python 數(shù)據(jù)庫(kù)查詢返回list或tuple實(shí)例
MySQLdb默認(rèn)查詢結(jié)果都是返回tuple,輸出時(shí)候不是很方便,必須按照0,1這樣讀取,無(wú)意中在網(wǎng)上找到簡(jiǎn)單的修改方法,就是傳遞一個(gè)cursors.DictCursor就行。
默認(rèn)程序:
import MySQLdbdb = MySQLdb.connect(host=’localhost’, user=’root’, passwd=’123456’, db=’test’)cur = db.cursor()cur.execute(’select * from user’)rs = cur.fetchall()print rs# 返回類似如下# ((1000L, 0L), (2000L, 0L), (3000L, 0L))
修改后:
import MySQLdbimport MySQLdb.cursorsdb = MySQLdb.connect(host=’localhost’, user=’root’, passwd=’123456’, db=’test’, cursorclass=MySQLdb.cursors.DictCursor)cur = db.cursor()cur.execute(’select * from user’)rs = cur.fetchall()print rs# 返回類似如下# ({’age’: 0L, ’num’: 1000L}, {’age’: 0L, ’num’: 2000L}, {’age’: 0L, ’num’: 3000L})
或者也可以用下面替換connect和cursor部分
db = MySQLdb.connect(host=’localhost’, user=’root’, passwd=’123456’, db=’test’)cur = db.cursor(cursorclass=MySQLdb.cursors.DictCursor)
我的實(shí)踐:
輸出為元組類型:
import pymysql db = pymysql.connect('localhost', 'root', '123456', 'filestore')cursor = db.cursor()sql=’select * from tablelist where id>%s’ %4#查詢方法一cursor.execute(sql)result=cursor.fetchall()print(’result’,result) sql2=’select * from tablelist where id>%s’values=(’4’) # 此處為元組類型#查詢方法二cursor.execute(sql2,values)result2=cursor.fetchall()print(’result2’,result2)id_list=[]tablename_list=[]tabletime_lsit=[]cursor.execute(’select * from tablelist where id>%s’,[4,])result3=cursor.fetchall()print(’type(result3)’,type(result3))#對(duì)((6, ’engineeringdata20180901’, ’1535731200’),)類型數(shù)據(jù)的提取for i in range(len(result3)): id_list.append(result3[i][0]) tablename_list.append(result3[i][1]) tabletime_lsit.append(result3[i][2])print(id_list)print(tabletime_lsit)print(tablename_list)cursor.close()db.close()#輸出結(jié)果:result ((6, ’engineeringdata20180901’, ’1535731200’), (618, ’engineeringdata20180904’, ’1535990400’))result2 ((6, ’engineeringdata20180901’, ’1535731200’), (618, ’engineeringdata20180904’, ’1535990400’))type(result3) <class ’tuple’>[6, 618][’1535731200’, ’1535990400’][’engineeringdata20180901’, ’engineeringdata20180904’]
輸出為list類型:
list_id=[]list_tablename=[]list_tabletime=[]list=get_list(’select * from tablelist where id>%s’,[4])print(’list:’,list)# 對(duì)[{’id’: 6, ’tablename’: ’engineeringdata20180901’, ’tabletime’: ’1535731200’},]類型數(shù)據(jù)的提取for i in range(len(list)): print(list[i]) list_id.append(list[i][’id’]) list_tablename.append(list[i][’tablename’]) list_tabletime.append(list[i][’tabletime’])print(’list_id:’,list_id)print(’list_tabletime:’,list_tabletime)print(’list_tablename:’,list_tablename)# 輸出結(jié)果為:list: [{’id’: 6, ’tablename’: ’engineeringdata20180901’, ’tabletime’: ’1535731200’}, {’id’: 618, ’tablename’: ’engineeringdata20180904’, ’tabletime’: ’1535990400’}]{’id’: 6, ’tablename’: ’engineeringdata20180901’, ’tabletime’: ’1535731200’}{’id’: 618, ’tablename’: ’engineeringdata20180904’, ’tabletime’: ’1535990400’}list_id: [6, 618]list_tabletime: [’1535731200’, ’1535990400’]list_tablename: [’engineeringdata20180901’, ’engineeringdata20180904’]
補(bǔ)充知識(shí):python下 將 pymysql 返回的元組數(shù)據(jù)轉(zhuǎn)換為列表
我就廢話不多說(shuō)了,大家還是直接看代碼吧!
from itertools import chain...sql='select elems from table'cursor.execute(sql)elems = cursor.fetchall()resultlist = list(chain.from_iterable(elems))...
以上這篇python 數(shù)據(jù)庫(kù)查詢返回list或tuple實(shí)例就是小編分享給大家的全部?jī)?nèi)容了,希望能給大家一個(gè)參考,也希望大家多多支持好吧啦網(wǎng)。
相關(guān)文章:
1. asp(vbscript)中自定義函數(shù)的默認(rèn)參數(shù)實(shí)現(xiàn)代碼2. Ajax實(shí)現(xiàn)表格中信息不刷新頁(yè)面進(jìn)行更新數(shù)據(jù)3. jsp EL表達(dá)式詳解4. jsp中sitemesh修改tagRule技術(shù)分享5. JavaWeb Servlet中url-pattern的使用6. 爬取今日頭條Ajax請(qǐng)求7. 如何使用瀏覽器擴(kuò)展篡改網(wǎng)頁(yè)中的JS 文件8. ASP基礎(chǔ)知識(shí)VBScript基本元素講解9. ASP刪除img標(biāo)簽的style屬性只保留src的正則函數(shù)10. JSP servlet實(shí)現(xiàn)文件上傳下載和刪除
