ABAP Select data from SAP table /MRSS/T_OPT_GEN_LOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_OPT_GEN_LOC
*  INTO TABLE @DATA(IT_/MRSS/T_OPT_GEN_LOC2).
*--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_/MRSS/T_OPT_GEN_LOC INDEX 1 INTO DATA(WA_/MRSS/T_OPT_GEN_LOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_OPT_GEN_LOC>-OPTIMIZER_ID = 1.
</MRSS/T_OPT_GEN_LOC>-ADDRESS_GUID = 1.
</MRSS/T_OPT_GEN_LOC>-ADDRESS_KEY = 1.
</MRSS/T_OPT_GEN_LOC>-STREET = 1.
</MRSS/T_OPT_GEN_LOC>-HOUSE_NUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_OPT_GEN_LOC-CITY, sy-vline,
  WA_/MRSS/T_OPT_GEN_LOC-CITY_DISTRICT, sy-vline,
  WA_/MRSS/T_OPT_GEN_LOC-POST_CODE, sy-vline,
  WA_/MRSS/T_OPT_GEN_LOC-COUNTRY, sy-vline,
  WA_/MRSS/T_OPT_GEN_LOC-REGION, sy-vline,
  WA_/MRSS/T_OPT_GEN_LOC-SEC_ADDRESS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_OPT_GEN_LOC 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_/MRSS/T_OPT_GEN_LOC 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_/MRSS/T_OPT_GEN_LOC INTO WA_/MRSS/T_OPT_GEN_LOC.


*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_/MRSS/T_OPT_GEN_LOC_STR, 
OPTIMIZER_ID TYPE STRING,
ADDRESS_GUID TYPE STRING,
ADDRESS_KEY TYPE STRING,
STREET TYPE STRING,
HOUSE_NUM TYPE STRING,
CITY TYPE STRING,
CITY_DISTRICT TYPE STRING,
POST_CODE TYPE STRING,
COUNTRY TYPE STRING,
REGION TYPE STRING,
SEC_ADDRESS TYPE STRING,
ACTIVE TYPE STRING,
LONGITUDE TYPE STRING,
LATITUDE TYPE STRING,
ALTITUDE TYPE STRING,
PRECISID TYPE STRING,
SOURCE_ID TYPE STRING,
SOURCE_TSTMP TYPE STRING,
ADDRESS_TYPE TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
CHANGED_ON TYPE STRING,
ADDRESS_SOURCE TYPE STRING,
LOCATION TYPE STRING,
BUILDING TYPE STRING,
FLOOR TYPE STRING,
ROOMNUMBER TYPE STRING,
IS_DOUBLE TYPE STRING,
DOUBLE_ID TYPE STRING,
ZONE_LEVEL TYPE STRING,
LEVEL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_OPT_GEN_LOC_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_/MRSS/T_OPT_GEN_LOC_STR-OPTIMIZER_ID sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ADDRESS_GUID sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ADDRESS_KEY sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-STREET sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-HOUSE_NUM sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-CITY sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-CITY_DISTRICT sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-POST_CODE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-COUNTRY sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-REGION sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-SEC_ADDRESS sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ACTIVE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-LONGITUDE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-LATITUDE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ALTITUDE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-PRECISID sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-SOURCE_ID sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-SOURCE_TSTMP sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ADDRESS_TYPE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-VALID_FROM sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-VALID_TO sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-CHANGED_ON sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ADDRESS_SOURCE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-LOCATION sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-BUILDING sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-FLOOR sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ROOMNUMBER sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-IS_DOUBLE sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-DOUBLE_ID sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-ZONE_LEVEL sy-vline 
WA_/MRSS/T_OPT_GEN_LOC_STR-LEVEL sy-vline      INTO ld_text SEPARATED BY SPACE.

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