插入数据

功能简介

HBase是一个面向列的数据库，一行数据，可能对应多个列族，而一个列族又可以对应多个列。通常，写入数据的时候，我们需要指定要写入的列（含列族名称和列名称）。HBase通过HTable的put方法来Put数据，可以是一行数据也可以是数据集。

代码样例

以下代码片段在com.huawei.bigdata.hbase.examples包的“HBaseSample”类的testPut方法中

public void testPut() {
        LOG.info("Entering testPut.");

        // Specify the column family name.
        byte[] familyName = Bytes.toBytes("info");
        // Specify the column name.
        byte[][] qualifiers = {
            Bytes.toBytes("name"), Bytes.toBytes("gender"), Bytes.toBytes("age"), Bytes.toBytes("address")
        };

        Table table = null;
        try {
            // Instantiate an HTable object.
            table = conn.getTable(tableName);
            List<Put> puts = new ArrayList<Put>();

            // Instantiate a Put object.
            Put put = putData(familyName, qualifiers,
                Arrays.asList("012005000201", "Zhang San", "Male", "19", "Shenzhen, Guangdong"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000202", "Li Wanting", "Female", "23", "Shijiazhuang, Hebei"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000203", "Wang Ming", "Male", "26", "Ningbo, Zhejiang"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000204", "Li Gang", "Male", "18", "Xiangyang, Hubei"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000205", "Zhao Enru", "Female", "21", "Shangrao, Jiangxi"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000206", "Chen Long", "Male", "32", "Zhuzhou, Hunan"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000207", "Zhou Wei", "Female", "29", "Nanyang, Henan"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000208", "Yang Yiwen", "Female", "30", "Kaixian, Chongqing"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000209", "Xu Bing", "Male", "26", "Weinan, Shaanxi"));
            puts.add(put);

            put = putData(familyName, qualifiers,
                Arrays.asList("012005000210", "Xiao Kai", "Male", "25", "Dalian, Liaoning"));
            puts.add(put);

            // Submit a put request.
            table.put(puts);

            LOG.info("Put successfully.");
        } catch (IOException e) {
            LOG.error("Put failed ", e);
        } finally {
            if (table != null) {
                try {
                    // Close the HTable object.
                    table.close();
                } catch (IOException e) {
                    LOG.error("Close table failed ", e);
                }
            }
        }
        LOG.info("Exiting testPut.");
    }

注意事项

不允许多个线程在同一时间共用同一个HTable实例。HTable是一个非线程安全类，因此，同一个HTable实例，不应该被多个线程同时使用，否则可能会带来并发问题。