ABAP Select data from SAP table GLEX_EPARA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GLEX_EPARA
*  INTO TABLE @DATA(IT_GLEX_EPARA2).
*--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_GLEX_EPARA INDEX 1 INTO DATA(WA_GLEX_EPARA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GLEX_EPARA>-ITEMTEXT1 = 1.
<GLEX_EPARA>-ITEMTEXT2 = 1.
<GLEX_EPARA>-ITEMTEXT3 = 1.
<GLEX_EPARA>-ITEMTEXT4 = 1.
<GLEX_EPARA>-KWAER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GLEX_EPARA-NAME, sy-vline,
  WA_GLEX_EPARA-POPER, sy-vline,
  WA_GLEX_EPARA-RSUBD, sy-vline,
  WA_GLEX_EPARA-RVERS, sy-vline,
  WA_GLEX_EPARA-RYEAR, sy-vline,
  WA_GLEX_EPARA-SCRIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GLEX_EPARA 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_GLEX_EPARA 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_GLEX_EPARA INTO WA_GLEX_EPARA.


*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 ALPHA, internal->external for field RVERS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GLEX_EPARA-RVERS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GLEX_EPARA-RVERS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field RYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_GLEX_EPARA-RYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GLEX_EPARA-RYEAR.
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_GLEX_EPARA_STR, 
ITEMTEXT1 TYPE STRING,
ITEMTEXT2 TYPE STRING,
ITEMTEXT3 TYPE STRING,
ITEMTEXT4 TYPE STRING,
KWAER TYPE STRING,
NAME TYPE STRING,
POPER TYPE STRING,
RSUBD TYPE STRING,
RVERS TYPE STRING,
RYEAR TYPE STRING,
SCRIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GLEX_EPARA_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_GLEX_EPARA_STR-ITEMTEXT1 sy-vline 
WA_GLEX_EPARA_STR-ITEMTEXT2 sy-vline 
WA_GLEX_EPARA_STR-ITEMTEXT3 sy-vline 
WA_GLEX_EPARA_STR-ITEMTEXT4 sy-vline 
WA_GLEX_EPARA_STR-KWAER sy-vline 
WA_GLEX_EPARA_STR-NAME sy-vline 
WA_GLEX_EPARA_STR-POPER sy-vline 
WA_GLEX_EPARA_STR-RSUBD sy-vline 
WA_GLEX_EPARA_STR-RVERS sy-vline 
WA_GLEX_EPARA_STR-RYEAR sy-vline 
WA_GLEX_EPARA_STR-SCRIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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