json_parse

json_parse

description

Syntax

JSON json_parse(VARCHAR json_str)
JSON json_parse_error_to_null(VARCHAR json_str)
JSON json_parse_error_to_value(VARCHAR json_str, VARCHAR default_json_str)

json_parse functions parse JSON string to binary format. A series of functions are provided to satisfy different demand for exception handling.

• all return NULL if json_str is NULL
• if json_str is not valid
  • json_parse will report error
  • json_parse_error_to_null will return NULL
  • json_parse_error_to_value will return the value specified by default_json_str

example

1. parse valid JSON string

mysql> SELECT json_parse('{"k1":"v31","k2":300}');
+--------------------------------------+
| json_parse('{"k1":"v31","k2":300}') |
+--------------------------------------+
| {"k1":"v31","k2":300}                |
+--------------------------------------+
1 row in set (0.01 sec)

2. parse invalid JSON string

mysql> SELECT json_parse('invalid json');
ERROR 1105 (HY000): errCode = 2, detailMessage = json parse error: Invalid document: document must be an object or an array for value: invalid json

mysql> SELECT json_parse_error_to_null('invalid json');
+-------------------------------------------+
| json_parse_error_to_null('invalid json') |
+-------------------------------------------+
| NULL                                      |
+-------------------------------------------+
1 row in set (0.01 sec)

mysql> SELECT json_parse_error_to_value('invalid json', '{}');
+--------------------------------------------------+
| json_parse_error_to_value('invalid json', '{}') |
+--------------------------------------------------+
| {}                                               |
+--------------------------------------------------+
1 row in set (0.00 sec)

refer to json tutorial for more.

keywords

JSONB, JSON, json_parse, json_parse_error_to_null, json_parse_error_to_value