ABAP Select data from SAP table CNMM_RESB_MANDATORY_FLDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNMM_RESB_MANDATORY_FLDS
*  INTO TABLE @DATA(IT_CNMM_RESB_MANDATORY_FLDS2).
*--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_CNMM_RESB_MANDATORY_FLDS INDEX 1 INTO DATA(WA_CNMM_RESB_MANDATORY_FLDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNMM_RESB_MANDATORY_FLDS>-RSNUM = 1.
<CNMM_RESB_MANDATORY_FLDS>-POSNR = 1.
<CNMM_RESB_MANDATORY_FLDS>-RSPOS = 1.
<CNMM_RESB_MANDATORY_FLDS>-RSART = 1.
<CNMM_RESB_MANDATORY_FLDS>-AUFPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNMM_RESB_MANDATORY_FLDS-APLZL, sy-vline,
  WA_CNMM_RESB_MANDATORY_FLDS-PSPEL, sy-vline,
  WA_CNMM_RESB_MANDATORY_FLDS-KDAUF, sy-vline,
  WA_CNMM_RESB_MANDATORY_FLDS-KDPOS, sy-vline,
  WA_CNMM_RESB_MANDATORY_FLDS-AUFNR, sy-vline,
  WA_CNMM_RESB_MANDATORY_FLDS-VORNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNMM_RESB_MANDATORY_FLDS 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_CNMM_RESB_MANDATORY_FLDS 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_CNMM_RESB_MANDATORY_FLDS INTO WA_CNMM_RESB_MANDATORY_FLDS.


*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 NUMCV, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_RESB_MANDATORY_FLDS-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_RESB_MANDATORY_FLDS-POSNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_RESB_MANDATORY_FLDS-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_RESB_MANDATORY_FLDS-PSPEL.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_RESB_MANDATORY_FLDS-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_RESB_MANDATORY_FLDS-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field UVORN
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_RESB_MANDATORY_FLDS-UVORN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_RESB_MANDATORY_FLDS-UVORN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_RESB_MANDATORY_FLDS-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_RESB_MANDATORY_FLDS-MEINS.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field ADRN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_RESB_MANDATORY_FLDS-ADRN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_RESB_MANDATORY_FLDS-ADRN2.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ISOLA, internal->external for field LTXSP
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_RESB_MANDATORY_FLDS-LTXSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_RESB_MANDATORY_FLDS-LTXSP.
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_CNMM_RESB_MANDATORY_FLDS_STR, 
RSNUM TYPE STRING,
POSNR TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
PSPEL TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
AUFNR TYPE STRING,
VORNR TYPE STRING,
UVORN TYPE STRING,
OBJNR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
SORTF TYPE STRING,
MATKL TYPE STRING,
EKGRP TYPE STRING,
BDTER TYPE STRING,
BDMNG TYPE STRING,
ENMNG TYPE STRING,
VMENG TYPE STRING,
MEINS TYPE STRING,
POSTP TYPE STRING,
NO_DISP TYPE STRING,
EKORG TYPE STRING,
INFNR TYPE STRING,
LIFNR TYPE STRING,
AFNAM TYPE STRING,
WEMPF TYPE STRING,
BEDNR TYPE STRING,
ABLAD TYPE STRING,
NPTXTKY TYPE STRING,
FLGEX TYPE STRING,
DBSKZ TYPE STRING,
VORAB TYPE STRING,
SOBKZ TYPE STRING,
ADRNR TYPE STRING,
ADRN2 TYPE STRING,
KUNNR TYPE STRING,
EMLIF TYPE STRING,
XWAOK TYPE STRING,
KZEAR TYPE STRING,
XFEHL TYPE STRING,
CLAKZ TYPE STRING,
XLOEK TYPE STRING,
CUOBJ TYPE STRING,
POTX1 TYPE STRING,
LTXSP TYPE STRING,
PBDNR TYPE STRING,
CREADAT TYPE STRING,
CREABY TYPE STRING,
CHANGEDAT TYPE STRING,
CHANGEBY TYPE STRING,
NODE_KEY TYPE STRING,
T_BESCH TYPE STRING,
KTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNMM_RESB_MANDATORY_FLDS_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_CNMM_RESB_MANDATORY_FLDS_STR-RSNUM sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-POSNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-RSPOS sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-RSART sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-AUFPL sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-APLZL sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-PSPEL sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-KDAUF sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-KDPOS sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-AUFNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-VORNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-UVORN sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-OBJNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-MATNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-WERKS sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-SORTF sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-MATKL sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-EKGRP sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-BDTER sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-BDMNG sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-ENMNG sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-VMENG sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-MEINS sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-POSTP sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-NO_DISP sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-EKORG sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-INFNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-LIFNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-AFNAM sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-WEMPF sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-BEDNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-ABLAD sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-NPTXTKY sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-FLGEX sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-DBSKZ sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-VORAB sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-SOBKZ sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-ADRNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-ADRN2 sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-KUNNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-EMLIF sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-XWAOK sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-KZEAR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-XFEHL sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-CLAKZ sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-XLOEK sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-CUOBJ sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-POTX1 sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-LTXSP sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-PBDNR sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-CREADAT sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-CREABY sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-CHANGEDAT sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-CHANGEBY sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-NODE_KEY sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-T_BESCH sy-vline 
WA_CNMM_RESB_MANDATORY_FLDS_STR-KTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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