【文章推荐】sqlalchemy.exc.ArgumentError: Mapper mapped class Result->result could not assemble any primary key 报错解决

原文：sqlalchemy.exc.ArgumentError: Mapper mapped class Result->result could not assemble any primary key 报错解决

用flask开发web网站时，遇到下面的报错 sqlalchemy.exc.ArgumentError: Mapper mapped class Result gt result could not assemble any primary key 解决：按照报错字面的意思，和主键有关，最后发现是我要操作的这张mysql表没有设置主键，才有了这个报错，后来查到资料，flask sqlachemy ...

2021-04-05 20:21 0 557 推荐指数：

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flask启动常见问题1:sqlalchemy.exc.ArgumentError: Mapper mapped class UserCode->data_system_user_email could not assemble any primary key columns for mapped

我的描述：当我编辑好flask以后，ORM映射数据库完成，启动项目时，发生现象：解决：看字面的意思是主键导致的错误，于是我查看了data_system_user_email的键参数配置，发现表没有主键，且我创建orm映射字段也未曾设置primary_key选项，详细 ...

sqlalchemy.exc.ArgumentError: Textual SQL expression 'published==1' should be explicitly declared as text('published==1')

BEGIN: 一般出现在数据库查询，解决方法如下：原代码：修改： END. ...

解决报错：IncompleteElementException: Could not find result map...

今天遇到这样一个报错，记录一下：最后发现是：把 resultType 写成了 resultMap 哈哈，有点小尴尬... ...

sqlalchemy.exc.InvalidRequestError: Table 'run_result' is already defined for this MetaData instance

临时解决办法：在models文件导入db后，加上如下代码：但解决问题的根本之处还是在于找到，为何会声明了2次类的定义呢？解析： table 'roles_users' is already defined for this MetaData instance，意思 ...

Could not find result map

"Exception: org.apache.ibatis.builder.xml.IncompleteStatementException: Could not find result map....." 在使用mybatis 3 和spring 3整合的时候，往往粗心的人会在 ...

sqlalchemy.exc.IntegrityError: (mysql.connector.errors.IntegrityError) 1062 (23000): Duplicate entry '1' for key 'PRIMARY'

排错：看到 Duplicate entry '1' for key 'PRIMARY'是主键错误　看一看自己添加的数据id是１再查询一下数据库中的表，发现id=1的记录已经存在了所以在代码中让id=2，程序即可正常运行 ...

spring 整合Mybatis 错误：A query was run and no Result Maps were found for the Mapped Statement 'com.xxhh.mapper

　　运行环境：jdk1.7.0_17+tomcat 7 + spring：3.2.0 +mybatis：3.2.7+ eclipse 　　错误：A query was run and no Result Maps were found for the Mapped Statement...... ...

关于mysqli_free_result($result)报错

运行原来的一个原生的php写的项目，出现mysqli_free_result($result)的警告　　　　　Warning: mysqli_free_result() expects parameter 1 to be mysqli_result ...

原文：sqlalchemy.exc.ArgumentError: Mapper mapped class Result->result could not assemble any primary key 报错解决

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