ABAP Select data from SAP table RESRVDINVPARAM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RESRVDINVPARAM
*  INTO TABLE @DATA(IT_RESRVDINVPARAM2).
*--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_RESRVDINVPARAM INDEX 1 INTO DATA(WA_RESRVDINVPARAM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RESRVDINVPARAM>-BUKRS = 1.
<RESRVDINVPARAM>-LAND1 = 1.
<RESRVDINVPARAM>-ZLSCH = 1.
<RESRVDINVPARAM>-PRTDATE = 1.
<RESRVDINVPARAM>-INVCOLLECT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RESRVDINVPARAM-INVPERIOD, sy-vline,
  WA_RESRVDINVPARAM-INVALLOPENITEMS, sy-vline,
  WA_RESRVDINVPARAM-INVMINAMOUNT, sy-vline,
  WA_RESRVDINVPARAM-WAERS, sy-vline,
  WA_RESRVDINVPARAM-SPFBKZ, sy-vline,
  WA_RESRVDINVPARAM-PRTNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RESRVDINVPARAM 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_RESRVDINVPARAM 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_RESRVDINVPARAM INTO WA_RESRVDINVPARAM.


*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 SPDEV, internal->external for field PRTNAM
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_RESRVDINVPARAM-PRTNAM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RESRVDINVPARAM-PRTNAM.
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_RESRVDINVPARAM_STR, 
BUKRS TYPE STRING,
LAND1 TYPE STRING,
ZLSCH TYPE STRING,
PRTDATE TYPE STRING,
INVCOLLECT TYPE STRING,
INVPERIOD TYPE STRING,
INVALLOPENITEMS TYPE STRING,
INVMINAMOUNT TYPE STRING,
WAERS TYPE STRING,
SPFBKZ TYPE STRING,
PRTNAM TYPE STRING,
DOCLISTDISP TYPE STRING,
DOCLISTMAX TYPE STRING,
DINVFROM TYPE STRING,
DINVTO TYPE STRING,
PLANACTUAL TYPE STRING,
INVRESTFI TYPE STRING,
KORRVORF TYPE STRING,
INVREPEATRUN TYPE STRING,
INVTEMPNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RESRVDINVPARAM_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_RESRVDINVPARAM_STR-BUKRS sy-vline 
WA_RESRVDINVPARAM_STR-LAND1 sy-vline 
WA_RESRVDINVPARAM_STR-ZLSCH sy-vline 
WA_RESRVDINVPARAM_STR-PRTDATE sy-vline 
WA_RESRVDINVPARAM_STR-INVCOLLECT sy-vline 
WA_RESRVDINVPARAM_STR-INVPERIOD sy-vline 
WA_RESRVDINVPARAM_STR-INVALLOPENITEMS sy-vline 
WA_RESRVDINVPARAM_STR-INVMINAMOUNT sy-vline 
WA_RESRVDINVPARAM_STR-WAERS sy-vline 
WA_RESRVDINVPARAM_STR-SPFBKZ sy-vline 
WA_RESRVDINVPARAM_STR-PRTNAM sy-vline 
WA_RESRVDINVPARAM_STR-DOCLISTDISP sy-vline 
WA_RESRVDINVPARAM_STR-DOCLISTMAX sy-vline 
WA_RESRVDINVPARAM_STR-DINVFROM sy-vline 
WA_RESRVDINVPARAM_STR-DINVTO sy-vline 
WA_RESRVDINVPARAM_STR-PLANACTUAL sy-vline 
WA_RESRVDINVPARAM_STR-INVRESTFI sy-vline 
WA_RESRVDINVPARAM_STR-KORRVORF sy-vline 
WA_RESRVDINVPARAM_STR-INVREPEATRUN sy-vline 
WA_RESRVDINVPARAM_STR-INVTEMPNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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