python3操作mysql数据库的方法

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__ = '[email protected]'

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()