ABAP Select data from SAP table COVDATVOL 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 COVDATVOL 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 COVDATVOL. 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 COVDATVOL 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_COVDATVOL TYPE STANDARD TABLE OF COVDATVOL,
      WA_COVDATVOL TYPE COVDATVOL,
      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: <COVDATVOL> TYPE COVDATVOL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM COVDATVOL
*  INTO TABLE @DATA(IT_COVDATVOL2).
*--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_COVDATVOL INDEX 1 INTO DATA(WA_COVDATVOL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<COVDATVOL>-DDATE = 1.
<COVDATVOL>-TTIME = 1.
<COVDATVOL>-SERVER = 1.
<COVDATVOL>-NUMPROG = 1.
<COVDATVOL>-NUMTRIG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_COVDATVOL-DURATION, sy-vline,
  WA_COVDATVOL-VERSION, sy-vline,
  WA_COVDATVOL-DURATIOND, sy-vline,
  WA_COVDATVOL-DURATIONM, sy-vline,
  WA_COVDATVOL-PDOUBLE, sy-vline,
  WA_COVDATVOL-TDOUBLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_COVDATVOL 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_COVDATVOL 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_COVDATVOL INTO WA_COVDATVOL.


*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_COVDATVOL_STR, 
DDATE TYPE STRING,
TTIME TYPE STRING,
SERVER TYPE STRING,
NUMPROG TYPE STRING,
NUMTRIG TYPE STRING,
DURATION TYPE STRING,
VERSION TYPE STRING,
DURATIOND TYPE STRING,
DURATIONM TYPE STRING,
PDOUBLE TYPE STRING,
TDOUBLE TYPE STRING,
UNAME TYPE STRING,
PARTID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_COVDATVOL_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_COVDATVOL_STR-DDATE sy-vline 
WA_COVDATVOL_STR-TTIME sy-vline 
WA_COVDATVOL_STR-SERVER sy-vline 
WA_COVDATVOL_STR-NUMPROG sy-vline 
WA_COVDATVOL_STR-NUMTRIG sy-vline 
WA_COVDATVOL_STR-DURATION sy-vline 
WA_COVDATVOL_STR-VERSION sy-vline 
WA_COVDATVOL_STR-DURATIOND sy-vline 
WA_COVDATVOL_STR-DURATIONM sy-vline 
WA_COVDATVOL_STR-PDOUBLE sy-vline 
WA_COVDATVOL_STR-TDOUBLE sy-vline 
WA_COVDATVOL_STR-UNAME sy-vline 
WA_COVDATVOL_STR-PARTID sy-vline      INTO ld_text SEPARATED BY SPACE.

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