ABAP Select data from SAP table BMA_WLST_C into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BMA_WLST_C
*  INTO TABLE @DATA(IT_BMA_WLST_C2).
*--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_BMA_WLST_C INDEX 1 INTO DATA(WA_BMA_WLST_C2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BMA_WLST_C>-LFDNR = 1.
<BMA_WLST_C>-PGMID = 1.
<BMA_WLST_C>-OBJECT = 1.
<BMA_WLST_C>-OBJ_NAME = 1.
<BMA_WLST_C>-PROG_NAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BMA_WLST_C-LINE, sy-vline,
  WA_BMA_WLST_C-FUNCNAME, sy-vline,
  WA_BMA_WLST_C-PARAM, sy-vline,
  WA_BMA_WLST_C-PARAMTYPE, sy-vline,
  WA_BMA_WLST_C-DYNNUMB, sy-vline,
  WA_BMA_WLST_C-DDOBJNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BMA_WLST_C 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_BMA_WLST_C 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_BMA_WLST_C INTO WA_BMA_WLST_C.


*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_BMA_WLST_C_STR, 
LFDNR TYPE STRING,
PGMID TYPE STRING,
OBJECT TYPE STRING,
OBJ_NAME TYPE STRING,
PROG_NAME TYPE STRING,
LINE TYPE STRING,
FUNCNAME TYPE STRING,
PARAM TYPE STRING,
PARAMTYPE TYPE STRING,
DYNNUMB TYPE STRING,
DDOBJNAME TYPE STRING,
OBJTYPE TYPE STRING,
SRCSYSTEM TYPE STRING,
COMPONENT TYPE STRING,
AUTHOR TYPE STRING,
DEVCLASS TYPE STRING,
CLASSIF TYPE STRING,
TEXT TYPE STRING,
STATUS TYPE STRING,
NODE TYPE STRING,
REF_LFDNR TYPE STRING,
UPDKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BMA_WLST_C_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_BMA_WLST_C_STR-LFDNR sy-vline 
WA_BMA_WLST_C_STR-PGMID sy-vline 
WA_BMA_WLST_C_STR-OBJECT sy-vline 
WA_BMA_WLST_C_STR-OBJ_NAME sy-vline 
WA_BMA_WLST_C_STR-PROG_NAME sy-vline 
WA_BMA_WLST_C_STR-LINE sy-vline 
WA_BMA_WLST_C_STR-FUNCNAME sy-vline 
WA_BMA_WLST_C_STR-PARAM sy-vline 
WA_BMA_WLST_C_STR-PARAMTYPE sy-vline 
WA_BMA_WLST_C_STR-DYNNUMB sy-vline 
WA_BMA_WLST_C_STR-DDOBJNAME sy-vline 
WA_BMA_WLST_C_STR-OBJTYPE sy-vline 
WA_BMA_WLST_C_STR-SRCSYSTEM sy-vline 
WA_BMA_WLST_C_STR-COMPONENT sy-vline 
WA_BMA_WLST_C_STR-AUTHOR sy-vline 
WA_BMA_WLST_C_STR-DEVCLASS sy-vline 
WA_BMA_WLST_C_STR-CLASSIF sy-vline 
WA_BMA_WLST_C_STR-TEXT sy-vline 
WA_BMA_WLST_C_STR-STATUS sy-vline 
WA_BMA_WLST_C_STR-NODE sy-vline 
WA_BMA_WLST_C_STR-REF_LFDNR sy-vline 
WA_BMA_WLST_C_STR-UPDKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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