ABAP Select data from SAP table RJKSDDEMANDCHANGE_RULE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJKSDDEMANDCHANGE_RULE
*  INTO TABLE @DATA(IT_RJKSDDEMANDCHANGE_RULE2).
*--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_RJKSDDEMANDCHANGE_RULE INDEX 1 INTO DATA(WA_RJKSDDEMANDCHANGE_RULE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJKSDDEMANDCHANGE_RULE>-VERSION = 1.
<RJKSDDEMANDCHANGE_RULE>-ISSUE = 1.
<RJKSDDEMANDCHANGE_RULE>-ISSUE_IDX = 1.
<RJKSDDEMANDCHANGE_RULE>-REF_ISSUE = 1.
<RJKSDDEMANDCHANGE_RULE>-REF_ISSUE_IDX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJKSDDEMANDCHANGE_RULE-XREF_ISSUE_FIX, sy-vline,
  WA_RJKSDDEMANDCHANGE_RULE-PUBLDATE, sy-vline,
  WA_RJKSDDEMANDCHANGE_RULE-PUBLDATE_IDX, sy-vline,
  WA_RJKSDDEMANDCHANGE_RULE-REF_PUBLDATE, sy-vline,
  WA_RJKSDDEMANDCHANGE_RULE-REF_PUBLDATE_IDX, sy-vline,
  WA_RJKSDDEMANDCHANGE_RULE-COPYNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJKSDDEMANDCHANGE_RULE 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_RJKSDDEMANDCHANGE_RULE 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_RJKSDDEMANDCHANGE_RULE INTO WA_RJKSDDEMANDCHANGE_RULE.


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

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

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RJKSDDEMANDCHANGE_RULE-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKSDDEMANDCHANGE_RULE-UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ISSUE_1
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RJKSDDEMANDCHANGE_RULE-ISSUE_1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKSDDEMANDCHANGE_RULE-ISSUE_1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ISSUE_2
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RJKSDDEMANDCHANGE_RULE-ISSUE_2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKSDDEMANDCHANGE_RULE-ISSUE_2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ISSUE_3
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RJKSDDEMANDCHANGE_RULE-ISSUE_3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKSDDEMANDCHANGE_RULE-ISSUE_3.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ISSUE_4
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RJKSDDEMANDCHANGE_RULE-ISSUE_4
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKSDDEMANDCHANGE_RULE-ISSUE_4.
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_RJKSDDEMANDCHANGE_RULE_STR, 
VERSION TYPE STRING,
ISSUE TYPE STRING,
ISSUE_IDX TYPE STRING,
REF_ISSUE TYPE STRING,
REF_ISSUE_IDX TYPE STRING,
XREF_ISSUE_FIX TYPE STRING,
PUBLDATE TYPE STRING,
PUBLDATE_IDX TYPE STRING,
REF_PUBLDATE TYPE STRING,
REF_PUBLDATE_IDX TYPE STRING,
COPYNR TYPE STRING,
COPYNR_IDX TYPE STRING,
REF_COPYNR TYPE STRING,
REF_COPYNR_IDX TYPE STRING,
SELECTED TYPE STRING,
XPERCENT TYPE STRING,
PERCENT TYPE STRING,
XABSOLUTE TYPE STRING,
QUANTITY TYPE STRING,
XREF_ISSUE TYPE STRING,
XFUNCNAME TYPE STRING,
FUNCNAME TYPE STRING,
DATE_FROM TYPE STRING,
DATE_TO TYPE STRING,
QUANTITY_TOTAL TYPE STRING,
UNIT TYPE STRING,
ISSUE_1 TYPE STRING,
ISSUE_2 TYPE STRING,
ISSUE_3 TYPE STRING,
ISSUE_4 TYPE STRING,
WEIGHT_PERC_1 TYPE STRING,
WEIGHT_PERC_2 TYPE STRING,
WEIGHT_PERC_3 TYPE STRING,
WEIGHT_PERC_4 TYPE STRING,
QUANTITY_SUMM_1 TYPE STRING,
QUANTITY_SUMM_2 TYPE STRING,
QUANTITY_SUMM_3 TYPE STRING,
QUANTITY_SUMM_4 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJKSDDEMANDCHANGE_RULE_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_RJKSDDEMANDCHANGE_RULE_STR-VERSION sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-ISSUE sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-ISSUE_IDX sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-REF_ISSUE sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-REF_ISSUE_IDX sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-XREF_ISSUE_FIX sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-PUBLDATE sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-PUBLDATE_IDX sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-REF_PUBLDATE sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-REF_PUBLDATE_IDX sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-COPYNR sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-COPYNR_IDX sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-REF_COPYNR sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-REF_COPYNR_IDX sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-SELECTED sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-XPERCENT sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-PERCENT sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-XABSOLUTE sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-QUANTITY sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-XREF_ISSUE sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-XFUNCNAME sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-FUNCNAME sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-DATE_FROM sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-DATE_TO sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-QUANTITY_TOTAL sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-UNIT sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-ISSUE_1 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-ISSUE_2 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-ISSUE_3 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-ISSUE_4 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-WEIGHT_PERC_1 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-WEIGHT_PERC_2 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-WEIGHT_PERC_3 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-WEIGHT_PERC_4 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-QUANTITY_SUMM_1 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-QUANTITY_SUMM_2 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-QUANTITY_SUMM_3 sy-vline 
WA_RJKSDDEMANDCHANGE_RULE_STR-QUANTITY_SUMM_4 sy-vline      INTO ld_text SEPARATED BY SPACE.

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