ABAP Select data from SAP table /MERP/CORE_CLASS_ENTITY_STR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MERP/CORE_CLASS_ENTITY_STR
*  INTO TABLE @DATA(IT_/MERP/CORE_CLASS_ENTITY_STR2).
*--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_/MERP/CORE_CLASS_ENTITY_STR INDEX 1 INTO DATA(WA_/MERP/CORE_CLASS_ENTITY_STR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MERP/CORE_CLASS_ENTITY_STR>-MANDT = 1.
</MERP/CORE_CLASS_ENTITY_STR>-CLINT = 1.
</MERP/CORE_CLASS_ENTITY_STR>-KLART = 1.
</MERP/CORE_CLASS_ENTITY_STR>-CLASS = 1.
</MERP/CORE_CLASS_ENTITY_STR>-STATU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MERP/CORE_CLASS_ENTITY_STR-KLAGR, sy-vline,
  WA_/MERP/CORE_CLASS_ENTITY_STR-BGRSE, sy-vline,
  WA_/MERP/CORE_CLASS_ENTITY_STR-BGRKL, sy-vline,
  WA_/MERP/CORE_CLASS_ENTITY_STR-BGRKP, sy-vline,
  WA_/MERP/CORE_CLASS_ENTITY_STR-ANAME, sy-vline,
  WA_/MERP/CORE_CLASS_ENTITY_STR-ADATU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MERP/CORE_CLASS_ENTITY_STR 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_/MERP/CORE_CLASS_ENTITY_STR 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_/MERP/CORE_CLASS_ENTITY_STR INTO WA_/MERP/CORE_CLASS_ENTITY_STR.


*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 DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MERP/CORE_CLASS_ENTITY_STR-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MERP/CORE_CLASS_ENTITY_STR-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MERP/CORE_CLASS_ENTITY_STR-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MERP/CORE_CLASS_ENTITY_STR-MEINS.
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_/MERP/CORE_CLASS_ENTITY_STR_STR, 
MANDT TYPE STRING,
CLINT TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
STATU TYPE STRING,
KLAGR TYPE STRING,
BGRSE TYPE STRING,
BGRKL TYPE STRING,
BGRKP TYPE STRING,
ANAME TYPE STRING,
ADATU TYPE STRING,
VNAME TYPE STRING,
VDATU TYPE STRING,
VONDT TYPE STRING,
BISDT TYPE STRING,
ANZUO TYPE STRING,
PRAUS TYPE STRING,
SICHT TYPE STRING,
DOKNR TYPE STRING,
DOKAR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
DINKZ TYPE STRING,
NNORM TYPE STRING,
NORMN TYPE STRING,
NORMB TYPE STRING,
NRMT1 TYPE STRING,
NRMT2 TYPE STRING,
AUSGD TYPE STRING,
VERSD TYPE STRING,
VERSI TYPE STRING,
LEIST TYPE STRING,
VERWE TYPE STRING,
SPART TYPE STRING,
LREF3 TYPE STRING,
WWSKZ TYPE STRING,
WWSSI TYPE STRING,
POTPR TYPE STRING,
CLOBK TYPE STRING,
CLMUL TYPE STRING,
CVIEW TYPE STRING,
DISST TYPE STRING,
MEINS TYPE STRING,
CLMOD TYPE STRING,
VWSTL TYPE STRING,
VWPLA TYPE STRING,
CLALT TYPE STRING,
LBREI TYPE STRING,
BNAME TYPE STRING,
MAXBL TYPE STRING,
KNOBJ TYPE STRING,
LOCLA TYPE STRING,
KATALOG TYPE STRING,
KDOKAZ TYPE STRING,
GENRKZ TYPE STRING,
LASTCHANGEDDATETIME TYPE STRING,
KLTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MERP/CORE_CLASS_ENTITY_STR_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_/MERP/CORE_CLASS_ENTITY_STR_STR-MANDT sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-CLINT sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-KLART sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-CLASS sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-STATU sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-KLAGR sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-BGRSE sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-BGRKL sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-BGRKP sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-ANAME sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-ADATU sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VNAME sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VDATU sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VONDT sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-BISDT sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-ANZUO sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-PRAUS sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-SICHT sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-DOKNR sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-DOKAR sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-DOKTL sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-DOKVR sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-DINKZ sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-NNORM sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-NORMN sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-NORMB sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-NRMT1 sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-NRMT2 sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-AUSGD sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VERSD sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VERSI sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-LEIST sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VERWE sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-SPART sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-LREF3 sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-WWSKZ sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-WWSSI sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-POTPR sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-CLOBK sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-CLMUL sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-CVIEW sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-DISST sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-MEINS sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-CLMOD sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VWSTL sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-VWPLA sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-CLALT sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-LBREI sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-BNAME sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-MAXBL sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-KNOBJ sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-LOCLA sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-KATALOG sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-KDOKAZ sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-GENRKZ sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-LASTCHANGEDDATETIME sy-vline 
WA_/MERP/CORE_CLASS_ENTITY_STR_STR-KLTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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