ABAP Select data from SAP table EMMA_CLASSINFO 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 EMMA_CLASSINFO 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 EMMA_CLASSINFO. 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 EMMA_CLASSINFO 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_EMMA_CLASSINFO TYPE STANDARD TABLE OF EMMA_CLASSINFO,
      WA_EMMA_CLASSINFO TYPE EMMA_CLASSINFO,
      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: <EMMA_CLASSINFO> TYPE EMMA_CLASSINFO.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EMMA_CLASSINFO
*  INTO TABLE @DATA(IT_EMMA_CLASSINFO2).
*--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_EMMA_CLASSINFO INDEX 1 INTO DATA(WA_EMMA_CLASSINFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EMMA_CLASSINFO>-TCODE = 1.
<EMMA_CLASSINFO>-BPCODE = 1.
<EMMA_CLASSINFO>-BPAREA = 1.
<EMMA_CLASSINFO>-OBJTYPE = 1.
<EMMA_CLASSINFO>-CLASSEMMAJOB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EMMA_CLASSINFO-CLASSLOGNR, sy-vline,
  WA_EMMA_CLASSINFO-CLASSINTINFO, sy-vline,
  WA_EMMA_CLASSINFO-CLASSCOUNTMSG, sy-vline,
  WA_EMMA_CLASSINFO-MSGID_START, sy-vline,
  WA_EMMA_CLASSINFO-MSGNO_START, sy-vline,
  WA_EMMA_CLASSINFO-MSGVARNO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EMMA_CLASSINFO 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_EMMA_CLASSINFO 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_EMMA_CLASSINFO INTO WA_EMMA_CLASSINFO.


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

*Conversion exit ALPHA, internal->external for field BPAREA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EMMA_CLASSINFO-BPAREA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EMMA_CLASSINFO-BPAREA.
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_EMMA_CLASSINFO_STR, 
TCODE TYPE STRING,
BPCODE TYPE STRING,
BPAREA TYPE STRING,
OBJTYPE TYPE STRING,
CLASSEMMAJOB TYPE STRING,
CLASSLOGNR TYPE STRING,
CLASSINTINFO TYPE STRING,
CLASSCOUNTMSG TYPE STRING,
MSGID_START TYPE STRING,
MSGNO_START TYPE STRING,
MSGVARNO TYPE STRING,
MSGID_END TYPE STRING,
MSGNO_END TYPE STRING,
MSGID_MODE TYPE STRING,
MSGNO_MODE TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
XPRUN TYPE STRING,
CLASSJOB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EMMA_CLASSINFO_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_EMMA_CLASSINFO_STR-TCODE sy-vline 
WA_EMMA_CLASSINFO_STR-BPCODE sy-vline 
WA_EMMA_CLASSINFO_STR-BPAREA sy-vline 
WA_EMMA_CLASSINFO_STR-OBJTYPE sy-vline 
WA_EMMA_CLASSINFO_STR-CLASSEMMAJOB sy-vline 
WA_EMMA_CLASSINFO_STR-CLASSLOGNR sy-vline 
WA_EMMA_CLASSINFO_STR-CLASSINTINFO sy-vline 
WA_EMMA_CLASSINFO_STR-CLASSCOUNTMSG sy-vline 
WA_EMMA_CLASSINFO_STR-MSGID_START sy-vline 
WA_EMMA_CLASSINFO_STR-MSGNO_START sy-vline 
WA_EMMA_CLASSINFO_STR-MSGVARNO sy-vline 
WA_EMMA_CLASSINFO_STR-MSGID_END sy-vline 
WA_EMMA_CLASSINFO_STR-MSGNO_END sy-vline 
WA_EMMA_CLASSINFO_STR-MSGID_MODE sy-vline 
WA_EMMA_CLASSINFO_STR-MSGNO_MODE sy-vline 
WA_EMMA_CLASSINFO_STR-MSGV1 sy-vline 
WA_EMMA_CLASSINFO_STR-MSGV2 sy-vline 
WA_EMMA_CLASSINFO_STR-MSGV3 sy-vline 
WA_EMMA_CLASSINFO_STR-MSGV4 sy-vline 
WA_EMMA_CLASSINFO_STR-XPRUN sy-vline 
WA_EMMA_CLASSINFO_STR-CLASSJOB sy-vline      INTO ld_text SEPARATED BY SPACE.

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