利用python实现从Oracle读取数据生成图表

import os
import cx_Oracle
import openpyxl
import time
import csv
import xlrd
from matplotlib import pyplot as plt
from matplotlib import font_manager

import os
os.environ['NLS_LANG'] = 'SIMPLIFIED CHINESE_CHINA.UTF8' #字符转换，如果配置了环境变量这里可用不要
os.environ['TNS_ADMIN'] = 'D:\\Python\\instantclient_12_2' #oracle客户端，如果配置了环境变量这里可用不要
os.environ['Path'] = 'D:\\Python\\instantclient_12_2' #自己电脑oracle客户端所在位置

import cx_Oracle

# 方法一：用户名、密码和监听分开写
#  conn=cx_Oracle.connect('username/password@host/orcl')  #连接数据库

# 方法二：用户名、密码和监听写在一起
  conn = cx_Oracle.connect('username/password@host:1521/ORCL') # utf-8显示中文

#方法三：配置监听并连接
#  tns=cx_Oracle.makedsn('host',1521,'orcl',encoding = 'utf-8',nencoding = "UTF-8")
#  conn=cx_Oracle.connect('username','password',tns)

curs=conn.cursor()     #获取cursor
printHeader = True # include column headers in each table output
sql="select b.name,sum（a.tot_qty） from m_retail a ,c_store b " \
  "where a.c_store_id=b.id and a.billdate=20200923 group by b.name" #sql语句
x=curs.execute(sql)             #使用cursor进行各种操作
rows= x.fetchall()
for row in rows:
  print(row)

def export_excel(sql,fileName):
  rr = curs.execute(sql)
  rows = curs.fetchall()

  #获取字段名
  title = [ i[0] for i in curs.description ]

  #创建excel表
  wb = openpyxl.Workbook()
  ws = wb.active

  #插入字段名到第一行
  for c in range(len(title)):
    ws.cell(1,c+1,value = title[c])

  #写入查询数据
  for r in range(len(rows)):
    for c in range(len(rows[r])):
      if rows[r][c]: #值不为空时写入，空值不写入
        ws.cell(r+2,c+1,value=str(rows[r][c])) #str()防止用科学计数法写入造成信息丢失
  #
  # #保存sql脚本
  # ws1 = wb.create_sheet('sql')
  # ws1.cell(1,1,value=sql)
  #
  wb.save(fileName)
  wb.close()
  curs.close()

if __name__ == '__main__':
# 方法一：用户名、密码和监听分开写
#  conn=cx_Oracle.connect('username/password@host/orcl')  #连接数据库

# 方法二：用户名、密码和监听写在一起
  conn = cx_Oracle.connect('username/password@host:1521/ORCL') # utf-8显示中文

#方法三：配置监听并连接
#  tns=cx_Oracle.makedsn('host',1521,'orcl',encoding = 'utf-8',nencoding = "UTF-8")
#  conn=cx_Oracle.connect('username','password',tns)

  curs= conn.cursor()
  #打开sql文件获取sql语句
  with open('零售查询.sql',encoding= 'utf-8') as sql_0:#encoding= 'utf-8'
    sql = sql_0.read()
  # sql = "select b.name as 店仓,sum（a.tot_qty） as 数量 from m_retail a ,c_store b " \
  #    "where a.c_store_id=b.id and a.billdate=20201010 group by b.name"
  cur_date = time.strftime("%Y-%m-%d", time.localtime())#"%Y-%m-%d-%H%M%S",取值日期
  wjm='零售2'+cur_date+'.xlsx'
  export_excel(sql,wjm)
  conn.close()

# 打开文件
data = xlrd.open_workbook(wjm)
cur_month = time.strftime("%m", time.localtime())#取值月份
# 查看工作表
# data.sheet_names()
# print("sheets：" + str(data.sheet_names()))
# 通过文件名获得工作表,获取工作表Sheet
# table = data.sheet_by_name(Sheet1)
table =data.sheet_by_index(0)#默认读取sheet1

cel_A1=table.cell(0,0)#取指定单元格的值
cel_B1=table.cell(0,1)
col_A=table.col_values(0,1)#取指定列的值
col_B=table.col_values(1,1)#
col_B = [ int(x) for x in col_B ]#文本转数字
# print(cel_A1)
# print(col_B)
# print("整行值：" + str(table.row_values(0)))
# print("整列值：" + str(table.col_values(0,1)))
# print("整列值：" + str(table.col_values(1,1)))
# print(col_A)

#设置绘图时的，中文字符显示
#my_font=font_manager.FontProperties(fname=r"C:/Windows/Fonts/simhei.ttf", size=18)
plt.rcParams ['font.family']=['sans-serif']
plt.rcParams ['font.sans-serif']=['simhei' ]
plt.rcParams['font.size'] = '20'
plt.rcParams['xtick.labelsize']=16
plt.rcParams['ytick.labelsize']=16

#设置图形大小
plt.figure(figsize=(20,8),dpi=80)

#绘制条形图
plt.bar(range(len(col_A)),col_B)

#设置x轴
plt.xticks(range(len(col_A)),col_A)

plt.title(cur_month+"月份销售分布") #添加标题
plt.savefig("./sig_size3.png")#将图形保存到工程目录

plt.show()