ABAP Select data from SAP table J_7LMS_V1P_MEKEY into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_7LMS_V1P_MEKEY 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 J_7LMS_V1P_MEKEY. 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 J_7LMS_V1P_MEKEY 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_J_7LMS_V1P_MEKEY TYPE STANDARD TABLE OF J_7LMS_V1P_MEKEY,
      WA_J_7LMS_V1P_MEKEY TYPE J_7LMS_V1P_MEKEY,
      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: <J_7LMS_V1P_MEKEY> TYPE J_7LMS_V1P_MEKEY.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_7LMS_V1P_MEKEY.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_7LMS_V1P_MEKEY
  INTO TABLE IT_J_7LMS_V1P_MEKEY.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_7LMS_V1P_MEKEY
*  INTO TABLE @DATA(IT_J_7LMS_V1P_MEKEY2).
*--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_J_7LMS_V1P_MEKEY INDEX 1 INTO DATA(WA_J_7LMS_V1P_MEKEY2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_7LMS_V1P_MEKEY ASSIGNING <J_7LMS_V1P_MEKEY>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_7LMS_V1P_MEKEY>-MATNR = 1.
<J_7LMS_V1P_MEKEY>-VARIANTE = 1.
<J_7LMS_V1P_MEKEY>-VRKME = 1.
<J_7LMS_V1P_MEKEY>-DATAB = 1.
<J_7LMS_V1P_MEKEY>-DATBI = 1.

ENDLOOP.

LOOP AT IT_J_7LMS_V1P_MEKEY INTO WA_J_7LMS_V1P_MEKEY.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_7LMS_V1P_MEKEY-MEKEY, sy-vline,
  WA_J_7LMS_V1P_MEKEY-SOKOA, sy-vline,
  WA_J_7LMS_V1P_MEKEY-PLTYP, sy-vline,
  WA_J_7LMS_V1P_MEKEY-POSAR, sy-vline,
  WA_J_7LMS_V1P_MEKEY-STOFE, sy-vline,
  WA_J_7LMS_V1P_MEKEY-STGEW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_7LMS_V1P_MEKEY 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_J_7LMS_V1P_MEKEY 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_J_7LMS_V1P_MEKEY INTO WA_J_7LMS_V1P_MEKEY.


*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_J_7LMS_V1P_MEKEY-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_7LMS_V1P_MEKEY-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_7LMS_V1P_MEKEY-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_7LMS_V1P_MEKEY-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_7LMS_V1P_MEKEY-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_7LMS_V1P_MEKEY-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_7LMS_V1P_MEKEY-VOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_7LMS_V1P_MEKEY-VOLEH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_7LMS_V1P_MEKEY-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_7LMS_V1P_MEKEY-VBELN.
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_J_7LMS_V1P_MEKEY_STR, 
MATNR TYPE STRING,
VARIANTE TYPE STRING,
VRKME TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
MEKEY TYPE STRING,
SOKOA TYPE STRING,
PLTYP TYPE STRING,
POSAR TYPE STRING,
STOFE TYPE STRING,
STGEW TYPE STRING,
GEWEI TYPE STRING,
VPEBENE TYPE STRING,
VPARTG TYPE STRING,
VRPKT TYPE STRING,
INFOK TYPE STRING,
FUELLG TYPE STRING,
HDLST TYPE STRING,
FKIMP TYPE STRING,
M11_DATAB TYPE STRING,
M11_DATBI TYPE STRING,
NETWR TYPE STRING,
WAERK TYPE STRING,
MAKTX TYPE STRING,
UMFAC TYPE STRING,
NTGEW TYPE STRING,
VOLUM TYPE STRING,
VOLEH TYPE STRING,
VBELN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_7LMS_V1P_MEKEY_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_J_7LMS_V1P_MEKEY_STR-MATNR sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VARIANTE sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VRKME sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-DATAB sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-DATBI sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-MEKEY sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-SOKOA sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-PLTYP sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-POSAR sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-STOFE sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-STGEW sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-GEWEI sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VPEBENE sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VPARTG sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VRPKT sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-INFOK sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-FUELLG sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-HDLST sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-FKIMP sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-M11_DATAB sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-M11_DATBI sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-NETWR sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-WAERK sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-MAKTX sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-UMFAC sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-NTGEW sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VOLUM sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VOLEH sy-vline 
WA_J_7LMS_V1P_MEKEY_STR-VBELN sy-vline      INTO ld_text SEPARATED BY SPACE.

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