ABAP Select data from SAP table ISMAINTPLANMAINTCALLTP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISMAINTPLANMAINTCALLTP
*  INTO TABLE @DATA(IT_ISMAINTPLANMAINTCALLTP2).
*--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_ISMAINTPLANMAINTCALLTP INDEX 1 INTO DATA(WA_ISMAINTPLANMAINTCALLTP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISMAINTPLANMAINTCALLTP>-KEY = 1.
<ISMAINTPLANMAINTCALLTP>-PARENT_KEY = 1.
<ISMAINTPLANMAINTCALLTP>-ROOT_KEY = 1.
<ISMAINTPLANMAINTCALLTP>-MAINTENANCEPLAN = 1.
<ISMAINTPLANMAINTCALLTP>-MAINTENANCEPLANCALLNUMBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISMAINTPLANMAINTCALLTP-SCHEDULINGTYPE, sy-vline,
  WA_ISMAINTPLANMAINTCALLTP-SCHEDULINGSTATUS, sy-vline,
  WA_ISMAINTPLANMAINTCALLTP-MEASURINGPOINT, sy-vline,
  WA_ISMAINTPLANMAINTCALLTP-MAINTENANCETASKPERFORMANCEUNIT, sy-vline,
  WA_ISMAINTPLANMAINTCALLTP-MAINTENANCECALLNEXTPLANNEDDATE, sy-vline,
  WA_ISMAINTPLANMAINTCALLTP-MAINTENANCECALLDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISMAINTPLANMAINTCALLTP 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_ISMAINTPLANMAINTCALLTP 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_ISMAINTPLANMAINTCALLTP INTO WA_ISMAINTPLANMAINTCALLTP.


*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.

*Conversion exit ALPHA, internal->external for field MAINTENANCEPLAN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISMAINTPLANMAINTCALLTP-MAINTENANCEPLAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISMAINTPLANMAINTCALLTP-MAINTENANCEPLAN.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ISMAINTPLANMAINTCALLTP_STR, 
KEY TYPE STRING,
PARENT_KEY TYPE STRING,
ROOT_KEY TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
MAINTENANCEPLANCALLNUMBER TYPE STRING,
SCHEDULINGTYPE TYPE STRING,
SCHEDULINGSTATUS TYPE STRING,
MEASURINGPOINT TYPE STRING,
MAINTENANCETASKPERFORMANCEUNIT TYPE STRING,
MAINTENANCECALLNEXTPLANNEDDATE TYPE STRING,
MAINTENANCECALLDATE TYPE STRING,
COMPLETIONDATE TYPE STRING,
COMPLETIONTIME TYPE STRING,
CYCLESETSEQUENCE TYPE STRING,
MAINTCALLCOMPLTNCNTRRDNG TYPE STRING,
MAINTCALLNEXTPLNDCNTRRDNG TYPE STRING,
MAINTENANCECALLISOUTSTANDING TYPE STRING,
MAINTCALLISINVOKEDONPLNDDATE TYPE STRING,
MAINTCALLHORIZONISNOTREACHED TYPE STRING,
RELEASEDBYUSERNAME TYPE STRING,
USERDESCRIPTION TYPE STRING,
MAINTPLNCNCTNTDDUEPACKAGESTXT TYPE STRING,
MAINTCALLCOMPLTNDATEVARIANCE TYPE STRING,
MAINTPLANLASTSCHEDULEDDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISMAINTPLANMAINTCALLTP_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_ISMAINTPLANMAINTCALLTP_STR-KEY sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-PARENT_KEY sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-ROOT_KEY sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTENANCEPLAN sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTENANCEPLANCALLNUMBER sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-SCHEDULINGTYPE sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-SCHEDULINGSTATUS sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MEASURINGPOINT sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTENANCETASKPERFORMANCEUNIT sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTENANCECALLNEXTPLANNEDDATE sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTENANCECALLDATE sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-COMPLETIONDATE sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-COMPLETIONTIME sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-CYCLESETSEQUENCE sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTCALLCOMPLTNCNTRRDNG sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTCALLNEXTPLNDCNTRRDNG sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTENANCECALLISOUTSTANDING sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTCALLISINVOKEDONPLNDDATE sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTCALLHORIZONISNOTREACHED sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-RELEASEDBYUSERNAME sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-USERDESCRIPTION sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTPLNCNCTNTDDUEPACKAGESTXT sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTCALLCOMPLTNDATEVARIANCE sy-vline 
WA_ISMAINTPLANMAINTCALLTP_STR-MAINTPLANLASTSCHEDULEDDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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