ABAP Select data from SAP table ESH_L_CHG_NMBR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESH_L_CHG_NMBR
*  INTO TABLE @DATA(IT_ESH_L_CHG_NMBR2).
*--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_ESH_L_CHG_NMBR INDEX 1 INTO DATA(WA_ESH_L_CHG_NMBR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESH_L_CHG_NMBR>-MANDT = 1.
<ESH_L_CHG_NMBR>-CHANGENUMBER = 1.
<ESH_L_CHG_NMBR>-AUTHORIZATIONGROUP = 1.
<ESH_L_CHG_NMBR>-CHANGENUMBERCREATEDBYUSER = 1.
<ESH_L_CHG_NMBR>-CHANGENUMBERCREATIONDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESH_L_CHG_NMBR-CHANGENUMBERDESCRIPTION, sy-vline,
  WA_ESH_L_CHG_NMBR-CHANGENUMBERFUNCTION, sy-vline,
  WA_ESH_L_CHG_NMBR-CHANGENUMBERFUNCTIONTEXT, sy-vline,
  WA_ESH_L_CHG_NMBR-CHANGENUMBERISMRKDFORDELETION, sy-vline,
  WA_ESH_L_CHG_NMBR-CHANGENUMBERLASTCHANGEDBYUSER, sy-vline,
  WA_ESH_L_CHG_NMBR-CHANGENUMBERLASTCHANGEDDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESH_L_CHG_NMBR 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_ESH_L_CHG_NMBR 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_ESH_L_CHG_NMBR INTO WA_ESH_L_CHG_NMBR.


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

*Conversion exit ALPHA, internal->external for field DOCUMENTINFORECORDDOCNUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_L_CHG_NMBR-DOCUMENTINFORECORDDOCNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_L_CHG_NMBR-DOCUMENTINFORECORDDOCNUMBER.
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_ESH_L_CHG_NMBR_STR, 
MANDT TYPE STRING,
CHANGENUMBER TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
CHANGENUMBERCREATEDBYUSER TYPE STRING,
CHANGENUMBERCREATIONDATE TYPE STRING,
CHANGENUMBERDESCRIPTION TYPE STRING,
CHANGENUMBERFUNCTION TYPE STRING,
CHANGENUMBERFUNCTIONTEXT TYPE STRING,
CHANGENUMBERISMRKDFORDELETION TYPE STRING,
CHANGENUMBERLASTCHANGEDBYUSER TYPE STRING,
CHANGENUMBERLASTCHANGEDDATE TYPE STRING,
CHANGENUMBEROBJECTTYPE TYPE STRING,
CHANGENUMBERRELEASEKEY TYPE STRING,
CHANGENUMBERRELEASEKEYTEXT TYPE STRING,
CHANGENUMBERSTATUS TYPE STRING,
CHANGENUMBERSTATUSTEXT TYPE STRING,
CHANGENUMBERVALIDFROMDATE TYPE STRING,
CHARACTERISTIC TYPE STRING,
CHARCDESCRIPTION TYPE STRING,
CHARCVALUE TYPE STRING,
CHARCVALUEDESCRIPTION TYPE STRING,
CLASS TYPE STRING,
CLASSKEYWORDTEXT TYPE STRING,
CLASSTYPE TYPE STRING,
DOCUMENTDESCRIPTION TYPE STRING,
DOCUMENTINFORECORDDOCNUMBER TYPE STRING,
DOCUMENTINFORECORDDOCPART TYPE STRING,
DOCUMENTINFORECORDDOCTYPE TYPE STRING,
DOCUMENTINFORECORDDOCVERSION TYPE STRING,
LOGACCMOBJECTTYPE TYPE STRING,
LOGACCMOBJECTTYPEISACTIVE TYPE STRING,
LOGACCMUSERAUTHZNOBJECT TYPE STRING,
REASONFORCHANGETEXT TYPE STRING,
CREATEDBYUSERNAME TYPE STRING,
LASTCHANGEDBYUSERNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESH_L_CHG_NMBR_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_ESH_L_CHG_NMBR_STR-MANDT sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBER sy-vline 
WA_ESH_L_CHG_NMBR_STR-AUTHORIZATIONGROUP sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERCREATEDBYUSER sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERCREATIONDATE sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERDESCRIPTION sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERFUNCTION sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERFUNCTIONTEXT sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERISMRKDFORDELETION sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERLASTCHANGEDBYUSER sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERLASTCHANGEDDATE sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBEROBJECTTYPE sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERRELEASEKEY sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERRELEASEKEYTEXT sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERSTATUS sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERSTATUSTEXT sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHANGENUMBERVALIDFROMDATE sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHARACTERISTIC sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHARCDESCRIPTION sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHARCVALUE sy-vline 
WA_ESH_L_CHG_NMBR_STR-CHARCVALUEDESCRIPTION sy-vline 
WA_ESH_L_CHG_NMBR_STR-CLASS sy-vline 
WA_ESH_L_CHG_NMBR_STR-CLASSKEYWORDTEXT sy-vline 
WA_ESH_L_CHG_NMBR_STR-CLASSTYPE sy-vline 
WA_ESH_L_CHG_NMBR_STR-DOCUMENTDESCRIPTION sy-vline 
WA_ESH_L_CHG_NMBR_STR-DOCUMENTINFORECORDDOCNUMBER sy-vline 
WA_ESH_L_CHG_NMBR_STR-DOCUMENTINFORECORDDOCPART sy-vline 
WA_ESH_L_CHG_NMBR_STR-DOCUMENTINFORECORDDOCTYPE sy-vline 
WA_ESH_L_CHG_NMBR_STR-DOCUMENTINFORECORDDOCVERSION sy-vline 
WA_ESH_L_CHG_NMBR_STR-LOGACCMOBJECTTYPE sy-vline 
WA_ESH_L_CHG_NMBR_STR-LOGACCMOBJECTTYPEISACTIVE sy-vline 
WA_ESH_L_CHG_NMBR_STR-LOGACCMUSERAUTHZNOBJECT sy-vline 
WA_ESH_L_CHG_NMBR_STR-REASONFORCHANGETEXT sy-vline 
WA_ESH_L_CHG_NMBR_STR-CREATEDBYUSERNAME sy-vline 
WA_ESH_L_CHG_NMBR_STR-LASTCHANGEDBYUSERNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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