Cassandra的PHP客户端的更多选择---Cassandra-PHP-Client-Library

接上例：http://blog.csdn.net/kunshan_shenbin/article/details/7194979

本文将讲述更对强大的Cassandra-PHP-Client-Library

官方主页：https://github.com/kallaspriit/Cassandra-PHP-Client-Library

代码来自官网：https://github.com/kallaspriit/Cassandra-PHP-Client-Library/blob/master/example.php

<?php// show all the errorserror_reporting(E_ALL);// the only file that needs including into your projectrequire_once 'Cassandra.php';// list of seed servers to randomly connect to// all the parameters are optional and default to given values$servers = array(array('host' => '127.0.0.1','port' => 9160,'use-framed-transport' => true,'send-timeout-ms' => 1000,'receive-timeout-ms' => 1000));// create a named singleton, the second parameter name defaults to "main"// you can have several named singletons with different server pools$cassandra = Cassandra::createInstance($servers);// at any point in code, you can get the named singleton instance, the name// again defaults to "main" so no need to define it if using single instance$cassandra2 = Cassandra::getInstance();// drop the example keyspace and ignore errors should it not existtry {$cassandra->dropKeyspace('CassandraExample');} catch (Exception $e) {}// create a new keyspace, accepts extra parameters for replication options// normally you don't do it every time$cassandra->createKeyspace('CassandraExample');// start using the created keyspace$cassandra->useKeyspace('CassandraExample');// if a request fails, it will be retried for this many times, each time backing// down for a bit longer period to prevent floods; defaults to 5$cassandra->setMaxCallRetries(5);// create a standard column family with given column metadata$cassandra->createStandardColumnFamily('CassandraExample', // keyspace name'user',             // the column-family namearray(              // list of columns with metadataarray('name' => 'name','type' => Cassandra::TYPE_UTF8,'index-type' => Cassandra::INDEX_KEYS, // create secondary index'index-name' => 'NameIdx'),array('name' => 'email','type' => Cassandra::TYPE_UTF8),array('name' => 'age','type' => Cassandra::TYPE_INTEGER,'index-type' => Cassandra::INDEX_KEYS,'index-name' => 'AgeIdx'))// actually accepts more parameters with reasonable defaults);// create a super column family$cassandra->createSuperColumnFamily('CassandraExample','cities',array(array('name' => 'population','type' => Cassandra::TYPE_INTEGER),array('name' => 'comment','type' => Cassandra::TYPE_UTF8)),// see the definition for these additional optional parametersCassandra::TYPE_UTF8,Cassandra::TYPE_UTF8,Cassandra::TYPE_UTF8,'Capitals supercolumn test',1000,1000,0.5);// lets fetch and display the schema of created keyspace$schema = $cassandra->getKeyspaceSchema('CassandraExample');echo 'Schema: <pre>'.print_r($schema, true).'</pre><hr/>';/*// should we need to, we can access the low-level client directly$version = $cassandra->getConnection()->getClient()->describe_version();echo 'Version directly: <pre>'.print_r($version, true).'</pre><hr/>';*/// if implemented, use the wrapped methods as these are smarter - can retry etc$version = $cassandra->getVersion();echo 'Version through wrapper: <pre>'.print_r($version, true).'</pre><hr/>';// cluster is a pool of connections$cluster = $cassandra->getCluster();echo 'Cluster: <pre>'.print_r($cluster, true).'</pre><hr/>';// you can ask the cluster for a connection to a random seed server from pool$connection = $cluster->getConnection();echo 'Connection: <pre>'.print_r($connection, true).'</pre><hr/>';// access column family, using the singleton syntax// there is shorter "cf" methid that is an alias to "columnFamily"$userColumnFamily = Cassandra::getInstance()->columnFamily('user');echo 'Column family "user": <pre>'.print_r($userColumnFamily, true).'</pre><hr/>';// lets insert some test data using the convinience method "set" of Cassandra// the syntax is COLUMN_FAMILY_NAME.KEY_NAME$cassandra->set('user.john',array('email' => '[e-mail]','name' => 'John Smith','age' => 34));// when inserting data, it's ok if key name contains ".", no need to escape them$cassandra->set('user.jane.doe',array('email' => '[e-mail]','name' => 'Jane Doe','age' => 24));// longer way of inserting data, first getting the column family$cassandra->cf('user')->set('chuck', // key namearray(   // column names and values'email' => '[e-mail]','name' => 'Chuck Norris','age' => 24),Cassandra::CONSISTENCY_QUORUM // optional consistency to use// also accepts optional custom timestamp and time to live);// lets fetch all the information about user john$john = $cassandra->get('user.john');echo 'User "john": <pre>'.print_r($john, true).'