24 为BBS网站创建表前奏（有点问题）

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1. mysql_manager.py代码

import mysql
from mysql.connector import errorcode
class MysqlManager():
	#配置语句
	dbconfig = {
		"database":"smth",
		"user":"root",
		"password":"root",
		"host":"localhost"
			}
	tables = {}
	#需要执行的SQL语句，利用python中()具有连接功能
	tables['post'] = (
		"CREATE TABLE `post` ("
		"`topic_id` varchar(16) NOT NULL,"
		"`content` varchar(10240) NOT NULL DEFALT '',"
		"`post_index` int NOT NULL default 0,"
		"UNIQUE(`topic_id`,`post_index`)"#保证它的唯一性
		") ENGINE = InnoDB"	#InnoDB是个容器，专门负责存储mysql数据
		)
	def __init__(self,size_pool):
		#连接mysql
		try:	#host默认本机，可以不用指明
			cnx = mysql.connector.connect(user=self.dbconfig['user'],password=self.dbconfig['password'])
		except mysql.connector.Error as err:
			print(err)
			return

		#连接数据库
		cursor = cnx.cursor()
		try:
			cnx.database = self.dbconfig['database']
		#如果指定的数据库不存在
		except mysql.connector.Error as err:
			if err.errno == errorcode.ER_BAD_DB_ERROR:
				self.creat_database(cursor)	#新建数据库
				cnx.database = self.dbconfig['database']
				self.creat_tables(cursor)	#建表
		finally:
			cursor.close()
			cnx.close()
	#数据库不存在时，新建数据库
	def creat_database(self,cursor):
		try:
			cursor.execute(
				"CREATE DATABASE {} CHARACTER SET 'utf8'".format(self.dbconfig['database']))
		except mysql.connector.Error as err:
			print(err)
			exit(1)
	#建表
	def creat_tables(self,cursor):
		try:
			for name, ddl in self.tables.items():
				cursor.execute(ddl)
		except mysql.connector.Error as err:
			if err.errno == errorcode.ER_TABLE_EXISTS_ERROR:
				print(err)
			else:
				print(err)
		else:
			print("tables created")

if __name__=="__main__":
	mysql_mgr = MysqlManager(4)

2. 结果
   
3. 待解决：
   表未创建成功