ABAP Select data from SAP table JVAH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM JVAH
*  INTO TABLE @DATA(IT_JVAH2).
*--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_JVAH INDEX 1 INTO DATA(WA_JVAH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<JVAH>-RCLNR = 1.
<JVAH>-AWTYP = 1.
<JVAH>-REFDOCNR = 1.
<JVAH>-AWORG = 1.
<JVAH>-LOGSYS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_JVAH-DOCNR, sy-vline,
  WA_JVAH-JVA_DOCNR, sy-vline,
  WA_JVAH-ACTIV, sy-vline,
  WA_JVAH-RBUKRS, sy-vline,
  WA_JVAH-DOCTY, sy-vline,
  WA_JVAH-RYEAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_JVAH 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_JVAH 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_JVAH INTO WA_JVAH.


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

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_JVAH-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_JVAH-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_JVAH-DOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_JVAH-DOCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field JVA_DOCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_JVAH-JVA_DOCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_JVAH-JVA_DOCNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field BELNR_PRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_JVAH-BELNR_PRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_JVAH-BELNR_PRE.
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_JVAH_STR, 
RCLNR TYPE STRING,
AWTYP TYPE STRING,
REFDOCNR TYPE STRING,
AWORG TYPE STRING,
LOGSYS TYPE STRING,
DOCNR TYPE STRING,
JVA_DOCNR TYPE STRING,
ACTIV TYPE STRING,
RBUKRS TYPE STRING,
DOCTY TYPE STRING,
RYEAR TYPE STRING,
BUDAT TYPE STRING,
BLDAT TYPE STRING,
WSDAT TYPE STRING,
USNAM TYPE STRING,
CPUDT TYPE STRING,
CPUTM TYPE STRING,
POPER TYPE STRING,
BELNR_PRE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_JVAH_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_JVAH_STR-RCLNR sy-vline 
WA_JVAH_STR-AWTYP sy-vline 
WA_JVAH_STR-REFDOCNR sy-vline 
WA_JVAH_STR-AWORG sy-vline 
WA_JVAH_STR-LOGSYS sy-vline 
WA_JVAH_STR-DOCNR sy-vline 
WA_JVAH_STR-JVA_DOCNR sy-vline 
WA_JVAH_STR-ACTIV sy-vline 
WA_JVAH_STR-RBUKRS sy-vline 
WA_JVAH_STR-DOCTY sy-vline 
WA_JVAH_STR-RYEAR sy-vline 
WA_JVAH_STR-BUDAT sy-vline 
WA_JVAH_STR-BLDAT sy-vline 
WA_JVAH_STR-WSDAT sy-vline 
WA_JVAH_STR-USNAM sy-vline 
WA_JVAH_STR-CPUDT sy-vline 
WA_JVAH_STR-CPUTM sy-vline 
WA_JVAH_STR-POPER sy-vline 
WA_JVAH_STR-BELNR_PRE sy-vline      INTO ld_text SEPARATED BY SPACE.

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