ABAP Select data from SAP table P1794 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P1794 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 P1794. 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 P1794 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_P1794 TYPE STANDARD TABLE OF P1794,
      WA_P1794 TYPE P1794,
      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: <P1794> TYPE P1794.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P1794.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P1794
  INTO TABLE IT_P1794.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P1794
*  INTO TABLE @DATA(IT_P17942).
*--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_P1794 INDEX 1 INTO DATA(WA_P17942).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P1794 ASSIGNING <P1794>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P1794>-MANDT = 1.
<P1794>-PLVAR = 1.
<P1794>-OTYPE = 1.
<P1794>-OBJID = 1.
<P1794>-INFTY = 1.

ENDLOOP.

LOOP AT IT_P1794 INTO WA_P1794.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P1794-SUBTY, sy-vline,
  WA_P1794-ISTAT, sy-vline,
  WA_P1794-PRIOX, sy-vline,
  WA_P1794-BEGDA, sy-vline,
  WA_P1794-ENDDA, sy-vline,
  WA_P1794-VARYF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P1794 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_P1794 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_P1794 INTO WA_P1794.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_P1794_STR, 
MANDT TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
INFTY TYPE STRING,
SUBTY TYPE STRING,
ISTAT TYPE STRING,
PRIOX TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
VARYF TYPE STRING,
SEQNR TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
REASN TYPE STRING,
HISTO TYPE STRING,
ITXNR TYPE STRING,
CENTRE_ID TYPE STRING,
CENTRE_NAME TYPE STRING,
SCH_STATUS TYPE STRING,
GEN_CODE TYPE STRING,
CENTR_TYP TYPE STRING,
SCH_NTR TYPE STRING,
SCH_TYP TYPE STRING,
OWNR_NIF TYPE STRING,
NIF TYPE STRING,
GRPNG TYPE STRING,
ORDER_NO TYPE STRING,
RULE_DAT TYPE STRING,
PBLCTN_DAT TYPE STRING,
MGZN_TYP TYPE STRING,
DSBLTY_TYP TYPE STRING,
BILINGUAL TYPE STRING,
BRTSH_AGRMNT TYPE STRING,
FSE_CNFNCD TYPE STRING,
MIN_IDENTIFIER TYPE STRING,
NIF_SCH_CNTR TYPE STRING,
OWNR_ENT TYPE STRING,
RANGE_REG TYPE STRING,
TABNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P1794_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_P1794_STR-MANDT sy-vline 
WA_P1794_STR-PLVAR sy-vline 
WA_P1794_STR-OTYPE sy-vline 
WA_P1794_STR-OBJID sy-vline 
WA_P1794_STR-INFTY sy-vline 
WA_P1794_STR-SUBTY sy-vline 
WA_P1794_STR-ISTAT sy-vline 
WA_P1794_STR-PRIOX sy-vline 
WA_P1794_STR-BEGDA sy-vline 
WA_P1794_STR-ENDDA sy-vline 
WA_P1794_STR-VARYF sy-vline 
WA_P1794_STR-SEQNR sy-vline 
WA_P1794_STR-AEDTM sy-vline 
WA_P1794_STR-UNAME sy-vline 
WA_P1794_STR-REASN sy-vline 
WA_P1794_STR-HISTO sy-vline 
WA_P1794_STR-ITXNR sy-vline 
WA_P1794_STR-CENTRE_ID sy-vline 
WA_P1794_STR-CENTRE_NAME sy-vline 
WA_P1794_STR-SCH_STATUS sy-vline 
WA_P1794_STR-GEN_CODE sy-vline 
WA_P1794_STR-CENTR_TYP sy-vline 
WA_P1794_STR-SCH_NTR sy-vline 
WA_P1794_STR-SCH_TYP sy-vline 
WA_P1794_STR-OWNR_NIF sy-vline 
WA_P1794_STR-NIF sy-vline 
WA_P1794_STR-GRPNG sy-vline 
WA_P1794_STR-ORDER_NO sy-vline 
WA_P1794_STR-RULE_DAT sy-vline 
WA_P1794_STR-PBLCTN_DAT sy-vline 
WA_P1794_STR-MGZN_TYP sy-vline 
WA_P1794_STR-DSBLTY_TYP sy-vline 
WA_P1794_STR-BILINGUAL sy-vline 
WA_P1794_STR-BRTSH_AGRMNT sy-vline 
WA_P1794_STR-FSE_CNFNCD sy-vline 
WA_P1794_STR-MIN_IDENTIFIER sy-vline 
WA_P1794_STR-NIF_SCH_CNTR sy-vline 
WA_P1794_STR-OWNR_ENT sy-vline 
WA_P1794_STR-RANGE_REG sy-vline 
WA_P1794_STR-TABNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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