ABAP Select data from SAP table BMMH2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BMMH2 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 BMMH2. 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 BMMH2 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_BMMH2 TYPE STANDARD TABLE OF BMMH2,
      WA_BMMH2 TYPE BMMH2,
      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: <BMMH2> TYPE BMMH2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BMMH2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BMMH2
  INTO TABLE IT_BMMH2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BMMH2
*  INTO TABLE @DATA(IT_BMMH22).
*--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_BMMH2 INDEX 1 INTO DATA(WA_BMMH22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BMMH2 ASSIGNING <BMMH2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BMMH2>-STYPE = 1.
<BMMH2>-ALAND = 1.
<BMMH2>-TATY1 = 1.
<BMMH2>-TAXM1 = 1.
<BMMH2>-TATY2 = 1.

ENDLOOP.

LOOP AT IT_BMMH2 INTO WA_BMMH2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BMMH2-TAXM2, sy-vline,
  WA_BMMH2-TATY3, sy-vline,
  WA_BMMH2-TAXM3, sy-vline,
  WA_BMMH2-TATY4, sy-vline,
  WA_BMMH2-TAXM4, sy-vline,
  WA_BMMH2-TATY5, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BMMH2 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_BMMH2 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_BMMH2 INTO WA_BMMH2.


*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_BMMH2_STR, 
STYPE TYPE STRING,
ALAND TYPE STRING,
TATY1 TYPE STRING,
TAXM1 TYPE STRING,
TATY2 TYPE STRING,
TAXM2 TYPE STRING,
TATY3 TYPE STRING,
TAXM3 TYPE STRING,
TATY4 TYPE STRING,
TAXM4 TYPE STRING,
TATY5 TYPE STRING,
TAXM5 TYPE STRING,
TATY6 TYPE STRING,
TAXM6 TYPE STRING,
TATY7 TYPE STRING,
TAXM7 TYPE STRING,
TATY8 TYPE STRING,
TAXM8 TYPE STRING,
TATY9 TYPE STRING,
TAXM9 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BMMH2_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_BMMH2_STR-STYPE sy-vline 
WA_BMMH2_STR-ALAND sy-vline 
WA_BMMH2_STR-TATY1 sy-vline 
WA_BMMH2_STR-TAXM1 sy-vline 
WA_BMMH2_STR-TATY2 sy-vline 
WA_BMMH2_STR-TAXM2 sy-vline 
WA_BMMH2_STR-TATY3 sy-vline 
WA_BMMH2_STR-TAXM3 sy-vline 
WA_BMMH2_STR-TATY4 sy-vline 
WA_BMMH2_STR-TAXM4 sy-vline 
WA_BMMH2_STR-TATY5 sy-vline 
WA_BMMH2_STR-TAXM5 sy-vline 
WA_BMMH2_STR-TATY6 sy-vline 
WA_BMMH2_STR-TAXM6 sy-vline 
WA_BMMH2_STR-TATY7 sy-vline 
WA_BMMH2_STR-TAXM7 sy-vline 
WA_BMMH2_STR-TATY8 sy-vline 
WA_BMMH2_STR-TAXM8 sy-vline 
WA_BMMH2_STR-TATY9 sy-vline 
WA_BMMH2_STR-TAXM9 sy-vline      INTO ld_text SEPARATED BY SPACE.

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