Examples of com.datastax.driver.core.ResultSet

com.datastax.driver.core.ResultSet
The result of a query.
The retrieval of the rows of a ResultSet is generally paged (a first page of result is fetched and the next one is only fetched once all the results of the first one has been consumed). The size of the pages can be configured either globally through {@link QueryOptions#setFetchSize} or per-statementwith {@link Statement#setFetchSize}. Though new pages are automatically (and transparently) fetched when needed, it is possible to force the retrieval of the next page early through {@link #fetchMoreResults}. Please note however that this ResultSet paging is not available with the version 1 of the native protocol (i.e. with Cassandra 1.2 or if version 1 has been explicitly requested through {@link Cluster.Builder#withProtocolVersion}). If the protocol version 1 is in use, a ResultSet is always fetched in it's entirely and it's up to the client to make sure that no query can yield ResultSet that won't hold in memory.
Note that this class is not thread-safe.

   * @return Value of the counter.
   */
  private long readSchemaIdCounter() {
    // Sanity check that counter value is 1!
    String queryText = String.format("SELECT * FROM %s;", mCounterTable);
    ResultSet resultSet = mAdmin.execute(queryText);
    List<Row> rows = resultSet.all();
    assert(rows.size() == 1);
    Row row = rows.get(0);
    return row.getLong(SCHEMA_COUNTER_COLUMN_VALUE);
  }

View Full Code Here

    // TODO: Obviate this comment by doing all of this in batch.
    // Writes the ID mapping first: if the hash table write fails, we just lost one schema ID.
    // The hash table write must not happen before the ID table write has been persisted.
    // Otherwise, another client may see the hash entry, write cells with the schema ID that cannot
    // be decoded (since the ID mapping has not been written yet).
    final ResultSet resultSet = mAdmin.execute(
        mPreparedStatementWriteIdTable.bind(
            avroEntry.getId(),
            new Date(timestamp),
            ByteBuffer.wrap(entryBytes))
    );
    Preconditions.checkNotNull(resultSet);


    // TODO: Anything here to flush the table or verify that this worked?
    //if (flush) { mSchemaIdTable.flushCommits(); }


    final ResultSet hashResultSet =
        mAdmin.execute(
            mPreparedStatementWriteHashTable.bind(
                ByteBuffer.wrap(avroEntry.getHash().bytes()),
                new Date(timestamp),
                ByteBuffer.wrap(entryBytes))

View Full Code Here

        SCHEMA_COLUMN_VALUE,
        tableName,
        SCHEMA_COLUMN_ID_KEY,
        schemaId,
        SCHEMA_COLUMN_TIME);
    final ResultSet resultSet = mAdmin.execute(queryText);
    final List<Row> rows = resultSet.all();


    if (0 == rows.size()) {
      return null;
    }

View Full Code Here

   * @return Avro schema entry, or null if the schema hash does not exist in the table
   * @throws java.io.IOException on I/O error.
   */
  private SchemaTableEntry loadFromHashTable(BytesKey schemaHash) throws IOException {
    final ByteBuffer tableKey = ByteBuffer.wrap(schemaHash.getBytes());
    final ResultSet resultSet = mAdmin.execute(mPreparedStatementReadHashTable.bind(tableKey));


    final List<Row> rows = resultSet.all();


    if (0 == rows.size()) {
      return null;
    }

View Full Code Here

    admin.execute(updateQuery);


    // TODO: check if below is necessary, or leftover
    // Sanity check that counter value is 1!
    final String selectQuery = String.format("SELECT * FROM %s;", tableName);
    final ResultSet resultSet = admin.execute(selectQuery);
    final List<Row> rows = resultSet.all();
    assert(rows.size() == 1);
    final Row row = rows.get(0);
    final long counterValue = row.getLong(SCHEMA_COUNTER_COLUMN_VALUE);
    assert(0 == counterValue);
  }

View Full Code Here

    final Set<SchemaEntry> entries = new HashSet<SchemaEntry>();
    int hashTableRowCounter = 0;


    // Fetch all of the schemas from the schema hash table (all versions)
    final String queryText = String.format("SELECT * FROM %s;", mSchemaHashTable);
    final ResultSet resultSet = mAdmin.execute(queryText);


    for (Row row : resultSet) {
      hashTableRowCounter += 1;


      // TODO: Not sure how to replicate this check in C*...

View Full Code Here

    int idTableRowCounter = 0;
    final Set<SchemaEntry> entries = new HashSet<SchemaEntry>();


    // Fetch all of the schemas from the schema ID table (all versions)
    final String queryText = String.format("SELECT * FROM %s;", mSchemaIdTable);
    final ResultSet resultSet = mAdmin.execute(queryText);


    for (Row row : resultSet) {
      idTableRowCounter += 1;


      // Get the row key, timestamp, and schema for this row.  Use "Unsafe" version of method here

View Full Code Here

    LOG.info(String.format("Creating keyspace %s (if missing) for %s.", keyspace, kijiURI));


    // TODO: Check whether keyspace is > 48 characters long and if so provide Kiji error to user.
    String queryText = "CREATE KEYSPACE IF NOT EXISTS " + keyspace
        + " WITH REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor': 1}";
    ResultSet resultSet = getSession().execute(queryText);
    LOG.info(resultSet.toString());
    getSession().execute(String.format("USE %s", keyspace));


    // Check that the keyspace actually exists!
    assert(keyspaceExists(keyspace));

View Full Code Here

  public List<String> listTables() throws IOException {
    Preconditions.checkNotNull(mListTablesStatement);




    // Just return a set of in-use tables
    ResultSet resultSet = mAdmin.execute(mListTablesStatement.bind());
    Set<String> keys = new HashSet<String>();


    // This code makes me miss Scala
    for (Row row: resultSet.all()) {
      keys.add(row.getString(QUALIFIER_TABLE));
    }


    List<String> list = new ArrayList<String>();
    list.addAll(keys);

View Full Code Here

  @Override
  public byte[] getValue(String key) throws IOException {
    final State state = mState.get();
    Preconditions.checkState(state == State.OPEN,
        "Cannot get value from SystemTable instance in state %s.", state);
    ResultSet resultSet = mAdmin.execute(mPreparedStatementGetValue.bind(key));


    // Extra the value from the byte buffer, otherwise return this empty buffer
    // TODO: Some additional sanity checks here?
    List<Row> rows = resultSet.all();
    Preconditions.checkArgument(
        rows.size() <= 1, "Expected to get 0 or 1 rows from system table, but got %s.", rows);
    if (rows.size() == 1) {
      Row row = rows.get(0);
      return ByteUtils.toBytes(row.getBytes(VALUE_COLUMN));

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of com.datastax.driver.core.ResultSet

ch.uzh.ifi.ddis.ifp.esper.cassandra.CassandraVirtualDataWindow

ch.uzh.ifi.ddis.ifp.esper.cassandra.CassandraVirtualDataWindowLookup

com.alvazan.orm.layer9z.spi.db.cassandracql3.CqlSession

com.alvazan.orm.layer9z.spi.db.cassandracql3.CursorColumnSliceCql

com.alvazan.orm.layer9z.spi.db.cassandracql3.CursorKeysToRowsCql3

com.alvazan.orm.layer9z.spi.db.cassandracql3.CursorOfFutures

com.alvazan.orm.layer9z.spi.db.cassandracql3.CursorOfIndexes

com.cloudwick.cassandra.yelp.SimpleClient

com.ebuddy.cassandra.cql.dao.CqlStructuredDataSupport

com.impetus.kundera.client.cassandra.dsdriver.DSClient

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.