uuid

Using libblkid to find UUID of a partition

由 狂风中的少年 提交于 2019-12-09 13:09:26
问题 I was looking at libblkid and was confused about the documentation. Could someone provide me with an example of how I could find the UUID of a root linux partition using this library? 回答1: It's pretty much as simple as the manual makes it look: you create a probe structure, initialize it, ask it for some information, and then free it. And you can combine the first two steps into one. This is a working program: #include <stdio.h> #include <stdlib.h> #include <err.h> #include <blkid/blkid.h>

Cargo使用文档-指定依赖项

由 半腔热情 提交于 2019-12-09 13:01:18
原文链接： http://doc.crates.io/specifying-dependencies.html#platform-specific-dependencies 你的crates可以依赖于其他的库： 1. crates.io 2.git库 3.本地文件系统的子目录 也可以临时覆盖依赖项的位置-比如说，这样就能够测试你的工作内容的依赖项的BUG修复。你可以对不同的平台有不同的依赖项，以及只在开发期间使用的依赖项。 一、从crates.io指定依赖项 Cargo被设计为默认会从crates.io上搜寻依赖项。在这种方式下，只需要指定一个库名称和版本号，比如： [dependencies] time = "0.1.12" 字符串"0.1.12"要求是语义化标准版本(SemVer)，因为这种字符串没有运算符， ^符号(Caret requirements) ^符号允许以SemVer兼容方式升级到指定版本。只要新的版本号主要，次要，补丁组中最左边非零数字不被修改，这个升级就是被允许的，在这种情况下，如果我们运行 cargo update -p time 如果这个版本可用的话，cargo将会帮我们把time库升级到0.1.13，而绝不会升级到0.2.0，如果我们以^1.0方式指定版本，将会升级到1.1版本但是不会升级到2.0.0.0.x。 ~符号(Tilde

How do I get the UUID of a bluetooth device?

由 孤街浪徒 提交于 2019-12-09 12:51:56
问题 I need to know UUID on API 8 (2.2) or possibly 2.3.3. As I understand the documentation, this should be allowed: phoneDevice = blueAdapter.getRemoteDevice(phoneAddress); ParcelUuid[] phoneUuids = phoneDevice.getUuids(); // Won't compile Eclipse gives me: "The method getUuids() is undefined for the type BluetoothDevice." But see: http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html#getUuids() Also, I would like to know how the UUIDs are "parceled" inside the ParcelUuid

Mybatis 一对多

由 邮差的信 提交于 2019-12-09 12:05:31
自己练习，自己记录。 假设有 student 和 goods 两张表 应用场景一: 一个student可以购买多个goods 一对多 Student.xml文件如下： <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.hz.platform.demo.dao.StudentDao"> <!-- 中文文档https://mybatis.org/mybatis-3/zh/dynamic-sql.html--> <resultMap id="studentResult" type="com.hz.platform.demo.entity.Student"> <result column="uuid" property="uuid" jdbcType="VARCHAR"/> <result column="stu_name" property="stuName" jdbcType="VARCHAR"/> <result column="address" property="address" jdbcType="VARCHAR"/> <result column="age"

Ruby on Rails - generating bit.ly style uuids

由 ≯℡__Kan透↙ 提交于 2019-12-09 06:27:51
问题 I'm trying to generate UUIDs with the same style as bit.ly urls like: http://bit.ly/aUekJP or cloudapp ones: http://cl.ly/1hVU which are even smaller how can I do it? I'm now using UUID gem for ruby but I'm not sure if it's possible to limitate the length and get something like this. I am currently using this: UUID.generate.split("-")[0] => b9386070 But I would like to have even smaller and knowing that it will be unique. Any help would be pretty much appreciated :) 回答1: You are confusing two

Random ids in sqlalchemy (pylons)

由 余生颓废 提交于 2019-12-09 06:14:21
问题 I'm using pylons and sqlalchemy and I was wondering how I could have some randoms ids as primary_key. 回答1: the best way is to use randomly generated UUIDs: import uuid id = uuid.uuid4() uuid datatypes are available natively in some databases such as Postgresql (SQLAlchemy has a native PG uuid datatype for this purpose - in 0.5 its called sqlalchemy.databases.postgres.PGUuid ). You should also be able to store a uuid in any 16 byte CHAR field (though I haven't tried this specifically on MySQL

Delphi UUID generator

由 旧时模样 提交于 2019-12-09 04:27:55
问题 Does Delphi have anything built-in to generate UUIDs? 回答1: program Guid; {$APPTYPE CONSOLE} uses SysUtils; var Uid: TGuid; Result: HResult; begin Result := CreateGuid(Uid); if Result = S_OK then WriteLn(GuidToString(Uid)); end. Under the covers CreateGuid() calls one of the various APIs, depending on the platform. For example on Windows, it nowadays calls UuidCreate . 回答2: Also, if you need a GUID for an interface declaration, hit ctrl + shift + g in the code editor to insert a GUID at the

When would you use GUIDs as primary keys? [duplicate]

由 不打扰是莪最后的温柔 提交于 2019-12-09 04:25:37
问题 This question already has answers here : Closed 10 years ago . Possible Duplicate: Advantages and disadvantages of GUID / UUID database keys Are there any circumstances where it is essential to use GUIDs as primary keys in a SQL Server 2005/8 DB. For example, does the use of the MS Sync Framework force this, or data replication? 回答1: You would use guids as a key if you needed multiple databases synchronising via replication. Another reason to use guids is if you wanted to create rows on some

Output UUID in Go as a short string

由 纵饮孤独 提交于 2019-12-09 04:07:03
问题 Is there a built in way, or reasonably standard package that allows you to convert a standard UUID into a short string that would enable shorter URL's? I.e. taking advantage of using a larger range of characters such as [A-Za-z0-9] to output a shorter string. I know we can use base64 to encode the bytes, as follows, but I'm after something that creates a string that looks like a "word", i.e. no + and / : id = base64.StdEncoding.EncodeToString(myUuid.Bytes()) 回答1: A universally unique

How to identify unique users without using a login system (iOS)

由 谁说胖子不能爱 提交于 2019-12-08 19:15:52
问题 I need to have a way to identify the users of my app, but without having a login system. I looked into the UUID which gives me part of an answer to my problem, but as it's not the real UDID, it's not "really unique" : if the user re-installs the app, he gets a new UUID, and this can't work for me. Is there a way I can get the device serial number or something unique like that? Anything of the sort that i could get from the device without having the user to fill any fields. 回答1: You can try to
订阅 uuid