I have a postgres query that uses the array_agg() function to return a PgArray of values. Running this query with a simple java.sql.PreparedStatement I get back a java.sql.ResultSet.
After val arrayCol = resultSet.getArray("array_agg_column_name") I have a java.sql.Array
printing arrayCol looks like
{1, 2, 3}
Calling arrayCol.getArray gives me an Object
I'm unsure of how to work with either of the Object or java.sql.Array types in my Scala code. Doing a simple asInstanceOf[List[Int]] fails with
java.lang.ClassCastException: [Ljava.lang.Integer; cannot be cast to scala.collection.immutable.List
While casing with asInstanceOf[Array[Int]] leads to
java.lang.ClassCastException: [Ljava.lang.Integer; cannot be cast to [I
If I import scala.collection.JavaConverters._
And then try using asScala I get
value asScala is not a member of Object
or " ... of java.sql.Array", depending if I call getArray.
What is the correct way to get parse a field resulting from a psql array_agg function?
I was able to use json_agg in lieu of array_agg in the postgres query, and then do:
resultSet.getString("array_agg_column_name")
From here, you can do as you like. We use Circe to decode Json to Scala objects.