ABAP Select data from SAP table MMDA_PUR_S_PUR_O02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MMDA_PUR_S_PUR_O02 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 MMDA_PUR_S_PUR_O02. 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 MMDA_PUR_S_PUR_O02 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_MMDA_PUR_S_PUR_O02 TYPE STANDARD TABLE OF MMDA_PUR_S_PUR_O02,
      WA_MMDA_PUR_S_PUR_O02 TYPE MMDA_PUR_S_PUR_O02,
      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: <MMDA_PUR_S_PUR_O02> TYPE MMDA_PUR_S_PUR_O02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MMDA_PUR_S_PUR_O02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MMDA_PUR_S_PUR_O02
  INTO TABLE IT_MMDA_PUR_S_PUR_O02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMDA_PUR_S_PUR_O02
*  INTO TABLE @DATA(IT_MMDA_PUR_S_PUR_O022).
*--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_MMDA_PUR_S_PUR_O02 INDEX 1 INTO DATA(WA_MMDA_PUR_S_PUR_O022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MMDA_PUR_S_PUR_O02 ASSIGNING <MMDA_PUR_S_PUR_O02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMDA_PUR_S_PUR_O02>-OI_EBELN = 1.
<MMDA_PUR_S_PUR_O02>-DOC_ITEMS = 1.
<MMDA_PUR_S_PUR_O02>-PDVIEYCR = 1.
<MMDA_PUR_S_PUR_O02>-PDVVEYCR = 1.
<MMDA_PUR_S_PUR_O02>-PDVILECR = 1.

ENDLOOP.

LOOP AT IT_MMDA_PUR_S_PUR_O02 INTO WA_MMDA_PUR_S_PUR_O02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMDA_PUR_S_PUR_O02-PDVVLECR, sy-vline,
  WA_MMDA_PUR_S_PUR_O02-PDVIELCR, sy-vline,
  WA_MMDA_PUR_S_PUR_O02-PDVVELCR, sy-vline,
  WA_MMDA_PUR_S_PUR_O02-PDVIOVER, sy-vline,
  WA_MMDA_PUR_S_PUR_O02-PDVVOVER, sy-vline,
  WA_MMDA_PUR_S_PUR_O02-PDVIUNDR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMDA_PUR_S_PUR_O02 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_MMDA_PUR_S_PUR_O02 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_MMDA_PUR_S_PUR_O02 INTO WA_MMDA_PUR_S_PUR_O02.


*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 OI_EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O02-OI_EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O02-OI_EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O02-PARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O02-PARTNER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SUPPLIER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O02-SUPPLIER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O02-SUPPLIER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SUPPL_VEND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O02-SUPPL_VEND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O02-SUPPL_VEND.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SUP_PLANT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O02-SUP_PLANT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O02-SUP_PLANT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VENDOR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O02-VENDOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O02-VENDOR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BASE_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O02-BASE_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O02-BASE_UOM.
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_MMDA_PUR_S_PUR_O02_STR, 
OI_EBELN TYPE STRING,
DOC_ITEMS TYPE STRING,
PDVIEYCR TYPE STRING,
PDVVEYCR TYPE STRING,
PDVILECR TYPE STRING,
PDVVLECR TYPE STRING,
PDVIELCR TYPE STRING,
PDVVELCR TYPE STRING,
PDVIOVER TYPE STRING,
PDVVOVER TYPE STRING,
PDVIUNDR TYPE STRING,
PDVVUNDR TYPE STRING,
PDVIEYSC TYPE STRING,
PDVVEYSC TYPE STRING,
PDVILESC TYPE STRING,
PDVVLESC TYPE STRING,
PDVIELSC TYPE STRING,
PDVVELSC TYPE STRING,
PICOASREQ TYPE STRING,
PVCOASREQ TYPE STRING,
ENTRY_DATE TYPE STRING,
DOC_DATE TYPE STRING,
PARTNER TYPE STRING,
PURCH_ORG TYPE STRING,
PUR_GROUP TYPE STRING,
SUPPLIER TYPE STRING,
SUPPL_VEND TYPE STRING,
SUPP_PLANT TYPE STRING,
SUP_PLANT TYPE STRING,
VENDOR TYPE STRING,
LOC_CURRCY TYPE STRING,
FISCVARNT TYPE STRING,
PDLV_VAL TYPE STRING,
PCONF_VAL TYPE STRING,
PREQU_VAL TYPE STRING,
BASE_UOM TYPE STRING,
HEADER_DEL TYPE STRING,
RECORDMODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMDA_PUR_S_PUR_O02_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_MMDA_PUR_S_PUR_O02_STR-OI_EBELN sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-DOC_ITEMS sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVIEYCR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVEYCR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVILECR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVLECR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVIELCR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVELCR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVIOVER sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVOVER sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVIUNDR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVUNDR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVIEYSC sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVEYSC sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVILESC sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVLESC sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVIELSC sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDVVELSC sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PICOASREQ sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PVCOASREQ sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-ENTRY_DATE sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-DOC_DATE sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PARTNER sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PURCH_ORG sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PUR_GROUP sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-SUPPLIER sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-SUPPL_VEND sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-SUPP_PLANT sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-SUP_PLANT sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-VENDOR sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-LOC_CURRCY sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-FISCVARNT sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PDLV_VAL sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PCONF_VAL sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-PREQU_VAL sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-BASE_UOM sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-HEADER_DEL sy-vline 
WA_MMDA_PUR_S_PUR_O02_STR-RECORDMODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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