ABAP Select data from SAP table /PRA/P2_ACC_DOCH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /PRA/P2_ACC_DOCH 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 /PRA/P2_ACC_DOCH. 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 /PRA/P2_ACC_DOCH 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_/PRA/P2_ACC_DOCH TYPE STANDARD TABLE OF /PRA/P2_ACC_DOCH,
      WA_/PRA/P2_ACC_DOCH TYPE /PRA/P2_ACC_DOCH,
      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: </PRA/P2_ACC_DOCH> TYPE /PRA/P2_ACC_DOCH.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/PRA/P2_ACC_DOCH.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /PRA/P2_ACC_DOCH
  INTO TABLE IT_/PRA/P2_ACC_DOCH.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /PRA/P2_ACC_DOCH
*  INTO TABLE @DATA(IT_/PRA/P2_ACC_DOCH2).
*--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_/PRA/P2_ACC_DOCH INDEX 1 INTO DATA(WA_/PRA/P2_ACC_DOCH2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/PRA/P2_ACC_DOCH ASSIGNING </PRA/P2_ACC_DOCH>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</PRA/P2_ACC_DOCH>-MANDT = 1.
</PRA/P2_ACC_DOCH>-RUN_ID = 1.
</PRA/P2_ACC_DOCH>-BUKRS = 1.
</PRA/P2_ACC_DOCH>-ACCT_PERIOD = 1.
</PRA/P2_ACC_DOCH>-DOC_NO = 1.

ENDLOOP.

LOOP AT IT_/PRA/P2_ACC_DOCH INTO WA_/PRA/P2_ACC_DOCH.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/PRA/P2_ACC_DOCH-DOC_TYPE, sy-vline,
  WA_/PRA/P2_ACC_DOCH-REF_KEY, sy-vline,
  WA_/PRA/P2_ACC_DOCH-SYSTEM_SRC, sy-vline,
  WA_/PRA/P2_ACC_DOCH-DEBIT_AMT, sy-vline,
  WA_/PRA/P2_ACC_DOCH-CREDIT_AMT, sy-vline,
  WA_/PRA/P2_ACC_DOCH-STAT_AMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/PRA/P2_ACC_DOCH 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_/PRA/P2_ACC_DOCH 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_/PRA/P2_ACC_DOCH INTO WA_/PRA/P2_ACC_DOCH.


*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 OIUMY, internal->external for field ACCT_PERIOD
CALL FUNCTION 'CONVERSION_EXIT_OIUMY_OUTPUT'
  EXPORTING
    input =                      WA_/PRA/P2_ACC_DOCH-ACCT_PERIOD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/PRA/P2_ACC_DOCH-ACCT_PERIOD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOC_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/PRA/P2_ACC_DOCH-DOC_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/PRA/P2_ACC_DOCH-DOC_NO.
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_/PRA/P2_ACC_DOCH_STR, 
MANDT TYPE STRING,
RUN_ID TYPE STRING,
BUKRS TYPE STRING,
ACCT_PERIOD TYPE STRING,
DOC_NO TYPE STRING,
DOC_TYPE TYPE STRING,
REF_KEY TYPE STRING,
SYSTEM_SRC TYPE STRING,
DEBIT_AMT TYPE STRING,
CREDIT_AMT TYPE STRING,
STAT_AMT TYPE STRING,
DOC_STATUS TYPE STRING,
RVRS_DOC_FL TYPE STRING,
XCC_KEY TYPE STRING,
TOTAL_REC_CNT TYPE STRING,
REJ_REC_CNT TYPE STRING,
POST_DT TYPE STRING,
DOC_DT TYPE STRING,
DOCUMENT_DESC TYPE STRING,
OIU_CRUSER TYPE STRING,
OIU_TIMESTAMP TYPE STRING,
CHANGE_USER TYPE STRING,
CHANGE_TIMESTAMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/PRA/P2_ACC_DOCH_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_/PRA/P2_ACC_DOCH_STR-MANDT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-RUN_ID sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-BUKRS sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-ACCT_PERIOD sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-DOC_NO sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-DOC_TYPE sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-REF_KEY sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-SYSTEM_SRC sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-DEBIT_AMT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-CREDIT_AMT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-STAT_AMT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-DOC_STATUS sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-RVRS_DOC_FL sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-XCC_KEY sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-TOTAL_REC_CNT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-REJ_REC_CNT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-POST_DT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-DOC_DT sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-DOCUMENT_DESC sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-OIU_CRUSER sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-OIU_TIMESTAMP sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-CHANGE_USER sy-vline 
WA_/PRA/P2_ACC_DOCH_STR-CHANGE_TIMESTAMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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