ABAP Select data from SAP table PAMS_S_MESSBELEG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PAMS_S_MESSBELEG
*  INTO TABLE @DATA(IT_PAMS_S_MESSBELEG2).
*--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_PAMS_S_MESSBELEG INDEX 1 INTO DATA(WA_PAMS_S_MESSBELEG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PAMS_S_MESSBELEG>-MLANG = 1.
<PAMS_S_MESSBELEG>-WOOBJ = 1.
<PAMS_S_MESSBELEG>-MDOCM = 1.
<PAMS_S_MESSBELEG>-POINT = 1.
<PAMS_S_MESSBELEG>-PSORT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PAMS_S_MESSBELEG-IDATE, sy-vline,
  WA_PAMS_S_MESSBELEG-ITIME, sy-vline,
  WA_PAMS_S_MESSBELEG-RECDV, sy-vline,
  WA_PAMS_S_MESSBELEG-RECDVI, sy-vline,
  WA_PAMS_S_MESSBELEG-MDTXT, sy-vline,
  WA_PAMS_S_MESSBELEG-READR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PAMS_S_MESSBELEG 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_PAMS_S_MESSBELEG 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_PAMS_S_MESSBELEG INTO WA_PAMS_S_MESSBELEG.


*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 ISOLA, internal->external for field MLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_PAMS_S_MESSBELEG-MLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PAMS_S_MESSBELEG-MLANG.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field POINT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PAMS_S_MESSBELEG-POINT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PAMS_S_MESSBELEG-POINT.
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_PAMS_S_MESSBELEG_STR, 
MLANG TYPE STRING,
WOOBJ TYPE STRING,
MDOCM TYPE STRING,
POINT TYPE STRING,
PSORT TYPE STRING,
IDATE TYPE STRING,
ITIME TYPE STRING,
RECDV TYPE STRING,
RECDVI TYPE STRING,
MDTXT TYPE STRING,
READR TYPE STRING,
IDATE_OLD TYPE STRING,
ITIME_OLD TYPE STRING,
RECDV_OLD TYPE STRING,
LABELTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PAMS_S_MESSBELEG_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_PAMS_S_MESSBELEG_STR-MLANG sy-vline 
WA_PAMS_S_MESSBELEG_STR-WOOBJ sy-vline 
WA_PAMS_S_MESSBELEG_STR-MDOCM sy-vline 
WA_PAMS_S_MESSBELEG_STR-POINT sy-vline 
WA_PAMS_S_MESSBELEG_STR-PSORT sy-vline 
WA_PAMS_S_MESSBELEG_STR-IDATE sy-vline 
WA_PAMS_S_MESSBELEG_STR-ITIME sy-vline 
WA_PAMS_S_MESSBELEG_STR-RECDV sy-vline 
WA_PAMS_S_MESSBELEG_STR-RECDVI sy-vline 
WA_PAMS_S_MESSBELEG_STR-MDTXT sy-vline 
WA_PAMS_S_MESSBELEG_STR-READR sy-vline 
WA_PAMS_S_MESSBELEG_STR-IDATE_OLD sy-vline 
WA_PAMS_S_MESSBELEG_STR-ITIME_OLD sy-vline 
WA_PAMS_S_MESSBELEG_STR-RECDV_OLD sy-vline 
WA_PAMS_S_MESSBELEG_STR-LABELTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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