gt.run_sql()是用pymysql 封装的类

distribution_sort_id  type: int目的：将此字段值全部修改为NULL

g=2gt.run_sql("update goods set distribution_sort_id=%s;",(g,))修改是成功的

g='null'  or g="NULL"gt.run_sql("update goods set distribution_sort_id=%s;",(g,))

会报1366错误

解决方法为g=Nonegt.run_sql("update goods set distribution_sort_id=%s;",(g,))

数据库字段distribution_sort_id 就被修改为Null了