ABAP Select data from SAP table COMT_PROD_SRV_MAINTAIN_API into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMT_PROD_SRV_MAINTAIN_API
*  INTO TABLE @DATA(IT_COMT_PROD_SRV_MAINTAIN_API2).
*--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_COMT_PROD_SRV_MAINTAIN_API INDEX 1 INTO DATA(WA_COMT_PROD_SRV_MAINTAIN_API2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMT_PROD_SRV_MAINTAIN_API>-PR_NUMBER = 1.
<COMT_PROD_SRV_MAINTAIN_API>-MNT_SETTYPE = 1.
<COMT_PROD_SRV_MAINTAIN_API>-BUDGETBILLING = 1.
<COMT_PROD_SRV_MAINTAIN_API>-COMM_PROD_VAR = 1.
<COMT_PROD_SRV_MAINTAIN_API>-COMM_PR_PUR_1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMT_PROD_SRV_MAINTAIN_API-COMM_PR_UNIT, sy-vline,
  WA_COMT_PROD_SRV_MAINTAIN_API-COM_COMMERCIAL, sy-vline,
  WA_COMT_PROD_SRV_MAINTAIN_API-CONSUMPTOFFP, sy-vline,
  WA_COMT_PROD_SRV_MAINTAIN_API-CONSUMPTONP, sy-vline,
  WA_COMT_PROD_SRV_MAINTAIN_API-CONSUMPT, sy-vline,
  WA_COMT_PROD_SRV_MAINTAIN_API-CRMT_SET_TOPR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMT_PROD_SRV_MAINTAIN_API 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_COMT_PROD_SRV_MAINTAIN_API 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_COMT_PROD_SRV_MAINTAIN_API INTO WA_COMT_PROD_SRV_MAINTAIN_API.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_COMT_PROD_SRV_MAINTAIN_API_STR, 
PR_NUMBER TYPE STRING,
MNT_SETTYPE TYPE STRING,
BUDGETBILLING TYPE STRING,
COMM_PROD_VAR TYPE STRING,
COMM_PR_PUR_1 TYPE STRING,
COMM_PR_UNIT TYPE STRING,
COM_COMMERCIAL TYPE STRING,
CONSUMPTOFFP TYPE STRING,
CONSUMPTONP TYPE STRING,
CONSUMPT TYPE STRING,
CRMT_SET_TOPR TYPE STRING,
CRM_ISU_PACK TYPE STRING,
CRM_ISU_VERS TYPE STRING,
CRM_ISX_ACASSI TYPE STRING,
CRM_ISX_COUNTR TYPE STRING,
CRM_ISX_CPASSI TYPE STRING,
CRM_ISX_CPASST TYPE STRING,
CRM_ISX_DCASSI TYPE STRING,
CRM_ISX_EOASSI TYPE STRING,
CRM_ISX_EOPARA TYPE STRING,
CRM_ISX_PARAM TYPE STRING,
CRM_ISX_PAYMNT TYPE STRING,
CRM_ISX_SERVIC TYPE STRING,
CRM_ISX_TECRES TYPE STRING,
CRM_ISX_VERSNT TYPE STRING,
CRM_ISX_VERSN TYPE STRING,
CRM_PS_ATTR TYPE STRING,
ECRM_GRID_PRC TYPE STRING,
ECRM_GRID_X_PR TYPE STRING,
ECRM_ISU_CALC0 TYPE STRING,
ECRM_ISU_GRID TYPE STRING,
ECRM_OUTL_CONT TYPE STRING,
ECRM_PROD_TYPE TYPE STRING,
INDUSTRYSECTOR TYPE STRING,
ISU_POD_X_GRID TYPE STRING,
PAYMENTPLAN TYPE STRING,
PRREF TYPE STRING,
PSSC_ATTRIBUTE TYPE STRING,
CRM_ISU_ADDR TYPE STRING,
CRM_AMI_PROD TYPE STRING,
CRM_ISU_ATTR TYPE STRING,
CRM_ISU_PDET TYPE STRING,
CRM_ISU_PROD TYPE STRING,
CRM_ISU_VALUES TYPE STRING,
ISU_PRICES TYPE STRING,
CRM_ISU_ATTR2 TYPE STRING,
CRM_ISU_BRF TYPE STRING,
CRM_ISU_PRTYP TYPE STRING,
CRM_ISU_VALCON TYPE STRING,
CRM_ISU_VALRNG TYPE STRING,
CRM_ISU_GROUPS TYPE STRING,
CRM_ISU_PR_LNK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMT_PROD_SRV_MAINTAIN_API_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_COMT_PROD_SRV_MAINTAIN_API_STR-PR_NUMBER sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-MNT_SETTYPE sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-BUDGETBILLING sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-COMM_PROD_VAR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-COMM_PR_PUR_1 sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-COMM_PR_UNIT sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-COM_COMMERCIAL sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CONSUMPTOFFP sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CONSUMPTONP sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CONSUMPT sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRMT_SET_TOPR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_PACK sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_VERS sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_ACASSI sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_COUNTR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_CPASSI sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_CPASST sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_DCASSI sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_EOASSI sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_EOPARA sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_PARAM sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_PAYMNT sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_SERVIC sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_TECRES sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_VERSNT sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISX_VERSN sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_PS_ATTR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ECRM_GRID_PRC sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ECRM_GRID_X_PR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ECRM_ISU_CALC0 sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ECRM_ISU_GRID sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ECRM_OUTL_CONT sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ECRM_PROD_TYPE sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-INDUSTRYSECTOR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ISU_POD_X_GRID sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-PAYMENTPLAN sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-PRREF sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-PSSC_ATTRIBUTE sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_ADDR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_AMI_PROD sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_ATTR sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_PDET sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_PROD sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_VALUES sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-ISU_PRICES sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_ATTR2 sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_BRF sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_PRTYP sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_VALCON sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_VALRNG sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_GROUPS sy-vline 
WA_COMT_PROD_SRV_MAINTAIN_API_STR-CRM_ISU_PR_LNK sy-vline      INTO ld_text SEPARATED BY SPACE.

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