ABAP Select data from SAP table IPVWELL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IPVWELL
*  INTO TABLE @DATA(IT_IPVWELL2).
*--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_IPVWELL INDEX 1 INTO DATA(WA_IPVWELL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IPVWELL>-MANDT = 1.
<IPVWELL>-WELL = 1.
<IPVWELL>-WELLNAME = 1.
<IPVWELL>-APIWELLNUMBER = 1.
<IPVWELL>-LATITUDEUNIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IPVWELL-LONGITUDEUNIT, sy-vline,
  WA_IPVWELL-WELLLATITUDE, sy-vline,
  WA_IPVWELL-WELLLATITUDEDIRECTION, sy-vline,
  WA_IPVWELL-WELLLONGITUDE, sy-vline,
  WA_IPVWELL-WELLLONGITUDEDIRECTION, sy-vline,
  WA_IPVWELL-CREATEDBYUSER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IPVWELL 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_IPVWELL 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_IPVWELL INTO WA_IPVWELL.


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

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

*Conversion exit CUNIT, internal->external for field LONGITUDEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IPVWELL-LONGITUDEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IPVWELL-LONGITUDEUNIT.
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_IPVWELL_STR, 
MANDT TYPE STRING,
WELL TYPE STRING,
WELLNAME TYPE STRING,
APIWELLNUMBER TYPE STRING,
LATITUDEUNIT TYPE STRING,
LONGITUDEUNIT TYPE STRING,
WELLLATITUDE TYPE STRING,
WELLLATITUDEDIRECTION TYPE STRING,
WELLLONGITUDE TYPE STRING,
WELLLONGITUDEDIRECTION TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IPVWELL_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_IPVWELL_STR-MANDT sy-vline 
WA_IPVWELL_STR-WELL sy-vline 
WA_IPVWELL_STR-WELLNAME sy-vline 
WA_IPVWELL_STR-APIWELLNUMBER sy-vline 
WA_IPVWELL_STR-LATITUDEUNIT sy-vline 
WA_IPVWELL_STR-LONGITUDEUNIT sy-vline 
WA_IPVWELL_STR-WELLLATITUDE sy-vline 
WA_IPVWELL_STR-WELLLATITUDEDIRECTION sy-vline 
WA_IPVWELL_STR-WELLLONGITUDE sy-vline 
WA_IPVWELL_STR-WELLLONGITUDEDIRECTION sy-vline 
WA_IPVWELL_STR-CREATEDBYUSER sy-vline 
WA_IPVWELL_STR-CREATIONDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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