ABAP Select data from SAP table CNVPERFDB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNVPERFDB
*  INTO TABLE @DATA(IT_CNVPERFDB2).
*--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_CNVPERFDB INDEX 1 INTO DATA(WA_CNVPERFDB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNVPERFDB>-MANDT = 1.
<CNVPERFDB>-PACKID = 1.
<CNVPERFDB>-CUSTNUMMER = 1.
<CNVPERFDB>-INSTNR = 1.
<CNVPERFDB>-SYSID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNVPERFDB-CLIENT, sy-vline,
  WA_CNVPERFDB-ANALYSETYP, sy-vline,
  WA_CNVPERFDB-ANALYSEDATE, sy-vline,
  WA_CNVPERFDB-CUSTNAME, sy-vline,
  WA_CNVPERFDB-SAPRL, sy-vline,
  WA_CNVPERFDB-DBSYS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNVPERFDB 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_CNVPERFDB 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_CNVPERFDB INTO WA_CNVPERFDB.


*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_CNVPERFDB_STR, 
MANDT TYPE STRING,
PACKID TYPE STRING,
CUSTNUMMER TYPE STRING,
INSTNR TYPE STRING,
SYSID TYPE STRING,
CLIENT TYPE STRING,
ANALYSETYP TYPE STRING,
ANALYSEDATE TYPE STRING,
CUSTNAME TYPE STRING,
SAPRL TYPE STRING,
DBSYS TYPE STRING,
OPSYS TYPE STRING,
SYSTEMTYP TYPE STRING,
PRODCLIENT TYPE STRING,
DBSIZE TYPE STRING,
MEMSIZE TYPE STRING,
CPUNR TYPE STRING,
ARCHIVEMODE TYPE STRING,
ESTRECORDS TYPE STRING,
ESTIMTIME TYPE STRING,
JOBNR TYPE STRING,
UPDATETIME TYPE STRING,
THROUGHPUT TYPE STRING,
IDLE TYPE STRING,
PAGING TYPE STRING,
CHKPOINT TYPE STRING,
BATCH TYPE STRING,
WPTOT TYPE STRING,
UPDPROC TYPE STRING,
NETTORUNTIME TYPE STRING,
RECSELECT TYPE STRING,
RECRELEV TYPE STRING,
RECUPD TYPE STRING,
PROC_MAX TYPE STRING,
AU TYPE STRING,
AU_CLU TYPE STRING,
AD TYPE STRING,
AD_CLU TYPE STRING,
AI TYPE STRING,
AI_CLU TYPE STRING,
DAI TYPE STRING,
DAI_CLU TYPE STRING,
DROP_AI TYPE STRING,
EU TYPE STRING,
SUMUP TYPE STRING,
PRIO TYPE STRING,
DUM TYPE STRING,
UNAME TYPE STRING,
DESCRIPTION TYPE STRING,
REMARKS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNVPERFDB_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_CNVPERFDB_STR-MANDT sy-vline 
WA_CNVPERFDB_STR-PACKID sy-vline 
WA_CNVPERFDB_STR-CUSTNUMMER sy-vline 
WA_CNVPERFDB_STR-INSTNR sy-vline 
WA_CNVPERFDB_STR-SYSID sy-vline 
WA_CNVPERFDB_STR-CLIENT sy-vline 
WA_CNVPERFDB_STR-ANALYSETYP sy-vline 
WA_CNVPERFDB_STR-ANALYSEDATE sy-vline 
WA_CNVPERFDB_STR-CUSTNAME sy-vline 
WA_CNVPERFDB_STR-SAPRL sy-vline 
WA_CNVPERFDB_STR-DBSYS sy-vline 
WA_CNVPERFDB_STR-OPSYS sy-vline 
WA_CNVPERFDB_STR-SYSTEMTYP sy-vline 
WA_CNVPERFDB_STR-PRODCLIENT sy-vline 
WA_CNVPERFDB_STR-DBSIZE sy-vline 
WA_CNVPERFDB_STR-MEMSIZE sy-vline 
WA_CNVPERFDB_STR-CPUNR sy-vline 
WA_CNVPERFDB_STR-ARCHIVEMODE sy-vline 
WA_CNVPERFDB_STR-ESTRECORDS sy-vline 
WA_CNVPERFDB_STR-ESTIMTIME sy-vline 
WA_CNVPERFDB_STR-JOBNR sy-vline 
WA_CNVPERFDB_STR-UPDATETIME sy-vline 
WA_CNVPERFDB_STR-THROUGHPUT sy-vline 
WA_CNVPERFDB_STR-IDLE sy-vline 
WA_CNVPERFDB_STR-PAGING sy-vline 
WA_CNVPERFDB_STR-CHKPOINT sy-vline 
WA_CNVPERFDB_STR-BATCH sy-vline 
WA_CNVPERFDB_STR-WPTOT sy-vline 
WA_CNVPERFDB_STR-UPDPROC sy-vline 
WA_CNVPERFDB_STR-NETTORUNTIME sy-vline 
WA_CNVPERFDB_STR-RECSELECT sy-vline 
WA_CNVPERFDB_STR-RECRELEV sy-vline 
WA_CNVPERFDB_STR-RECUPD sy-vline 
WA_CNVPERFDB_STR-PROC_MAX sy-vline 
WA_CNVPERFDB_STR-AU sy-vline 
WA_CNVPERFDB_STR-AU_CLU sy-vline 
WA_CNVPERFDB_STR-AD sy-vline 
WA_CNVPERFDB_STR-AD_CLU sy-vline 
WA_CNVPERFDB_STR-AI sy-vline 
WA_CNVPERFDB_STR-AI_CLU sy-vline 
WA_CNVPERFDB_STR-DAI sy-vline 
WA_CNVPERFDB_STR-DAI_CLU sy-vline 
WA_CNVPERFDB_STR-DROP_AI sy-vline 
WA_CNVPERFDB_STR-EU sy-vline 
WA_CNVPERFDB_STR-SUMUP sy-vline 
WA_CNVPERFDB_STR-PRIO sy-vline 
WA_CNVPERFDB_STR-DUM sy-vline 
WA_CNVPERFDB_STR-UNAME sy-vline 
WA_CNVPERFDB_STR-DESCRIPTION sy-vline 
WA_CNVPERFDB_STR-REMARKS sy-vline      INTO ld_text SEPARATED BY SPACE.

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