ABAP Select data from SAP table P2B2_AB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2B2_AB 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 P2B2_AB. 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 P2B2_AB 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_P2B2_AB TYPE STANDARD TABLE OF P2B2_AB,
      WA_P2B2_AB TYPE P2B2_AB,
      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: <P2B2_AB> TYPE P2B2_AB.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2B2_AB.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2B2_AB
  INTO TABLE IT_P2B2_AB.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2B2_AB
*  INTO TABLE @DATA(IT_P2B2_AB2).
*--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_P2B2_AB INDEX 1 INTO DATA(WA_P2B2_AB2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2B2_AB ASSIGNING <P2B2_AB>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2B2_AB>-MANDT = 1.
<P2B2_AB>-DCT_PERNR = 1.
<P2B2_AB>-DCT_PABRJ = 1.
<P2B2_AB>-DCT_PABRP = 1.
<P2B2_AB>-DCT_CLTYP = 1.

ENDLOOP.

LOOP AT IT_P2B2_AB INTO WA_P2B2_AB.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2B2_AB-DCT_ROWID, sy-vline,
  WA_P2B2_AB-ABZNR, sy-vline,
  WA_P2B2_AB-ABART, sy-vline,
  WA_P2B2_AB-APZNR, sy-vline,
  WA_P2B2_AB-CNTR1, sy-vline,
  WA_P2B2_AB-CNTR2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2B2_AB 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_P2B2_AB 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_P2B2_AB INTO WA_P2B2_AB.


*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 GJAHR, internal->external for field DCT_PABRJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_P2B2_AB-DCT_PABRJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P2B2_AB-DCT_PABRJ.
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_P2B2_AB_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_PABRJ TYPE STRING,
DCT_PABRP TYPE STRING,
DCT_CLTYP TYPE STRING,
DCT_ROWID TYPE STRING,
ABZNR TYPE STRING,
ABART TYPE STRING,
APZNR TYPE STRING,
CNTR1 TYPE STRING,
CNTR2 TYPE STRING,
CNTR3 TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
VTKEN TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
AWART TYPE STRING,
ABWTG TYPE STRING,
STDAZ TYPE STRING,
ABRTG TYPE STRING,
ABRST TYPE STRING,
KALTG TYPE STRING,
KENN1 TYPE STRING,
KENN2 TYPE STRING,
KLBEW TYPE STRING,
PSARB TYPE STRING,
OBEGD TYPE STRING,
OENDD TYPE STRING,
REFEX TYPE STRING,
ORDEX TYPE STRING,
SUBTY TYPE STRING,
OBJPS TYPE STRING,
SPRPS TYPE STRING,
SEQNR TYPE STRING,
ALLDF TYPE STRING,
HRSIF TYPE STRING,
OCABS TYPE STRING,
DOCNR TYPE STRING,
ALZNR TYPE STRING,
NXDFL TYPE STRING,
START_BEF_ZERO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2B2_AB_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_P2B2_AB_STR-MANDT sy-vline 
WA_P2B2_AB_STR-DCT_PERNR sy-vline 
WA_P2B2_AB_STR-DCT_PABRJ sy-vline 
WA_P2B2_AB_STR-DCT_PABRP sy-vline 
WA_P2B2_AB_STR-DCT_CLTYP sy-vline 
WA_P2B2_AB_STR-DCT_ROWID sy-vline 
WA_P2B2_AB_STR-ABZNR sy-vline 
WA_P2B2_AB_STR-ABART sy-vline 
WA_P2B2_AB_STR-APZNR sy-vline 
WA_P2B2_AB_STR-CNTR1 sy-vline 
WA_P2B2_AB_STR-CNTR2 sy-vline 
WA_P2B2_AB_STR-CNTR3 sy-vline 
WA_P2B2_AB_STR-ENDDA sy-vline 
WA_P2B2_AB_STR-BEGDA sy-vline 
WA_P2B2_AB_STR-VTKEN sy-vline 
WA_P2B2_AB_STR-BEGUZ sy-vline 
WA_P2B2_AB_STR-ENDUZ sy-vline 
WA_P2B2_AB_STR-AWART sy-vline 
WA_P2B2_AB_STR-ABWTG sy-vline 
WA_P2B2_AB_STR-STDAZ sy-vline 
WA_P2B2_AB_STR-ABRTG sy-vline 
WA_P2B2_AB_STR-ABRST sy-vline 
WA_P2B2_AB_STR-KALTG sy-vline 
WA_P2B2_AB_STR-KENN1 sy-vline 
WA_P2B2_AB_STR-KENN2 sy-vline 
WA_P2B2_AB_STR-KLBEW sy-vline 
WA_P2B2_AB_STR-PSARB sy-vline 
WA_P2B2_AB_STR-OBEGD sy-vline 
WA_P2B2_AB_STR-OENDD sy-vline 
WA_P2B2_AB_STR-REFEX sy-vline 
WA_P2B2_AB_STR-ORDEX sy-vline 
WA_P2B2_AB_STR-SUBTY sy-vline 
WA_P2B2_AB_STR-OBJPS sy-vline 
WA_P2B2_AB_STR-SPRPS sy-vline 
WA_P2B2_AB_STR-SEQNR sy-vline 
WA_P2B2_AB_STR-ALLDF sy-vline 
WA_P2B2_AB_STR-HRSIF sy-vline 
WA_P2B2_AB_STR-OCABS sy-vline 
WA_P2B2_AB_STR-DOCNR sy-vline 
WA_P2B2_AB_STR-ALZNR sy-vline 
WA_P2B2_AB_STR-NXDFL sy-vline 
WA_P2B2_AB_STR-START_BEF_ZERO sy-vline      INTO ld_text SEPARATED BY SPACE.

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