ABAP Select data from SAP table ALPERFDC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALPERFDC
*  INTO TABLE @DATA(IT_ALPERFDC2).
*--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_ALPERFDC INDEX 1 INTO DATA(WA_ALPERFDC2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALPERFDC-RECTYPE, sy-vline,
  WA_ALPERFDC-AVERAGEFOR, sy-vline,
  WA_ALPERFDC-FIRSTDAY, sy-vline,
  WA_ALPERFDC-LASTDAY, sy-vline,
  WA_ALPERFDC-STATUSFLAG, sy-vline,
  WA_ALPERFDC-DATAFORMAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALPERFDC 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_ALPERFDC 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_ALPERFDC INTO WA_ALPERFDC.


*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_ALPERFDC_STR, 
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
RECTYPE TYPE STRING,
AVERAGEFOR TYPE STRING,
FIRSTDAY TYPE STRING,
LASTDAY TYPE STRING,
STATUSFLAG TYPE STRING,
DATAFORMAT TYPE STRING,
LASTCHG TYPE STRING,
DELFLAG TYPE STRING,
OBJNAME TYPE STRING,
ATTRNAME TYPE STRING,
MTETYPE TYPE STRING,
MTESUBTYPE TYPE STRING,
MTECLASS TYPE STRING,
PARENTCL TYPE STRING,
P_MTSYSID TYPE STRING,
P_MTMCNAME TYPE STRING,
P_MTNUMRG TYPE STRING,
P_MTUID TYPE STRING,
P_MTCLASS TYPE STRING,
P_MTINDEX TYPE STRING,
P_EXTINDEX TYPE STRING,
OBREFID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALPERFDC_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_ALPERFDC_STR-MTSYSID sy-vline 
WA_ALPERFDC_STR-MTMCNAME sy-vline 
WA_ALPERFDC_STR-MTNUMRANGE sy-vline 
WA_ALPERFDC_STR-MTUID sy-vline 
WA_ALPERFDC_STR-MTCLASS sy-vline 
WA_ALPERFDC_STR-RECTYPE sy-vline 
WA_ALPERFDC_STR-AVERAGEFOR sy-vline 
WA_ALPERFDC_STR-FIRSTDAY sy-vline 
WA_ALPERFDC_STR-LASTDAY sy-vline 
WA_ALPERFDC_STR-STATUSFLAG sy-vline 
WA_ALPERFDC_STR-DATAFORMAT sy-vline 
WA_ALPERFDC_STR-LASTCHG sy-vline 
WA_ALPERFDC_STR-DELFLAG sy-vline 
WA_ALPERFDC_STR-OBJNAME sy-vline 
WA_ALPERFDC_STR-ATTRNAME sy-vline 
WA_ALPERFDC_STR-MTETYPE sy-vline 
WA_ALPERFDC_STR-MTESUBTYPE sy-vline 
WA_ALPERFDC_STR-MTECLASS sy-vline 
WA_ALPERFDC_STR-PARENTCL sy-vline 
WA_ALPERFDC_STR-P_MTSYSID sy-vline 
WA_ALPERFDC_STR-P_MTMCNAME sy-vline 
WA_ALPERFDC_STR-P_MTNUMRG sy-vline 
WA_ALPERFDC_STR-P_MTUID sy-vline 
WA_ALPERFDC_STR-P_MTCLASS sy-vline 
WA_ALPERFDC_STR-P_MTINDEX sy-vline 
WA_ALPERFDC_STR-P_EXTINDEX sy-vline 
WA_ALPERFDC_STR-OBREFID sy-vline      INTO ld_text SEPARATED BY SPACE.

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