ALV Questions

Question

<b>Hi,
   Please answer the following questions.
1.  What is the difference b/w classical report and ALV  report and in classical report can we produce output more than 255 characters?
2.  Did you used classes to create ALV reports  and how is superior over using    function modules in ALV report generation?
3.  If we don't know the  exact number of blocks to be generated then Can we generate the output with different number of blocks in 
     ALV   reports?
4.  In report if we have write statements in initialization, top of page and in start of selection then which event is first excuted and what
     is  the output?
5.  In interactive report what is the use of exit key word?
6.  what are nested structures and deep structures?
7.  how can we write BDC program to  upload  data from  CSV, XL, TAB delimeter type flat files?
8.  In BDC if the flat file consist of header and multiple line items then how to upload the load, does we create a single internal table for
     both header and body or different internal tables?
9.  In call transaction and session method which method is prefered one?
10. why can't we use call transaction method to upload large amount of data?
11.what is the use of standard text in sap scripts, why can't we hard code the same information in form itself?
12.what are user exits and how can we create them?
13. can we modify  the  sap provided  code?
14. what are oss notes?
15. what are the different types of performance techniques?
16. can we do modifications on output of   ALV reports, how?
17. what are the classes that are used in ALV reporting?
Thanks
Manju.
Points will be rewarded.</b>

Answer 1

Hi manju
1.Diff b/w classical and interactive
   classical report
          1)complicated
          2)Logo is not possible
          3)sorting,total ,etc...we have to write code
4. top-of-page will trigger when ever it find a write statement after that all the
     events get triggered
    initialization
        write :/ 'Hi i am below the top-of-page'.
    top-of-page
        write :/ 'Hi i am the top'.
        output
        Hi i am the top
        Hi i am below the top-of-page
5.we can use exit command inside a loop .
    if condition goes wrong straight away it comes out from the loop.
9.session
12. If we want to customize the SAP standard transaction that time we go for  User  exits
   There are
            screen exits,field exits,menu exits,and function module exits
  Important transactions
            CMOD,SMOD
  Important tables
           MODACT,MODSAP
13. we have to get the access key to modify the standard code
14. Online Service System - if we are not able to solve or we can find any complication in sap related issue we can raise a oss note ,the problem will be rectified by the SAP team and we have to pay for that.
15.    SE30 - runtime analysis
         ST05 - SQL trace
Regards
P.Thangaraj