ALV using Object oriented programming concepts

Hi All,
I am unable to call a transaction after a hotspot click on a field.... I have used CALL METHOD w_grid->get_current_cell to get the cell info.....but this is not happening.... Can anyone plz tell me how to call a transaction on doing a hotspot click on a field?

One reason why your code is not working is i think the method you are using is Protected. ie it can't be used outside the class.
Try the following code.
In the method definition define the method as follows.
methods : HOTSPOT_CLICK
                 FOR EVENT HOTSPOT_CLICK OF CL_GUI_ALV_GRID
                 IMPORTING E_ROW_ID
                                   E_COLUMN_ID
                                   ES_ROW_NO.
The E_ROW_ID   E_COLUMN_ID   ES_ROW_NO are the parameters returnned by the event HOT-SPOT click.
Let us suppose I_MARA is your internal table using which you have displayed your ALV HRID.
Now in the method Implementation part use the following code.
METHOD HOTSPOT_CLICK.
    CLEAR : WA_MARA.
    READ TABLE I_MARA INDEX E_ROW_ID INTO WA_MARA.
    IF SY-SUBRC EQ 0.
      IF E_COLUMN_ID-FIELDNAME EQ C_MATNR.
        SET PARAMETER ID 'MAT' FIELD WA_MARA-MATNR.
        SET PARAMETER ID 'WRK' FIELD C_WERKS.
        CALL TRANSACTION 'MD04' AND SKIP FIRST SCREEN.
      ELSE.
        CALL SCREEN 0130 starting at 35 15.
      ENDIF.
    ENDIF.
ENDMETHOD.
At the call Transaction point you can call which ever Transaction you want.
And aslo please check if you have registered the event HOTSPOT.
Hope this code works.
Thanks & regards,
Y Gautham

Similar Messages

Object Oriented Programming concepts

Hi Friends,
I need your help to understand the Object Oriented Programming concepts.
Please help me…
Thanks,
Fl4syed

Hi,
We can learn oops concepts very easily.Refering some books and search this concepts in some websites related to it.I think the author Robert lafore of oops is one of the best way to learn oops concepts.

ALV grid using Object oriented programming

Hi,
I need to display a report with 14 fields of which some fields need sub totals and some fields need average values and some other fields require both subtotals and totals. But if I need only the subtotals. I'm not able to find a way for doing so. Please help.
Thanks and regards
Radhika

You will have to specify DO_SUM = X for the fields which you want to totalled or sub-totalled and set DO_SUM = C for getting the average of the field. This needs to be done in the field catalog.
Also, specify the SORT criteria for the doing the sub-totals in the IT_SORT table, of the SET_TABLE method or the user can do that himself in the report.
Regards,
Ravi
Note - Please mark all the helpful answers

How to write Block ALV using Object-oriented methodology?

Hi all,
How to write a Block ALV without using 'Reuse_ALV.....' FMs? I want to use the CL_GUI....' methods. What is the procedure? Any sample block ALV?
Thanks,
Charles.

Currently there is not an OO method of implementing the block ALV, it is only available using the REUSE function module.
Regards,
RIch Heilman

Adding color to a row in alv grid not using object oriented.

Hello Gurus.
I want to display a row in color in alv grid using normal alv, not by using object oriented programming.
I am having one of the field say spart ie division in internal table itab.
The spart has values like 12 , 45, 67, 68 ,88 ,99.
when ever spart is 12 i want to display that row in color format. Here this table is sorted by mblnr so if 1st record is 12 then may be 50 th record will be 12. so when where the record contains the value has 12 then that row should be displayed in color. So please tell me how to do it. Previously i posted the same question but i got is by using object oriented. so please tell me how to do it without using object oriented.
Thanks for all the replies.

Check this example code.
report zrich_0004
       no standard page heading.
type-pools slis.
data: fieldcat type slis_t_fieldcat_alv.
data: begin of imara occurs 0,
      matnr type mara-matnr,
      mtart type mara-mtart,
      maktx type makt-maktx,
      color_line(4) type c,
      tcolor type slis_t_specialcol_alv, "cell
      end of imara.
data: xcolor type slis_specialcol_alv.
start-of-selection.
perform get_data.
perform write_report.
* Get_Data
form get_data.
imara-matnr = 'ABC'.
imara-mtart = 'ZCFG'.
imara-maktx = 'This is description for ABC'.
append imara.
imara-matnr = 'DEF'.
imara-mtart = 'ZCFG'.
imara-maktx = 'This is description for DEF'.
append imara.
imara-matnr = 'GHI'.
imara-mtart = 'ZCFG'.
imara-maktx = 'This is description for GHI'.
append imara.
loop at imara.
    if sy-tabix = 1.
      imara-color_line = 'C410'.   " color line
    endif.
    if sy-tabix = 2.          "color CELL
      clear xcolor.
      xcolor-fieldname = 'MTART'.
      xcolor-color-col = '3'.
      xcolor-color-int = '1'. "Intensified on/off
      xcolor-color-inv = '0'.
      append xcolor to imara-tcolor.
    endif.
    modify imara.
endloop.
endform.
* WRITE_REPORT
form write_report.
data: layout type slis_layout_alv.
layout-coltab_fieldname = 'TCOLOR'.
layout-info_fieldname = 'COLOR_LINE'.
perform build_field_catalog.
* CALL ABAP LIST VIEWER (ALV)
call function 'REUSE_ALV_GRID_DISPLAY'
       exporting
            is_layout   = layout
            it_fieldcat = fieldcat
       tables
            t_outtab    = imara.
endform.
* BUILD_FIELD_CATALOG
form build_field_catalog.
data: fc_tmp type slis_t_fieldcat_alv with header line.
clear: fieldcat. refresh: fieldcat.
clear: fc_tmp.
fc_tmp-reptext_ddic    = 'Material Number'.
fc_tmp-fieldname = 'MATNR'.
fc_tmp-tabname   = 'IMARA'.
fc_tmp-outputlen = '18'.
append fc_tmp to fieldcat.
clear: fc_tmp.
fc_tmp-reptext_ddic    = 'Material Type'.
fc_tmp-fieldname = 'MTART'.
fc_tmp-tabname   = 'IMARA'.
fc_tmp-outputlen = '4'.
append fc_tmp to fieldcat.
clear: fc_tmp.
fc_tmp-reptext_ddic    = 'Material'.
fc_tmp-fieldname = 'MAKTX'.
fc_tmp-tabname   = 'IMARA'.
fc_tmp-outputlen = '40'.
fc_tmp-emphasize = 'C610'.   " color column
append fc_tmp to fieldcat.
endform.
Regards,
Rich Heilman

