ABAP Select data from SAP table LWM_S_CFS_ALINK_CONTENT_MD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LWM_S_CFS_ALINK_CONTENT_MD
*  INTO TABLE @DATA(IT_LWM_S_CFS_ALINK_CONTENT_MD2).
*--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_LWM_S_CFS_ALINK_CONTENT_MD INDEX 1 INTO DATA(WA_LWM_S_CFS_ALINK_CONTENT_MD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LWM_S_CFS_ALINK_CONTENT_MD>-CUSTOMER = 1.
<LWM_S_CFS_ALINK_CONTENT_MD>-COMP_CODE = 1.
<LWM_S_CFS_ALINK_CONTENT_MD>-DOCID = 1.
<LWM_S_CFS_ALINK_CONTENT_MD>-CREPID = 1.
<LWM_S_CFS_ALINK_CONTENT_MD>-CREPVER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LWM_S_CFS_ALINK_CONTENT_MD-OTYPE, sy-vline,
  WA_LWM_S_CFS_ALINK_CONTENT_MD-OID, sy-vline,
  WA_LWM_S_CFS_ALINK_CONTENT_MD-DTYPE, sy-vline,
  WA_LWM_S_CFS_ALINK_CONTENT_MD-DDESC, sy-vline,
  WA_LWM_S_CFS_ALINK_CONTENT_MD-DOCCLASS, sy-vline,
  WA_LWM_S_CFS_ALINK_CONTENT_MD-MIMETYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LWM_S_CFS_ALINK_CONTENT_MD 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_LWM_S_CFS_ALINK_CONTENT_MD 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_LWM_S_CFS_ALINK_CONTENT_MD INTO WA_LWM_S_CFS_ALINK_CONTENT_MD.


*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 ALPHA, internal->external for field CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LWM_S_CFS_ALINK_CONTENT_MD-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LWM_S_CFS_ALINK_CONTENT_MD-CUSTOMER.
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_LWM_S_CFS_ALINK_CONTENT_MD_STR, 
CUSTOMER TYPE STRING,
COMP_CODE TYPE STRING,
DOCID TYPE STRING,
CREPID TYPE STRING,
CREPVER TYPE STRING,
OTYPE TYPE STRING,
OID TYPE STRING,
DTYPE TYPE STRING,
DDESC TYPE STRING,
DOCCLASS TYPE STRING,
MIMETYPE TYPE STRING,
AR_DATE TYPE STRING,
COMPSIZE TYPE STRING,
CONTENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LWM_S_CFS_ALINK_CONTENT_MD_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_LWM_S_CFS_ALINK_CONTENT_MD_STR-CUSTOMER sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-COMP_CODE sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-DOCID sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-CREPID sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-CREPVER sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-OTYPE sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-OID sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-DTYPE sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-DDESC sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-DOCCLASS sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-MIMETYPE sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-AR_DATE sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-COMPSIZE sy-vline 
WA_LWM_S_CFS_ALINK_CONTENT_MD_STR-CONTENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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