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Newbie - Nested If statements in stored procedure syntax?

Posted on 2008-10-28
Last Modified: 2012-05-05
What would a nested if statement look like in a stored procedure:

01 If A
02     If B
03        Let x = x + 1
04     Endif B
05     Let y = y + 1
06     Else A
07      If C
08          If D
09              Let z = z + 1
09          Else D
10              Let z = z - 1
11          End D
12      Let ab =  ab + 1
13      End C
14    End A

The original VBA code nests to 9 levels.
Question by:bparkbpark
LVL 17

Accepted Solution

Daniel Reynolds earned 250 total points
ID: 22827068
something like the following

   IF B
        SET x = x + 1
     SET y = y + 1
       IF C
             IF D
                    SET z = z + 1
              IF NOT D
                    Set z = z - 1
               SET ab = ab + 1
LVL 39

Assisted Solution

BrandonGalderisi earned 250 total points
ID: 22827432
The important thing to note that there is no "end if" as in other languages.  And the use of "IF" means that if the condition is met, then execute the NEXT COMMAND.  If the NEXT COMMAND is a begin, then it treats that as a code block and executes until the matching END.

Let's look at these two examples.

In example 1, @b will ONLY be set to 2 if @a=1, but @c will be set to 3 regardless because the condition "if @a=1" only determines whether the "set @b=2" is executed
--example 1
If @A=1
  set @b=2
set @c=3

In this example, both set operations will be executed because they exist inside of a begin/end block.
--example 2
if @A=1
set @b=2
set @c=3

In this example, either @b will be set to 2, or @c will be set to 3.  Both lines will not be executed.
--example 3
if @a=1
  set @b=2
  set @c=3

In this example.  If @a=1, then @b will be set to 2.  If @a is not equal to 1, then @b will be set to 123, and @c to 3.
--example 4
if @a=1
  set @b=2
  set @b=123
  set @c=3

--end examples

Hope this clears up how to nest if/else statements

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