ABAP Select data from SAP table MCESSR into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCESSR 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 MCESSR. 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 MCESSR 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_MCESSR TYPE STANDARD TABLE OF MCESSR,
      WA_MCESSR TYPE MCESSR,
      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: <MCESSR> TYPE MCESSR.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCESSR
*  INTO TABLE @DATA(IT_MCESSR2).
*--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_MCESSR INDEX 1 INTO DATA(WA_MCESSR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCESSR>-MANDT = 1.
<MCESSR>-LBLNI = 1.
<MCESSR>-ERNAM = 1.
<MCESSR>-ERDAT = 1.
<MCESSR>-AEDAT = 1.

ENDLOOP.

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

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


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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field SPEC_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCESSR-SPEC_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCESSR-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_MCESSR_STR, 
MANDT TYPE STRING,
LBLNI TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AEDAT TYPE STRING,
AENAM 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,
WAERS TYPE STRING,
PACKNO TYPE STRING,
TXZ01 TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
LOEKZ TYPE STRING,
KZABN TYPE STRING,
FINAL TYPE STRING,
FRGGR TYPE STRING,
FRGSX TYPE STRING,
FRGKL TYPE STRING,
FRGZU TYPE STRING,
FRGRL TYPE STRING,
F_LOCK TYPE STRING,
PWWE TYPE STRING,
PWFR TYPE STRING,
BLDAT TYPE STRING,
BUDAT TYPE STRING,
XBLNR TYPE STRING,
BKTXT TYPE STRING,
KNTTP TYPE STRING,
KZVBR TYPE STRING,
NETWR TYPE STRING,
BANFN TYPE STRING,
BNFPO TYPE STRING,
WARPL TYPE STRING,
WAPOS TYPE STRING,
ABNUM TYPE STRING,
FKNUM TYPE STRING,
FKPOS TYPE STRING,
USER1 TYPE STRING,
USER2 TYPE STRING,
NAVNW TYPE STRING,
SPEC_NO TYPE STRING,
CUOBJ TYPE STRING,
LEMIN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCESSR_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_MCESSR_STR-MANDT sy-vline 
WA_MCESSR_STR-LBLNI sy-vline 
WA_MCESSR_STR-ERNAM sy-vline 
WA_MCESSR_STR-ERDAT sy-vline 
WA_MCESSR_STR-AEDAT sy-vline 
WA_MCESSR_STR-AENAM sy-vline 
WA_MCESSR_STR-SBNAMAG sy-vline 
WA_MCESSR_STR-SBNAMAN sy-vline 
WA_MCESSR_STR-DLORT sy-vline 
WA_MCESSR_STR-LBLDT sy-vline 
WA_MCESSR_STR-LZVON sy-vline 
WA_MCESSR_STR-LZBIS sy-vline 
WA_MCESSR_STR-LWERT sy-vline 
WA_MCESSR_STR-UWERT sy-vline 
WA_MCESSR_STR-UNPLV sy-vline 
WA_MCESSR_STR-WAERS sy-vline 
WA_MCESSR_STR-PACKNO sy-vline 
WA_MCESSR_STR-TXZ01 sy-vline 
WA_MCESSR_STR-EBELN sy-vline 
WA_MCESSR_STR-EBELP sy-vline 
WA_MCESSR_STR-LOEKZ sy-vline 
WA_MCESSR_STR-KZABN sy-vline 
WA_MCESSR_STR-FINAL sy-vline 
WA_MCESSR_STR-FRGGR sy-vline 
WA_MCESSR_STR-FRGSX sy-vline 
WA_MCESSR_STR-FRGKL sy-vline 
WA_MCESSR_STR-FRGZU sy-vline 
WA_MCESSR_STR-FRGRL sy-vline 
WA_MCESSR_STR-F_LOCK sy-vline 
WA_MCESSR_STR-PWWE sy-vline 
WA_MCESSR_STR-PWFR sy-vline 
WA_MCESSR_STR-BLDAT sy-vline 
WA_MCESSR_STR-BUDAT sy-vline 
WA_MCESSR_STR-XBLNR sy-vline 
WA_MCESSR_STR-BKTXT sy-vline 
WA_MCESSR_STR-KNTTP sy-vline 
WA_MCESSR_STR-KZVBR sy-vline 
WA_MCESSR_STR-NETWR sy-vline 
WA_MCESSR_STR-BANFN sy-vline 
WA_MCESSR_STR-BNFPO sy-vline 
WA_MCESSR_STR-WARPL sy-vline 
WA_MCESSR_STR-WAPOS sy-vline 
WA_MCESSR_STR-ABNUM sy-vline 
WA_MCESSR_STR-FKNUM sy-vline 
WA_MCESSR_STR-FKPOS sy-vline 
WA_MCESSR_STR-USER1 sy-vline 
WA_MCESSR_STR-USER2 sy-vline 
WA_MCESSR_STR-NAVNW sy-vline 
WA_MCESSR_STR-SPEC_NO sy-vline 
WA_MCESSR_STR-CUOBJ sy-vline 
WA_MCESSR_STR-LEMIN sy-vline      INTO ld_text SEPARATED BY SPACE.

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