Question

我正在运行Cassandra 1.2.0（CQL3），而我正在使用Hector 1.0.5。这是我的表定义：

CREATE TABLE group_profiles (
    profile_id text,
    time timeuuid,
    document text,
    PRMARY KEY (profile_id, time)
) WITH COMPACT STORAGE;

我无法弄清楚如何连接到cassandra集群并创建一行。在CQL3的情况下，Hector的文档遍布整个地方或不完整。我似乎无法找到使用现有表连接到现有键空间并使用CQL3添加记录的完整示例。

更新

经过多次挖掘和诅咒后，我发现了这个示例项目using the cassandra driver core。我会玩它，但这更像是我的想法。目前它刚刚进入beta2，但由于这仅仅是为了个人学习，我会给它一个镜头，看看它是怎么回事。

Answer 1

您可以按照this和this链接开始使用Hector API。

Answer 2

这就是我连接部分（我使用spring / maven）的方式：

<{1>}中的

：

data-access.properties

jdbc.driverClassName=org.apache.cassandra.cql.jdbc.CassandraDriver jdbc.url=jdbc:cassandra://localhost:9160/mykeyspace # not sure if userName and Passwords are really usefull, haven't tested, I should though, I will ... Just did ... No real impact with my cassandra configuration jdbc.username=IamG jdbc.password=root # Properties that control the population of schema and data for a new data source jdbc.initLocation=classpath:db/cassandra/initDB.cql jdbc.dataLocation=classpath:db/cassandra/populateDB.cql jpa.showSql=true

data-Source-config.xml

然后用这个班级做了我所有的时间 - wimey wibbeley-wobbeley恶作剧

<bean id="dataSource"
    class="org.apache.tomcat.jdbc.pool.DataSource"
    p:driverClassName="${jdbc.driverClassName}"
    p:url="${jdbc.url}"
    p:username="${jdbc.username}"
    p:password="${jdbc.password}"/>

<!-- Database initializer. If any of the script fails, the initialization stops. -->
<!-- As an alternative, for embedded databases see <jdbc:embedded-database/>. -->
<jdbc:initialize-database data-source="dataSource">
    <jdbc:script location="${jdbc.initLocation}"/>
    <jdbc:script location="${jdbc.dataLocation}"/>
</jdbc:initialize-database>

<bean id="keySpaceManager"
    class="org.me.cassandra.persistence.KeyspaceManagerImpl"
    p:dataSource-ref="dataSource" />

我在import me.prettyprint.hector.api.Cluster; import me.prettyprint.hector.api.Keyspace; import me.prettyprint.hector.api.factory.HFactory; import org.apache.cassandra.cql.jdbc.UtilsProxy; import org.apache.tomcat.jdbc.pool.DataSourceProxy; public class KeyspaceManagerImpl implements KeyspaceManager { private DataSourceProxy dataSource; @Override public void setDataSource(DataSourceProxy dataSource) { this.dataSource = dataSource; } @Override public Cluster getCluster() { String hostName = getHostName(); String clusterName = "arbitraryClusterNameProbablyShouldBeSetInConfig.xml"; return HFactory.getOrCreateCluster(clusterName, hostName); } @Override public Keyspace getKeyspace() { String databaseName = getDatabaseName(); Cluster cluster = getCluster(); return HFactory.createKeyspace(databaseName, cluster); } private String getHostName() { return getConnectionProperties().getProperty(UtilsProxy.TAG_SERVER_NAME); } private String getDatabaseName() { return getConnectionProperties().getProperty(UtilsProxy.TAG_DATABASE_NAME); } private Properties getConnectionProperties() { return UtilsProxy.getConnectionProperties(dataSource); } } // and this other class that was needed to proxy some very interesting but not visible (package visible) one package org.apache.cassandra.cql.jdbc; // <- package is very important here ! import java.sql.SQLException; import java.util.HashMap; import java.util.Map; import java.util.Properties; import org.apache.tomcat.jdbc.pool.DataSourceProxy; import org.apache.tomcat.jdbc.pool.PoolConfiguration; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * This class proxies an utility class that has been declared as "Package visible" * * Some utility methods were added (1 so far when this javadoc was written) * * @author gulhe * */ public class UtilsProxy extends Utils { private static final Logger log = LoggerFactory.getLogger(UtilsProxy.class); private static final Map<String, Properties> urlParseStore = new HashMap<>(); /** * Gets cassandra connection properties from a dataSourceProxy * The information used will be the full connectionUrl. * Said URL will then be parsed. * * To avoid reparsing the same string multiple times, results are stored by their url String. * * @return a java.util.Properties holding Cassandra connection info */ public static Properties getConnectionProperties(DataSourceProxy dataSource) { PoolConfiguration poolProperties = dataSource.getPoolProperties(); String url = poolProperties.getUrl(); Properties alreadyStoredProperties = urlParseStore.get(url); if (alreadyStoredProperties != null) { return alreadyStoredProperties; } try { Properties urlParsedConnectionProperties = Utils.parseURL(url); urlParseStore.put(url, urlParsedConnectionProperties); return urlParsedConnectionProperties; } catch (SQLException e) { log.error("Something went wrong !", e); } return new Properties(); } }（以及其他内容）中使用过：

pom.xml

查询部分，......我还在努力解决它：（（见：https://stackoverflow.com/questions/26484525/in-cassandra-i-cant-seem-to-get-column-by-composite-name-with-hector-api）

（我可能一如既往地忘记了事情，不要犹豫告诉我，我会补充一些缺失的东西）

在Java中使用Hector和CQL3

2 个答案: