在工作中我们经常会用到数据库中的数据,接下来我们就学习一下,如何快速的从python中读取hive库中的数据
1、安装包首先我们安装一下python链接hive的包impyla,在impyla包安装的时候,就直接将其依赖的包thrift、pure-sasl、thrift_sasl都安装好了
pip install impyla2、链接hive数据库并提取数据 1)提取全部数据/一条数据
conn = connect(host = '172.16.211.30', port = 10000, user = "dw", auth_mechanism = 'PLAIN', password = "123456", database = "dws_xb") cursor = conn.cursor() sql = "select * from dws_xb.s_goods_orders where dt='2022-01-03' limit 100" # 这里是数据提取的sql语句 cursor.execute(sql) data = df(cursor.fetchall()) # fetchall:提取全部数据,fetchone:提取一条数据 cursor.close() conn.close() ''' host:主机地址 port:端口号 user:用户名称 password:密码 database:数据库名称 这些参数可以询问数仓人员得知哦~ '''2)获取每个表的详细情况
conn = connect(host = '172.16.211.30', port = 10000, user = "dw", auth_mechanism = 'PLAIN', password = "123456", database = "dws_xb") cursor = conn.cursor() sql1 = 'show tables' cursor.execute(sql1) tables = df(cursor.fetchall()) data = df() for i in tables[0]: print(i) sql = 'describe ' + i cursor.execute(sql) data = data.append(df(cursor.fetchall())) cursor.close() conn.close()
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