variables

问题 What is the Oracle equivalent of this MS SQL Server notation? DECLARE @Variable INT SET @Variable = 1 回答1: In PL/SQL, you have a declare block: declare x integer := 1; ... begin ... end; If you are writing an SQL*Plus script, you use variable to declare a bind variable variable x integer := 1; It's also possible to define variables. 回答2: In PL/SQL: DECLARE a number; BEGIN a := 1; END; You can paste this code in SQLPlus to run it. 来源： https://stackoverflow.com/questions/2708888/create-variable

问题 sorry for a repetitive question, I've seen a few of these on this forum but none of the responses worked for me... I am building a basic login using php sessions, which I'm new at... login.php validates html login form and begins a session, setting variables: $_SESSION['login'] and $_SESSION['id] , then each page that requires a valid login uses require 'session.php'; which checks the $_SESSION['valid'] variable and redirects a user w/o proper login variable. The problem is when I logout

问题 I would like to take the value of an li ID attribute (which will be a userID), and use it as part of a string that I will eventually use as part of a variable name. I will use this variable name to create an array with. I understand the basics, but can't seem to find the right combination of jQuery/javascript to make this magic happen. jQuery('#user-list li').click(function() { var userID = jQuery(this).attr("id"); // i want to add the word array to the end of userID var theVariableName =

问题 I would like to take the value of an li ID attribute (which will be a userID), and use it as part of a string that I will eventually use as part of a variable name. I will use this variable name to create an array with. I understand the basics, but can't seem to find the right combination of jQuery/javascript to make this magic happen. jQuery('#user-list li').click(function() { var userID = jQuery(this).attr("id"); // i want to add the word array to the end of userID var theVariableName =

问题 I would like to take the value of an li ID attribute (which will be a userID), and use it as part of a string that I will eventually use as part of a variable name. I will use this variable name to create an array with. I understand the basics, but can't seem to find the right combination of jQuery/javascript to make this magic happen. jQuery('#user-list li').click(function() { var userID = jQuery(this).attr("id"); // i want to add the word array to the end of userID var theVariableName =

问题 here is the example how you do it with normal variables: SET _test=123456789abcdef0 SET _result=%_test:~-7% ECHO %_result% :: that shows: abcdef0 But what to do with variables with double percent at the begin (like %%A ), variables like this are needed in for loops: FOR /D %%d IN (c:\windows\*) DO ( echo %%d ) this works, but: FOR /D %%d IN (c:\windows\*) DO ( echo %%d:~-7% ) simply copies :~-7 into the echo command 回答1: The replace and substring syntax only works for variables not for

问题 here is the example how you do it with normal variables: SET _test=123456789abcdef0 SET _result=%_test:~-7% ECHO %_result% :: that shows: abcdef0 But what to do with variables with double percent at the begin (like %%A ), variables like this are needed in for loops: FOR /D %%d IN (c:\windows\*) DO ( echo %%d ) this works, but: FOR /D %%d IN (c:\windows\*) DO ( echo %%d:~-7% ) simply copies :~-7 into the echo command 回答1: The replace and substring syntax only works for variables not for

问题 In Javascript we don't have to declare a variable with var keyword before using it. We can straight away do things like myCount = 12; or myStr = "Hello"; (where myCount, myStr are not declared before). Any such usage, declares and initializes the variables in the 'global' scope. What could be the reasons for providing this feature? And is it a good standard at all? UPDATE: My question is not what the differences are between 'using a variable without declaring' and 'declaring and then using'

问题 I read many posts on forum about pointers, Assigned function, Free function, FreeAndNil function, etc... I already know Free function don't remove the pointer reference to an object assigned and FreeAndNil does it... All posts I read treat this subject considering Create method already was executed, or in other words, considering an object already created. My question is: Why Assigned function returns true for a uninitialized object variable ? Follow an example: procedure TForm1.FormCreate

问题 I would like to know that can I use my native language characters (or String) as JAVA variable names ? So, I had tested as below with Myanmar Unicode. public static void main(final String[] args) { String ဆဆဆ = "မောင်မောင်"; System.out.println("ကောင်းသောနေ.ပါ " + ဆဆဆ); } This code show my successful message as 'ကောင်းသောနေ.ပါ မောင်မောင်' . But in below code with another variable name ( it also my native language String )..... public static void main(final String[] args) { String တက်စတင်း =