ABAP Select data from SAP table MCESTA_ERCHZ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCESTA_ERCHZ
*  INTO TABLE @DATA(IT_MCESTA_ERCHZ2).
*--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_MCESTA_ERCHZ INDEX 1 INTO DATA(WA_MCESTA_ERCHZ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCESTA_ERCHZ>-BELZEILE = 1.
<MCESTA_ERCHZ>-BELZART = 1.
<MCESTA_ERCHZ>-AKLASSE = 1.
<MCESTA_ERCHZ>-BRANCHE = 1.
<MCESTA_ERCHZ>-TVORG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCESTA_ERCHZ-EQUNR, sy-vline,
  WA_MCESTA_ERCHZ-GERAET, sy-vline,
  WA_MCESTA_ERCHZ-MATNR, sy-vline,
  WA_MCESTA_ERCHZ-SAISON, sy-vline,
  WA_MCESTA_ERCHZ-VONZONE, sy-vline,
  WA_MCESTA_ERCHZ-BISZONE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCESTA_ERCHZ 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_MCESTA_ERCHZ 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_MCESTA_ERCHZ INTO WA_MCESTA_ERCHZ.


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

*Conversion exit GERNR, internal->external for field GERAET
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_MCESTA_ERCHZ-GERAET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCESTA_ERCHZ-GERAET.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ABPSP, internal->external for field PS_PSP_PNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MCESTA_ERCHZ-PS_PSP_PNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCESTA_ERCHZ-PS_PSP_PNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCESTA_ERCHZ-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCESTA_ERCHZ-AUFNR.
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_MCESTA_ERCHZ_STR, 
BELZEILE TYPE STRING,
BELZART TYPE STRING,
AKLASSE TYPE STRING,
BRANCHE TYPE STRING,
TVORG TYPE STRING,
EQUNR TYPE STRING,
GERAET TYPE STRING,
MATNR TYPE STRING,
SAISON TYPE STRING,
VONZONE TYPE STRING,
BISZONE TYPE STRING,
ZONENNR TYPE STRING,
FRAN_TYPE TYPE STRING,
KONZIGR TYPE STRING,
TARIFTYP TYPE STRING,
STATTART TYPE STRING,
TARIFNR TYPE STRING,
KONDIGR TYPE STRING,
STTARIF TYPE STRING,
AB TYPE STRING,
BIS TYPE STRING,
ZUORDDAT TYPE STRING,
DIFFKZ TYPE STRING,
BUCHREL TYPE STRING,
STGRQNT TYPE STRING,
STGRAMT TYPE STRING,
TWAERS TYPE STRING,
ARTMENGE TYPE STRING,
GSBER TYPE STRING,
KOSTL TYPE STRING,
PRCTR TYPE STRING,
PS_PSP_PNR TYPE STRING,
AUFNR TYPE STRING,
PAOBJNR TYPE STRING,
PAOBJNR_S TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCESTA_ERCHZ_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_MCESTA_ERCHZ_STR-BELZEILE sy-vline 
WA_MCESTA_ERCHZ_STR-BELZART sy-vline 
WA_MCESTA_ERCHZ_STR-AKLASSE sy-vline 
WA_MCESTA_ERCHZ_STR-BRANCHE sy-vline 
WA_MCESTA_ERCHZ_STR-TVORG sy-vline 
WA_MCESTA_ERCHZ_STR-EQUNR sy-vline 
WA_MCESTA_ERCHZ_STR-GERAET sy-vline 
WA_MCESTA_ERCHZ_STR-MATNR sy-vline 
WA_MCESTA_ERCHZ_STR-SAISON sy-vline 
WA_MCESTA_ERCHZ_STR-VONZONE sy-vline 
WA_MCESTA_ERCHZ_STR-BISZONE sy-vline 
WA_MCESTA_ERCHZ_STR-ZONENNR sy-vline 
WA_MCESTA_ERCHZ_STR-FRAN_TYPE sy-vline 
WA_MCESTA_ERCHZ_STR-KONZIGR sy-vline 
WA_MCESTA_ERCHZ_STR-TARIFTYP sy-vline 
WA_MCESTA_ERCHZ_STR-STATTART sy-vline 
WA_MCESTA_ERCHZ_STR-TARIFNR sy-vline 
WA_MCESTA_ERCHZ_STR-KONDIGR sy-vline 
WA_MCESTA_ERCHZ_STR-STTARIF sy-vline 
WA_MCESTA_ERCHZ_STR-AB sy-vline 
WA_MCESTA_ERCHZ_STR-BIS sy-vline 
WA_MCESTA_ERCHZ_STR-ZUORDDAT sy-vline 
WA_MCESTA_ERCHZ_STR-DIFFKZ sy-vline 
WA_MCESTA_ERCHZ_STR-BUCHREL sy-vline 
WA_MCESTA_ERCHZ_STR-STGRQNT sy-vline 
WA_MCESTA_ERCHZ_STR-STGRAMT sy-vline 
WA_MCESTA_ERCHZ_STR-TWAERS sy-vline 
WA_MCESTA_ERCHZ_STR-ARTMENGE sy-vline 
WA_MCESTA_ERCHZ_STR-GSBER sy-vline 
WA_MCESTA_ERCHZ_STR-KOSTL sy-vline 
WA_MCESTA_ERCHZ_STR-PRCTR sy-vline 
WA_MCESTA_ERCHZ_STR-PS_PSP_PNR sy-vline 
WA_MCESTA_ERCHZ_STR-AUFNR sy-vline 
WA_MCESTA_ERCHZ_STR-PAOBJNR sy-vline 
WA_MCESTA_ERCHZ_STR-PAOBJNR_S sy-vline      INTO ld_text SEPARATED BY SPACE.

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