Hbase java api
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罗祥
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package com.heibaiying;
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import javafx.util.Pair;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.hbase.HBaseConfiguration;
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import org.apache.hadoop.hbase.HColumnDescriptor;
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import org.apache.hadoop.hbase.HTableDescriptor;
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import org.apache.hadoop.hbase.TableName;
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import org.apache.hadoop.hbase.client.*;
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import org.apache.hadoop.hbase.filter.FilterList;
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import org.apache.hadoop.hbase.util.Bytes;
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import java.io.IOException;
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import java.util.List;
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public class HBaseUtils {
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private static Connection connection;
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static {
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Configuration configuration = HBaseConfiguration.create();
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configuration.set("hbase.zookeeper.property.clientPort", "2181");
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// 如果是集群 则主机名用逗号分隔
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configuration.set("hbase.zookeeper.quorum", "hadoop001");
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try {
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connection = ConnectionFactory.createConnection(configuration);
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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/**
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* 创建HBase表
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*
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* @param tableName 表名
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* @param columnFamilies 列族的数组
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*/
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public static boolean createTable(String tableName, List<String> columnFamilies) {
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try {
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HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();
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if (admin.tableExists(tableName)) {
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return false;
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}
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HTableDescriptor tableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
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columnFamilies.forEach(columnFamily -> {
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HColumnDescriptor columnDescriptor = new HColumnDescriptor(columnFamily);
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columnDescriptor.setMaxVersions(1);
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tableDescriptor.addFamily(columnDescriptor);
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});
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admin.createTable(tableDescriptor);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return true;
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}
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/**
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* 删除hBase表
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*
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* @param tableName 表名
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*/
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public static boolean deleteTable(String tableName) {
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try {
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HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();
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// 删除表前需要先禁用表
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admin.disableTable(tableName);
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admin.deleteTable(tableName);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return true;
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}
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/**
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* 插入数据
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*
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* @param tableName 表名
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* @param rowKey 唯一标识
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* @param columnFamilyName 列族名
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* @param qualifier 列标识
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* @param value 数据
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*/
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public static boolean putRow(String tableName, String rowKey, String columnFamilyName, String qualifier,
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String value) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Put put = new Put(Bytes.toBytes(rowKey));
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put.addColumn(Bytes.toBytes(columnFamilyName), Bytes.toBytes(qualifier), Bytes.toBytes(value));
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table.put(put);
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table.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return true;
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}
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/**
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* 插入数据
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*
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* @param tableName 表名
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* @param rowKey 唯一标识
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* @param columnFamilyName 列族名
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* @param pairList 列标识和值的集合
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*/
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public static boolean putRow(String tableName, String rowKey, String columnFamilyName, List<Pair<String, String>> pairList) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Put put = new Put(Bytes.toBytes(rowKey));
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pairList.forEach(pair -> put.addColumn(Bytes.toBytes(columnFamilyName), Bytes.toBytes(pair.getKey()), Bytes.toBytes(pair.getValue())));
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table.put(put);
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table.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return true;
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}
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/**
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* 根据rowKey获取指定行的数据
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*
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* @param tableName 表名
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* @param rowKey 唯一标识
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*/
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public static Result getRow(String tableName, String rowKey) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Get get = new Get(Bytes.toBytes(rowKey));
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return table.get(get);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 获取指定行指定列(cell)的最新版本的数据
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*
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* @param tableName 表名
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* @param rowKey 唯一标识
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* @param columnFamily 列族
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* @param qualifier 列标识
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*/
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public static String getCell(String tableName, String rowKey, String columnFamily, String qualifier) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Get get = new Get(Bytes.toBytes(rowKey));
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if (!get.isCheckExistenceOnly()) {
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get.addColumn(Bytes.toBytes(columnFamily), Bytes.toBytes(qualifier));
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Result result = table.get(get);
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byte[] resultValue = result.getValue(Bytes.toBytes(columnFamily), Bytes.toBytes(qualifier));
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return Bytes.toString(resultValue);
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} else {
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return null;
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 检索全表
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*
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* @param tableName 表名
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*/
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public static ResultScanner getScanner(String tableName) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Scan scan = new Scan();
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return table.getScanner(scan);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 检索表中指定数据
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*
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* @param tableName 表名
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* @param filterList 过滤器
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*/
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public static ResultScanner getScanner(String tableName, FilterList filterList) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Scan scan = new Scan();
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scan.setFilter(filterList);
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return table.getScanner(scan);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 检索表中指定数据
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*
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* @param tableName 表名
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* @param startRowKey 起始RowKey
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* @param endRowKey 终止RowKey
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* @param filterList 过滤器
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*/
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public static ResultScanner getScanner(String tableName, String startRowKey, String endRowKey,
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FilterList filterList) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Scan scan = new Scan();
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scan.setStartRow(Bytes.toBytes(startRowKey));
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scan.setStopRow(Bytes.toBytes(endRowKey));
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scan.setFilter(filterList);
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return table.getScanner(scan);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 删除指定行记录
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*
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* @param tableName 表名
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* @param rowKey 唯一标识
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*/
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public static boolean deleteRow(String tableName, String rowKey) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Delete delete = new Delete(Bytes.toBytes(rowKey));
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table.delete(delete);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return true;
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}
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/**
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* 删除指定行的指定列
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*
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* @param tableName 表名
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* @param rowKey 唯一标识
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* @param familyName 列族
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* @param qualifier 列标识
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*/
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public static boolean deleteColumn(String tableName, String rowKey, String familyName,
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String qualifier) {
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try {
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Table table = connection.getTable(TableName.valueOf(tableName));
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Delete delete = new Delete(Bytes.toBytes(rowKey));
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delete.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(qualifier));
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table.delete(delete);
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table.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return true;
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}
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}
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