ABAP Select data from SAP table PREVMR into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PREVMR 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 PREVMR. 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 PREVMR 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_PREVMR TYPE STANDARD TABLE OF PREVMR,
      WA_PREVMR TYPE PREVMR,
      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: <PREVMR> TYPE PREVMR.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PREVMR
*  INTO TABLE @DATA(IT_PREVMR2).
*--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_PREVMR INDEX 1 INTO DATA(WA_PREVMR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PREVMR>-PRMR_BELNR = 1.
<PREVMR>-PRMR_GR = 1.
<PREVMR>-PRMR_ZWST = 1.
<PREVMR>-PRMR_VZWST = 1.
<PREVMR>-PRMR_NZWST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PREVMR-PRMR_VZWAB, sy-vline,
  WA_PREVMR-PRMR_NZWAB, sy-vline,
  WA_PREVMR-PRMR_ADAT, sy-vline,
  WA_PREVMR-PRMR_ATIM, sy-vline,
  WA_PREVMR-PRMR_HINW, sy-vline,
  WA_PREVMR-PRMR_STAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PREVMR 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_PREVMR 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_PREVMR INTO WA_PREVMR.


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

*Conversion exit HH_MM, internal->external for field PRMR_ATIM
CALL FUNCTION 'CONVERSION_EXIT_HH_MM_OUTPUT'
  EXPORTING
    input =                      WA_PREVMR-PRMR_ATIM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PREVMR-PRMR_ATIM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit HH_MM, internal->external for field PRMR_ATIMREAL
CALL FUNCTION 'CONVERSION_EXIT_HH_MM_OUTPUT'
  EXPORTING
    input =                      WA_PREVMR-PRMR_ATIMREAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PREVMR-PRMR_ATIMREAL.
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_PREVMR_STR, 
PRMR_BELNR TYPE STRING,
PRMR_GR TYPE STRING,
PRMR_ZWST TYPE STRING,
PRMR_VZWST TYPE STRING,
PRMR_NZWST TYPE STRING,
PRMR_VZWAB TYPE STRING,
PRMR_NZWAB TYPE STRING,
PRMR_ADAT TYPE STRING,
PRMR_ATIM TYPE STRING,
PRMR_HINW TYPE STRING,
PRMR_STAT TYPE STRING,
PRMR_ART TYPE STRING,
PRMR_ABLR TYPE STRING,
PRMR_VOR TYPE STRING,
PRMR_NAC TYPE STRING,
PRMR_ADATREAL TYPE STRING,
PRMR_ATIMREAL TYPE STRING,
PRMR_BP TYPE STRING,
PRMR_THGDATUM TYPE STRING,
PRMR_QDPROC TYPE STRING,
PRMR_ABLTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PREVMR_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_PREVMR_STR-PRMR_BELNR sy-vline 
WA_PREVMR_STR-PRMR_GR sy-vline 
WA_PREVMR_STR-PRMR_ZWST sy-vline 
WA_PREVMR_STR-PRMR_VZWST sy-vline 
WA_PREVMR_STR-PRMR_NZWST sy-vline 
WA_PREVMR_STR-PRMR_VZWAB sy-vline 
WA_PREVMR_STR-PRMR_NZWAB sy-vline 
WA_PREVMR_STR-PRMR_ADAT sy-vline 
WA_PREVMR_STR-PRMR_ATIM sy-vline 
WA_PREVMR_STR-PRMR_HINW sy-vline 
WA_PREVMR_STR-PRMR_STAT sy-vline 
WA_PREVMR_STR-PRMR_ART sy-vline 
WA_PREVMR_STR-PRMR_ABLR sy-vline 
WA_PREVMR_STR-PRMR_VOR sy-vline 
WA_PREVMR_STR-PRMR_NAC sy-vline 
WA_PREVMR_STR-PRMR_ADATREAL sy-vline 
WA_PREVMR_STR-PRMR_ATIMREAL sy-vline 
WA_PREVMR_STR-PRMR_BP sy-vline 
WA_PREVMR_STR-PRMR_THGDATUM sy-vline 
WA_PREVMR_STR-PRMR_QDPROC sy-vline 
WA_PREVMR_STR-PRMR_ABLTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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