JSON_KEY_VALUE

MariaDB starting with 11.2

JSON_KEY_VALUE was added in MariaDB 11.2.

Syntax

JSON_KEY_VALUE(obj, json_path)

Description

JSON_KEY_VALUE extracts key/value pairs from a JSON object. The JSON path parameter is used to only return key/value pairs for matching JSON objects.

Example

SELECT JSON_KEY_VALUE('[[1, {"key1":"val1", "key2":"val2"}, 3], 2, 3]', '$[0][1]');
+-----------------------------------------------------------------------------+
| JSON_KEY_VALUE('[[1, {"key1":"val1", "key2":"val2"}, 3], 2, 3]', '$[0][1]') |
+-----------------------------------------------------------------------------+
| [{"key": "key1", "value": "val1"}, {"key": "key2", "value": "val2"}]        |
+-----------------------------------------------------------------------------+

JSON_KEY_VALUE() can be used as an argument to JSON_TABLE(), which allows adding the key to a result set.

SELECT jt.* FROM JSON_TABLE(
JSON_KEY_VALUE('[[1, {"key1":"val1", "key2":"val2"}, 3], 2, 3]', '$[0][1]'),'$[*]'
COLUMNS (
k VARCHAR(20) PATH '$.key',
v VARCHAR(20) PATH '$.value',
id FOR ORDINALITY )) AS jt;
+------+------+------+
| k    | v    | id   |
+------+------+------+
| key1 | val1 |    1 |
| key2 | val2 |    2 |
+------+------+------+

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