ABAP Select data from SAP table P1891_EXP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P1891_EXP 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 P1891_EXP. 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 P1891_EXP 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_P1891_EXP TYPE STANDARD TABLE OF P1891_EXP,
      WA_P1891_EXP TYPE P1891_EXP,
      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: <P1891_EXP> TYPE P1891_EXP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P1891_EXP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P1891_EXP
  INTO TABLE IT_P1891_EXP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P1891_EXP
*  INTO TABLE @DATA(IT_P1891_EXP2).
*--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_P1891_EXP INDEX 1 INTO DATA(WA_P1891_EXP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P1891_EXP ASSIGNING <P1891_EXP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P1891_EXP>-MANDT = 1.
<P1891_EXP>-PLVAR = 1.
<P1891_EXP>-OTYPE = 1.
<P1891_EXP>-OBJID = 1.
<P1891_EXP>-INFTY = 1.

ENDLOOP.

LOOP AT IT_P1891_EXP INTO WA_P1891_EXP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P1891_EXP-SUBTY, sy-vline,
  WA_P1891_EXP-ISTAT, sy-vline,
  WA_P1891_EXP-PRIOX, sy-vline,
  WA_P1891_EXP-BEGDA, sy-vline,
  WA_P1891_EXP-ENDDA, sy-vline,
  WA_P1891_EXP-VARYF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P1891_EXP 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_P1891_EXP 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_P1891_EXP INTO WA_P1891_EXP.


