JSON_EXISTS_PATH

Description

Used to determine whether the field specified by <path> exists in JSON data. Returns TRUE if it exists, FALSE if it does not exist.

Syntax

JSON_EXISTS_PATH (<json_object>, <path>)

Parameters

• <json_object> JSON type, determine whether the path specified by <path> exists in it.
• <path> String type, specifies the path.

Return Value

• BOOL type, returns TRUE if it exists, FALSE if it does not exist
• NULL: If either <json_object> or <path> is NULL, returns NULL.

Examples

1. Example 1
   SELECT JSON_EXISTS_PATH('{"id": 123, "name": "doris"}', '$.name');

   +------------------------------------------------------------+
   | JSON_EXISTS_PATH('{"id": 123, "name": "doris"}', '$.name') |
   +------------------------------------------------------------+
   |                                                          1 |
   +------------------------------------------------------------+

2. Example 2
   SELECT JSON_EXISTS_PATH('{"id": 123, "name": "doris"}', '$.age');

   +-----------------------------------------------------------+
   | JSON_EXISTS_PATH('{"id": 123, "name": "doris"}', '$.age') |
   +-----------------------------------------------------------+
   |                                                         0 |
   +-----------------------------------------------------------+

3. NULL parameters
   SELECT JSON_EXISTS_PATH('{"id": 123, "name": "doris"}', NULL);

   +--------------------------------------------------------+
   | JSON_EXISTS_PATH('{"id": 123, "name": "doris"}', NULL) |
   +--------------------------------------------------------+
   |                                                   NULL |
   +--------------------------------------------------------+

   SELECT JSON_EXISTS_PATH(NULL, '$.age');

   +---------------------------------+
   | JSON_EXISTS_PATH(NULL, '$.age') |
   +---------------------------------+
   |                            NULL |
   +---------------------------------+