通过Java Api与HBase交互(转)

HBase提供了Java Api的访问接口，掌握这个就跟Java应用使用RDBMS时需要JDBC一样重要，本文将继续前两篇文章中blog表的示例，介绍常用的Api。

import java.io.IOException;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.hbase.HBaseConfiguration;import org.apache.hadoop.hbase.HColumnDescriptor;import org.apache.hadoop.hbase.HTableDescriptor;import org.apache.hadoop.hbase.KeyValue;import org.apache.hadoop.hbase.client.Delete;import org.apache.hadoop.hbase.client.Get;import org.apache.hadoop.hbase.client.HBaseAdmin;import org.apache.hadoop.hbase.client.HTable;import org.apache.hadoop.hbase.client.HTablePool;import org.apache.hadoop.hbase.client.Put;import org.apache.hadoop.hbase.client.Result;import org.apache.hadoop.hbase.client.ResultScanner;import org.apache.hadoop.hbase.client.Scan;import org.apache.hadoop.hbase.util.Bytes;public class Hbase {    // 声明静态配置    static Configuration conf = null;    static {        conf = HBaseConfiguration.create();        conf.set("hbase.zookeeper.quorum", "localhost");    }    /*     * 创建表     *      * @tableName 表名     *      * @family 列族列表     */    public static void creatTable(String tableName, String[] family)            throws Exception {        HBaseAdmin admin = new HBaseAdmin(conf);        HTableDescriptor desc = new HTableDescriptor(tableName);        for (int i = 0; i < family.length; i++) {            desc.addFamily(new HColumnDescriptor(family[i]));        }        if (admin.tableExists(tableName)) {            System.out.println("table Exists!");            System.exit(0);        } else {            admin.createTable(desc);            System.out.println("create table Success!");        }    }    /*     * 为表添加数据（适合知道有多少列族的固定表）     *      * @rowKey rowKey     *      * @tableName 表名     *      * @column1 第一个列族列表     *      * @value1 第一个列的值的列表     *      * @column2 第二个列族列表     *      * @value2 第二个列的值的列表     */    public static void addData(String rowKey, String tableName,            String[] column1, String[] value1, String[] column2, String[] value2)            throws IOException {        Put put = new Put(Bytes.toBytes(rowKey));// 设置rowkey        HTable table = new HTable(conf, Bytes.toBytes(tableName));// HTabel负责跟记录相关的操作如增删改查等//                                                                    // 获取表        HColumnDescriptor[] columnFamilies = table.getTableDescriptor() // 获取所有的列族                .getColumnFamilies();        for (int i = 0; i < columnFamilies.length; i++) {            String familyName = columnFamilies[i].getNameAsString(); // 获取列族名            if (familyName.equals("article")) { // article列族put数据                for (int j = 0; j < column1.length; j++) {                    put.add(Bytes.toBytes(familyName),                            Bytes.toBytes(column1[j]), Bytes.toBytes(value1[j]));                }            }            if (familyName.equals("author")) { // author列族put数据                for (int j = 0; j < column2.length; j++) {                    put.add(Bytes.toBytes(familyName),                            Bytes.toBytes(column2[j]), Bytes.toBytes(value2[j]));                }            }        }        table.put(put);        System.out.println("add data Success!");    }    /*     * 根据rwokey查询     *      * @rowKey rowKey     *      * @tableName 表名     */    public static Result getResult(String tableName, String rowKey)            throws IOException {        Get get = new Get(Bytes.toBytes(rowKey));        HTable table = new HTable(conf, Bytes.toBytes(tableName));// 获取表        Result result = table.get(get);        for (KeyValue kv : result.list()) {            System.out.println("family:" + Bytes.toString(kv.getFamily()));            System.out                    .println("qualifier:" + Bytes.toString(kv.getQualifier()));            System.out.println("value:" + Bytes.toString(kv.getValue()));            System.out.println("Timestamp:" + kv.getTimestamp());            System.out.println("-------------------------------------------");        }        return result;    }    /*     * 遍历查询hbase表     *      * @tableName 表名     */    public static void getResultScann(String tableName) throws IOException {        Scan scan = new Scan();        ResultScanner rs = null;        HTable table = new HTable(conf, Bytes.toBytes(tableName));        try {            rs = table.getScanner(scan);            for (Result r : rs) {                for (KeyValue kv : r.list()) {                    System.out.println("row:" + Bytes.toString(kv.getRow()));                    System.out.println("family:"                            + Bytes.toString(kv.getFamily()));                    System.out.println("qualifier:"                            + Bytes.toString(kv.getQualifier()));                    System.out                            .println("value:" + Bytes.toString(kv.getValue()));                    System.out.println("timestamp:" + kv.getTimestamp());                    System.out                            .println("-------------------------------------------");                }            }        } finally {            rs.close();        }    }    /*     * 遍历查询hbase表     *      * @tableName 表名     */    public static void getResultScann(String tableName, String start_rowkey,            String stop_rowkey) throws IOException {        Scan scan = new Scan();        scan.setStartRow(Bytes.toBytes(start_rowkey));        scan.setStopRow(Bytes.toBytes(stop_rowkey));        ResultScanner rs = null;        HTable table = new HTable(conf, Bytes.toBytes(tableName));        try {            rs = table.getScanner(scan);            for (Result r : rs) {                for (KeyValue kv : r.list()) {                    System.out.println("row:" + Bytes.toString(kv.getRow()));                    System.out.println("family:"                            + Bytes.toString(kv.getFamily()));                    System.out.println("qualifier:"                            + Bytes.toString(kv.getQualifier()));                    System.out                            .println("value:" + Bytes.toString(kv.getValue()));                    System.out.println("timestamp:" + kv.getTimestamp());                    System.out                            .println("-------------------------------------------");                }            }        } finally {            rs.close();        }    }    /*     * 查询表中的某一列     *      * @tableName 表名     *      * @rowKey rowKey     */    public static void getResultByColumn(String tableName, String rowKey,            String familyName, String columnName) throws IOException {        HTable table = new HTable(conf, Bytes.toBytes(tableName));        Get get = new Get(Bytes.toBytes(rowKey));        get.