ABAP Select data from SAP table E1HR_GNI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP E1HR_GNI 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 E1HR_GNI. 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 E1HR_GNI 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_E1HR_GNI TYPE STANDARD TABLE OF E1HR_GNI,
      WA_E1HR_GNI TYPE E1HR_GNI,
      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: <E1HR_GNI> TYPE E1HR_GNI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_E1HR_GNI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM E1HR_GNI
  INTO TABLE IT_E1HR_GNI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM E1HR_GNI
*  INTO TABLE @DATA(IT_E1HR_GNI2).
*--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_E1HR_GNI INDEX 1 INTO DATA(WA_E1HR_GNI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_E1HR_GNI ASSIGNING <E1HR_GNI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<E1HR_GNI>-BEGDA = 1.
<E1HR_GNI>-ENDDA = 1.
<E1HR_GNI>-NINUM = 1.
<E1HR_GNI>-NICAT = 1.
<E1HR_GNI>-NIPAY = 1.

ENDLOOP.

LOOP AT IT_E1HR_GNI INTO WA_E1HR_GNI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_E1HR_GNI-NICEE, sy-vline,
  WA_E1HR_GNI-NICER, sy-vline,
  WA_E1HR_GNI-NIARR, sy-vline,
  WA_E1HR_GNI-COEFG, sy-vline,
  WA_E1HR_GNI-DIRFB, sy-vline,
  WA_E1HR_GNI-NIDEF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_E1HR_GNI 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_E1HR_GNI 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_E1HR_GNI INTO WA_E1HR_GNI.


*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_E1HR_GNI_STR, 
BEGDA TYPE STRING,
ENDDA TYPE STRING,
NINUM TYPE STRING,
NICAT TYPE STRING,
NIPAY TYPE STRING,
NICEE TYPE STRING,
NICER TYPE STRING,
NIARR TYPE STRING,
COEFG TYPE STRING,
DIRFB TYPE STRING,
NIDEF TYPE STRING,
SPNIR TYPE STRING,
NIHCO TYPE STRING,
NIHBG TYPE STRING,
CA270 TYPE STRING,
CA271 TYPE STRING,
CTOUT TYPE STRING,
DIRRP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_E1HR_GNI_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_E1HR_GNI_STR-BEGDA sy-vline 
WA_E1HR_GNI_STR-ENDDA sy-vline 
WA_E1HR_GNI_STR-NINUM sy-vline 
WA_E1HR_GNI_STR-NICAT sy-vline 
WA_E1HR_GNI_STR-NIPAY sy-vline 
WA_E1HR_GNI_STR-NICEE sy-vline 
WA_E1HR_GNI_STR-NICER sy-vline 
WA_E1HR_GNI_STR-NIARR sy-vline 
WA_E1HR_GNI_STR-COEFG sy-vline 
WA_E1HR_GNI_STR-DIRFB sy-vline 
WA_E1HR_GNI_STR-NIDEF sy-vline 
WA_E1HR_GNI_STR-SPNIR sy-vline 
WA_E1HR_GNI_STR-NIHCO sy-vline 
WA_E1HR_GNI_STR-NIHBG sy-vline 
WA_E1HR_GNI_STR-CA270 sy-vline 
WA_E1HR_GNI_STR-CA271 sy-vline 
WA_E1HR_GNI_STR-CTOUT sy-vline 
WA_E1HR_GNI_STR-DIRRP sy-vline      INTO ld_text SEPARATED BY SPACE.

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