declare

问题 I am a little bit confused by the PHP function declare . What exactly is a single tick? I thought a tick equals one line of code? But if I use: function myfunc() { print "Tick"; } register_tick_function("myfunc"); declare(ticks=1) { echo 'foo!bar'; } The script prints: "Tick" 2 Times?? 回答1: You get a tick for each line ; and each block {} Try that: declare(ticks=1) echo 'foo!bar'; No block, no extra tick. declare(ticks=1) {{ echo 'foo!bar'; }} More extraneous blocks = more ticks. PS: by the

问题 My question is a very simple one. Normally, when declaring some variable, you put its type before it, like: int a; a function pointer may have type like: int(*)(int,int) , in case we point to a function that takes two integers and returns an integer. But, when declaring such a pointer, its identifier is not after the type, like: int(*)(int,int) mypointer; instead, you must write the identifier in the middle: int(*mypointer)(int,int); why is this so? Sorry, I know it\'s an embarrassingly easy

问题 Below is an example of using variables in SQL Server 2000. DECLARE @EmpIDVar INT SET @EmpIDVar = 1234 SELECT * FROM Employees WHERE EmployeeID = @EmpIDVar I want to do the exact same thing in Oracle using SQL Developer without additional complexity. It seems like a very simple thing to do, but I can\'t find a simple solution. How can I do it? 回答1: I am using the SQL-Developer in Version 3.2. The other stuff didn't work for me, but this did: define value1 = 'sysdate' SELECT &&value1 from dual;