ABAP Select data from SAP table CATS_HOURW into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATS_HOURW
*  INTO TABLE @DATA(IT_CATS_HOURW2).
*--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_CATS_HOURW INDEX 1 INTO DATA(WA_CATS_HOURW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATS_HOURW>-SUMDAYW = 1.
<CATS_HOURW>-DAY1 = 1.
<CATS_HOURW>-DAY2 = 1.
<CATS_HOURW>-DAY3 = 1.
<CATS_HOURW>-DAY4 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATS_HOURW-DAY5, sy-vline,
  WA_CATS_HOURW-DAY6, sy-vline,
  WA_CATS_HOURW-DAY7, sy-vline,
  WA_CATS_HOURW-DAY8, sy-vline,
  WA_CATS_HOURW-DAY9, sy-vline,
  WA_CATS_HOURW-DAY10, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATS_HOURW 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_CATS_HOURW 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_CATS_HOURW INTO WA_CATS_HOURW.


*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_CATS_HOURW_STR, 
SUMDAYW TYPE STRING,
DAY1 TYPE STRING,
DAY2 TYPE STRING,
DAY3 TYPE STRING,
DAY4 TYPE STRING,
DAY5 TYPE STRING,
DAY6 TYPE STRING,
DAY7 TYPE STRING,
DAY8 TYPE STRING,
DAY9 TYPE STRING,
DAY10 TYPE STRING,
DAY11 TYPE STRING,
DAY12 TYPE STRING,
DAY13 TYPE STRING,
DAY14 TYPE STRING,
DAY15 TYPE STRING,
DAY16 TYPE STRING,
DAY17 TYPE STRING,
DAY18 TYPE STRING,
DAY19 TYPE STRING,
DAY20 TYPE STRING,
DAY21 TYPE STRING,
DAY22 TYPE STRING,
DAY23 TYPE STRING,
DAY24 TYPE STRING,
DAY25 TYPE STRING,
DAY26 TYPE STRING,
DAY27 TYPE STRING,
DAY28 TYPE STRING,
DAY29 TYPE STRING,
DAY30 TYPE STRING,
DAY31 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATS_HOURW_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_CATS_HOURW_STR-SUMDAYW sy-vline 
WA_CATS_HOURW_STR-DAY1 sy-vline 
WA_CATS_HOURW_STR-DAY2 sy-vline 
WA_CATS_HOURW_STR-DAY3 sy-vline 
WA_CATS_HOURW_STR-DAY4 sy-vline 
WA_CATS_HOURW_STR-DAY5 sy-vline 
WA_CATS_HOURW_STR-DAY6 sy-vline 
WA_CATS_HOURW_STR-DAY7 sy-vline 
WA_CATS_HOURW_STR-DAY8 sy-vline 
WA_CATS_HOURW_STR-DAY9 sy-vline 
WA_CATS_HOURW_STR-DAY10 sy-vline 
WA_CATS_HOURW_STR-DAY11 sy-vline 
WA_CATS_HOURW_STR-DAY12 sy-vline 
WA_CATS_HOURW_STR-DAY13 sy-vline 
WA_CATS_HOURW_STR-DAY14 sy-vline 
WA_CATS_HOURW_STR-DAY15 sy-vline 
WA_CATS_HOURW_STR-DAY16 sy-vline 
WA_CATS_HOURW_STR-DAY17 sy-vline 
WA_CATS_HOURW_STR-DAY18 sy-vline 
WA_CATS_HOURW_STR-DAY19 sy-vline 
WA_CATS_HOURW_STR-DAY20 sy-vline 
WA_CATS_HOURW_STR-DAY21 sy-vline 
WA_CATS_HOURW_STR-DAY22 sy-vline 
WA_CATS_HOURW_STR-DAY23 sy-vline 
WA_CATS_HOURW_STR-DAY24 sy-vline 
WA_CATS_HOURW_STR-DAY25 sy-vline 
WA_CATS_HOURW_STR-DAY26 sy-vline 
WA_CATS_HOURW_STR-DAY27 sy-vline 
WA_CATS_HOURW_STR-DAY28 sy-vline 
WA_CATS_HOURW_STR-DAY29 sy-vline 
WA_CATS_HOURW_STR-DAY30 sy-vline 
WA_CATS_HOURW_STR-DAY31 sy-vline      INTO ld_text SEPARATED BY SPACE.

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