*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_P1891_EXP_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,
SC_OBJID TYPE STRING,
ADM_AYEAR TYPE STRING,
ADM_PERID TYPE STRING,
BRINNUMBER TYPE STRING,
BRINSEQUENCE TYPE STRING,
LOCATION TYPE STRING,
ENROLLFORMCODE TYPE STRING,
ENROLLMOMENTCODE TYPE STRING,
FIRSTYEAR TYPE STRING,
COMPREQSTATUS TYPE STRING,
ACTIVITIESSTATUS TYPE STRING,
LANGTEST TYPE STRING,
LOTTERYDRAW TYPE STRING,
LOTTERY TYPE STRING,
LOTTERYSEQUENCE TYPE STRING,
IBGSTATUS TYPE STRING,
PLACEISSUEDATE TYPE STRING,
LOTTERYRESULT TYPE STRING,
REASONFORRESEVE TYPE STRING,
REASONFORREJECT TYPE STRING,
REASONFORTERMIN TYPE STRING,
INTERVIEW TYPE STRING,
MOTIVATION TYPE STRING,
EXPERIENCE TYPE STRING,
INTERNATIONALEXP TYPE STRING,
WORKEXP TYPE STRING,
OTHER TYPE STRING,
OTHERTEXT TYPE STRING,
DELAYEDENROLL TYPE STRING,
ENROLLHIGHYEAR TYPE STRING,
DEFRAYMENTCODE TYPE STRING,
DEFICIENCYSTATUS TYPE STRING,
REQFORRESTIT TYPE STRING,
FULLTPARTT TYPE STRING,
ENRSTARTDATE TYPE STRING,
EDUPHASECODE TYPE STRING,
FIRSTYEARACC TYPE STRING,
UNENDESDATE TYPE STRING,
MSG34SENT TYPE STRING,
REQUESTGRANTED TYPE STRING,
ADM_GUID TYPE STRING,
DEREG_DECDATE TYPE STRING,
REGNUM TYPE STRING,
REGNUM_OLD TYPE STRING,
STUDYCHOICE_IND TYPE STRING,
APPL_DEADLINE TYPE STRING,
FAPPL_DATE TYPE STRING,
REGNUM_DUO TYPE STRING,
STUDY_SWITCH TYPE STRING,
WLIST_IND TYPE STRING,
WSTATUS TYPE STRING,
TABNR TYPE STRING,
TABSEQNR TYPE STRING,
LINENR TYPE STRING,
FREETEXTLINE TYPE STRING,
TEXTTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P1891_EXP_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_P1891_EXP_STR-MANDT sy-vline 
WA_P1891_EXP_STR-PLVAR sy-vline 
WA_P1891_EXP_STR-OTYPE sy-vline 
WA_P1891_EXP_STR-OBJID sy-vline 
WA_P1891_EXP_STR-INFTY sy-vline 
WA_P1891_EXP_STR-SUBTY sy-vline 
WA_P1891_EXP_STR-ISTAT sy-vline 
WA_P1891_EXP_STR-PRIOX sy-vline 
WA_P1891_EXP_STR-BEGDA sy-vline 
WA_P1891_EXP_STR-ENDDA sy-vline 
WA_P1891_EXP_STR-VARYF sy-vline 
WA_P1891_EXP_STR-SEQNR sy-vline 
WA_P1891_EXP_STR-AEDTM sy-vline 
WA_P1891_EXP_STR-UNAME sy-vline 
WA_P1891_EXP_STR-REASN sy-vline 
WA_P1891_EXP_STR-HISTO sy-vline 
WA_P1891_EXP_STR-ITXNR sy-vline 
WA_P1891_EXP_STR-SC_OBJID sy-vline 
WA_P1891_EXP_STR-ADM_AYEAR sy-vline 
WA_P1891_EXP_STR-ADM_PERID sy-vline 
WA_P1891_EXP_STR-BRINNUMBER sy-vline 
WA_P1891_EXP_STR-BRINSEQUENCE sy-vline 
WA_P1891_EXP_STR-LOCATION sy-vline 
WA_P1891_EXP_STR-ENROLLFORMCODE sy-vline 
WA_P1891_EXP_STR-ENROLLMOMENTCODE sy-vline 
WA_P1891_EXP_STR-FIRSTYEAR sy-vline 
WA_P1891_EXP_STR-COMPREQSTATUS sy-vline 
WA_P1891_EXP_STR-ACTIVITIESSTATUS sy-vline 
WA_P1891_EXP_STR-LANGTEST sy-vline 
WA_P1891_EXP_STR-LOTTERYDRAW sy-vline 
WA_P1891_EXP_STR-LOTTERY sy-vline 
WA_P1891_EXP_STR-LOTTERYSEQUENCE sy-vline 
WA_P1891_EXP_STR-IBGSTATUS sy-vline 
WA_P1891_EXP_STR-PLACEISSUEDATE sy-vline 
WA_P1891_EXP_STR-LOTTERYRESULT sy-vline 
WA_P1891_EXP_STR-REASONFORRESEVE sy-vline 
WA_P1891_EXP_STR-REASONFORREJECT sy-vline 
WA_P1891_EXP_STR-REASONFORTERMIN sy-vline 
WA_P1891_EXP_STR-INTERVIEW sy-vline 
WA_P1891_EXP_STR-MOTIVATION sy-vline 
WA_P1891_EXP_STR-EXPERIENCE sy-vline 
WA_P1891_EXP_STR-INTERNATIONALEXP sy-vline 
WA_P1891_EXP_STR-WORKEXP sy-vline 
WA_P1891_EXP_STR-OTHER sy-vline 
WA_P1891_EXP_STR-OTHERTEXT sy-vline 
WA_P1891_EXP_STR-DELAYEDENROLL sy-vline 
WA_P1891_EXP_STR-ENROLLHIGHYEAR sy-vline 
WA_P1891_EXP_STR-DEFRAYMENTCODE sy-vline 
WA_P1891_EXP_STR-DEFICIENCYSTATUS sy-vline 
WA_P1891_EXP_STR-REQFORRESTIT sy-vline 
WA_P1891_EXP_STR-FULLTPARTT sy-vline 
WA_P1891_EXP_STR-ENRSTARTDATE sy-vline 
WA_P1891_EXP_STR-EDUPHASECODE sy-vline 
WA_P1891_EXP_STR-FIRSTYEARACC sy-vline 
WA_P1891_EXP_STR-UNENDESDATE sy-vline 
WA_P1891_EXP_STR-MSG34SENT sy-vline 
WA_P1891_EXP_STR-REQUESTGRANTED sy-vline 
WA_P1891_EXP_STR-ADM_GUID sy-vline 
WA_P1891_EXP_STR-DEREG_DECDATE sy-vline 
WA_P1891_EXP_STR-REGNUM sy-vline 
WA_P1891_EXP_STR-REGNUM_OLD sy-vline 
WA_P1891_EXP_STR-STUDYCHOICE_IND sy-vline 
WA_P1891_EXP_STR-APPL_DEADLINE sy-vline 
WA_P1891_EXP_STR-FAPPL_DATE sy-vline 
WA_P1891_EXP_STR-REGNUM_DUO sy-vline 
WA_P1891_EXP_STR-STUDY_SWITCH sy-vline 
WA_P1891_EXP_STR-WLIST_IND sy-vline 
WA_P1891_EXP_STR-WSTATUS sy-vline 
WA_P1891_EXP_STR-TABNR sy-vline 
WA_P1891_EXP_STR-TABSEQNR sy-vline 
WA_P1891_EXP_STR-LINENR sy-vline 
WA_P1891_EXP_STR-FREETEXTLINE sy-vline 
WA_P1891_EXP_STR-TEXTTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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