mysql8.0JSON_ Instructions for using contains

Catalog

JSON_CONTAINS Use

grammar

Case study

JSON_CONTAINS Function problem

The structure is as follows

JSON_CONTAINS Use grammar JSON_CONTAINS(json_doc, val[, path]) Case study select * from tb    where info->'$.name' = ' Special promotion '  or JSON_CONTAINS(info->'$[*].name', '" Special promotion "', '$')SET @json = '{"A": 0, "B": {"C": 1}, "D": 2}';SELECT JSON_CONTAINS(@json, '2', '$.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 |+-----------------------------------------+JSON_CONTAINS Function problem

mysql Deposit is [14,15] This data structure Solution to query

The structure is as follows

Students ：

@Column(value = "subject_ids", type = MySqlTypeConstant.TEXT)@ColumnComment(value = " subject . You can choose more , The format is as follows [1,2,3]")private List<Long> subjectIds;

Database type ：text

mysql Storage type ： [14,15]

At this time, according to the subject ID Check which students have chosen 14 You can't use this subject when you have to in This grammar

It can be used at this time

SELECT * FROM `t_student` where  JSON_CONTAINS(subject_ids, '14')

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