jhnmora000 commented on a change in pull request #156: GORA 411 - Add
exists(key) to DataStore interface
URL: https://github.com/apache/gora/pull/156#discussion_r280293088
##########
File path:
gora-cassandra/src/main/java/org/apache/gora/cassandra/serializers/AvroSerializer.java
##########
@@ -466,4 +466,25 @@ public Result execute(DataStore dataStore, Query query)
throws GoraException {
}
}
+ @Override
+ public boolean exists(Object key) throws GoraException {
+ try {
+ ArrayList<String> cassandraKeys = new ArrayList<>();
+ ArrayList<Object> cassandraValues = new ArrayList<>();
+ AvroCassandraUtils.processKeys(mapping, key, cassandraKeys,
cassandraValues);
+ String cqlQuery = CassandraQueryFactory.getCheckExistsQuery(mapping,
cassandraKeys);
+ SimpleStatement statement = new SimpleStatement(cqlQuery,
cassandraValues.toArray());
+ if (readConsistencyLevel != null) {
+
statement.setConsistencyLevel(ConsistencyLevel.valueOf(readConsistencyLevel));
+ }
+ ResultSet resultSet = client.getSession().execute(statement);
+ Iterator<Row> iterator = resultSet.iterator();
+ Row next = iterator.next();
+ long aInt = next.getLong(0);
Review comment:
Hi Kevin. To be frank with you I am not an expert in Cassandra so I based
this implementation on this stackoverflow
[response](https://stackoverflow.com/a/34475402) . I will try the approach you
mention and report back to you.
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