Python连接Impala实现步骤解析

from impala.dbapi import connect
conn = connect(host='xxx.xxx.xxx.xxx', port=21050)
cur = conn.cursor()
cur.execute('show databases;')
database_list=cur.fetchall()
for data in database_list:
  print(data)

from impala.dbapi import connect

class IMPALA:
  def __init__(self,host,port,user,pwd,db):
    self.host = host
    self.port = port
    self.user = user
    self.pwd = pwd
    self.db = db



  def __GetConnect(self):
    if not self.db:
      raise(NameError,"没有设置数据库信息")
    self.conn = connect(host=self.host,port=self.port,user=self.user,password=self.pwd,database=self.db)

    cur = self.conn.cursor()
    if not cur:
      raise(NameError,"连接数据库失败")
    else:
      return cur

  def ExecQuery(self,sql):
    cur = self.__GetConnect()
    cur.execute(sql)
    resList = cur.fetchall()

    #查询完毕后必须关闭连接
    self.conn.close()
    return resList

  def ExecNonQuery(self,sql):
    cur = self.__GetConnect()
    cur.execute(sql)
    self.conn.commit()
    self.conn.close()