:...
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SELECT '{"abc":1,3}'::json; -- ERROR, no value
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ERROR: invalid input syntax for type json
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LINE 1: SELECT '{"abc":1,3}'::json;
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^
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DETAIL: Expected string, but found "3".
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CONTEXT: JSON data, line 1: {"abc":1,3...
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-- Miscellaneous stuff.
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SELECT 'true'::json; -- OK
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json
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------
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true
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(1 row)
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SELECT 'false'::json; -- OK
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json
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-------
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false
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(1 row)
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SELECT 'null'::json; -- OK
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json
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------
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null
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(1 row)
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SELECT ' true '::json; -- OK, even with extra whitespace
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json
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--------
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true
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(1 row)
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SELECT 'true false'::json; -- ERROR, too many values
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ERROR: invalid input syntax for type json
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LINE 1: SELECT 'true false'::json;
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^
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DETAIL: Expected end of input, but found "false".
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CONTEXT: JSON data, line 1: true false
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SELECT 'true, false'::json; -- ERROR, too many values
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ERROR: invalid input syntax for type json
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LINE 1: SELECT 'true, false'::json;
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^
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DETAIL: Expected end of input, but found ",".
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CONTEXT: JSON data, line 1: true,...
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SELECT 'truf'::json; -- ERROR, not a keyword
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ERROR: invalid input syntax for type json
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LINE 1: SELECT 'truf'::json;
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^
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DETAIL: Token "truf" is invalid.
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CONTEXT: JSON data, line 1: truf
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SELECT 'trues'::json; -- ERROR, not a keyword
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ERROR: invalid input syntax for type json
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LINE 1: SELECT 'trues'::json;
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^
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DETAIL: Token "trues" is invalid.
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CONTEXT: JSON data, line 1: trues
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SELECT ''::json; -- ERROR, no value
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ERROR: invalid input syntax for type json
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LINE 1: SELECT ''::json;
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^
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DETAIL: The input string ended unexpectedly.
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CONTEXT: JSON data, line 1:
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SELECT ' '::json; -- ERROR, no value
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ERROR: invalid input syntax for type json
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LINE 1: SELECT ' '::json;
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^
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DETAIL: The input string ended unexpectedly.
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CONTEXT: JSON data, line 1:
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--constructors
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-- array_to_json
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SELECT array_to_json(array(select 1 as a));
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array_to_json
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---------------
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[1]
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(1 row)
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SELECT array_to_json(array_agg(q),false) from (select x as b, x * 2 as c from generate_series(1,3) x) q;
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array_to_json
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---------------------------------------------
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[{"b":1,"c":2},{"b":2,"c":4},{"b":3,"c":6}]
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(1 row)
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SELECT array_to_json(array_agg(q),true) from (select x as b, x * 2 as c from generate_series(1,3) x) q;
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array_to_json
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-----------------
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[{"b":1,"c":2},+
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{"b":2,"c":4},+
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{"b":3,"c":6}]
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(1 row)
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SELECT array_to_json(array_agg(q),false)
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FROM ( SELECT $$a$$ || x AS b, y AS c,
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ARRAY[ROW(x.*,ARRAY[1,2,3]),
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ROW(y.*,ARRAY[4,5,6])] AS z
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FROM generate_series(1,2) x,
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generate_series(4,5) y) q;
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array_to_json
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-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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[{"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]}]}]
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(1 row)
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SELECT array_to_json(array_agg(x),false) from generate_series(5,10) x;
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array_to_json
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----------------
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[5,6,7,8,9,10]
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(1 row)
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SELECT array_to_json('{{1,5},{99,100}}'::int[]);
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array_to_json
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------------------
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[[1,5],[99,100]]
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(1 row)
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-- row_to_json
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SELECT row_to_json(row(1,'foo'));
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row_to_json
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---------------------
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{"f1":1,"f2":"foo"}
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(1 row)
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SELECT row_to_json(q)
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FROM (SELECT $$a$$ || x AS b,
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y AS c,
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ARRAY[ROW(x.*,ARRAY[1,2,3]),
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ROW(y.*,ARRAY[4,5,6])] AS z
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FROM generate_series(1,2) x,
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generate_series(4,5) y) q;
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row_to_json
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--------------------------------------------------------------------
