get_json_int
Description
This function analyzes and gets the integer value from a specified path in json string.
json_path must start with $
and use .
as the path separator.
If the path includes .
, it could be circled by "
and "
.
[ ]
is used as the array subscripts which start from 0.
Content in the path should not contain "
, [
and ]
.
If the format of json_string or json_path is wrong, this function will return NULL.
Syntax
INT get_json_int(VARCHAR json_str, VARCHAR json_path)
Examples
-
Get the value whose key is "k1"
MySQL > SELECT get_json_int('{"k1":1, "k2":"2"}', "$.k1");
+--------------------------------------------+
| get_json_int('{"k1":1, "k2":"2"}', '$.k1') |
+--------------------------------------------+
| 1 |
+--------------------------------------------+ -
Get the second element in the array whose key is "my.key"
MySQL > SELECT get_json_int('{"k1":"v1", "my.key":[1, 2, 3]}', '$."my.key"[1]');
+------------------------------------------------------------------+
| get_json_int('{"k1":"v1", "my.key":[1, 2, 3]}', '$."my.key"[1]') |
+------------------------------------------------------------------+
| 2 |
+------------------------------------------------------------------+ -
Get the first element in the array whose path is k1.key -> k2.
MySQL > SELECT get_json_int('{"k1.key":{"k2":[1, 2]}}', '$."k1.key".k2[0]');
+--------------------------------------------------------------+
| get_json_int('{"k1.key":{"k2":[1, 2]}}', '$."k1.key".k2[0]') |
+--------------------------------------------------------------+
| 1 |
+--------------------------------------------------------------+
keyword
GET_JSON_INT,GET,JSON,INT