How to avoid the case of leaks memory in Object Oriented Programming

Hi, Everyone, I am writing a simple web-baed application for JSP and Servlet, I pass all data from JSP to Servlet, It is due to the number of row of record are variable, so I should write a Java Instance class to stored to specific data in a Java Object, and then stored those object in a arraylist In the Servlet class, and then pass the arraylist in to a session, to pass the session from the servlet to another JSP......
But some thing I am worried about is that if the no of row of record user input is large, then the number of object stored in the arraylist will also large. I am worried it will serious leaks memoary in my server. Because my server always occurs "Out Of Memoary Exception" in Tomcat, So If I use the above method. I affarid the memory will be further leaking in my server. So What can I do? Is it having any better method to prevent memory leaking when using Object Oriented Programming(Except using Hibernate)?
Can Anyone be help me?
Thank you very much for All, THX

Because many people say that the large amount of
using Object will lead to "memory leak", I am worried
about the size of object I use is too large and then
it will construct "memory leak". No it will not! You get a 'memory leak' by holding references to objects you no longer require.
>
The detail of my case is that:
In my web application, there is a session variable
pass through from one servlet to another jsp/servlet.You should only place small amounts of data in the session. If you need forward from a Servlet to a JSP (or JSP to Servlet) then you should place the data object in the request (using the setAttribute() method), not in the session. In this way, when the session is re-claimed so will be the data object.
And this session variable is stored a Instance Object
(which is a class write by me) with the following
issue:
1) This instance object having "has-a relationship"
with another four instance object (all are the
classes write by me)
2) This instance object having "has relationship"
with a arraylist, this arraylist is stored about 4-5
instance object(all are the classes write by me) .
If this object having the above issue, Will this
object construct a "leaks memory" when this object
stored in the session and pass through servlet to
another jsp/servlet?
Message was edited by:
sabre150

Notes on using Object oriented concept in ABAP

Hi ,
I want somes notes on how to use Object oriented concept in ABAP.
Thanks in advance.
Chetan

