ABAP Select data from SAP table AMC_MSG_TYPE_V into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AMC_MSG_TYPE_V
*  INTO TABLE @DATA(IT_AMC_MSG_TYPE_V2).
*--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_AMC_MSG_TYPE_V INDEX 1 INTO DATA(WA_AMC_MSG_TYPE_V2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AMC_MSG_TYPE_V>-MESSAGE_TYPE_ID = 1.
<AMC_MSG_TYPE_V>-VERSION = 1.
<AMC_MSG_TYPE_V>-REFERENCE_TYPE = 1.
<AMC_MSG_TYPE_V>-PRODUCER_IMPL_INTERFACE = 1.
<AMC_MSG_TYPE_V>-PRODUCER_IMPL_CLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AMC_MSG_TYPE_V-MARSHALLING_IMPL_INTERFACE, sy-vline,
  WA_AMC_MSG_TYPE_V-MARSHALLING_IMPL_CLASS, sy-vline,
  WA_AMC_MSG_TYPE_V-RECEIVER_IMPL_INTERFACE, sy-vline,
  WA_AMC_MSG_TYPE_V-CHANGED_ON, sy-vline,
  WA_AMC_MSG_TYPE_V-CHANGED_BY, sy-vline,
  WA_AMC_MSG_TYPE_V-CHANGED_AT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AMC_MSG_TYPE_V 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_AMC_MSG_TYPE_V 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_AMC_MSG_TYPE_V INTO WA_AMC_MSG_TYPE_V.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_AMC_MSG_TYPE_V_STR, 
MESSAGE_TYPE_ID TYPE STRING,
VERSION TYPE STRING,
REFERENCE_TYPE TYPE STRING,
PRODUCER_IMPL_INTERFACE TYPE STRING,
PRODUCER_IMPL_CLASS TYPE STRING,
MARSHALLING_IMPL_INTERFACE TYPE STRING,
MARSHALLING_IMPL_CLASS TYPE STRING,
RECEIVER_IMPL_INTERFACE TYPE STRING,
CHANGED_ON TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_AT TYPE STRING,
CREATED_ON TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_AT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AMC_MSG_TYPE_V_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_AMC_MSG_TYPE_V_STR-MESSAGE_TYPE_ID sy-vline 
WA_AMC_MSG_TYPE_V_STR-VERSION sy-vline 
WA_AMC_MSG_TYPE_V_STR-REFERENCE_TYPE sy-vline 
WA_AMC_MSG_TYPE_V_STR-PRODUCER_IMPL_INTERFACE sy-vline 
WA_AMC_MSG_TYPE_V_STR-PRODUCER_IMPL_CLASS sy-vline 
WA_AMC_MSG_TYPE_V_STR-MARSHALLING_IMPL_INTERFACE sy-vline 
WA_AMC_MSG_TYPE_V_STR-MARSHALLING_IMPL_CLASS sy-vline 
WA_AMC_MSG_TYPE_V_STR-RECEIVER_IMPL_INTERFACE sy-vline 
WA_AMC_MSG_TYPE_V_STR-CHANGED_ON sy-vline 
WA_AMC_MSG_TYPE_V_STR-CHANGED_BY sy-vline 
WA_AMC_MSG_TYPE_V_STR-CHANGED_AT sy-vline 
WA_AMC_MSG_TYPE_V_STR-CREATED_ON sy-vline 
WA_AMC_MSG_TYPE_V_STR-CREATED_BY sy-vline 
WA_AMC_MSG_TYPE_V_STR-CREATED_AT sy-vline      INTO ld_text SEPARATED BY SPACE.

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