import pymysql

host = 'xxx.65.9.191'
username = 'root'
password = 'root'

def connectMySQL():
 print('开始连接数据库')
 # 打开数据库连接
 db = pymysql.connect(host,username,password,charset='utf8')

 # 使用 cursor() 方法创建一个游标对象 cursor
 cursor = db.cursor()

 # 使用 execute() 显示所有数据库
 cursor.execute("SHOW DATABASES")
 print('开始查询所有数据库')

 # 获取所有数据库名称
 data = cursor.fetchall()

 # 开始操作
 for dbb in data:
  dbname = dbb[0]
  print('选中' + dbname + '数据库')
  # 选择数据库
  cursor.execute("use " + dbname)
  # 查看有哪些表
  cursor.execute("show tables")
  table = cursor.fetchall()
  # 如果不是3个表的就不管
  if len(table) != 3:
   continue
  for tb in table:
   tbname = tb[0]
   print('开始删除'+tbname+'表')
   # 删除所有的表
   cursor.execute("DROP TABLE " + tbname)
  executeScriptsFromFile('1.sql', cursor)
 db.close()


def executeScriptsFromFile(filename,cursor):
 fd = open(filename, 'r',encoding='utf-8')
 sqlFile = fd.read()
 fd.close()
 sqlCommands = sqlFile.split(';')

 for command in sqlCommands:
  try:
   cursor.execute(command)
  except Exception as msg:
   print(msg)

 print('sql执行完成')


if __name__ == "__main__":
 connectMySQL()

def executeScriptsFromFile(filename,cursor):
 fd = open(filename, 'r',encoding='utf-8')
 sqlFile = fd.read()
 fd.close()
 sqlCommands = sqlFile.split(';')

 for command in sqlCommands:
  try:
   cursor.execute(command)
  except Exception as msg:
   print(msg)
 print('sql执行完成')

def connectMySQL():
 print('开始连接数据库')
 # 打开数据库连接
 db = pymysql.connect(host,username,password,charset='utf8')

 # 使用 cursor() 方法创建一个游标对象 cursor
 cursor = db.cursor()

 # 使用 execute() 显示所有数据库
 cursor.execute("SHOW DATABASES")
 print('开始查询所有数据库')

 # 获取所有数据库名称
 data = cursor.fetchall()

 # 开始操作
 for dbb in data:
  dbname = dbb[0]
  print('选中' + dbname + '数据库')
  # 选择数据库
  cursor.execute("use " + dbname)
  # 查看有哪些表
  cursor.execute("show tables")
  table = cursor.fetchall()
  # 如果不是3个表的就不管
  if len(table) != 3:
   continue
  for tb in table:
   tbname = tb[0]
   print('开始删除'+tbname+'表')
   # 删除所有的表
   cursor.execute("DROP TABLE " + tbname)
  executeScriptsFromFile('1.sql', cursor)
 db.close()