Hi, this may help you
OOPs ABAP uses Classes and Interfaces which uses Methods and events.
If you have Java skills it is advantage for you.
There are Local classes as well as Global Classes.
Local classes we can work in SE38 straight away.
But mostly it is better to use the Global classes.
Global Classes or Interfaces are to be created in SE24.
SAP already given some predefined classes and Interfaces.
This OOPS concepts very useful for writing BADI's also.
So first create a class in SE 24.
Define attributes, Methods for that class.
Define parameters for that Method.
You can define event handlers also to handle the messages.
After creation in each method write the code.
Methods are similar to ABAP PERFORM -FORM statements.
After the creation of CLass and methods come to SE38 and create the program.
In the program create a object type ref to that class and with the help of that Object call the methods of that Class and display the data.
Example:
REPORT sapmz_hf_alv_grid .
Type pool for icons - used in the toolbar
TYPE-POOLS: icon.
TABLES: zsflight.
To allow the declaration of o_event_receiver before the
lcl_event_receiver class is defined, decale it as deferred in the
start of the program
CLASS lcl_event_receiver DEFINITION DEFERRED.
G L O B A L I N T E R N A L T A B L E S
*DATA: gi_sflight TYPE STANDARD TABLE OF sflight.
To include a traffic light and/or color a line the structure of the
table must include fields for the traffic light and/or the color
TYPES: BEGIN OF st_sflight.
INCLUDE STRUCTURE zsflight.
Field for traffic light
TYPES: traffic_light TYPE c.
Field for line color
types: line_color(4) type c.
TYPES: END OF st_sflight.
TYPES: tt_sflight TYPE STANDARD TABLE OF st_sflight.
DATA: gi_sflight TYPE tt_sflight.
G L O B A L D A T A
DATA: ok_code LIKE sy-ucomm,
Work area for internal table
g_wa_sflight TYPE st_sflight,
ALV control: Layout structure
gs_layout TYPE lvc_s_layo.
Declare reference variables to the ALV grid and the container
DATA:
go_grid TYPE REF TO cl_gui_alv_grid,
go_custom_container TYPE REF TO cl_gui_custom_container,
o_event_receiver TYPE REF TO lcl_event_receiver.
DATA:
Work area for screen 200
g_screen200 LIKE zsflight.
Data for storing information about selected rows in the grid
DATA:
Internal table
gi_index_rows TYPE lvc_t_row,
Information about 1 row
g_selected_row LIKE lvc_s_row.
C L A S S E S
CLASS lcl_event_receiver DEFINITION.
PUBLIC SECTION.
METHODS:
handle_toolbar FOR EVENT toolbar OF cl_gui_alv_grid
IMPORTING
e_object e_interactive,
handle_user_command FOR EVENT user_command OF cl_gui_alv_grid
IMPORTING e_ucomm.
ENDCLASS.
CLASS lcl_event_receiver IMPLEMENTATION
CLASS lcl_event_receiver IMPLEMENTATION.
METHOD handle_toolbar.
Event handler method for event toolbar.
CONSTANTS:
Constants for button type
c_button_normal TYPE i VALUE 0,
c_menu_and_default_button TYPE i VALUE 1,
c_menu TYPE i VALUE 2,
c_separator TYPE i VALUE 3,
c_radio_button TYPE i VALUE 4,
c_checkbox TYPE i VALUE 5,
c_menu_entry TYPE i VALUE 6.
DATA:
ls_toolbar TYPE stb_button.
Append seperator to the normal toolbar
CLEAR ls_toolbar.
MOVE c_separator TO ls_toolbar-butn_type..
APPEND ls_toolbar TO e_object->mt_toolbar.
Append a new button that to the toolbar. Use E_OBJECT of
event toolbar. E_OBJECT is of type CL_ALV_EVENT_TOOLBAR_SET.
This class has one attribute MT_TOOLBAR which is of table type
TTB_BUTTON. The structure is STB_BUTTON
CLEAR ls_toolbar.
MOVE 'CHANGE' TO ls_toolbar-function.
MOVE icon_change TO ls_toolbar-icon.
MOVE 'Change flight' TO ls_toolbar-quickinfo.
MOVE 'Change' TO ls_toolbar-text.
MOVE ' ' TO ls_toolbar-disabled.
APPEND ls_toolbar TO e_object->mt_toolbar.
ENDMETHOD.
METHOD handle_user_command.
Handle own functions defined in the toolbar
CASE e_ucomm.
WHEN 'CHANGE'.
PERFORM change_flight.
LEAVE TO SCREEN 0.
ENDCASE.
ENDMETHOD.
ENDCLASS.
S T A R T - O F - S E L E C T I O N.
START-OF-SELECTION.
SET SCREEN '100'.
*& Module USER_COMMAND_0100 INPUT
MODULE user_command_0100 INPUT.
CASE ok_code.
WHEN 'EXIT'.
LEAVE TO SCREEN 0.
ENDCASE.
ENDMODULE. " USER_COMMAND_0100 INPUT
*& Module STATUS_0100 OUTPUT
MODULE status_0100 OUTPUT.
DATA:
For parameter IS_VARIANT that is sued to set up options for storing
the grid layout as a variant in method set_table_for_first_display
l_layout TYPE disvariant,
Utillity field
l_lines TYPE i.
After returning from screen 200 the line that was selected before
going to screen 200, should be selected again. The table gi_index_rows
was the output table from the GET_SELECTED_ROWS method in form
CHANGE_FLIGHT
DESCRIBE TABLE gi_index_rows LINES l_lines.
IF l_lines > 0.
CALL METHOD go_grid->set_selected_rows
EXPORTING
it_index_rows = gi_index_rows.
CALL METHOD cl_gui_cfw=>flush.
REFRESH gi_index_rows.
