ABAP Select data from SAP table BAMSTATEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAMSTATEM
*  INTO TABLE @DATA(IT_BAMSTATEM2).
*--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_BAMSTATEM INDEX 1 INTO DATA(WA_BAMSTATEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAMSTATEM>-MAINPROG = 1.
<BAMSTATEM>-ID = 1.
<BAMSTATEM>-NAME = 1.
<BAMSTATEM>-PARENT = 1.
<BAMSTATEM>-PARAMETER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAMSTATEM-MODIFIED, sy-vline,
  WA_BAMSTATEM-PROGRAM, sy-vline,
  WA_BAMSTATEM-ROW, sy-vline,
  WA_BAMSTATEM-LEVEL, sy-vline,
  WA_BAMSTATEM-COLOR, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_BAMSTATEM 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_BAMSTATEM 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_BAMSTATEM INTO WA_BAMSTATEM.


*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_BAMSTATEM_STR, 
MAINPROG TYPE STRING,
ID TYPE STRING,
NAME TYPE STRING,
PARENT TYPE STRING,
PARAMETER TYPE STRING,
MODIFIED TYPE STRING,
PROGRAM TYPE STRING,
ROW TYPE STRING,
LEVEL TYPE STRING,
COLOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAMSTATEM_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_BAMSTATEM_STR-MAINPROG sy-vline 
WA_BAMSTATEM_STR-ID sy-vline 
WA_BAMSTATEM_STR-NAME sy-vline 
WA_BAMSTATEM_STR-PARENT sy-vline 
WA_BAMSTATEM_STR-PARAMETER sy-vline 
WA_BAMSTATEM_STR-MODIFIED sy-vline 
WA_BAMSTATEM_STR-PROGRAM sy-vline 
WA_BAMSTATEM_STR-ROW sy-vline 
WA_BAMSTATEM_STR-LEVEL sy-vline 
WA_BAMSTATEM_STR-COLOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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