Python connection database

python2

• MySQLdbjust use

• code show as below

  class sql(object):
      def __init__(self):
          try:
              self.conn = MySQLdb.connect(
                  host=DB_IP,
                  user=DB_USER,
                  passwd=DB_PASSWORD,
                  db=DB_NAME,
              )
              self.conn.set_character_set('utf8')
              self.cur = self.conn.cursor()
              self.cur.execute('SET NAMES utf8;')
              self.cur.execute('SET CHARACTER SET utf8;')
              self.cur.execute('SET character_set_connection=utf8;')
          except Exception as e:
              raise e
      # 返回二维元组，每一条记录作为一个元组，所有的记录再组成一个元组
      def executeQuery(self, sqlcode):
          try:
              self.cur.execute(sqlcode)
              resultSet = self.cur.fetchall()
              self.conn.commit()
              return resultSet
          except Exception as e:
              self.conn.rollback()
              raise e
      def executeUpdate(self, sqlCode):
          try:
              self.cur.execute(sqlCode)
              self.conn.commit()
          except Exception as e:
              self.conn.rollback()
              raise e
      def __del__(self):
          self.conn.close()

  python3

• use pymysql

  db=pymysql.connect(host="192.168.1.102",user="root",password="123456",database="fwwb",charset='utf8')
  cursor = db.cursor()

  When there are many parameters, specify the parameter name, otherwise an error will be reported
• When the query result contains Chinese, you need to specify the charsetparameters, otherwise there will be garbled characters
• When writing the result to the document, the open function needs to add encodinga parameter to specify the encoding

• Inquire

  results = cursor.fetchall() #返回所有结果
  data = cursor.fetchone() #返回单条数据