解决:pymysql.err.OperationalError: (1054, "Unknown column 'None' in 'where clause'")
下面是我代码中的sql语句
"SELECT question_id, question_type FROM lms_question WHERE company_id ={} AND is_deleted = 0;".format (self.company_id)
运行后报错 : pymysql.err.OperationalError: (1054, "Unknown column 'None' in 'where clause'")
调试后发现问题所在,原来company_id传参时,传了None值,所以才报这个错 !
E pymysql.err.OperationalError: (1054, "Unknown column 'None' in 'where clause'")
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让其运行成功,转成字符串即可,加单引或双引
:company_id 等于的 “{}”加上单引号
"SELECT question_id, question_type FROM lms_question WHERE company_id = '{}' AND is_deleted = 0;".format (self.company_id)
:company_id 等于的 “%s”加上单引号或者双引号
"SELECT question_id, question_type FROM lms_question WHERE company_id = '%s' AND is_deleted = 0;" % self.company_id
:company_id 等于的“{self.company_id}”加上单引号或者双引号
"SELECT question_id, question_type FROM lms_question WHERE company_id = '{self.company_id}' AND is_deleted = 0;"
以上的解决方法其实原理都是一样的,无非就是几种字符串的格式化操作罢了,随便复习了下python字符串的格式化操作!
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