ABAP Select data from SAP table MSSLOCK7 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MSSLOCK7 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 MSSLOCK7. 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 MSSLOCK7 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_MSSLOCK7 TYPE STANDARD TABLE OF MSSLOCK7,
      WA_MSSLOCK7 TYPE MSSLOCK7,
      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: <MSSLOCK7> TYPE MSSLOCK7.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MSSLOCK7.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MSSLOCK7
  INTO TABLE IT_MSSLOCK7.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSSLOCK7
*  INTO TABLE @DATA(IT_MSSLOCK72).
*--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_MSSLOCK7 INDEX 1 INTO DATA(WA_MSSLOCK72).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MSSLOCK7 ASSIGNING <MSSLOCK7>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSSLOCK7>-SPID = 1.
<MSSLOCK7>-KPID = 1.
<MSSLOCK7>-STATUS = 1.
<MSSLOCK7>-USERNAME = 1.
<MSSLOCK7>-HOSTNAME = 1.

ENDLOOP.

LOOP AT IT_MSSLOCK7 INTO WA_MSSLOCK7.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSSLOCK7-PROGNAME, sy-vline,
  WA_MSSLOCK7-HOSTPID, sy-vline,
  WA_MSSLOCK7-EXECCMD, sy-vline,
  WA_MSSLOCK7-BLOCKED, sy-vline,
  WA_MSSLOCK7-WAITTYPE, sy-vline,
  WA_MSSLOCK7-WAITTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSSLOCK7 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_MSSLOCK7 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_MSSLOCK7 INTO WA_MSSLOCK7.


*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_MSSLOCK7_STR, 
SPID TYPE STRING,
KPID TYPE STRING,
STATUS TYPE STRING,
USERNAME TYPE STRING,
HOSTNAME TYPE STRING,
PROGNAME TYPE STRING,
HOSTPID TYPE STRING,
EXECCMD TYPE STRING,
BLOCKED TYPE STRING,
WAITTYPE TYPE STRING,
WAITTIME TYPE STRING,
BINLOCK TYPE STRING,
LCKVALBLK TYPE STRING,
INDNAME TYPE STRING,
LCKSTATUS TYPE STRING,
LCKREFCNT TYPE STRING,
LCKCARCNT TYPE STRING,
LCKLFETIME TYPE STRING,
ECID TYPE STRING,
LCKOWNERTY TYPE STRING,
DBASENAME TYPE STRING,
OBJNAME TYPE STRING,
LOCKRES TYPE STRING,
LOCKTYPE TYPE STRING,
LOCKNAME TYPE STRING,
SAPUSER TYPE STRING,
REPORTNAME TYPE STRING,
NESTLEVEL TYPE STRING,
HPID_TEXT TYPE STRING,
SPID_TEXT TYPE STRING,
STATUS_TXT TYPE STRING,
LCKOWNERTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSSLOCK7_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_MSSLOCK7_STR-SPID sy-vline 
WA_MSSLOCK7_STR-KPID sy-vline 
WA_MSSLOCK7_STR-STATUS sy-vline 
WA_MSSLOCK7_STR-USERNAME sy-vline 
WA_MSSLOCK7_STR-HOSTNAME sy-vline 
WA_MSSLOCK7_STR-PROGNAME sy-vline 
WA_MSSLOCK7_STR-HOSTPID sy-vline 
WA_MSSLOCK7_STR-EXECCMD sy-vline 
WA_MSSLOCK7_STR-BLOCKED sy-vline 
WA_MSSLOCK7_STR-WAITTYPE sy-vline 
WA_MSSLOCK7_STR-WAITTIME sy-vline 
WA_MSSLOCK7_STR-BINLOCK sy-vline 
WA_MSSLOCK7_STR-LCKVALBLK sy-vline 
WA_MSSLOCK7_STR-INDNAME sy-vline 
WA_MSSLOCK7_STR-LCKSTATUS sy-vline 
WA_MSSLOCK7_STR-LCKREFCNT sy-vline 
WA_MSSLOCK7_STR-LCKCARCNT sy-vline 
WA_MSSLOCK7_STR-LCKLFETIME sy-vline 
WA_MSSLOCK7_STR-ECID sy-vline 
WA_MSSLOCK7_STR-LCKOWNERTY sy-vline 
WA_MSSLOCK7_STR-DBASENAME sy-vline 
WA_MSSLOCK7_STR-OBJNAME sy-vline 
WA_MSSLOCK7_STR-LOCKRES sy-vline 
WA_MSSLOCK7_STR-LOCKTYPE sy-vline 
WA_MSSLOCK7_STR-LOCKNAME sy-vline 
WA_MSSLOCK7_STR-SAPUSER sy-vline 
WA_MSSLOCK7_STR-REPORTNAME sy-vline 
WA_MSSLOCK7_STR-NESTLEVEL sy-vline 
WA_MSSLOCK7_STR-HPID_TEXT sy-vline 
WA_MSSLOCK7_STR-SPID_TEXT sy-vline 
WA_MSSLOCK7_STR-STATUS_TXT sy-vline 
WA_MSSLOCK7_STR-LCKOWNERTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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