uuid

I am very much new to Linux programming. My questions are: Is there any way to read the UUID of a device or partition in Linux programmatically? Is there any C/C++ API for user-space applications? I found some commands sudo vol_id --uuid /dev/sda1 , sudo blkid and ls -l /dev/disk/by-uuid/ . But all of them are commands which need to run in a terminal. But I need to achieve this from a C/C++ program. Can some one help me with this problem. (FYI: I need to read UUID of the root filesystem ("/") where Linux has been installed.) Thank you in advance. The general approach would be: find out what

I need to generate unique record id for the given unique string. I tried using uuid format which seems to be good. But we feel that is lengthly. so we need to cutdown the uuid string 9f218a38-12cd-5942-b877-80adc0589315 to smaller. By removing '-' we can save 4 chars. What is the safest part to remove from uuid? We don't need universally unique id but we like to use uuid as a source but cut down strings. We need unique id specific to site/database (SQL Server/ADO.NET Data services). Any idea or sample from any language is fine Thanks in advance Spencer Ruport Why not instead just convert it to

Say you have a table: `item` With fields: `id` VARCHAR( 36 ) NOT NULL ,`order` BIGINT UNSIGNED NOT NULL And: Unique(`id`) And you call: INSERT INTO `item` ( `item`.`id`,`item`.`order` ) SELECT uuid(), `item`.`order`+1 MySql will insert the same uuid into all of the newly created rows. So if you start with: aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa, 0 bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb, 1 You'll end up with: aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa, 0 bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb, 1 cccccccc-cccc-cccc-cccc-cccccccccccc, 1 cccccccc-cccc-cccc-cccc-cccccccccccc, 2 How do I command MySql to create

How should a random number generator properly be implemented in REST? GET RANDOM/ or.. POST RANDOM/ The server returns a different random number each time. I can see arguments for both ways. I'd say this is the same as for a page returned that contains the current time - and many of these are done using GET. Abstractly, fetching a random number (or time) the server's state doesn't change - both time and random numbers can be described as an observation of an external event. E.g. http://random.org use atmospheric noise. GET seems most appropriate, although caching will need to be disabled via

目录 centos8已经发布了，下载了一个体验一下，新安装好的centos8默认网卡是没有启动的，安装好后需要先配置网络。在 /etc/sysconfig/network-scripts 目录下存放着网卡的配置文件，文件名称是 ifcfg- 网卡名称 。 一 修改配置文件 设置网络时首先打开配置文件，配置文件默认如下所示，如果使用dhcp自动获取ip，只需将 ONBOOT=no 修改为 ONBOOT=no 即可。 # 网卡配置文件按默认配置 TYPE=Ethernet PROXY_METHOD=none BROWSER_ONLY=no BOOTPROTO=dhcp DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no IPV6_ADDR_GEN_MODE=stable-privacy NAME=ens33 UUID=e4987998-a4ce-4cef-96f5-a3106a97f5bf DEVICE=ens33 ONBOOT=no #如果使用dhcp分配ip的话，只需要将这里no改为yes，然后重启网络服务就行 如果需要配置静态ip，则按照以下修改方法修改 TYPE=Ethernet PROXY_METHOD=none

//根据uuid 获取 apt报告信息 *getNotesByUid({ payload, callback }, { call, put }) { // payload 是个数组， 并发执行，参考redux-saga文档 let resArr = yield payload.map(item => { return call(getNotesByUuid,item.uuid) }) resArr = resArr.map((obj,index) => { if(obj.code === 0){ return { ...obj.data, uuid:payload[index].uuid } } return {...payload[index], nodata:true }; //获取失败 不显示 }) callback && callback(resArr); }, 来源： https://www.cnblogs.com/chengyunshen/p/11812038.html

I need to create a 64 bit unique integer in Java so that collision chances are low. The system is not distributed, so collisions between different computers are not a problem. Is there any way, we can create a 64 bit integer in Java which is always Unique? As of now I am using - long number = System.nanoTime(); Is this the right way to generate 64 bit Unique Integer in Java or is there anything else I can try? UPDATE:- How about doing this way? Will this be unique? UUID number = UUID.randomUUID(); long uniqueNumber = number.timestamp(); Peter Lawrey If you need the numbers to be unique in one

I want to generate guids to insert into a SQLite database (i.e. no support from the db itself). However, I would like to have control over certain properties: Orderedness for generating increasing guid values. Computer independence. The db is public and may/may not want guids to allow someone to trace data back to a specific machine. 'Enough' randomness. The guids are keys in the db which is going to be merged with a lot of other dbs and can get quite large, meaning that faking a guid like many algorithms do is no good. I can deal with using system specific APIs but please link both Windows

I have a table TestTable with columns ID as binary(16) and name as varchar(50) I've been trying to store an ordered UUID as PK like in this article Store UUID in an optimized way I see the UUID is saved in database as HEX (blob) So I want to save this ID from java but I am getting this error Data truncation: Data too long for column 'ID' at row 1 I am currently using the library sql2o to interact with mysql So basically this is my code String suuid = UUID.randomUUID().toString(); String partial_id = suuid.substring(14,18) + suuid.substring(9, 13) + suuid.substring(0, 8) + suuid.substring(19,