python pymysql 数据查询

实例应用：商城订单数据统计

      查询某段时间内的 总订单数、已支付订单数、总消费金额、已支付消费金额、笔单价、客单价

代码如下：

#!/usr/bin/env python3
# -*- coding:utf-8 -*-

import pymysql
from datetime import date

try:
    # 连接数据库
    conn = pymysql.connect(
        host='******.com',
        user = 'test',
        password = 'test',
        db = 'market_test',
        charset = 'utf8'
    )
except:
    print("连接数据库失败")
    exit(-1)

cur = conn.cursor()

timeStart = date(2019,8,2)
timeEnd = date(2019,8,16)
print("日期：", timeStart,"~",timeEnd)

# 查询某个期间所有订单数（已支付+未支付）
sql_countAll = "select count(*) from record where createtime>'%s' and createtime<'%s';" %(timeStart, timeEnd)
cur.execute(sql_countAll)
countAll = cur.fetchall()[0][0]
print("订单数：",countAll)

# 查询某个期间已支付订单数
sql_countPay = "select count(*) from record where createtime>'%s' and createtime<'%s' and payStatus='2';" %(timeStart, timeEnd)
cur.execute(sql_countPay)
countPay = cur.fetchall()[0][0]
print("已支付订单数：", countPay)

# 查询某个期间的下单总额（已支付+未支付）
sql_amountAll = "select sum(amount) as total from record where createtime>'%s' and createtime<'%s';" %(timeStart, timeEnd)
cur.execute(sql_amountAll)
# 获得的数值类型是decimal，需要转化为float进行运算，否则会报错
amountAll = float(cur.fetchall()[0][0])/100
print("消费金额：%.2f" %amountAll)

# 查询某个期间已支付的订单金额
sql_amountPay = "select sum(amount) as total from record where createtime>'%s' and createtime<'%s' and payStatus='2';" %(timeStart, timeEnd)
cur.execute(sql_amountPay)
# 获得的数值类型是decimal，需要转化为float进行运算，否则会报错
amountPay = float(cur.fetchall()[0][0])/100
print("已支付消费金额：%.2f" %amountPay)

# 查询某个期间下单的用户数（已支付+未支付，用户去重）
sql_userCountPay = "select count(*) from record where createtime>'%s' and createtime<'%s' group by buyerID;" %(timeStart, timeEnd)
userCountPay=float(cur.execute(sql_userCountPay))

if countPay==0:
    print("无支付用户")
else:
    print("笔单价：%.2f" %(amountPay/countPay))
if userCountPay == 0:
    print("无下单用户")
else:
    print("客单价：%.2f" %(amountPay/userCountPay))

cur.close()
conn.close()

#####################
'''
结果：
日期： 2019-08-02 ~ 2019-08-16
订单数： 445
已支付订单数： 284
消费金额：147642.00
已支付消费金额：78025.00
笔单价：274.74
客单价：268.13
'''
#####################