在 Postgres 的 varchar 数组和枚举的 Java/Kotlin 集合之间的 Hibernate 映射

Question

Basically everything is in the title.

I have a column in my DB which is a varchar[] .

I really would like to map it to a Java/Kotlin enum . We've already got this working to fetch it as a list of String s (through com.vladmihalcea:hibernate-types and StringArrayType ), but not with a mapping to an enum. Do you know if this is possible?

Since we know how to map a varchar to an enum , and a varchar[] to a collection of String , I would be tempted to think that this should possible, but I didn't succeed yet.

Here would be a simple sample of my current configuration:

CREATE TABLE test(my_values varchar[]) ;
INSERT INTO test(my_values) values ('{VAL1, VAL2}')

@Entity
@Table(name = "test")
data class DbTest(
        @Column(name = "my_values")
        val myValues: List<Values>
)

enum class Values {
       VAL1, VAL2
}

I tried this: https://vladmihalcea.com/map-postgresql-enum-array-jpa-entity-property-hibernate/ which looks pretty good but you have to define the enum in the DB and we don't want that.

Thanks!

Answer 1

I'm posting my solution, I didn't succeed to get a List<Values> , although I got an Array<Values> which was fine with me.

@Entity
@Table(name = "test")
@TypeDef(
        name = "values-array",
        typeClass = EnumArrayType::class,
        defaultForType = Array<Values>::class,
        parameters = [
          Parameter(
                  name = EnumArrayType.SQL_ARRAY_TYPE,
                  value = "varchar"
          )
        ]
)
data class DbTest(
        @Type(type = "values-array")
        @Column(name = "my_values", columnDefinition = "varchar[]")
        val myValues: Array<Values>
)

enum class Values {
       VAL1, VAL2
}

This is working like a charm and I can map my array to a list and vice versa quite easily, which is ok.

Hoping this will help someone someday ;)