@Override protected void doHealthCheck(Health.Builder builder) throws Exception { Select select = QueryBuilder.select("release_version").from("system", "local"); ResultSet results = this.cassandraOperations.getCqlOperations() .queryForResultSet(select); if (results.isExhausted()) { builder.up(); return; } String version = results.one().getString(0); builder.up().withDetail("version", version); }
@Override public Object execute(Statement statement, Class<?> type) { return operations.getCqlOperations().queryForResultSet(statement); } }
@Override public WriteResult execute() { if (executed.compareAndSet(false, true)) { return WriteResult.of(operations.getCqlOperations().queryForResultSet(batch)); } throw new IllegalStateException("This Cassandra Batch was already executed"); }
@Override public <T> Stream<T> stream(Statement statement, Class<T> entityClass) throws DataAccessException { Assert.notNull(statement, "Statement must not be null"); Assert.notNull(entityClass, "Entity type must not be null"); ResultSet resultSet = getCqlOperations().queryForResultSet(statement); return StreamSupport.stream(resultSet.spliterator(), false) .map(getMapper(entityClass, entityClass, QueryUtils.getTableName(statement))); }
@Override public Object execute(Statement statement, Class<?> type) { ResultSet resultSet = this.operations.getCqlOperations().queryForResultSet(statement); Iterator<Row> iterator = resultSet.iterator(); if (iterator.hasNext()) { Row row = iterator.next(); if (!iterator.hasNext() && ProjectionUtil.qualifiesAsCountProjection(row)) { Object object = row.getObject(0); return ((Number) object).longValue() > 0; } return true; } return false; } }
@Override public <T> Slice<T> slice(Statement statement, Class<T> entityClass) { Assert.notNull(statement, "Statement must not be null"); Assert.notNull(entityClass, "Entity type must not be null"); ResultSet resultSet = getCqlOperations().queryForResultSet(statement); Function<Row, T> mapper = getMapper(entityClass, entityClass, QueryUtils.getTableName(statement)); return QueryUtils.readSlice(resultSet, (row, rowNum) -> mapper.apply(row), 0, getEffectiveFetchSize(statement)); }
<T> Stream<T> doStream(Query query, Class<?> entityClass, CqlIdentifier tableName, Class<T> returnType) { RegularStatement statement = getStatementFactory().select(query, getRequiredPersistentEntity(entityClass), tableName); ResultSet resultSet = getCqlOperations().queryForResultSet(statement); return StreamSupport.stream(resultSet.spliterator(), false).map(getMapper(entityClass, returnType, tableName)); }
boolean doExists(Query query, Class<?> entityClass, CqlIdentifier tableName) { RegularStatement select = getStatementFactory().select(query.limit(1), getRequiredPersistentEntity(entityClass), tableName); return getCqlOperations().queryForResultSet(select).iterator().hasNext(); }
@Override public boolean exists(Object id, Class<?> entityClass) { Assert.notNull(id, "Id must not be null"); Assert.notNull(entityClass, "Entity type must not be null"); CassandraPersistentEntity<?> entity = getRequiredPersistentEntity(entityClass); Select select = QueryBuilder.select().from(getTableName(entityClass).toCql()); getConverter().write(id, select.where(), entity); return getCqlOperations().queryForResultSet(select).iterator().hasNext(); }