So you can write code like this: void f( const string & s ) { } f( “foobar” ); Although strictly speaking what is actually happening here is not the literal being bound to a const reference – instead a temprary string object is created: string( “foobar” ); and this nameless string is bound to … Read more
Declaring a function with a variable but arbitrary name like this is not possible without getting your hands dirty with eval() or include(). I think based on what you’re trying to do, you’ll want to store an anonymous function in that variable instead (use create_function() if you’re not on PHP 5.3+): $variableA = function() { … Read more
Their name is global variables. There are several different references. You can get a full list by calling the method Kernel#global_variables puts global_variables Ruby also includes a file called “English.rb” in the standard library which provides an in-depth explanation of several global variables. Also, there’s (an archived version of) “Cryptic Ruby Global Variables and Their … Read more
A. Use the global keyword to import from the application scope. $var = “01-01-10”; function checkdate(){ global $var; if(“Condition”){ $var = “01-01-11”; } } checkdate(); B. Use the $GLOBALS array. $var = “01-01-10”; function checkdate(){ if(“Condition”){ $GLOBALS[‘var’] = “01-01-11”; } } checkdate(); C. Pass the variable by reference. $var = “01-01-10”; function checkdate(&$funcVar){ if(“Condition”){ $funcVar … Read more
In the first case the global keyword is pointless, so that is not correct. Defining a variable on the module level makes it a global variable, you don’t need the global keyword. The second example is correct usage. However, the most common usage for global variables are without using the global keyword anywhere. The global … Read more
Value vis-a-vis Reference Types Variables in C# are in 1 of 2 groups. Value types or Reference types. Types like int and DateTime are value types. In contrast, any class you create is a reference type. C# strings are also a reference type. Most things in the .NET framework are reference types. Parts of a … Read more
Try this instead, remove the SelectCommand property and SelectParameters: <asp:SqlDataSource ID=”SqlDataSource1″ runat=”server” ConnectionString=”<%$ ConnectionStrings:itematConnectionString %>”> Then in the code behind do this: SqlDataSource1.SelectParameters.Add(“userId”, userId.ToString()); SqlDataSource1.SelectCommand = “SELECT items.name, items.id FROM items INNER JOIN users_items ON items.id = users_items.id WHERE (users_items.user_id = @userId) ORDER BY users_items.date DESC” While this worked for me, the following code also … Read more
Pass parameter value like this – ‘AA,BB,CC’. Then, it is enough to use FIND_IN_SET function – SELECT product_id, product_price FROM product WHERE FIND_IN_SET(product_type, param);