ENDIF.
Read data and create objects
IF go_custom_container IS INITIAL.
Read data from datbase table
PERFORM get_data.
Create objects for container and ALV grid
CREATE OBJECT go_custom_container
EXPORTING container_name = 'ALV_CONTAINER'.
CREATE OBJECT go_grid
EXPORTING
i_parent = go_custom_container.
Create object for event_receiver class
and set handlers
CREATE OBJECT o_event_receiver.
SET HANDLER o_event_receiver->handle_user_command FOR go_grid.
SET HANDLER o_event_receiver->handle_toolbar FOR go_grid.
Layout (Variant) for ALV grid
l_layout-report = sy-repid. "Layout fo report
Setup the grid layout using a variable of structure lvc_s_layo
Set grid title
gs_layout-grid_title = 'Flights'.
Selection mode - Single row without buttons
(This is the default mode
gs_layout-sel_mode = 'B'.
Name of the exception field (Traffic light field) and the color
field + set the exception and color field of the table
gs_layout-excp_fname = 'TRAFFIC_LIGHT'.
gs_layout-info_fname = 'LINE_COLOR'.
LOOP AT gi_sflight INTO g_wa_sflight.
IF g_wa_sflight-paymentsum < 100000.
Value of traffic light field
g_wa_sflight-traffic_light = '1'.
Value of color field:
C = Color, 6=Color 1=Intesified on, 0: Inverse display off
g_wa_sflight-line_color = 'C610'.
ELSEIF g_wa_sflight-paymentsum => 100000 AND
g_wa_sflight-paymentsum < 1000000.
g_wa_sflight-traffic_light = '2'.
ELSE.
g_wa_sflight-traffic_light = '3'.
ENDIF.
MODIFY gi_sflight FROM g_wa_sflight.
ENDLOOP.
Grid setup for first display
CALL METHOD go_grid->set_table_for_first_display
EXPORTING i_structure_name = 'SFLIGHT'
is_variant = l_layout
i_save = 'A'
is_layout = gs_layout
CHANGING it_outtab = gi_sflight.
*-- End of grid setup -
Raise event toolbar to show the modified toolbar
CALL METHOD go_grid->set_toolbar_interactive.
Set focus to the grid. This is not necessary in this
example as there is only one control on the screen
CALL METHOD cl_gui_control=>set_focus EXPORTING control = go_grid.
ENDIF.
ENDMODULE. " STATUS_0100 OUTPUT
*& Module USER_COMMAND_0200 INPUT
MODULE user_command_0200 INPUT.
CASE ok_code.
WHEN 'EXIT200'.
LEAVE TO SCREEN 100.
WHEN'SAVE'.
PERFORM save_changes.
ENDCASE.
ENDMODULE. " USER_COMMAND_0200 INPUT
*& Form get_data
FORM get_data.
Read data from table SFLIGHT
SELECT *
FROM zsflight
INTO TABLE gi_sflight.
ENDFORM. " load_data_into_grid
*& Form change_flight
Reads the contents of the selected row in the grid, ans transfers
the data to screen 200, where it can be changed and saved.
FORM change_flight.
DATA:l_lines TYPE i.
REFRESH gi_index_rows.
CLEAR g_selected_row.
Read index of selected rows
CALL METHOD go_grid->get_selected_rows
IMPORTING
et_index_rows = gi_index_rows.
Check if any row are selected at all. If not
table gi_index_rows will be empty
DESCRIBE TABLE gi_index_rows LINES l_lines.
IF l_lines = 0.
CALL FUNCTION 'POPUP_TO_DISPLAY_TEXT'
EXPORTING
textline1 = 'You must choose a line'.
EXIT.
ENDIF.
Read indexes of selected rows. In this example only one
row can be selected as we are using gs_layout-sel_mode = 'B',
so it is only ncessary to read the first entry in
table gi_index_rows
LOOP AT gi_index_rows INTO g_selected_row.
IF sy-tabix = 1.
READ TABLE gi_sflight INDEX g_selected_row-index INTO g_wa_sflight.
ENDIF.
ENDLOOP.
Transfer data from the selected row to screenm 200 and show
screen 200
CLEAR g_screen200.
MOVE-CORRESPONDING g_wa_sflight TO g_screen200.
LEAVE TO SCREEN '200'.
ENDFORM. " change_flight
*& Form save_changes
Changes made in screen 200 are written to the datbase table
zsflight, and to the grid table gi_sflight, and the grid is
updated with method refresh_table_display to display the changes
FORM save_changes.
DATA: l_traffic_light TYPE c.
Update traffic light field
Update database table
MODIFY zsflight FROM g_screen200.
Update grid table , traffic light field and color field.
Note that it is necessary to use structure g_wa_sflight
for the update, as the screen structure does not have a
traffic light field
MOVE-CORRESPONDING g_screen200 TO g_wa_sflight.
IF g_wa_sflight-paymentsum < 100000.
g_wa_sflight-traffic_light = '1'.
C = Color, 6=Color 1=Intesified on, 0: Inverse display off
g_wa_sflight-line_color = 'C610'.
ELSEIF g_wa_sflight-paymentsum => 100000 AND
g_wa_sflight-paymentsum < 1000000.
g_wa_sflight-traffic_light = '2'.
clear g_wa_sflight-line_color.
ELSE.
g_wa_sflight-traffic_light = '3'.
clear g_wa_sflight-line_color.
ENDIF.
MODIFY gi_sflight INDEX g_selected_row-index FROM g_wa_sflight.
Refresh grid
CALL METHOD go_grid->refresh_table_display.
CALL METHOD cl_gui_cfw=>flush.
LEAVE TO SCREEN '100'.
ENDFORM. " save_changes
chk this blog
/people/vijaybabu.dudla/blog/2006/07/21/topofpage-in-alv-using-clguialvgrid
Reward if helpfull.
Regards Madhu.

