ABAP Select data from SAP table CEMTRRDNGORDER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CEMTRRDNGORDER
*  INTO TABLE @DATA(IT_CEMTRRDNGORDER2).
*--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_CEMTRRDNGORDER INDEX 1 INTO DATA(WA_CEMTRRDNGORDER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CEMTRRDNGORDER>-MANDT = 1.
<CEMTRRDNGORDER>-METERREADINGDOCUMENT = 1.
<CEMTRRDNGORDER>-UTILITIESINSTALLATION = 1.
<CEMTRRDNGORDER>-METERREADINGREASON = 1.
<CEMTRRDNGORDER>-METERREADINGUNIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CEMTRRDNGORDER-METERREADINGUNITNAME, sy-vline,
  WA_CEMTRRDNGORDER-METERREADINGRSNSCHEDULEDDATE, sy-vline,
  WA_CEMTRRDNGORDER-SCHEDULEDUTILITIESBILLINGDATE, sy-vline,
  WA_CEMTRRDNGORDER-NMBROFMETERREADINGORDS, sy-vline,
  WA_CEMTRRDNGORDER-UTILITIESPORTION, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_CEMTRRDNGORDER 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_CEMTRRDNGORDER 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_CEMTRRDNGORDER INTO WA_CEMTRRDNGORDER.


*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 METERREADINGDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CEMTRRDNGORDER-METERREADINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CEMTRRDNGORDER-METERREADINGDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field UTILITIESINSTALLATION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CEMTRRDNGORDER-UTILITIESINSTALLATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CEMTRRDNGORDER-UTILITIESINSTALLATION.
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_CEMTRRDNGORDER_STR, 
MANDT TYPE STRING,
METERREADINGDOCUMENT TYPE STRING,
UTILITIESINSTALLATION TYPE STRING,
METERREADINGREASON TYPE STRING,
METERREADINGUNIT TYPE STRING,
METERREADINGUNITNAME TYPE STRING,
METERREADINGRSNSCHEDULEDDATE TYPE STRING,
SCHEDULEDUTILITIESBILLINGDATE TYPE STRING,
NMBROFMETERREADINGORDS TYPE STRING,
UTILITIESPORTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CEMTRRDNGORDER_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_CEMTRRDNGORDER_STR-MANDT sy-vline 
WA_CEMTRRDNGORDER_STR-METERREADINGDOCUMENT sy-vline 
WA_CEMTRRDNGORDER_STR-UTILITIESINSTALLATION sy-vline 
WA_CEMTRRDNGORDER_STR-METERREADINGREASON sy-vline 
WA_CEMTRRDNGORDER_STR-METERREADINGUNIT sy-vline 
WA_CEMTRRDNGORDER_STR-METERREADINGUNITNAME sy-vline 
WA_CEMTRRDNGORDER_STR-METERREADINGRSNSCHEDULEDDATE sy-vline 
WA_CEMTRRDNGORDER_STR-SCHEDULEDUTILITIESBILLINGDATE sy-vline 
WA_CEMTRRDNGORDER_STR-NMBROFMETERREADINGORDS sy-vline 
WA_CEMTRRDNGORDER_STR-UTILITIESPORTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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