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

  

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