uuid

Python docs states that uuid1 uses current time to form the uuid value. But I could not find a reference that ensures UUID1 is sequential. >>> import uuid >>> u1 = uuid.uuid1() >>> u2 = uuid.uuid1() >>> u1 < u2 True >>> But not always: >>> def test(n): ... old = uuid.uuid1() ... print old ... for x in range(n): ... new = uuid.uuid1() ... if old >= new: ... print "OOops" ... break ... old = new ... print new >>> test(1000000) fd4ae687-3619-11e1-8801-c82a1450e52f OOops 00000035-361a-11e1-bc9f-c82a1450e52f UUIDs Not Sequential No, standard UUIDs are not meant to be sequential. Apparently some

If I have a string "key:<String || UUID>" is there a way where I can extract the string and differentiate of the part after : is a string or a UUID? Example: in this key:863864947148451183L and key:1234 May be by using the size of a UUID or the number of bytes? The only foolproof way is to use UUID.fromString(yourString); It will return an java.lang.IllegalArgumentException: Invalid UUID string: "someString" Handle the exception. The javadoc explains the UUID format. Victor Using exceptions to replace logic is never a good option. In this case the use of the exception is also erroneous,

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I want a column to default to a GUID, so if I am doing an insert and I don't explicitly set the value, I want it to default to a new GUID value. how can I do this? Being that UUID() isn't accepted as a DEFAULT constraint, you need to use a trigger. This one sets the value for the NEW_TABLE.uuid column: delimiter $$ CREATE DEFINER=`root`@`localhost` TRIGGER `example`.`newid` BEFORE INSERT ON `example`.`new_table` FOR EACH ROW BEGIN SET NEW.`uuid` = UUID(); END $$ pospi Previous answer is not quite right - you've got to be careful with triggers... they will actually overwrite any default value

I'm working with a C project that's using DirectX and I've run into a problem. Certain DX calls require a IID object, typically generated with __uuidof . One thing this is required for is creating a RenderTargetView. The DirectX samples/tutorials do this: ID3D11Texture2D* pBackBuffer = NULL; hr = g_pSwapChain->GetBuffer( 0, __uuidof( ID3D11Texture2D ), ( LPVOID* )&pBackBuffer ); When I try to call __uuidof in my C code, I get an compiler error: Error 19 error C4233: nonstandard extension used : '__uuidof' keyword only supported in C++, not C . DirectX has a C interface, so I imagine there must

vmware 下找不到ifcfg-eth0的问题 http://www.linuxdiyf.com/viewarticle.php?id=90924 在windowXP下安装了suse linux，在vmware下选择了host-only方式与主机通信。 使用host-only方式与主机通信，vmware使用的是VMware Network Adapter VMnet1虚拟网卡，查看该网卡的IP是 192.168.174.1。 在虚拟机下面的linux下遇到了一下几个问题： 1、找不大 eth0网卡，也就连不上网络。症状是ifconfig以后只现实lo，不显示eth0。 解决方法： ifconfig eth0 up。这样ifconfig以后就显示了eth0。 找到eth0以后，再运行ifconfig eth0 192.168.174.2 netmask 255.255.255.0。即可与主机通信。 2、经过上面步骤是找到了eth0，可是重启以后又没有了。 解决方法： cd /etc/sysconfig/network/ cp ifcfg-lo ifcfg-eth0 vim ifcfg-eth0 修改配置如下 IPADDR=192.168.174.2 NETMASK=255.255.255.0 NETWORK=192.168.174.0 BROADCAST=192.168.174

How can I generate GUIDs and UUIDs in R? I would like to be able to generate GUIDs based on the hardware etc. of the machine running the rsession. As a fallback, however, I would be happy to create UUIDs that comply with rfc4122. Is there a package that can create GUIDs? Otherwise, does someone have some RFC4122 compatible UUID code lying about? The optimal choice for this now is the uuid package. It consists of one function ( UUIDgenerate ) that doesn't rely on R's internal random number generators and so doesn't suffer any consequences from using set.seed in a session as @thelatemail's

Would like to populate some static test data via a CQLsh script. This doesn't work: (device_id is UUID) insert into devices (device_id, geohash,name, external_identifier, measures, tags) values ('c37d661d-7e61-49ea-96a5-68c34e83db3a','9q9p3yyrn1', 'Acme1', '936', {'aparPower','actPower','actEnergy'},{'make':'Acme'}); Bad Request: Invalid STRING constant (c37d661d-7e61-49ea-96a5-68c34e83db3a) for device_id of type uuid I can't seem to find any CQL function to convert to proper type. Do I need to do this from a python script? Thanks, Chris You shouldn't put the quotes around the UUID to stop it

环境： CentOS Linux release 7.7.1908 (Core) PHP 7.3.11 UUID Extention 1.0.4 感觉上PHP对UUID的支持似乎不是很上心，PECL中的UUID扩展仅仅是对libuuid的打包，并没有像其他语言那样直接提供完整的UUID实现。由于libuuid仅仅提供了版本1和版本4的UUID，所以……，开心一点，这两个就够用了。 uuid_create( [int $uuid_type = UUID_TYPE_DEFAULT] ) : string $uuid_type 　　如下常量之一： 　　　　 UUID_TYPE_DEFAULT // 0 　　　　 UUID_TYPE_TIME // 1 　　　　 UUID_TYPE_DCE // 4 　　　　 UUID_TYPE_NAME // 1 　　　　 UUID_TYPE_RANDOM // 4 　　libuuid提供了UUID版本1和版本4的实现，也只定义了 UUID_TYPE_DCE_TIME 和 UUID_TYPE_DCE_RANDOM 两个常量。PHP的UUID扩展中，常量是通过映射libuuid的常量定义的。所以，虽然扩展中根据UUID标准定义了4个常量名，但对于当前版本的libuuid，也只能映射到两个常量。 UUID_TYPE_TIME 映射为libuuid的常量

I just wrote this code to convert a GUID into a byte array. Can anyone shoot any holes in it or suggest something better? public static byte[] getGuidAsByteArray(){ UUID uuid = UUID.randomUUID(); long longOne = uuid.getMostSignificantBits(); long longTwo = uuid.getLeastSignificantBits(); return new byte[] { (byte)(longOne >>> 56), (byte)(longOne >>> 48), (byte)(longOne >>> 40), (byte)(longOne >>> 32), (byte)(longOne >>> 24), (byte)(longOne >>> 16), (byte)(longOne >>> 8), (byte) longOne, (byte)(longTwo >>> 56), (byte)(longTwo >>> 48), (byte)(longTwo >>> 40), (byte)(longTwo >>> 32), (byte)