语法：
JSON_CONTAINS(json_doc, val[, path])
案例：
select * from tb
where info->'$.name' = '特价促销' or JSON_CONTAINS(info->'$[*].name', '"特价促销"', '$')
SET @json = '{"A": 0, "B": {"C": 1}, "D": 2}';SELECT JSON_CONTAINS(@json, '2', '$.A');
+----------------------------------+
| JSON_CONTAINS(@json, '2', '$.A') |
+----------------------------------+
| 0 |
+----------------------------------+SELECT JSON_CONTAINS(@json, '2', '$.D');
+----------------------------------+
| JSON_CONTAINS(@json, '2', '$.D') |
+----------------------------------+
| 1 |
+----------------------------------+SELECT JSON_CONTAINS(@json, '{"C": 1}', '$.A');
+-----------------------------------------+
| JSON_CONTAINS(@json, '{"C": 1}', '$.A') |
+-----------------------------------------+
| 0 |
+-----------------------------------------+SELECT JSON_CONTAINS(@json, '{"C": 1}', '$.B');
+-----------------------------------------+
| JSON_CONTAINS(@json, '{"C": 1}', '$.B') |
+-----------------------------------------+
| 1 |
+-----------------------------------------+