get_json_bool

Description

Parses and gets the boolean value from a specified JSON path in a JSON string.

If the format of json_str or json_path is invalid, or if no matching content can be found, this function will return NULL.

This function is supported from v3.3.

Syntax

BOOLEAN get_json_bool(VARCHAR json_str, VARCHAR json_path)

Parameters

• json_str: the JSON string. The supported data type is VARCHAR.

• json_path: the JSON path. The supported data type is VARCHAR.

  • json_path must start with $ and use . as the path separator. If the path includes ., it can be enclosed in a pair of ".
  • [ ] is used as the array subscripts which starts from 0.

Examples

1. Get the value whose key is "k1". The value is true and 1 is returned.

   MySQL > SELECT get_json_bool('{"k1":true, "k2":"false"}', "$.k1");
   +----------------------------------------------------+
   | get_json_bool('{"k1":true, "k2":"false"}', '$.k1') |
   +----------------------------------------------------+
   |                                                  1 |
   +----------------------------------------------------+

2. Get the second element in the array whose key is "my.key". The second element is false and 0 is returned.

   SELECT get_json_bool('{"k1":"v1", "my.key":[true, false, 3]}', '$."my.key"[1]');
   +--------------------------------------------------------------------------+
   | get_json_bool('{"k1":"v1", "my.key":[true, false, 3]}', '$."my.key"[1]') |
   +--------------------------------------------------------------------------+
   |                                                                        0 |
   +--------------------------------------------------------------------------+

3. Get the first element in the array whose path is k1.key -> k2. The first element is false and 0 is returned.

   MYSQL > SELECT get_json_bool('{"k1.key":{"k2":[false, true]}}', '$."k1.key".k2[0]');
   +----------------------------------------------------------------------+
   | get_json_bool('{"k1.key":{"k2":[false, true]}}', '$."k1.key".k2[0]') |
   +----------------------------------------------------------------------+
   |                                                                    0 |
   +----------------------------------------------------------------------+

keyword

GET_JSON_BOOL,GET,JSON,BOOL