ABAP Select data from SAP table JVA_MDR_VNT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM JVA_MDR_VNT
*  INTO TABLE @DATA(IT_JVA_MDR_VNT2).
*--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_JVA_MDR_VNT INDEX 1 INTO DATA(WA_JVA_MDR_VNT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<JVA_MDR_VNT>-CTRL = 1.
<JVA_MDR_VNT>-MANDT = 1.
<JVA_MDR_VNT>-LOGSYS = 1.
<JVA_MDR_VNT>-UNAME = 1.
<JVA_MDR_VNT>-TIME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_JVA_MDR_VNT-RFCDEST, sy-vline,
  WA_JVA_MDR_VNT-TCODE, sy-vline,
  WA_JVA_MDR_VNT-SYSID, sy-vline,
  WA_JVA_MDR_VNT-AIF_NS, sy-vline,
  WA_JVA_MDR_VNT-AIF_QUEUE_NAME, sy-vline,
  WA_JVA_MDR_VNT-PAYLOAD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_JVA_MDR_VNT 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_JVA_MDR_VNT 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_JVA_MDR_VNT INTO WA_JVA_MDR_VNT.


*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 LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_JVA_MDR_VNT-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_JVA_MDR_VNT-LOGSYS.
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_JVA_MDR_VNT_STR, 
CTRL TYPE STRING,
MANDT TYPE STRING,
LOGSYS TYPE STRING,
UNAME TYPE STRING,
TIME TYPE STRING,
RFCDEST TYPE STRING,
TCODE TYPE STRING,
SYSID TYPE STRING,
AIF_NS TYPE STRING,
AIF_QUEUE_NAME TYPE STRING,
PAYLOAD TYPE STRING,
CTRL TYPE STRING,
DATA TYPE STRING,
T8JV TYPE STRING,
T8JVT TYPE STRING,
T8JG TYPE STRING,
T8JF TYPE STRING,
T8JFT TYPE STRING,
T8JQ TYPE STRING,
T8J2C TYPE STRING,
T8JI TYPE STRING,
T8JSC TYPE STRING,
T8JVORP TYPE STRING,
T8JVET TYPE STRING,
T8JC2 TYPE STRING,
T8J3E TYPE STRING,
CUST TYPE STRING,
T8J2A TYPE STRING,
T8J2B TYPE STRING,
T8J2D TYPE STRING,
T8J2E TYPE STRING,
PRPSSUB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_JVA_MDR_VNT_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_JVA_MDR_VNT_STR-CTRL sy-vline 
WA_JVA_MDR_VNT_STR-MANDT sy-vline 
WA_JVA_MDR_VNT_STR-LOGSYS sy-vline 
WA_JVA_MDR_VNT_STR-UNAME sy-vline 
WA_JVA_MDR_VNT_STR-TIME sy-vline 
WA_JVA_MDR_VNT_STR-RFCDEST sy-vline 
WA_JVA_MDR_VNT_STR-TCODE sy-vline 
WA_JVA_MDR_VNT_STR-SYSID sy-vline 
WA_JVA_MDR_VNT_STR-AIF_NS sy-vline 
WA_JVA_MDR_VNT_STR-AIF_QUEUE_NAME sy-vline 
WA_JVA_MDR_VNT_STR-PAYLOAD sy-vline 
WA_JVA_MDR_VNT_STR-CTRL sy-vline 
WA_JVA_MDR_VNT_STR-DATA sy-vline 
WA_JVA_MDR_VNT_STR-T8JV sy-vline 
WA_JVA_MDR_VNT_STR-T8JVT sy-vline 
WA_JVA_MDR_VNT_STR-T8JG sy-vline 
WA_JVA_MDR_VNT_STR-T8JF sy-vline 
WA_JVA_MDR_VNT_STR-T8JFT sy-vline 
WA_JVA_MDR_VNT_STR-T8JQ sy-vline 
WA_JVA_MDR_VNT_STR-T8J2C sy-vline 
WA_JVA_MDR_VNT_STR-T8JI sy-vline 
WA_JVA_MDR_VNT_STR-T8JSC sy-vline 
WA_JVA_MDR_VNT_STR-T8JVORP sy-vline 
WA_JVA_MDR_VNT_STR-T8JVET sy-vline 
WA_JVA_MDR_VNT_STR-T8JC2 sy-vline 
WA_JVA_MDR_VNT_STR-T8J3E sy-vline 
WA_JVA_MDR_VNT_STR-CUST sy-vline 
WA_JVA_MDR_VNT_STR-T8J2A sy-vline 
WA_JVA_MDR_VNT_STR-T8J2B sy-vline 
WA_JVA_MDR_VNT_STR-T8J2D sy-vline 
WA_JVA_MDR_VNT_STR-T8J2E sy-vline 
WA_JVA_MDR_VNT_STR-PRPSSUB sy-vline      INTO ld_text SEPARATED BY SPACE.

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