HBase---idea操作Hbase数据库并且映射到Hive

idea操作Hbase数据库并且映射到Hive

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idea操作Hbase数据库

环境准备

再安装过Hadoop+Hive+zookeeper的实验机上

# 将hbase235/lib/下的jar包拷入到hive312/lib/下
# 如果有重复，选择不覆盖
[root@hadoop conf]# cp /opt/soft/hbase235/lib/* /opt/soft/hive312/lib/# 将切换到hbase235/lib目录下
[root@hadoop conf]# cd /opt/soft/hbase235/lib/
# 将hive312/lib/guava-27.0-jre.jar复制到当前目录下
[root@hadoop lib]# cp /opt/soft/hive312/lib/guava-27.0-jre.jar ./# 切换/opt/soft/hive312/conf/目录下
[root@hadoop conf]# cd /opt/soft/hive312/conf/
# 修改 hive-site.xml
[root@hadoop conf]# vim ./hive-site.xml# 添加配置信息
<property><name>hive.zookeeper.quorum</name><value>192.168.95.150</value>
</property>
<property><name>hbase.zookeeper.quorum</name><value>192.168.95.150</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>

添加配置

启动服务

# 启动hadoop
[root@hadoop ~]# start-all.sh
# 启动zookeeper
[root@hadoop ~]# zkServer.sh start
# 启动hbase
[root@hadoop ~]# start-hbase.sh
# 启动hive
[root@hadoop ~]# nohup hive --service metastore &
[root@hadoop ~]# nohup hive --service metastore &

创建Maven工程

添加依赖

<dependency><groupId>org.apache.hbase</groupId><artifactId>hbase-client</artifactId><version>2.3.5</version></dependency><dependency><groupId>org.apache.hbase</groupId><artifactId>hbase-server</artifactId><version>2.3.5</version></dependency>

在测试类中编写初始化方法

初始化：添加hbase信息，连接数据库，hbase连接工厂

    @Beforepublic void init() throws IOException {System.out.println("执行init()方法");config = HBaseConfiguration.create();config.set(HConstants.HBASE_DIR,"hdfs://192.168.95.150:9000/hbase");config.set(HConstants.ZOOKEEPER_QUORUM,"192.168.95.150");config.set(HConstants.CLIENT_PORT_STR,"2181");conn = ConnectionFactory.createConnection(config);admin = conn.getAdmin();}

在测试类中编写关闭方法

/*
*将连接关闭
*/@Afterpublic void close() throws IOException {System.out.println("执行close()方法");if (admin!=null)admin.close();if (conn!=null)conn.close();}

在测试类中编写创建命名空间方法

/*** 创建命名空间*/@Testpublic void createNameSpace() throws IOException {NamespaceDescriptor bigdata = NamespaceDescriptor.create("bigdata").build();admin.createNamespace(bigdata);}

在测试类中编写创建表方法

/** 创建表* */@Testpublic void createTable() throws IOException {//创建表的描述类TableName tableName = TableName.valueOf("bigdata:student");HTableDescriptor desc = new HTableDescriptor(tableName);//创建列族的描述HColumnDescriptor family1 = new HColumnDescriptor("info1");HColumnDescriptor family2 = new HColumnDescriptor("info2");desc.addFamily(family1);desc.addFamily(family2);admin.createTable(desc);*/

在测试类中编写查看表结构方法

    /**查看表结构*/@Testpublic void getAllNamespace() throws IOException {List<TableDescriptor> tableDesc = admin.listTableDescriptorsByNamespace("bigdata".getBytes());System.out.println(tableDesc.toString());}

在测试类中编写插入数据方法

/*** 插入数据*/@Testpublic void insertData() throws IOException {Table table = conn.getTable(TableName.valueOf("bigdata:student"));Put put = new Put(Bytes.toBytes("student1"));put.addColumn("info1".getBytes(),"name".getBytes(),"zs".getBytes());put.addColumn("info2".getBytes(),"school".getBytes(),"njzb".getBytes());Put put2 = new Put(Bytes.toBytes("student2"));put2.addColumn("info1".getBytes(),"name".getBytes(),"zss".getBytes());put2.addColumn("info2".getBytes(),"school".getBytes(),"njzb".getBytes());Put put3 = new Put(Bytes.toBytes("student3"));put3.addColumn("info1".getBytes(),"name".getBytes(),"zsr".getBytes());put3.addColumn("info2".getBytes(),"school".getBytes(),"njzb".getBytes());List<Put> list = new ArrayList<>();list.add(put1);list.add(put2);list.add(put3);table.put(list);}

在测试类中编写查询数据方法（get）

 /** 查询数据 get 查询* */@Testpublic 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));}

在测试类中编写扫描数据方法（scan）

/** scan 扫描数据* */@Testpublic 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()));}}

在测试类中编写删除表方法

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

Hbase表映射成Hive表

使用DataGrip连接Hive

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");

查询

select * from student