ABAP Select data from SAP table P01C_WATAB into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP P01C_WATAB 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 P01C_WATAB. 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 P01C_WATAB 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_P01C_WATAB TYPE STANDARD TABLE OF P01C_WATAB,
      WA_P01C_WATAB TYPE P01C_WATAB,
      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: <P01C_WATAB> TYPE P01C_WATAB.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P01C_WATAB.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P01C_WATAB
  INTO TABLE IT_P01C_WATAB.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P01C_WATAB
*  INTO TABLE @DATA(IT_P01C_WATAB2).
*--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_P01C_WATAB INDEX 1 INTO DATA(WA_P01C_WATAB2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P01C_WATAB ASSIGNING <P01C_WATAB>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P01C_WATAB>-HANSP = 1.
<P01C_WATAB>-OBJPS = 1.
<P01C_WATAB>-PRITY = 1.
<P01C_WATAB>-JBEWE = 1.
<P01C_WATAB>-WMETH = 1.

ENDLOOP.

LOOP AT IT_P01C_WATAB INTO WA_P01C_WATAB.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P01C_WATAB-CMETH, sy-vline,
  WA_P01C_WATAB-LGAGP, sy-vline,
  WA_P01C_WATAB-BETR1, sy-vline,
  WA_P01C_WATAB-BETR2, sy-vline,
  WA_P01C_WATAB-WPRZN, sy-vline,
  WA_P01C_WATAB-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P01C_WATAB 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_P01C_WATAB 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_P01C_WATAB INTO WA_P01C_WATAB.


*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_P01C_WATAB_STR, 
HANSP TYPE STRING,
OBJPS TYPE STRING,
PRITY TYPE STRING,
JBEWE TYPE STRING,
WMETH TYPE STRING,
CMETH TYPE STRING,
LGAGP TYPE STRING,
BETR1 TYPE STRING,
BETR2 TYPE STRING,
WPRZN TYPE STRING,
WAERS TYPE STRING,
NVAEG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P01C_WATAB_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_P01C_WATAB_STR-HANSP sy-vline 
WA_P01C_WATAB_STR-OBJPS sy-vline 
WA_P01C_WATAB_STR-PRITY sy-vline 
WA_P01C_WATAB_STR-JBEWE sy-vline 
WA_P01C_WATAB_STR-WMETH sy-vline 
WA_P01C_WATAB_STR-CMETH sy-vline 
WA_P01C_WATAB_STR-LGAGP sy-vline 
WA_P01C_WATAB_STR-BETR1 sy-vline 
WA_P01C_WATAB_STR-BETR2 sy-vline 
WA_P01C_WATAB_STR-WPRZN sy-vline 
WA_P01C_WATAB_STR-WAERS sy-vline 
WA_P01C_WATAB_STR-NVAEG sy-vline      INTO ld_text SEPARATED BY SPACE.

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