Trying to understand the basic concept of object oriented programming.

I am trying to understand the basic concept of object oriented programming.
Object - a region of storage that define is defined by both state/behavior.
( An object is the actual thing that behavior affects.)
State - Represented by a set of variables and the values they contain.
(Is the location or movement or action that is the goal that the behavior is trying to accomplish.)
Variables- (What does this mean?)
Value - (What does this mean?)
Behavior - Represented by a set of methods and the logic they implement.
( A set of methods that is built up to tell's the how object to change it's state. )
Methods - A procedure that is executed when an object receives a message.
( A very basic comand.For example the method tells the object to move up, another method tells the method to go left. Thus making the object move up/left that combination is the behavior.)
Class - A template from which the objects are created.
( I am very confused on what classes are.)
- The definitions of the words I obtained from the "Osborne Teach Yourself Java". The () statements are how I interperate the Mechanisms (I do not know if Thats what you call them.) interact with each other. I understand my interpretation may be horribly wrong. I will incredibly appreciate all the support I may get from you.
Thank you

Object oriented programming is a replacement for the older idea of procedural programming (you can research procedural programming in google). As I understand it, in procedural programming, you have a step by step set of function calls to accomplish some task. Each function receives a data structure, manipulates it, and passes it to the next function. The problem with this is that each function preforms some action for the overall task and can't easily be reused by some other task. Its also harder to read the flow of what is happening with raw data structures flying all over the place.
In object oriented programming, an object calls a function of another object and receives back, not a data structure, but another object. Objects contain a data structure that can only be accessed by its functions. An object is not so much a sub component of a bigger task, as it is a service that any other task can use for any purpose. Also, when you pass an object to the caller, the caller can ask questions about the data structure via its functions. The developer doesnt have to know what the previous function did to the data by reading up on any documentation, or having to reverse engineer the code.
I suggest the best way of learning this is to code something like a library object.
A library object contains a collection of book objects
A book object contains a collection of chapter objects
A chapter object contains a collection of paragraph objects
A paragraph object contains a collection of sentence objects
A sentence object contains a collection of word objects.
Add functions to each object to provide a service
Example: A library object should have a:
public void addBook(Book book)
public Book getBook(String title)
public boolean isBookInLibrary(String title)
The key is to add functions to provide a service to anyone who uses your object(s)
For example, what functions (service) should a paragraph object provide?
It shouldn't provide a function that tells how many words there are in a sentence. That function belongs to a sentence object.
Lets say you want to add a new chapter to a book. The task is easy to read
if you write your objects well:
Sentence sentence1=new Sentence("It was a dark and stormy night");
Sentence sentence2=new Sentence("Suddenly, a shot ran out");
Paragraph paragraph=new Paragraph();
paragraph.addSentence(sentence1);
paragraph.addSentence(sentence2);
Paragraphs paragraphs=new Paragraphs();
paragraphs.addParagraph(paragraph);
Library library= new Library();
library.getBook("My Novel").addChapter("Chapter 1",paragraphs).
Now, lets say you want to have a word count for the entire book.
The book should ask each chapter how many words it contains.
Each chapter should ask its paragraphs, each paragraph should ask
its sentences. The total of words should ripple up and be tallied at each
stage until it reaches the book. The book can then report the total.
Only the sentence object actually counts words. The other objects just tallies the counts.
Now, where would you assign a librarian? What object(s) and functions would you provide?
If written well, the project is easily extensible.

How to display horizontal line in top-of-page by using object oriented ALV?

How to display horizontal line in top-of-page by using object oriented ALV.
I am created top-of-page in object oriented alv.
But not be successes in showing horizontal line in it.
Can any one pls give solution for this..
Thanks and regards..

Hi
Try like this
data: gt_list_top_of_page type slis_t_listheader. " Top of page text.
Initialization.
perform comment_build using gt_list_top_of_page[].
form top_of_page.
* Note to self: the gif must be loaded into transaction OAOR with
* classname 'PICTURES' AND TYPE 'OT' to work with ALV GRID Functions.
* I Loaded NOVALOGO2 into system.
call function 'REUSE_ALV_COMMENTARY_WRITE'
     exporting
* I_LOGO = 'NOVALOGO2'
* i_logo = 'ENJOYSAP_LOGO'
         it_list_commentary = gt_list_top_of_page.
endform. " TOP_OF_PAGE
form comment_build using e04_lt_top_of_page type slis_t_listheader.
data: ls_line type slis_listheader.
      clear ls_line.
      ls_line-typ = 'A'.
      ls_line-info = 'Special'(001).
      fgrant = xgrant.
      concatenate ls_line-info fgrant
      'Stock Option Report to the board'(002)
             into ls_line-info separated by space.
                    condense ls_line-info.
      append ls_line to e04_lt_top_of_page.
endform. " COMMENT_BUILD
Use following syntex for footer print in alv:
* For End of Page
form END_OF_PAGE.
data: listwidth type i,
        ld_pagepos(10) type c,
        ld_page(10)    type c.
write: sy-uline(50).
skip.
write:/40 'Page:', sy-pagno .
endform.
* For End of Report
form END_OF_LIST.
data: listwidth type i,
        ld_pagepos(10) type c,
        ld_page(10)    type c.
skip.
write:/40 'Page:', sy-pagno .
endform.
check this link
http://abapprogramming.blogspot.com/
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/5dc3e690-0201-0010-1ebf-b85b3bed962d
Changing width of a custom container dynamically
Display Page numbers in ALV
Insert picture in selection screen.
Logo in OO ALV Grid
Reward all helpfull answers
Regards
Pavan

Concept of object oriented programming

does anyone have notes on concepts of object oriented programming language (Encapsulation,polymorphism,messages,class,inheritance and all that) i tried to find them but i only got definitions for them but i want advantages and disadvantages of concepts also plz can anyone help me

You want the advantages/disadvantages.. hard to find... i got some notes on OO concepts.. u want? Please send me a email to [email protected].. will post it on geocities with the link once u send me the email

How to capture index/row no of row in table using object oriented alv.

i have a table with many fields. i have an alv grid table displayed using object oriented alv. when i double click on a record, i call another screen. there i want to display the record number. eg, if i doubleclick on the third row, i will go to next screen and display 3 there.
please let me know how it is done as it is urgent.
thanks in advance.

