ABAP Select data from SAP table ISU2A_ZW into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ISU2A_ZW 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 ISU2A_ZW. 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 ISU2A_ZW 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_ISU2A_ZW TYPE STANDARD TABLE OF ISU2A_ZW,
      WA_ISU2A_ZW TYPE ISU2A_ZW,
      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: <ISU2A_ZW> TYPE ISU2A_ZW.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ISU2A_ZW.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ISU2A_ZW
  INTO TABLE IT_ISU2A_ZW.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISU2A_ZW
*  INTO TABLE @DATA(IT_ISU2A_ZW2).
*--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_ISU2A_ZW INDEX 1 INTO DATA(WA_ISU2A_ZW2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ISU2A_ZW ASSIGNING <ISU2A_ZW>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISU2A_ZW>-LOGIKZW = 1.
<ISU2A_ZW>-AB = 1.
<ISU2A_ZW>-BIS = 1.
<ISU2A_ZW>-EQUNR = 1.
<ISU2A_ZW>-ZWNUMMER = 1.

ENDLOOP.

LOOP AT IT_ISU2A_ZW INTO WA_ISU2A_ZW.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISU2A_ZW-ZWTYP, sy-vline,
  WA_ISU2A_ZW-ZWNABR, sy-vline,
  WA_ISU2A_ZW-LOGIKNR, sy-vline,
  WA_ISU2A_ZW-TARIFART, sy-vline,
  WA_ISU2A_ZW-KONDIGR, sy-vline,
  WA_ISU2A_ZW-THGVER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISU2A_ZW 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_ISU2A_ZW 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_ISU2A_ZW INTO WA_ISU2A_ZW.


*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 EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISU2A_ZW-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISU2A_ZW-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSREAD
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ISU2A_ZW-MASSREAD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISU2A_ZW-MASSREAD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field GERAET
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_ISU2A_ZW-GERAET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISU2A_ZW-GERAET.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PREISKLA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISU2A_ZW-PREISKLA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISU2A_ZW-PREISKLA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RABZUS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISU2A_ZW-RABZUS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISU2A_ZW-RABZUS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ISU2A_ZW-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISU2A_ZW-MATNR.
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_ISU2A_ZW_STR, 
LOGIKZW TYPE STRING,
AB TYPE STRING,
BIS TYPE STRING,
EQUNR TYPE STRING,
ZWNUMMER TYPE STRING,
ZWTYP TYPE STRING,
ZWNABR TYPE STRING,
LOGIKNR TYPE STRING,
TARIFART TYPE STRING,
KONDIGR TYPE STRING,
THGVER TYPE STRING,
MESSDRCK TYPE STRING,
FESTTEMP TYPE STRING,
KZAHLE TYPE STRING,
KZAHLT TYPE STRING,
GASFACTOR TYPE STRING,
ABRFAKT TYPE STRING,
ZWFAKT TYPE STRING,
STANZVOR TYPE STRING,
MASSREAD TYPE STRING,
PROPROZ TYPE STRING,
PROFEST TYPE STRING,
ZEITRAUM TYPE STRING,
GERAET TYPE STRING,
SPARTYP TYPE STRING,
TEMP_AREA TYPE STRING,
PR_AREA_AI TYPE STRING,
CALOR_AREA TYPE STRING,
HOEKORR TYPE STRING,
GAS_PRS_AR TYPE STRING,
CRGPRESS TYPE STRING,
PREISKLA TYPE STRING,
GVERRECH TYPE STRING,
RABZUS TYPE STRING,
BLIWIRK TYPE STRING,
MAIN_REG TYPE STRING,
SEC_REG TYPE STRING,
MATNR TYPE STRING,
PERTYP TYPE STRING,
BACKNO TYPE STRING,
INTSIZEID TYPE STRING,
QD_PROC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISU2A_ZW_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_ISU2A_ZW_STR-LOGIKZW sy-vline 
WA_ISU2A_ZW_STR-AB sy-vline 
WA_ISU2A_ZW_STR-BIS sy-vline 
WA_ISU2A_ZW_STR-EQUNR sy-vline 
WA_ISU2A_ZW_STR-ZWNUMMER sy-vline 
WA_ISU2A_ZW_STR-ZWTYP sy-vline 
WA_ISU2A_ZW_STR-ZWNABR sy-vline 
WA_ISU2A_ZW_STR-LOGIKNR sy-vline 
WA_ISU2A_ZW_STR-TARIFART sy-vline 
WA_ISU2A_ZW_STR-KONDIGR sy-vline 
WA_ISU2A_ZW_STR-THGVER sy-vline 
WA_ISU2A_ZW_STR-MESSDRCK sy-vline 
WA_ISU2A_ZW_STR-FESTTEMP sy-vline 
WA_ISU2A_ZW_STR-KZAHLE sy-vline 
WA_ISU2A_ZW_STR-KZAHLT sy-vline 
WA_ISU2A_ZW_STR-GASFACTOR sy-vline 
WA_ISU2A_ZW_STR-ABRFAKT sy-vline 
WA_ISU2A_ZW_STR-ZWFAKT sy-vline 
WA_ISU2A_ZW_STR-STANZVOR sy-vline 
WA_ISU2A_ZW_STR-MASSREAD sy-vline 
WA_ISU2A_ZW_STR-PROPROZ sy-vline 
WA_ISU2A_ZW_STR-PROFEST sy-vline 
WA_ISU2A_ZW_STR-ZEITRAUM sy-vline 
WA_ISU2A_ZW_STR-GERAET sy-vline 
WA_ISU2A_ZW_STR-SPARTYP sy-vline 
WA_ISU2A_ZW_STR-TEMP_AREA sy-vline 
WA_ISU2A_ZW_STR-PR_AREA_AI sy-vline 
WA_ISU2A_ZW_STR-CALOR_AREA sy-vline 
WA_ISU2A_ZW_STR-HOEKORR sy-vline 
WA_ISU2A_ZW_STR-GAS_PRS_AR sy-vline 
WA_ISU2A_ZW_STR-CRGPRESS sy-vline 
WA_ISU2A_ZW_STR-PREISKLA sy-vline 
WA_ISU2A_ZW_STR-GVERRECH sy-vline 
WA_ISU2A_ZW_STR-RABZUS sy-vline 
WA_ISU2A_ZW_STR-BLIWIRK sy-vline 
WA_ISU2A_ZW_STR-MAIN_REG sy-vline 
WA_ISU2A_ZW_STR-SEC_REG sy-vline 
WA_ISU2A_ZW_STR-MATNR sy-vline 
WA_ISU2A_ZW_STR-PERTYP sy-vline 
WA_ISU2A_ZW_STR-BACKNO sy-vline 
WA_ISU2A_ZW_STR-INTSIZEID sy-vline 
WA_ISU2A_ZW_STR-QD_PROC sy-vline      INTO ld_text SEPARATED BY SPACE.

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