ABAP Select data from SAP table MCESUH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCESUH
*  INTO TABLE @DATA(IT_MCESUH2).
*--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_MCESUH INDEX 1 INTO DATA(WA_MCESUH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCESUH>-MANDT = 1.
<MCESUH>-PACKNO = 1.
<MCESUH>-PLN_PACKNO = 1.
<MCESUH>-SUMLIMIT = 1.
<MCESUH>-SUMNOLIM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCESUH-COMMITMENT, sy-vline,
  WA_MCESUH-ACTVALUE, sy-vline,
  WA_MCESUH-ST_EXIT, sy-vline,
  WA_MCESUH-VC_EXIST, sy-vline,
  WA_MCESUH-PK_EXIST, sy-vline,
  WA_MCESUH-PRS_CHG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCESUH 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_MCESUH 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_MCESUH INTO WA_MCESUH.


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

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

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCESUH-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCESUH-EBELN.
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_MCESUH_STR, 
MANDT TYPE STRING,
PACKNO TYPE STRING,
PLN_PACKNO TYPE STRING,
SUMLIMIT TYPE STRING,
SUMNOLIM TYPE STRING,
COMMITMENT TYPE STRING,
ACTVALUE TYPE STRING,
ST_EXIT TYPE STRING,
VC_EXIST TYPE STRING,
PK_EXIST TYPE STRING,
PRS_CHG TYPE STRING,
RESTLIMIT TYPE STRING,
RESTNOLIM TYPE STRING,
RESTACT TYPE STRING,
WAERS TYPE STRING,
LBNUM TYPE STRING,
AUSGB TYPE STRING,
LBLIMIT TYPE STRING,
LBNOLIM TYPE STRING,
ACTLBLIM TYPE STRING,
PRS_CHG_LB TYPE STRING,
SPEC_NO TYPE STRING,
SPECLIMIT TYPE STRING,
PRS_CHG_MU TYPE STRING,
TMP_PROZ TYPE STRING,
LB_PROZ TYPE STRING,
CONT_PROZ TYPE STRING,
SPECNOLIM TYPE STRING,
ACTSPLIM TYPE STRING,
MWSKZ TYPE STRING,
TXJCD TYPE STRING,
NAVNW TYPE STRING,
KSTAR TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
SUMNOLIMIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCESUH_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_MCESUH_STR-MANDT sy-vline 
WA_MCESUH_STR-PACKNO sy-vline 
WA_MCESUH_STR-PLN_PACKNO sy-vline 
WA_MCESUH_STR-SUMLIMIT sy-vline 
WA_MCESUH_STR-SUMNOLIM sy-vline 
WA_MCESUH_STR-COMMITMENT sy-vline 
WA_MCESUH_STR-ACTVALUE sy-vline 
WA_MCESUH_STR-ST_EXIT sy-vline 
WA_MCESUH_STR-VC_EXIST sy-vline 
WA_MCESUH_STR-PK_EXIST sy-vline 
WA_MCESUH_STR-PRS_CHG sy-vline 
WA_MCESUH_STR-RESTLIMIT sy-vline 
WA_MCESUH_STR-RESTNOLIM sy-vline 
WA_MCESUH_STR-RESTACT sy-vline 
WA_MCESUH_STR-WAERS sy-vline 
WA_MCESUH_STR-LBNUM sy-vline 
WA_MCESUH_STR-AUSGB sy-vline 
WA_MCESUH_STR-LBLIMIT sy-vline 
WA_MCESUH_STR-LBNOLIM sy-vline 
WA_MCESUH_STR-ACTLBLIM sy-vline 
WA_MCESUH_STR-PRS_CHG_LB sy-vline 
WA_MCESUH_STR-SPEC_NO sy-vline 
WA_MCESUH_STR-SPECLIMIT sy-vline 
WA_MCESUH_STR-PRS_CHG_MU sy-vline 
WA_MCESUH_STR-TMP_PROZ sy-vline 
WA_MCESUH_STR-LB_PROZ sy-vline 
WA_MCESUH_STR-CONT_PROZ sy-vline 
WA_MCESUH_STR-SPECNOLIM sy-vline 
WA_MCESUH_STR-ACTSPLIM sy-vline 
WA_MCESUH_STR-MWSKZ sy-vline 
WA_MCESUH_STR-TXJCD sy-vline 
WA_MCESUH_STR-NAVNW sy-vline 
WA_MCESUH_STR-KSTAR sy-vline 
WA_MCESUH_STR-EBELN sy-vline 
WA_MCESUH_STR-EBELP sy-vline 
WA_MCESUH_STR-SUMNOLIMIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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