ABAP Select data from SAP table QCAT_STRU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QCAT_STRU
*  INTO TABLE @DATA(IT_QCAT_STRU2).
*--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_QCAT_STRU INDEX 1 INTO DATA(WA_QCAT_STRU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QCAT_STRU>-OTYPE = 1.
<QCAT_STRU>-OBJID = 1.
<QCAT_STRU>-REALO = 1.
<QCAT_STRU>-SHORT = 1.
<QCAT_STRU>-STEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QCAT_STRU-BEGDA, sy-vline,
  WA_QCAT_STRU-ENDDA, sy-vline,
  WA_QCAT_STRU-SBEGD, sy-vline,
  WA_QCAT_STRU-SENDD, sy-vline,
  WA_QCAT_STRU-ISTAT, sy-vline,
  WA_QCAT_STRU-PRIOX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QCAT_STRU 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_QCAT_STRU 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_QCAT_STRU INTO WA_QCAT_STRU.


*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_QCAT_STRU_STR, 
OTYPE TYPE STRING,
OBJID TYPE STRING,
REALO TYPE STRING,
SHORT TYPE STRING,
STEXT TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
SBEGD TYPE STRING,
SENDD TYPE STRING,
ISTAT TYPE STRING,
PRIOX TYPE STRING,
SEQNR TYPE STRING,
VCOUNT TYPE STRING,
LEVEL TYPE STRING,
VRSIGN TYPE STRING,
VRELAT TYPE STRING,
VBEGDA TYPE STRING,
VENDDA TYPE STRING,
PUP TYPE STRING,
PUP_OTYPE TYPE STRING,
PUP_OBJID TYPE STRING,
PUP_STEXT TYPE STRING,
PUP_BEGDA TYPE STRING,
PUP_ENDDA TYPE STRING,
PUP_ISTAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QCAT_STRU_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_QCAT_STRU_STR-OTYPE sy-vline 
WA_QCAT_STRU_STR-OBJID sy-vline 
WA_QCAT_STRU_STR-REALO sy-vline 
WA_QCAT_STRU_STR-SHORT sy-vline 
WA_QCAT_STRU_STR-STEXT sy-vline 
WA_QCAT_STRU_STR-BEGDA sy-vline 
WA_QCAT_STRU_STR-ENDDA sy-vline 
WA_QCAT_STRU_STR-SBEGD sy-vline 
WA_QCAT_STRU_STR-SENDD sy-vline 
WA_QCAT_STRU_STR-ISTAT sy-vline 
WA_QCAT_STRU_STR-PRIOX sy-vline 
WA_QCAT_STRU_STR-SEQNR sy-vline 
WA_QCAT_STRU_STR-VCOUNT sy-vline 
WA_QCAT_STRU_STR-LEVEL sy-vline 
WA_QCAT_STRU_STR-VRSIGN sy-vline 
WA_QCAT_STRU_STR-VRELAT sy-vline 
WA_QCAT_STRU_STR-VBEGDA sy-vline 
WA_QCAT_STRU_STR-VENDDA sy-vline 
WA_QCAT_STRU_STR-PUP sy-vline 
WA_QCAT_STRU_STR-PUP_OTYPE sy-vline 
WA_QCAT_STRU_STR-PUP_OBJID sy-vline 
WA_QCAT_STRU_STR-PUP_STEXT sy-vline 
WA_QCAT_STRU_STR-PUP_BEGDA sy-vline 
WA_QCAT_STRU_STR-PUP_ENDDA sy-vline 
WA_QCAT_STRU_STR-PUP_ISTAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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