ABAP FAQ - 2

ABAP FAQ's

What is the difference between SAP memory and ABAP memory?
Answer1:
data sending between main sessions using get parameter and set parameter is sap memory
data sending between internal sessions using import or export parameters is abap memory

What is the difference between Table and Template?
table is a dynamic and template is a static

When do we use End-of-selection?
End-of-selection event are mostly used when we are writing HR-ABAP code. In the HR-ABAP code, data is retrived in the Start-of-selection event and Printing on the list and all will be done in End-of-selection event.

What is table buffer? Which type of tables used this buffer?
buffer is nothing but a memory area. table is buffered means that table information is available on application server. when you call data from database table it will come from application server.transperent and pooled tables are buffered. cluster tables can not buffered.

What is the difference between SAP memory and ABAP memory?
Answer1:
data sending between main sessions using get parameter and set parameter is sap memory
data sending between internal sessions using import or export parameters is abap memory

Answer2:
sap memory is a global memory whereas abap memory is local memory.

For example, we have four programs in abap memory and assigned some varibles to a particular program in abap memory then those varibles can't be used by anyother program in abap memory i.e., the variables are only for that program and also local to that memory,whereas sap memory can access all the abap memory or else it can perform any kind of modifications.

Answer3:
SAP memory is available to the user during the entire terminal session.
ABAP memory is available to the user during life time of external session.

What is the difference between Type and Like?
Answer1:
TYPE, you assign datatype directly to the data object while declaring.
LIKE,you assign the datatype of another object to the declaring data object. The datatype is referenced indirectly.

Answer2:
Type is a keyword used to refer to a data type whereas Like is a keyword used to copy the existing properties of already existing data object.

Answer3:
type refers the existing data type
like refers the existing data object

What is difference between dialog program and a report?
Report is a excecutable program
Dialog is a module pool program.It has to be executed via a transaction only.
Dialog programming is used for customization ofscreens

What is Field sysmbol ?
Answer1:
You can use field symbols to make the program more dynamic. In this exanmple the name of a table control is substituted by a field symbol. Thus you cal call the form with any internal table, using the name of the tablæe control as a parameter.
Example
form insert_row
using p_tc_name.
field-symbols type cxtab_control. "Table control
assign (p_tc_name) to .
* insert 100 lines in table control
-lines = 100.

Why BAPI need then BDC ?
BAPI"S provide the standard interface to other applications apart from SAP and within differnt vesions of SAP too. Also it is OOD bases so dosen"t depends on screen flow. BDC gets failed if we make changes for screen changes through IMG customization

What are the advantages and disadvantages of using views in ABAP porgramming ?
advantages:
view is used to retrieve the data very fastly from the database tables
*memory wastage is reduced
*faster than joins to retrieve the data from database tables
disadvantages:
view is not a container,it will not hold the data
*view memory is not permanent memory

How can you debugg a script form?
SE71 -> give the form name -> utilities -> activate debugger