How to execute code based upon the result of a select statement

How do I execute a block of code, if the result of my select statement is true or false? See lines 6 through 13 below, where I have pseudo coded it.

-- I have a table named zoop with a column named Code
1    SET @CODE = RandomCode()
2    SET @COunter = 0
3     SET @ItemFound = 0
4     WHILE @Counter < 1000
5     BEGIN

6     SELECT IF zoop.Code = @CODE  THEN
7     -- Perform SQL
8     -- Perform SQL
10  ELSE
11     -- Perform SQL
12   -- Perform SQL
13    SET @CODE = RandomCode() -- Part of ELSE code bloc
 



14  SET @Counter = @Counter + 1 -- Always do this as the last line in the loop
15   END