ABAP Select data from SAP table ERS_HEAD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ERS_HEAD
*  INTO TABLE @DATA(IT_ERS_HEAD2).
*--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_ERS_HEAD INDEX 1 INTO DATA(WA_ERS_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ERS_HEAD>-EBELN = 1.
<ERS_HEAD>-EBELP = 1.
<ERS_HEAD>-EKORG = 1.
<ERS_HEAD>-LIFNR = 1.
<ERS_HEAD>-LIFNR_NAME1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ERS_HEAD-LIFRE, sy-vline,
  WA_ERS_HEAD-LIFRE_NAME1, sy-vline,
  WA_ERS_HEAD-LLIEF, sy-vline,
  WA_ERS_HEAD-LLIEF_NAME1, sy-vline,
  WA_ERS_HEAD-BUKRS, sy-vline,
  WA_ERS_HEAD-VALID_PRO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ERS_HEAD 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_ERS_HEAD 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_ERS_HEAD INTO WA_ERS_HEAD.


*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 EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ERS_HEAD-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERS_HEAD-EBELN.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit EXCRT, internal->external for field WKURS
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_ERS_HEAD-WKURS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERS_HEAD-WKURS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ERS_HEAD-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERS_HEAD-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FILKD
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ERS_HEAD-FILKD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ERS_HEAD-FILKD.
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_ERS_HEAD_STR, 
EBELN TYPE STRING,
EBELP TYPE STRING,
EKORG TYPE STRING,
LIFNR TYPE STRING,
LIFNR_NAME1 TYPE STRING,
LIFRE TYPE STRING,
LIFRE_NAME1 TYPE STRING,
LLIEF TYPE STRING,
LLIEF_NAME1 TYPE STRING,
BUKRS TYPE STRING,
VALID_PRO TYPE STRING,
HSCABS TYPE STRING,
HSCPE TYPE STRING,
HSCMIN TYPE STRING,
HSCMAX TYPE STRING,
ERSBA TYPE STRING,
ZTERM TYPE STRING,
WKURS TYPE STRING,
KUFIX TYPE STRING,
MATNR TYPE STRING,
TXZ01 TYPE STRING,
WERKS TYPE STRING,
TXJCD TYPE STRING,
RETPO TYPE STRING,
MEPRF TYPE STRING,
PSTYP TYPE STRING,
QSSKZ TYPE STRING,
FILKD TYPE STRING,
WAERS TYPE STRING,
SPACE_1 TYPE STRING,
SPACE_2 TYPE STRING,
SPACE_3 TYPE STRING,
SPACE_4 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ERS_HEAD_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_ERS_HEAD_STR-EBELN sy-vline 
WA_ERS_HEAD_STR-EBELP sy-vline 
WA_ERS_HEAD_STR-EKORG sy-vline 
WA_ERS_HEAD_STR-LIFNR sy-vline 
WA_ERS_HEAD_STR-LIFNR_NAME1 sy-vline 
WA_ERS_HEAD_STR-LIFRE sy-vline 
WA_ERS_HEAD_STR-LIFRE_NAME1 sy-vline 
WA_ERS_HEAD_STR-LLIEF sy-vline 
WA_ERS_HEAD_STR-LLIEF_NAME1 sy-vline 
WA_ERS_HEAD_STR-BUKRS sy-vline 
WA_ERS_HEAD_STR-VALID_PRO sy-vline 
WA_ERS_HEAD_STR-HSCABS sy-vline 
WA_ERS_HEAD_STR-HSCPE sy-vline 
WA_ERS_HEAD_STR-HSCMIN sy-vline 
WA_ERS_HEAD_STR-HSCMAX sy-vline 
WA_ERS_HEAD_STR-ERSBA sy-vline 
WA_ERS_HEAD_STR-ZTERM sy-vline 
WA_ERS_HEAD_STR-WKURS sy-vline 
WA_ERS_HEAD_STR-KUFIX sy-vline 
WA_ERS_HEAD_STR-MATNR sy-vline 
WA_ERS_HEAD_STR-TXZ01 sy-vline 
WA_ERS_HEAD_STR-WERKS sy-vline 
WA_ERS_HEAD_STR-TXJCD sy-vline 
WA_ERS_HEAD_STR-RETPO sy-vline 
WA_ERS_HEAD_STR-MEPRF sy-vline 
WA_ERS_HEAD_STR-PSTYP sy-vline 
WA_ERS_HEAD_STR-QSSKZ sy-vline 
WA_ERS_HEAD_STR-FILKD sy-vline 
WA_ERS_HEAD_STR-WAERS sy-vline 
WA_ERS_HEAD_STR-SPACE_1 sy-vline 
WA_ERS_HEAD_STR-SPACE_2 sy-vline 
WA_ERS_HEAD_STR-SPACE_3 sy-vline 
WA_ERS_HEAD_STR-SPACE_4 sy-vline      INTO ld_text SEPARATED BY SPACE.

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