Update a String list column in Cassandra DB with Scala - scala

Question

I'm new on Cassandra and Scala, I'm working on a Kafka consumer (written in Scala) that has to update a field of a row on Cassandra from data it receives.
And so far no problem.
In this row a field is a String list and when I do the update this field hasn't to change, so I have to assign the same String list to it self.
UPDATE keyspaceName.tableName
SET fieldToChange = newValue
WHERE id = idValue
AND fieldA = '${currentRow.getString("fieldA")}'
AND fieldB = ${currentRow.getInt("fieldB")}
...
AND fieldX = ${currentRow.getList("fieldX", classOf[String]).toString}
...
But I receive even the exception:
com.datastax.driver.core.exceptions.SyntaxError: line 19:49 no viable alternative at input ']' (... 482 AND fieldX = [[listStringItem1]]...)
I currently haven't found anything that could help me through the web

Answer 1

The problem is that Scala's string representation of the list doesn't match to the Cassandra's representation of the list, so it generates errors.
Instead of constructing the CQL statement directly in your code, it's better to use PreparedStatement and bind variables to it:
first, it will speedup the execution as Cassandra won't parse every statement separately;
it will be easier to bind variables as you won't need to care about corresponding string representation
But be very careful with Scala - Java driver expects Java's lists, sets, maps, and base types, like, ints, etc.. You may look to java-driver-scala-extras package, but you'll need to compile it yourself, as it's not available on Maven Central.