ABAP Select data from SAP table /SAPCND/MNT_SESSION_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPCND/MNT_SESSION_DATA
*  INTO TABLE @DATA(IT_/SAPCND/MNT_SESSION_DATA2).
*--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_/SAPCND/MNT_SESSION_DATA INDEX 1 INTO DATA(WA_/SAPCND/MNT_SESSION_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPCND/MNT_SESSION_DATA>-HSESSION = 1.
</SAPCND/MNT_SESSION_DATA>-SESSION_ID = 1.
</SAPCND/MNT_SESSION_DATA>-CLIENT = 1.
</SAPCND/MNT_SESSION_DATA>-APPLICATION = 1.
</SAPCND/MNT_SESSION_DATA>-MAINT_CONTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPCND/MNT_SESSION_DATA-MAINT_CONTEXT_DATA, sy-vline,
  WA_/SAPCND/MNT_SESSION_DATA-GROUPNAME, sy-vline,
  WA_/SAPCND/MNT_SESSION_DATA-GROUP_I, sy-vline,
  WA_/SAPCND/MNT_SESSION_DATA-T688C_GROUP, sy-vline,
  WA_/SAPCND/MNT_SESSION_DATA-USE_GROUP_WS, sy-vline,
  WA_/SAPCND/MNT_SESSION_DATA-CT_USAGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPCND/MNT_SESSION_DATA 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_/SAPCND/MNT_SESSION_DATA 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_/SAPCND/MNT_SESSION_DATA INTO WA_/SAPCND/MNT_SESSION_DATA.


*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_/SAPCND/MNT_SESSION_DATA_STR, 
HSESSION TYPE STRING,
SESSION_ID TYPE STRING,
CLIENT TYPE STRING,
APPLICATION TYPE STRING,
MAINT_CONTEXT TYPE STRING,
MAINT_CONTEXT_DATA TYPE STRING,
GROUPNAME TYPE STRING,
GROUP_I TYPE STRING,
T688C_GROUP TYPE STRING,
USE_GROUP_WS TYPE STRING,
CT_USAGE TYPE STRING,
USE_JAVA_OW TYPE STRING,
DEBUG_TRACE_ENABLED TYPE STRING,
AFTER_IMP_MODE TYPE STRING,
DISCARD_NON_PROCESSABLE_ITEMS TYPE STRING,
TRUSTED_MODE TYPE STRING,
NO_ENQUEUE TYPE STRING,
NO_CHANGE_OR_REUSE_OF_VARNUMH TYPE STRING,
SPECIAL_MODE TYPE STRING,
PUT_BEFORE_IMAGE_TO_DBA TYPE STRING,
PUT_ALL_RECORDS_TO_DBA TYPE STRING,
HLOG_DEBUG_TRACE TYPE STRING,
VALIDITY_DATA TYPE STRING,
WINDOW_BEGIN TYPE STRING,
WINDOW_END TYPE STRING,
EXCEEDING_PERIOD TYPE STRING,
ATTR_ENQUEUE_COUNTER TYPE STRING,
SEMANTIC_KEY_INDEX TYPE STRING,
WORKING_SET_INT TYPE STRING,
WORKING_SET_INT_DB TYPE STRING,
CONTEXT_SEARCH_KEY TYPE STRING,
CONTEXT_KEY_BUFFER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPCND/MNT_SESSION_DATA_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_/SAPCND/MNT_SESSION_DATA_STR-HSESSION sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-SESSION_ID sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-CLIENT sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-APPLICATION sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-MAINT_CONTEXT sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-MAINT_CONTEXT_DATA sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-GROUPNAME sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-GROUP_I sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-T688C_GROUP sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-USE_GROUP_WS sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-CT_USAGE sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-USE_JAVA_OW sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-DEBUG_TRACE_ENABLED sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-AFTER_IMP_MODE sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-DISCARD_NON_PROCESSABLE_ITEMS sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-TRUSTED_MODE sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-NO_ENQUEUE sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-NO_CHANGE_OR_REUSE_OF_VARNUMH sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-SPECIAL_MODE sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-PUT_BEFORE_IMAGE_TO_DBA sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-PUT_ALL_RECORDS_TO_DBA sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-HLOG_DEBUG_TRACE sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-VALIDITY_DATA sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-WINDOW_BEGIN sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-WINDOW_END sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-EXCEEDING_PERIOD sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-ATTR_ENQUEUE_COUNTER sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-SEMANTIC_KEY_INDEX sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-WORKING_SET_INT sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-WORKING_SET_INT_DB sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-CONTEXT_SEARCH_KEY sy-vline 
WA_/SAPCND/MNT_SESSION_DATA_STR-CONTEXT_KEY_BUFFER sy-vline      INTO ld_text SEPARATED BY SPACE.

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