ABAP Select data from SAP table PSHLP_CACHE_DB_N into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSHLP_CACHE_DB_N
*  INTO TABLE @DATA(IT_PSHLP_CACHE_DB_N2).
*--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_PSHLP_CACHE_DB_N INDEX 1 INTO DATA(WA_PSHLP_CACHE_DB_N2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSHLP_CACHE_DB_N>-MANDT = 1.
<PSHLP_CACHE_DB_N>-OBJNR = 1.
<PSHLP_CACHE_DB_N>-PROJECT = 1.
<PSHLP_CACHE_DB_N>-IND_NTWK = 1.
<PSHLP_CACHE_DB_N>-OBJECT_TYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSHLP_CACHE_DB_N-NTWK, sy-vline,
  WA_PSHLP_CACHE_DB_N-WBS, sy-vline,
  WA_PSHLP_CACHE_DB_N-ACTY, sy-vline,
  WA_PSHLP_CACHE_DB_N-MLST, sy-vline,
  WA_PSHLP_CACHE_DB_N-LOAD_DATE, sy-vline,
  WA_PSHLP_CACHE_DB_N-EXPIRY_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSHLP_CACHE_DB_N 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_PSHLP_CACHE_DB_N 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_PSHLP_CACHE_DB_N INTO WA_PSHLP_CACHE_DB_N.


*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 ABPSN, internal->external for field PROJECT
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_PSHLP_CACHE_DB_N-PROJECT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSHLP_CACHE_DB_N-PROJECT.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ABPSN, internal->external for field WBS
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_PSHLP_CACHE_DB_N-WBS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSHLP_CACHE_DB_N-WBS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field ACTY
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PSHLP_CACHE_DB_N-ACTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSHLP_CACHE_DB_N-ACTY.
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_PSHLP_CACHE_DB_N_STR, 
MANDT TYPE STRING,
OBJNR TYPE STRING,
PROJECT TYPE STRING,
IND_NTWK TYPE STRING,
OBJECT_TYPE TYPE STRING,
NTWK TYPE STRING,
WBS TYPE STRING,
ACTY TYPE STRING,
MLST TYPE STRING,
LOAD_DATE TYPE STRING,
EXPIRY_DATE TYPE STRING,
CHANGE_TYPE TYPE STRING,
USERNAME TYPE STRING,
HIERARCHY TYPE STRING,
MASTERDATA TYPE STRING,
STATUS TYPE STRING,
STATUS_PROFILE TYPE STRING,
ACL TYPE STRING,
SHORTTEXT TYPE STRING,
ACTY_RELATIONS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSHLP_CACHE_DB_N_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_PSHLP_CACHE_DB_N_STR-MANDT sy-vline 
WA_PSHLP_CACHE_DB_N_STR-OBJNR sy-vline 
WA_PSHLP_CACHE_DB_N_STR-PROJECT sy-vline 
WA_PSHLP_CACHE_DB_N_STR-IND_NTWK sy-vline 
WA_PSHLP_CACHE_DB_N_STR-OBJECT_TYPE sy-vline 
WA_PSHLP_CACHE_DB_N_STR-NTWK sy-vline 
WA_PSHLP_CACHE_DB_N_STR-WBS sy-vline 
WA_PSHLP_CACHE_DB_N_STR-ACTY sy-vline 
WA_PSHLP_CACHE_DB_N_STR-MLST sy-vline 
WA_PSHLP_CACHE_DB_N_STR-LOAD_DATE sy-vline 
WA_PSHLP_CACHE_DB_N_STR-EXPIRY_DATE sy-vline 
WA_PSHLP_CACHE_DB_N_STR-CHANGE_TYPE sy-vline 
WA_PSHLP_CACHE_DB_N_STR-USERNAME sy-vline 
WA_PSHLP_CACHE_DB_N_STR-HIERARCHY sy-vline 
WA_PSHLP_CACHE_DB_N_STR-MASTERDATA sy-vline 
WA_PSHLP_CACHE_DB_N_STR-STATUS sy-vline 
WA_PSHLP_CACHE_DB_N_STR-STATUS_PROFILE sy-vline 
WA_PSHLP_CACHE_DB_N_STR-ACL sy-vline 
WA_PSHLP_CACHE_DB_N_STR-SHORTTEXT sy-vline 
WA_PSHLP_CACHE_DB_N_STR-ACTY_RELATIONS sy-vline      INTO ld_text SEPARATED BY SPACE.

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