Hi,
Use the following code to get rowno.
CLASS lcl_grid_events DEFINITION DEFERRED.
DATA:
grid1_events      TYPE REF TO lcl_grid_events.
CLASS lcl_grid_events DEFINITION.
PUBLIC SECTION.
    METHODS:
      dbclk
       FOR EVENT double_click OF cl_gui_alv_grid
       IMPORTING e_row
                 e_column
                 es_row_no.
ENDCLASS.                    "lcl_grid_events DEFINITION
CLASS lcl_grid_events IMPLEMENTATION.
METHOD dbclk.
*access e_row variable, which contains the record no.
ENDMETHOD.                    "dbclk
ENDCLASS.                    "lcl_grid
write the following code after method call of set_table_for_first_display
    CREATE OBJECT grid1_events.
    SET HANDLER grid1_events->dbclk
                FOR grid1.
reward point if useful.

Do editable a column of a ALV (object oriented programming)

Hello,
How I can do editable a column of a ALV (object oriented programming) ??
What field of a fieldcatalog let it ??
Thanks.
wa_fieldcatalog-fieldname = 'NUM_KGS'.
wa_fieldcatalog-seltext = 'Kg'.
wa_fieldcatalog-coltext = 'Kg'.
wa_fieldcatalog-just = 'L'.
wa_fieldcatalog-tabname = 'IT_DATOS'.
wa_fieldcatalog- ?????????

In the program add the following field
wa_fieldcatalog-EDIT = 'X'.
append wa_fieldcatalog.
you will get the column editable

Object oriented programming aspects in Oracle

Dear All,
Can you one explain me the aspects of Object Oriented Programming in Oracle. How to use oops concepts in Oracle Procedures, functions, packages, etc.
Thanks,
Moorthy.GS

