ABAP Select data from SAP table ETPAR_GUI_C into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ETPAR_GUI_C
*  INTO TABLE @DATA(IT_ETPAR_GUI_C2).
*--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_ETPAR_GUI_C INDEX 1 INTO DATA(WA_ETPAR_GUI_C2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ETPAR_GUI_C>-PNAME = 1.
<ETPAR_GUI_C>-PTYP = 1.
<ETPAR_GUI_C>-PDESC = 1.
<ETPAR_GUI_C>-PINDEX = 1.
<ETPAR_GUI_C>-PGROUP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ETPAR_GUI_C-XMLREF_TYP, sy-vline,
  WA_ETPAR_GUI_C-PSTRUC_TYP, sy-vline,
  WA_ETPAR_GUI_C-PENV, sy-vline,
  WA_ETPAR_GUI_C-PREF_TYPE, sy-vline,
  WA_ETPAR_GUI_C-PREF_NAME, sy-vline,
  WA_ETPAR_GUI_C-PDOM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ETPAR_GUI_C 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_ETPAR_GUI_C 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_ETPAR_GUI_C INTO WA_ETPAR_GUI_C.


*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.

*Conversion exit DTYPE, internal->external for field PDATTYP
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_ETPAR_GUI_C-PDATTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ETPAR_GUI_C-PDATTYP.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_ETPAR_GUI_C_STR, 
PNAME TYPE STRING,
PTYP TYPE STRING,
PDESC TYPE STRING,
PINDEX TYPE STRING,
PGROUP TYPE STRING,
XMLREF_TYP TYPE STRING,
PSTRUC_TYP TYPE STRING,
PENV TYPE STRING,
PREF_TYPE TYPE STRING,
PREF_NAME TYPE STRING,
PDOM TYPE STRING,
PDATTYP TYPE STRING,
PDATLEN TYPE STRING,
PINTTYP TYPE STRING,
PINTLEN TYPE STRING,
PDECIMALS TYPE STRING,
OPTIONAL TYPE STRING,
SORT_LNR TYPE STRING,
TESTSYSTEM TYPE STRING,
PREF_NAME2 TYPE STRING,
ALIAS_FLAG TYPE STRING,
VALUE TYPE STRING,
VAL_TYPE TYPE STRING,
TAB_INDEX TYPE STRING,
DEF_EXT TYPE STRING,
VALUE_RUNTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ETPAR_GUI_C_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_ETPAR_GUI_C_STR-PNAME sy-vline 
WA_ETPAR_GUI_C_STR-PTYP sy-vline 
WA_ETPAR_GUI_C_STR-PDESC sy-vline 
WA_ETPAR_GUI_C_STR-PINDEX sy-vline 
WA_ETPAR_GUI_C_STR-PGROUP sy-vline 
WA_ETPAR_GUI_C_STR-XMLREF_TYP sy-vline 
WA_ETPAR_GUI_C_STR-PSTRUC_TYP sy-vline 
WA_ETPAR_GUI_C_STR-PENV sy-vline 
WA_ETPAR_GUI_C_STR-PREF_TYPE sy-vline 
WA_ETPAR_GUI_C_STR-PREF_NAME sy-vline 
WA_ETPAR_GUI_C_STR-PDOM sy-vline 
WA_ETPAR_GUI_C_STR-PDATTYP sy-vline 
WA_ETPAR_GUI_C_STR-PDATLEN sy-vline 
WA_ETPAR_GUI_C_STR-PINTTYP sy-vline 
WA_ETPAR_GUI_C_STR-PINTLEN sy-vline 
WA_ETPAR_GUI_C_STR-PDECIMALS sy-vline 
WA_ETPAR_GUI_C_STR-OPTIONAL sy-vline 
WA_ETPAR_GUI_C_STR-SORT_LNR sy-vline 
WA_ETPAR_GUI_C_STR-TESTSYSTEM sy-vline 
WA_ETPAR_GUI_C_STR-PREF_NAME2 sy-vline 
WA_ETPAR_GUI_C_STR-ALIAS_FLAG sy-vline 
WA_ETPAR_GUI_C_STR-VALUE sy-vline 
WA_ETPAR_GUI_C_STR-VAL_TYPE sy-vline 
WA_ETPAR_GUI_C_STR-TAB_INDEX sy-vline 
WA_ETPAR_GUI_C_STR-DEF_EXT sy-vline 
WA_ETPAR_GUI_C_STR-VALUE_RUNTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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