使用mysql-python执行Select语句给出None

Question

我使用python-2.7和newbie到mysql/mysql-python连接器.

我只是想通过以下查询来检索数据 -

SELECT d_id,d_link,d_name FROM d_details

但它给出/返回 无.以下是我的代码 -

def getdbconnection(self):

    try:

        self.cnx = mysql.connector.connect(user='abc',password='xxx',host = 'localhost',port = 'xxx', database='details',buffered=True)      

        print "Done"
        self.cursor = self.cnx.cursor()

    except MySQLdb.Error as error:      
                print "ERROR IN CONNECTION"

def selectst(self):
        try:
                    print "S E L E C T"
                    self.d_deta = self.cursor.execute("SELECT d_id,d_link,d_name FROM `d_details`")
                    print self.d_deta


        except MySQLdb.Error as error:
                            print "---------------------"""
                            print(error)
        self.cnx.commit()

和输出是

   Done

    S E L E C T

    None

虽然查询在工作台中运行良好

欢迎任何形式的帮助/指导.

Answer 1

你应该像这样修改你的代码

代码：

def selectst(self):
    try:
          print "S E L E C T"
          self.cursor.execute("SELECT d_id,d_link,d_name FROM `d_details`")
          print  self.cursor.fetchall() # or fetchone() for one record

    except MySQLdb.Error as error:
                        print "---------------------"""
                        print(error)
    #self.cnx.commit() there is no need of commit here since we are not changing the data of the table

笔记：

• 你得到 None 因为它cursor.execute是像 list.sort() 这样的内存操作
• 该行可以通过迭代cursor object或使用来获取fetch*()