ABAP Select data from SAP table ESSR_TREE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESSR_TREE
*  INTO TABLE @DATA(IT_ESSR_TREE2).
*--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_ESSR_TREE INDEX 1 INTO DATA(WA_ESSR_TREE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESSR_TREE>-LIFNR = 1.
<ESSR_TREE>-NAME1 = 1.
<ESSR_TREE>-EBELN = 1.
<ESSR_TREE>-EBELP = 1.
<ESSR_TREE>-LBLNI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESSR_TREE-LBLNE, sy-vline,
  WA_ESSR_TREE-SBNAMAG, sy-vline,
  WA_ESSR_TREE-SBNAMAN, sy-vline,
  WA_ESSR_TREE-DLORT, sy-vline,
  WA_ESSR_TREE-LBLDT, sy-vline,
  WA_ESSR_TREE-LZVON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESSR_TREE 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_ESSR_TREE 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_ESSR_TREE INTO WA_ESSR_TREE.


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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field SPEC_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESSR_TREE-SPEC_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESSR_TREE-SPEC_NO.
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_ESSR_TREE_STR, 
LIFNR TYPE STRING,
NAME1 TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
LBLNI TYPE STRING,
LBLNE TYPE STRING,
SBNAMAG TYPE STRING,
SBNAMAN TYPE STRING,
DLORT TYPE STRING,
LBLDT TYPE STRING,
LZVON TYPE STRING,
LZBIS TYPE STRING,
LWERT TYPE STRING,
UWERT TYPE STRING,
UNPLV TYPE STRING,
NETWR TYPE STRING,
WAERS TYPE STRING,
TXZ01 TYPE STRING,
LOEKZ TYPE STRING,
KZABN TYPE STRING,
PWWE TYPE STRING,
PWFR TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
XBLNR TYPE STRING,
BKTXT TYPE STRING,
KNTTP TYPE STRING,
BANFN TYPE STRING,
BNFPO TYPE STRING,
WARPL TYPE STRING,
WAPOS TYPE STRING,
ABNUM TYPE STRING,
FKNUM TYPE STRING,
FKPOS TYPE STRING,
SPEC_NO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESSR_TREE_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_ESSR_TREE_STR-LIFNR sy-vline 
WA_ESSR_TREE_STR-NAME1 sy-vline 
WA_ESSR_TREE_STR-EBELN sy-vline 
WA_ESSR_TREE_STR-EBELP sy-vline 
WA_ESSR_TREE_STR-LBLNI sy-vline 
WA_ESSR_TREE_STR-LBLNE sy-vline 
WA_ESSR_TREE_STR-SBNAMAG sy-vline 
WA_ESSR_TREE_STR-SBNAMAN sy-vline 
WA_ESSR_TREE_STR-DLORT sy-vline 
WA_ESSR_TREE_STR-LBLDT sy-vline 
WA_ESSR_TREE_STR-LZVON sy-vline 
WA_ESSR_TREE_STR-LZBIS sy-vline 
WA_ESSR_TREE_STR-LWERT sy-vline 
WA_ESSR_TREE_STR-UWERT sy-vline 
WA_ESSR_TREE_STR-UNPLV sy-vline 
WA_ESSR_TREE_STR-NETWR sy-vline 
WA_ESSR_TREE_STR-WAERS sy-vline 
WA_ESSR_TREE_STR-TXZ01 sy-vline 
WA_ESSR_TREE_STR-LOEKZ sy-vline 
WA_ESSR_TREE_STR-KZABN sy-vline 
WA_ESSR_TREE_STR-PWWE sy-vline 
WA_ESSR_TREE_STR-PWFR sy-vline 
WA_ESSR_TREE_STR-BLDAT sy-vline 
WA_ESSR_TREE_STR-BUDAT sy-vline 
WA_ESSR_TREE_STR-XBLNR sy-vline 
WA_ESSR_TREE_STR-BKTXT sy-vline 
WA_ESSR_TREE_STR-KNTTP sy-vline 
WA_ESSR_TREE_STR-BANFN sy-vline 
WA_ESSR_TREE_STR-BNFPO sy-vline 
WA_ESSR_TREE_STR-WARPL sy-vline 
WA_ESSR_TREE_STR-WAPOS sy-vline 
WA_ESSR_TREE_STR-ABNUM sy-vline 
WA_ESSR_TREE_STR-FKNUM sy-vline 
WA_ESSR_TREE_STR-FKPOS sy-vline 
WA_ESSR_TREE_STR-SPEC_NO sy-vline      INTO ld_text SEPARATED BY SPACE.

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