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{"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
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{"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
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{"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
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{"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
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(4 rows)
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SELECT row_to_json(q,true)
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FROM (SELECT $$a$$ || x AS b,
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y AS c,
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ARRAY[ROW(x.*,ARRAY[1,2,3]),
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ROW(y.*,ARRAY[4,5,6])] AS z
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FROM generate_series(1,2) x,
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generate_series(4,5) y) q;
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row_to_json
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-----------------------------------------------------
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{"b":"a1", +
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"c":4, +
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"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
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{"b":"a1", +
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"c":5, +
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"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
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{"b":"a2", +
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"c":4, +
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"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}
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{"b":"a2", +
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"c":5, +
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"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}
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(4 rows)
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CREATE TEMP TABLE rows AS
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SELECT x, 'txt' || x as y
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FROM generate_series(1,3) AS x;
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SELECT row_to_json(q,true)
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FROM rows q;
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row_to_json
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--------------
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{"x":1, +
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"y":"txt1"}
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{"x":2, +
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"y":"txt2"}
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{"x":3, +
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"y":"txt3"}
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(3 rows)
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SELECT row_to_json(row((select array_agg(x) as d from generate_series(5,10) x)),false);
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row_to_json
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-----------------------
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{"f1":[5,6,7,8,9,10]}
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(1 row)
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--json_agg
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SELECT json_agg(q)
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FROM ( SELECT $$a$$ || x AS b, y AS c,
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ARRAY[ROW(x.*,ARRAY[1,2,3]),
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ROW(y.*,ARRAY[4,5,6])] AS z
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FROM generate_series(1,2) x,
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generate_series(4,5) y) q;
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json_agg
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-----------------------------------------------------------------------
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[{"b":"a1","c":4,"z":[{"f1":1,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}, +
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{"b":"a1","c":5,"z":[{"f1":1,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}, +
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{"b":"a2","c":4,"z":[{"f1":2,"f2":[1,2,3]},{"f1":4,"f2":[4,5,6]}]}, +
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{"b":"a2","c":5,"z":[{"f1":2,"f2":[1,2,3]},{"f1":5,"f2":[4,5,6]}]}]
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(1 row)
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SELECT json_agg(q)
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FROM rows q;
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json_agg
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-----------------------
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[{"x":1,"y":"txt1"}, +
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{"x":2,"y":"txt2"}, +
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{"x":3,"y":"txt3"}]
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(1 row)
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-- non-numeric output
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SELECT row_to_json(q)
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FROM (SELECT 'NaN'::float8 AS "float8field") q;
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row_to_json
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-----------------------
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{"float8field":"NaN"}
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(1 row)
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SELECT row_to_json(q)
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FROM (SELECT 'Infinity'::float8 AS "float8field") q;
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row_to_json
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----------------------------
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{"float8field":"Infinity"}
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(1 row)
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SELECT row_to_json(q)
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FROM (SELECT '-Infinity'::float8 AS "float8field") q;
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row_to_json
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-----------------------------
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{"float8field":"-Infinity"}
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(1 row)
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-- json input
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SELECT row_to_json(q)
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FROM (SELECT '{"a":1,"b": [2,3,4,"d","e","f"],"c":{"p":1,"q":2}}'::json AS "jsonfield") q;
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row_to_json
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------------------------------------------------------------------
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{"jsonfield":{"a":1,"b": [2,3,4,"d","e","f"],"c":{"p":1,"q":2}}}
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(1 row)
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-- json extraction functions
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CREATE TEMP TABLE test_json (
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json_type text,
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test_json json
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);
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INSERT INTO test_json VALUES
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('scalar','"a scalar"'),
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('array','["zero", "one","two",null,"four","five"]'),
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('object','{"field1":"val1","field2":"val2","field3":null}');
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SELECT test_json -> 'x'
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FROM test_json
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WHERE json_type = 'scalar';
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ERROR: cannot extract element from a scalar
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SELECT test_json -> 'x'
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FROM test_json
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WHERE json_type = 'array';
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ERROR: cannot extract field from a non-object
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SELECT test_json -> 'x'
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FROM test_json
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WHERE json_type = 'object';
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?column?
