用python實現簡單翻頁

一般情況下資料庫資料量太大的時候，不宜全部讀取到記憶體中。所以這裡做乙個簡單的上下翻頁的程式。

# !/usr/bin/python

# -*- coding:utf-8 -*- 
# ++++++++++++++++++++
# author: fmspider
# time: 2018-5-28 13:54
# function: 翻頁
import pymysql
# 執行sql語句獲取資料庫資料
def sqlexec(last_nid,is_is):
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='****', db='***', charset='utf8' )
cursor = conn.cursor(cursor=pymysql.cursors.dictcursor)
if is_is:
cursor.execute('select * from image where id>%s limit 10',last_nid)
result = cursor.fetchall()
else:
cursor.execute('select * from image where id<%s order by id desc limit 10 ', last_nid)
result = cursor.fetchall() # 獲取的資料是反的
result = list(reversed(result)) # 翻轉一下
conn.commit()
cursor.close()
conn.close()
return result
# 標誌位
current_lest_nid = 0
current_first_nid = 0
# 翻頁控制
while true:
if p == '2':
is_next = true
ret = sqlexec(current_lest_nid, is_next)
for i in ret:
print(i)
else:
is_next = false
ret = sqlexec(current_first_nid,is_next)
for i in ret:
print(i)
current_lest_nid = ret[-1]['id']
current_first_nid = ret[0]['id']

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