ABAP Select data from SAP table MMSRV_MSS_HEADER_STY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMSRV_MSS_HEADER_STY
*  INTO TABLE @DATA(IT_MMSRV_MSS_HEADER_STY2).
*--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_MMSRV_MSS_HEADER_STY INDEX 1 INTO DATA(WA_MMSRV_MSS_HEADER_STY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMSRV_MSS_HEADER_STY>-MSS_NUM = 1.
<MMSRV_MSS_HEADER_STY>-SHORT_TEXT = 1.
<MMSRV_MSS_HEADER_STY>-VENDOR = 1.
<MMSRV_MSS_HEADER_STY>-SERV_CAT = 1.
<MMSRV_MSS_HEADER_STY>-CURR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMSRV_MSS_HEADER_STY-MAT_GRP, sy-vline,
  WA_MMSRV_MSS_HEADER_STY-PUR_ORG, sy-vline,
  WA_MMSRV_MSS_HEADER_STY-CONTRACT, sy-vline,
  WA_MMSRV_MSS_HEADER_STY-VALID_FRM, sy-vline,
  WA_MMSRV_MSS_HEADER_STY-CRTD_ON, sy-vline,
  WA_MMSRV_MSS_HEADER_STY-CRTD_BY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMSRV_MSS_HEADER_STY 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_MMSRV_MSS_HEADER_STY 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_MMSRV_MSS_HEADER_STY INTO WA_MMSRV_MSS_HEADER_STY.


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

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

*Conversion exit ALPHA, internal->external for field CONTRACT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMSRV_MSS_HEADER_STY-CONTRACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMSRV_MSS_HEADER_STY-CONTRACT.
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_MMSRV_MSS_HEADER_STY_STR, 
MSS_NUM TYPE STRING,
SHORT_TEXT TYPE STRING,
VENDOR TYPE STRING,
SERV_CAT TYPE STRING,
CURR TYPE STRING,
MAT_GRP TYPE STRING,
PUR_ORG TYPE STRING,
CONTRACT TYPE STRING,
VALID_FRM TYPE STRING,
CRTD_ON TYPE STRING,
CRTD_BY TYPE STRING,
DEL TYPE STRING,
BLOCK TYPE STRING,
USE_KONF TYPE STRING,
WAERS TYPE STRING,
NETWR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMSRV_MSS_HEADER_STY_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_MMSRV_MSS_HEADER_STY_STR-MSS_NUM sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-SHORT_TEXT sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-VENDOR sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-SERV_CAT sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-CURR sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-MAT_GRP sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-PUR_ORG sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-CONTRACT sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-VALID_FRM sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-CRTD_ON sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-CRTD_BY sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-DEL sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-BLOCK sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-USE_KONF sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-WAERS sy-vline 
WA_MMSRV_MSS_HEADER_STY_STR-NETWR sy-vline      INTO ld_text SEPARATED BY SPACE.

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