get_json_double
Description
Syntax:
DOUBLE get_json_double(VARCHAR json_str, VARCHAR json_path)
This function parses and fetches the floating points of the specified path in the JSON string. json_path must start with the $ symbol and use . as the path splitter. If the path contains ., you may put the path in double quotation marks. Please use [] to denote array subscripts (starting from 0). The path itself may not contain double quotation marks, comma, and square brackets. If the json_string or json_path is in the wrong format, or if the specified item cannot be found, the function will return NULL.
Example
- Get the value whose key is "k1"
mysql> SELECT get_json_double('{"k1":1.3, "k2":"2"}', "$.k1");
+-------------------------------------------------+
| get_json_double('{"k1":1.3, "k2":"2"}', '$.k1') |
+-------------------------------------------------+
| 1.3 |
+-------------------------------------------------+- Get the second element of the array whose key is "my. key"
mysql> SELECT get_json_double('{"k1":"v1", "my.key":[1.1, 2.2, 3.3]}', '$."my.key"[1]');
+---------------------------------------------------------------------------+
| get_json_double('{"k1":"v1", "my.key":[1.1, 2.2, 3.3]}', '$."my.key"[1]') |
+---------------------------------------------------------------------------+
| 2.2 |
+---------------------------------------------------------------------------+- Get the first element in an array whose secondary path is k1. key - > K2
mysql> SELECT get_json_double('{"k1.key":{"k2":[1.1, 2.2]}}', '$."k1.key".k2[0]');
+---------------------------------------------------------------------+
| get_json_double('{"k1.key":{"k2":[1.1, 2.2]}}', '$."k1.key".k2[0]') |
+---------------------------------------------------------------------+
| 1.1 |
+---------------------------------------------------------------------+Keywords
GET_JSON_DOUBLE,GET,JSON,DOUBLE