位置：首页-资讯-后端开发

基于idea操作hbase数据库并映射到hive表

2023-03-19 17:42

短信预约 -IT技能 免费直播动态提醒

一：先关闭所有服务

[root@siwen ~]# stop-hbase.sh -----关闭hbase

[root@siwen ~]# zkServer.sh stop -----关闭zookeeper

[root@siwen ~]# stop-alll.sh -----关闭hadoop

二：配置文件

1，修改host文件：

C:\Windows\System32\drivers\etc在此目录下的hosts文件把此机器的ip和hostname加入进去

2，修改hive-site.xml

[root@siwen ~]# cd /opt/soft/hive312/conf/

[root@siwen conf]# vim ./hive-site.xml

加入下面几行

  <property>
    <name>hive.zookeeper.quorum</name>
    <value>192.168.255.159</value>
  </property>
  <property>
    <name>hbase.zookeeper.quorum</name>
    <value>192.168.255.159</value>
  </property>
  <property>
    <name>hive.aux.jars.path</name>
    <value>file:///opt/soft/hive312/lib/hive-hbase-handler-3.1.2.jar,file:///opt/soft/hive312/lib/zookeeper-3.4.6.jar,file:///opt/soft/hive312/lib/hbase-client-2.3.5.jar,file:///opt/soft/hive312/lib/hbase-common-2.3.5-tests.jar,file:///opt/soft/hive312/lib/hbase-server-2.3.5.jar,file:///opt/soft/hive312/lib/hbase-common-2.3.5.jar,file:///opt/soft/hive312/lib/hbase-protocol-2.3.5.jar,file:///opt/soft/hive312/lib/htrace-core-3.2.0-incubating.jar</value>
  </property>

3，拷贝jar包

①将hbase235/lib目录下所有的jar包都拷贝到hive下面

[root@siwen conf]# cp /opt/soft/hbase235/lib

5，编写查看表结构的方法

    @Test
    public void getAllNamespace() throws IOException {
        List<TableDescriptor> tableDesc = admin.listTableDescriptorsByNamespace("bigdata".getBytes());
        System.out.println(tableDesc.toString());
    }

6，编写插入数据方法

   @Test
   public void insertData() throws IOException {
        //获取表的信息
        Table table = conn.getTable(TableName.valueOf("bigdata:student"));
        //设置行键
        Put put = new Put(Bytes.toBytes("student1"));
        //设置列的标识以及列值
        put.addColumn("info1".getBytes(), "name".getBytes(), "zs".getBytes());
        put.addColumn("info2".getBytes(), "school".getBytes(), "xwxx".getBytes());
        //执行添加
        table.put(put);
 
        //使用集合添加数据
        Put put2 = new Put(Bytes.toBytes("student2"));
        put2.addColumn("info1".getBytes(), "name".getBytes(), "zss".getBytes());
        put2.addColumn("info2".getBytes(), "school".getBytes(), "xwxx".getBytes());
        Put put3 = new Put(Bytes.toBytes("student3"));
        put3.addColumn("info1".getBytes(), "name".getBytes(), "zsr".getBytes());
        put3.addColumn("info2".getBytes(), "school".getBytes(), "xwxx".getBytes());
        List<Put> list = new ArrayList<>();
        list.add(put2);
        list.add(put3);
        table.put(list);
    }

7，编写查询指定数据的方法

    #查询student1的信息
    @Test
    public void queryData() throws IOException {
        Table table = conn.getTable(TableName.valueOf("bigdata:student"));
        Get get = new Get(Bytes.toBytes("student1"));
        Result result = table.get(get);
        byte[] value = result.getValue(Bytes.toBytes("info1"), Bytes.toBytes("name"));
        System.out.println("姓名："+Bytes.toString(value));
        value = result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("school"));
        System.out.println("学校："+Bytes.toString(value));
    }

8，编写扫描数据的方法（所有数据）

    @Test
    public void scanData() throws IOException {
        Table table = conn.getTable(TableName.valueOf("kb21:student"));
        Scan scan = new Scan();
        ResultScanner scanner = table.getScanner(scan);
        for (Result result : scanner) {
            byte[] value = result.getValue(Bytes.toBytes("info1"), Bytes.toBytes("name"));
            System.out.println("姓名："+Bytes.toString(value));
            value = result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("school"));
            System.out.println("学校："+Bytes.toString(value));
            System.out.println(Bytes.toString(result.getRow()));
        }
    }

9，编写删除表的方法

     @Test
    public void deleteTable() throws IOException {
        //先禁用
        admin.disableTable(TableName.valueOf("bigdata:student"));
        //再删除
        admin.deleteTable(TableName.valueOf("bigdata:student"));
    }

创建外部表

---------主要外部表的字段需要和Hbase中的列形成映射

create external table student(
    id string,
    name string,
    school string
)
stored by 'org.apache.hadoop.hive.hbase.HBaseStorageHandler' with
serdeproperties ("hbase.columns.mapping"=":key,info1:name,info2:school")
tblproperties ("hbase.table.name"="bigdata:student");