ABAP Select data from SAP table HR99S_MMT_BUFFER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP HR99S_MMT_BUFFER 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 HR99S_MMT_BUFFER. 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 HR99S_MMT_BUFFER 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_HR99S_MMT_BUFFER TYPE STANDARD TABLE OF HR99S_MMT_BUFFER,
      WA_HR99S_MMT_BUFFER TYPE HR99S_MMT_BUFFER,
      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: <HR99S_MMT_BUFFER> TYPE HR99S_MMT_BUFFER.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_HR99S_MMT_BUFFER.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM HR99S_MMT_BUFFER
  INTO TABLE IT_HR99S_MMT_BUFFER.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HR99S_MMT_BUFFER
*  INTO TABLE @DATA(IT_HR99S_MMT_BUFFER2).
*--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_HR99S_MMT_BUFFER INDEX 1 INTO DATA(WA_HR99S_MMT_BUFFER2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_HR99S_MMT_BUFFER ASSIGNING <HR99S_MMT_BUFFER>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HR99S_MMT_BUFFER>-IS_MSG_KEY = 1.
<HR99S_MMT_BUFFER>-MOLGA = 1.
<HR99S_MMT_BUFFER>-MSGTY = 1.
<HR99S_MMT_BUFFER>-MSGID = 1.
<HR99S_MMT_BUFFER>-MSGNO = 1.

ENDLOOP.

LOOP AT IT_HR99S_MMT_BUFFER INTO WA_HR99S_MMT_BUFFER.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HR99S_MMT_BUFFER-BATCH, sy-vline,
  WA_HR99S_MMT_BUFFER-AGENT, sy-vline,
  WA_HR99S_MMT_BUFFER-CCCAT, sy-vline,
  WA_HR99S_MMT_BUFFER-TRCNT, sy-vline,
  WA_HR99S_MMT_BUFFER-GRPID, sy-vline,
  WA_HR99S_MMT_BUFFER-UNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_HR99S_MMT_BUFFER 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_HR99S_MMT_BUFFER 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_HR99S_MMT_BUFFER INTO WA_HR99S_MMT_BUFFER.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_HR99S_MMT_BUFFER_STR, 
IS_MSG_KEY TYPE STRING,
MOLGA TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
BATCH TYPE STRING,
AGENT TYPE STRING,
CCCAT TYPE STRING,
TRCNT TYPE STRING,
GRPID TYPE STRING,
UNAME TYPE STRING,
PERNR TYPE STRING,
APPL TYPE STRING,
IS_ORG_MSG TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
ES_ALT_MSG TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
EV_HIDE_MESSAGE TYPE STRING,
ES_MAPPING_RULE TYPE STRING,
MANDT TYPE STRING,
MOLGA TYPE STRING,
APPL TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
BATCH TYPE STRING,
AGENT TYPE STRING,
CCCAT TYPE STRING,
TRCNT TYPE STRING,
GRPID TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
HDMSG TYPE STRING,
AMGTY TYPE STRING,
AMGID TYPE STRING,
AMGNO TYPE STRING,
MMACT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HR99S_MMT_BUFFER_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_HR99S_MMT_BUFFER_STR-IS_MSG_KEY sy-vline 
WA_HR99S_MMT_BUFFER_STR-MOLGA sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGTY sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGID sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGNO sy-vline 
WA_HR99S_MMT_BUFFER_STR-BATCH sy-vline 
WA_HR99S_MMT_BUFFER_STR-AGENT sy-vline 
WA_HR99S_MMT_BUFFER_STR-CCCAT sy-vline 
WA_HR99S_MMT_BUFFER_STR-TRCNT sy-vline 
WA_HR99S_MMT_BUFFER_STR-GRPID sy-vline 
WA_HR99S_MMT_BUFFER_STR-UNAME sy-vline 
WA_HR99S_MMT_BUFFER_STR-PERNR sy-vline 
WA_HR99S_MMT_BUFFER_STR-APPL sy-vline 
WA_HR99S_MMT_BUFFER_STR-IS_ORG_MSG sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGTY sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGID sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGNO sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV1 sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV2 sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV3 sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV4 sy-vline 
WA_HR99S_MMT_BUFFER_STR-ES_ALT_MSG sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGTY sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGID sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGNO sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV1 sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV2 sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV3 sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGV4 sy-vline 
WA_HR99S_MMT_BUFFER_STR-EV_HIDE_MESSAGE sy-vline 
WA_HR99S_MMT_BUFFER_STR-ES_MAPPING_RULE sy-vline 
WA_HR99S_MMT_BUFFER_STR-MANDT sy-vline 
WA_HR99S_MMT_BUFFER_STR-MOLGA sy-vline 
WA_HR99S_MMT_BUFFER_STR-APPL sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGTY sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGID sy-vline 
WA_HR99S_MMT_BUFFER_STR-MSGNO sy-vline 
WA_HR99S_MMT_BUFFER_STR-BATCH sy-vline 
WA_HR99S_MMT_BUFFER_STR-AGENT sy-vline 
WA_HR99S_MMT_BUFFER_STR-CCCAT sy-vline 
WA_HR99S_MMT_BUFFER_STR-TRCNT sy-vline 
WA_HR99S_MMT_BUFFER_STR-GRPID sy-vline 
WA_HR99S_MMT_BUFFER_STR-ENDDA sy-vline 
WA_HR99S_MMT_BUFFER_STR-BEGDA sy-vline 
WA_HR99S_MMT_BUFFER_STR-HDMSG sy-vline 
WA_HR99S_MMT_BUFFER_STR-AMGTY sy-vline 
WA_HR99S_MMT_BUFFER_STR-AMGID sy-vline 
WA_HR99S_MMT_BUFFER_STR-AMGNO sy-vline 
WA_HR99S_MMT_BUFFER_STR-MMACT sy-vline      INTO ld_text SEPARATED BY SPACE.

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