ABAP Select data from SAP table IQQCAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IQQCAT
*  INTO TABLE @DATA(IT_IQQCAT2).
*--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_IQQCAT INDEX 1 INTO DATA(WA_IQQCAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IQQCAT>-QNAME = 1.
<IQQCAT>-OLDQNAME = 1.
<IQQCAT>-OLDUNAME = 1.
<IQQCAT>-OLDWS = 1.
<IQQCAT>-LTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IQQCAT-STRUC, sy-vline,
  WA_IQQCAT-STDFILTER, sy-vline,
  WA_IQQCAT-ISNAME, sy-vline,
  WA_IQQCAT-OLDQ, sy-vline,
  WA_IQQCAT-OLDDEVC, sy-vline,
  WA_IQQCAT-OLDISNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IQQCAT 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_IQQCAT 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_IQQCAT INTO WA_IQQCAT.


*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_IQQCAT_STR, 
QNAME TYPE STRING,
OLDQNAME TYPE STRING,
OLDUNAME TYPE STRING,
OLDWS TYPE STRING,
LTYPE TYPE STRING,
STRUC TYPE STRING,
STDFILTER TYPE STRING,
ISNAME TYPE STRING,
OLDQ TYPE STRING,
OLDDEVC TYPE STRING,
OLDISNAME TYPE STRING,
AUTHOR TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CHANGEDBY TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,
RANKPOS TYPE STRING,
QTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IQQCAT_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_IQQCAT_STR-QNAME sy-vline 
WA_IQQCAT_STR-OLDQNAME sy-vline 
WA_IQQCAT_STR-OLDUNAME sy-vline 
WA_IQQCAT_STR-OLDWS sy-vline 
WA_IQQCAT_STR-LTYPE sy-vline 
WA_IQQCAT_STR-STRUC sy-vline 
WA_IQQCAT_STR-STDFILTER sy-vline 
WA_IQQCAT_STR-ISNAME sy-vline 
WA_IQQCAT_STR-OLDQ sy-vline 
WA_IQQCAT_STR-OLDDEVC sy-vline 
WA_IQQCAT_STR-OLDISNAME sy-vline 
WA_IQQCAT_STR-AUTHOR sy-vline 
WA_IQQCAT_STR-CRDATE sy-vline 
WA_IQQCAT_STR-CRTIME sy-vline 
WA_IQQCAT_STR-CHANGEDBY sy-vline 
WA_IQQCAT_STR-CHDATE sy-vline 
WA_IQQCAT_STR-CHTIME sy-vline 
WA_IQQCAT_STR-RANKPOS sy-vline 
WA_IQQCAT_STR-QTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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