</pre><hr/>';// since the jane key "jane.doe" includes a ".", we have to escape it$jane = $cassandra->get('user.'.Cassandra::escape('jane.doe'));echo 'User "jane.doe": <pre>'.print_r($jane, true).'</pre><hr/>';// there is some syntatic sugar on the query of Cassandra::get() allowing you// to fetch specific columns, ranges of them, limit amount etc. for example,// lets only fetch columns name and age$chuck = $cassandra->get('user.chuck:name,age');echo 'User "chuck", name and age: <pre>'.print_r($chuck, true).'</pre><hr/>';// fetch all solumns from age to name (gets all columns in-between too)$chuck2 = $cassandra->get('user.chuck:age-name');echo 'User "chuck", columns ago to name: <pre>'.print_r($chuck2, true).'</pre><hr/>';// the range columns do not need to exist, we can get character ranges$chuck3 = $cassandra->get('user.chuck:a-z');echo 'User "chuck", columns a-z: <pre>'.print_r($chuck3, true).'</pre><hr/>';// when performing range queries, we can also limit the number of columns// returned (2); also the method accepts consistency level as second parameter$chuck4 = $cassandra->get('user.chuck:a-z|2', Cassandra::CONSISTENCY_ALL);echo 'User "chuck", columns a-z, limited to 2 columns: <pre>'.print_r($chuck4, true).'</pre><hr/>';// the Cassandra::get() is a convinience method proxying to lower level// CassandraColumnFamily::get(), no need to worry about escaping with this.// column family has additional methods getAll(), getColumns(), getColumnRange()// that all map to lower level get() calls with more appopriate parameters$jane2 = $cassandra->cf('user')->get('jane.doe');echo 'User "jane.doe", lower level api: <pre>'.print_r($jane2, true).'</pre><hr/>';// we defined a secondary index on "age" column of "user" column family so we// can use CassandraColumnFamily::getWhere() to fetch users of specific age.// this returns an iterator that you can go over with foreach or use the// getAll() method that fetches all the data and returns an array$aged24 = $cassandra->cf('user')->getWhere(array('age' => 24));echo 'Users at age 24: <pre>'.print_r($aged24->getAll(), true).'</pre><hr/>';// if we know we are going to need to values of several keys, we can request// them in a single query for better performance$chuckAndJohn = $cassandra->cf('user')->getMultiple(array('chuck', 'john'));echo 'Users "chuck" and "john": <pre>'.print_r($chuckAndJohn, true).'</pre><hr/>';/* Uncomment this when using order preserving partitioner// we can fetch a range of keys but this is predictable only if using an// order preserving partitioner, Cassandra defaults to random one// again as there may be more results than it's reasonable to fetch in a single// query, an iterator is returned that can make several smaller range queries// as the data is iterated$usersAZ = $cassandra->cf('user')->getKeyRange('a', 'z');echo 'Users with keys in range a-z: <pre>'.print_r($usersAZ->getAll(), true).'</pre><hr/>';*/// find the number of columns a key has, we could also request for ranges$chuckColumnCount = $cassandra->cf('user')->getColumnCount('chuck');echo 'User "chuck" column count: <pre>'.print_r($chuckColumnCount, true).'</pre><hr/>';// we can find column counts for several keys at once$chuckJaneColumnCounts = $cassandra->cf('user')->getColumnCounts(array('chuck', 'jane.doe'));echo 'User "chuck" and "jane.doe" column counts: <pre>'.print_r($chuckJaneColumnCounts, true).'</pre><hr/>';// setting supercolumn values is similar to normal column families$cassandra->set('cities.Estonia',array('Tallinn' => array('population' => '411980','comment' => 'Capital of Estonia','size' => 'big'),'Tartu' => array('population' => '98589','comment' => 'City of good thoughts','size' => 'medium')));// fetch all columns of Tartu in Estonia of cities$tartu = $cassandra->cf('cities')->getAll('Estonia', 'Tartu');echo 'Super-column cities.Estonia.Tartu: <pre>'.print_r($tartu, true).'</pre><hr/>';// we could also use the higher level Cassandra::get() to fetch supercolumn info// we can still use the additional filters of columns$tallinn = $cassandra->get('cities.Estonia.Tallinn:population,size');echo 'Super-column cities.Estonia.Tallinn: <pre>'.print_r($tallinn, true).'</pre><hr/>';// you can delete all the data in a column family using "truncate"$cassandra->truncate('user');// you may choose to drop an entire keyspace$cassandra->dropKeyspace('CassandraExample');?>