ABAP Select data from SAP table EST_CHANGE_DOCS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EST_CHANGE_DOCS
*  INTO TABLE @DATA(IT_EST_CHANGE_DOCS2).
*--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_EST_CHANGE_DOCS INDEX 1 INTO DATA(WA_EST_CHANGE_DOCS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EST_CHANGE_DOCS>-MANDT = 1.
<EST_CHANGE_DOCS>-CHANGENR = 1.
<EST_CHANGE_DOCS>-SUBID = 1.
<EST_CHANGE_DOCS>-CHNG_RECN = 1.
<EST_CHANGE_DOCS>-CHNG_ACTN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EST_CHANGE_DOCS-CHNG_ATKEY, sy-vline,
  WA_EST_CHANGE_DOCS-FNAME, sy-vline,
  WA_EST_CHANGE_DOCS-TABNAME, sy-vline,
  WA_EST_CHANGE_DOCS-CHNGIND, sy-vline,
  WA_EST_CHANGE_DOCS-USERNAME, sy-vline,
  WA_EST_CHANGE_DOCS-UDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EST_CHANGE_DOCS 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_EST_CHANGE_DOCS 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_EST_CHANGE_DOCS INTO WA_EST_CHANGE_DOCS.


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

*Conversion exit SPEC1, internal->external for field SUBID
CALL FUNCTION 'CONVERSION_EXIT_SPEC1_OUTPUT'
  EXPORTING
    input =                      WA_EST_CHANGE_DOCS-SUBID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EST_CHANGE_DOCS-SUBID.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit SPEC1, internal->external for field REFERENCE
CALL FUNCTION 'CONVERSION_EXIT_SPEC1_OUTPUT'
  EXPORTING
    input =                      WA_EST_CHANGE_DOCS-REFERENCE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EST_CHANGE_DOCS-REFERENCE.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_EST_CHANGE_DOCS-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EST_CHANGE_DOCS-LANGU.
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_EST_CHANGE_DOCS_STR, 
MANDT TYPE STRING,
CHANGENR TYPE STRING,
SUBID TYPE STRING,
CHNG_RECN TYPE STRING,
CHNG_ACTN TYPE STRING,
CHNG_ATKEY TYPE STRING,
FNAME TYPE STRING,
TABNAME TYPE STRING,
CHNGIND TYPE STRING,
USERNAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
VALFR TYPE STRING,
VALTO TYPE STRING,
VALUE_OLD TYPE STRING,
VALUE_NEW TYPE STRING,
CONTEXT TYPE STRING,
ESTCAT TYPE STRING,
ATNAM TYPE STRING,
IDENT TYPE STRING,
REFERENCE TYPE STRING,
MASTER_TAB TYPE STRING,
MASTER_RECN TYPE STRING,
SORT TYPE STRING,
LANGU TYPE STRING,
TEXT_CASE TYPE STRING,
CHANGED_BY TYPE STRING,
BAD_CONTEXT TYPE STRING,
PHRASE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EST_CHANGE_DOCS_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_EST_CHANGE_DOCS_STR-MANDT sy-vline 
WA_EST_CHANGE_DOCS_STR-CHANGENR sy-vline 
WA_EST_CHANGE_DOCS_STR-SUBID sy-vline 
WA_EST_CHANGE_DOCS_STR-CHNG_RECN sy-vline 
WA_EST_CHANGE_DOCS_STR-CHNG_ACTN sy-vline 
WA_EST_CHANGE_DOCS_STR-CHNG_ATKEY sy-vline 
WA_EST_CHANGE_DOCS_STR-FNAME sy-vline 
WA_EST_CHANGE_DOCS_STR-TABNAME sy-vline 
WA_EST_CHANGE_DOCS_STR-CHNGIND sy-vline 
WA_EST_CHANGE_DOCS_STR-USERNAME sy-vline 
WA_EST_CHANGE_DOCS_STR-UDATE sy-vline 
WA_EST_CHANGE_DOCS_STR-UTIME sy-vline 
WA_EST_CHANGE_DOCS_STR-VALFR sy-vline 
WA_EST_CHANGE_DOCS_STR-VALTO sy-vline 
WA_EST_CHANGE_DOCS_STR-VALUE_OLD sy-vline 
WA_EST_CHANGE_DOCS_STR-VALUE_NEW sy-vline 
WA_EST_CHANGE_DOCS_STR-CONTEXT sy-vline 
WA_EST_CHANGE_DOCS_STR-ESTCAT sy-vline 
WA_EST_CHANGE_DOCS_STR-ATNAM sy-vline 
WA_EST_CHANGE_DOCS_STR-IDENT sy-vline 
WA_EST_CHANGE_DOCS_STR-REFERENCE sy-vline 
WA_EST_CHANGE_DOCS_STR-MASTER_TAB sy-vline 
WA_EST_CHANGE_DOCS_STR-MASTER_RECN sy-vline 
WA_EST_CHANGE_DOCS_STR-SORT sy-vline 
WA_EST_CHANGE_DOCS_STR-LANGU sy-vline 
WA_EST_CHANGE_DOCS_STR-TEXT_CASE sy-vline 
WA_EST_CHANGE_DOCS_STR-CHANGED_BY sy-vline 
WA_EST_CHANGE_DOCS_STR-BAD_CONTEXT sy-vline 
WA_EST_CHANGE_DOCS_STR-PHRASE sy-vline      INTO ld_text SEPARATED BY SPACE.

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