ABAP Select data from SAP table PWSDAYGEN2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PWSDAYGEN2 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 PWSDAYGEN2. 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 PWSDAYGEN2 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_PWSDAYGEN2 TYPE STANDARD TABLE OF PWSDAYGEN2,
      WA_PWSDAYGEN2 TYPE PWSDAYGEN2,
      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: <PWSDAYGEN2> TYPE PWSDAYGEN2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PWSDAYGEN2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PWSDAYGEN2
  INTO TABLE IT_PWSDAYGEN2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PWSDAYGEN2
*  INTO TABLE @DATA(IT_PWSDAYGEN22).
*--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_PWSDAYGEN2 INDEX 1 INTO DATA(WA_PWSDAYGEN22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PWSDAYGEN2 ASSIGNING <PWSDAYGEN2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PWSDAYGEN2>-DATUM = 1.
<PWSDAYGEN2>-MOTPR = 1.
<PWSDAYGEN2>-TPROG = 1.
<PWSDAYGEN2>-VARIA = 1.
<PWSDAYGEN2>-REGEL = 1.

ENDLOOP.

LOOP AT IT_PWSDAYGEN2 INTO WA_PWSDAYGEN2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PWSDAYGEN2-TPKLA, sy-vline,
  WA_PWSDAYGEN2-SOLLZ, sy-vline,
  WA_PWSDAYGEN2-SOMAX, sy-vline,
  WA_PWSDAYGEN2-SOMIN, sy-vline,
  WA_PWSDAYGEN2-VORHO, sy-vline,
  WA_PWSDAYGEN2-ZUSTD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PWSDAYGEN2 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_PWSDAYGEN2 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_PWSDAYGEN2 INTO WA_PWSDAYGEN2.


*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_PWSDAYGEN2_STR, 
DATUM TYPE STRING,
MOTPR TYPE STRING,
TPROG TYPE STRING,
VARIA TYPE STRING,
REGEL TYPE STRING,
TPKLA TYPE STRING,
SOLLZ TYPE STRING,
SOMAX TYPE STRING,
SOMIN TYPE STRING,
VORHO TYPE STRING,
ZUSTD TYPE STRING,
RMEHR TYPE STRING,
RKERN TYPE STRING,
RKEPA TYPE STRING,
STABY TYPE STRING,
OVPOS TYPE STRING,
START_PREV_DAY TYPE STRING,
EMPCT TYPE STRING,
PAMOD TYPE STRING,
MINBEG TYPE STRING,
MAXEND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PWSDAYGEN2_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_PWSDAYGEN2_STR-DATUM sy-vline 
WA_PWSDAYGEN2_STR-MOTPR sy-vline 
WA_PWSDAYGEN2_STR-TPROG sy-vline 
WA_PWSDAYGEN2_STR-VARIA sy-vline 
WA_PWSDAYGEN2_STR-REGEL sy-vline 
WA_PWSDAYGEN2_STR-TPKLA sy-vline 
WA_PWSDAYGEN2_STR-SOLLZ sy-vline 
WA_PWSDAYGEN2_STR-SOMAX sy-vline 
WA_PWSDAYGEN2_STR-SOMIN sy-vline 
WA_PWSDAYGEN2_STR-VORHO sy-vline 
WA_PWSDAYGEN2_STR-ZUSTD sy-vline 
WA_PWSDAYGEN2_STR-RMEHR sy-vline 
WA_PWSDAYGEN2_STR-RKERN sy-vline 
WA_PWSDAYGEN2_STR-RKEPA sy-vline 
WA_PWSDAYGEN2_STR-STABY sy-vline 
WA_PWSDAYGEN2_STR-OVPOS sy-vline 
WA_PWSDAYGEN2_STR-START_PREV_DAY sy-vline 
WA_PWSDAYGEN2_STR-EMPCT sy-vline 
WA_PWSDAYGEN2_STR-PAMOD sy-vline 
WA_PWSDAYGEN2_STR-MINBEG sy-vline 
WA_PWSDAYGEN2_STR-MAXEND sy-vline      INTO ld_text SEPARATED BY SPACE.

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