Cascading dependencies

i read some about the term 'cascading dependencies' which packages eliminates??? but what is that???
and speaking about packages, is it true that i cannot call a procedure in a remoter database using db links if that particular procedure references a packaged variable???
and what are global variables in a package??? where are they declared in spec or body???

Hi,
Cascading dependencies i will explain you latter. i have to check once.
Regarding your query:
is it true that i cannot call a procedure in a remoter database using db links if that particular procedure references a packaged variable???
It is written very clearly in restrictions on packages that :
You cannot reference remote packaged variables directly or indirectly. For example, you cannot call the following procedure remotely because it references a packaged variable in a parameter initialization clause:
CREATE PACKAGE random AS
seed NUMBER;
PROCEDURE initialize (starter IN NUMBER := seed, ...);
Also, inside a package, you cannot reference host variables.
Regarding your second question :
what are global variables in a package??? where are they declared in spec or body???
Global variables are always defined in specification of a package and advantage of using global variable is that use can use that variable in any where in your application by using package_name.variable_name. They are simply any variable defined in the specification of the package. But Some issues like persistent state has to be keep in mind.

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    <af:column sortProperty="Datqcissueddate" sortable="true"
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    ,p_where varchar2  -- where clause identifying records to be cascade deleted
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      e_bad_params  exception;
      v_iter        number;
      v_plvl        number;
      v_seq_del     number;
      v_max_iter    number := 1000000000;
      function delete_bott_row
      return number
      is
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        v_ppkname    varchar2(30);  -- parent primary key constraint name
        v_ppkcname   varchar2(30);  -- parnet primary key column name
        v_prowid      rowid;
        v_crowid      rowid;
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        v_cfkname    varchar2(30);  -- child foreign key constraint name
        v_cfkcname   varchar2(30);  -- child foreign key column name
        v_ins        number;
        v_seq_ins    number;
        v_sqlerrm    varchar2(4000);
        v_sqlcode    number;
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          dbms_output.put_line('>Child FK name: '||v_cfkname);
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            from user_cons_columns
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                                      where constraint_name=v_cfkname);
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          v_sql := 'insert into to_be_deleted(tname, rid, lvl, seq_ins, flg_del) '||
                   'select '''||v_ctname||''', rowid, '||to_char(v_plvl+1)||', rownum, ''N'' '||
                   'from '||v_ctname||' '||
                   'where '||v_cfkcname||' =any (select '||v_ppkcname||' from '||v_ptname||' where rowid =any (select rid from to_be_deleted where tname = '''||v_ptname||'''))';
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          execute immediate v_sql;
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            from to_be_deleted
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             and tname = v_ctname
             and flg_del = 'N';
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          v_ret_cde := delete_bott_row;
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        when e_max_iter_reached then
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          raise;
        when others then
          raise;
      end delete_bott_row;
    begin
      dbms_output.put_line('Beginning');
      dbms_output.put_line('================================');
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      begin
        select 'Y'
          into dummy
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      exception
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          v_param_val := 2;
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      v_iter := 0;
      v_plvl := 1;
      v_seq_del := 0;
      v_sql := 'insert into to_be_deleted(tname, rid, lvl, seq_ins, flg_del) select '''||upper(p_tname)||''', rowid, '||to_char(v_plvl)||', rownum, ''N'' from '||p_tname||' where '||p_where;
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      dbms_output.put_line('- Calling function delete_bott_row to delete last row of table to_be_deleted');              
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      v_ret_cde :=  delete_bott_row;
      -- dbms_output.put_line('- Back from function delete_bott_row');              
      -- dbms_output.put_line('Return code: '||to_char(v_ret_cde));              
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    show errors
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    -- rollback;Edited by: Rodolfo4 on Mar 23, 2011 10:45 AM

    Interesting.
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    <li>The when others exception at the end should be removed completely</li>
    <li>The when others exception in the middle should be replaced by a specific exception that handles the -2292 error</li>
    <li>A list of tables where no record should be deleted could be usefull. If the logic would encounter such a table, it should also stop. This would be to prevent that data from some system critical tables could be deleted per accident.</li>
    <li>The reference from the FK constraint to the PK constraint should include the table name and if possible the owner (as long as you use user_* views the owner is always the same. But we could extend this to the ALL_* views). I never met a system where different tables have the identical FK constraint names, however just make this fool proof.</li>

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