ABAP Select data from SAP table A4CD 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 A4CD 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 A4CD. 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 A4CD 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_A4CD TYPE STANDARD TABLE OF A4CD,
      WA_A4CD TYPE A4CD,
      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: <A4CD> TYPE A4CD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_A4CD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM A4CD
  INTO TABLE IT_A4CD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM A4CD
*  INTO TABLE @DATA(IT_A4CD2).
*--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_A4CD INDEX 1 INTO DATA(WA_A4CD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_A4CD ASSIGNING <A4CD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<A4CD>-MANDT = 1.
<A4CD>-KAPPL = 1.
<A4CD>-KSCHL = 1.
<A4CD>-VKORG = 1.
<A4CD>-VTWEG = 1.

ENDLOOP.

LOOP AT IT_A4CD INTO WA_A4CD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_A4CD-UPMAT, sy-vline,
  WA_A4CD-MATNR, sy-vline,
  WA_A4CD-PROV_DURATION, sy-vline,
  WA_A4CD-PROV_DURAT_UNIT, sy-vline,
  WA_A4CD-KFRST, sy-vline,
  WA_A4CD-DATBI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_A4CD 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_A4CD 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_A4CD INTO WA_A4CD.


*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 MATN1, internal->external for field UPMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_A4CD-UPMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_A4CD-UPMAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_A4CD-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_A4CD-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_A4CD_STR, 
MANDT TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
UPMAT TYPE STRING,
MATNR TYPE STRING,
PROV_DURATION TYPE STRING,
PROV_DURAT_UNIT TYPE STRING,
KFRST TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
KBSTAT TYPE STRING,
KNUMH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_A4CD_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_A4CD_STR-MANDT sy-vline 
WA_A4CD_STR-KAPPL sy-vline 
WA_A4CD_STR-KSCHL sy-vline 
WA_A4CD_STR-VKORG sy-vline 
WA_A4CD_STR-VTWEG sy-vline 
WA_A4CD_STR-UPMAT sy-vline 
WA_A4CD_STR-MATNR sy-vline 
WA_A4CD_STR-PROV_DURATION sy-vline 
WA_A4CD_STR-PROV_DURAT_UNIT sy-vline 
WA_A4CD_STR-KFRST sy-vline 
WA_A4CD_STR-DATBI sy-vline 
WA_A4CD_STR-DATAB sy-vline 
WA_A4CD_STR-KBSTAT sy-vline 
WA_A4CD_STR-KNUMH sy-vline      INTO ld_text SEPARATED BY SPACE.

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