ABAP Select data from SAP table DB6PMCD2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB6PMCD2 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 DB6PMCD2. 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 DB6PMCD2 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_DB6PMCD2 TYPE STANDARD TABLE OF DB6PMCD2,
      WA_DB6PMCD2 TYPE DB6PMCD2,
      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: <DB6PMCD2> TYPE DB6PMCD2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB6PMCD2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB6PMCD2
  INTO TABLE IT_DB6PMCD2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB6PMCD2
*  INTO TABLE @DATA(IT_DB6PMCD22).
*--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_DB6PMCD2 INDEX 1 INTO DATA(WA_DB6PMCD22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB6PMCD2 ASSIGNING <DB6PMCD2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB6PMCD2>-COMPTIME = 1.
<DB6PMCD2>-PARTITN = 1.
<DB6PMCD2>-CALLERFLAG = 1.
<DB6PMCD2>-DBMSTRTTME = 1.
<DB6PMCD2>-PRGVERS = 1.

ENDLOOP.

LOOP AT IT_DB6PMCD2 INTO WA_DB6PMCD2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB6PMCD2-DL_WT_IEXP, sy-vline,
  WA_DB6PMCD2-DB_MEMORY, sy-vline,
  WA_DB6PMCD2-APG_MEM_SZ, sy-vline,
  WA_DB6PMCD2-GRPHP_RAT, sy-vline,
  WA_DB6PMCD2-SHEAPTRES, sy-vline,
  WA_DB6PMCD2-TRACKMOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB6PMCD2 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_DB6PMCD2 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_DB6PMCD2 INTO WA_DB6PMCD2.


