ABAP Select data from SAP table ISSCHEDULEAGMTSCHEDULELIWD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISSCHEDULEAGMTSCHEDULELIWD
*  INTO TABLE @DATA(IT_ISSCHEDULEAGMTSCHEDULELIWD2).
*--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_ISSCHEDULEAGMTSCHEDULELIWD INDEX 1 INTO DATA(WA_ISSCHEDULEAGMTSCHEDULELIWD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISSCHEDULEAGMTSCHEDULELIWD>-KEY = 1.
<ISSCHEDULEAGMTSCHEDULELIWD>-PARENT_KEY = 1.
<ISSCHEDULEAGMTSCHEDULELIWD>-ROOT_KEY = 1.
<ISSCHEDULEAGMTSCHEDULELIWD>-ACTIVESCHEDULINGAGREEMENT = 1.
<ISSCHEDULEAGMTSCHEDULELIWD>-ACTIVESCHEDGAGRMTITM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISSCHEDULEAGMTSCHEDULELIWD-ACTIVESCHEDULELINE, sy-vline,
  WA_ISSCHEDULEAGMTSCHEDULELIWD-DELIVDATECATEGORY, sy-vline,
  WA_ISSCHEDULEAGMTSCHEDULELIWD-SCHEDULELINEDELIVERYDATE, sy-vline,
  WA_ISSCHEDULEAGMTSCHEDULELIWD-SCHEDLINESTSCDELIVERYDATE, sy-vline,
  WA_ISSCHEDULEAGMTSCHEDULELIWD-SCHEDULELINEDELIVERYTIME, sy-vline,
  WA_ISSCHEDULEAGMTSCHEDULELIWD-SCHEDULELINEORDERQUANTITY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISSCHEDULEAGMTSCHEDULELIWD 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_ISSCHEDULEAGMTSCHEDULELIWD 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_ISSCHEDULEAGMTSCHEDULELIWD INTO WA_ISSCHEDULEAGMTSCHEDULELIWD.


*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 ACTIVESCHEDULINGAGREEMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISSCHEDULEAGMTSCHEDULELIWD-ACTIVESCHEDULINGAGREEMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISSCHEDULEAGMTSCHEDULELIWD-ACTIVESCHEDULINGAGREEMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PURCHASEREQUISITION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISSCHEDULEAGMTSCHEDULELIWD-PURCHASEREQUISITION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISSCHEDULEAGMTSCHEDULELIWD-PURCHASEREQUISITION.
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_ISSCHEDULEAGMTSCHEDULELIWD_STR, 
KEY TYPE STRING,
PARENT_KEY TYPE STRING,
ROOT_KEY TYPE STRING,
ACTIVESCHEDULINGAGREEMENT TYPE STRING,
ACTIVESCHEDGAGRMTITM TYPE STRING,
ACTIVESCHEDULELINE TYPE STRING,
DELIVDATECATEGORY TYPE STRING,
SCHEDULELINEDELIVERYDATE TYPE STRING,
SCHEDLINESTSCDELIVERYDATE TYPE STRING,
SCHEDULELINEDELIVERYTIME TYPE STRING,
SCHEDULELINEORDERQUANTITY TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURCHASEREQUISITIONITEM TYPE STRING,
ROUGHGOODSRECEIPTQTY TYPE STRING,
SCHEDULELINEOPENQUANTITY TYPE STRING,
CUMULATIVESCHEDULEQUANTITY TYPE STRING,
PREVIOUSCUMULATIVEQUANTITY TYPE STRING,
FIRMTRADEZONEINDAYS TYPE STRING,
SCHEDULELINEISFIXED TYPE STRING,
NOOFREMINDERSOFSCHEDULELINE TYPE STRING,
PREVDELIVQTYOFSCHEDULELINE TYPE STRING,
SOURCEOFCREATION TYPE STRING,
SCHEDLINESEMIFIRMORDERINDAYS TYPE STRING,
SCHEDULELINEFIRMORDERINDAYS TYPE STRING,
SCHEDAGRMTCUMQTYRECONCILEDATE TYPE STRING,
ITEMLASTTRANSMISSIONDATE TYPE STRING,
SCHEDAGRMTAGREEDCUMQTY TYPE STRING,
SCHEDULEAGREEMENTHASRELEASEDOC TYPE STRING,
SCHEDULELINE TYPE STRING,
HASACTIVEENTITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISSCHEDULEAGMTSCHEDULELIWD_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_ISSCHEDULEAGMTSCHEDULELIWD_STR-KEY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-PARENT_KEY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-ROOT_KEY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-ACTIVESCHEDULINGAGREEMENT sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-ACTIVESCHEDGAGRMTITM sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-ACTIVESCHEDULELINE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-DELIVDATECATEGORY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULELINEDELIVERYDATE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDLINESTSCDELIVERYDATE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULELINEDELIVERYTIME sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULELINEORDERQUANTITY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-PURCHASEREQUISITION sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-PURCHASEREQUISITIONITEM sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-ROUGHGOODSRECEIPTQTY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULELINEOPENQUANTITY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-CUMULATIVESCHEDULEQUANTITY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-PREVIOUSCUMULATIVEQUANTITY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-FIRMTRADEZONEINDAYS sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULELINEISFIXED sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-NOOFREMINDERSOFSCHEDULELINE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-PREVDELIVQTYOFSCHEDULELINE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SOURCEOFCREATION sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDLINESEMIFIRMORDERINDAYS sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULELINEFIRMORDERINDAYS sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDAGRMTCUMQTYRECONCILEDATE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-ITEMLASTTRANSMISSIONDATE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDAGRMTAGREEDCUMQTY sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULEAGREEMENTHASRELEASEDOC sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-SCHEDULELINE sy-vline 
WA_ISSCHEDULEAGMTSCHEDULELIWD_STR-HASACTIVEENTITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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