HBaseAPI

环境准备

新建项目后在pom.xml中添加依赖：

<dependency>
    <groupId>org.apache.hbase</groupId>
    <artifactId>hbase-server</artifactId>
    <version>1.3.</version>
</dependency>

<dependency>
    <groupId>org.apache.hbase</groupId>
    <artifactId>hbase-client</artifactId>
    <version>1.3.</version>
</dependency>

<dependency>
    <groupId>jdk.tools</groupId>
    <artifactId>jdk.tools</artifactId>
    <version>1.8</version>
    <scope>system</scope>
    <systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
</dependency>

HBaseAPI

获取Configuration对象

public static Configuration conf;

static{

//使用HBaseConfiguration的单例方法实例化

conf = HBaseConfiguration.create();

conf.set("hbase.zookeeper.quorum", "192.168.9.102");

conf.set("hbase.zookeeper.property.clientPort", "2181");

}

判断表是否存在

public static boolean isTableExist(String tableName) throws MasterNotRunningException,

ZooKeeperConnectionException, IOException{

//在HBase中管理、访问表需要先创建HBaseAdmin对象

//Connection connection = ConnectionFactory.createConnection(conf);

//HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();

HBaseAdmin admin = new HBaseAdmin(conf);

return admin.tableExists(tableName);

}

创建表

public static void createTable(String tableName, String... columnFamily) throws

MasterNotRunningException, ZooKeeperConnectionException, IOException{

HBaseAdmin admin = new HBaseAdmin(conf);

//判断表是否存在

if(isTableExist(tableName)){

System.out.println("表" + tableName + "已存在");

//System.exit(0);

}else{

//创建表属性对象,表名需要转字节

HTableDescriptor descriptor = new HTableDescriptor(TableName.valueOf(tableName));

//创建多个列族

for(String cf : columnFamily){

descriptor.addFamily(new HColumnDescriptor(cf));

}

//根据对表的配置，创建表

admin.createTable(descriptor);

System.out.println("表" + tableName + "创建成功！");

}

}

删除表

public static void dropTable(String tableName) throws MasterNotRunningException,

ZooKeeperConnectionException, IOException{

HBaseAdmin admin = new HBaseAdmin(conf);

if(isTableExist(tableName)){

admin.disableTable(tableName);

admin.deleteTable(tableName);

System.out.println("表" + tableName + "删除成功！");

}else{

System.out.println("表" + tableName + "不存在！");

}

}

向表中插入数据

public static void addRowData(String tableName, String rowKey, String columnFamily, String

column, String value) throws IOException{

//创建HTable对象

HTable hTable = new HTable(conf, tableName);

//向表中插入数据

Put put = new Put(Bytes.toBytes(rowKey));

//向Put对象中组装数据

put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column), Bytes.toBytes(value));

hTable.put(put);

hTable.close();

System.out.println("插入数据成功");

}

删除多行数据

public static void deleteMultiRow(String tableName, String... rows) throws IOException{

HTable hTable = new HTable(conf, tableName);

List<Delete> deleteList = new ArrayList<Delete>();

for(String row : rows){

Delete delete = new Delete(Bytes.toBytes(row));

deleteList.add(delete);

}

hTable.delete(deleteList);

hTable.close();

}

6.2.7 获取所有数据

public static void getAllRows(String tableName) throws IOException{

HTable hTable = new HTable(conf, tableName);

//得到用于扫描region的对象

Scan scan = new Scan();

//使用HTable得到resultcanner实现类的对象

ResultScanner resultScanner = hTable.getScanner(scan);

for(Result result : resultScanner){

Cell[] cells = result.rawCells();

for(Cell cell : cells){

//得到rowkey

System.out.println("行键:" + Bytes.toString(CellUtil.cloneRow(cell)));

//得到列族

System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));

System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));

System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));

}

}

}

6.2.8 获取某一行数据

public static void getRow(String tableName, String rowKey) throws IOException{

HTable table = new HTable(conf, tableName);

Get get = new Get(Bytes.toBytes(rowKey));

//get.setMaxVersions();显示所有版本

//get.setTimeStamp();显示指定时间戳的版本

Result result = table.get(get);

for(Cell cell : result.rawCells()){

System.out.println("行键:" + Bytes.toString(result.getRow()));

System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));

System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));

System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));

System.out.println("时间戳:" + cell.getTimestamp());

}

}

6.2.9 获取某一行指定“列族:列”的数据

public static void getRowQualifier(String tableName, String rowKey, String family, String

qualifier) throws IOException{

HTable table = new HTable(conf, tableName);

Get get = new Get(Bytes.toBytes(rowKey));

get.addColumn(Bytes.toBytes(family), Bytes.toBytes(qualifier));

Result result = table.get(get);

for(Cell cell : result.rawCells()){

System.out.println("行键:" + Bytes.toString(result.getRow()));

System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));

System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));

System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));

}

}