ABAP Select data from SAP table T8PSA_PREPOST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T8PSA_PREPOST 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 T8PSA_PREPOST. 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 T8PSA_PREPOST 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_T8PSA_PREPOST TYPE STANDARD TABLE OF T8PSA_PREPOST,
      WA_T8PSA_PREPOST TYPE T8PSA_PREPOST,
      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: <T8PSA_PREPOST> TYPE T8PSA_PREPOST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T8PSA_PREPOST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T8PSA_PREPOST
  INTO TABLE IT_T8PSA_PREPOST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T8PSA_PREPOST
*  INTO TABLE @DATA(IT_T8PSA_PREPOST2).
*--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_T8PSA_PREPOST INDEX 1 INTO DATA(WA_T8PSA_PREPOST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T8PSA_PREPOST ASSIGNING <T8PSA_PREPOST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T8PSA_PREPOST>-MANDT = 1.
<T8PSA_PREPOST>-RRCTY = 1.
<T8PSA_PREPOST>-RVERS = 1.
<T8PSA_PREPOST>-RBUKRS = 1.
<T8PSA_PREPOST>-RYEAR = 1.

ENDLOOP.

LOOP AT IT_T8PSA_PREPOST INTO WA_T8PSA_PREPOST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T8PSA_PREPOST-DOCNR, sy-vline,
  WA_T8PSA_PREPOST-DOCLN, sy-vline,
  WA_T8PSA_PREPOST-RTCUR, sy-vline,
  WA_T8PSA_PREPOST-RUNIT, sy-vline,
  WA_T8PSA_PREPOST-POPER, sy-vline,
  WA_T8PSA_PREPOST-RPSC_NAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T8PSA_PREPOST 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_T8PSA_PREPOST 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_T8PSA_PREPOST INTO WA_T8PSA_PREPOST.


*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 RVERS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-RVERS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-RVERS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field RYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-RYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-RYEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-DOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-DOCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field RUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-RUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-RUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RJVNAM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-RJVNAM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-RJVNAM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REGROU
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-REGROU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-REGROU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RPARTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-RPARTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-RPARTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SJVNAM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-SJVNAM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-SJVNAM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SEGROU
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-SEGROU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-SEGROU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SPARTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T8PSA_PREPOST-SPARTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T8PSA_PREPOST-SPARTN.
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_T8PSA_PREPOST_STR, 
MANDT TYPE STRING,
RRCTY TYPE STRING,
RVERS TYPE STRING,
RBUKRS TYPE STRING,
RYEAR TYPE STRING,
DOCNR TYPE STRING,
DOCLN TYPE STRING,
RTCUR TYPE STRING,
RUNIT TYPE STRING,
POPER TYPE STRING,
RPSC_NAME TYPE STRING,
RPSC_PRODUCT TYPE STRING,
RJVNAM TYPE STRING,
REGROU TYPE STRING,
RPARTN TYPE STRING,
PSC_CALC_TYPE TYPE STRING,
PSC_PER_COST TYPE STRING,
STATUS TYPE STRING,
SPSC_NAME TYPE STRING,
SPSC_PRODUCT TYPE STRING,
SJVNAM TYPE STRING,
SEGROU TYPE STRING,
SPARTN TYPE STRING,
TSL TYPE STRING,
MSL TYPE STRING,
SGTXT TYPE STRING,
BUDAT TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
USNAM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T8PSA_PREPOST_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_T8PSA_PREPOST_STR-MANDT sy-vline 
WA_T8PSA_PREPOST_STR-RRCTY sy-vline 
WA_T8PSA_PREPOST_STR-RVERS sy-vline 
WA_T8PSA_PREPOST_STR-RBUKRS sy-vline 
WA_T8PSA_PREPOST_STR-RYEAR sy-vline 
WA_T8PSA_PREPOST_STR-DOCNR sy-vline 
WA_T8PSA_PREPOST_STR-DOCLN sy-vline 
WA_T8PSA_PREPOST_STR-RTCUR sy-vline 
WA_T8PSA_PREPOST_STR-RUNIT sy-vline 
WA_T8PSA_PREPOST_STR-POPER sy-vline 
WA_T8PSA_PREPOST_STR-RPSC_NAME sy-vline 
WA_T8PSA_PREPOST_STR-RPSC_PRODUCT sy-vline 
WA_T8PSA_PREPOST_STR-RJVNAM sy-vline 
WA_T8PSA_PREPOST_STR-REGROU sy-vline 
WA_T8PSA_PREPOST_STR-RPARTN sy-vline 
WA_T8PSA_PREPOST_STR-PSC_CALC_TYPE sy-vline 
WA_T8PSA_PREPOST_STR-PSC_PER_COST sy-vline 
WA_T8PSA_PREPOST_STR-STATUS sy-vline 
WA_T8PSA_PREPOST_STR-SPSC_NAME sy-vline 
WA_T8PSA_PREPOST_STR-SPSC_PRODUCT sy-vline 
WA_T8PSA_PREPOST_STR-SJVNAM sy-vline 
WA_T8PSA_PREPOST_STR-SEGROU sy-vline 
WA_T8PSA_PREPOST_STR-SPARTN sy-vline 
WA_T8PSA_PREPOST_STR-TSL sy-vline 
WA_T8PSA_PREPOST_STR-MSL sy-vline 
WA_T8PSA_PREPOST_STR-SGTXT sy-vline 
WA_T8PSA_PREPOST_STR-BUDAT sy-vline 
WA_T8PSA_PREPOST_STR-CPUDT sy-vline 
WA_T8PSA_PREPOST_STR-CPUTM sy-vline 
WA_T8PSA_PREPOST_STR-USNAM sy-vline      INTO ld_text SEPARATED BY SPACE.

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