ABAP Select data from SAP table KGALC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KGALC 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 KGALC. 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 KGALC 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_KGALC TYPE STANDARD TABLE OF KGALC,
      WA_KGALC TYPE KGALC,
      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: <KGALC> TYPE KGALC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KGALC
*  INTO TABLE @DATA(IT_KGALC2).
*--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_KGALC INDEX 1 INTO DATA(WA_KGALC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KGALC>-TAB = 1.
<KGALC>-CYCLE = 1.
<KGALC>-SDATE = 1.
<KGALC>-EDATE = 1.
<KGALC>-RSTATUS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KGALC-FREQ, sy-vline,
  WA_KGALC-CRDATE, sy-vline,
  WA_KGALC-PUSER, sy-vline,
  WA_KGALC-MODDATE, sy-vline,
  WA_KGALC-MODUSER, sy-vline,
  WA_KGALC-LASTEXEC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KGALC 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_KGALC 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_KGALC INTO WA_KGALC.


*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_KGALC_STR, 
TAB TYPE STRING,
CYCLE TYPE STRING,
SDATE TYPE STRING,
EDATE TYPE STRING,
RSTATUS TYPE STRING,
FREQ TYPE STRING,
CRDATE TYPE STRING,
PUSER TYPE STRING,
MODDATE TYPE STRING,
MODUSER TYPE STRING,
LASTEXEC TYPE STRING,
LEXECBY TYPE STRING,
TIMEEXEC TYPE STRING,
ITERFLAG TYPE STRING,
ASTATUS TYPE STRING,
CYCLESET TYPE STRING,
NEGTEST TYPE STRING,
TXT TYPE STRING,
MODIFIED TYPE STRING,
NEW TYPE STRING,
MAX_SEQNR TYPE STRING,
MAX_SEQPOS TYPE STRING,
ALART TYPE STRING,
IPKNZ TYPE STRING,
JOB TYPE STRING,
KUMUFLAG TYPE STRING,
XXKUMUFLAG TYPE STRING,
RCKUMUFLAG TYPE STRING,
NO_SRC_CE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KGALC_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_KGALC_STR-TAB sy-vline 
WA_KGALC_STR-CYCLE sy-vline 
WA_KGALC_STR-SDATE sy-vline 
WA_KGALC_STR-EDATE sy-vline 
WA_KGALC_STR-RSTATUS sy-vline 
WA_KGALC_STR-FREQ sy-vline 
WA_KGALC_STR-CRDATE sy-vline 
WA_KGALC_STR-PUSER sy-vline 
WA_KGALC_STR-MODDATE sy-vline 
WA_KGALC_STR-MODUSER sy-vline 
WA_KGALC_STR-LASTEXEC sy-vline 
WA_KGALC_STR-LEXECBY sy-vline 
WA_KGALC_STR-TIMEEXEC sy-vline 
WA_KGALC_STR-ITERFLAG sy-vline 
WA_KGALC_STR-ASTATUS sy-vline 
WA_KGALC_STR-CYCLESET sy-vline 
WA_KGALC_STR-NEGTEST sy-vline 
WA_KGALC_STR-TXT sy-vline 
WA_KGALC_STR-MODIFIED sy-vline 
WA_KGALC_STR-NEW sy-vline 
WA_KGALC_STR-MAX_SEQNR sy-vline 
WA_KGALC_STR-MAX_SEQPOS sy-vline 
WA_KGALC_STR-ALART sy-vline 
WA_KGALC_STR-IPKNZ sy-vline 
WA_KGALC_STR-JOB sy-vline 
WA_KGALC_STR-KUMUFLAG sy-vline 
WA_KGALC_STR-XXKUMUFLAG sy-vline 
WA_KGALC_STR-RCKUMUFLAG sy-vline 
WA_KGALC_STR-NO_SRC_CE sy-vline      INTO ld_text SEPARATED BY SPACE.

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