ABAP Select data from SAP table ESH_U_RESVNDOC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESH_U_RESVNDOC
*  INTO TABLE @DATA(IT_ESH_U_RESVNDOC2).
*--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_ESH_U_RESVNDOC INDEX 1 INTO DATA(WA_ESH_U_RESVNDOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESH_U_RESVNDOC>-MANDT = 1.
<ESH_U_RESVNDOC>-ASSETNUMBER = 1.
<ESH_U_RESVNDOC>-SUPPLIERAUTHORIZATIONGROUP = 1.
<ESH_U_RESVNDOC>-SUPPLIERBYPLNTAUTHORIZATIONGRP = 1.
<ESH_U_RESVNDOC>-COSTCENTER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESH_U_RESVNDOC-DEBITCREDITCODE, sy-vline,
  WA_ESH_U_RESVNDOC-DEBITCREDITCODENAME, sy-vline,
  WA_ESH_U_RESVNDOC-GOODSMOVEMENTTYPE, sy-vline,
  WA_ESH_U_RESVNDOC-GOODSMOVEMENTTYPENAME, sy-vline,
  WA_ESH_U_RESVNDOC-GOODSRECIPIENTNAME, sy-vline,
  WA_ESH_U_RESVNDOC-ISSUINGORRECEIVINGPLANT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESH_U_RESVNDOC 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_ESH_U_RESVNDOC 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_ESH_U_RESVNDOC INTO WA_ESH_U_RESVNDOC.


*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 ALPHA, internal->external for field ASSETNUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_RESVNDOC-ASSETNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_RESVNDOC-ASSETNUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field COSTCENTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_RESVNDOC-COSTCENTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_RESVNDOC-COSTCENTER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MATERIALDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_RESVNDOC-MATERIALDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_RESVNDOC-MATERIALDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NETWORKNUMBERFORACCTASSGMT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_RESVNDOC-NETWORKNUMBERFORACCTASSGMT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_RESVNDOC-NETWORKNUMBERFORACCTASSGMT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORDERID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_RESVNDOC-ORDERID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_RESVNDOC-ORDERID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field PRODUCT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_RESVNDOC-PRODUCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_RESVNDOC-PRODUCT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SALESORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_RESVNDOC-SALESORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_RESVNDOC-SALESORDER.
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_ESH_U_RESVNDOC_STR, 
MANDT TYPE STRING,
ASSETNUMBER TYPE STRING,
SUPPLIERAUTHORIZATIONGROUP TYPE STRING,
SUPPLIERBYPLNTAUTHORIZATIONGRP TYPE STRING,
COSTCENTER TYPE STRING,
DEBITCREDITCODE TYPE STRING,
DEBITCREDITCODENAME TYPE STRING,
GOODSMOVEMENTTYPE TYPE STRING,
GOODSMOVEMENTTYPENAME TYPE STRING,
GOODSRECIPIENTNAME TYPE STRING,
ISSUINGORRECEIVINGPLANT TYPE STRING,
ISSUINGORRECEIVINGSTORAGELOC TYPE STRING,
MATERIALDOCUMENT TYPE STRING,
NETWORKNUMBERFORACCTASSGMT TYPE STRING,
ORDERID TYPE STRING,
PLANT TYPE STRING,
PLANTNAME TYPE STRING,
RECEIVINGPLANTNAME TYPE STRING,
PRODUCT TYPE STRING,
PRODUCTNAME TYPE STRING,
REQUIREMENTTYPE TYPE STRING,
RESERVATION TYPE STRING,
RESERVATIONDATE TYPE STRING,
RESERVATIONITEMISFINALLYISSUED TYPE STRING,
RESERVATIONITMISMARKEDFORDELTN TYPE STRING,
RESVNACCTASSGMTCATEGORY TYPE STRING,
RESVNACCTASSGMTCATEGORYNAME TYPE STRING,
SALESORDER TYPE STRING,
STORAGELOCATION TYPE STRING,
STORAGELOCATIONNAME TYPE STRING,
RECEIVINGSTORAGELOCNAME TYPE STRING,
USERDESCRIPTION TYPE STRING,
WBSELEMENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESH_U_RESVNDOC_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_ESH_U_RESVNDOC_STR-MANDT sy-vline 
WA_ESH_U_RESVNDOC_STR-ASSETNUMBER sy-vline 
WA_ESH_U_RESVNDOC_STR-SUPPLIERAUTHORIZATIONGROUP sy-vline 
WA_ESH_U_RESVNDOC_STR-SUPPLIERBYPLNTAUTHORIZATIONGRP sy-vline 
WA_ESH_U_RESVNDOC_STR-COSTCENTER sy-vline 
WA_ESH_U_RESVNDOC_STR-DEBITCREDITCODE sy-vline 
WA_ESH_U_RESVNDOC_STR-DEBITCREDITCODENAME sy-vline 
WA_ESH_U_RESVNDOC_STR-GOODSMOVEMENTTYPE sy-vline 
WA_ESH_U_RESVNDOC_STR-GOODSMOVEMENTTYPENAME sy-vline 
WA_ESH_U_RESVNDOC_STR-GOODSRECIPIENTNAME sy-vline 
WA_ESH_U_RESVNDOC_STR-ISSUINGORRECEIVINGPLANT sy-vline 
WA_ESH_U_RESVNDOC_STR-ISSUINGORRECEIVINGSTORAGELOC sy-vline 
WA_ESH_U_RESVNDOC_STR-MATERIALDOCUMENT sy-vline 
WA_ESH_U_RESVNDOC_STR-NETWORKNUMBERFORACCTASSGMT sy-vline 
WA_ESH_U_RESVNDOC_STR-ORDERID sy-vline 
WA_ESH_U_RESVNDOC_STR-PLANT sy-vline 
WA_ESH_U_RESVNDOC_STR-PLANTNAME sy-vline 
WA_ESH_U_RESVNDOC_STR-RECEIVINGPLANTNAME sy-vline 
WA_ESH_U_RESVNDOC_STR-PRODUCT sy-vline 
WA_ESH_U_RESVNDOC_STR-PRODUCTNAME sy-vline 
WA_ESH_U_RESVNDOC_STR-REQUIREMENTTYPE sy-vline 
WA_ESH_U_RESVNDOC_STR-RESERVATION sy-vline 
WA_ESH_U_RESVNDOC_STR-RESERVATIONDATE sy-vline 
WA_ESH_U_RESVNDOC_STR-RESERVATIONITEMISFINALLYISSUED sy-vline 
WA_ESH_U_RESVNDOC_STR-RESERVATIONITMISMARKEDFORDELTN sy-vline 
WA_ESH_U_RESVNDOC_STR-RESVNACCTASSGMTCATEGORY sy-vline 
WA_ESH_U_RESVNDOC_STR-RESVNACCTASSGMTCATEGORYNAME sy-vline 
WA_ESH_U_RESVNDOC_STR-SALESORDER sy-vline 
WA_ESH_U_RESVNDOC_STR-STORAGELOCATION sy-vline 
WA_ESH_U_RESVNDOC_STR-STORAGELOCATIONNAME sy-vline 
WA_ESH_U_RESVNDOC_STR-RECEIVINGSTORAGELOCNAME sy-vline 
WA_ESH_U_RESVNDOC_STR-USERDESCRIPTION sy-vline 
WA_ESH_U_RESVNDOC_STR-WBSELEMENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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