Oracle 9i introduces support for inheritance, method overriding and dynamic method dispatch (or "dynamic binding", or "virtual").
A method call is dispatched to the nearest implementation, working back up the inheritance hierarchy from the current or specified type.
See, for example, how we can implement the Template Design Pattern in PL/SQL, using inheritance, method overriding and dynamic method dispatch:
http://www.quest-pipelines.com/pipelines/plsql/tips06.htm#OCTOBER
Oracle 11g introduces support for "super" object-oriented keyword. One attempt to do this in PLSQL 9i/10g:
Calling the Parent Object's Version of an Overridden Method
http://www.quest-pipelines.com/pipelines/plsql/tips03.htm#JUNE
I expect some OO improvements in the future (in Oracle 12oo ...):
1. References between transient objects (instances of objects types) and (then) garbage collector
2. Generic classes (templates, generics) like in Eiffel, C++, Java 5 (PL/SQL was modeled after ADA 83, and ADA 83 has generic packages)
3. Multiple inheritance like in Eiffel (inner classes like in Java - no, please)
4. Design By Contract like in Eiffel (C++ / Java 1.4 assert is not enough)
Design by contract (DBC) is a method whose author is Bertrand Mayer, also maker of OOPL language Eiffel
(Eiffel was designed in 1985, commercialy released in 1986, ISO-standardized in 2006).
Simplified, DBC is based on principle that in each routine (procedure or function) with standard code,
two additional parts – PRECONDITION and POSTCONDITION - need to be asserted.
An additional assertion in class is called INVARIANT.
Contract is based on routine's putting up an obligation to caller (to some other routine)
to satisfy conditions of precondition and conditions of invariant, and hers (called routine's) obligation
to satisfy conditions of postcondition and conditions of invariant.
The object oriented Eiffel programming language was created to implement DBC.
For now, other OO (object-oriented) languages don’t support directly the ideas behind DBC.
However, precondition and postcondition are applicable to many programming languages, both OO and not OO.
Invariants are applicable only in OOPL.
This is my attempt to use DBC methodology (including invariants) in Oracle PL/SQL.
Eiffel class interface (not like Java interface, but more like PL/SQL package specification)
from Bertrand Meyer's book "Object oriented software construction", second edition (OOSC2), 1997, page 390-391:
class interface STACK [G]
creation make
feature -- Initialization
make (n: INTEGER) is -- Alocate stack for a maximum of n elements
    require
      non_negative_capacity: n >= 0
    ensure
      capacity_set: capacity = n
    end
feature -- Access
capacity: INTEGER -- Maximum number of stack elements
count: INTEGER -- Number of stack elements
item: G is -– Top element
    require
      not_empty: not empty
    end
feature -- Status report
empty: BOOLEAN is –- Is stack empty?
    ensure
      empty_definition: Result = (count = 0)
    end
full: BOOLEAN is –- Is stack full?
    ensure
      full_definition: Result = (count = capacity)
    end
feature -- Element change
put (x: G) is –- Add x on top
    require
      not_full: not full
    ensure
      not_empty: not empty
      added_to_top: item = x
      one_more_item: count = old count + 1
    end
remove is -– Remove top element
    require
      not_empty: not empty
    ensure
      not_full: not full
      one_fewer: count = old count - 1
    end
invariant
count_non_negative: 0 <= count
count_bounded: count <= capacity
empty_if_no_elements: empty = (count = 0)
end -– class interface STACK
-- PL/SQL "equivalent":
-- Stack implementation - TABLE of INTEGER.
-- Eiffel has generic classes (like C++ templates and better than Java generics).
-- PL/SQL (now) has not generic classes or generic packages.
CREATE OR REPLACE TYPE array_t AS TABLE OF INTEGER
-- utility package:
CREATE OR REPLACE PACKAGE dbc AS
-- 0 = no check
-- 1 = check preconditions
-- 2 = check preconditions + postconditions
-- 3 = check preconditions + postconditions + invariants
c_no_check                  CONSTANT INTEGER := 0;
c_check_preconditions       CONSTANT INTEGER := 1;
c_check_pre_postconditions CONSTANT INTEGER := 2;
c_check_pre_post_invariants CONSTANT INTEGER := 3;
FUNCTION check_preconditions       RETURN BOOLEAN;
FUNCTION check_pre_postconditions RETURN BOOLEAN;
FUNCTION check_pre_post_invariants RETURN BOOLEAN;
PROCEDURE set_level (p_level INTEGER);
PROCEDURE display_error (p_error VARCHAR2);
END;
CREATE OR REPLACE PACKAGE BODY dbc AS
m_level INTEGER := c_no_check;
FUNCTION check_preconditions RETURN BOOLEAN IS
BEGIN
    IF m_level >= c_check_preconditions THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
FUNCTION check_pre_postconditions RETURN BOOLEAN IS
BEGIN
    IF m_level >= c_check_pre_postconditions THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
FUNCTION check_pre_post_invariants RETURN BOOLEAN IS
BEGIN
    IF m_level >= c_check_pre_post_invariants THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
PROCEDURE set_level (p_level INTEGER) IS
BEGIN
    IF p_level NOT IN
      (c_no_check, c_check_preconditions, c_check_pre_postconditions, c_check_pre_post_invariants)
    THEN
      RAISE_APPLICATION_ERROR (-20000, 'Wrong checking level');
    END IF;
    m_level := p_level;
END;
PROCEDURE display_error (p_error VARCHAR2) IS
BEGIN
    RAISE_APPLICATION_ERROR (-20000, 'ERROR in method ' || p_error);
END;
END;
CREATE OR REPLACE TYPE stack AS OBJECT (
-- Maximum number of stack elements
capacity INTEGER,
-- Number of stack elements
el_count INTEGER,
-- Stack implementation
stack_implementation array_t,
-- Alocate stack for a maximum of n elements
CONSTRUCTOR FUNCTION stack (n INTEGER) RETURN SELF AS RESULT,
-- Top element
MEMBER FUNCTION item (SELF IN OUT stack) RETURN INTEGER,
-- Is stack empty?
MEMBER FUNCTION empty RETURN BOOLEAN,
-- Is stack full?
MEMBER FUNCTION full RETURN BOOLEAN,
-- Add x on top
MEMBER PROCEDURE put (x INTEGER),
-- Remove top element
MEMBER PROCEDURE remove,
-- INVARIANTS
-- Note:
-- If subprogram is declared in an object type body (in PL/SQL 8i/9i/10g)
-- it must be defined in the object type specification too.
MEMBER FUNCTION count_non_negative RETURN BOOLEAN,
MEMBER FUNCTION count_bounded RETURN BOOLEAN,
MEMBER FUNCTION empty_if_no_elements RETURN BOOLEAN,
MEMBER PROCEDURE check_invariants
) NOT FINAL;
CREATE OR REPLACE TYPE BODY stack AS
CONSTRUCTOR FUNCTION stack (n INTEGER) RETURN SELF AS RESULT IS
BEGIN
    IF dbc.check_preconditions AND n < 0 THEN
      dbc.display_error ('stack - PRE');
    END IF;
    check_invariants;
    capacity := n;
    stack_implementation := array_t();
    stack_implementation.EXTEND (n);
    IF dbc.check_pre_postconditions AND capacity <> n THEN
      dbc.display_error ('stack - POST');
    END IF;
    check_invariants;
END;
MEMBER FUNCTION item (SELF IN OUT stack) RETURN INTEGER IS
BEGIN
    IF dbc.check_preconditions AND empty THEN
      dbc.display_error ('item - PRE');
    END IF;
    check_invariants;
    RETURN stack_implementation(el_count);
END;
MEMBER FUNCTION empty RETURN BOOLEAN IS
BEGIN
    IF el_count = 0 THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER FUNCTION full RETURN BOOLEAN IS
BEGIN
    IF el_count = capacity THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER PROCEDURE put (x INTEGER) IS
BEGIN
    IF dbc.check_preconditions AND full THEN
      dbc.display_error ('put - PRE');
    END IF;
    check_invariants;
    el_count := el_count + 1;
    stack_implementation(el_count) := x;
    -- PL/SQL has not Eiffel's OLD
    -- one_more_item: count = old count + 1
    IF dbc.check_pre_postconditions AND (empty OR item <> x) THEN
      dbc.display_error ('put - POST');
    END IF;
    check_invariants;
END;
MEMBER PROCEDURE remove IS BEGIN
    IF dbc.check_preconditions AND empty THEN
      dbc.display_error ('remove - PRE');
    END IF;
    check_invariants;
    el_count := el_count - 1;
    -- PL/SQL has not Eiffel's OLD
    -- one_fewer: count = old count - 1
    IF dbc.check_pre_postconditions AND full THEN
      dbc.display_error ('remove - POST');
    END IF;
    check_invariants;
END;
-- INVARIANTS
MEMBER FUNCTION count_non_negative RETURN BOOLEAN IS
BEGIN
    IF el_count >= 0 THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER FUNCTION count_bounded RETURN BOOLEAN IS
BEGIN
    IF el_count <= capacity THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER FUNCTION empty_if_no_elements RETURN BOOLEAN IS
BEGIN
    IF empty AND (el_count = 0)
       OR
       NOT empty AND (el_count <> 0)
    THEN
      RETURN TRUE;
    ELSE
      RETURN FALSE;
    END IF;
END;
MEMBER PROCEDURE check_invariants IS
BEGIN
    IF NOT dbc.check_pre_post_invariants THEN
      RETURN; -- without checking invariants
    END IF;
    IF NOT count_non_negative THEN
      dbc.display_error ('INVARIANT count_non_negative');
    END IF;
    IF NOT count_bounded THEN
      dbc.display_error ('INVARIANT count_bounded');
    END IF;
    IF NOT empty_if_no_elements THEN
      dbc.display_error ('INVARIANT empty_if_no_elements');
    END IF;
END;
END; -- class body STACK
/Regards,
Zlatko Sirotic

