ABAP Select data from SAP table ESH_U_OBJECTLINK 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_OBJECTLINK 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_OBJECTLINK. 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_OBJECTLINK 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_OBJECTLINK TYPE STANDARD TABLE OF ESH_U_OBJECTLINK,
      WA_ESH_U_OBJECTLINK TYPE ESH_U_OBJECTLINK,
      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_OBJECTLINK> TYPE ESH_U_OBJECTLINK.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESH_U_OBJECTLINK
*  INTO TABLE @DATA(IT_ESH_U_OBJECTLINK2).
*--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_OBJECTLINK INDEX 1 INTO DATA(WA_ESH_U_OBJECTLINK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESH_U_OBJECTLINK>-MANDT = 1.
<ESH_U_OBJECTLINK>-OBJECTNETWORK = 1.
<ESH_U_OBJECTLINK>-OBJECTLINKISEQUIPORFUNCNLLOC = 1.
<ESH_U_OBJECTLINK>-OBJLINKFROMFUNCTIONALLOCATION = 1.
<ESH_U_OBJECTLINK>-OBJECTLINKFROMEQUIPMENT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESH_U_OBJECTLINK-OBJECTLINKTOFUNCTIONALLOCATION, sy-vline,
  WA_ESH_U_OBJECTLINK-OBJECTLINKTOEQUIPMENT, sy-vline,
  WA_ESH_U_OBJECTLINK-OBJECTLINKVALIDITYSTARTDATE, sy-vline,
  WA_ESH_U_OBJECTLINK-OBJECTLINKVALIDITYENDDATE, sy-vline,
  WA_ESH_U_OBJECTLINK-OBJECTLINKISFUNCTIONALLOCATION, sy-vline,
  WA_ESH_U_OBJECTLINK-OBJECTLINKMEDIUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESH_U_OBJECTLINK 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_OBJECTLINK 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_OBJECTLINK INTO WA_ESH_U_OBJECTLINK.


*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 TPLNR, internal->external for field OBJLINKFROMFUNCTIONALLOCATION
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_OBJECTLINK-OBJLINKFROMFUNCTIONALLOCATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_OBJECTLINK-OBJLINKFROMFUNCTIONALLOCATION.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TPLNR, internal->external for field OBJECTLINKTOFUNCTIONALLOCATION
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_OBJECTLINK-OBJECTLINKTOFUNCTIONALLOCATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_OBJECTLINK-OBJECTLINKTOFUNCTIONALLOCATION.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TPLNR, internal->external for field OBJECTLINKISFUNCTIONALLOCATION
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_OBJECTLINK-OBJECTLINKISFUNCTIONALLOCATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_OBJECTLINK-OBJECTLINKISFUNCTIONALLOCATION.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field OBJECTLINK
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_OBJECTLINK-OBJECTLINK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_OBJECTLINK-OBJECTLINK.
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_OBJECTLINK_STR, 
MANDT TYPE STRING,
OBJECTNETWORK TYPE STRING,
OBJECTLINKISEQUIPORFUNCNLLOC TYPE STRING,
OBJLINKFROMFUNCTIONALLOCATION TYPE STRING,
OBJECTLINKFROMEQUIPMENT TYPE STRING,
OBJECTLINKTOFUNCTIONALLOCATION TYPE STRING,
OBJECTLINKTOEQUIPMENT TYPE STRING,
OBJECTLINKVALIDITYSTARTDATE TYPE STRING,
OBJECTLINKVALIDITYENDDATE TYPE STRING,
OBJECTLINKISFUNCTIONALLOCATION TYPE STRING,
OBJECTLINKMEDIUM TYPE STRING,
OBJECTLINKISEQUIPMENT TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
OBJECTLINKCATEGORY TYPE STRING,
PRODUCT TYPE STRING,
PLAINLONGTEXT TYPE STRING,
DESCRIPTIONLINKFREQUI TYPE STRING,
DESCRIPTIONLINKFRFLOC TYPE STRING,
OBJECTLINKDESCRIPTION TYPE STRING,
DESCRIPTIONLINKTOEQUI TYPE STRING,
FUNCTIONALLOCATIONNAME TYPE STRING,
PRODUCTNAME TYPE STRING,
OBJECTLINK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESH_U_OBJECTLINK_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_OBJECTLINK_STR-MANDT sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTNETWORK sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKISEQUIPORFUNCNLLOC sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJLINKFROMFUNCTIONALLOCATION sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKFROMEQUIPMENT sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKTOFUNCTIONALLOCATION sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKTOEQUIPMENT sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKVALIDITYSTARTDATE sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKVALIDITYENDDATE sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKISFUNCTIONALLOCATION sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKMEDIUM sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKISEQUIPMENT sy-vline 
WA_ESH_U_OBJECTLINK_STR-AUTHORIZATIONGROUP sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKCATEGORY sy-vline 
WA_ESH_U_OBJECTLINK_STR-PRODUCT sy-vline 
WA_ESH_U_OBJECTLINK_STR-PLAINLONGTEXT sy-vline 
WA_ESH_U_OBJECTLINK_STR-DESCRIPTIONLINKFREQUI sy-vline 
WA_ESH_U_OBJECTLINK_STR-DESCRIPTIONLINKFRFLOC sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINKDESCRIPTION sy-vline 
WA_ESH_U_OBJECTLINK_STR-DESCRIPTIONLINKTOEQUI sy-vline 
WA_ESH_U_OBJECTLINK_STR-FUNCTIONALLOCATIONNAME sy-vline 
WA_ESH_U_OBJECTLINK_STR-PRODUCTNAME sy-vline 
WA_ESH_U_OBJECTLINK_STR-OBJECTLINK sy-vline      INTO ld_text SEPARATED BY SPACE.

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