ABAP Select data from SAP table COD_S_METER_READING into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COD_S_METER_READING
*  INTO TABLE @DATA(IT_COD_S_METER_READING2).
*--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_COD_S_METER_READING INDEX 1 INTO DATA(WA_COD_S_METER_READING2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COD_S_METER_READING>-MATERIAL = 1.
<COD_S_METER_READING>-SERIALNO = 1.
<COD_S_METER_READING>-REGISTER = 1.
<COD_S_METER_READING>-MRREASON = 1.
<COD_S_METER_READING>-MRIDNUMBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COD_S_METER_READING-READINGRESULT, sy-vline,
  WA_COD_S_METER_READING-METERREADINGNOTE, sy-vline,
  WA_COD_S_METER_READING-ACTUALCUSTOMERMRTYPE, sy-vline,
  WA_COD_S_METER_READING-METERREADER, sy-vline,
  WA_COD_S_METER_READING-MRDATEFORBILLING, sy-vline,
  WA_COD_S_METER_READING-MRTIMEFORBILLING, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COD_S_METER_READING 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_COD_S_METER_READING 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_COD_S_METER_READING INTO WA_COD_S_METER_READING.


*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 EQUIPMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_COD_S_METER_READING-EQUIPMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_COD_S_METER_READING-EQUIPMENT.
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_COD_S_METER_READING_STR, 
MATERIAL TYPE STRING,
SERIALNO TYPE STRING,
REGISTER TYPE STRING,
MRREASON TYPE STRING,
MRIDNUMBER TYPE STRING,
READINGRESULT TYPE STRING,
METERREADINGNOTE TYPE STRING,
ACTUALCUSTOMERMRTYPE TYPE STRING,
METERREADER TYPE STRING,
MRDATEFORBILLING TYPE STRING,
MRTIMEFORBILLING TYPE STRING,
ACTUALMRDATE TYPE STRING,
ACTUALMRTIME TYPE STRING,
MRDATEOFMAXIMUM TYPE STRING,
MRTIMEOFMAXIMUM TYPE STRING,
SMORDER TYPE STRING,
ACTIVE TYPE STRING,
REFNUMBER TYPE STRING,
TARGETMRDATE TYPE STRING,
EXT_UI TYPE STRING,
MRDATEFORIDENTIF TYPE STRING,
DIVISION TYPE STRING,
DEVICE TYPE STRING,
STATUS TYPE STRING,
EQUIPMENT TYPE STRING,
INSTALLATION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COD_S_METER_READING_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_COD_S_METER_READING_STR-MATERIAL sy-vline 
WA_COD_S_METER_READING_STR-SERIALNO sy-vline 
WA_COD_S_METER_READING_STR-REGISTER sy-vline 
WA_COD_S_METER_READING_STR-MRREASON sy-vline 
WA_COD_S_METER_READING_STR-MRIDNUMBER sy-vline 
WA_COD_S_METER_READING_STR-READINGRESULT sy-vline 
WA_COD_S_METER_READING_STR-METERREADINGNOTE sy-vline 
WA_COD_S_METER_READING_STR-ACTUALCUSTOMERMRTYPE sy-vline 
WA_COD_S_METER_READING_STR-METERREADER sy-vline 
WA_COD_S_METER_READING_STR-MRDATEFORBILLING sy-vline 
WA_COD_S_METER_READING_STR-MRTIMEFORBILLING sy-vline 
WA_COD_S_METER_READING_STR-ACTUALMRDATE sy-vline 
WA_COD_S_METER_READING_STR-ACTUALMRTIME sy-vline 
WA_COD_S_METER_READING_STR-MRDATEOFMAXIMUM sy-vline 
WA_COD_S_METER_READING_STR-MRTIMEOFMAXIMUM sy-vline 
WA_COD_S_METER_READING_STR-SMORDER sy-vline 
WA_COD_S_METER_READING_STR-ACTIVE sy-vline 
WA_COD_S_METER_READING_STR-REFNUMBER sy-vline 
WA_COD_S_METER_READING_STR-TARGETMRDATE sy-vline 
WA_COD_S_METER_READING_STR-EXT_UI sy-vline 
WA_COD_S_METER_READING_STR-MRDATEFORIDENTIF sy-vline 
WA_COD_S_METER_READING_STR-DIVISION sy-vline 
WA_COD_S_METER_READING_STR-DEVICE sy-vline 
WA_COD_S_METER_READING_STR-STATUS sy-vline 
WA_COD_S_METER_READING_STR-EQUIPMENT sy-vline 
WA_COD_S_METER_READING_STR-INSTALLATION sy-vline      INTO ld_text SEPARATED BY SPACE.

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