python的pymysql使用方法【轉】
阿新 • • 發佈：2018-09-01
提交 gda bubuko pymysql swd 數據庫 delet 參數 for
前言
pymsql是Python中操作MySQL的模塊，其使用方法和MySQLdb幾乎相同。但目前pymysql支持python3.x而後者不支持3.x版本。
本文測試python版本：2.6.6。mysql版本：5.7.17
一、安裝
pip install pymysql
二、使用操作
創建測試環境
mysql> create database zst; Query OK, 1 row affected (0.03 sec) mysql> use zst Database changed mysql> create table tb(idint not null auto_increment, user varchar(64),pass varchar(64),licnese varchar(64),primary key(id)); Query OK, 0 rows affected (0.08 sec) mysql> insert into tb(user,pass,licnese)values("u1","u1pass","11113"); Query OK, 1 row affected (0.11 sec) mysql> insert into tb(user,pass,licnese)values("u2","u2pass","11113"); Query OK, 1 row affected (0.05 sec) mysql> insert into tb(user,pass,licnese)values("u3","u3pass","11113"); Query OK, 1 row affected (0.00 sec) mysql> insert into tb(user,pass,licnese)values("u5","u5pass","11113"); Query OK, 1 row affected (0.00 sec) mysql> insert into tb(user,pass,licnese)values("u6","u6pass","11113"); Query OK, 1 row affected (0.01 sec) mysql> select * from tb; +----+------+--------+---------+ | id | user | pass | licnese | +----+------+--------+---------+ | 1 | u1 | u1pass | 11113 | | 2 | u2 | u2pass | 11113 | | 3 | u3 | u3pass | 11113 | | 4 | u4 | u4pass | 11113 | | 5 | u5 | u5pass | 11113 | | 6 | u6 | u6pass | 11113 | +----+------+--------+---------+ 6 rows in set (0.00 sec)
1、查詢
#!/usr/bin/python #coding: utf-8 import sys import os import pymysql # 創建連接 conn = pymysql.connect(host=‘127.0.0.1‘, port=3307, user=‘root‘, passwd=‘hch123‘, db=‘zst‘, charset=‘utf8‘) # 創建遊標 cursor = conn.cursor() # 執行SQL cursor.execute("select * from tb") # 獲取剩余結果的第一行數據 row_1 = cursor.fetchone() print row_1 # 獲取剩余結果前n行數據 row_2 = cursor.fetchmany(3) print row_2 # 獲取剩余結果所有數據 row_3 = cursor.fetchall() print row_3 conn.commit() cursor.close() conn.close()
執行
加入try判斷
#!/usr/bin/python #coding: utf-8
import pymysql #導入 pymysql #打開數據庫連接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法獲取操作遊標 cur = db.cursor() #1.查詢操作 # 編寫sql 查詢語句 user 對應我的表名 sql = "select * from user" try: cur.execute(sql) #執行sql語句 results = cur.fetchall() #獲取查詢的所有記錄 print("id","name","password") #遍歷結果 for row in results : id = row[0] name = row[1] password = row[2] print(id,name,password) except Exception as e: raise e finally: db.close() #關閉連接
執行
2、獲取新創建數據自增ID
可以獲取到最新自增的ID，也就是最後插入的一條數據ID
#!/usr/bin/python #coding: utf-8 import sys import os import pymysql # 創建連接 conn = pymysql.connect(host=‘127.0.0.1‘, port=3307, user=‘root‘, passwd=‘hch123‘, db=‘zst‘) # 創建遊標 cursor = conn.cursor() # 執行SQL effect_row = cursor.executemany("insert into tb(user,pass,licnese)values(%s,%s,%s)", [("u3","u3pass","11113"),("u4","u4pass","22224")]) conn.commit() cursor.close() conn.close() #獲取自增id new_id = cursor.lastrowid print new_id
查詢結果
mysql> select * from tb;
