大约有 240 项符合查询结果（耗时：0.0072秒） [XML]
Guid.NewGuid() vs. new Guid()
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An empty UUID is very useful indeed. It makes a great special value.
– Jon Hanna
Aug 13 '12 at 16:21
105
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Does every Core Data Relationship have to have an Inverse?
... alternative solution, as discussed in the comments, is to create your own UUID property on the target (in the example here, every Page would have an id that is a UUID), store that as a property (currentPage just stores a UUID as an Attribute in Book, rather than being a relationship), and then writ...
BLE（二）信道&数据包&协议栈格式 - 创客硬件开发 - 清泛IT社区，...
...们常说的“温度”、“湿度”等人类可识别的术语，通过UUID进行区分。Attribute Handle是一个16-bit的数值，用作唯一识别Attribute server上的所有Attribute。Attribute Handle的存在有如下意义：
一个server上可能存在多个相同type的Attribute，...
creating a random number using MYSQL
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RAND(), UUID(), NOW() are indeterministic functions. The calling of such functions should be avoid from being written into the bin log for replication. For example. INSERT INTO t SET ID=UUID(); will cause the value of the ID fields t...
Hibernate JPA Sequence (non-Id)
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I fixed the generation of UUID (or sequences) with Hibernate using @PrePersist annotation:
@PrePersist
public void initializeUUID() {
if (uuid == null) {
uuid = UUID.randomUUID().toString();
}
}
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Hash function that produces short hashes?
...thon again like the accepted answer):
import base64
import hashlib
import uuid
unique_id = uuid.uuid4()
# unique_id = UUID('8da617a7-0bd6-4cce-ae49-5d31f2a5a35f')
hash = hashlib.sha1(str(unique_id).encode("UTF-8"))
# hash.hexdigest() = '882efb0f24a03938e5898aa6b69df2038a2c3f0e'
result = base64.b...
How to check task status in Celery?
...t like this:
import celery
from celery_app import add
from celery import uuid
task_id = uuid()
result = add.apply_async((2, 2), task_id=task_id)
Now you know exactly what the task_id is and can now use it to get the AsyncResult:
# grab the AsyncResult
result = celery.result.AsyncResult(task_i...
【iOS】有关苹果iOS App的一些进展、BluetoothLE蓝牙拓展等 - App Inventor...
...和安卓不一样，iOS 使用由 iOS 设备和 BLE 设备组合生成的 UUID 来识别 BLE 设备，而不是像 Android 那样使用 MAC 地址
此外，iOS 与 Android 的一个重要区别在于，iOS 使用由 iOS 设备和 BLE 设备组合生成的 UUID 来识别 BLE 设备，而不是像 An...
iOS Ad Hoc 和 App Store 区别 - App应用开发 - 清泛IT社区，为创新赋能！
前者：本地有限设备测试，要提前添加设备uuid，有效期7天。生成ipa，开发者权限打开的手机才能扫描下载安装。
后者：直接发布AppStore审核，无需添加设备，需要特殊密码。不生产ipa，直接走发布审核流程。（编译窗中的Short ...
Distributed sequence number generation?
...e unique IDs on the clients themselves, using an approach derived from how UUIDs and Snowflake's IDs are made. There are multiple options, but something along the lines of:
The most significant 40 or so bits: A timestamp; the generation time of the ID. (We're using the most significant bits for th...