variables

问题 Within my XSLT spreadsheet, I need to define an xsl:variable with one value or another depending on the value of an xml node. The code just below shows what I'm trying to do. I would like to define multiple variables this way. A major issue is that in order to choose a variable value based on the node value of each item, the choosing must be done within xsl:foreach, and whenever I try to define a variable within xsl:foreach it shows an error. <xsl:for-each select="WORKS/item"> <xsl:variable

问题 Within my XSLT spreadsheet, I need to define an xsl:variable with one value or another depending on the value of an xml node. The code just below shows what I'm trying to do. I would like to define multiple variables this way. A major issue is that in order to choose a variable value based on the node value of each item, the choosing must be done within xsl:foreach, and whenever I try to define a variable within xsl:foreach it shows an error. <xsl:for-each select="WORKS/item"> <xsl:variable

问题 I need to know the default values of variables in ruby. Global Variables: nil Instance Variables: ? Class Variables: ? Local Variables: ? I looked here, but all I could find is that global variables have a nil value. 回答1: You assign a local variable value at first assignment: local = 1 local1 + local # NameError: undefined local variable or method `local1' for main:Object Class variables are similar, if you use them without initialization, you get an error: class A @@a end # NameError:

问题 (true or false) The space for a local variable that is declared in the body of the loop is allocated whenever the loop body is executed and deallocated when the body finishes. The answer to this question is false. But why? 回答1: The statement is false because local variable space is not allocated and deallocated. It exists on the stack and is reserved when the method is entered. To see how stack space is used, write a small test program with: public static void test() { { int a = 1; long b = 2

问题 (true or false) The space for a local variable that is declared in the body of the loop is allocated whenever the loop body is executed and deallocated when the body finishes. The answer to this question is false. But why? 回答1: The statement is false because local variable space is not allocated and deallocated. It exists on the stack and is reserved when the method is entered. To see how stack space is used, write a small test program with: public static void test() { { int a = 1; long b = 2

问题 I want to use a registry as a column name but the registry is variable and I don't know when it changes. Example: Config (field) = 'Medicine' FieldContent (another field) = 'Remedy name' A want to make this: Medicine (use content of Config as column name) = 'Remedy Name' (as registry) What have I tried? SET @CONFIG = SELECT CONFIG; SELECT FIELDCONTENT AS @CONFIG FROM TABLENAME; MySql says that I can't use a variable as column name. There's other way? actual Config Content Medicine RemedyName

问题 This question's purpose is to only gain knowledge or information for me and many like me. So my question is: Is it necessary to Initialize / Declare a variable before a loop or a function? Asking this question is for my confusion because whether I initialize / declare variable before or not my code still works. I'm sharing a demo code for what I actually mean: $cars = null; foreach ($build as $brand) { $cars .= $brand . ","; } echo $cars; OR foreach ($build as $brand) { $cars .= $brand . ",";

问题 This question's purpose is to only gain knowledge or information for me and many like me. So my question is: Is it necessary to Initialize / Declare a variable before a loop or a function? Asking this question is for my confusion because whether I initialize / declare variable before or not my code still works. I'm sharing a demo code for what I actually mean: $cars = null; foreach ($build as $brand) { $cars .= $brand . ","; } echo $cars; OR foreach ($build as $brand) { $cars .= $brand . ",";

问题 Alright, this is my main code: require "checkpassword.php"; require "mysqllogininfo.php"; # Validate password if (!validatePassword($_GET["password"])) { return; } # Get variables $uuid = $_GET["uuid"]; if (preg_match('/^\d+$/',$_GET["rank"]) == false) { die("Rank must be integer"); } $rank = $_GET["rank"]; # Validate UUID if ($uuid == null) { die ("Supply uuid"); } # Validate rank if ($rank == null) { die ("Supply rank"); } else if ($rank < 0 || $rank > 6) { die ("Invalid rank"); } # Load

问题 Alright, this is my main code: require "checkpassword.php"; require "mysqllogininfo.php"; # Validate password if (!validatePassword($_GET["password"])) { return; } # Get variables $uuid = $_GET["uuid"]; if (preg_match('/^\d+$/',$_GET["rank"]) == false) { die("Rank must be integer"); } $rank = $_GET["rank"]; # Validate UUID if ($uuid == null) { die ("Supply uuid"); } # Validate rank if ($rank == null) { die ("Supply rank"); } else if ($rank < 0 || $rank > 6) { die ("Invalid rank"); } # Load