ABAP Select data from SAP table REG30_ZW_C_A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP REG30_ZW_C_A 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 REG30_ZW_C_A. 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 REG30_ZW_C_A 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_REG30_ZW_C_A TYPE STANDARD TABLE OF REG30_ZW_C_A,
      WA_REG30_ZW_C_A TYPE REG30_ZW_C_A,
      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: <REG30_ZW_C_A> TYPE REG30_ZW_C_A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_REG30_ZW_C_A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM REG30_ZW_C_A
  INTO TABLE IT_REG30_ZW_C_A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REG30_ZW_C_A
*  INTO TABLE @DATA(IT_REG30_ZW_C_A2).
*--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_REG30_ZW_C_A INDEX 1 INTO DATA(WA_REG30_ZW_C_A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_REG30_ZW_C_A ASSIGNING <REG30_ZW_C_A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REG30_ZW_C_A>-STEUERGRPA = 1.
<REG30_ZW_C_A>-UEBERVERA = 1.
<REG30_ZW_C_A>-THGBERA = 1.
<REG30_ZW_C_A>-GERAETA = 1.
<REG30_ZW_C_A>-EQUNRA = 1.

ENDLOOP.

LOOP AT IT_REG30_ZW_C_A INTO WA_REG30_ZW_C_A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REG30_ZW_C_A-MATNRA, sy-vline,
  WA_REG30_ZW_C_A-PROGTA, sy-vline,
  WA_REG30_ZW_C_A-ABRFAKTA, sy-vline,
  WA_REG30_ZW_C_A-LOGIKZWA, sy-vline,
  WA_REG30_ZW_C_A-FESTTEMPA, sy-vline,
  WA_REG30_ZW_C_A-PREISKLAA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_REG30_ZW_C_A 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_REG30_ZW_C_A 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_REG30_ZW_C_A INTO WA_REG30_ZW_C_A.


*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 GERNR, internal->external for field GERAETA
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_C_A-GERAETA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_C_A-GERAETA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNRA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_C_A-EQUNRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_C_A-EQUNRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNRA
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_C_A-MATNRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_C_A-MATNRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PREISKLAA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_C_A-PREISKLAA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_C_A-PREISKLAA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSBILLA
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_C_A-MASSBILLA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_C_A-MASSBILLA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MASSREADA
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_REG30_ZW_C_A-MASSREADA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REG30_ZW_C_A-MASSREADA.
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_REG30_ZW_C_A_STR, 
STEUERGRPA TYPE STRING,
UEBERVERA TYPE STRING,
THGBERA TYPE STRING,
GERAETA TYPE STRING,
EQUNRA TYPE STRING,
MATNRA TYPE STRING,
PROGTA TYPE STRING,
ABRFAKTA TYPE STRING,
LOGIKZWA TYPE STRING,
FESTTEMPA TYPE STRING,
PREISKLAA TYPE STRING,
METERDOCA TYPE STRING,
NABLESENA TYPE STRING,
MASSBILLA TYPE STRING,
GEWKEYA TYPE STRING,
INTSIZEIDA TYPE STRING,
PRUEFKLA TYPE STRING,
TOUPERIODA TYPE STRING,
MASSREADA TYPE STRING,
VEE_CODEA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REG30_ZW_C_A_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_REG30_ZW_C_A_STR-STEUERGRPA sy-vline 
WA_REG30_ZW_C_A_STR-UEBERVERA sy-vline 
WA_REG30_ZW_C_A_STR-THGBERA sy-vline 
WA_REG30_ZW_C_A_STR-GERAETA sy-vline 
WA_REG30_ZW_C_A_STR-EQUNRA sy-vline 
WA_REG30_ZW_C_A_STR-MATNRA sy-vline 
WA_REG30_ZW_C_A_STR-PROGTA sy-vline 
WA_REG30_ZW_C_A_STR-ABRFAKTA sy-vline 
WA_REG30_ZW_C_A_STR-LOGIKZWA sy-vline 
WA_REG30_ZW_C_A_STR-FESTTEMPA sy-vline 
WA_REG30_ZW_C_A_STR-PREISKLAA sy-vline 
WA_REG30_ZW_C_A_STR-METERDOCA sy-vline 
WA_REG30_ZW_C_A_STR-NABLESENA sy-vline 
WA_REG30_ZW_C_A_STR-MASSBILLA sy-vline 
WA_REG30_ZW_C_A_STR-GEWKEYA sy-vline 
WA_REG30_ZW_C_A_STR-INTSIZEIDA sy-vline 
WA_REG30_ZW_C_A_STR-PRUEFKLA sy-vline 
WA_REG30_ZW_C_A_STR-TOUPERIODA sy-vline 
WA_REG30_ZW_C_A_STR-MASSREADA sy-vline 
WA_REG30_ZW_C_A_STR-VEE_CODEA sy-vline      INTO ld_text SEPARATED BY SPACE.

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