云服务器内容精选
-
代码样例 以下代码片段在com.huawei.bigdata.hbase.examples包的“PhoenixSample”类的testPut方法中。 /** * Put data */ public void testPut() { LOG .info("Entering testPut."); String URL = "jdbc:phoenix:" + conf.get("hbase.zookeeper.quorum"); // Insert String upsertSQL = "UPSERT INTO TEST VALUES(1,'John','100000', TO_DATE('1980-01-01','yyyy-MM-dd'))"; try (Connection conn = DriverManager.getConnection(url, props); Statement stat = conn.createStatement()){ // Execute Update SQL stat.executeUpdate(upsertSQL); conn.commit(); LOG.info("Put successfully."); } catch (Exception e) { LOG.error("Put failed.", e); } LOG.info("Exiting testPut."); }
-
代码样例 以下代码片段在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的testGet方法中。 public void testGet() { LOG.info("Entering testGet."); // Specify the column family name. byte[] familyName = Bytes.toBytes("info"); // Specify the column name. byte[][] qualifier = { Bytes.toBytes("name"), Bytes.toBytes("address") }; // Specify RowKey. byte[] rowKey = Bytes.toBytes("012005000201"); Table table = null; try { // Create the Table instance. table = conn.getTable(tableName); // Instantiate a Get object. Get get = new Get(rowKey); // Set the column family name and column name. get.addColumn(familyName, qualifier[0]); get.addColumn(familyName, qualifier[1]); // Submit a get request. Result result = table.get(get); // Print query results. for (Cell cell : result.rawCells()) { LOG.info("{}:{},{},{}", Bytes.toString(CellUtil.cloneRow(cell)), Bytes.toString(CellUtil.cloneFamily(cell)), Bytes.toString(CellUtil.cloneQualifier(cell)), Bytes.toString(CellUtil.cloneValue(cell))); } LOG.info("Get data successfully."); } catch (IOException e) { LOG.error("Get data failed " ,e); } finally { if (table != null) { try { // Close the HTable object. table.close(); } catch (IOException e) { LOG.error("Close table failed " ,e); } } } LOG.info("Exiting testGet."); }
-
代码样例 以下代码片段是登录，创建Connection并创建表的示例，在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的HBaseSample方法中。 private TableName tableName = null; private Connection conn = null; public HBaseSample(Configuration conf) throws IOException { this.tableName = TableName.valueOf("hbase_sample_table"); this.conn = ConnectionFactory.createConnection(conf); }
-
功能介绍 HBase通过ConnectionFactory.createConnection(configuration)方法创建Connection对象。传递的参数为上一步创建的Configuration。 Connection封装了底层与各实际服务器的连接以及与ZooKeeper的连接。Connection通过ConnectionFactory类实例化。创建Connection是重量级操作，Connection是线程安全的，因此，多个客户端线程可以共享一个Connection。 典型的用法，一个客户端程序共享一个单独的Connection，每一个线程获取自己的Admin或Table实例，然后调用Admin对象或Table对象提供的操作接口。不建议缓存或者池化Table、Admin。Connection的生命周期由调用者维护，调用者通过调用close()，释放资源。
-
代码样例 以下代码片段在com.huawei.bigdata.hbase.examples包的“PhoenixSample”类的testSelect方法中。 /** * Select Data */ public void testSelect() { LOG.info("Entering testSelect."); String URL = "jdbc:phoenix:" + conf.get("hbase.zookeeper.quorum"); // Query String querySQL = "SELECT * FROM TEST WHERE id = ?"; Connection conn = null; PreparedStatement preStat = null; Statement stat = null; ResultSet result = null; try { // Create Connection conn = DriverManager.getConnection(url, props); // Create Statement stat = conn.createStatement(); // Create PrepareStatement preStat = conn.prepareStatement(querySQL); // Execute query preStat.setInt(1, 1); result = preStat.executeQuery(); // Get result while (result.next()) { int id = result.getInt("id"); String name = result.getString(1); System.out.println("id: " + id); System.out.println("name: " + name); } LOG.info("Select successfully."); } catch (Exception e) { LOG.error("Select failed.", e); } finally { if (null != result) { try { result.close(); } catch (Exception e2) { LOG.error("Result close failed.", e2); } } if (null != stat) { try { stat.close(); } catch (Exception e2) { LOG.error("Stat close failed.", e2); } } if (null != conn) { try { conn.close(); } catch (Exception e2) { LOG.error("Connection close failed.", e2); } } } LOG.info("Exiting testSelect."); }
