ABAP Select data from SAP table MEMMODETAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEMMODETAB
*  INTO TABLE @DATA(IT_MEMMODETAB2).
*--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_MEMMODETAB INDEX 1 INTO DATA(WA_MEMMODETAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEMMODETAB>-ROLLKEY = 1.
<MEMMODETAB>-NAME = 1.
<MEMMODETAB>-ATTACHED = 1.
<MEMMODETAB>-IMODE = 1.
<MEMMODETAB>-MEMSUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEMMODETAB-PRIVSUM, sy-vline,
  WA_MEMMODETAB-I0, sy-vline,
  WA_MEMMODETAB-I1, sy-vline,
  WA_MEMMODETAB-I2, sy-vline,
  WA_MEMMODETAB-I3, sy-vline,
  WA_MEMMODETAB-I4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEMMODETAB 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_MEMMODETAB 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_MEMMODETAB INTO WA_MEMMODETAB.


*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_MEMMODETAB_STR, 
ROLLKEY TYPE STRING,
NAME TYPE STRING,
ATTACHED TYPE STRING,
IMODE TYPE STRING,
MEMSUM TYPE STRING,
PRIVSUM TYPE STRING,
I0 TYPE STRING,
I1 TYPE STRING,
I2 TYPE STRING,
I3 TYPE STRING,
I4 TYPE STRING,
I5 TYPE STRING,
I6 TYPE STRING,
I7 TYPE STRING,
I8 TYPE STRING,
I9 TYPE STRING,
IMODEG TYPE STRING,
EMODEG TYPE STRING,
HARDLIMIT_EXT_DIA TYPE STRING,
HARDLIMIT_EXT_NONDIA TYPE STRING,
HARDLIMIT_DIA TYPE STRING,
HARDLIMIT_NONDIA TYPE STRING,
WPNO TYPE STRING,
RESERVE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEMMODETAB_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_MEMMODETAB_STR-ROLLKEY sy-vline 
WA_MEMMODETAB_STR-NAME sy-vline 
WA_MEMMODETAB_STR-ATTACHED sy-vline 
WA_MEMMODETAB_STR-IMODE sy-vline 
WA_MEMMODETAB_STR-MEMSUM sy-vline 
WA_MEMMODETAB_STR-PRIVSUM sy-vline 
WA_MEMMODETAB_STR-I0 sy-vline 
WA_MEMMODETAB_STR-I1 sy-vline 
WA_MEMMODETAB_STR-I2 sy-vline 
WA_MEMMODETAB_STR-I3 sy-vline 
WA_MEMMODETAB_STR-I4 sy-vline 
WA_MEMMODETAB_STR-I5 sy-vline 
WA_MEMMODETAB_STR-I6 sy-vline 
WA_MEMMODETAB_STR-I7 sy-vline 
WA_MEMMODETAB_STR-I8 sy-vline 
WA_MEMMODETAB_STR-I9 sy-vline 
WA_MEMMODETAB_STR-IMODEG sy-vline 
WA_MEMMODETAB_STR-EMODEG sy-vline 
WA_MEMMODETAB_STR-HARDLIMIT_EXT_DIA sy-vline 
WA_MEMMODETAB_STR-HARDLIMIT_EXT_NONDIA sy-vline 
WA_MEMMODETAB_STR-HARDLIMIT_DIA sy-vline 
WA_MEMMODETAB_STR-HARDLIMIT_NONDIA sy-vline 
WA_MEMMODETAB_STR-WPNO sy-vline 
WA_MEMMODETAB_STR-RESERVE sy-vline      INTO ld_text SEPARATED BY SPACE.

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