cassandra初次使用之添加数据和得到数据
添加数据
package com.guagua.test;import java.io.UnsupportedEncodingException;import java.nio.ByteBuffer;import java.util.List;import org.apache.cassandra.thrift.Cassandra;import org.apache.cassandra.thrift.Column;import org.apache.cassandra.thrift.ColumnOrSuperColumn;import org.apache.cassandra.thrift.ColumnParent;import org.apache.cassandra.thrift.ColumnPath;import org.apache.cassandra.thrift.ConsistencyLevel;import org.apache.cassandra.thrift.InvalidRequestException;import org.apache.cassandra.thrift.NotFoundException;import org.apache.cassandra.thrift.SlicePredicate;import org.apache.cassandra.thrift.SliceRange;import org.apache.cassandra.thrift.TimedOutException;import org.apache.cassandra.thrift.UnavailableException;import org.apache.thrift.TException;import org.apache.thrift.protocol.TBinaryProtocol;import org.apache.thrift.protocol.TProtocol;import org.apache.thrift.transport.TFramedTransport;import org.apache.thrift.transport.TSocket;import org.apache.thrift.transport.TTransport;public class CClient{ public static void main(String[] args) throws TException, InvalidRequestException, UnavailableException, UnsupportedEncodingException, NotFoundException, TimedOutException { //建立连接 TTransport tr = new TFramedTransport(new TSocket("192.168.100.108", 9160)); TProtocol proto = new TBinaryProtocol(tr); Cassandra.Client client = new Cassandra.Client(proto); tr.open(); String key_user_id = "1"; // insert data long timestamp = System.currentTimeMillis(); //相当于DB NAME client.set_keyspace("wyqTest"); //相当于DB Table ColumnParent parent = new ColumnParent("userprofile"); //字段名 Column nameColumn = new Column(toByteBuffer("name")); //字段值 nameColumn.setValue(toByteBuffer("Chris Goffinet")); //插入时间 nameColumn.setTimestamp(timestamp); //将数据添加到cassandra client.insert(toByteBuffer(key_user_id), parent, nameColumn, ConsistencyLevel.ONE); //字段名 Column ageColumn = new Column(toByteBuffer("age")); //字段值 ageColumn.setValue(toByteBuffer("24")); //插入时间 ageColumn.setTimestamp(timestamp); //将数据添加到cassandra client.insert(toByteBuffer(key_user_id), parent, ageColumn, ConsistencyLevel.ONE); //得到相当于DB Table ColumnPath path = new ColumnPath("userprofile"); // read single column path.setColumn(toByteBuffer("name")); System.out.println(client.get(toByteBuffer(key_user_id), path, ConsistencyLevel.ONE)); // read entire row SlicePredicate predicate = new SlicePredicate(); SliceRange sliceRange = new SliceRange(toByteBuffer(""), toByteBuffer(""), false, 10); predicate.setSlice_range(sliceRange); List<columnorsupercolumn> results = client.get_slice(toByteBuffer(key_user_id), parent, predicate, ConsistencyLevel.ONE); for (ColumnOrSuperColumn result : results) { Column column = result.column; System.out.println(toString(column.name) + " -> " + toString(column.value)); } tr.close(); } public static ByteBuffer toByteBuffer(String value) throws UnsupportedEncodingException { return ByteBuffer.wrap(value.getBytes("UTF-8")); } public static String toString(ByteBuffer buffer) throws UnsupportedEncodingException { byte[] bytes = new byte[buffer.remaining()]; buffer.get(bytes); return new String(bytes, "UTF-8"); }}?得到数据
package com.test;import java.util.HashMap;import java.util.Map;import me.prettyprint.cassandra.model.AllOneConsistencyLevelPolicy;import me.prettyprint.cassandra.serializers.StringSerializer;import me.prettyprint.cassandra.service.FailoverPolicy;import me.prettyprint.cassandra.service.template.ColumnFamilyResult;import me.prettyprint.cassandra.service.template.ColumnFamilyTemplate;import me.prettyprint.cassandra.service.template.ColumnFamilyUpdater;import me.prettyprint.cassandra.service.template.ThriftColumnFamilyTemplate;import me.prettyprint.hector.api.Cluster;import me.prettyprint.hector.api.Keyspace;import me.prettyprint.hector.api.exceptions.HectorException;import me.prettyprint.hector.api.factory.HFactory;public class MyTest {/** * @param args */@SuppressWarnings("unchecked")public static void main(String[] args) {String keySpace = "wyqTest";//相当于DB NAMEString columnFamily = "userprofile";//相当于DB TableCluster cluster = HFactory.getOrCreateCluster("Test Cluster","192.168.100.108:9160");Map accessMap = new HashMap();accessMap.put("username", "wyq");accessMap.put("password", "123456");Keyspace ksp = HFactory.createKeyspace(keySpace, cluster,new AllOneConsistencyLevelPolicy(),FailoverPolicy.ON_FAIL_TRY_ALL_AVAILABLE, accessMap);ColumnFamilyTemplate<String, String> template = new ThriftColumnFamilyTemplate<String, String>(ksp, columnFamily, StringSerializer.get(), StringSerializer.get());ColumnFamilyUpdater<String, String> updater = template.createUpdater("u_1");// 以下name,email,time相当于字段updater.setString("name", "wyqa");updater.setString("email", "anotherbug@163.com");updater.setLong("time", System.currentTimeMillis());try { template.update(updater); System.out.println("update ok.");} catch (HectorException e) { e.printStackTrace();}try {ColumnFamilyResult<String, String> res = template.queryColumns("u_1");ColumnFamilyResult<String, String> rest = template.queryColumns("1");String name = res.getString("name");String email = res.getString("email");long time = res.getLong("time");System.out.println("read u_1 name:" + name);System.out.println("read u_1 email:" + email);System.out.println("read u_1 time:" + time);System.out.println("age:" + rest.getString("age"));System.out.println("name:" + rest.getString("name"));} catch (HectorException e) {e.printStackTrace();}}}?