ABAP Select data from SAP table MMPUR_UI_PR_WL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MMPUR_UI_PR_WL 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_UI_PR_WL. 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_UI_PR_WL 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_UI_PR_WL TYPE STANDARD TABLE OF MMPUR_UI_PR_WL,
      WA_MMPUR_UI_PR_WL TYPE MMPUR_UI_PR_WL,
      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_UI_PR_WL> TYPE MMPUR_UI_PR_WL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_UI_PR_WL
*  INTO TABLE @DATA(IT_MMPUR_UI_PR_WL2).
*--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_UI_PR_WL INDEX 1 INTO DATA(WA_MMPUR_UI_PR_WL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_UI_PR_WL>-GENERATED_ID = 1.
<MMPUR_UI_PR_WL>-CNT = 1.
<MMPUR_UI_PR_WL>-MANDT = 1.
<MMPUR_UI_PR_WL>-PURCHASEREQUISITION = 1.
<MMPUR_UI_PR_WL>-PURREQNDESCRIPTION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_UI_PR_WL-PURREQNLIFECYCLESTATUS, sy-vline,
  WA_MMPUR_UI_PR_WL-NUMBEROFITEMS, sy-vline,
  WA_MMPUR_UI_PR_WL-TOTALNETAMOUNT, sy-vline,
  WA_MMPUR_UI_PR_WL-CURRENCY, sy-vline,
  WA_MMPUR_UI_PR_WL-MATERIAL, sy-vline,
  WA_MMPUR_UI_PR_WL-MATERIALNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_UI_PR_WL 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_UI_PR_WL 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_UI_PR_WL INTO WA_MMPUR_UI_PR_WL.


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

*Conversion exit MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_UI_PR_WL-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_UI_PR_WL-MATERIAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SUPPLIER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_UI_PR_WL-SUPPLIER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_UI_PR_WL-SUPPLIER.
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_UI_PR_WL_STR, 
GENERATED_ID TYPE STRING,
CNT TYPE STRING,
MANDT TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURREQNDESCRIPTION TYPE STRING,
PURREQNLIFECYCLESTATUS TYPE STRING,
NUMBEROFITEMS TYPE STRING,
TOTALNETAMOUNT TYPE STRING,
CURRENCY TYPE STRING,
MATERIAL TYPE STRING,
MATERIALNAME TYPE STRING,
SUPPLIER TYPE STRING,
SUPPLIERNAME TYPE STRING,
CREATIONDATE TYPE STRING,
PURREQNSSPREQUESTOR TYPE STRING,
PURREQNLIFECYCLESTATUSNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_UI_PR_WL_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_UI_PR_WL_STR-GENERATED_ID sy-vline 
WA_MMPUR_UI_PR_WL_STR-CNT sy-vline 
WA_MMPUR_UI_PR_WL_STR-MANDT sy-vline 
WA_MMPUR_UI_PR_WL_STR-PURCHASEREQUISITION sy-vline 
WA_MMPUR_UI_PR_WL_STR-PURREQNDESCRIPTION sy-vline 
WA_MMPUR_UI_PR_WL_STR-PURREQNLIFECYCLESTATUS sy-vline 
WA_MMPUR_UI_PR_WL_STR-NUMBEROFITEMS sy-vline 
WA_MMPUR_UI_PR_WL_STR-TOTALNETAMOUNT sy-vline 
WA_MMPUR_UI_PR_WL_STR-CURRENCY sy-vline 
WA_MMPUR_UI_PR_WL_STR-MATERIAL sy-vline 
WA_MMPUR_UI_PR_WL_STR-MATERIALNAME sy-vline 
WA_MMPUR_UI_PR_WL_STR-SUPPLIER sy-vline 
WA_MMPUR_UI_PR_WL_STR-SUPPLIERNAME sy-vline 
WA_MMPUR_UI_PR_WL_STR-CREATIONDATE sy-vline 
WA_MMPUR_UI_PR_WL_STR-PURREQNSSPREQUESTOR sy-vline 
WA_MMPUR_UI_PR_WL_STR-PURREQNLIFECYCLESTATUSNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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