MySQL JSON type Value search with SpringBoot + Spring JPA

Overview

I investigated the Value value search of JSON type column using JPA, so as a share. Case to search by Specification.

Conclusion

Use MySQL functions.

JSON_EXTRACT

SELECT * FROM ATABLE WHERE JSON_EXTRACT("column_name", "$.key") = value;

So, when using Spring JPA Specification,

public Specification<T> jsonSearch(String key, String val) {
	return  (root, query, cb) -> {
	    return cb.like(cb.function("JSON_EXTRACT", String.class, root.get("names"), cb.literal("$." + key)),
		    "%" + val + "%");
	};
}

reference

Custom expression in JPA CriteriaBuilder