ABAP Select data from SAP table ESTST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESTST
*  INTO TABLE @DATA(IT_ESTST2).
*--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_ESTST INDEX 1 INTO DATA(WA_ESTST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESTST>-MANDT = 1.
<ESTST>-RECN = 1.
<ESTST>-ACTN = 1.
<ESTST>-VALFR = 1.
<ESTST>-VALTO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESTST-AENNR, sy-vline,
  WA_ESTST-DELFLG, sy-vline,
  WA_ESTST-PARKFLG, sy-vline,
  WA_ESTST-CRDAT, sy-vline,
  WA_ESTST-CRNAM, sy-vline,
  WA_ESTST-UPDDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESTST 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_ESTST 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_ESTST INTO WA_ESTST.


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

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

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

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

*Conversion exit ALPHA, internal->external for field RECNROOT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESTST-RECNROOT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESTST-RECNROOT.
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_ESTST_STR, 
MANDT TYPE STRING,
RECN TYPE STRING,
ACTN TYPE STRING,
VALFR TYPE STRING,
VALTO TYPE STRING,
AENNR TYPE STRING,
DELFLG TYPE STRING,
PARKFLG TYPE STRING,
CRDAT TYPE STRING,
CRNAM TYPE STRING,
UPDDAT TYPE STRING,
UPDNAM TYPE STRING,
SRSID TYPE STRING,
OWNID TYPE STRING,
RECNROOT TYPE STRING,
OBJNR TYPE STRING,
SUBSTAT TYPE STRING,
RVLID TYPE STRING,
VACLID TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
REALO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESTST_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_ESTST_STR-MANDT sy-vline 
WA_ESTST_STR-RECN sy-vline 
WA_ESTST_STR-ACTN sy-vline 
WA_ESTST_STR-VALFR sy-vline 
WA_ESTST_STR-VALTO sy-vline 
WA_ESTST_STR-AENNR sy-vline 
WA_ESTST_STR-DELFLG sy-vline 
WA_ESTST_STR-PARKFLG sy-vline 
WA_ESTST_STR-CRDAT sy-vline 
WA_ESTST_STR-CRNAM sy-vline 
WA_ESTST_STR-UPDDAT sy-vline 
WA_ESTST_STR-UPDNAM sy-vline 
WA_ESTST_STR-SRSID sy-vline 
WA_ESTST_STR-OWNID sy-vline 
WA_ESTST_STR-RECNROOT sy-vline 
WA_ESTST_STR-OBJNR sy-vline 
WA_ESTST_STR-SUBSTAT sy-vline 
WA_ESTST_STR-RVLID sy-vline 
WA_ESTST_STR-VACLID sy-vline 
WA_ESTST_STR-PLVAR sy-vline 
WA_ESTST_STR-OTYPE sy-vline 
WA_ESTST_STR-REALO sy-vline      INTO ld_text SEPARATED BY SPACE.

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