guid

SQL GUID Vs Integer

由 浪尽此生 提交于 2019-12-20 12:11:49
问题 I have recently started a new job and noticed that all the SQL tables use the GUID data type for the primary key. In my previous job we used integers (Auto-Increment) for the primary key and it was a lot more easier to work with in my opinion. For example, say you had two related tables; Product and ProductType - I could easily cross check the 'ProductTypeID' column of both tables for a particular row to quickly map the data in my head because its easy to store the number (2,4,45 etc) as

Generating a unique ID in PHP

由 允我心安 提交于 2019-12-20 11:56:37
问题 I'm trying to generate a unique ID in php in order to store user-uploaded content on a FS without conflicts. I'm using php, and at the moment this little snippet is responsible for generating the UID: $id = tempnam (".", ""); unlink($id); $id = substr($id, 2); This code is hideous: it creates a temporary file on the FS and deletes it, retaining only the relevant unique part of the generated string. Is there any better way to do this, most preferably without any external dependencies? Thanks

How to use Guids in C#?

由 删除回忆录丶 提交于 2019-12-20 08:35:08
问题 This Code: Something = new Guid() is returning: 00000000-0000-0000-0000-000000000000 all the time and I can't tell why? So, why? 回答1: You should use Guid.NewGuid() 回答2: Just a quick explanation for why you need to call NewGuid as opposed to using the default constructor... In .NET all structures (value types like int, decimal, Guid, DateTime, etc) must have a default parameterless constructor that initializes all of the fields to their default value. In the case of Guid, the bytes that make

How to use Guids in C#?

由 浪子不回头ぞ 提交于 2019-12-20 08:33:54
问题 This Code: Something = new Guid() is returning: 00000000-0000-0000-0000-000000000000 all the time and I can't tell why? So, why? 回答1: You should use Guid.NewGuid() 回答2: Just a quick explanation for why you need to call NewGuid as opposed to using the default constructor... In .NET all structures (value types like int, decimal, Guid, DateTime, etc) must have a default parameterless constructor that initializes all of the fields to their default value. In the case of Guid, the bytes that make

Convert GUID to Numeric Equivalent

由 一个人想着一个人 提交于 2019-12-20 04:26:16
问题 I've been asked to export a list of users from ActiveDirectory, and Convert the GUIDs to a numeric equivalent for display (so I'll .ToString that after). I've done some searching but most of the questions are on converting something TO a GUID, or converting a GUID to Int or something silly, (I understand Ints are too small etc..), which arn't really appropriate. I have the AD stuff sorted and the data exported, however I'm wondering what data type / format to use to convert the GUIDs to, and

Is there a way to create an auto-incrementing Guid Primary Key in an Oracle database?

由 霸气de小男生 提交于 2019-12-20 01:58:35
问题 I mostly work with sql-server (when I do work with databases) and I am trying to learn pl-sql. Is there any equivalent to sql-server's auto-generated Guid as primary keys in Oracle? 回答1: You can use SYS_GUID() to generate a GUID, and use it as DEFAULT value of a column: CREATE TABLE test_table ( uid_col RAW(32) DEFAULT SYS_GUID(), some_val VARCHAR2(10) ); EDIT : See answers to this question for more details. 回答2: Make char or varchar2 column data type overwise raw to pass future troubles. 来源：

工作流例子

由 时光毁灭记忆、已成空白 提交于 2019-12-20 01:16:27
本工作流系统是面向系统开发人员的，所以该接口规范也仅适用于开发工作流业务的软件开发人员。 1工作流设计器接口规范 工作流设计器工作流模板定义工具，通过设计器实现在一定业务范围内的流程自定义； 开发人员在使用设计器时，需要进行配置，要了解设计器中集成的基本元素（Activity）的功能、事件的绑定和属性的设置等； 1.1 设计器配置文件接口 配置文件的格式如下： <LocalServiceNode> <LSDLL name ="WF1" value="LocalServiceLib1.dll" desc="市场竞价 LocalService"></LSDLL> <LSDLL name ="WF2" value="LocalServiceLib2.dll" desc="调度算法 LocalService"></LSDLL> </LocalServiceNode> 该配置主要是实现LocalService的动态加载，LocalService 是工作流实现业务流程的核心，后面会详细介绍； 项目名称 描述 <LocalServiceNode></LocalServiceNode> LocalService 节点标记 <LSDLL></LSDLL> LocalService 动态连接库DLL标记节点 name LocalService 的名称，最好用中文描述 Value

工作流规范

由 老子叫甜甜 提交于 2019-12-20 01:15:23
本工作流系统是面向系统开发人员的，所以该接口规范也仅适用于开发工作流业务的软件开发人员。 1工作流设计器接口规范 工作流设计器工作流模板定义工具，通过设计器实现在一定业务范围内的流程自定义； 开发人员在使用设计器时，需要进行配置，要了解设计器中集成的基本元素（Activity）的功能、事件的绑定和属性的设置等； 1.1 设计器配置文件接口 配置文件的格式如下： <LocalServiceNode> <LSDLL name ="WF1" value="LocalServiceLib1.dll" desc="市场竞价 LocalService"></LSDLL> <LSDLL name ="WF2" value="LocalServiceLib2.dll" desc="调度算法 LocalService"></LSDLL> </LocalServiceNode> 该配置主要是实现LocalService的动态加载，LocalService 是工作流实现业务流程的核心，后面会详细介绍； 项目名称 描述 <LocalServiceNode></LocalServiceNode> LocalService 节点标记 <LSDLL></LSDLL> LocalService 动态连接库DLL标记节点 name LocalService 的名称，最好用中文描述 Value

特殊权限 - SUID GUID STICKYBIT

由 試著忘記壹切 提交于 2019-12-20 00:02:21
◆　 SUID ( Set User ID ) Linux里，用户的ID被称作UID。在实际生产中，可能需要临时借用别的用户执行程序，因此需要能够临时变更自己UID的机能叫做SUID。借助SUID权限，用户可以临时调用root权限。 ※　通常，文件的执行是由所属者发起，然而，赋予SUID权限后可临时继承所有者的权限（来执行文件）。通常用于二进制可执行文件上，文件夹赋予该权限无意义。 举个例子，假如我们要变更密码、需要编辑/etc/shadow文件，然而这个文件一般用户并没有修改权限。但由于更改密码的命令 passwd拥有SUID权限、一般用户就可以通过该命令来（继承root的权限进而）更改密码。同时我们也可以看到在ll命令下，拥有SUID权限的文件，执行权限的位置会由x变为s。 $ ls -l /usr/bin/passwd -rwsr-xr-x. 1 root root 25980 Sat 07 2018 /usr/bin/passwd 从上面的命令中可以看到，所有者的权限显示为rws，其中，执行权变成了s。也就是说，有执行该命令权限的而用户可以临时继承所有者（root）的权限。 需要通过chmod来赋予（二进制可执行）文件SUID时，可通过添加数字“4000”来赋予权限。比如，原来的权限为755（rwx r-x r-x），赋予SUID权限后变成4755，即（rws r-x r

TextWriterTraceListener and trace filenames with GUIDs

由 本秂侑毒 提交于 2019-12-19 12:28:10
问题 I use TextWriterTraceListener ( System.Diagnostics ) in my application to trace several things like exceptions,... The application is running on a terminal server and if there are many users using it simultaneously the listener starts to create many tracefiles with random GUIDs in the filename. Are there possibilities or workarounds to avoid this behaviour ? 回答1: I've just taken a look at the documentation for TextWriterTraceListener and there's a note about 1/3 of the way down the page If an
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