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  • 5.Hbase API 操作开发

      Hbase API 操作开发需要连接Zookeeper进行节点的管理控制

    1.配置 HBaseConfiguration

      包:org.apache.hadoop.hbase.HBaseConfiguration下的HBaseConfiguration

      作用:通过此类可以对HBase进行配置

      static Configuration config = null;
        private Connection connection = null;
        private Table table = null;
        @Before
        public void init() throws Exception {
            config = HBaseConfiguration.create();//HBaseConfiguration.create()默认会从classpath中查找hbase-site.xml中的配置信息,初始化Configuration 
            config.set("hbase.zookeeper.quorum", "shizhan3,shizhan5,shizhan6");// zookeeper地址
            config.set("hbase.zookeeper.property.clientPort", "2183");// zookeeper端口(默认2181)
            connection = ConnectionFactory.createConnection(config);
            table = connection.getTable(TableName.valueOf("user"));//通过连接池获取表
        }

     2.表管理类 HBaseAdmin:

      包:org.apache.hadoop.hbase.client.HBaseAdmin

      作用:提供接口关系HBase 数据库中的表信息   用法:HBaseAdmin admin = new HBaseAdmin(config);

    3.表描述类 HTableDescriptor:

      包:org.apache.hadoop.hbase.HTableDescriptor

      作用:HTableDescriptor 类包含了表的名字以及表的列族信息 

      用法:HTableDescriptor htd =new HTableDescriptor(tablename);  htd.addFamily(new HColumnDescriptor(“myFamily”));

    4.列族描述类 HColumnDescriptor:包:org.apache.hadoop.hbase.HColumnDescriptor,维护列族的信息

    5.创建表的操作:一般我们用Shell创建表

    public void createTable() throws Exception {
            // 创建表管理类
            HBaseAdmin admin = new HBaseAdmin(config); // hbase表管理
            // 创建表描述类
            TableName tableName = TableName.valueOf("test3"); // 表名称
            HTableDescriptor desc = new HTableDescriptor(tableName);
            // 创建列族的描述类
            HColumnDescriptor family = new HColumnDescriptor("info"); // 列族
            // 将列族添加到表中
            desc.addFamily(family);
            HColumnDescriptor family2 = new HColumnDescriptor("info2"); // 列族
            // 将列族添加到表中
            desc.addFamily(family2);
            // 创建表
            admin.createTable(desc); // 创建表
        }

     6.批量插入数据:

    /**
         * 向hbase中增加数据
         */
        @SuppressWarnings({ "deprecation", "resource" })
        @Test
        public void insertData() throws Exception {
            table.setAutoFlushTo(false);
            table.setWriteBufferSize(534534534);
            ArrayList<Put> arrayList = new ArrayList<Put>();
            for (int i = 21; i < 50; i++) {
                Put put = new Put(Bytes.toBytes("1234"+i));
                put.add(Bytes.toBytes("info"), Bytes.toBytes("name"), Bytes.toBytes("wangwu"+i));
                put.add(Bytes.toBytes("info"), Bytes.toBytes("password"), Bytes.toBytes(1234+i));
                arrayList.add(put);
            } 
            //插入数据
            table.put(arrayList);
            //提交
            table.flushCommits();
        }

     7.修改数据:

        /**
         * 修改数据
         */
        @Test
        public void uodateData() throws Exception {
            Put put = new Put(Bytes.toBytes("1234"));
            put.add(Bytes.toBytes("info"), Bytes.toBytes("namessss"), Bytes.toBytes("lisi1234"));
            put.add(Bytes.toBytes("info"), Bytes.toBytes("password"), Bytes.toBytes(1234));
            //插入数据
            table.put(put);
            //提交
            table.flushCommits();
        }

     8.删除数据:

         /**
         * 删除数据
         */
        @Test
        public void deleteDate() throws Exception {
            Delete delete = new Delete(Bytes.toBytes("1234"));
            delete.addFamily(Bytes.toBytes("info1"));//删除列族
            delete.addColumn(Bytes.toBytes("info1"), Bytes.toBytes("name"));//删除列族下的name
            table.delete(delete);
            table.flushCommits();
        }

     9.查询数据:(单挑查询、批量查询、过滤器查询)

    单条查询:

        /**
         * 单条查询
         */
        @Test
        public void queryData() throws Exception {
            Get get = new Get(Bytes.toBytes("1234"));
            Result result = table.get(get);
            System.out.println(Bytes.toInt(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("password"))));
            System.out.println(Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("namessss"))));
            System.out.println(Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("sex"))));
        }

     批量查询(全表扫描):ResultScanner

      包:org.apache.hadoop.hbase.client.ResultScanner(获取值的接口)

    /**
         * 全表扫描
         */
        @Test
        public void scanData() throws Exception {
            //设置全表扫描封装类
            Scan scan = new Scan();
            scan.setStartRow(Bytes.toBytes("wangsf_0"));//区间
            scan.setStopRow(Bytes.toBytes("wangwu"));
            //扫描
            ResultScanner scanner = table.getScanner(scan);
            for (Result result : scanner) {
                System.out.println(Bytes.toString(result.getRow())); //携带的rowkey
                System.out.println(Bytes.toInt(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("password"))));
                System.out.println(Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("name"))));
            }
        }

    过滤器查询

    1.hbase过滤器:  

      FilterList 代表一个过滤器列表,可以添加多个过滤器进行查询,多个过滤器之间的关系有:

      与关系(符合所有):FilterList.Operator.MUST_PASS_ALL  

      或关系(符合任一):FilterList.Operator.MUST_PASS_ONE

    2.过滤器的种类: 

