ABAP Select data from SAP table KGALK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KGALK table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to KGALK. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the KGALK table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_KGALK TYPE STANDARD TABLE OF KGALK,
      WA_KGALK TYPE KGALK,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <KGALK> TYPE KGALK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KGALK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KGALK
  INTO TABLE IT_KGALK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KGALK
*  INTO TABLE @DATA(IT_KGALK2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_KGALK INDEX 1 INTO DATA(WA_KGALK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KGALK ASSIGNING <KGALK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KGALK>-POS = 1.
<KGALK>-SETKIND = 1.
<KGALK>-FIELD = 1.
<KGALK>-CLASS = 1.
<KGALK>-SETNAME = 1.

ENDLOOP.

LOOP AT IT_KGALK INTO WA_KGALK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KGALK-VALMIN, sy-vline,
  WA_KGALK-VALMAX, sy-vline,
  WA_KGALK-ACT, sy-vline,
  WA_KGALK-SETF, sy-vline,
  WA_KGALK-SING, sy-vline,
  WA_KGALK-INTER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KGALK you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_KGALK TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_KGALK INTO WA_KGALK.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_KGALK_STR, 
POS TYPE STRING,
SETKIND TYPE STRING,
FIELD TYPE STRING,
CLASS TYPE STRING,
SETNAME TYPE STRING,
VALMIN TYPE STRING,
VALMAX TYPE STRING,
ACT TYPE STRING,
SETF TYPE STRING,
SING TYPE STRING,
INTER TYPE STRING,
INTLEN TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
CONVEXIT TYPE STRING,
ROLLNAME TYPE STRING,
MODIFIED TYPE STRING,
DELETED TYPE STRING,
NOTUSED TYPE STRING,
TXT TYPE STRING,
NEXCC TYPE STRING,
PRECC TYPE STRING,
REPTEXT TYPE STRING,
MCONAME TYPE STRING,
FROM_MDATA TYPE STRING,
SCRTEXT_M2 TYPE STRING,
VALMIN2 TYPE STRING,
TXT2 TYPE STRING,
MFLAG TYPE STRING,
CHECKED TYPE STRING,
NOTWANTED TYPE STRING,
SENDERINH TYPE STRING,
SETID TYPE STRING,
DEP_GROUP TYPE STRING,
DEP_HIER TYPE STRING,
DEP_ACT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KGALK_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_KGALK_STR-POS sy-vline 
WA_KGALK_STR-SETKIND sy-vline 
WA_KGALK_STR-FIELD sy-vline 
WA_KGALK_STR-CLASS sy-vline 
WA_KGALK_STR-SETNAME sy-vline 
WA_KGALK_STR-VALMIN sy-vline 
WA_KGALK_STR-VALMAX sy-vline 
WA_KGALK_STR-ACT sy-vline 
WA_KGALK_STR-SETF sy-vline 
WA_KGALK_STR-SING sy-vline 
WA_KGALK_STR-INTER sy-vline 
WA_KGALK_STR-INTLEN sy-vline 
WA_KGALK_STR-SCRTEXT_M sy-vline 
WA_KGALK_STR-SCRTEXT_L sy-vline 
WA_KGALK_STR-CONVEXIT sy-vline 
WA_KGALK_STR-ROLLNAME sy-vline 
WA_KGALK_STR-MODIFIED sy-vline 
WA_KGALK_STR-DELETED sy-vline 
WA_KGALK_STR-NOTUSED sy-vline 
WA_KGALK_STR-TXT sy-vline 
WA_KGALK_STR-NEXCC sy-vline 
WA_KGALK_STR-PRECC sy-vline 
WA_KGALK_STR-REPTEXT sy-vline 
WA_KGALK_STR-MCONAME sy-vline 
WA_KGALK_STR-FROM_MDATA sy-vline 
WA_KGALK_STR-SCRTEXT_M2 sy-vline 
WA_KGALK_STR-VALMIN2 sy-vline 
WA_KGALK_STR-TXT2 sy-vline 
WA_KGALK_STR-MFLAG sy-vline 
WA_KGALK_STR-CHECKED sy-vline 
WA_KGALK_STR-NOTWANTED sy-vline 
WA_KGALK_STR-SENDERINH sy-vline 
WA_KGALK_STR-SETID sy-vline 
WA_KGALK_STR-DEP_GROUP sy-vline 
WA_KGALK_STR-DEP_HIER sy-vline 
WA_KGALK_STR-DEP_ACT sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.