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Kubernetes安装Helm服务端tiller报错Error: forwarding ports: error upgrading connection: unable to upgrade connection: pod does not exis
Error: forwarding ports: error upgrading connection: unable to upgrade connection: pod does not exist 安装Helm客户端和服务端后, 执行helm version报错, Error: forward ...
分类:Web程序   时间:2020-06-13 19:32:16    阅读次数:99
「ZOJ 2334」Monkey King
Description Once in a forest, there lived \(n\) aggressive monkeys. At the beginning, they each does things in its own way and none of them knows each ...
分类:其他好文   时间:2020-06-13 00:21:23    阅读次数:79
Flink各种疑难杂症
1. Caused by: java.lang.RuntimeException: Row arity of from does not match serializers. at org.apache.flink.api.java.typeutils.runtime.RowSerializer.c ...
分类:其他好文   时间:2020-06-12 11:09:07    阅读次数:129
mysql查询优化
select * from a where id in (select id from b) 等价于: for select id from b for select 8 from a where a.id = b.id 当b表数据必须小于a表数据时,in优于exists select * from ...
分类:数据库   时间:2020-06-11 22:09:20    阅读次数:99
ORA-00376:file x cannot be read at this time
问题背景: 客户数据库遭遇机房断电情况 之前出现过机房断电情况,重启数据库后发现出现ORA-00376的错误。 问题解决: 通过查询数据文件状态: 1 SQL> select file_id,online_status from dba_data_files order by 1; 2 3 FILE ...
分类:其他好文   时间:2020-06-11 21:36:30    阅读次数:58
class path resource [api.pdf] cannot be opened because it does not exist
1、代码 public void downloadApiDoc(HttpServletResponse response) { ClassPathResource classPathResource = new ClassPathResource("api.pdf"); try (InputStre ...
分类:Windows程序   时间:2020-06-10 11:28:23    阅读次数:75
mysql在DOS环境下操作的命令
管理员运行cmd,执行启动mysql命令:net start MySQL版本号 登录数据库:mysql -u root -p 输入密码 创建数据库:drop database if exists 数据库名; create database 数据库名; 展示数据库:show databases; ...
分类:数据库   时间:2020-06-10 11:23:17    阅读次数:66
LINQ to Entities does not recognize the method , and this method cannot be translated into a store expression 解决办法
根据用户输入的起始日期,查询以起始日期开始的前20条记录,在ASP.NET MVC的Controller代码中这样写: var Logs = db.Log.Take(20); if (!string.IsNullOrEmpty(dateBegin)) { Logs = Logs.Where(a => ...
分类:其他好文   时间:2020-06-09 23:26:07    阅读次数:78
redis基础命令
我们可以使用命令SET将值“ fido”存储在键“ server:name”中: SET server:name "fido" Redis将永久存储我们的数据,因此我们可以稍后询问“密钥服务器:名称中存储的值是多少?” Redis会回复“ fido”:GET server:name => "fido ...
分类:其他好文   时间:2020-06-09 16:36:00    阅读次数:66
Matlab判断文件夹是否存若不存在则创建文件夹
1. folder是相对路径: folder = './abc/';if ~exist(folder,'dir') mkdir(folder)end 在当前文件夹(存放所运行的matlab代码的文件夹)中判断是否存在文件夹abc,如果不存在,则创建。 2. folder是绝对路径: folder = ...
分类:其他好文   时间:2020-06-09 12:47:28    阅读次数:49
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