ABAP Select data from SAP table VZLOG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VZLOG
*  INTO TABLE @DATA(IT_VZLOG2).
*--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_VZLOG INDEX 1 INTO DATA(WA_VZLOG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VZLOG>-MANDT = 1.
<VZLOG>-RELID = 1.
<VZLOG>-PARKEY = 1.
<VZLOG>-PARNAME1 = 1.
<VZLOG>-PARNAME2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VZLOG-PARNAME3, sy-vline,
  WA_VZLOG-UNAME, sy-vline,
  WA_VZLOG-DATUM, sy-vline,
  WA_VZLOG-UZEIT, sy-vline,
  WA_VZLOG-VBELN, sy-vline,
  WA_VZLOG-VBTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VZLOG 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_VZLOG 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_VZLOG INTO WA_VZLOG.


*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 VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VZLOG-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VZLOG-VBELN.
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_VZLOG_STR, 
MANDT TYPE STRING,
RELID TYPE STRING,
PARKEY TYPE STRING,
PARNAME1 TYPE STRING,
PARNAME2 TYPE STRING,
PARNAME3 TYPE STRING,
UNAME TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
VBELN TYPE STRING,
VBTYP TYPE STRING,
TCODE TYPE STRING,
TABNAME TYPE STRING,
GUID TYPE STRING,
SRTF2 TYPE STRING,
CLUSTR TYPE STRING,
CLUSTD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VZLOG_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_VZLOG_STR-MANDT sy-vline 
WA_VZLOG_STR-RELID sy-vline 
WA_VZLOG_STR-PARKEY sy-vline 
WA_VZLOG_STR-PARNAME1 sy-vline 
WA_VZLOG_STR-PARNAME2 sy-vline 
WA_VZLOG_STR-PARNAME3 sy-vline 
WA_VZLOG_STR-UNAME sy-vline 
WA_VZLOG_STR-DATUM sy-vline 
WA_VZLOG_STR-UZEIT sy-vline 
WA_VZLOG_STR-VBELN sy-vline 
WA_VZLOG_STR-VBTYP sy-vline 
WA_VZLOG_STR-TCODE sy-vline 
WA_VZLOG_STR-TABNAME sy-vline 
WA_VZLOG_STR-GUID sy-vline 
WA_VZLOG_STR-SRTF2 sy-vline 
WA_VZLOG_STR-CLUSTR sy-vline 
WA_VZLOG_STR-CLUSTD sy-vline      INTO ld_text SEPARATED BY SPACE.

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