ABAP Select data from SAP table MDG_BS_BP_S_EI_CLASS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDG_BS_BP_S_EI_CLASS
*  INTO TABLE @DATA(IT_MDG_BS_BP_S_EI_CLASS2).
*--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_MDG_BS_BP_S_EI_CLASS INDEX 1 INTO DATA(WA_MDG_BS_BP_S_EI_CLASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDG_BS_BP_S_EI_CLASS>-TASK = 1.
<MDG_BS_BP_S_EI_CLASS>-DATA_KEY = 1.
<MDG_BS_BP_S_EI_CLASS>-OBJTYPE = 1.
<MDG_BS_BP_S_EI_CLASS>-OBJNUM = 1.
<MDG_BS_BP_S_EI_CLASS>-CLASSTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDG_BS_BP_S_EI_CLASS-CLASS, sy-vline,
  WA_MDG_BS_BP_S_EI_CLASS-DATA, sy-vline,
  WA_MDG_BS_BP_S_EI_CLASS-CLINT, sy-vline,
  WA_MDG_BS_BP_S_EI_CLASS-CLSTATUS, sy-vline,
  WA_MDG_BS_BP_S_EI_CLASS-DATAX, sy-vline,
  WA_MDG_BS_BP_S_EI_CLASS-CLINT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDG_BS_BP_S_EI_CLASS 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_MDG_BS_BP_S_EI_CLASS 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_MDG_BS_BP_S_EI_CLASS INTO WA_MDG_BS_BP_S_EI_CLASS.


*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_MDG_BS_BP_S_EI_CLASS_STR, 
TASK TYPE STRING,
DATA_KEY TYPE STRING,
OBJTYPE TYPE STRING,
OBJNUM TYPE STRING,
CLASSTYPE TYPE STRING,
CLASS TYPE STRING,
DATA TYPE STRING,
CLINT TYPE STRING,
CLSTATUS TYPE STRING,
DATAX TYPE STRING,
CLINT TYPE STRING,
CLSTATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDG_BS_BP_S_EI_CLASS_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_MDG_BS_BP_S_EI_CLASS_STR-TASK sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-DATA_KEY sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-OBJTYPE sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-OBJNUM sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-CLASSTYPE sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-CLASS sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-DATA sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-CLINT sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-CLSTATUS sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-DATAX sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-CLINT sy-vline 
WA_MDG_BS_BP_S_EI_CLASS_STR-CLSTATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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