The Ultimate Guide to High Availability with MariaDB

JSON Data Type

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MariaDB starting with 10.2.7

The JSON alias was added in MariaDB 10.2.7.

JSON is an alias for LONGTEXT introduced for compatibility reasons with MySQL's JSON data type. MariaDB implements this as a LONGTEXT rather, as the JSON data type contradicts the SQL standard, and MariaDB's benchmarks indicate that performance is at least equivalent.

In order to ensure that a a valid json document is inserted, the JSON_VALID function can be used as a CHECK constraint.

Examples

CREATE TABLE t (j JSON);

DESC t;
+-------+----------+------+-----+---------+-------+
| Field | Type     | Null | Key | Default | Extra |
+-------+----------+------+-----+---------+-------+
| j     | longtext | YES  |     | NULL    |       |
+-------+----------+------+-----+---------+-------+

With validation:

CREATE TABLE t2 (
  j JSON 
  CHECK (JSON_VALID(j))
);

INSERT INTO t2 VALUES ('invalid');
ERROR 4025 (23000): CONSTRAINT `j` failed for `test`.`t2`

INSERT INTO t2 VALUES ('{"id": 1, "name": "Monty"}');
Query OK, 1 row affected (0.13 sec)

See also

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