ABAP Select data from SAP table ERZU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ERZU
*  INTO TABLE @DATA(IT_ERZU2).
*--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_ERZU INDEX 1 INTO DATA(WA_ERZU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ERZU>-MANDT = 1.
<ERZU>-PLOBJ = 1.
<ERZU>-STFNA = 1.
<ERZU>-ERNMR = 1.
<ERZU>-RELDA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ERZU-VRSIO, sy-vline,
  WA_ERZU-SSOUR, sy-vline,
  WA_ERZU-RELST, sy-vline,
  WA_ERZU-REVLU, sy-vline,
  WA_ERZU-GSTRU, sy-vline,
  WA_ERZU-RFERE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ERZU 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_ERZU 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_ERZU INTO WA_ERZU.


*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_ERZU_STR, 
MANDT TYPE STRING,
PLOBJ TYPE STRING,
STFNA TYPE STRING,
ERNMR TYPE STRING,
RELDA TYPE STRING,
VRSIO TYPE STRING,
SSOUR TYPE STRING,
RELST TYPE STRING,
REVLU TYPE STRING,
GSTRU TYPE STRING,
RFERE TYPE STRING,
DECIM TYPE STRING,
EXPON TYPE STRING,
CDAT TYPE STRING,
CTIME TYPE STRING,
AUTOR TYPE STRING,
UDAT TYPE STRING,
UPNAM TYPE STRING,
UTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ERZU_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_ERZU_STR-MANDT sy-vline 
WA_ERZU_STR-PLOBJ sy-vline 
WA_ERZU_STR-STFNA sy-vline 
WA_ERZU_STR-ERNMR sy-vline 
WA_ERZU_STR-RELDA sy-vline 
WA_ERZU_STR-VRSIO sy-vline 
WA_ERZU_STR-SSOUR sy-vline 
WA_ERZU_STR-RELST sy-vline 
WA_ERZU_STR-REVLU sy-vline 
WA_ERZU_STR-GSTRU sy-vline 
WA_ERZU_STR-RFERE sy-vline 
WA_ERZU_STR-DECIM sy-vline 
WA_ERZU_STR-EXPON sy-vline 
WA_ERZU_STR-CDAT sy-vline 
WA_ERZU_STR-CTIME sy-vline 
WA_ERZU_STR-AUTOR sy-vline 
WA_ERZU_STR-UDAT sy-vline 
WA_ERZU_STR-UPNAM sy-vline 
WA_ERZU_STR-UTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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