ABAP Select data from SAP table /SAPAPO/CTM_SUBST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPAPO/CTM_SUBST 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 /SAPAPO/CTM_SUBST. 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 /SAPAPO/CTM_SUBST 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_/SAPAPO/CTM_SUBST TYPE STANDARD TABLE OF /SAPAPO/CTM_SUBST,
      WA_/SAPAPO/CTM_SUBST TYPE /SAPAPO/CTM_SUBST,
      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: </SAPAPO/CTM_SUBST> TYPE /SAPAPO/CTM_SUBST.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPAPO/CTM_SUBST
  INTO TABLE IT_/SAPAPO/CTM_SUBST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/CTM_SUBST
*  INTO TABLE @DATA(IT_/SAPAPO/CTM_SUBST2).
*--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_/SAPAPO/CTM_SUBST INDEX 1 INTO DATA(WA_/SAPAPO/CTM_SUBST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPAPO/CTM_SUBST ASSIGNING </SAPAPO/CTM_SUBST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/CTM_SUBST>-SUBSTKEY = 1.
</SAPAPO/CTM_SUBST>-LOCIDFR = 1.
</SAPAPO/CTM_SUBST>-MATIDFR = 1.
</SAPAPO/CTM_SUBST>-LOCIDTO = 1.
</SAPAPO/CTM_SUBST>-MATIDTO = 1.

ENDLOOP.

LOOP AT IT_/SAPAPO/CTM_SUBST INTO WA_/SAPAPO/CTM_SUBST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/CTM_SUBST-DATEF, sy-vline,
  WA_/SAPAPO/CTM_SUBST-DATET, sy-vline,
  WA_/SAPAPO/CTM_SUBST-RULEUSAGE, sy-vline,
  WA_/SAPAPO/CTM_SUBST-OBJECTTYPE, sy-vline,
  WA_/SAPAPO/CTM_SUBST-SEQUENCE, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/CTM_SUBST 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_/SAPAPO/CTM_SUBST 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_/SAPAPO/CTM_SUBST INTO WA_/SAPAPO/CTM_SUBST.


*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_/SAPAPO/CTM_SUBST_STR, 
SUBSTKEY TYPE STRING,
LOCIDFR TYPE STRING,
MATIDFR TYPE STRING,
LOCIDTO TYPE STRING,
MATIDTO TYPE STRING,
DATEF TYPE STRING,
DATET TYPE STRING,
RULEUSAGE TYPE STRING,
OBJECTTYPE TYPE STRING,
SEQUENCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/CTM_SUBST_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_/SAPAPO/CTM_SUBST_STR-SUBSTKEY sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-LOCIDFR sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-MATIDFR sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-LOCIDTO sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-MATIDTO sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-DATEF sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-DATET sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-RULEUSAGE sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-OBJECTTYPE sy-vline 
WA_/SAPAPO/CTM_SUBST_STR-SEQUENCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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