ABAP Select data from SAP table /1FB/MD_________001002G into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /1FB/MD_________001002G 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 /1FB/MD_________001002G. 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 /1FB/MD_________001002G 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_/1FB/MD_________001002G TYPE STANDARD TABLE OF /1FB/MD_________001002G,
      WA_/1FB/MD_________001002G TYPE /1FB/MD_________001002G,
      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: </1FB/MD_________001002G> TYPE /1FB/MD_________001002G.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/1FB/MD_________001002G.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /1FB/MD_________001002G
  INTO TABLE IT_/1FB/MD_________001002G.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /1FB/MD_________001002G
*  INTO TABLE @DATA(IT_/1FB/MD_________001002G2).
*--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_/1FB/MD_________001002G INDEX 1 INTO DATA(WA_/1FB/MD_________001002G2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/1FB/MD_________001002G ASSIGNING </1FB/MD_________001002G>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</1FB/MD_________001002G>-USMD_CREQUEST = 1.
</1FB/MD_________001002G>-USMD_ACREATED_A2 = 1.
</1FB/MD_________001002G>-USMD_ACREATED_AT = 1.
</1FB/MD_________001002G>-USMD_ACREATED_BY = 1.
</1FB/MD_________001002G>-USMD_CHANGED_AT = 1.

ENDLOOP.

LOOP AT IT_/1FB/MD_________001002G INTO WA_/1FB/MD_________001002G.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/1FB/MD_________001002G-USMD_CHANGED_BY, sy-vline,
  WA_/1FB/MD_________001002G-USMD_CONTENT, sy-vline,
  WA_/1FB/MD_________001002G-USMD_CREATED_AT, sy-vline,
  WA_/1FB/MD_________001002G-USMD_CREATED_BY, sy-vline,
  WA_/1FB/MD_________001002G-USMD_CREQ_STATUS, sy-vline,
  WA_/1FB/MD_________001002G-USMD_CREQ_TEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/1FB/MD_________001002G 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_/1FB/MD_________001002G 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_/1FB/MD_________001002G INTO WA_/1FB/MD_________001002G.


*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.

*Conversion exit ALPHA, internal->external for field USMD_CREQUEST
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/1FB/MD_________001002G-USMD_CREQUEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/1FB/MD_________001002G-USMD_CREQUEST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field USMD_EDITION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/1FB/MD_________001002G-USMD_EDITION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/1FB/MD_________001002G-USMD_EDITION.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field USMD_LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_/1FB/MD_________001002G-USMD_LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/1FB/MD_________001002G-USMD_LANGUAGE.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/1FB/MD_________001002G_STR, 
USMD_CREQUEST TYPE STRING,
USMD_ACREATED_A2 TYPE STRING,
USMD_ACREATED_AT TYPE STRING,
USMD_ACREATED_BY TYPE STRING,
USMD_CHANGED_AT TYPE STRING,
USMD_CHANGED_BY TYPE STRING,
USMD_CONTENT TYPE STRING,
USMD_CREATED_AT TYPE STRING,
USMD_CREATED_BY TYPE STRING,
USMD_CREQ_STATUS TYPE STRING,
USMD_CREQ_TEXT TYPE STRING,
USMD_CREQ_TYPE TYPE STRING,
USMD_DATA_CHN_AT TYPE STRING,
USMD_DRAFT_STEP TYPE STRING,
USMD_EDITION TYPE STRING,
USMD_ENTITY TYPE STRING,
USMD_ENTITY_OBJ TYPE STRING,
USMD_FILE_SIZE TYPE STRING,
USMD_FILE_TYPE TYPE STRING,
USMD_ISR_OBJID TYPE STRING,
USMD_LANGUAGE TYPE STRING,
USMD_NCREATED_AT TYPE STRING,
USMD_NCREATED_BY TYPE STRING,
USMD_RELEASED_AT TYPE STRING,
USMD_RELEASED_BY TYPE STRING,
USMD_SEQNR TYPE STRING,
USMD_SEQNR_NODE TYPE STRING,
USMD_TITLE TYPE STRING,
USMD_VALUE TYPE STRING,
USMD_VALUE_NODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/1FB/MD_________001002G_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_/1FB/MD_________001002G_STR-USMD_CREQUEST sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_ACREATED_A2 sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_ACREATED_AT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_ACREATED_BY sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CHANGED_AT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CHANGED_BY sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CONTENT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CREATED_AT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CREATED_BY sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CREQ_STATUS sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CREQ_TEXT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_CREQ_TYPE sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_DATA_CHN_AT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_DRAFT_STEP sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_EDITION sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_ENTITY sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_ENTITY_OBJ sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_FILE_SIZE sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_FILE_TYPE sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_ISR_OBJID sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_LANGUAGE sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_NCREATED_AT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_NCREATED_BY sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_RELEASED_AT sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_RELEASED_BY sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_SEQNR sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_SEQNR_NODE sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_TITLE sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_VALUE sy-vline 
WA_/1FB/MD_________001002G_STR-USMD_VALUE_NODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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