ABAP Select data from SAP table MMPUR_S_RELSTRAT_CHARCLASS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_S_RELSTRAT_CHARCLASS
*  INTO TABLE @DATA(IT_MMPUR_S_RELSTRAT_CHARCLASS2).
*--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_MMPUR_S_RELSTRAT_CHARCLASS INDEX 1 INTO DATA(WA_MMPUR_S_RELSTRAT_CHARCLASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_S_RELSTRAT_CHARCLASS>-MANDT = 1.
<MMPUR_S_RELSTRAT_CHARCLASS>-CLINT = 1.
<MMPUR_S_RELSTRAT_CHARCLASS>-POSNR = 1.
<MMPUR_S_RELSTRAT_CHARCLASS>-ADZHL = 1.
<MMPUR_S_RELSTRAT_CHARCLASS>-ABTEI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_S_RELSTRAT_CHARCLASS-DINKB, sy-vline,
  WA_MMPUR_S_RELSTRAT_CHARCLASS-HERKU, sy-vline,
  WA_MMPUR_S_RELSTRAT_CHARCLASS-IMERK, sy-vline,
  WA_MMPUR_S_RELSTRAT_CHARCLASS-OMERK, sy-vline,
  WA_MMPUR_S_RELSTRAT_CHARCLASS-KLART, sy-vline,
  WA_MMPUR_S_RELSTRAT_CHARCLASS-RELEV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_S_RELSTRAT_CHARCLASS 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_MMPUR_S_RELSTRAT_CHARCLASS 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_MMPUR_S_RELSTRAT_CHARCLASS INTO WA_MMPUR_S_RELSTRAT_CHARCLASS.


*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 ATINN, internal->external for field IMERK
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_S_RELSTRAT_CHARCLASS-IMERK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_S_RELSTRAT_CHARCLASS-IMERK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ATINN, internal->external for field OMERK
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_S_RELSTRAT_CHARCLASS-OMERK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_S_RELSTRAT_CHARCLASS-OMERK.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_S_RELSTRAT_CHARCLASS-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_S_RELSTRAT_CHARCLASS-AENNR.
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_MMPUR_S_RELSTRAT_CHARCLASS_STR, 
MANDT TYPE STRING,
CLINT TYPE STRING,
POSNR TYPE STRING,
ADZHL TYPE STRING,
ABTEI TYPE STRING,
DINKB TYPE STRING,
HERKU TYPE STRING,
IMERK TYPE STRING,
OMERK TYPE STRING,
KLART TYPE STRING,
RELEV TYPE STRING,
DATUV TYPE STRING,
TECHV TYPE STRING,
AENNR TYPE STRING,
LKENZ TYPE STRING,
VMERK TYPE STRING,
DPLEN TYPE STRING,
OFFST TYPE STRING,
BLLIN TYPE STRING,
DPTXT TYPE STRING,
CUSTR TYPE STRING,
JUSTR TYPE STRING,
COLOR TYPE STRING,
INTSF TYPE STRING,
INVER TYPE STRING,
CKBOX TYPE STRING,
INPUT TYPE STRING,
AMERK TYPE STRING,
MKENN TYPE STRING,
DATUB TYPE STRING,
PPREL TYPE STRING,
EWM_REL TYPE STRING,
PROP_REL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_S_RELSTRAT_CHARCLASS_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_MMPUR_S_RELSTRAT_CHARCLASS_STR-MANDT sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-CLINT sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-POSNR sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-ADZHL sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-ABTEI sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-DINKB sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-HERKU sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-IMERK sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-OMERK sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-KLART sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-RELEV sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-DATUV sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-TECHV sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-AENNR sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-LKENZ sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-VMERK sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-DPLEN sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-OFFST sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-BLLIN sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-DPTXT sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-CUSTR sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-JUSTR sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-COLOR sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-INTSF sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-INVER sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-CKBOX sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-INPUT sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-AMERK sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-MKENN sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-DATUB sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-PPREL sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-EWM_REL sy-vline 
WA_MMPUR_S_RELSTRAT_CHARCLASS_STR-PROP_REL sy-vline      INTO ld_text SEPARATED BY SPACE.

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