项目框架:spring+springmvc+mybatis 问题描述:前端ajax用post方式提交json数据给后端时,网络报错 415 前端异常信息:Failed to load resource: the server responded with a status of 415 (Unsupported Media Type) 后端异常信息:无 报错原因:缺少jackson包 类似问题注意点: springmvc添加配置.注解: pom.xml添加jackson包引用: Ajax请求
在操作已经创建好的数据库时,若是添加新的实体类或者修改原有数据库上下文,会报如下错误: The model backing the 'StudentDbContext' context has changed since the database was created. Consider using Code First Migrations to update the database(http://go.microsoft.com/fwlink/?LinkId=238269). 解决方法:
oracle-function-into时为null报错 create or replace function P_ADD_CUSTOMER_FOR_CSS_heyt_test(i_cust_name in varchar2, i_en_name in varchar2, i_cust_sex in varchar2, i_cust_birthday in date, i_cust_id_type in varchar2, i_cust_id_no in varchar2, i_data_qua
--如果打开sa属性报错如下:无法显示请求的对话框.属性IsLocked不可用于“登录名sa".该对象可能没有此属性,也可能是访问权限不足而无法检索 --解决办法:首先用windows登录,后打开查询分析器,在查询分析器中输入:alter login sa with password = 'newpwd' unlock, check_policy = off, check_expiration = off
问题:当子查询内存在ORDER BY 字句时查询会报错 SQL: SELECT * FROM ( SELECT * FROM USER ORDER BY USER_CORD ) S. 解决办法:在子查询SQL语句SELECT 后加 TOP 100 PERCENT (查询出前百分比为100的数据,也就是查询出全部数据) SQL: SELECT * FROM ( SELECT TOP 100 PERCENT * FROM USER ORDER BY USER_CORD )
项目中在使用线程跑定时任务时,遇到报错,"Could not open JPA EntityManager for transaction Caused by: org.hibernate.exception.GenericJDBCException: Unable to acquire JDBC Connection",报错信息看是数据库连接无法获取问题,但是在开发调试的过程中,并没有这个错误,只有在部署到机器,运行定时任务时,会抛出这样的异常: 自己定位无果后,求助于同组大哥,大哥