ABAP Select data from SAP table /MVA/AMAVICDEMSGALL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MVA/AMAVICDEMSGALL
*  INTO TABLE @DATA(IT_/MVA/AMAVICDEMSGALL2).
*--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_/MVA/AMAVICDEMSGALL INDEX 1 INTO DATA(WA_/MVA/AMAVICDEMSGALL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MVA/AMAVICDEMSGALL>-MSGTY = 1.
</MVA/AMAVICDEMSGALL>-MSGID = 1.
</MVA/AMAVICDEMSGALL>-MSGNO = 1.
</MVA/AMAVICDEMSGALL>-MSGV1 = 1.
</MVA/AMAVICDEMSGALL>-MSGV2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MVA/AMAVICDEMSGALL-MSGV3, sy-vline,
  WA_/MVA/AMAVICDEMSGALL-MSGV4, sy-vline,
  WA_/MVA/AMAVICDEMSGALL-MSGV1_SRC, sy-vline,
  WA_/MVA/AMAVICDEMSGALL-MSGV2_SRC, sy-vline,
  WA_/MVA/AMAVICDEMSGALL-MSGV3_SRC, sy-vline,
  WA_/MVA/AMAVICDEMSGALL-MSGV4_SRC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MVA/AMAVICDEMSGALL 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_/MVA/AMAVICDEMSGALL 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_/MVA/AMAVICDEMSGALL INTO WA_/MVA/AMAVICDEMSGALL.


*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_/MVA/AMAVICDEMSGALL_STR, 
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
MSGV1_SRC TYPE STRING,
MSGV2_SRC TYPE STRING,
MSGV3_SRC TYPE STRING,
MSGV4_SRC TYPE STRING,
DETLEVEL TYPE STRING,
PROBCLASS TYPE STRING,
ALSORT TYPE STRING,
TIME_STMP TYPE STRING,
MSG_COUNT TYPE STRING,
CONTEXT TYPE STRING,
TABNAME TYPE STRING,
VALUE TYPE STRING,
PARAMS TYPE STRING,
T_PAR TYPE STRING,
CALLBACK TYPE STRING,
USEREXITP TYPE STRING,
USEREXITF TYPE STRING,
USEREXITT TYPE STRING,
ALTEXT TYPE STRING,
PPO_FG TYPE STRING,
FPP_FG TYPE STRING,
BCS_FG TYPE STRING,
PROCESS_ID TYPE STRING,
ACTION_ID TYPE STRING,
RECORD_TYPE_CD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MVA/AMAVICDEMSGALL_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_/MVA/AMAVICDEMSGALL_STR-MSGTY sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGID sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGNO sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV1 sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV2 sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV3 sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV4 sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV1_SRC sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV2_SRC sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV3_SRC sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSGV4_SRC sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-DETLEVEL sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-PROBCLASS sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-ALSORT sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-TIME_STMP sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-MSG_COUNT sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-CONTEXT sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-TABNAME sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-VALUE sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-PARAMS sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-T_PAR sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-CALLBACK sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-USEREXITP sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-USEREXITF sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-USEREXITT sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-ALTEXT sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-PPO_FG sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-FPP_FG sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-BCS_FG sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-PROCESS_ID sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-ACTION_ID sy-vline 
WA_/MVA/AMAVICDEMSGALL_STR-RECORD_TYPE_CD sy-vline      INTO ld_text SEPARATED BY SPACE.

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