+----+------+--------+---------+ | id | user | pass | licnese | +----+------+--------+---------+ | 1 | u1 | u1pass | 11113 | | 2 | u2 | u2pass | 11113 | | 3 | u3 | u3pass | 11113 | | 4 | u4 | u4pass | 11113 | | 5 | u5 | u5pass | 11113 | | 6 | u6 | u6pass | 11113 | | 7 | u3 | u3pass | 11113 | | 8 | u4 | u4pass | 22224 | +----+------+--------+---------+ 8 rows in set (0.00 sec)
加入try判斷的python腳本
#!/usr/bin/python #coding: utf-8 import pymysql #導入 pymysql #打開數據庫連接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法獲取操作遊標 cur = db.cursor() sql_insert ="""insert into user(id,username,password) values(5,‘liu‘,‘1234‘)""" try: cur.execute(sql_insert) #提交 db.commit() except Exception as e: #錯誤回滾 db.rollback() finally: db.close()
執行
[root@hchtest3 ~]# python insert_try.py mysql> select * from zst.user; +----+----------+----------+ | id | username | password | +----+----------+----------+ | 1 | hch | 11113 | | 2 | hch1 | 11114 | | 3 | hch2 | 11115 | | 4 | liu | 1234 | | 5 | liu | 1234 | +----+----------+----------+ 5 rows in set (0.00 sec)
3、更新操作
#!/usr/bin/python #coding: utf-8 import pymysql #導入 pymysql #打開數據庫連接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法獲取操作遊標 cur = db.cursor() sql_update ="update user set username = ‘%s‘ where id = %d" try: cur.execute(sql_update % ("xiongda",3)) #像sql語句傳遞參數 #提交 db.commit() except Exception as e: #錯誤回滾 db.rollback() finally: db.close()
執行
mysql> select * from zst.user; +----+----------+----------+ | id | username | password | +----+----------+----------+ | 1 | hch | 11113 | | 2 | hch1 | 11114 | | 3 | xiongda | 11115 | | 4 | liu | 1234 | | 5 | liu | 1234 | +----+----------+----------+ 5 rows in set (0.00 sec)
4、刪除操作
#!/usr/bin/python #coding: utf-8 import pymysql #導入 pymysql #打開數據庫連接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法獲取操作遊標 cur = db.cursor() sql_delete ="delete from user where id = %d" try: cur.execute(sql_delete % (3)) #像sql語句傳遞參數 #提交 db.commit() except Exception as e: #錯誤回滾 db.rollback() finally: db.close()
執行
mysql> select * from zst.user; +----+----------+----------+ | id | username | password | +----+----------+----------+ | 1 | hch | 11113 | | 2 | hch1 | 11114 | | 4 | liu | 1234 | | 5 | liu | 1234 | +----+----------+----------+ 4 rows in set (0.00 sec)
5、fetch數據類型
關於默認獲取的數據是元祖類型，如果想要或者字典類型的數據，即：
#! /usr/bin/env python # -*- coding:utf-8 -*- # __author__ = "TKQ" import pymysql conn = pymysql.connect(host=‘127.0.0.1‘, port=3306, user=‘root‘, passwd=‘‘, db=‘tkq1‘) #遊標設置為字典類型 cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) cursor.execute("select * from tb7") row_1 = cursor.fetchone() print row_1 #{u‘licnese‘: 213, u‘user‘: ‘123‘, u‘nid‘: 10, u‘pass‘: ‘213‘} conn.commit() cursor.close() conn.close()
轉自
python3.6 使用 pymysql 連接 Mysql 數據庫及 簡單的增刪改查操作 - CSDN博客
https://blog.csdn.net/qq_37176126/article/details/72824106
Python中操作mysql的pymysql模塊詳解 - 明天OoO你好 - 博客園
http://www.cnblogs.com/wt11/p/6141225.html
python的pymysql使用方法【轉】