guid

I know we can INSERT INTO "Table1" VALUES(X'57A00F3015310D4081AD4ADEF3EBDB5E'); But this little endian format is difficult to compare to the original Guid 300FA057-3115-400D-81AD-4ADEF3EBDB5E How to use the original Guid in the SQL statement instead of the little endian one? If you want to easily compare to the original without converting then store it as text. It'll take more storage space and will be slower to read/write/compare, but it'll be more human readable. I'm having similar frustrations and am experimenting with a querying tool to do conversion for me. For now I get by with something

We're working with Fluent NHibernate 1.2 and our primary key is a guid saved in a nvarchar(32) column, working with Oracle 11gr2. How can we make this work? (making an automatic conversion...) Thanks ahead, random programmer... UPDATE: forgot to mention, the guid is saved WITHOUT dashes ... Update: You will have to implement your own IUserType to handle the dashless Guids. You can read about it here: http://dotnet.dzone.com/articles/understanding-nhibernate-type The detail below is now irrelevant to the question but I'll keep it here for future reference for people to find. Using Guids

According to Microsoft's documentation on NEWSEQUENTIALID , the output of NEWSEQUENTIALID is predictable. But how predictable is predictable? Say I have a GUID that was generated by NEWSEQUENTIALID , how hard would it be to: Calculate the next value? Calculate the previous value? Calculate the first value? Calculate the first value, even without knowing any GUID's at all? Calculate the amount of rows? E.g. when using integers, /order?id=842 tells me that there are 842 orders in the application. Below is some background information about what I am doing and what the various tradeoffs are. One

Would this be reliable for using as an ID for data storage(SQL Server)? I would use a guid but I prefer a numeric value. Would this be reliable for using as an ID for data storage(SQL Server)? No. GUIDs are 128-bit but hashcodes are 32-bit. Therefore, there are necessarily collisions. It may be unlikely that you ever encounter one, but you are not guaranteed to never encounter one. What you want for reliability is a guarantee that you never encounter a collision. If you insist on using Guid.NewGuid().GetHashCode() then you need to add logic to detect collisions. GUIDs do have advantages (and

1、bootstrap-fileinpu的简单介绍 在前面的随笔，我介绍了Bootstrap-table表格插件的具体项目应用过程，本篇随笔介绍另外一个Bootstrap FieInput插件的使用，整合两者可以实现我们常规的Web数据导入操作，导入数据操作过程包括有上传文件，预览数据，选择并提交记录等一系列操作。 关于这个插件，我在早期随笔《 Bootstrap文件上传插件File Input的使用 》也做了一次介绍，这是一个增强的 HTML5 文件输入控件，是一个 Bootstrap 3.x 的扩展，实现文件上传预览，多文件上传等功能。 bootstrap-fileinput源码： https://github.com/kartik-v/bootstrap-fileinput bootstrap-fileinput在线API： http://plugins.krajee.com/file-input bootstrap-fileinput Demo展示： http://plugins.krajee.com/file-basic-usage-demo 这个插件主要是介绍如何处理图片上传的处理操作，原先我的Excel导入操作使用的是Uploadify插件，可以参考我随笔《 附件上传组件uploadify的使用 》，不过这个需要Flash控件支持，在某些浏览器（如Chrome

I have a table with an auto-increment ID field as shown below. +------------+-------------------------------------+ | company_id | name | +------------+-------------------------------------+ | 1 | International Client | | 2 | Oracle | | 3 | test | | 4 | testabc | | 5 | testdef | | 6 | abcd | +------------+-------------------------------------+ I want to update the ID column to be a GUID using the uuid() function. Additionally, how do I update the foreign key references to the correct GUID? Use triggers. CREATE TABLE `tbl_test` ( `GUID` char(40) NOT NULL, `Name` varchar(50) NOT NULL, PRIMARY

Is this even possible? I don't even think it is, but I saw some code that was trying to do it. However, my unit tests showed that it was not working. I did see some similar thoughts: Converting GUID to Integer and Back Converting System.Decimal to System.Guid Just for clarification. The Guid creation is outside of my control; therefore, I can't just store the value in one of the Guid sets. A GUID is 16 bytes long. A "long" is often understood as being 64 bits (i.e. 8 bytes) long. You cannot convert between those without losing or providing extra data. A GUID can never fit a long, because, as I

My web application operates only over SSL and sets a time limited cookie for each user after they successfully login with a username and password. The biggest weaknesses in the system are one compromising an existing user's cookie. And two guessing a session ID GUID. I know of mechanisms for the first weakness but I'm wondering how much I need to worry about the chance of an attacker guessing a session ID GUID based on a GUID they have previously obtained by logging into an account they have set up? The web server in this case is Windows 2003 and the GUIDs are being generated with .Net 3.5.