HBase JavaAPI：DDL

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;
import java.util.List;

public class DDLTest01 {
    
    
    public static void main(String[] args) throws IOException {
    
    
        //构建实例
        DDLTest01 test01 = new DDLTest01();
        //构建配置对象,用于管理当前程序的所有配置：用于加载hbase-default和hbase-site文件
        Configuration conf = HBaseConfiguration.create();
        //在配置中指定服务端地址:Zookeeper地址
        conf.set("hbase.zookeeper.quorum","node1:2181,node2:2181,node3:2181");
        //构建连接对象
        Connection conn = ConnectionFactory.createConnection(conf);
        //构建管理员
        Admin admin = conn.getAdmin();

        //NS操作:列举、创建、删除
        //test01.listNS(admin);
        //test01.createNS(admin);
        //test01.delNS(admin);

        //Table操作:列举、创建、删除
        //test01.listTable(admin);
        test01.createTable(admin);
        //释放资源
        admin.close();
        conn.close();
    }
    /**
     * 创建表
     * @param admin
     */
    private void createTable(Admin admin) throws IOException {
    
    
        //定义一个表对象
        TableName tableName = TableName.valueOf("111:01");
        if (admin.tableExists(tableName)){
    
    
            //禁用
            admin.disableTable(tableName);
            //删除
            admin.deleteTable(tableName);
        }
        //构建列族的描述器对象
        ColumnFamilyDescriptor aa = ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes("basic")).setMaxVersions(2).build();
        ColumnFamilyDescriptor bb = ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes("other")).setMaxVersions(1).build();
        //构建一个表的描述器对象
        TableDescriptor build = TableDescriptorBuilder.newBuilder(tableName).setColumnFamily(aa).setColumnFamily(bb).build();
        admin.createTable(build);
    }

    /**
     * 列举所有表
     * @param admin
     */
    private void listTable(Admin admin) throws IOException {
    
    
        List<TableDescriptor> list = admin.listTableDescriptors();
        for (TableDescriptor descriptor : list) {
    
    
            System.out.println(descriptor.getTableName().getNameAsString());
        }
    }

    /**
     * 删除NS
     * @param admin
     */
    private void delNS(Admin admin) throws IOException {
    
    
        admin.deleteNamespace("111");
    }

    /**
     * 创建NS
     * @param admin
     */
    private void createNS(Admin admin) throws IOException {
    
    
        NamespaceDescriptor build = NamespaceDescriptor.create("111").build();
        admin.createNamespace(build);
    }

    /**
     * 列举当前所有的NS
     * @param admin
     */
    private void listNS(Admin admin) throws IOException {
    
    
        NamespaceDescriptor[] descriptors = admin.listNamespaceDescriptors();
        for (NamespaceDescriptor descriptor : descriptors) {
    
    
            System.out.println(descriptor.getName());
        }
    }
}