ABAP Select data from SAP table CONTRACT_METER_DATA_T into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CONTRACT_METER_DATA_T
*  INTO TABLE @DATA(IT_CONTRACT_METER_DATA_T2).
*--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_CONTRACT_METER_DATA_T INDEX 1 INTO DATA(WA_CONTRACT_METER_DATA_T2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CONTRACT_METER_DATA_T>-PARTNER = 1.
<CONTRACT_METER_DATA_T>-CONTRACT_ACCOUNT = 1.
<CONTRACT_METER_DATA_T>-PREMISE_ID = 1.
<CONTRACT_METER_DATA_T>-CONTRACT = 1.
<CONTRACT_METER_DATA_T>-DEVICE_NO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CONTRACT_METER_DATA_T-DEVICE_CAT, sy-vline,
  WA_CONTRACT_METER_DATA_T-DEVICE_CAT_DESC, sy-vline,
  WA_CONTRACT_METER_DATA_T-REGISTER, sy-vline,
  WA_CONTRACT_METER_DATA_T-REGISTER_TYPE, sy-vline,
  WA_CONTRACT_METER_DATA_T-REGISTER_TYPE_TXT, sy-vline,
  WA_CONTRACT_METER_DATA_T-REGISTER_CODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CONTRACT_METER_DATA_T 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_CONTRACT_METER_DATA_T 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_CONTRACT_METER_DATA_T INTO WA_CONTRACT_METER_DATA_T.


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

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

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

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

*Conversion exit GERNR, internal->external for field DEVICE_NO
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_CONTRACT_METER_DATA_T-DEVICE_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CONTRACT_METER_DATA_T-DEVICE_NO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field DEVICE_CAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_CONTRACT_METER_DATA_T-DEVICE_CAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CONTRACT_METER_DATA_T-DEVICE_CAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CONTRACT_METER_DATA_T-UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CONTRACT_METER_DATA_T-UOM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MR_ID_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CONTRACT_METER_DATA_T-MR_ID_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CONTRACT_METER_DATA_T-MR_ID_NUMBER.
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_CONTRACT_METER_DATA_T_STR, 
PARTNER TYPE STRING,
CONTRACT_ACCOUNT TYPE STRING,
PREMISE_ID TYPE STRING,
CONTRACT TYPE STRING,
DEVICE_NO TYPE STRING,
DEVICE_CAT TYPE STRING,
DEVICE_CAT_DESC TYPE STRING,
REGISTER TYPE STRING,
REGISTER_TYPE TYPE STRING,
REGISTER_TYPE_TXT TYPE STRING,
REGISTER_CODE TYPE STRING,
DIVISION TYPE STRING,
DIVISION_DESC TYPE STRING,
MR_TSTMP TYPE STRING,
MR_TYPE TYPE STRING,
MR_TYPE_DESC TYPE STRING,
MR_CATEGORY TYPE STRING,
MR_CATEGORY_DESC TYPE STRING,
MR_REASON TYPE STRING,
MR_REASON_DESC TYPE STRING,
MR_RESULT TYPE STRING,
MR_POST_DECIMAL TYPE STRING,
UOM TYPE STRING,
CURR_MR_RESULT TYPE STRING,
PREV_MR_TSTMP TYPE STRING,
IMPLAUSIBLE TYPE STRING,
MR_DIFF TYPE STRING,
MR_ID_NUMBER TYPE STRING,
MR_STATUS TYPE STRING,
MR_STATUS_DESC TYPE STRING,
CONSUMPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CONTRACT_METER_DATA_T_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_CONTRACT_METER_DATA_T_STR-PARTNER sy-vline 
WA_CONTRACT_METER_DATA_T_STR-CONTRACT_ACCOUNT sy-vline 
WA_CONTRACT_METER_DATA_T_STR-PREMISE_ID sy-vline 
WA_CONTRACT_METER_DATA_T_STR-CONTRACT sy-vline 
WA_CONTRACT_METER_DATA_T_STR-DEVICE_NO sy-vline 
WA_CONTRACT_METER_DATA_T_STR-DEVICE_CAT sy-vline 
WA_CONTRACT_METER_DATA_T_STR-DEVICE_CAT_DESC sy-vline 
WA_CONTRACT_METER_DATA_T_STR-REGISTER sy-vline 
WA_CONTRACT_METER_DATA_T_STR-REGISTER_TYPE sy-vline 
WA_CONTRACT_METER_DATA_T_STR-REGISTER_TYPE_TXT sy-vline 
WA_CONTRACT_METER_DATA_T_STR-REGISTER_CODE sy-vline 
WA_CONTRACT_METER_DATA_T_STR-DIVISION sy-vline 
WA_CONTRACT_METER_DATA_T_STR-DIVISION_DESC sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_TSTMP sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_TYPE sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_TYPE_DESC sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_CATEGORY sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_CATEGORY_DESC sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_REASON sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_REASON_DESC sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_RESULT sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_POST_DECIMAL sy-vline 
WA_CONTRACT_METER_DATA_T_STR-UOM sy-vline 
WA_CONTRACT_METER_DATA_T_STR-CURR_MR_RESULT sy-vline 
WA_CONTRACT_METER_DATA_T_STR-PREV_MR_TSTMP sy-vline 
WA_CONTRACT_METER_DATA_T_STR-IMPLAUSIBLE sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_DIFF sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_ID_NUMBER sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_STATUS sy-vline 
WA_CONTRACT_METER_DATA_T_STR-MR_STATUS_DESC sy-vline 
WA_CONTRACT_METER_DATA_T_STR-CONSUMPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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