*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_DB6PMCD2_STR, 
COMPTIME TYPE STRING,
PARTITN TYPE STRING,
CALLERFLAG TYPE STRING,
DBMSTRTTME TYPE STRING,
PRGVERS TYPE STRING,
DL_WT_IEXP TYPE STRING,
DB_MEMORY TYPE STRING,
APG_MEM_SZ TYPE STRING,
GRPHP_RAT TYPE STRING,
SHEAPTRES TYPE STRING,
TRACKMOD TYPE STRING,
OV_LOGPATH TYPE STRING,
MR_LOGPATH TYPE STRING,
BLK_LD_FUL TYPE STRING,
MAXLOG TYPE STRING,
NUMLOGSP TYPE STRING,
FAILOVERLOG TYPE STRING,
ARCHMETH1 TYPE STRING,
ARCHMETH2 TYPE STRING,
ARCHMETH1OPT TYPE STRING,
ARCHMETH2OPT TYPE STRING,
NUMARCHRETRY TYPE STRING,
ARCHRETRYDELAY TYPE STRING,
AUTO_MAINT TYPE STRING,
AUTO_DB_BACKUP TYPE STRING,
AUTO_TBL_MAINT TYPE STRING,
AUTO_RUNSTATS TYPE STRING,
AUTO_STATS_PROF TYPE STRING,
AUTO_PROF_UPD TYPE STRING,
AUTO_REORG TYPE STRING,
VENDOROPT TYPE STRING,
AUTO_SWITCHES TYPE STRING,
HADR_DB_ROLE TYPE STRING,
HADR_LOCAL_HOST TYPE STRING,
HADR_LOCAL_SVC TYPE STRING,
HADR_REMOTE_HOST TYPE STRING,
HADR_REMOTE_SVC TYPE STRING,
HADR_REMOTE_INST TYPE STRING,
HADR_TIMEOUT TYPE STRING,
HADR_SYNCMODE TYPE STRING,
PAGESIZE TYPE STRING,
LOGINDEXBUILD TYPE STRING,
DFT_MTTB_TYPES TYPE STRING,
ALT_COLLATE TYPE STRING,
SELF_TUNING_MEM TYPE STRING,
RESTRICT_ACCESS TYPE STRING,
DB_MEM_THRESH TYPE STRING,
COLLATE_INFO TYPE STRING,
MIN_DEC_DIVC3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB6PMCD2_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_DB6PMCD2_STR-COMPTIME sy-vline 
WA_DB6PMCD2_STR-PARTITN sy-vline 
WA_DB6PMCD2_STR-CALLERFLAG sy-vline 
WA_DB6PMCD2_STR-DBMSTRTTME sy-vline 
WA_DB6PMCD2_STR-PRGVERS sy-vline 
WA_DB6PMCD2_STR-DL_WT_IEXP sy-vline 
WA_DB6PMCD2_STR-DB_MEMORY sy-vline 
WA_DB6PMCD2_STR-APG_MEM_SZ sy-vline 
WA_DB6PMCD2_STR-GRPHP_RAT sy-vline 
WA_DB6PMCD2_STR-SHEAPTRES sy-vline 
WA_DB6PMCD2_STR-TRACKMOD sy-vline 
WA_DB6PMCD2_STR-OV_LOGPATH sy-vline 
WA_DB6PMCD2_STR-MR_LOGPATH sy-vline 
WA_DB6PMCD2_STR-BLK_LD_FUL sy-vline 
WA_DB6PMCD2_STR-MAXLOG sy-vline 
WA_DB6PMCD2_STR-NUMLOGSP sy-vline 
WA_DB6PMCD2_STR-FAILOVERLOG sy-vline 
WA_DB6PMCD2_STR-ARCHMETH1 sy-vline 
WA_DB6PMCD2_STR-ARCHMETH2 sy-vline 
WA_DB6PMCD2_STR-ARCHMETH1OPT sy-vline 
WA_DB6PMCD2_STR-ARCHMETH2OPT sy-vline 
WA_DB6PMCD2_STR-NUMARCHRETRY sy-vline 
WA_DB6PMCD2_STR-ARCHRETRYDELAY sy-vline 
WA_DB6PMCD2_STR-AUTO_MAINT sy-vline 
WA_DB6PMCD2_STR-AUTO_DB_BACKUP sy-vline 
WA_DB6PMCD2_STR-AUTO_TBL_MAINT sy-vline 
WA_DB6PMCD2_STR-AUTO_RUNSTATS sy-vline 
WA_DB6PMCD2_STR-AUTO_STATS_PROF sy-vline 
WA_DB6PMCD2_STR-AUTO_PROF_UPD sy-vline 
WA_DB6PMCD2_STR-AUTO_REORG sy-vline 
WA_DB6PMCD2_STR-VENDOROPT sy-vline 
WA_DB6PMCD2_STR-AUTO_SWITCHES sy-vline 
WA_DB6PMCD2_STR-HADR_DB_ROLE sy-vline 
WA_DB6PMCD2_STR-HADR_LOCAL_HOST sy-vline 
WA_DB6PMCD2_STR-HADR_LOCAL_SVC sy-vline 
WA_DB6PMCD2_STR-HADR_REMOTE_HOST sy-vline 
WA_DB6PMCD2_STR-HADR_REMOTE_SVC sy-vline 
WA_DB6PMCD2_STR-HADR_REMOTE_INST sy-vline 
WA_DB6PMCD2_STR-HADR_TIMEOUT sy-vline 
WA_DB6PMCD2_STR-HADR_SYNCMODE sy-vline 
WA_DB6PMCD2_STR-PAGESIZE sy-vline 
WA_DB6PMCD2_STR-LOGINDEXBUILD sy-vline 
WA_DB6PMCD2_STR-DFT_MTTB_TYPES sy-vline 
WA_DB6PMCD2_STR-ALT_COLLATE sy-vline 
WA_DB6PMCD2_STR-SELF_TUNING_MEM sy-vline 
WA_DB6PMCD2_STR-RESTRICT_ACCESS sy-vline 
WA_DB6PMCD2_STR-DB_MEM_THRESH sy-vline 
WA_DB6PMCD2_STR-COLLATE_INFO sy-vline 
WA_DB6PMCD2_STR-MIN_DEC_DIVC3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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