Python之操作HBASE数据库

目前有两个库可以操作HBASE：hbase-thrift 和  happybase

happybase使用起来比较简单方便，因此重点学习该库，hbase-thrift只做简要介绍。

（一）hbase-thrift

1、使用前先添加库和依赖库：

pip install thrift
pip install hbase-thrift
pip install google-cloud
pip install google-cloud-vision
pip install kazoo

2、连接数据库的配置信息：

#先在Linux上启动HBASE server
#/opt/cloudera/parcels/CDH/lib/hbase/bin/hbase-daemon.sh --config /opt/cloudera/parcels/CDH/lib/hbase/conf foreground_start thrift --infoport 9096 -p 9091
#再运行该python脚本连接服务器

from thrift.transport import TSocket
from hbase import Hbase
from hbase.ttypes import *

host = "xxx.xxx.xxx.xxx"
port = 9091
framed = False

socket = TSocket.TSocket(host, port)
if framed:
    transport = TTransport.TFramedTransport(socket)
else:
    transport = TTransport.TBufferedTransport(socket)
protocol = TBinaryProtocol.TBinaryProtocol(transport)
client = Hbase.Client(protocol)

3、操作数据库

print ("Thrift2 Demo")
print ("This demo assumes you have a table called \"example\" with a column family called \"family1\"")

#打开连接
transport.open()

# 获取所有表名
tableNames = client.getTableNames()
print('tableNames:', tableNames)

#关闭连接
transport.close()


#################################################
# #结果为：
# Thrift2 Demo
# This demo assumes you have a table called "example" with a column family called "family1"
# tableNames: ['lrx_hbase_test', 'lrx_hbase_test2', 'lrx_hbase_test3', 'lrx_test']

 （二）happybase

# pip install thrift
# pip install happybase
# 先在Linux上启动HBASE server
# /opt/cloudera/parcels/CDH/lib/hbase/bin/hbase-daemon.sh --config /opt/cloudera/parcels/CDH/lib/hbase/conf foreground_start thrift --infoport 9096 -p 9091 &
# 再运行python脚本连接服务器
import happybase
from conf import setting
# 创建连接，通过参数size来设置连接池中连接的个数
connection = happybase.Connection(**setting.HBASE)
# 打开传输，无返回值
connection.open()
# 创建表，无返回值
# connection.create_table('lrx_test',
#                         {
#                             'data':dict()
#                         })
# 获取一个表对象，返回一个happybase.table.Table对象(返回二进制表名)
table0 = connection.table('lrx_test')
print('表对象为：')
print(table0) #<happybase.table.Table name=b'lrx_test'>
# 获取表实例，返回一个happybase.table.Table对象(返回表名)
table = happybase.Table('lrx_test',connection)
print('表实例为：')
print(table) #<happybase.table.Table name='lrx_test'>
# 插入数据，无返回值 ----在row1行,data:1列插入值value1
for i in range(5):
    table.put('row%s' %i,{'data:%s'%i:'%s' %i} )
table.put('row5',{'data:5':'value1'})

# 获取单元格数据，返回一个list
content = table.cells('row1','data:1')
print (content) #[b'value1', b'value1']
# 获取计数器列的值，返回当前单元格的值
# content2 = table.counter_get('row2','data:2')
# print(content2) #0
# 获取一个扫描器，返回一个generator
scanner = table.scan()
for k,v in scanner:
    print(k,v)
###########################################
# #结果为：
# #b'row0' {b'data:0': b'0'}
# b'row1' {b'data:1': b'value1'}
# b'row2' {b'data:2': b'2'}
# b'row3' {b'data:3': b'3'}
# b'row4' {b'data:4': b'4'}

print(scanner) #<generator object Table.scan at 0x000001E17CCDAF10>
# 获取一行数据，返回一个dict
info = table.row('row2')
info1={}
for k,v in info.items():
    info1[k.decode()]=v.decode()
print(info1)
#获取表名
table = connection.tables()
print(table)
# 关闭传输，无返回值
connection.close()