ABAP Select data from SAP table ISDORESERVATNB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISDORESERVATNB
*  INTO TABLE @DATA(IT_ISDORESERVATNB2).
*--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_ISDORESERVATNB INDEX 1 INTO DATA(WA_ISDORESERVATNB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISDORESERVATNB>-MANDT = 1.
<ISDORESERVATNB>-PURCHASINGDOCUMENT = 1.
<ISDORESERVATNB>-PURCHASINGDOCUMENTITEM = 1.
<ISDORESERVATNB>-OPENDEMANDQUANTITY = 1.
<ISDORESERVATNB>-REQUIREMENTDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISDORESERVATNB-REQUIREMENTSEGMENT, sy-vline,
  WA_ISDORESERVATNB-MATERIAL, sy-vline,
  WA_ISDORESERVATNB-PLANT, sy-vline,
  WA_ISDORESERVATNB-STORAGELOCATION, sy-vline,
  WA_ISDORESERVATNB-REQUIREMENTTYPE, sy-vline,
  WA_ISDORESERVATNB-BATCH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISDORESERVATNB 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_ISDORESERVATNB 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_ISDORESERVATNB INTO WA_ISDORESERVATNB.


*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 PURCHASINGDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISDORESERVATNB-PURCHASINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISDORESERVATNB-PURCHASINGDOCUMENT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field BASEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ISDORESERVATNB-BASEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISDORESERVATNB-BASEUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORDERID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISDORESERVATNB-ORDERID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISDORESERVATNB-ORDERID.
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_ISDORESERVATNB_STR, 
MANDT TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
PURCHASINGDOCUMENTITEM TYPE STRING,
OPENDEMANDQUANTITY TYPE STRING,
REQUIREMENTDATE TYPE STRING,
REQUIREMENTSEGMENT TYPE STRING,
MATERIAL TYPE STRING,
PLANT TYPE STRING,
STORAGELOCATION TYPE STRING,
REQUIREMENTTYPE TYPE STRING,
BATCH TYPE STRING,
BASEUNIT TYPE STRING,
ORDERITEMQTYTOBASEQTYNMRTR TYPE STRING,
ORDERITEMQTYTOBASEQTYDNMNTR TYPE STRING,
REQUIREMENTDOCUMENTNUMBER TYPE STRING,
REQUIREMENTDOCUMENTITEM TYPE STRING,
ORDERID TYPE STRING,
REQUESTEDDATE TYPE STRING,
PRODUCTAVAILABILITYDATE TYPE STRING,
STOCKSEGMENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISDORESERVATNB_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_ISDORESERVATNB_STR-MANDT sy-vline 
WA_ISDORESERVATNB_STR-PURCHASINGDOCUMENT sy-vline 
WA_ISDORESERVATNB_STR-PURCHASINGDOCUMENTITEM sy-vline 
WA_ISDORESERVATNB_STR-OPENDEMANDQUANTITY sy-vline 
WA_ISDORESERVATNB_STR-REQUIREMENTDATE sy-vline 
WA_ISDORESERVATNB_STR-REQUIREMENTSEGMENT sy-vline 
WA_ISDORESERVATNB_STR-MATERIAL sy-vline 
WA_ISDORESERVATNB_STR-PLANT sy-vline 
WA_ISDORESERVATNB_STR-STORAGELOCATION sy-vline 
WA_ISDORESERVATNB_STR-REQUIREMENTTYPE sy-vline 
WA_ISDORESERVATNB_STR-BATCH sy-vline 
WA_ISDORESERVATNB_STR-BASEUNIT sy-vline 
WA_ISDORESERVATNB_STR-ORDERITEMQTYTOBASEQTYNMRTR sy-vline 
WA_ISDORESERVATNB_STR-ORDERITEMQTYTOBASEQTYDNMNTR sy-vline 
WA_ISDORESERVATNB_STR-REQUIREMENTDOCUMENTNUMBER sy-vline 
WA_ISDORESERVATNB_STR-REQUIREMENTDOCUMENTITEM sy-vline 
WA_ISDORESERVATNB_STR-ORDERID sy-vline 
WA_ISDORESERVATNB_STR-REQUESTEDDATE sy-vline 
WA_ISDORESERVATNB_STR-PRODUCTAVAILABILITYDATE sy-vline 
WA_ISDORESERVATNB_STR-STOCKSEGMENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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