ABAP Select data from SAP table BLPK into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BLPK 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 BLPK. 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 BLPK 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_BLPK TYPE STANDARD TABLE OF BLPK,
      WA_BLPK TYPE BLPK,
      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: <BLPK> TYPE BLPK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BLPK
*  INTO TABLE @DATA(IT_BLPK2).
*--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_BLPK INDEX 1 INTO DATA(WA_BLPK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BLPK>-MANDT = 1.
<BLPK>-PRTNR = 1.
<BLPK>-MATNR = 1.
<BLPK>-WERKS = 1.
<BLPK>-VERID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BLPK-DATUM, sy-vline,
  WA_BLPK-UZEIT, sy-vline,
  WA_BLPK-REPTP, sy-vline,
  WA_BLPK-STORN, sy-vline,
  WA_BLPK-AUFNR, sy-vline,
  WA_BLPK-KDAUF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BLPK 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_BLPK 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_BLPK INTO WA_BLPK.


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

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

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

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

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

*Conversion exit NUMCV, internal->external for field VORNE
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_BLPK-VORNE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BLPK-VORNE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field /CWM/MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_BLPK-/CWM/MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BLPK-/CWM/MEINH.
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_BLPK_STR, 
MANDT TYPE STRING,
PRTNR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
VERID TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
REPTP TYPE STRING,
STORN TYPE STRING,
AUFNR TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
PKNUM TYPE STRING,
PKPOS TYPE STRING,
MENGE TYPE STRING,
BDENR TYPE STRING,
VAART TYPE STRING,
UNAME TYPE STRING,
USR01 TYPE STRING,
SCHIV TYPE STRING,
MEINH TYPE STRING,
VORNE TYPE STRING,
BUDAT TYPE STRING,
WAKZH TYPE STRING,
FLKZH TYPE STRING,
KAPKZH TYPE STRING,
PLCNF TYPE STRING,
OBART TYPE STRING,
OBNUM TYPE STRING,
RSKZG TYPE STRING,
RSNUM TYPE STRING,
PWERK TYPE STRING,
ACHARG TYPE STRING,
/CWM/MENGE TYPE STRING,
/CWM/MEINH TYPE STRING,
AUFLD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BLPK_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_BLPK_STR-MANDT sy-vline 
WA_BLPK_STR-PRTNR sy-vline 
WA_BLPK_STR-MATNR sy-vline 
WA_BLPK_STR-WERKS sy-vline 
WA_BLPK_STR-VERID sy-vline 
WA_BLPK_STR-DATUM sy-vline 
WA_BLPK_STR-UZEIT sy-vline 
WA_BLPK_STR-REPTP sy-vline 
WA_BLPK_STR-STORN sy-vline 
WA_BLPK_STR-AUFNR sy-vline 
WA_BLPK_STR-KDAUF sy-vline 
WA_BLPK_STR-KDPOS sy-vline 
WA_BLPK_STR-PKNUM sy-vline 
WA_BLPK_STR-PKPOS sy-vline 
WA_BLPK_STR-MENGE sy-vline 
WA_BLPK_STR-BDENR sy-vline 
WA_BLPK_STR-VAART sy-vline 
WA_BLPK_STR-UNAME sy-vline 
WA_BLPK_STR-USR01 sy-vline 
WA_BLPK_STR-SCHIV sy-vline 
WA_BLPK_STR-MEINH sy-vline 
WA_BLPK_STR-VORNE sy-vline 
WA_BLPK_STR-BUDAT sy-vline 
WA_BLPK_STR-WAKZH sy-vline 
WA_BLPK_STR-FLKZH sy-vline 
WA_BLPK_STR-KAPKZH sy-vline 
WA_BLPK_STR-PLCNF sy-vline 
WA_BLPK_STR-OBART sy-vline 
WA_BLPK_STR-OBNUM sy-vline 
WA_BLPK_STR-RSKZG sy-vline 
WA_BLPK_STR-RSNUM sy-vline 
WA_BLPK_STR-PWERK sy-vline 
WA_BLPK_STR-ACHARG sy-vline 
WA_BLPK_STR-/CWM/MENGE sy-vline 
WA_BLPK_STR-/CWM/MEINH sy-vline 
WA_BLPK_STR-AUFLD sy-vline      INTO ld_text SEPARATED BY SPACE.

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