-
代码样例 以下代码片段在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的testSingleColumnValueFilter方法中。 public void testSingleColumnValueFilter() { LOG.info("Entering testSingleColumnValueFilter."); Table table = null; ResultScanner rScanner = null; try { table = conn.getTable(tableName); Scan scan = new Scan(); scan.addColumn(Bytes.toBytes("info"), Bytes.toBytes("name")); // Set the filter criteria. SingleColumnValueFilter filter = new SingleColumnValueFilter( Bytes.toBytes("info"), Bytes.toBytes("name"), CompareOperator.EQUAL, Bytes.toBytes("Xu Bing")); scan.setFilter(filter); // Submit a scan request. rScanner = table.getScanner(scan); // Print query results. for (Result r = rScanner.next(); r != null; r = rScanner.next()) { for (Cell cell : r.rawCells()) { LOG.info("{}:{},{},{}", Bytes.toString(CellUtil.cloneRow(cell)), Bytes.toString(CellUtil.cloneFamily(cell)), Bytes.toString(CellUtil.cloneQualifier(cell)), Bytes.toString(CellUtil.cloneValue(cell))); } } LOG.info("Single column value filter successfully."); } catch (IOException e) { LOG.error("Single column value filter failed " ,e); } finally { if (rScanner != null) { // Close the scanner object. rScanner.close(); } if (table != null) { try { // Close the HTable object. table.close(); } catch (IOException e) { LOG.error("Close table failed " ,e); } } } LOG.info("Exiting testSingleColumnValueFilter."); }
-
注意事项 当前二级索引不支持使用SubstringComparator类定义的对象作为Filter的比较器。 例如，如下示例中的用法当前不支持： Scan scan = new Scan(); filterList = new FilterList(FilterList.Operator.MUST_PASS_ALL); filterList.addFilter(new SingleColumnValueFilter(Bytes .toBytes(columnFamily), Bytes.toBytes(qualifier), CompareOperator.EQUAL, new SubstringComparator(substring))); scan.setFilter(filterList);
-
注意事项 注[1]：创建联合索引。 HBase支持在多个字段上创建二级索引，例如在列name和age上。 HIndexSpecification iSpecUnite = new HIndexSpecification(indexName); iSpecUnite.addIndexColumn(new HColumnDescriptor("info"), "name", ValueType.String); iSpecUnite.addIndexColumn(new HColumnDescriptor("info"), "age", ValueType.String);
-
代码样例 hbase.root.logger=INFO,console,RFA //hbase客户端日志输出配置，console：输出到控制台；RFA：输出到日志文件 hbase.security.logger=DEBUG,console,RFAS //hbase客户端安全相关的日志输出配置，console：输出到控制台；RFAS：输出到日志文件 hbase.log.dir=/var/log/Bigdata/hbase/client/ //日志路径，根据实际路径修改，但目录要有写入权限 hbase.log.file=hbase-client.log //日志文件名 hbase.log.level=INFO //日志级别，如果需要更详细的日志定位问题，需要修改为DEBUG，修改完需要重启进程才能生效 hbase.log.maxbackupindex=20 //最多保存的日志文件数目 # Security audit appender hbase.security.log.file=hbase-client-audit.log //审计日志文件命令
-
代码样例 以下代码片段在com.huawei.bigdata.hbase.examples包的“PhoenixSample”类的testCreateTable方法中。 /** * Create Table */ public void testCreateTable() { LOG.info("Entering testCreateTable."); String URL = "jdbc:phoenix:" + conf.get("hbase.zookeeper.quorum"); // Create table String createTableSQL = "CREATE TABLE IF NOT EXISTS TEST (id integer not null primary key, name varchar, " + "account char(6), birth date)"; try (Connection conn = DriverManager.getConnection(url, props); Statement stat = conn.createStatement()) { // Execute Create SQL stat.executeUpdate(createTableSQL); LOG.info("Create table successfully."); } catch (Exception e) { LOG.error("Create table failed.", e); } LOG.info("Exiting testCreateTable."); } /** * Drop Table */ public void testDrop() { LOG.info("Entering testDrop."); String URL = "jdbc:phoenix:" + conf.get("hbase.zookeeper.quorum"); // Delete table String dropTableSQL = "DROP TABLE TEST"; try (Connection conn = DriverManager.getConnection(url, props); Statement stat = conn.createStatement()) { stat.executeUpdate(dropTableSQL); LOG.info("Drop successfully."); } catch (Exception e) { LOG.error("Drop failed.", e); } LOG.info("Exiting testDrop."); }
