1668 lines
41 KiB
Plaintext
1668 lines
41 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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-- see json_encoding test for input with unicode escapes
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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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-- Recursion.
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SET max_stack_depth = '100kB';
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SELECT repeat('[', 10000)::json;
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ERROR: stack depth limit exceeded
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HINT: Increase the configuration parameter "max_stack_depth" (currently 100kB), after ensuring the platform's stack depth limit is adequate.
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SELECT repeat('{"a":', 10000)::json;
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ERROR: stack depth limit exceeded
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HINT: Increase the configuration parameter "max_stack_depth" (currently 100kB), after ensuring the platform's stack depth limit is adequate.
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RESET max_stack_depth;
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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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-- to_json, timestamps
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select to_json(timestamp '2014-05-28 12:22:35.614298');
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to_json
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------------------------------
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"2014-05-28T12:22:35.614298"
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(1 row)
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BEGIN;
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SET LOCAL TIME ZONE 10.5;
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select to_json(timestamptz '2014-05-28 12:22:35.614298-04');
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to_json
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------------------------------------
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"2014-05-29T02:52:35.614298+10:30"
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(1 row)
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SET LOCAL TIME ZONE -8;
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select to_json(timestamptz '2014-05-28 12:22:35.614298-04');
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to_json
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------------------------------------
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"2014-05-28T08:22:35.614298-08:00"
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(1 row)
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COMMIT;
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select to_json(date '2014-05-28');
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to_json
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--------------
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"2014-05-28"
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(1 row)
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select to_json(date 'Infinity');
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to_json
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------------
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"infinity"
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(1 row)
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select to_json(date '-Infinity');
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to_json
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-------------
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"-infinity"
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(1 row)
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select to_json(timestamp 'Infinity');
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to_json
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------------
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"infinity"
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(1 row)
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select to_json(timestamp '-Infinity');
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to_json
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-------------
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"-infinity"
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(1 row)
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select to_json(timestamptz 'Infinity');
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to_json
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------------
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"infinity"
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(1 row)
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select to_json(timestamptz '-Infinity');
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to_json
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-------------
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"-infinity"
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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 ORDER BY x, y)
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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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UPDATE rows SET x = NULL WHERE x = 1;
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SELECT json_agg(q ORDER BY x NULLS FIRST, y)
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FROM rows q;
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json_agg
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--------------------------
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[{"x":null,"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)
|
|
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)
|
|
|
|
--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
|
|
-- empty object, one dimension
|
|
SELECT json_object('{}');
|
|
json_object
|
|
-------------
|
|
{}
|
|
(1 row)
|
|
|
|
-- empty object, two dimensions
|
|
SELECT json_object('{}', '{}');
|
|
json_object
|
|
-------------
|
|
{}
|
|
(1 row)
|
|
|
|
-- 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)
|
|
|
|
select *, c is null as c_is_null
|
|
from json_to_record('{"a":1, "b":{"c":16, "d":2}, "x":8}'::json)
|
|
as t(a int, b json, c text, x int);
|
|
a | b | c | x | c_is_null
|
|
---+-----------------+---+---+-----------
|
|
1 | {"c":16, "d":2} | | 8 | t
|
|
(1 row)
|
|
|
|
select *, c is null as c_is_null
|
|
from json_to_recordset('[{"a":1, "b":{"c":16, "d":2}, "x":8}]'::json)
|
|
as t(a int, b json, c text, x int);
|
|
a | b | c | x | c_is_null
|
|
---+-----------------+---+---+-----------
|
|
1 | {"c":16, "d":2} | | 8 | t
|
|
(1 row)
|
|
|
|
-- 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)
|
|
|