ABAP Select data from SAP table SHM_LOCK_INFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SHM_LOCK_INFO
*  INTO TABLE @DATA(IT_SHM_LOCK_INFO2).
*--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_SHM_LOCK_INFO INDEX 1 INTO DATA(WA_SHM_LOCK_INFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SHM_LOCK_INFO>-MARK = 1.
<SHM_LOCK_INFO>-AREA_NAME = 1.
<SHM_LOCK_INFO>-INSTANCE_NAME = 1.
<SHM_LOCK_INFO>-CLIENT = 1.
<SHM_LOCK_INFO>-VERSION_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SHM_LOCK_INFO-LOCK_TYPE, sy-vline,
  WA_SHM_LOCK_INFO-IS_ACTIVE, sy-vline,
  WA_SHM_LOCK_INFO-CNAM, sy-vline,
  WA_SHM_LOCK_INFO-CDAT, sy-vline,
  WA_SHM_LOCK_INFO-CTIME, sy-vline,
  WA_SHM_LOCK_INFO-CCLIENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SHM_LOCK_INFO 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_SHM_LOCK_INFO 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_SHM_LOCK_INFO INTO WA_SHM_LOCK_INFO.


*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_SHM_LOCK_INFO_STR, 
MARK TYPE STRING,
AREA_NAME TYPE STRING,
INSTANCE_NAME TYPE STRING,
CLIENT TYPE STRING,
VERSION_ID TYPE STRING,
LOCK_TYPE TYPE STRING,
IS_ACTIVE TYPE STRING,
CNAM TYPE STRING,
CDAT TYPE STRING,
CTIME TYPE STRING,
CCLIENT TYPE STRING,
ATTACH_PROGRAM TYPE STRING,
ATTACH_INCLUDE TYPE STRING,
ATTACH_LINE TYPE STRING,
ATTACH_PID TYPE STRING,
CURRENT_PROGRAM TYPE STRING,
CURRENT_PID TYPE STRING,
TIMES TYPE STRING,
LOCK_LABEL TYPE STRING,
LOCK_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SHM_LOCK_INFO_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_SHM_LOCK_INFO_STR-MARK sy-vline 
WA_SHM_LOCK_INFO_STR-AREA_NAME sy-vline 
WA_SHM_LOCK_INFO_STR-INSTANCE_NAME sy-vline 
WA_SHM_LOCK_INFO_STR-CLIENT sy-vline 
WA_SHM_LOCK_INFO_STR-VERSION_ID sy-vline 
WA_SHM_LOCK_INFO_STR-LOCK_TYPE sy-vline 
WA_SHM_LOCK_INFO_STR-IS_ACTIVE sy-vline 
WA_SHM_LOCK_INFO_STR-CNAM sy-vline 
WA_SHM_LOCK_INFO_STR-CDAT sy-vline 
WA_SHM_LOCK_INFO_STR-CTIME sy-vline 
WA_SHM_LOCK_INFO_STR-CCLIENT sy-vline 
WA_SHM_LOCK_INFO_STR-ATTACH_PROGRAM sy-vline 
WA_SHM_LOCK_INFO_STR-ATTACH_INCLUDE sy-vline 
WA_SHM_LOCK_INFO_STR-ATTACH_LINE sy-vline 
WA_SHM_LOCK_INFO_STR-ATTACH_PID sy-vline 
WA_SHM_LOCK_INFO_STR-CURRENT_PROGRAM sy-vline 
WA_SHM_LOCK_INFO_STR-CURRENT_PID sy-vline 
WA_SHM_LOCK_INFO_STR-TIMES sy-vline 
WA_SHM_LOCK_INFO_STR-LOCK_LABEL sy-vline 
WA_SHM_LOCK_INFO_STR-LOCK_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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