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName)); // 获取指定列族和列修饰符对应的列        Result result = table.get(get);        for (KeyValue kv : result.list()) {            System.out.println("family:" + Bytes.toString(kv.getFamily()));            System.out                    .println("qualifier:" + Bytes.toString(kv.getQualifier()));            System.out.println("value:" + Bytes.toString(kv.getValue()));            System.out.println("Timestamp:" + kv.getTimestamp());            System.out.println("-------------------------------------------");        }    }    /*     * 更新表中的某一列     *      * @tableName 表名     *      * @rowKey rowKey     *      * @familyName 列族名     *      * @columnName 列名     *      * @value 更新后的值     */    public static void updateTable(String tableName, String rowKey,            String familyName, String columnName, String value)            throws IOException {        HTable table = new HTable(conf, Bytes.toBytes(tableName));        Put put = new Put(Bytes.toBytes(rowKey));        put.add(Bytes.toBytes(familyName), Bytes.toBytes(columnName),                Bytes.toBytes(value));        table.put(put);        System.out.println("update table Success!");    }    /*     * 查询某列数据的多个版本     *      * @tableName 表名     *      * @rowKey rowKey     *      * @familyName 列族名     *      * @columnName 列名     */    public static void getResultByVersion(String tableName, String rowKey,            String familyName, String columnName) throws IOException {        HTable table = new HTable(conf, Bytes.toBytes(tableName));        Get get = new Get(Bytes.toBytes(rowKey));        get.addColumn(Bytes.toBytes(familyName), Bytes.toBytes(columnName));        get.setMaxVersions(5);        Result result = table.get(get);        for (KeyValue kv : result.list()) {            System.out.println("family:" + Bytes.toString(kv.getFamily()));            System.out                    .println("qualifier:" + Bytes.toString(kv.getQualifier()));            System.out.println("value:" + Bytes.toString(kv.getValue()));            System.out.println("Timestamp:" + kv.getTimestamp());            System.out.println("-------------------------------------------");        }        /*         * List<?> results = table.get(get).list(); Iterator<?> it =         * results.iterator(); while (it.hasNext()) {         * System.out.println(it.next().toString()); }         */    }    /*     * 删除指定的列     *      * @tableName 表名     *      * @rowKey rowKey     *      * @familyName 列族名     *      * @columnName 列名     */    public static void deleteColumn(String tableName, String rowKey,            String falilyName, String columnName) throws IOException {        HTable table = new HTable(conf, Bytes.toBytes(tableName));        Delete deleteColumn = new Delete(Bytes.toBytes(rowKey));        deleteColumn.deleteColumns(Bytes.toBytes(falilyName),                Bytes.toBytes(columnName));        table.delete(deleteColumn);        System.out.println(falilyName + ":" + columnName + "is deleted!");    }    /*     * 删除指定的列     *      * @tableName 表名     *      * @rowKey rowKey     */    public static void deleteAllColumn(String tableName, String rowKey)            throws IOException {        HTable table = new HTable(conf, Bytes.toBytes(tableName));        Delete deleteAll = new Delete(Bytes.toBytes(rowKey));        table.delete(deleteAll);        System.out.println("all columns are deleted!");    }    /*     * 删除表     *      * @tableName 表名     */    public static void deleteTable(String tableName) throws IOException {        HBaseAdmin admin = new HBaseAdmin(conf);        admin.disableTable(tableName);        admin.deleteTable(tableName);        System.out.println(tableName + "is deleted!");    }    public static void main(String[] args) throws Exception {        // 创建表        String tableName = "blog2";        String[] family = { "article", "author" };        // creatTable(tableName, family);        // 为表添加数据        String[] column1 = { "title", "content", "tag" };        String[] value1 = {                "Head First HBase",                "HBase is the Hadoop database. Use it when you need random, realtime read/write access to your Big Data.",                "Hadoop,HBase,NoSQL" };        String[] column2 = { "name", "nickname" };        String[] value2 = { "nicholas", "lee" };        addData("rowkey1", "blog2", column1, value1, column2, value2);        addData("rowkey2", "blog2", column1, value1, column2, value2);        addData("rowkey3", "blog2", column1, value1, column2, value2);        // 遍历查询        getResultScann("blog2", "rowkey4", "rowkey5");        // 根据row key范围遍历查询        getResultScann("blog2", "rowkey4", "rowkey5");        // 查询        getResult("blog2", "rowkey1");        // 查询某一列的值        getResultByColumn("blog2", "rowkey1", "author", "name");        // 更新列        updateTable("blog2", "rowkey1", "author", "name", "bin");        // 查询某一列的值        getResultByColumn("blog2", "rowkey1", "author", "name");        // 查询某列的多版本        getResultByVersion("blog2", "rowkey1", "author", "name");        // 删除一列        deleteColumn("blog2", "rowkey1", "author", "nickname");        // 删除所有列        deleteAllColumn("blog2", "rowkey1");        // 删除表        deleteTable("blog2");    }}

转自 http://www.cnblogs.com/NicholasLee/archive/2012/09/14/2684815.html