ABAP Select data from SAP table GRPCQLIBRARY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GRPCQLIBRARY
*  INTO TABLE @DATA(IT_GRPCQLIBRARY2).
*--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_GRPCQLIBRARY INDEX 1 INTO DATA(WA_GRPCQLIBRARY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GRPCQLIBRARY>-MANDT = 1.
<GRPCQLIBRARY>-QUESTION_ID = 1.
<GRPCQLIBRARY>-SURVEY_REF = 1.
<GRPCQLIBRARY>-ISACTIVE = 1.
<GRPCQLIBRARY>-QCATEGORY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GRPCQLIBRARY-ATYPE, sy-vline,
  WA_GRPCQLIBRARY-RTYPE, sy-vline,
  WA_GRPCQLIBRARY-ACOMMENT, sy-vline,
  WA_GRPCQLIBRARY-ACOMMENT1, sy-vline,
  WA_GRPCQLIBRARY-CRTDBY, sy-vline,
  WA_GRPCQLIBRARY-CRTDDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GRPCQLIBRARY 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_GRPCQLIBRARY 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_GRPCQLIBRARY INTO WA_GRPCQLIBRARY.


*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_GRPCQLIBRARY_STR, 
MANDT TYPE STRING,
QUESTION_ID TYPE STRING,
SURVEY_REF TYPE STRING,
ISACTIVE TYPE STRING,
QCATEGORY TYPE STRING,
ATYPE TYPE STRING,
RTYPE TYPE STRING,
ACOMMENT TYPE STRING,
ACOMMENT1 TYPE STRING,
CRTDBY TYPE STRING,
CRTDDT TYPE STRING,
CRTDTM TYPE STRING,
MDFDBY TYPE STRING,
MDFDDT TYPE STRING,
MDFDTM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GRPCQLIBRARY_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_GRPCQLIBRARY_STR-MANDT sy-vline 
WA_GRPCQLIBRARY_STR-QUESTION_ID sy-vline 
WA_GRPCQLIBRARY_STR-SURVEY_REF sy-vline 
WA_GRPCQLIBRARY_STR-ISACTIVE sy-vline 
WA_GRPCQLIBRARY_STR-QCATEGORY sy-vline 
WA_GRPCQLIBRARY_STR-ATYPE sy-vline 
WA_GRPCQLIBRARY_STR-RTYPE sy-vline 
WA_GRPCQLIBRARY_STR-ACOMMENT sy-vline 
WA_GRPCQLIBRARY_STR-ACOMMENT1 sy-vline 
WA_GRPCQLIBRARY_STR-CRTDBY sy-vline 
WA_GRPCQLIBRARY_STR-CRTDDT sy-vline 
WA_GRPCQLIBRARY_STR-CRTDTM sy-vline 
WA_GRPCQLIBRARY_STR-MDFDBY sy-vline 
WA_GRPCQLIBRARY_STR-MDFDDT sy-vline 
WA_GRPCQLIBRARY_STR-MDFDTM sy-vline      INTO ld_text SEPARATED BY SPACE.

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