java api与hbase交互

朱雀 2022-07-15 00:26 175阅读 0赞

本文转载自：[http://www.cnblogs.com/ggjucheng/p/3381328.html][http_www.cnblogs.com_ggjucheng_p_3381328.html]

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");
    
        }
    }

[http_www.cnblogs.com_ggjucheng_p_3381328.html]: http://www.cnblogs.com/ggjucheng/p/3381328.html