python3中的mysql数据库操作

软硬件环境

• OS X EI Capitan
• Python 3.5.1
• mysql 5.6

前言

在开发中经常涉及到数据库的使用，而python对于数据库也有多种解决方法。本文以python3中的mysql为例，介绍pymysql模块的使用。

准备数据库

创建一个mysql数据库，名字叫testdb,建立一张表叫testtable，它有3个字段，分别是id，数据类型是INT(11)，设为主键、非空、UNSIGNED、AUTO INCREMENT，name，数据类型是VARCHAR(45),设为非空、唯一，sex，数据类型是VARCHAR(45)，设为非空

python3 源码

# -*- coding: utf-8 -*-
__author__ = '[e-mail]'

import logging
import pymysql

class MySQLCommand(object):
    def __init__(self,host,port,user,passwd,db,table):
        self.host = host
        self.port = port
        self.user = user
        self.password = passwd
        self.db = db
        self.table = table

    def connectMysql(self):
        try:
            self.conn = pymysql.connect(host=self.host,port=self.port,user=self.user,passwd=self.password,db=self.db,charset='utf8')
            self.cursor = self.conn.cursor()
        except:
            print('connect mysql error.')

    def queryMysql(self):
        sql = "SELECT * FROM " + self.table

        try:
            self.cursor.execute(sql)
            row = self.cursor.fetchone()
            print(row)

        except:
            print(sql + ' execute failed.')

    def insertMysql(self,id,name,sex):
        sql = "INSERT INTO " + self.table + " VALUES(" + id + "," + "'" + name + "'," + "'" + sex + "')"
        try:
            self.cursor.execute(sql)
        except:
            print("insert failed.")

    def updateMysqlSN(self,name,sex):
        sql = "UPDATE " + self.table + " SET sex='" + sex + "'" + " WHERE name='" + name + "'"
        print("update sn:" + sql)

        try:
            self.cursor.execute(sql)
            self.conn.commit()
        except:
            self.conn.rollback()

    def closeMysql(self):
        self.cursor.close()
        self.conn.close()