Join Query in Object Oriented Programming

Hi,
I am trying to understand better how OO programming should work in CFC context. For example, I have two database tables: Customer and Order. So I create two CFCs, one for Customer and another for Order. In the CFCs I have query functions (select, insert, update) to access and manipulate data in the underlying tables.
Now, I need to create a new CFC, OrderReport. This CFC takes in customerID and returns data pulled from both Customer and Order tables. I can just have a join query that pulls data from these two tables. However, I have been wondering whether this method is within the spirit of Object Oriented programming. Should this CFC be able to access directly to the two tables? Or should I pull data separately using Customer CFC and Order CFC, and join them locally (ie. in OrderReport CFC)? This latter method would be a lot slower to run than the first method.
Can you advise me as to what the best practice is in the context of OO programming? Thank you.

This is a common question for those new to OO programming. Here are some of
my thoughts on the topic.
OO programming has nothing to do with tables. Your tables are essentially a
relational storage of one part of a business concept. It just so happens
that most of the data you need to support the business concept of Customer
and the business concept of Order are stored in tables named Customer and
Order. This is because database tables often relate to a business concept. I
think you'd find that to get the entire customer, you'd have to get data
from other tables, like State and Gender and other such tables.
The reason why I bring this up is to begin to separate your thinking.
Databases are concerned with efficient storage and retrieval of data.
Objects (CFCs) are not concerned at all with storage of data. Objects are
concerned with encapsulating business logic relating to a business concept.
Just like your database may have columns not needed by your CFCs, your CFCs
likely have methods not needed by your database.
For example, if you wanted to know, in your application, whether to show an
In Store Pickup option, you may wish to add an isLocal() method to your
customer object. This would ( we'll pretend) get the customer's zip code,
and look it up in GeographicalPostalServiceMapper object to tell us how far
away the customer is.
The point is, the right OO (CFC) design has nothing to do with how your
tables are organized in the database. You would do well to concern yourself
with the needs of the application and what sort of questions you need your
customer object to be able to answer to the other parts of your application.
Like, isLocal(), isOver21(), isBadCreditRisk() and so on.
As to your question about joins, you would do well to use joins in your
application. Do not be afraid of using queries to get the information you
need. Especially for reporting queries. In these cases, I often make an
object called a xxxList. My CustomerList.cfc would have the different ways
to list customer data, like CustomerOrders and CustomerOrderReturns. I'd
hide this join relationship inside of the CustomerList object so only the
CustomerList object has the SQL. That's usually enough encapsulation for the
needs of my application.
Truly, it doesn't matter what the name of the object is, just that you
assign it the responsibility of managing a business concept and keep that
business concept inside that object. You seem to have suggested
CustomerReport.cfc and that would be a fine name for an object that can
return numerous Customer Reports.
Happy Coding
DW

Object-oriented programming: state and behaivor

First of all, sorry for my level english.
In Object-Oriented programming, should an object save always some state?
What about session stateless bean service? What is the sense?
These objects have only behaivour and not state.
Perhaps, the sense is that you can send a message to this object, in oposite of a static methods in utility class?
Thanks and regards.

I suppose you could argue that if it doesn't have any state, then it's not really an "object" in the OOP sense, but who cares, really.
Personally, I use state and behavior as a way to help clarify the responsibilities of various classes in the system, and if I see a codebase with a lot of objects with state but no behavior or behavior but no state, then it's a a red flag that it's a messy, poorly-thought-out design (and it usually turns out to be exactly that). The whole point of OOP (IMHO) is encapsulation, and bundling state and behavior together makes things encapsulated (you can prove that state changes only in certain areas in certain circumstances). Encapsulation makes for more easily maintainable code.
It's easy to spot the blue squares in a Mondrian. It's difficult to spot the blue bits in a Pollock. The former is well-encapsulated OOP and the latter is poorly-encapsulated spaghetti code.
That said, it's not the end of the world if you have a static utility class here and there.

ALV using Object oriented programming concepts

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