Python3連結MySQL資料庫

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Python 2.x 上串連MySQL的庫倒是不少的，其中比較著名就是MySQLdb（Django項目都使用它；我也在開發測試系統時也使用過），見：http://sourceforge.net/projects/mysql-python/

不過，目前MySQLdb並不支援python3.x，網上找了一些方法，後來我還是偶然發現MySQL官方已經提供了MySQL連接器，而且已經有支援Python3.x的版本了。MySQL Connector/Python, a self-contained Python driver for communicating with MySQL servers. 這個用起來還是感覺比較順手的。
關於MySQL Connector/Python的各種介紹、安裝、API等文檔，還是參考官網吧：http://dev.mysql.com/doc/connector-python/en/index.html
（注意：安裝程式將關於MySQL Connnector的python2的源檔案複製到了python3庫的位置（運行時會報語法錯誤），我就直接手動複製了其中python3/目錄下的檔案過去就解決。）

另外，Python3.x串連MySQL的其他方案有：oursql, PyMySQL, myconnpy 等，參考如下連結：

http://packages.python.org/oursql/

https://github.com/petehunt/PyMySQL/

https://launchpad.net/myconnpy

下面只是貼一個試用 MySQL Connector/Python 的Python指令碼吧（包括建立表、插入資料、從檔案讀取並插入資料、查詢資料等）：

View Code PYTHON 

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#!/usr/bin/python3# a sample to use mysql-connector for python3# see details from http://dev.mysql.com/doc/connector-python/en/index.html import mysql.connectorimport sys, os user = ‘root‘pwd = ‘123456‘host = ‘127.0.0.1‘db = ‘test‘ data_file = ‘mysql-test.dat‘ create_table_sql = "CREATE TABLE IF NOT EXISTS mytable ( id int(10) AUTO_INCREMENT PRIMARY KEY, name varchar(20), age int(4) ) CHARACTER SET utf8" insert_sql = "INSERT INTO mytable(name, age) VALUES (‘Jay‘, 22 ), (‘傑‘, 26)"select_sql = "SELECT id, name, age FROM mytable" cnx = mysql.connector.connect(user=user, password=pwd, host=host, database=db)cursor = cnx.cursor() try: cursor.execute(create_table_sql)except mysql.connector.Error as err: print("create table ‘mytable‘ failed.") print("Error: {}".format(err.msg)) sys.exit() try: cursor.execute(insert_sql)except mysql.connector.Error as err: print("insert table ‘mytable‘ failed.") print("Error: {}".format(err.msg)) sys.exit() if os.path.exists(data_file): myfile = open(data_file) lines = myfile.readlines() myfile.close()  for line in lines: myset = line.split() sql = "INSERT INTO mytable (name, age) VALUES (‘{}‘, {})".format(myset[0], myset[1]) try: cursor.execute(sql) except mysql.connector.Error as err: print("insert table ‘mytable‘ from file ‘mysql-test.dat‘ -- failed.") print("Error: {}".format(err.msg)) sys.exit() try: cursor.execute(select_sql) for (id, name, age) in cursor: print("ID:{} Name:{} Age:{}".format(id, name, age))except mysql.connector.Error as err: print("query table ‘mytable‘ failed.") print("Error: {}".format(err.msg)) sys.exit() cnx.commit()cursor.close()cnx.close()

另外，最後再貼一個使用MySQLdb的python2.x程式碼範例吧：

View Code PYTHON 

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#!/usr/bin/python2.7# coding=utf-8 import MySQLdbimport sys host = ‘localhost‘user = ‘root‘pwd = ‘123456‘ # to be modified.db = ‘test‘  if __name__ == ‘__main__‘: conn = MySQLdb.connect(host, user, pwd, db, charset=‘utf8‘); try: conn.ping() except: print ‘failed to connect MySQL.‘ sql = ‘select * from mytable where id = 2‘ cur = conn.cursor() cur.execute(sql) row = cur.fetchone()# print type(row) for i in row: print i cur.close() conn.close() sys.exit()