How to register non-standarized SQL functions manually in Spring Boot application?

Question

I\'m using JPA query in my current spring-boot project. How can I add non-standardized SQL functions like GROUP_CONCAT?

Prior, to my previo

Answer 1

Create a class and add mySql Function you need to use in the overridden method:

public class SqlFunctionsMetadataBuilderContributor implements MetadataBuilderContributor{

 @Override
    public void contribute(MetadataBuilder metadataBuilder) {
        metadataBuilder.applySqlFunction(
            "group_concat",
            new StandardSQLFunction(
                "group_concat",
                StandardBasicTypes.STRING
            )
        );
    }
}

After that, provide your metadata_builder_contributor via application.properties:

spring.jpa.properties.hibernate.metadata_builder_contributor = qualifiedClassName