ABAP Select data from SAP table IST_EXT_POS_MVALV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IST_EXT_POS_MVALV
*  INTO TABLE @DATA(IT_IST_EXT_POS_MVALV2).
*--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_IST_EXT_POS_MVALV INDEX 1 INTO DATA(WA_IST_EXT_POS_MVALV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IST_EXT_POS_MVALV>-CLIENT = 1.
<IST_EXT_POS_MVALV>-FRG_GUID = 1.
<IST_EXT_POS_MVALV>-VALID_FROM = 1.
<IST_EXT_POS_MVALV>-VALID_TO = 1.
<IST_EXT_POS_MVALV>-UPNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IST_EXT_POS_MVALV-HISTEX, sy-vline,
  WA_IST_EXT_POS_MVALV-LOGSYS, sy-vline,
  WA_IST_EXT_POS_MVALV-ILGUID, sy-vline,
  WA_IST_EXT_POS_MVALV-EXTREF, sy-vline,
  WA_IST_EXT_POS_MVALV-SCORE, sy-vline,
  WA_IST_EXT_POS_MVALV-PROCESS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IST_EXT_POS_MVALV 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_IST_EXT_POS_MVALV 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_IST_EXT_POS_MVALV INTO WA_IST_EXT_POS_MVALV.


*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 TSTPS, internal->external for field VALID_FROM
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_IST_EXT_POS_MVALV-VALID_FROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IST_EXT_POS_MVALV-VALID_FROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTPS, internal->external for field VALID_TO
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_IST_EXT_POS_MVALV-VALID_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IST_EXT_POS_MVALV-VALID_TO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IST_EXT_POS_MVALV-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IST_EXT_POS_MVALV-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EXTREF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IST_EXT_POS_MVALV-EXTREF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IST_EXT_POS_MVALV-EXTREF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ORDER, internal->external for field ORDER_GUID
CALL FUNCTION 'CONVERSION_EXIT_ORDER_OUTPUT'
  EXPORTING
    input =                      WA_IST_EXT_POS_MVALV-ORDER_GUID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IST_EXT_POS_MVALV-ORDER_GUID.
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_IST_EXT_POS_MVALV_STR, 
CLIENT TYPE STRING,
FRG_GUID TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
UPNAME TYPE STRING,
HISTEX TYPE STRING,
LOGSYS TYPE STRING,
ILGUID TYPE STRING,
EXTREF TYPE STRING,
SCORE TYPE STRING,
PROCESS TYPE STRING,
SELTYPE TYPE STRING,
PRCPROC TYPE STRING,
PROC_ID TYPE STRING,
SCGROUP TYPE STRING,
SERVTYP TYPE STRING,
LOCKRSN TYPE STRING,
SCAUTH TYPE STRING,
SCDOCID TYPE STRING,
ORDER_GUID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IST_EXT_POS_MVALV_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_IST_EXT_POS_MVALV_STR-CLIENT sy-vline 
WA_IST_EXT_POS_MVALV_STR-FRG_GUID sy-vline 
WA_IST_EXT_POS_MVALV_STR-VALID_FROM sy-vline 
WA_IST_EXT_POS_MVALV_STR-VALID_TO sy-vline 
WA_IST_EXT_POS_MVALV_STR-UPNAME sy-vline 
WA_IST_EXT_POS_MVALV_STR-HISTEX sy-vline 
WA_IST_EXT_POS_MVALV_STR-LOGSYS sy-vline 
WA_IST_EXT_POS_MVALV_STR-ILGUID sy-vline 
WA_IST_EXT_POS_MVALV_STR-EXTREF sy-vline 
WA_IST_EXT_POS_MVALV_STR-SCORE sy-vline 
WA_IST_EXT_POS_MVALV_STR-PROCESS sy-vline 
WA_IST_EXT_POS_MVALV_STR-SELTYPE sy-vline 
WA_IST_EXT_POS_MVALV_STR-PRCPROC sy-vline 
WA_IST_EXT_POS_MVALV_STR-PROC_ID sy-vline 
WA_IST_EXT_POS_MVALV_STR-SCGROUP sy-vline 
WA_IST_EXT_POS_MVALV_STR-SERVTYP sy-vline 
WA_IST_EXT_POS_MVALV_STR-LOCKRSN sy-vline 
WA_IST_EXT_POS_MVALV_STR-SCAUTH sy-vline 
WA_IST_EXT_POS_MVALV_STR-SCDOCID sy-vline 
WA_IST_EXT_POS_MVALV_STR-ORDER_GUID sy-vline      INTO ld_text SEPARATED BY SPACE.

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