How to use the loop in BPEL process

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  S.

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• An associative array, how the records using the loop counter?

  In the associative array, how the records using the loop counter? for example
  

  declare
      type population is table of number index by varchar2(64);
      city_population population;   
  begin
      city_population('Samillve') := 200;
      city_population('Lindenhurst') := 300;    
      
      for i in 1 .. city_population.count
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      end loop;
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  /

  That would look like

  SQL> ed
  Wrote file afiedt.buf
  
    1  declare
    2      type population is table of number index by varchar2(64);
    3      city_population population;
    4      l_index varchar2(64);
    5  begin
    6      city_population('Samillve') := 200;
    7      city_population('Lindenhurst') := 300;
    8      l_index := city_population.first;
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   10      loop
   11          dbms_output.put_line(city_population(l_index ));
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   13      end loop;
   14* end;
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  300
  200
  
  PL/SQL procedure successfully completed.
  

  Justin

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  The only legitimate use of goto is when you need to escape from a nested loop.

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  Hello
  
  I get the initial set of values in the Table of Type Records of the Oracle and want to use the list of values in the Select statement.
  
  For example, try something like the following:
  
  TYPE t_record () IS RENDERING
  ID TABLEA.ID%type,
  NO TABLEA.NO%type
  
  );
  v_record t_record;
  T_table TYPE IS the v_record TABLE % TYPE;
  v_table t_table;
  
  -Code to fill the values of v_table here.
  
  SELECT ID, NO, COLLECT in BULK IN < some other table variabes here > FROM TABLEA
  WHERE ID IN (i) v_table USER.USER;
  
  I want to know how to use the Type of Oracle Table values in the Select statement.

  Something like this:

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  /
  
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    from TableA
    FROM TABLEA
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    end loop;
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  No test!

  P;

  Published by: bluefrog on March 5, 2010 17:08

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  Hello
  Using the loop with a query will decrease performance.
  
  for r_row in (select * from table) Loop
  end of loop.
  
  This is done within another loop for, more cases, it returns a single value.
  It will decrease the performance of the procedure.
  kindly advice...
  
  Kind regards
  Balu

  user575682 wrote:
  Using the loop with a query will decrease performance.

  for r_row in (select * from table) Loop
  end of loop.

  This is done within another loop for, more cases, it returns a single value.
  It will decrease the performance of the procedure.

  Perhaps better understand everything that makes this PL/SQL loop construction.

  PL/SQL is two languages. It's PL (logic programming code) like Pascal, C or Java. You can use a 2nd language in it called SQL. The PL engine will be able to recognize when the 2nd language is used. And it compiles all the things that are necessary for motor PL call the SQL engine, pass the data to the SQL engine and get back data, etc. (compare this with the complexity of the use of SQL in Pascal, C or Java language).

  So what's this loop? The PL engine recognizes the SQL SELECT statement. It creates an implicit cursor by calling the SQL engine to analyze (I hope a soft Parser), then run it.

  As part of the loop of the PL, the PL engine now calls the SQL engine to extract data (lines) of the cursor. With 10g and later, the engine of the PL is smart enough to use the implicit treatment in bulk.

  Before 10 g that he used to extract a line from the SQL engine, make the loop, the next line extraction, the loop, etc. In other words, if there is a 1000 lines to pick up, he'll call the SQL engine after 1000.

  With 10g and later he get a 100 lines, which store in a buffer internal and then make the loop once 100. With a 1000 lines to fetch, it requires 10 extractions in bulk instead of one 1000 rank of extractions.

  These extractions require a change of context - as the engine PL must not out back, and in the SQL engine to extract a line. It is an overhead projector and can become so slow the context switch nothing more.

  And it's the construction of bases for this loop (and most other cursor loops) in PL/SQL.

  The ideal is to reduce the number of context switches. It is an overload that can have an impact on performance.

  What about using a loop in a loop. As 'bad '. This example uses the outer loop to retrieve the data. These data are then used to excite the extraction in internal or nested loop. The outside loop draws data from the SQL engine in PL variables Inside loop drives that same data back to the SQL engine.

  Why? It would have been much faster not to pull and push data between the loops using PL.

  It will be much faster do so only through SQL. Write the two loops as a single SQL statement and have the SQL engine directly driving these loops itself. This is called a JOIN in SQL. And the SQL engine can do not only more quickly, but it has a few algorithms of multiplied can be used which are even faster than a nested loop process (called merge joins, hash joins, etc.).

  Bottom line. Optimize SQL. Reduce to a minimum the PL. *

  Do as much of your data, crunch in SQL as possible. SQL is the fastest 'place' and process the data. No PL (or C/Pascal/Java).

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