-
代码样例 以下代码片段在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的testScanData方法中。 public void testScanData() { LOG.info("Entering testScanData."); Table table = null; // Instantiate a ResultScanner object. ResultScanner rScanner = null; try { // Create the Configuration instance. table = conn.getTable(tableName); // Instantiate a Get object. Scan scan = new Scan(); scan.addColumn(Bytes.toBytes("info"), Bytes.toBytes("name")); // Set the cache size. scan.setCaching(1000); // Submit a scan request. rScanner = table.getScanner(scan); // Print query results. for (Result r = rScanner.next(); r != null; r = rScanner.next()) { for (Cell cell : r.rawCells()) { LOG.info("{}:{},{},{}", Bytes.toString(CellUtil.cloneRow(cell)), Bytes.toString(CellUtil.cloneFamily(cell)), Bytes.toString(CellUtil.cloneQualifier(cell)), Bytes.toString(CellUtil.cloneValue(cell))); } } LOG.info("Scan data successfully."); } catch (IOException e) { LOG.error("Scan data failed " ,e); } finally { if (rScanner != null) { // Close the scanner object. rScanner.close(); } if (table != null) { try { // Close the HTable object. table.close(); } catch (IOException e) { LOG.error("Close table failed " ,e); } } } LOG.info("Exiting testScanData."); }
-
注意事项 注[1]：创建联合索引 HBase支持在多个字段上创建二级索引，例如在列name和age上。 HIndexSpecification iSpecUnite = new HIndexSpecification(indexName); iSpecUnite.addIndexColumn(new HColumnDescriptor("info"), "name", ValueType.String); iSpecUnite.addIndexColumn(new HColumnDescriptor("info"), "age", ValueType.String);
-
代码样例 以下代码片段在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的testSingleColumnValueFilter方法中。 public void testSingleColumnValueFilter() { LOG.info("Entering testSingleColumnValueFilter."); Table table = null; ResultScanner rScanner = null; try { table = conn.getTable(tableName); Scan scan = new Scan(); scan.addColumn(Bytes.toBytes("info"), Bytes.toBytes("name")); // Set the filter criteria. SingleColumnValueFilter filter = new SingleColumnValueFilter( Bytes.toBytes("info"), Bytes.toBytes("name"), CompareOperator.EQUAL, Bytes.toBytes("Xu Bing")); scan.setFilter(filter); // Submit a scan request. rScanner = table.getScanner(scan); // Print query results. for (Result r = rScanner.next(); r != null; r = rScanner.next()) { for (Cell cell : r.rawCells()) { LOG.info("{}:{},{},{}", Bytes.toString(CellUtil.cloneRow(cell)), Bytes.toString(CellUtil.cloneFamily(cell)), Bytes.toString(CellUtil.cloneQualifier(cell)), Bytes.toString(CellUtil.cloneValue(cell))); } } LOG.info("Single column value filter successfully."); } catch (IOException e) { LOG.error("Single column value filter failed " ,e); } finally { if (rScanner != null) { // Close the scanner object. rScanner.close(); } if (table != null) { try { // Close the HTable object. table.close(); } catch (IOException e) { LOG.error("Close table failed " ,e); } } } LOG.info("Exiting testSingleColumnValueFilter."); }
-
注意事项 当前二级索引不支持使用SubstringComparator类定义的对象作为Filter的比较器。 例如，如下示例中的用法当前不支持： Scan scan = new Scan(); filterList = new FilterList(FilterList.Operator.MUST_PASS_ALL); filterList.addFilter(new SingleColumnValueFilter(Bytes .toBytes(columnFamily), Bytes.toBytes(qualifier), CompareOperator.EQUAL, new SubstringComparator(substring))); scan.setFilter(filterList);
更多精彩内容
CDN加速
GaussDB
文字转换成语音
免费的服务器
如何创建网站
域名网站购买
私有云桌面
云主机哪个好
域名怎么备案
手机云电脑
SSL证书申请
云点播服务器
免费OCR是什么
电脑云桌面
域名备案怎么弄
语音转文字
文字图片识别
云桌面是什么
网址安全检测
网站建设搭建
国外CDN加速
SSL免费证书申请
短信批量发送
图片OCR识别
云数据库MySQL
个人域名购买
录音转文字
扫描图片识别文字
OCR图片识别
行驶证识别
虚拟电话号码
电话呼叫中心软件
怎么制作一个网站
Email注册网站
华为VNC
图像文字识别
企业网站制作
个人网站搭建
华为云计算
免费租用云托管
云桌面云服务器
ocr文字识别免费版
HTTPS证书申请
图片文字识别转换
国外域名注册商
使用免费虚拟主机
云电脑主机多少钱
鲲鹏云手机
短信验证码平台
OCR图片文字识别
SSL证书是什么
申请企业邮箱步骤
免费的企业用邮箱
云免流搭建教程
域名价格
