variables

问题 In my ColdFusion code, I have made it a habit to always treat the variables scope as my default scope (i.e., when another scope doesn't fit). My understanding is that this improves efficiency, since the ColdFusion processor doesn't have to spend cycles determining the scope in which the variable is contained. However, I've always been annoyed by how verbose this makes my code. So, my question is, realistically, is explicitly scoping every variable worth the verbosity? I understand that each

问题 Is it possible to set the result from a prepared statement into a variable? I am trying to create the following stored procedure but it is failing: ERROR 1064 (42000) at line 31: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'stmt USING @m, @c, @a; DROP PROCEDURE IF EXISTS deleteAction; DELIMITER $$ CREATE PROCEDURE deleteAction( IN modul CHAR(64), IN controller CHAR(64), IN actn CHAR(64)) MODIFIES SQL

问题 Implementing dynamic scoping, I was using local . Then I came across this post, which says the following: Why have local at all? The answer is 90% history. Early versions of Perl only had global variables. local was very easy to implement, and was added to Perl 4 as a partial solution to the local variable problem. ...never use local. Is its use deprecated, or discouraged? If yes, what is the alternative? 回答1: The post you linked to is misleading, or at least incomplete. It is true that you

问题 This question already has answers here : Closed 9 years ago . Possible Duplicates: Is a variable named i unacceptable? What is an ideal variable naming convention for loop variables? Coming from a C background I've always used int i for generic loop variables. Of course in big nested loops or other complex things I may use a descriptive name but which one had you rather see? int i; for(i=0;i<Controls.Count;i++){ DoStuff(Controls[i]); } or int index; for(index=0;index<Controls.Count;index++){

问题 This question already has answers here : Closed 9 years ago . Possible Duplicates: Is a variable named i unacceptable? What is an ideal variable naming convention for loop variables? Coming from a C background I've always used int i for generic loop variables. Of course in big nested loops or other complex things I may use a descriptive name but which one had you rather see? int i; for(i=0;i<Controls.Count;i++){ DoStuff(Controls[i]); } or int index; for(index=0;index<Controls.Count;index++){

问题 I'm working on project that need do call the same method several times, but with different arguments. Can I use the same variable or do I have to declare another variable? For example: HttpWebRequest req = (HttpWebRequest)WebRequest.Create(domains["ServiceLogin"]); req.Method = "GET"; req.Referer = "Mozilla/5.0 (X11; Linux i686; rv:6.0) Gecko/20100101 Firefox/6.0"; req.CookieContainer = new CookieContainer(); HttpWebResponse response = (HttpWebResponse)req.GetResponse(); CookieCollection

问题 Is there a way to list all Variables of a class in Swift? For example: class foo { var a:Int? = 1 var b:String? = "John" } I want to list it like this: [a:1, b:"John"] 回答1: The following should use reflection to generate the list of members and values. See fiddle at http://swiftstub.com/836291913/ class foo { var a:Int? = 1 var b:String? = "John" } let obj = foo() let reflected = reflect(obj) var members = [String: String]() for index in 0..<reflected.count { members[reflected[index].0] =

问题 Is there a way to list all Variables of a class in Swift? For example: class foo { var a:Int? = 1 var b:String? = "John" } I want to list it like this: [a:1, b:"John"] 回答1: The following should use reflection to generate the list of members and values. See fiddle at http://swiftstub.com/836291913/ class foo { var a:Int? = 1 var b:String? = "John" } let obj = foo() let reflected = reflect(obj) var members = [String: String]() for index in 0..<reflected.count { members[reflected[index].0] =

问题 I am trying to split a file into different smaller files depending on the value of the fifth field. A very nice way to do this was already suggested and also here. However, I am trying to incorporate this into a .sh script for qsub, without much success. The problem is that in the section where the file to which output the line is specified, i.e., f = "Alignments_" $5 ".sam" print > f , I need to pass a variable declared earlier in the script, which specifies the directory where the file

问题 I am trying to split a file into different smaller files depending on the value of the fifth field. A very nice way to do this was already suggested and also here. However, I am trying to incorporate this into a .sh script for qsub, without much success. The problem is that in the section where the file to which output the line is specified, i.e., f = "Alignments_" $5 ".sam" print > f , I need to pass a variable declared earlier in the script, which specifies the directory where the file