ABAP Select data from SAP table IMCH into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMCH
*  INTO TABLE @DATA(IT_IMCH2).
*--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_IMCH INDEX 1 INTO DATA(WA_IMCH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IMCH>-CLIENT = 1.
<IMCH>-COMPR_VRSN = 1.
<IMCH>-INV_PROG = 1.
<IMCH>-APPR_YEAR = 1.
<IMCH>-LOGSYSTEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IMCH-DATA_FLAG, sy-vline,
  WA_IMCH-HIER_FLAG, sy-vline,
  WA_IMCH-RECNO, sy-vline,
  WA_IMCH-OWNSYS_FLG, sy-vline,
  WA_IMCH-CREATED_BY, sy-vline,
  WA_IMCH-CREATED_ON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IMCH 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_IMCH 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_IMCH INTO WA_IMCH.


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

*Conversion exit GJAHR, internal->external for field APPR_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_IMCH-APPR_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMCH-APPR_YEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IMCH-LOGSYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMCH-LOGSYSTEM.
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_IMCH_STR, 
CLIENT TYPE STRING,
COMPR_VRSN TYPE STRING,
INV_PROG TYPE STRING,
APPR_YEAR TYPE STRING,
LOGSYSTEM TYPE STRING,
DATA_FLAG TYPE STRING,
HIER_FLAG TYPE STRING,
RECNO TYPE STRING,
OWNSYS_FLG TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_ON TYPE STRING,
UNAME TYPE STRING,
CH_ON TYPE STRING,
HIE_UNAME TYPE STRING,
HIE_CH_ON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMCH_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_IMCH_STR-CLIENT sy-vline 
WA_IMCH_STR-COMPR_VRSN sy-vline 
WA_IMCH_STR-INV_PROG sy-vline 
WA_IMCH_STR-APPR_YEAR sy-vline 
WA_IMCH_STR-LOGSYSTEM sy-vline 
WA_IMCH_STR-DATA_FLAG sy-vline 
WA_IMCH_STR-HIER_FLAG sy-vline 
WA_IMCH_STR-RECNO sy-vline 
WA_IMCH_STR-OWNSYS_FLG sy-vline 
WA_IMCH_STR-CREATED_BY sy-vline 
WA_IMCH_STR-CREATED_ON sy-vline 
WA_IMCH_STR-UNAME sy-vline 
WA_IMCH_STR-CH_ON sy-vline 
WA_IMCH_STR-HIE_UNAME sy-vline 
WA_IMCH_STR-HIE_CH_ON sy-vline      INTO ld_text SEPARATED BY SPACE.

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