ABAP Select data from SAP table T77WWW_GAHLC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T77WWW_GAHLC 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 T77WWW_GAHLC. 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 T77WWW_GAHLC 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_T77WWW_GAHLC TYPE STANDARD TABLE OF T77WWW_GAHLC,
      WA_T77WWW_GAHLC TYPE T77WWW_GAHLC,
      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: <T77WWW_GAHLC> TYPE T77WWW_GAHLC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T77WWW_GAHLC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T77WWW_GAHLC
  INTO TABLE IT_T77WWW_GAHLC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T77WWW_GAHLC
*  INTO TABLE @DATA(IT_T77WWW_GAHLC2).
*--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_T77WWW_GAHLC INDEX 1 INTO DATA(WA_T77WWW_GAHLC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T77WWW_GAHLC ASSIGNING <T77WWW_GAHLC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T77WWW_GAHLC>-APPNO = 1.
<T77WWW_GAHLC>-GATYP = 1.
<T77WWW_GAHLC>-TSR01 = 1.
<T77WWW_GAHLC>-TSR02 = 1.
<T77WWW_GAHLC>-CSFLD = 1.

ENDLOOP.

LOOP AT IT_T77WWW_GAHLC INTO WA_T77WWW_GAHLC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T77WWW_GAHLC-ENDDA, sy-vline,
  WA_T77WWW_GAHLC-BEGDA, sy-vline,
  WA_T77WWW_GAHLC-MNDTR, sy-vline,
  WA_T77WWW_GAHLC-FLDVT, sy-vline,
  WA_T77WWW_GAHLC-WIDTH, sy-vline,
  WA_T77WWW_GAHLC-IVEMP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T77WWW_GAHLC 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_T77WWW_GAHLC 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_T77WWW_GAHLC INTO WA_T77WWW_GAHLC.


*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_T77WWW_GAHLC_STR, 
APPNO TYPE STRING,
GATYP TYPE STRING,
TSR01 TYPE STRING,
TSR02 TYPE STRING,
CSFLD TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
MNDTR TYPE STRING,
FLDVT TYPE STRING,
WIDTH TYPE STRING,
IVEMP TYPE STRING,
IEEMP TYPE STRING,
ROEMP TYPE STRING,
IVAPP TYPE STRING,
IEAPP TYPE STRING,
ROAPP TYPE STRING,
FLDOR TYPE STRING,
FEACT TYPE STRING,
DFVAL TYPE STRING,
FMTFV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T77WWW_GAHLC_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_T77WWW_GAHLC_STR-APPNO sy-vline 
WA_T77WWW_GAHLC_STR-GATYP sy-vline 
WA_T77WWW_GAHLC_STR-TSR01 sy-vline 
WA_T77WWW_GAHLC_STR-TSR02 sy-vline 
WA_T77WWW_GAHLC_STR-CSFLD sy-vline 
WA_T77WWW_GAHLC_STR-ENDDA sy-vline 
WA_T77WWW_GAHLC_STR-BEGDA sy-vline 
WA_T77WWW_GAHLC_STR-MNDTR sy-vline 
WA_T77WWW_GAHLC_STR-FLDVT sy-vline 
WA_T77WWW_GAHLC_STR-WIDTH sy-vline 
WA_T77WWW_GAHLC_STR-IVEMP sy-vline 
WA_T77WWW_GAHLC_STR-IEEMP sy-vline 
WA_T77WWW_GAHLC_STR-ROEMP sy-vline 
WA_T77WWW_GAHLC_STR-IVAPP sy-vline 
WA_T77WWW_GAHLC_STR-IEAPP sy-vline 
WA_T77WWW_GAHLC_STR-ROAPP sy-vline 
WA_T77WWW_GAHLC_STR-FLDOR sy-vline 
WA_T77WWW_GAHLC_STR-FEACT sy-vline 
WA_T77WWW_GAHLC_STR-DFVAL sy-vline 
WA_T77WWW_GAHLC_STR-FMTFV sy-vline      INTO ld_text SEPARATED BY SPACE.

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