ABAP Select data from SAP table CSH2M_CHANGE_MASTER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CSH2M_CHANGE_MASTER 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 CSH2M_CHANGE_MASTER. 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 CSH2M_CHANGE_MASTER 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_CSH2M_CHANGE_MASTER TYPE STANDARD TABLE OF CSH2M_CHANGE_MASTER,
      WA_CSH2M_CHANGE_MASTER TYPE CSH2M_CHANGE_MASTER,
      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: <CSH2M_CHANGE_MASTER> TYPE CSH2M_CHANGE_MASTER.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CSH2M_CHANGE_MASTER.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CSH2M_CHANGE_MASTER
  INTO TABLE IT_CSH2M_CHANGE_MASTER.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSH2M_CHANGE_MASTER
*  INTO TABLE @DATA(IT_CSH2M_CHANGE_MASTER2).
*--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_CSH2M_CHANGE_MASTER INDEX 1 INTO DATA(WA_CSH2M_CHANGE_MASTER2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CSH2M_CHANGE_MASTER ASSIGNING <CSH2M_CHANGE_MASTER>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSH2M_CHANGE_MASTER>-AENNR = 1.
<CSH2M_CHANGE_MASTER>-AENST = 1.
<CSH2M_CHANGE_MASTER>-AENBE = 1.
<CSH2M_CHANGE_MASTER>-DATUV = 1.
<CSH2M_CHANGE_MASTER>-TECHV = 1.

ENDLOOP.

LOOP AT IT_CSH2M_CHANGE_MASTER INTO WA_CSH2M_CHANGE_MASTER.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSH2M_CHANGE_MASTER-ANDAT, sy-vline,
  WA_CSH2M_CHANGE_MASTER-ANNAM, sy-vline,
  WA_CSH2M_CHANGE_MASTER-AEDAT, sy-vline,
  WA_CSH2M_CHANGE_MASTER-AENAM, sy-vline,
  WA_CSH2M_CHANGE_MASTER-AETXT, sy-vline,
  WA_CSH2M_CHANGE_MASTER-LTXSP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSH2M_CHANGE_MASTER 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_CSH2M_CHANGE_MASTER 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_CSH2M_CHANGE_MASTER INTO WA_CSH2M_CHANGE_MASTER.


*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 ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CSH2M_CHANGE_MASTER-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSH2M_CHANGE_MASTER-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field LTXSP
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CSH2M_CHANGE_MASTER-LTXSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CSH2M_CHANGE_MASTER-LTXSP.
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_CSH2M_CHANGE_MASTER_STR, 
AENNR TYPE STRING,
AENST TYPE STRING,
AENBE TYPE STRING,
DATUV TYPE STRING,
TECHV TYPE STRING,
ANDAT TYPE STRING,
ANNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
AETXT TYPE STRING,
LTXSP TYPE STRING,
AEGRU TYPE STRING,
CCART TYPE STRING,
CCSTM TYPE STRING,
DYDAT TYPE STRING,
CONT1 TYPE STRING,
AEFUN TYPE STRING,
UESTR TYPE STRING,
RLKEY TYPE STRING,
LVORM TYPE STRING,
CLINT TYPE STRING,
AERNG TYPE STRING,
RLDAT TYPE STRING,
RLTIM TYPE STRING,
TEREL TYPE STRING,
NACHT TYPE STRING,
INDAT TYPE STRING,
AUDAT TYPE STRING,
FLUSE TYPE STRING,
AEDIF TYPE STRING,
ERLED TYPE STRING,
EFFT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSH2M_CHANGE_MASTER_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_CSH2M_CHANGE_MASTER_STR-AENNR sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AENST sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AENBE sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-DATUV sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-TECHV sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-ANDAT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-ANNAM sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AEDAT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AENAM sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AETXT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-LTXSP sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AEGRU sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-CCART sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-CCSTM sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-DYDAT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-CONT1 sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AEFUN sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-UESTR sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-RLKEY sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-LVORM sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-CLINT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AERNG sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-RLDAT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-RLTIM sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-TEREL sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-NACHT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-INDAT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AUDAT sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-FLUSE sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-AEDIF sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-ERLED sy-vline 
WA_CSH2M_CHANGE_MASTER_STR-EFFT sy-vline      INTO ld_text SEPARATED BY SPACE.

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