ABAP Select data from SAP table MMDA_PUR_S_PUR_O01 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_O01 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_O01. 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_O01 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_O01 TYPE STANDARD TABLE OF MMDA_PUR_S_PUR_O01,
      WA_MMDA_PUR_S_PUR_O01 TYPE MMDA_PUR_S_PUR_O01,
      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_O01> TYPE MMDA_PUR_S_PUR_O01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MMDA_PUR_S_PUR_O01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MMDA_PUR_S_PUR_O01
  INTO TABLE IT_MMDA_PUR_S_PUR_O01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMDA_PUR_S_PUR_O01
*  INTO TABLE @DATA(IT_MMDA_PUR_S_PUR_O012).
*--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_O01 INDEX 1 INTO DATA(WA_MMDA_PUR_S_PUR_O012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MMDA_PUR_S_PUR_O01 ASSIGNING <MMDA_PUR_S_PUR_O01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMDA_PUR_S_PUR_O01>-OI_EBELN = 1.
<MMDA_PUR_S_PUR_O01>-OI_EBELP = 1.
<MMDA_PUR_S_PUR_O01>-COMPL_DEL = 1.
<MMDA_PUR_S_PUR_O01>-PCONF_QTY = 1.
<MMDA_PUR_S_PUR_O01>-PREQU_QTY = 1.

ENDLOOP.

LOOP AT IT_MMDA_PUR_S_PUR_O01 INTO WA_MMDA_PUR_S_PUR_O01.
*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_O01-PDLV_QTY, sy-vline,
  WA_MMDA_PUR_S_PUR_O01-PDVQEYCR, sy-vline,
  WA_MMDA_PUR_S_PUR_O01-PDVQLECR, sy-vline,
  WA_MMDA_PUR_S_PUR_O01-ENTRY_DATE, sy-vline,
  WA_MMDA_PUR_S_PUR_O01-DOC_DATE, sy-vline,
  WA_MMDA_PUR_S_PUR_O01-PDVQEYSC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMDA_PUR_S_PUR_O01 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_O01 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_O01 INTO WA_MMDA_PUR_S_PUR_O01.


*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_O01-OI_EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-OI_EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MMDA_PUR_S_PUR_O01-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-MATERIAL.
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_O01-PARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-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_O01-SUPPLIER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-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_O01-SUPPL_VEND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-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_O01-SUP_PLANT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-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_O01-VENDOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-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_O01-BASE_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMDA_PUR_S_PUR_O01-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_O01_STR, 
OI_EBELN TYPE STRING,
OI_EBELP TYPE STRING,
COMPL_DEL TYPE STRING,
PCONF_QTY TYPE STRING,
PREQU_QTY TYPE STRING,
PDLV_QTY TYPE STRING,
PDVQEYCR TYPE STRING,
PDVQLECR TYPE STRING,
ENTRY_DATE TYPE STRING,
DOC_DATE TYPE STRING,
PDVQEYSC TYPE STRING,
PDVQLESC TYPE STRING,
PQCOASREQ TYPE STRING,
LOWR_BND TYPE STRING,
UPPR_BND TYPE STRING,
BND_IND TYPE STRING,
NETPRICE TYPE STRING,
MATERIAL TYPE STRING,
MATL_GROUP TYPE STRING,
PARTNER TYPE STRING,
PLANT TYPE STRING,
PURCH_ORG TYPE STRING,
PUR_GROUP TYPE STRING,
STOR_LOC TYPE STRING,
SUPPLIER TYPE STRING,
SUPPL_VEND TYPE STRING,
SUPP_PLANT TYPE STRING,
SUP_PLANT TYPE STRING,
VENDOR TYPE STRING,
LOC_CURRCY TYPE STRING,
BASE_UOM TYPE STRING,
FISCVARNT TYPE STRING,
PRICE_UNIT TYPE STRING,
ITEM_DEL TYPE STRING,
RECORDMODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMDA_PUR_S_PUR_O01_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_O01_STR-OI_EBELN sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-OI_EBELP sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-COMPL_DEL sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PCONF_QTY sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PREQU_QTY sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PDLV_QTY sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PDVQEYCR sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PDVQLECR sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-ENTRY_DATE sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-DOC_DATE sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PDVQEYSC sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PDVQLESC sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PQCOASREQ sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-LOWR_BND sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-UPPR_BND sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-BND_IND sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-NETPRICE sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-MATERIAL sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-MATL_GROUP sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PARTNER sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PLANT sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PURCH_ORG sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PUR_GROUP sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-STOR_LOC sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-SUPPLIER sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-SUPPL_VEND sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-SUPP_PLANT sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-SUP_PLANT sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-VENDOR sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-LOC_CURRCY sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-BASE_UOM sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-FISCVARNT sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-PRICE_UNIT sy-vline 
WA_MMDA_PUR_S_PUR_O01_STR-ITEM_DEL sy-vline 
WA_MMDA_PUR_S_PUR_O01_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.