ABAP Select data from SAP table /KJCH1/CRNR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /KJCH1/CRNR 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 /KJCH1/CRNR. 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 /KJCH1/CRNR 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_/KJCH1/CRNR TYPE STANDARD TABLE OF /KJCH1/CRNR,
      WA_/KJCH1/CRNR TYPE /KJCH1/CRNR,
      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: </KJCH1/CRNR> TYPE /KJCH1/CRNR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/KJCH1/CRNR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /KJCH1/CRNR
  INTO TABLE IT_/KJCH1/CRNR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /KJCH1/CRNR
*  INTO TABLE @DATA(IT_/KJCH1/CRNR2).
*--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_/KJCH1/CRNR INDEX 1 INTO DATA(WA_/KJCH1/CRNR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/KJCH1/CRNR ASSIGNING </KJCH1/CRNR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</KJCH1/CRNR>-MANDT = 1.
</KJCH1/CRNR>-VKORG = 1.
</KJCH1/CRNR>-NUMKI = 1.
</KJCH1/CRNR>-NUMKE = 1.
</KJCH1/CRNR>-PARVW1 = 1.

ENDLOOP.

LOOP AT IT_/KJCH1/CRNR INTO WA_/KJCH1/CRNR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/KJCH1/CRNR-PARVW2, sy-vline,
  WA_/KJCH1/CRNR-PARVW3, sy-vline,
  WA_/KJCH1/CRNR-PARVW4, sy-vline,
  WA_/KJCH1/CRNR-PARVW5, sy-vline,
  WA_/KJCH1/CRNR-PARVW6, sy-vline,
  WA_/KJCH1/CRNR-SOFSTSCNSET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/KJCH1/CRNR 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_/KJCH1/CRNR 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_/KJCH1/CRNR INTO WA_/KJCH1/CRNR.


*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 PARVW, internal->external for field PARVW1
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_/KJCH1/CRNR-PARVW1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KJCH1/CRNR-PARVW1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW2
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_/KJCH1/CRNR-PARVW2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KJCH1/CRNR-PARVW2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW3
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_/KJCH1/CRNR-PARVW3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KJCH1/CRNR-PARVW3.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW4
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_/KJCH1/CRNR-PARVW4
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KJCH1/CRNR-PARVW4.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW5
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_/KJCH1/CRNR-PARVW5
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KJCH1/CRNR-PARVW5.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW6
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_/KJCH1/CRNR-PARVW6
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/KJCH1/CRNR-PARVW6.
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_/KJCH1/CRNR_STR, 
MANDT TYPE STRING,
VKORG TYPE STRING,
NUMKI TYPE STRING,
NUMKE TYPE STRING,
PARVW1 TYPE STRING,
PARVW2 TYPE STRING,
PARVW3 TYPE STRING,
PARVW4 TYPE STRING,
PARVW5 TYPE STRING,
PARVW6 TYPE STRING,
SOFSTSCNSET TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/KJCH1/CRNR_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_/KJCH1/CRNR_STR-MANDT sy-vline 
WA_/KJCH1/CRNR_STR-VKORG sy-vline 
WA_/KJCH1/CRNR_STR-NUMKI sy-vline 
WA_/KJCH1/CRNR_STR-NUMKE sy-vline 
WA_/KJCH1/CRNR_STR-PARVW1 sy-vline 
WA_/KJCH1/CRNR_STR-PARVW2 sy-vline 
WA_/KJCH1/CRNR_STR-PARVW3 sy-vline 
WA_/KJCH1/CRNR_STR-PARVW4 sy-vline 
WA_/KJCH1/CRNR_STR-PARVW5 sy-vline 
WA_/KJCH1/CRNR_STR-PARVW6 sy-vline 
WA_/KJCH1/CRNR_STR-SOFSTSCNSET sy-vline      INTO ld_text SEPARATED BY SPACE.

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