guid

Why is GUID attribute needed in the first place?

由 久未见 提交于 2019-12-17 18:43:07
问题 What is the necessity for the GUID attribute? why don't just let the compiler handle this automatically?! 回答1: If the compiler handled this automatically, you'd end up with one of two situations. A new GUID every time you compiled - since GUIDs are supposed to be published, this would fail. Collisions - if the GUID was the same every time, based on (say) a Hash of the name, multiple projects would end up using the same GUID for different purposes. The existing approach - an explicit GUID

Differentiate Guid and string Parameters in MVC 3

由 佐手、 提交于 2019-12-17 18:33:40
问题 Using the out-of-the-box method locators in ASP.NET MVC (3 or 4DP), is there a way to have the MVC framework differentiate between a string and Guid without needing to parse the parameter in the controller action? Usage examples would be for the URL http://[domain]/customer/details/F325A917-04F4-4562-B104-AF193C41FA78 to execute the public ActionResult Details(Guid guid) method, and http://[domain]/customer/details/bill-gates to execute the public ActionResult Details(string id) method. With

Convert UUID 32-character hex string into a “YouTube-style” short id and back

由 佐手、 提交于 2019-12-17 17:27:09
问题 I'm assigning all my MongoDB documents a GUID using uuid.uuid1(). I want a way I can derive an 11 character, unique, case-sensitive YouTube-like ID, such as 1_XmY09uRJ4 from uuid's resulting hex string which looks like ae0a0c98-f1e5-11e1-9t2b-1231381dac60 I want to be able to match the shortened ID to the hex and vice-versa, dynamically without having to store another string in the database. Does anyone have some sample code or can point me in the direction of the module or formula that can

Should I get rid of clustered indexes on Guid columns

由 ☆樱花仙子☆ 提交于 2019-12-17 15:53:30
问题 I am working on a database that usually uses GUIDs as primary keys. By default SQL Server places a clustered index on primary key columns. I understand that this is a silly idea for GUID columns, and that non-clustered indexes are better. What do you think - should I get rid of all the clustered indexes and replace them with non-clustered indexes? Why wouldn't SQL's performance tuner offer this as a recommendation? 回答1: A big reason for a clustered index is when you often want to retrieve

WIX Autogenerate GUID *?

由 流过昼夜 提交于 2019-12-17 15:47:19
问题 Let's say I generate my WIX XML file with a Product Id of *. Also for each Component GUID I use a *. <Product Id="*" Name="xxx" Language="1033" Version="1.0.0.0" Manufacturer="xxx" UpgradeCode="xxx"> Behind the scenes is the * spinning a unique GUID each time I compile my WIX Installer? Let's say I have version 1.0.0 installed a machine. Then I recompile my WIX Installer to version 1.0.1. When I go to install 1.0.1 how does WIX know that 1.0.0 is already installed and thus will remove all

Would it help to add index to BIGINT column in MySQL?

由 ≡放荡痞女 提交于 2019-12-17 10:01:17
问题 I have a table that will have millions of entries, and a column that has BIGINT(20) values that are unique to each row. They are not the primary key, but during certain operations, there are thousands of SELECT s using this column in the WHERE clause. Q: Would adding an index to this column help when the amount of entries grows to the millions? I know it would for a text value, but I'm unfamiliar with what an index would do for INT or BIGINT . A sample SELECT that would happen thousands of

Would it help to add index to BIGINT column in MySQL?

由 假装没事ソ 提交于 2019-12-17 10:01:01
问题 I have a table that will have millions of entries, and a column that has BIGINT(20) values that are unique to each row. They are not the primary key, but during certain operations, there are thousands of SELECT s using this column in the WHERE clause. Q: Would adding an index to this column help when the amount of entries grows to the millions? I know it would for a text value, but I'm unfamiliar with what an index would do for INT or BIGINT . A sample SELECT that would happen thousands of

ASP.NET如何防止页面重复提交

由 荒凉一梦 提交于 2019-12-17 06:34:58
1. System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append("if (typeof(Page_ClientValidate) == 'function') { if (Page_ClientValidate() == false) { return false; }}");//保证验证函数的执行 sb.Append("if(window.confirm('提醒：您确定要进行此次操作吗？')==false) return false;");//自定义客户端脚本 sb.Append("disableOtherSubmit();");// disable所有submit按钮 sb.Append(ClientScript.GetPostBackEventReference(this.btnSubmit,null));//用__doPostBack来提交，保证按钮的服务器端click事件执行 sb.Append(";"); btnSubmit.Attributes.Add("onclick", sb.ToString()); 2. 捕获回车事件时，表单重复提交问 ... 今天在页面中捕获回车事件，发现提交表单时，会重复提交，最后在方法后面加一个return false，问题才得以解决。

How can I generate GUIDs in Excel?

由 这一生的挚爱 提交于 2019-12-17 04:59:41
问题 I have an excel file with one order on each row, and I want each order to have a unique identifier, so there will be a Unique ID column. Every time I fill a row, I want Excel to automatically populate the Unique ID column for me. I did some research and was pointed in the direction of GUIDs. I found the following code: Function GenGuid() As String Dim TypeLib As Object Dim Guid As String Set TypeLib = CreateObject("Scriptlet.TypeLib") Guid = TypeLib.Guid ' format is {24DD18D4-C902-497F-A64B

How can I generate GUIDs in Excel?

由 时光怂恿深爱的人放手 提交于 2019-12-17 04:58:25
问题 I have an excel file with one order on each row, and I want each order to have a unique identifier, so there will be a Unique ID column. Every time I fill a row, I want Excel to automatically populate the Unique ID column for me. I did some research and was pointed in the direction of GUIDs. I found the following code: Function GenGuid() As String Dim TypeLib As Object Dim Guid As String Set TypeLib = CreateObject("Scriptlet.TypeLib") Guid = TypeLib.Guid ' format is {24DD18D4-C902-497F-A64B
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