ABAP Select data from SAP table CNMMDATES into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNMMDATES
*  INTO TABLE @DATA(IT_CNMMDATES2).
*--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_CNMMDATES INDEX 1 INTO DATA(WA_CNMMDATES2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNMMDATES>-RSNUM = 1.
<CNMMDATES>-RSPOS = 1.
<CNMMDATES>-RSART = 1.
<CNMMDATES>-ICONS = 1.
<CNMMDATES>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNMMDATES-WERKS, sy-vline,
  WA_CNMMDATES-MAKTX, sy-vline,
  WA_CNMMDATES-AUDISP, sy-vline,
  WA_CNMMDATES-BDTER, sy-vline,
  WA_CNMMDATES-KWBDTER, sy-vline,
  WA_CNMMDATES-BANFN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNMMDATES 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_CNMMDATES 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_CNMMDATES INTO WA_CNMMDATES.


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

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

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

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

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

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

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CNMMDATES-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMMDATES-MJAHR.
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_CNMMDATES_STR, 
RSNUM TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
ICONS TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
MAKTX TYPE STRING,
AUDISP TYPE STRING,
BDTER TYPE STRING,
KWBDTER TYPE STRING,
BANFN TYPE STRING,
BNFPO TYPE STRING,
EBAKZ TYPE STRING,
BADAT TYPE STRING,
KWBADAT TYPE STRING,
LFDAT TYPE STRING,
KWLFDAT TYPE STRING,
FRGDT TYPE STRING,
KWFRGDT TYPE STRING,
RFQ_EBELN TYPE STRING,
RFQ_EBELP TYPE STRING,
STATU TYPE STRING,
ABSKZ TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ELIKZ TYPE STRING,
EREKZ TYPE STRING,
AEDAT TYPE STRING,
KWAEDAT TYPE STRING,
EINDT TYPE STRING,
KWEINDT TYPE STRING,
XEKET TYPE STRING,
XEKES TYPE STRING,
XEKBE TYPE STRING,
VBELN_VL TYPE STRING,
D_POSNR TYPE STRING,
ERDAT_LIPS TYPE STRING,
KWERDAT_LIPS TYPE STRING,
LFDAT_LIPS TYPE STRING,
KWLFDAT_LIPS TYPE STRING,
MBDAT_LIPS TYPE STRING,
KWMBDAT_LIPS TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
ZEILE TYPE STRING,
SHKZG TYPE STRING,
BUDAT_MSEG TYPE STRING,
KWBUDAT_MSEG TYPE STRING,
BWART TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNMMDATES_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_CNMMDATES_STR-RSNUM sy-vline 
WA_CNMMDATES_STR-RSPOS sy-vline 
WA_CNMMDATES_STR-RSART sy-vline 
WA_CNMMDATES_STR-ICONS sy-vline 
WA_CNMMDATES_STR-MATNR sy-vline 
WA_CNMMDATES_STR-WERKS sy-vline 
WA_CNMMDATES_STR-MAKTX sy-vline 
WA_CNMMDATES_STR-AUDISP sy-vline 
WA_CNMMDATES_STR-BDTER sy-vline 
WA_CNMMDATES_STR-KWBDTER sy-vline 
WA_CNMMDATES_STR-BANFN sy-vline 
WA_CNMMDATES_STR-BNFPO sy-vline 
WA_CNMMDATES_STR-EBAKZ sy-vline 
WA_CNMMDATES_STR-BADAT sy-vline 
WA_CNMMDATES_STR-KWBADAT sy-vline 
WA_CNMMDATES_STR-LFDAT sy-vline 
WA_CNMMDATES_STR-KWLFDAT sy-vline 
WA_CNMMDATES_STR-FRGDT sy-vline 
WA_CNMMDATES_STR-KWFRGDT sy-vline 
WA_CNMMDATES_STR-RFQ_EBELN sy-vline 
WA_CNMMDATES_STR-RFQ_EBELP sy-vline 
WA_CNMMDATES_STR-STATU sy-vline 
WA_CNMMDATES_STR-ABSKZ sy-vline 
WA_CNMMDATES_STR-EBELN sy-vline 
WA_CNMMDATES_STR-EBELP sy-vline 
WA_CNMMDATES_STR-ELIKZ sy-vline 
WA_CNMMDATES_STR-EREKZ sy-vline 
WA_CNMMDATES_STR-AEDAT sy-vline 
WA_CNMMDATES_STR-KWAEDAT sy-vline 
WA_CNMMDATES_STR-EINDT sy-vline 
WA_CNMMDATES_STR-KWEINDT sy-vline 
WA_CNMMDATES_STR-XEKET sy-vline 
WA_CNMMDATES_STR-XEKES sy-vline 
WA_CNMMDATES_STR-XEKBE sy-vline 
WA_CNMMDATES_STR-VBELN_VL sy-vline 
WA_CNMMDATES_STR-D_POSNR sy-vline 
WA_CNMMDATES_STR-ERDAT_LIPS sy-vline 
WA_CNMMDATES_STR-KWERDAT_LIPS sy-vline 
WA_CNMMDATES_STR-LFDAT_LIPS sy-vline 
WA_CNMMDATES_STR-KWLFDAT_LIPS sy-vline 
WA_CNMMDATES_STR-MBDAT_LIPS sy-vline 
WA_CNMMDATES_STR-KWMBDAT_LIPS sy-vline 
WA_CNMMDATES_STR-MBLNR sy-vline 
WA_CNMMDATES_STR-MJAHR sy-vline 
WA_CNMMDATES_STR-ZEILE sy-vline 
WA_CNMMDATES_STR-SHKZG sy-vline 
WA_CNMMDATES_STR-BUDAT_MSEG sy-vline 
WA_CNMMDATES_STR-KWBUDAT_MSEG sy-vline 
WA_CNMMDATES_STR-BWART sy-vline      INTO ld_text SEPARATED BY SPACE.

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