ABAP Select data from SAP table MYMLM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MYMLM
*  INTO TABLE @DATA(IT_MYMLM2).
*--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_MYMLM INDEX 1 INTO DATA(WA_MYMLM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MYMLM>-MANDT = 1.
<MYMLM>-MYVER = 1.
<MYMLM>-MYKEY = 1.
<MYMLM>-MATNR = 1.
<MYMLM>-GJAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MYMLM-MYPER, sy-vline,
  WA_MYMLM-MYWRT, sy-vline,
  WA_MYMLM-MYWRN, sy-vline,
  WA_MYMLM-MYMNG, sy-vline,
  WA_MYMLM-MEINS, sy-vline,
  WA_MYMLM-PEINH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MYMLM 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_MYMLM 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_MYMLM INTO WA_MYMLM.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MYMLM-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MYMLM-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MYMLM-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MYMLM-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MYMLM-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MYMLM-MEINS.
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_MYMLM_STR, 
MANDT TYPE STRING,
MYVER TYPE STRING,
MYKEY TYPE STRING,
MATNR TYPE STRING,
GJAHR TYPE STRING,
MYPER TYPE STRING,
MYWRT TYPE STRING,
MYWRN TYPE STRING,
MYMNG TYPE STRING,
MEINS TYPE STRING,
PEINH TYPE STRING,
PRS01 TYPE STRING,
PRS02 TYPE STRING,
PRS03 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MYMLM_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_MYMLM_STR-MANDT sy-vline 
WA_MYMLM_STR-MYVER sy-vline 
WA_MYMLM_STR-MYKEY sy-vline 
WA_MYMLM_STR-MATNR sy-vline 
WA_MYMLM_STR-GJAHR sy-vline 
WA_MYMLM_STR-MYPER sy-vline 
WA_MYMLM_STR-MYWRT sy-vline 
WA_MYMLM_STR-MYWRN sy-vline 
WA_MYMLM_STR-MYMNG sy-vline 
WA_MYMLM_STR-MEINS sy-vline 
WA_MYMLM_STR-PEINH sy-vline 
WA_MYMLM_STR-PRS01 sy-vline 
WA_MYMLM_STR-PRS02 sy-vline 
WA_MYMLM_STR-PRS03 sy-vline      INTO ld_text SEPARATED BY SPACE.

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