ABAP Select data from SAP table SMLAY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SMLAY
*  INTO TABLE @DATA(IT_SMLAY2).
*--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_SMLAY INDEX 1 INTO DATA(WA_SMLAY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SMLAY>-MANDT = 1.
<SMLAY>-MYREC = 1.
<SMLAY>-MYFID = 1.
<SMLAY>-MYHIST = 1.
<SMLAY>-MYVER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SMLAY-MYKEY, sy-vline,
  WA_SMLAY-MATNR, sy-vline,
  WA_SMLAY-MYPOOL, sy-vline,
  WA_SMLAY-GJAHR, sy-vline,
  WA_SMLAY-MYPER, sy-vline,
  WA_SMLAY-MYWRT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SMLAY 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_SMLAY 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_SMLAY INTO WA_SMLAY.


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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_SMLAY-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_SMLAY-AUFNR.
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_SMLAY_STR, 
MANDT TYPE STRING,
MYREC TYPE STRING,
MYFID TYPE STRING,
MYHIST TYPE STRING,
MYVER TYPE STRING,
MYKEY TYPE STRING,
MATNR TYPE STRING,
MYPOOL 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,
MYPIX TYPE STRING,
MYBAS TYPE STRING,
MYZMNG TYPE STRING,
MYZWRT TYPE STRING,
DATLO TYPE STRING,
METHOD TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
MBLPO TYPE STRING,
BWTAR TYPE STRING,
BWART TYPE STRING,
LIFNR TYPE STRING,
AUFNR TYPE STRING,
FBASE TYPE STRING,
POOLIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SMLAY_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_SMLAY_STR-MANDT sy-vline 
WA_SMLAY_STR-MYREC sy-vline 
WA_SMLAY_STR-MYFID sy-vline 
WA_SMLAY_STR-MYHIST sy-vline 
WA_SMLAY_STR-MYVER sy-vline 
WA_SMLAY_STR-MYKEY sy-vline 
WA_SMLAY_STR-MATNR sy-vline 
WA_SMLAY_STR-MYPOOL sy-vline 
WA_SMLAY_STR-GJAHR sy-vline 
WA_SMLAY_STR-MYPER sy-vline 
WA_SMLAY_STR-MYWRT sy-vline 
WA_SMLAY_STR-MYWRN sy-vline 
WA_SMLAY_STR-MYMNG sy-vline 
WA_SMLAY_STR-MEINS sy-vline 
WA_SMLAY_STR-PEINH sy-vline 
WA_SMLAY_STR-PRS01 sy-vline 
WA_SMLAY_STR-PRS02 sy-vline 
WA_SMLAY_STR-PRS03 sy-vline 
WA_SMLAY_STR-MYPIX sy-vline 
WA_SMLAY_STR-MYBAS sy-vline 
WA_SMLAY_STR-MYZMNG sy-vline 
WA_SMLAY_STR-MYZWRT sy-vline 
WA_SMLAY_STR-DATLO sy-vline 
WA_SMLAY_STR-METHOD sy-vline 
WA_SMLAY_STR-EBELN sy-vline 
WA_SMLAY_STR-EBELP sy-vline 
WA_SMLAY_STR-MBLNR sy-vline 
WA_SMLAY_STR-MJAHR sy-vline 
WA_SMLAY_STR-MBLPO sy-vline 
WA_SMLAY_STR-BWTAR sy-vline 
WA_SMLAY_STR-BWART sy-vline 
WA_SMLAY_STR-LIFNR sy-vline 
WA_SMLAY_STR-AUFNR sy-vline 
WA_SMLAY_STR-FBASE sy-vline 
WA_SMLAY_STR-POOLIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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