There is an ABAP program tips document(157 pages) to download. I think it is very useful for ABAP developer.
Download abap program tips-v3

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*
* Copy Materials from one Plant to Another
* First run GETDATA AS CHECKBOX, "Tick to download materials data to local harddisk
* Second run UPDDATA AS CHECKBOX. "Tick to update date to Materials Master
* Check data in Excel before Second run
*
REPORT ZBAPIMM01 LINE-SIZE 255 NO STANDARD PAGE HEADING
[...]

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Below is ABAP upload and download HR photo program.(via web)

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REPORT z_barry_hr_photo_upload.
 
DATA: sapobjid LIKE sapb-sapobjid,
sappfad LIKE sapb-sappfad.
DATA: gd_path TYPE string ,
filetab TYPE TABLE OF file_info WITH HEADER LINE,
count TYPE i.
DATA: filename(40) TYPE c ,
[...]

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ABAP ALV Report- SD FLOW ALV

*&———————————————————————*
*& Report ZJACKTEST
*&
*&———————————————————————*
*&
*&
*&———————————————————————*
 
REPORT ZJACKTEST.
 
TYPE-POOLS: slis.
TABLES: vbak,vbap, knvv, kna1, mara ,lips, vbrp.
TYPES: BEGIN OF record,
sdoc LIKE vbak-vbeln,
sitem LIKE vbap-posnr,
mcode LIKE mara-matnr,
[...]

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How to block input area? You can check below method.

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PARAMETERS: p_werks LIKE mseg-werks OBLIGATORY DEFAULT ‘PHAS’ MODIF ID bl2.
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
IF screen-name = ‘P_WERKS’ .
screen-input = ‘0′.
screen-output = ‘1′.
MODIFY SCREEN.
ENDIF.
ENDLOOP.

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My client asks me to add a function that when he double click order column, he wants to see CO03.
Below is the ABAP code.

*&———————————————————————*
*& Form LINE_SELECTION
*&———————————————————————*
* text
*———————————————————————-*
* –> p1 text
* <– p2 [...]

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If you want to create Excel download button at selection screen, you can check below method.

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TABLES: sscrfields.
 
INITIALIZATION.
 
PERFORM init_data.
 
PERFORM file_download.
 
*&———————————————————————*
*& Form INIT_DATA
*&———————————————————————*
* text
*———————————————————————-*
* –> p1 text
* <– p2 [...]

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