ABAP Select data from SAP table CNVOM_S_LINK_MWBGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNVOM_S_LINK_MWBGEN
*  INTO TABLE @DATA(IT_CNVOM_S_LINK_MWBGEN2).
*--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_CNVOM_S_LINK_MWBGEN INDEX 1 INTO DATA(WA_CNVOM_S_LINK_MWBGEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNVOM_S_LINK_MWBGEN>-WS_GUID = 1.
<CNVOM_S_LINK_MWBGEN>-WSPOS = 1.
<CNVOM_S_LINK_MWBGEN>-MWBOBJNAME_GEN = 1.
<CNVOM_S_LINK_MWBGEN>-ROOT_TABID = 1.
<CNVOM_S_LINK_MWBGEN>-ROOT_TABLE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNVOM_S_LINK_MWBGEN-HEADTABLE, sy-vline,
  WA_CNVOM_S_LINK_MWBGEN-HEADTABLE_TYPE, sy-vline,
  WA_CNVOM_S_LINK_MWBGEN-FILTER_TABLE, sy-vline,
  WA_CNVOM_S_LINK_MWBGEN-META_FINGERPRINT, sy-vline,
  WA_CNVOM_S_LINK_MWBGEN-MWB_PROJ, sy-vline,
  WA_CNVOM_S_LINK_MWBGEN-MWB_SPRO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNVOM_S_LINK_MWBGEN 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_CNVOM_S_LINK_MWBGEN 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_CNVOM_S_LINK_MWBGEN INTO WA_CNVOM_S_LINK_MWBGEN.


*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_CNVOM_S_LINK_MWBGEN_STR, 
WS_GUID TYPE STRING,
WSPOS TYPE STRING,
MWBOBJNAME_GEN TYPE STRING,
ROOT_TABID TYPE STRING,
ROOT_TABLE TYPE STRING,
HEADTABLE TYPE STRING,
HEADTABLE_TYPE TYPE STRING,
FILTER_TABLE TYPE STRING,
META_FINGERPRINT TYPE STRING,
MWB_PROJ TYPE STRING,
MWB_SPRO TYPE STRING,
MWB_MTID TYPE STRING,
KB_PROJ_GUID TYPE STRING,
GENSTATE TYPE STRING,
RULESTATE TYPE STRING,
FLG_LOCKED TYPE STRING,
CLC_BLOCKED_STEP TYPE STRING,
MAN_BLOCKED_STEP TYPE STRING,
MWBOBJNAME TYPE STRING,
MWBOBJ_SEQNO TYPE STRING,
READ_TYPE TYPE STRING,
WRT_BEHAV TYPE STRING,
TAB_PARALL TYPE STRING,
MAX_PORTION TYPE STRING,
TRF_DELETE TYPE STRING,
TRF_PRESEL_TAB TYPE STRING,
TRF_SIMULATE TYPE STRING,
MWBOBJNAME_RO TYPE STRING,
PACKAGE_SIZE TYPE STRING,
FOR_ALL_ENTRIES TYPE STRING,
MAX_IN_BLOCK TYPE STRING,
PARALLEL_HINT TYPE STRING,
GEN_U_STRUCT TYPE STRING,
SIZE_CAT TYPE STRING,
SELECTION TYPE STRING,
PRESEL_TAB TYPE STRING,
EXTLINK TYPE STRING,
USE_IOBT TYPE STRING,
IOBT_METHOD TYPE STRING,
INCR_PROC_OPT TYPE STRING,
GEN_USER TYPE STRING,
GEN_TIMESTAMP TYPE STRING,
RAS_USER TYPE STRING,
RAS_TIMESTAMP TYPE STRING,
TAB_LINKS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNVOM_S_LINK_MWBGEN_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_CNVOM_S_LINK_MWBGEN_STR-WS_GUID sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-WSPOS sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MWBOBJNAME_GEN sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-ROOT_TABID sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-ROOT_TABLE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-HEADTABLE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-HEADTABLE_TYPE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-FILTER_TABLE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-META_FINGERPRINT sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MWB_PROJ sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MWB_SPRO sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MWB_MTID sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-KB_PROJ_GUID sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-GENSTATE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-RULESTATE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-FLG_LOCKED sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-CLC_BLOCKED_STEP sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MAN_BLOCKED_STEP sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MWBOBJNAME sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MWBOBJ_SEQNO sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-READ_TYPE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-WRT_BEHAV sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-TAB_PARALL sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MAX_PORTION sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-TRF_DELETE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-TRF_PRESEL_TAB sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-TRF_SIMULATE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MWBOBJNAME_RO sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-PACKAGE_SIZE sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-FOR_ALL_ENTRIES sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-MAX_IN_BLOCK sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-PARALLEL_HINT sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-GEN_U_STRUCT sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-SIZE_CAT sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-SELECTION sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-PRESEL_TAB sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-EXTLINK sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-USE_IOBT sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-IOBT_METHOD sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-INCR_PROC_OPT sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-GEN_USER sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-GEN_TIMESTAMP sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-RAS_USER sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-RAS_TIMESTAMP sy-vline 
WA_CNVOM_S_LINK_MWBGEN_STR-TAB_LINKS sy-vline      INTO ld_text SEPARATED BY SPACE.

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