Question

The keyspace and 'person' table are exist

您好，我是Cassandra的新手，所以我只是尝试从我的java代码执行select查询，但我得到一个例外，表不存在（但它存在。检查上面的链接）。请帮我弄清楚这个问题可能是什么原因。提前谢谢。

public class DS_Cassandra implements DS 
{
    Cluster cluster;
    Session session;
    private static final Logger log = Logger.getLogger( DS_Cassandra.class.getName() );

    public DS_Cassandra() 
    {
        cluster = Cluster.builder().addContactPoint("127.0.0.1").build();
        session = cluster.connect("testing");
    }

    @Override
    public ArrayList<Person> read() 
    {
        ArrayList<Person> list = new ArrayList<Person>();
        ResultSet results = session.execute("SELECT * FROM person"); //and here exception happened



2016-03-02 22:06:26 INFO  NettyUtil:83 - Did not find Netty's native epoll transport in the classpath, defaulting to NIO.
2016-03-02 22:06:26 INFO  DCAwareRoundRobinPolicy:95 - Using data-center name 'datacenter1' for DCAwareRoundRobinPolicy (if this is incorrect, please provide the correct datacenter name with DCAwareRoundRobinPolicy constructor)
2016-03-02 22:06:26 INFO  Cluster:1475 - New Cassandra host /127.0.0.1:9042 added
Exception in thread "main" com.datastax.driver.core.exceptions.InvalidQueryException: unconfigured table person
    at com.datastax.driver.core.exceptions.InvalidQueryException.copy(InvalidQueryException.java:50)
    at com.datastax.driver.core.DriverThrowables.propagateCause(DriverThrowables.java:37)
    at com.datastax.driver.core.DefaultResultSetFuture.getUninterruptibly(DefaultResultSetFuture.java:245)
    at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:63)
    at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:39)...

Answer 1

表名称区分大小写。

Answer 2

尝试将您的键空间名称与表名称相加。

对于您的情况：“ SELECT * FROM my_keyspace_name.person”

Cassandra DB。 com.datastax.driver.core.exceptions.InvalidQueryException：未配置的表人员

2 个答案: