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How do you create a random string that's suitable for a session ID in PostgreSQL?
... years old. Check out this for a totally different method using gen_random_uuid(): faster, more randomness, more efficiently stored in the database.
– Evan Carroll
Jan 12 '17 at 8:11
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Generating Guids in Ruby
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As of Ruby 1.9, uuid generation is built-in. Use the SecureRandom.uuid function.
For example:
require 'securerandom'
SecureRandom.uuid # => "96b0a57c-d9ae-453f-b56f-3b154eb10cda"
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第一个Hello,OS World操作系统 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...输出。
OS本身也是程序，它的运行也是如此，开机后从指定地址处（0x7c00），开始执行指令。先看看本节例子最终运行效果：
编译运行环境：
nasm：Inter x86汇编编译工具，用户将我们的汇编代码编译为二进制。（下载地址...
搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...就差那么一点点，一点点。。。
连接在mongos上，准备让指定的数据库、指定的集合分片生效。
#指定testdb分片生效
db.runCommand( { enablesharding :"testdb"});
#指定数据库里需要分片的集合和片键
db.runCommand( { shardcollection : "testd...
京东618：算法让UV价值提升200%+，用智能卖场缩短购物路径 - 更多技术 - 清...
...示，该项目基于大数据挖掘、人工智能等技术能力，通过搜索、推荐、智能卖场、揽客计划、智慧物流、智慧数据等多种产品形态，对京东现有系统，从架构层的基础设施、数据平台、计算分析，到业务层的精准营销、智慧选品...
VC窗口刷新InvalidateRect和UpdateWindow - C/C++ - 清泛网 - 专注C/C++及内核技术
...段是窗口的设备环境句柄，rcPaint字段是一个RECT结构，它指定了无效区域矩形的对角顶点（如果开始有一个((0,0),(40,40))，现在又来一个((20,20),(60,30))，那么拼接后就是((0,0),(60,40))），fErase字段如果为非零值，表示Windows在发送WM_PAIN...
How to find serial number of Android device?
...oogle's recommendations, I implemented a class that will generate a unique UUID for each device, using ANDROID_ID as the seed where appropriate, falling back on TelephonyManager.getDeviceId() as necessary, and if that fails, resorting to a randomly generated unique UUID that is persisted across app ...
IOException: read failed, socket might closed - Bluetooth on Android 4.3
...;
import java.lang.reflect.Method;
import java.util.List;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.util.Log;
public class BluetoothConnector {
private BluetoothSocketWra...
How do I create a unique ID in Java? [duplicate]
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Create a UUID.
String uniqueID = UUID.randomUUID().toString();
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The JPA hashCode() / equals() dilemma
... it. I let JPA implementation to change the field instead of the property.
UUID solution seems to be overkill. Why UUID if you have natural business id? I would after all set the uniqueness of the business id in the database. Why having THREE indexes for each table in the database then?
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