ABAP Select data from SAP table CMAC_ST_SHOW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMAC_ST_SHOW
*  INTO TABLE @DATA(IT_CMAC_ST_SHOW2).
*--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_CMAC_ST_SHOW INDEX 1 INTO DATA(WA_CMAC_ST_SHOW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMAC_ST_SHOW>-CMSTCATT = 1.
<CMAC_ST_SHOW>-CMBENCATT = 1.
<CMAC_ST_SHOW>-CMSTGRPT = 1.
<CMAC_ST_SHOW>-CMPDISCT1T = 1.
<CMAC_ST_SHOW>-CMPDISCT2T = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMAC_ST_SHOW-CMPDISCT3T, sy-vline,
  WA_CMAC_ST_SHOW-CMPDISCT4T, sy-vline,
  WA_CMAC_ST_SHOW-CMPDISCT5T, sy-vline,
  WA_CMAC_ST_SHOW-CMPDISCT6T, sy-vline,
  WA_CMAC_ST_SHOW-CMNATIOT, sy-vline,
  WA_CMAC_ST_SHOW-CMCOMPCODET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMAC_ST_SHOW 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_CMAC_ST_SHOW 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_CMAC_ST_SHOW INTO WA_CMAC_ST_SHOW.


*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_CMAC_ST_SHOW_STR, 
CMSTCATT TYPE STRING,
CMBENCATT TYPE STRING,
CMSTGRPT TYPE STRING,
CMPDISCT1T TYPE STRING,
CMPDISCT2T TYPE STRING,
CMPDISCT3T TYPE STRING,
CMPDISCT4T TYPE STRING,
CMPDISCT5T TYPE STRING,
CMPDISCT6T TYPE STRING,
CMNATIOT TYPE STRING,
CMCOMPCODET TYPE STRING,
CMSTORGT TYPE STRING,
CMVISATYPET TYPE STRING,
CMSTCAMPUST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMAC_ST_SHOW_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_CMAC_ST_SHOW_STR-CMSTCATT sy-vline 
WA_CMAC_ST_SHOW_STR-CMBENCATT sy-vline 
WA_CMAC_ST_SHOW_STR-CMSTGRPT sy-vline 
WA_CMAC_ST_SHOW_STR-CMPDISCT1T sy-vline 
WA_CMAC_ST_SHOW_STR-CMPDISCT2T sy-vline 
WA_CMAC_ST_SHOW_STR-CMPDISCT3T sy-vline 
WA_CMAC_ST_SHOW_STR-CMPDISCT4T sy-vline 
WA_CMAC_ST_SHOW_STR-CMPDISCT5T sy-vline 
WA_CMAC_ST_SHOW_STR-CMPDISCT6T sy-vline 
WA_CMAC_ST_SHOW_STR-CMNATIOT sy-vline 
WA_CMAC_ST_SHOW_STR-CMCOMPCODET sy-vline 
WA_CMAC_ST_SHOW_STR-CMSTORGT sy-vline 
WA_CMAC_ST_SHOW_STR-CMVISATYPET sy-vline 
WA_CMAC_ST_SHOW_STR-CMSTCAMPUST sy-vline      INTO ld_text SEPARATED BY SPACE.

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