ABAP Select data from SAP table MSIT_CNVIDBASIC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSIT_CNVIDBASIC
*  INTO TABLE @DATA(IT_MSIT_CNVIDBASIC2).
*--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_MSIT_CNVIDBASIC INDEX 1 INTO DATA(WA_MSIT_CNVIDBASIC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSIT_CNVIDBASIC>-DATA = 1.
<MSIT_CNVIDBASIC>-MANDT = 1.
<MSIT_CNVIDBASIC>-CONVID = 1.
<MSIT_CNVIDBASIC>-LMATNR = 1.
<MSIT_CNVIDBASIC>-LMASKE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSIT_CNVIDBASIC-ATRENN, sy-vline,
  WA_MSIT_CNVIDBASIC-ATRENNX, sy-vline,
  WA_MSIT_CNVIDBASIC-LNGEFF, sy-vline,
  WA_MSIT_CNVIDBASIC-MASKE, sy-vline,
  WA_MSIT_CNVIDBASIC-TZ, sy-vline,
  WA_MSIT_CNVIDBASIC-FLAG0, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSIT_CNVIDBASIC 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_MSIT_CNVIDBASIC 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_MSIT_CNVIDBASIC INTO WA_MSIT_CNVIDBASIC.


*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_MSIT_CNVIDBASIC_STR, 
DATA TYPE STRING,
MANDT TYPE STRING,
CONVID TYPE STRING,
LMATNR TYPE STRING,
LMASKE TYPE STRING,
ATRENN TYPE STRING,
ATRENNX TYPE STRING,
LNGEFF TYPE STRING,
MASKE TYPE STRING,
TZ TYPE STRING,
FLAG0 TYPE STRING,
LEXFLAG TYPE STRING,
VCHAR TYPE STRING,
LMATNR_TOTAL TYPE STRING,
LMATNR_VERS TYPE STRING,
MAX_DIFF TYPE STRING,
MVAKT TYPE STRING,
UPDATE_TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSIT_CNVIDBASIC_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_MSIT_CNVIDBASIC_STR-DATA sy-vline 
WA_MSIT_CNVIDBASIC_STR-MANDT sy-vline 
WA_MSIT_CNVIDBASIC_STR-CONVID sy-vline 
WA_MSIT_CNVIDBASIC_STR-LMATNR sy-vline 
WA_MSIT_CNVIDBASIC_STR-LMASKE sy-vline 
WA_MSIT_CNVIDBASIC_STR-ATRENN sy-vline 
WA_MSIT_CNVIDBASIC_STR-ATRENNX sy-vline 
WA_MSIT_CNVIDBASIC_STR-LNGEFF sy-vline 
WA_MSIT_CNVIDBASIC_STR-MASKE sy-vline 
WA_MSIT_CNVIDBASIC_STR-TZ sy-vline 
WA_MSIT_CNVIDBASIC_STR-FLAG0 sy-vline 
WA_MSIT_CNVIDBASIC_STR-LEXFLAG sy-vline 
WA_MSIT_CNVIDBASIC_STR-VCHAR sy-vline 
WA_MSIT_CNVIDBASIC_STR-LMATNR_TOTAL sy-vline 
WA_MSIT_CNVIDBASIC_STR-LMATNR_VERS sy-vline 
WA_MSIT_CNVIDBASIC_STR-MAX_DIFF sy-vline 
WA_MSIT_CNVIDBASIC_STR-MVAKT sy-vline 
WA_MSIT_CNVIDBASIC_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.