ABAP Select data from SAP table ALPRGENDAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALPRGENDAT
*  INTO TABLE @DATA(IT_ALPRGENDAT2).
*--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_ALPRGENDAT INDEX 1 INTO DATA(WA_ALPRGENDAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALPRGENDAT>-TID = 1.
<ALPRGENDAT>-MTSYSID = 1.
<ALPRGENDAT>-MTMCNAME = 1.
<ALPRGENDAT>-MTNUMRANGE = 1.
<ALPRGENDAT>-MTUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALPRGENDAT-MTCLASS, sy-vline,
  WA_ALPRGENDAT-MTINDEX, sy-vline,
  WA_ALPRGENDAT-EXTINDEX, sy-vline,
  WA_ALPRGENDAT-HIGHALVAL, sy-vline,
  WA_ALPRGENDAT-HIGHALSEV, sy-vline,
  WA_ALPRGENDAT-ALERTDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALPRGENDAT 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_ALPRGENDAT 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_ALPRGENDAT INTO WA_ALPRGENDAT.


*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_ALPRGENDAT_STR, 
TID TYPE STRING,
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
MTINDEX TYPE STRING,
EXTINDEX TYPE STRING,
HIGHALVAL TYPE STRING,
HIGHALSEV TYPE STRING,
ALERTDATE TYPE STRING,
ALERTTIME TYPE STRING,
COUNTOFACT TYPE STRING,
ACTUALVAL TYPE STRING,
ACTUALSEV TYPE STRING,
MTENAME TYPE STRING,
MTESHORTNM TYPE STRING,
MTECLASS TYPE STRING,
MTESUBTYPE TYPE STRING,
TDSTATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALPRGENDAT_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_ALPRGENDAT_STR-TID sy-vline 
WA_ALPRGENDAT_STR-MTSYSID sy-vline 
WA_ALPRGENDAT_STR-MTMCNAME sy-vline 
WA_ALPRGENDAT_STR-MTNUMRANGE sy-vline 
WA_ALPRGENDAT_STR-MTUID sy-vline 
WA_ALPRGENDAT_STR-MTCLASS sy-vline 
WA_ALPRGENDAT_STR-MTINDEX sy-vline 
WA_ALPRGENDAT_STR-EXTINDEX sy-vline 
WA_ALPRGENDAT_STR-HIGHALVAL sy-vline 
WA_ALPRGENDAT_STR-HIGHALSEV sy-vline 
WA_ALPRGENDAT_STR-ALERTDATE sy-vline 
WA_ALPRGENDAT_STR-ALERTTIME sy-vline 
WA_ALPRGENDAT_STR-COUNTOFACT sy-vline 
WA_ALPRGENDAT_STR-ACTUALVAL sy-vline 
WA_ALPRGENDAT_STR-ACTUALSEV sy-vline 
WA_ALPRGENDAT_STR-MTENAME sy-vline 
WA_ALPRGENDAT_STR-MTESHORTNM sy-vline 
WA_ALPRGENDAT_STR-MTECLASS sy-vline 
WA_ALPRGENDAT_STR-MTESUBTYPE sy-vline 
WA_ALPRGENDAT_STR-TDSTATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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