ABAP Select data from SAP table WSTI_WD_CRE_MLT_DOC_HEAD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSTI_WD_CRE_MLT_DOC_HEAD
*  INTO TABLE @DATA(IT_WSTI_WD_CRE_MLT_DOC_HEAD2).
*--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_WSTI_WD_CRE_MLT_DOC_HEAD INDEX 1 INTO DATA(WA_WSTI_WD_CRE_MLT_DOC_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSTI_WD_CRE_MLT_DOC_HEAD>-TEMP_NO = 1.
<WSTI_WD_CRE_MLT_DOC_HEAD>-IBLNR = 1.
<WSTI_WD_CRE_MLT_DOC_HEAD>-GJAHR = 1.
<WSTI_WD_CRE_MLT_DOC_HEAD>-LGORT = 1.
<WSTI_WD_CRE_MLT_DOC_HEAD>-LGOBE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSTI_WD_CRE_MLT_DOC_HEAD-SOBKZ, sy-vline,
  WA_WSTI_WD_CRE_MLT_DOC_HEAD-SOTXT, sy-vline,
  WA_WSTI_WD_CRE_MLT_DOC_HEAD-GIDAT, sy-vline,
  WA_WSTI_WD_CRE_MLT_DOC_HEAD-MATKL, sy-vline,
  WA_WSTI_WD_CRE_MLT_DOC_HEAD-WGBEZ, sy-vline,
  WA_WSTI_WD_CRE_MLT_DOC_HEAD-INVNU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSTI_WD_CRE_MLT_DOC_HEAD 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_WSTI_WD_CRE_MLT_DOC_HEAD 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_WSTI_WD_CRE_MLT_DOC_HEAD INTO WA_WSTI_WD_CRE_MLT_DOC_HEAD.


*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.

*Conversion exit ALPHA, internal->external for field IBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_WD_CRE_MLT_DOC_HEAD-IBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_WD_CRE_MLT_DOC_HEAD-IBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WSTI_WD_CRE_MLT_DOC_HEAD-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSTI_WD_CRE_MLT_DOC_HEAD-GJAHR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WSTI_WD_CRE_MLT_DOC_HEAD_STR, 
TEMP_NO TYPE STRING,
IBLNR TYPE STRING,
GJAHR TYPE STRING,
LGORT TYPE STRING,
LGOBE TYPE STRING,
SOBKZ TYPE STRING,
SOTXT TYPE STRING,
GIDAT TYPE STRING,
MATKL TYPE STRING,
WGBEZ TYPE STRING,
INVNU TYPE STRING,
IBLTXT TYPE STRING,
NUMBER_OF_ITEMS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSTI_WD_CRE_MLT_DOC_HEAD_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_WSTI_WD_CRE_MLT_DOC_HEAD_STR-TEMP_NO sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-IBLNR sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-GJAHR sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-LGORT sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-LGOBE sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-SOBKZ sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-SOTXT sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-GIDAT sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-MATKL sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-WGBEZ sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-INVNU sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-IBLTXT sy-vline 
WA_WSTI_WD_CRE_MLT_DOC_HEAD_STR-NUMBER_OF_ITEMS sy-vline      INTO ld_text SEPARATED BY SPACE.

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