ABAP Select data from SAP table COMT_PR_CATEGORY_MAINTAIN_GEN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP COMT_PR_CATEGORY_MAINTAIN_GEN 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_PR_CATEGORY_MAINTAIN_GEN. 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_PR_CATEGORY_MAINTAIN_GEN 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_PR_CATEGORY_MAINTAIN_GEN TYPE STANDARD TABLE OF COMT_PR_CATEGORY_MAINTAIN_GEN,
      WA_COMT_PR_CATEGORY_MAINTAIN_GEN TYPE COMT_PR_CATEGORY_MAINTAIN_GEN,
      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_PR_CATEGORY_MAINTAIN_GEN> TYPE COMT_PR_CATEGORY_MAINTAIN_GEN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COMT_PR_CATEGORY_MAINTAIN_GEN
*  INTO TABLE @DATA(IT_COMT_PR_CATEGORY_MAINTAIN_GEN2).
*--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_PR_CATEGORY_MAINTAIN_GEN INDEX 1 INTO DATA(WA_COMT_PR_CATEGORY_MAINTAIN_GEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COMT_PR_CATEGORY_MAINTAIN_GEN>-CATEGORY = 1.
<COMT_PR_CATEGORY_MAINTAIN_GEN>-CLIENT = 1.
<COMT_PR_CATEGORY_MAINTAIN_GEN>-CATEGORY_GUID = 1.
<COMT_PR_CATEGORY_MAINTAIN_GEN>-CATEGORY_ID = 1.
<COMT_PR_CATEGORY_MAINTAIN_GEN>-HIERARCHY_GUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COMT_PR_CATEGORY_MAINTAIN_GEN-PARENT_GUID, sy-vline,
  WA_COMT_PR_CATEGORY_MAINTAIN_GEN-NON_ASSIGNABLE, sy-vline,
  WA_COMT_PR_CATEGORY_MAINTAIN_GEN-VALID_FROM, sy-vline,
  WA_COMT_PR_CATEGORY_MAINTAIN_GEN-VALID_TO, sy-vline,
  WA_COMT_PR_CATEGORY_MAINTAIN_GEN-UPNAME, sy-vline,
  WA_COMT_PR_CATEGORY_MAINTAIN_GEN-HISTEX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COMT_PR_CATEGORY_MAINTAIN_GEN 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_PR_CATEGORY_MAINTAIN_GEN 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_PR_CATEGORY_MAINTAIN_GEN INTO WA_COMT_PR_CATEGORY_MAINTAIN_GEN.


*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 TSTPS, internal->external for field VALID_FROM
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_COMT_PR_CATEGORY_MAINTAIN_GEN-VALID_FROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_PR_CATEGORY_MAINTAIN_GEN-VALID_FROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTPS, internal->external for field VALID_TO
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_COMT_PR_CATEGORY_MAINTAIN_GEN-VALID_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_PR_CATEGORY_MAINTAIN_GEN-VALID_TO.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field PARENT_LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COMT_PR_CATEGORY_MAINTAIN_GEN-PARENT_LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COMT_PR_CATEGORY_MAINTAIN_GEN-PARENT_LOGSYS.
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_COMT_PR_CATEGORY_MAINTAIN_GEN_STR, 
CATEGORY TYPE STRING,
CLIENT TYPE STRING,
CATEGORY_GUID TYPE STRING,
CATEGORY_ID TYPE STRING,
HIERARCHY_GUID TYPE STRING,
PARENT_GUID TYPE STRING,
NON_ASSIGNABLE TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
UPNAME TYPE STRING,
HISTEX TYPE STRING,
LOGSYS TYPE STRING,
PARENT_ID TYPE STRING,
PARENT_LOGSYS TYPE STRING,
PRODUCT_CATEGORY TYPE STRING,
PRODUCT_TYPE TYPE STRING,
AUTH_GROUP TYPE STRING,
RESPONSIBLE_PERS TYPE STRING,
OBJECT_FAMILY TYPE STRING,
NON_SELECTABLE TYPE STRING,
ID_TYPE TYPE STRING,
NO_DOCUMENTS TYPE STRING,
NO_PRICE_COND TYPE STRING,
PARTNER_DET_PROC TYPE STRING,
COMPETITOR_PROD TYPE STRING,
ECM TYPE STRING,
PRODUCT_TEMPLATE TYPE STRING,
TEXT TYPE STRING,
SETTYPES TYPE STRING,
ATTRIBUTES TYPE STRING,
ATTRIBUTES_ORGD TYPE STRING,
RELTYPES TYPE STRING,
UPDATE_TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COMT_PR_CATEGORY_MAINTAIN_GEN_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_PR_CATEGORY_MAINTAIN_GEN_STR-CATEGORY sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-CLIENT sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-CATEGORY_GUID sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-CATEGORY_ID sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-HIERARCHY_GUID sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-PARENT_GUID sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-NON_ASSIGNABLE sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-VALID_FROM sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-VALID_TO sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-UPNAME sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-HISTEX sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-LOGSYS sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-PARENT_ID sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-PARENT_LOGSYS sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-PRODUCT_CATEGORY sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-PRODUCT_TYPE sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-AUTH_GROUP sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-RESPONSIBLE_PERS sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-OBJECT_FAMILY sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-NON_SELECTABLE sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-ID_TYPE sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-NO_DOCUMENTS sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-NO_PRICE_COND sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-PARTNER_DET_PROC sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-COMPETITOR_PROD sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-ECM sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-PRODUCT_TEMPLATE sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-TEXT sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-SETTYPES sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-ATTRIBUTES sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-ATTRIBUTES_ORGD sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-RELTYPES sy-vline 
WA_COMT_PR_CATEGORY_MAINTAIN_GEN_STR-UPDATE_TYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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