python的pymysql使用方法
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前言
pymsql是Python中操作MySQL的模块，其使用方法和MySQLdb几乎相同。但目前pymysql支持python3.x而后者不支持3.x版本。
本文测试python版本：2.6.6。mysql版本：5.7.17
一、安装
pip install pymysql
二、使用操作
创建测试环境
mysql> create database zst; Query OK, 1 row affected (0.03 sec) mysql> use zst Database changed mysql> create table tb(id int 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、查询
#!/usr/bin/python #coding: utf-8 import sys import os import pymysql # 创建连接 conn = pymysql.connect(host=\'127.0.0.1\', port=3307, user=\'root\', passwd=\'hch123\', db=\'zst\', charset=\'utf8\') # 创建游标 cursor = conn.cursor() # 执行SQL cursor.execute("select * from tb") # 获取剩余结果的第一行数据 row_1 = cursor.fetchone() print row_1 # 获取剩余结果前n行数据 row_2 = cursor.fetchmany(3) print row_2 # 获取剩余结果所有数据 row_3 = cursor.fetchall() print row_3 conn.commit() cursor.close() conn.close()
执行
加入try判断
#!/usr/bin/python #coding: utf-8
import pymysql #导入 pymysql #打开数据库连接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法获取操作游标 cur = db.cursor() #1.查询操作 # 编写sql 查询语句 user 对应我的表名 sql = "select * from user" try: cur.execute(sql) #执行sql语句 results = cur.fetchall() #获取查询的所有记录 print("id","name","password") #遍历结果 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() #关闭连接
执行
2、获取新创建数据自增ID
可以获取到最新自增的ID，也就是最后插入的一条数据ID
#!/usr/bin/python #coding: utf-8 import sys import os import pymysql # 创建连接 conn = pymysql.connect(host=\'127.0.0.1\', port=3307, user=\'root\', passwd=\'hch123\', db=\'zst\') # 创建游标 cursor = conn.cursor() # 执行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() #获取自增id new_id = cursor.lastrowid print new_id
查询结果
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判断的python脚本
#!/usr/bin/python #coding: utf-8 import pymysql #导入 pymysql #打开数据库连接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法获取操作游标 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: #错误回滚 db.rollback() finally: db.close()
执行
[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 #导入 pymysql #打开数据库连接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法获取操作游标 cur = db.cursor() sql_update ="update user set username = \'%s\' where id = %d" try: cur.execute(sql_update % ("xiongda",3)) #像sql语句传递参数 #提交 db.commit() except Exception as e: #错误回滚 db.rollback() finally: db.close()
执行
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、删除操作
#!/usr/bin/python #coding: utf-8 import pymysql #导入 pymysql #打开数据库连接 db= pymysql.connect(host="localhost",user="root", password="hch123",db="zst",port=3307) # 使用cursor()方法获取操作游标 cur = db.cursor() sql_delete ="delete from user where id = %d" try: cur.execute(sql_delete % (3)) #像sql语句传递参数 #提交 db.commit() except Exception as e: #错误回滚 db.rollback() finally: db.close()
执行
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数据类型
关于默认获取的数据是元祖类型，如果想要或者字典类型的数据，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\') #游标设置为字典类型 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()
转自
python3.6 使用 pymysql 连接 Mysql 数据库及 简单的增删改查操作 - CSDN博客
https://blog.csdn.net/qq_37176126/article/details/72824106
Python中操作mysql的pymysql模块详解 - 明天OoO你好 - 博客园
http://www.cnblogs.com/wt11/p/6141225.html
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