Java driver clustering key

See Java-Driver-Rows-vs-Columns for more info on how clustering keys work and what rows and columns look like at the storage level vs CQL3.

Consider this schema.

And say that this is the data that we want to insert and query.

Here are some examples on how to write Astyanax queries for this use case.

Create table

ColumnFamily<Integer, Integer> CF_CLUSTERING_KEY = 
	new ColumnFamily<Integer, Integer>("cf",
					IntegerSerializer.get(),
				        IntegerSerializer.get(),
					StringSerializer.get());
	
keyspace.createColumnFamily(CF_CLUSTERING_KEY, null);

Insert Rows

MutationBatch m = keyspace.prepareMutationBatch();
// 1st row
m.withRow(CF_CLUSTERING_KEY, 1).putColumn(1, "a1").putColumn(2, "a2").putColumn(3, "a3");
m.withRow(CF_CLUSTERING_KEY, 1).putColumn(4, "a4").putColumn(5, "a5");
// 2nd row
m.withRow(CF_CLUSTERING_KEY, 2).putColumn(1, "b1").putColumn(2, "b2");
	
m.execute();

Single Row Query

ColumnList<Integer> columns = 
keyspace.prepareQuery(CF_CLUSTERING_KEY).getRow(1).execute().getResult();

for (Column<Integer> col : columns) {
	System.out.println(col.getName() + " " + col.getStringValue());
}

Single Row Query With Column Slice

columns = keyspace.prepareQuery(CF_CLUSTERING_KEY)
		.getRow(1)
		.withColumnSlice(1,3,5)
		.execute().getResult();
		
for (Column<Integer> col : columns) {
	System.out.println(col.getName() + " " + col.getStringValue());
}

Single Row Query With Column Range Specification

columns = keyspace.prepareQuery(CF_CLUSTERING_KEY)
		.getRow(1)
		.withColumnRange(2, 5, false, 10)
		.execute().getResult();
				
for (Column<Integer> col : columns) {
	System.out.println(col.getName() + " " + col.getStringValue());
}

Single Row Query and Single Column

Column<Integer> col = keyspace.prepareQuery(CF_CLUSTERING_KEY)
		.getRow(1)
		.getColumn(4)
		.execute().getResult();
System.out.println(col.getName() + " " + col.getStringValue());

Row Slice Query Using Row Keys

Rows<Integer, Integer> rows = keyspace.prepareQuery(CF_CLUSTERING_KEY)
		.getRowSlice(1,2)
		.execute().getResult();
		
for (Row<Integer, Integer> row : rows) {
	System.out.println("Row key: " + row.getKey());
	ColumnList<Integer> cols = row.getColumns();
	for (Column<Integer> col : cols) {
		System.out.println(col.getName() + " " + col.getStringValue());
	}
}

Row Slice Query Using Column Range Specification

rows = keyspace.prepareQuery(CF_CLUSTERING_KEY)
		.getRowSlice(1,2)
		.withColumnRange(2, 5, false, 10)
		.execute().getResult();