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----------
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(1 row)
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|
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';
|
|
ERROR: cannot extract element from a scalar
|
|
SELECT test_json -> 2
|
|
FROM test_json
|
|
WHERE json_type = 'array';
|
|
?column?
|
|
----------
|
|
"two"
|
|
(1 row)
|
|
|
|
SELECT test_json -> 2
|
|
FROM test_json
|
|
WHERE json_type = 'object';
|
|
ERROR: cannot extract array element from a non-array
|
|
SELECT test_json->>2
|
|
FROM test_json
|
|
WHERE json_type = 'array';
|
|
?column?
|
|
----------
|
|
two
|
|
(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
|
|
(3 rows)
|
|
|
|
-- 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)
|
|
|
|
-- 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)
|
|
|
|
-- same using array literals
|
|
select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>'{f4,f6}';
|
|
?column?
|
|
-----------
|
|
"stringy"
|
|
(1 row)
|
|
|
|
select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>'{f2}';
|
|
?column?
|
|
----------
|
|
{"f3":1}
|
|
(1 row)
|
|
|
|
select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>'{f2,0}';
|
|
?column?
|
|
----------
|
|
"f3"
|
|
(1 row)
|
|
|
|
select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>'{f2,1}';
|
|
?column?
|
|
----------
|
|
1
|
|
(1 row)
|
|
|
|
select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>>'{f4,f6}';
|
|
?column?
|
|
----------
|
|
stringy
|
|
(1 row)
|
|
|
|
select '{"f2":{"f3":1},"f4":{"f5":99,"f6":"stringy"}}'::json#>>'{f2}';
|
|
?column?
|
|
----------
|
|
{"f3":1}
|
|
(1 row)
|
|
|
|
select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>>'{f2,0}';
|
|
?column?
|
|
----------
|
|
f3
|
|
(1 row)
|
|
|
|
select '{"f2":["f3",1],"f4":{"f5":99,"f6":"stringy"}}'::json#>>'{f2,1}';
|
|
?column?
|
|
----------
|
|
1
|
|
(1 row)
|
|
|
|
-- array_elements
|
|
select json_array_elements('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false]');
|
|
json_array_elements
|
|
-----------------------
|
|
1
|
|
true
|
|
[1,[2,3]]
|
|
null
|
|
{"f1":1,"f2":[7,8,9]}
|
|
false
|
|
(6 rows)
|
|
|
|
select * from json_array_elements('[1,true,[1,[2,3]],null,{"f1":1,"f2":[7,8,9]},false]') q;
|
|
value
|
|
-----------------------
|
|
1
|
|
true
|
|
[1,[2,3]]
|
|
null
|
|
{"f1":1,"f2":[7,8,9]}
|
|
false
|
|
(6 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}', true) 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}', true) 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}', true) 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}', true) 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}', true) 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"}]',false) 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"}]',false) 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"}]',true) 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"}]',true) 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"}]',true) 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"}]',true) q;
|
|
ERROR: invalid input syntax for type timestamp: "[100,200,300]"
|
|
-- using the default use_json_as_text argument
|
|
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;
|
|
ERROR: cannot call json_populate_recordset on a nested object
|
|
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: cannot call json_populate_recordset on a nested object
|
|
-- handling of unicode surrogate pairs
|
|
select json '{ "a": "\ud83d\ude04\ud83d\udc36" }' -> 'a' as correct_in_utf8;
|
|
ERROR: invalid input syntax for type json
|
|
DETAIL: Unicode escape values cannot be used for code point values above 007F when the server encoding is not UTF8.
|
|
CONTEXT: JSON data, line 1: { "a":...
|
|
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" }' ->> 'a' as correct_in_utf8;
|
|
ERROR: invalid input syntax for type json
|
|
DETAIL: Unicode escape values cannot be used for code point values above 007F when the server encoding is not UTF8.
|
|
CONTEXT: JSON data, line 1: { "a":...
|
|
select json '{ "a": "dollar \u0024 character" }' ->> 'a' as correct_everywhere;
|
|
correct_everywhere
|
|
--------------------
|
|
dollar $ character
|
|
(1 row)
|
|
|
|
select json '{ "a": "null \u0000 escape" }' ->> 'a' as not_unescaped;
|
|
not_unescaped
|
|
--------------------
|
|
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)
|
|
|