ABAP Select data from SAP table P1789_EXP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P1789_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 P1789_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 P1789_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_P1789_EXP TYPE STANDARD TABLE OF P1789_EXP,
      WA_P1789_EXP TYPE P1789_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: <P1789_EXP> TYPE P1789_EXP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P1789_EXP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P1789_EXP
  INTO TABLE IT_P1789_EXP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P1789_EXP
*  INTO TABLE @DATA(IT_P1789_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_P1789_EXP INDEX 1 INTO DATA(WA_P1789_EXP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P1789_EXP ASSIGNING <P1789_EXP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P1789_EXP>-MANDT = 1.
<P1789_EXP>-PLVAR = 1.
<P1789_EXP>-OTYPE = 1.
<P1789_EXP>-OBJID = 1.
<P1789_EXP>-INFTY = 1.

ENDLOOP.

LOOP AT IT_P1789_EXP INTO WA_P1789_EXP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P1789_EXP-SUBTY, sy-vline,
  WA_P1789_EXP-ISTAT, sy-vline,
  WA_P1789_EXP-PRIOX, sy-vline,
  WA_P1789_EXP-BEGDA, sy-vline,
  WA_P1789_EXP-ENDDA, sy-vline,
  WA_P1789_EXP-VARYF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P1789_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_P1789_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_P1789_EXP INTO WA_P1789_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_P1789_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,
PERYR TYPE STRING,
PERID TYPE STRING,
PERYR_FIRST TYPE STRING,
PERID_FIRST TYPE STRING,
HEI TYPE STRING,
GDRSEM TYPE STRING,
GDRSEM_STUDTYP TYPE STRING,
PREPSEM TYPE STRING,
UNIVERSITYSEM TYPE STRING,
LEAVEOFABSSEM TYPE STRING,
INTERNSHIPSEM TYPE STRING,
CLINICSEM TYPE STRING,
WORK_QUAL TYPE STRING,
WORK_STUDY TYPE STRING,
INTERRUPTSEM_PREV TYPE STRING,
HEI_COUNTRY TYPE STRING,
INTERRUPT_PROGRAM TYPE STRING,
INTERRUPT_TYPE TYPE STRING,
REF_OTYPE TYPE STRING,
REF_REALO TYPE STRING,
ADM_DATE TYPE STRING,
COHORT_SEM TYPE STRING,
CLINIC_COHSEM TYPE STRING,
CLINIC_SUBSEM TYPE STRING,
TABNR TYPE STRING,
TABSEQNR TYPE STRING,
CSOBJID TYPE STRING,
CGOBJID TYPE STRING,
SUBJECTSEM TYPE STRING,
ACKSEM_DE TYPE STRING,
ACKSEM_EMPL TYPE STRING,
ACKSEM_FRGN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P1789_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_P1789_EXP_STR-MANDT sy-vline 
WA_P1789_EXP_STR-PLVAR sy-vline 
WA_P1789_EXP_STR-OTYPE sy-vline 
WA_P1789_EXP_STR-OBJID sy-vline 
WA_P1789_EXP_STR-INFTY sy-vline 
WA_P1789_EXP_STR-SUBTY sy-vline 
WA_P1789_EXP_STR-ISTAT sy-vline 
WA_P1789_EXP_STR-PRIOX sy-vline 
WA_P1789_EXP_STR-BEGDA sy-vline 
WA_P1789_EXP_STR-ENDDA sy-vline 
WA_P1789_EXP_STR-VARYF sy-vline 
WA_P1789_EXP_STR-SEQNR sy-vline 
WA_P1789_EXP_STR-AEDTM sy-vline 
WA_P1789_EXP_STR-UNAME sy-vline 
WA_P1789_EXP_STR-REASN sy-vline 
WA_P1789_EXP_STR-HISTO sy-vline 
WA_P1789_EXP_STR-ITXNR sy-vline 
WA_P1789_EXP_STR-PERYR sy-vline 
WA_P1789_EXP_STR-PERID sy-vline 
WA_P1789_EXP_STR-PERYR_FIRST sy-vline 
WA_P1789_EXP_STR-PERID_FIRST sy-vline 
WA_P1789_EXP_STR-HEI sy-vline 
WA_P1789_EXP_STR-GDRSEM sy-vline 
WA_P1789_EXP_STR-GDRSEM_STUDTYP sy-vline 
WA_P1789_EXP_STR-PREPSEM sy-vline 
WA_P1789_EXP_STR-UNIVERSITYSEM sy-vline 
WA_P1789_EXP_STR-LEAVEOFABSSEM sy-vline 
WA_P1789_EXP_STR-INTERNSHIPSEM sy-vline 
WA_P1789_EXP_STR-CLINICSEM sy-vline 
WA_P1789_EXP_STR-WORK_QUAL sy-vline 
WA_P1789_EXP_STR-WORK_STUDY sy-vline 
WA_P1789_EXP_STR-INTERRUPTSEM_PREV sy-vline 
WA_P1789_EXP_STR-HEI_COUNTRY sy-vline 
WA_P1789_EXP_STR-INTERRUPT_PROGRAM sy-vline 
WA_P1789_EXP_STR-INTERRUPT_TYPE sy-vline 
WA_P1789_EXP_STR-REF_OTYPE sy-vline 
WA_P1789_EXP_STR-REF_REALO sy-vline 
WA_P1789_EXP_STR-ADM_DATE sy-vline 
WA_P1789_EXP_STR-COHORT_SEM sy-vline 
WA_P1789_EXP_STR-CLINIC_COHSEM sy-vline 
WA_P1789_EXP_STR-CLINIC_SUBSEM sy-vline 
WA_P1789_EXP_STR-TABNR sy-vline 
WA_P1789_EXP_STR-TABSEQNR sy-vline 
WA_P1789_EXP_STR-CSOBJID sy-vline 
WA_P1789_EXP_STR-CGOBJID sy-vline 
WA_P1789_EXP_STR-SUBJECTSEM sy-vline 
WA_P1789_EXP_STR-ACKSEM_DE sy-vline 
WA_P1789_EXP_STR-ACKSEM_EMPL sy-vline 
WA_P1789_EXP_STR-ACKSEM_FRGN sy-vline      INTO ld_text SEPARATED BY SPACE.

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