DAL层使用抽象工厂是大家再熟悉不过的设计方法了。最近在回顾项目的时候，发现网上流传的方法大多都存在一个不大不小BUG。对于整个系统而言，轻则需要重新更新配置，重则需要重启。 好了废话不多说，先看代码private static void GetProvider()
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2024-08-15 00:13:29
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perhaps the designated entry point is not set? 这个问题的原因应该是在你的StoryBoard中没有一个view controller设置了Initial Scene。您需要选择一个view conroller作为story board的第一个界面：设置这个很重要Initial Scene；
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2023-02-17 09:23:12
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总结：指定函数的调用规则； 初始化函数的调用顺序与初始化顺序相反。 上面关于指定初始化的规则讲了那么多，其实可以归纳为两点： 便利初始化函数只能调用自己类中的其他初始化方法 指定初始化函数才有资格调用父类的指定初始化函数 苹果官方有个图，有助于我们理解这两点： 当我们为自己创建的类添加指定初始化函数
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2019-02-22 19:42:00
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Created by Wang, Jerry, last modified on Sep 26, 2016
1767277 - R1231: Form of address 0001 not desig
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2021-07-15 17:01:24
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Created by Wang, Jerry, last modified on Sep 26, 20161767277 - R1231: Form of address 0001 not designated for organizations 1921835 - Form of address XXXX not designated for organizations Message Numb
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2022-04-15 16:25:41
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# 解决“The designated data directory /data/mysqldata/ is unusable”问题的步骤
## 介绍
在开发和管理数据库时，经常会遇到一些问题。其中一个常见问题是MySQL数据库在启动时报错“The designated data directory /data/mysqldata/ is unusable”。这个错误意味着MySQL无法使用指定
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2023-08-31 09:13:58
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一、建立通信端口在DriverEntry函数里创建一个安全性叙述子。函数FltBuildDefaultSecurityDescriptor是用来申请一个安全叙述子（简单点就是给使用通信端口的用户申请个权限，这里可以看到申请的权限是FLT_PORT_ALL_ACCESS，意思就是：用户层的程序连接到设置了这个权限级别的通信端口后，可以获得所有操作权限）。函数InitializeObeje
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2024-04-27 20:35:04
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I have tried to download a customer from ERP to CRM via request download. Af
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2022-04-17 10:00:32
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I have tried to download a customer from ERP to CRM via request download. After request download is finished, I saw error message in tcode SMW01: The
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2021-10-22 11:43:04
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I have tried to download a customer from ERP to CRM via request download. After request download is finished, I saw error message in tcode SMW01:The
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2021-07-15 11:37:13
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安装多个MySQL 提示The designated data directory
=================================================
在这篇文章中，我将向你展示如何安装多个MySQL，并解决提示"The designated data directory"的问题。我假设你已经具备一定的开发经验，对MySQL有一定的了解。
整个过程可以分为以下几
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2024-02-04 05:04:00
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Swift defines two kinds of initializers for class types to help ensure all stored properties receive an initial value. These are known as designated i
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2018-04-04 16:41:00
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将C语言转换为C++代码时，发生如下错误 sorry, unimplemented: non-trivial designated initializers not supported。 查找原因，是因为C++结构体初始化时，必须按照定义的顺序进行初始化，不能够跳过其中内容而初始化其他选项，或者定义
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2019-08-15 14:09:00
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Abstract—In healthcare wireless sensor networks (HWSNs), a
lot of personal medical data are collected by wireless sensors.
Given that a medical diagnostic analysis heavily relies on these
medical data
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2024-08-08 10:30:20
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路由器配置指令1查看路由表 show ip route 查看路由接口 show ip interface 查看路由协议 show ip protocol汇总路由:是让同一网段的路由表信息都存放在一个指定的路由器中 网段:指的是相关计算机集合的网络 测试网络连通性 ping 网络地址 默认路由:当路由器从当前路由表中找不到数据包目标地址匹配的路由条目时,就把数据包送到默认静态罗友指定的路由器下一跳I
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2024-07-22 11:06:50
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Abstract— Aggregate signatures enable the sensor nodes of
Industrial Internet of Things to send their signatures to the
aggregator to realize signature compression. Before being stored
in the data cen
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2023-12-19 10:27:44
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Abstract— Aggregate signatures enable the sensor nodes of
Industrial Internet of Things to send their signatures to the
aggregator to realize signature compression. Before being stored
in the data cen
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2023-12-22 23:32:07
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Digital signatures are essential cryptographic tools that provide authentication and integrity in
digital communications. However, privacy-sensitive applications—such as e-voting and digital
cash—requ
Abstract— Aggregate signatures enable the sensor nodes of
Industrial Internet of Things to send their signatures to the
aggregator to realize signature compression. Before being stored
in the data cen
Zero-knowledge succinct arguments of knowledge (zkSNARKs) enable efficient privacy-preserving proofs of membership for general
NP languages. Our focus in this work is on post-quantum zkSNARKs,
with a
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2023-08-12 00:06:39
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