get_json_string
Description
Syntax:
VARCHAR get_json_string (VARCHAR json str, VARCHAR json path)
This function parses and fetches the strings 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_string('{"k1":"v1", "k2":"v2"}', "$.k1");
+---------------------------------------------------+
| get_json_string('{"k1":"v1", "k2":"v2"}', '$.k1') |
+---------------------------------------------------+
| v1 |
+---------------------------------------------------+- Get the second element of the array whose key is "my. key"
mysql> SELECT get_json_string('{"k1":"v1", "my.key":["e1", "e2", "e3"]}', '$."my.key"[1]');
+------------------------------------------------------------------------------+
| get_json_string('{"k1":"v1", "my.key":["e1", "e2", "e3"]}', '$."my.key"[1]') |
+------------------------------------------------------------------------------+
| e2 |
+------------------------------------------------------------------------------+- Get the first element in an array whose secondary path is k1. key - > K2
mysql> SELECT get_json_string('{"k1.key":{"k2":["v1", "v2"]}}', '$."k1.key".k2[0]');
+-----------------------------------------------------------------------+
| get_json_string('{"k1.key":{"k2":["v1", "v2"]}}', '$."k1.key".k2[0]') |
+-----------------------------------------------------------------------+
| v1 |
+-----------------------------------------------------------------------+- Get all the values in the array whose keys are "k1"
mysql> SELECT get_json_string('[{"k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v4"}]', '$.k1');
+---------------------------------------------------------------------------------+
| get_json_string('[{"k1":"v1"}, {"k2":"v2"}, {"k1":"v3"}, {"k1":"v4"}]', '$.k1') |
+---------------------------------------------------------------------------------+
| ["v1","v3","v4"] |
+---------------------------------------------------------------------------------+Keywords
GET_JSON_STRING,GET,JSON,STRING