      列值过滤器—SingleColumnValueFilter 过滤列值的相等、不等、范围等

      列名前缀过滤器—ColumnPrefixFilter:过滤指定前缀的列名

      多个列名前缀过滤器—MultipleColumnPrefixFilter过滤多个指定前缀的列名

      rowKey过滤器—RowFilter:通过正则,过滤rowKey值。

    2.1.列值过滤器:

    /**
         * 全表扫描的过滤器
         * 列值过滤器
         */
        @Test
        public void scanDataByFilter1() throws Exception {
            // 创建全表扫描的scan
            Scan scan = new Scan();
            //过滤器:列值过滤器
            SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes("info"),
                    Bytes.toBytes("name"), CompareFilter.CompareOp.EQUAL,
                    Bytes.toBytes("zhangsan2"));//下面示例检查列值和字符串'zhangsan2'相等
            //设置过滤器
            scan.setFilter(filter);
            // 打印结果集
            ResultScanner scanner = table.getScanner(scan);
            for (Result result : scanner) {
                System.out.println(Bytes.toInt(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("password"))));
                System.out.println(Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("name"))));
            }
        }

     2.2.列名前缀过滤器—ColumnPrefixFilter:用于指定列名前缀值相等

    /**
         * 匹配列名前缀过滤器
         */
        @Test
        public void scanDataByFilter3() throws Exception {
            // 创建全表扫描的scan
            Scan scan = new Scan();
            //匹配rowkey以wangsenfeng开头的
            ColumnPrefixFilter filter = new ColumnPrefixFilter(Bytes.toBytes("na"));
            // 设置过滤器
            scan.setFilter(filter);
            // 打印结果集
            ResultScanner scanner = table.getScanner(scan);
            for (Result result : scanner) {
                System.out.println("rowkey:" + Bytes.toString(result.getRow()));
                System.out.println("info:name:"+ Bytes.toString(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("name"))));
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info"), Bytes.toBytes("age")) != null) {
                    System.out.println("info:age:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("age"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info"), Bytes.toBytes("sex")) != null) {
                    System.out.println("infi:sex:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("sex"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("name")) != null) {
                    System.out.println("info2:name:"+ Bytes.toString(result.getValue( Bytes.toBytes("info2"),Bytes.toBytes("name"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("age")) != null) {
                    System.out.println("info2:age:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info2"),Bytes.toBytes("age"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("sex")) != null) {
                    System.out.println("info2:sex:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info2"),Bytes.toBytes("sex"))));
                }
            }
        }

     2.3.多个列值前缀过滤器—MultipleColumnPrefixFilter:用于指定多个前缀

      byte[][] prefixes = new byte[][] {Bytes.toBytes("value1"),Bytes.toBytes("value2")}; 

      Filter f = new MultipleColumnPrefixFilter(prefixes);

      scan.setFilter(f);

    2.4.rowkey过滤器:通常根据rowkey来指定范围时,使用scan扫描器的StartRow和StopRow方法比较好

         /**
         * rowkey过滤器
         */
        @Test
        public void scanDataByFilter2() throws Exception {
            // 创建全表扫描的scan
            Scan scan = new Scan();
            //匹配rowkey以12341开头的
            RowFilter filter = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator("^12341"));
            // 设置过滤器
            scan.setFilter(filter);
            // 打印结果集
            ResultScanner scanner = table.getScanner(scan);
            for (Result result : scanner) {
                System.out.println(Bytes.toInt(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("password"))));
                System.out.println(Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("name"))));
            }
        }
        

     2.5.过滤器集合FilterList: 

         /**
         * 过滤器集合
         */
        @Test
        public void scanDataByFilter4() throws Exception {
            // 创建全表扫描的scan
            Scan scan = new Scan();
            //过滤器集合:MUST_PASS_ALL(and),MUST_PASS_ONE(or)
            FilterList filterList = new FilterList(Operator.MUST_PASS_ONE);
            //匹配rowkey以wangsenfeng开头的
            RowFilter filter = new RowFilter(CompareFilter.CompareOp.EQUAL, new RegexStringComparator("^wangsenfeng"));
            //匹配name的值等于wangsenfeng
            SingleColumnValueFilter filter2 = new SingleColumnValueFilter(Bytes.toBytes("info"),
                    Bytes.toBytes("name"), CompareFilter.CompareOp.EQUAL,
                    Bytes.toBytes("zhangsan"));
            filterList.addFilter(filter);
            filterList.addFilter(filter2);
            // 设置过滤器
            scan.setFilter(filterList);
            // 打印结果集
            ResultScanner scanner = table.getScanner(scan);
            for (Result result : scanner) {
                System.out.println("rowkey:" + Bytes.toString(result.getRow()));
                System.out.println("info:name:"+ Bytes.toString(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("name"))));
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info"), Bytes.toBytes("age")) != null) {
                    System.out.println("info:age:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("age"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info"), Bytes.toBytes("sex")) != null) {
                    System.out.println("infi:sex:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("sex"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("name")) != null) {
                    System.out.println("info2:name:"+ Bytes.toString(result.getValue(Bytes.toBytes("info2"),Bytes.toBytes("name"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("age")) != null) {
                    System.out.println("info2:age:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("age"))));
                }
                // 判断取出来的值是否为空
                if (result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("sex")) != null) {
                    System.out.println("info2:sex:"+ Bytes.toInt(result.getValue(Bytes.toBytes("info2"),Bytes.toBytes("sex"))));
                }
            }
            
        }

    操作类文件:https://pan.baidu.com/s/1vDc-J-uleBPTB0_IMhAEeA

      

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  • 原文地址:https://www.cnblogs.com/yaboya/p/9349383.html
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