ABAP Select data from SAP table ASL_DE_PARAM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ASL_DE_PARAM
*  INTO TABLE @DATA(IT_ASL_DE_PARAM2).
*--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_ASL_DE_PARAM INDEX 1 INTO DATA(WA_ASL_DE_PARAM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ASL_DE_PARAM>-ZLNR = 1.
<ASL_DE_PARAM>-UNAME = 1.
<ASL_DE_PARAM>-UART = 1.
<ASL_DE_PARAM>-USTRAS = 1.
<ASL_DE_PARAM>-UHAUSN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ASL_DE_PARAM-UPSTLZ, sy-vline,
  WA_ASL_DE_PARAM-UORT, sy-vline,
  WA_ASL_DE_PARAM-UTLFNR, sy-vline,
  WA_ASL_DE_PARAM-UEMAIL, sy-vline,
  WA_ASL_DE_PARAM-CORR, sy-vline,
  WA_ASL_DE_PARAM-HNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ASL_DE_PARAM 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_ASL_DE_PARAM 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_ASL_DE_PARAM INTO WA_ASL_DE_PARAM.


*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_ASL_DE_PARAM_STR, 
ZLNR TYPE STRING,
UNAME TYPE STRING,
UART TYPE STRING,
USTRAS TYPE STRING,
UHAUSN TYPE STRING,
UPSTLZ TYPE STRING,
UORT TYPE STRING,
UTLFNR TYPE STRING,
UEMAIL TYPE STRING,
CORR TYPE STRING,
HNAME TYPE STRING,
HART TYPE STRING,
HSTRAS TYPE STRING,
HHAUSN TYPE STRING,
HPSTLZ TYPE STRING,
HORT TYPE STRING,
HTLFNR TYPE STRING,
HEMAIL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ASL_DE_PARAM_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_ASL_DE_PARAM_STR-ZLNR sy-vline 
WA_ASL_DE_PARAM_STR-UNAME sy-vline 
WA_ASL_DE_PARAM_STR-UART sy-vline 
WA_ASL_DE_PARAM_STR-USTRAS sy-vline 
WA_ASL_DE_PARAM_STR-UHAUSN sy-vline 
WA_ASL_DE_PARAM_STR-UPSTLZ sy-vline 
WA_ASL_DE_PARAM_STR-UORT sy-vline 
WA_ASL_DE_PARAM_STR-UTLFNR sy-vline 
WA_ASL_DE_PARAM_STR-UEMAIL sy-vline 
WA_ASL_DE_PARAM_STR-CORR sy-vline 
WA_ASL_DE_PARAM_STR-HNAME sy-vline 
WA_ASL_DE_PARAM_STR-HART sy-vline 
WA_ASL_DE_PARAM_STR-HSTRAS sy-vline 
WA_ASL_DE_PARAM_STR-HHAUSN sy-vline 
WA_ASL_DE_PARAM_STR-HPSTLZ sy-vline 
WA_ASL_DE_PARAM_STR-HORT sy-vline 
WA_ASL_DE_PARAM_STR-HTLFNR sy-vline 
WA_ASL_DE_PARAM_STR-HEMAIL sy-vline      INTO ld_text SEPARATED BY SPACE.

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