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Problem with move not returning number of rows affected [was: error when using move, any suggestions?]

From: Barry Lind <blind(at)xythos(dot)com>
To: Noel <noel(dot)faux(at)med(dot)monash(dot)edu(dot)au>
Cc: "pgsql-jdbc(at)postgresql(dot)org" <pgsql-jdbc(at)postgresql(dot)org>,pgsql-hackers(at)postgresql(dot)org
Subject: Problem with move not returning number of rows affected [was: error when using move, any suggestions?]
Date: 2002-12-24 17:01:42
Message-ID: 3E0892F6.2070304@xythos.com (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-jdbc
Noel,

I now understand why this is failing.  The following code in 
QueryExecutor.java is having problems:

if (status.startsWith("INSERT") || status.startsWith("UPDATE") || 
status.startsWith("DELETE") || status.startsWith("MOVE"))
{
     update_count = Integer.parseInt(status.substring(1 + 
status.lastIndexOf(' ')));
}

The code is expecting the server to return the keyword MOVE followed by 
the number of rows actually moved.  And on all tests on my databases 
this is always true, move is followed by a number.  However from the 
information you have provided, it seems that on your database the server 
is just returning MOVE without the row count.  At first pass this 
appears to be a bug in the server.  What platform are you running on?

Now the driver could be changed to handle this case, but I'm not exactly 
sure what no value in this case should mean? perhaps 0?

I am cc'ing the hackers mail list to see if perhaps I misunderstand how 
the protocol between client and server is supposed to work in this case.

thanks,
--Barry



Noel wrote:
> Dave,
> 
> Many thanks for your time. Unfortunalty, I'm still getting the same 
> error, even with the code you send, modified to use my database.
> 
> import blastDb.*;
> import java.sql.*;
> import java.io.*;
> import java.util.*;
> import java.lang.*;
> 
> public class TestFetchSize{
>    public static void main(String[] args){
>        Connection connection = null;
>        ResultSet rs;
>        try{
>            connection = new BlastDB().connection;
>            connection.setAutoCommit(false);                      
> Statement stmt = connection.createStatement();
>            int counte = 0;
>            int result = stmt.executeUpdate("declare test cursor for 
> select id from region " +
>                    "where protein_database = 1");
>            System.out.println("Cursor created, result is: " + result);
>            result = stmt.executeUpdate("move forward 99 in test");
>            System.out.println("Moved 99, result is: " + result);
>            while(true){
>                rs = stmt.executeQuery("fetch forward 2 in test");
>                if (rs.next()){
>                    ++counte;
>                    while (rs.next()){
>                        ++counte;
>                        System.out.println("Id --> " + 
> rs.getObject(1).toString());
>                    }
>                }
>                else
>                    break;
>            }
>            System.out.println(counte);
>            rs.close();
>            connection.commit();
>            connection.close();
>        }
>        catch (Exception e) {
>            e.printStackTrace();
>            System.out.println(e.getMessage());
>        }
>        finally{
>            try{
>                if(null != connection)
>                    connection.close();
>            }
>            catch(Exception e) {}
>        }
>    }
> }
> 
> With the move statement commented out it works fine.
> The database is running on an IBM server with 4 Intel(R) Xeon(TM) CPU 
> 1.40GHz.
> The programe is running on a 1.2Ghz Athon machine with debin linux and 
> 1Gig Ram.
> I don't know if this helps at all.
> Is there anyother info which may help you??
> Once again many thanks for your help.
> Noel
> 
>> Noel,
>>
>> Ok, I have some test code that works
>>
>>  public CursorTest()
>>  {
>>    Connection con = null;
>>    ResultSet rs;
>>    try{
>>      con = getConnection();
>>      con.setAutoCommit( false );
>>      Statement stmt = con.createStatement();
>>
>>      int result = stmt.executeUpdate( "declare test cursor for select *
>> from orders" );
>>      System.out.println( "Created cursor, result is " + result );
>>      result = stmt.executeUpdate( "move 5 in test");
>>      System.out.println( "Moved " + result );
>>      for(;;)
>>      {
>>     rs = stmt.executeQuery("fetch forward 5 in test");
>>        if ( !rs.next() )
>>       break;
>>      }
>>
>>      while(rs.next()){
>>        System.out.println("Id -->" + rs.getObject(1).toString());
>>      }
>>      rs.close();
>>      con.commit();
>>      con.close();
>>    }catch (Exception ex){
>>      ex.printStackTrace();
>>    }finally{
>>      try{
>>        if (null != con) con.close();
>>      }catch(Exception ex){}
>>    }
>>  }
>>
>> note the fetch is actually going to return the result set, so you have
>> to do rs=executeQuery( "fetch ..." )
>>
>> Dave
>> On Thu, 2002-12-19 at 19:48, Noel wrote:
>>  
>>
>>> Dave,
>>> Thanks for taking the time to look at the problem. I tried the 
>>> stmt.executeUpdate. It also gave the same error.
>>>
>>> Once again, thanks
>>> Noel
>>>
>>>   
>>>
>>>> Noel,
>>>>
>>>> Ok, sorry, jdbc is getting in the way here. I haven't got time right
>>>> now, so if you can't wait try changing the stmt.execute to
>>>> stmt.executeUpdate, and see what happens. I will try to figure it out
>>>> later though.
>>>>
>>>> Dave
>>>> On Wed, 2002-12-18 at 23:51, Noel wrote:
>>>>
>>>>
>>>>     
>>>>
>>>>> Hi Dave,
>>>>>
>>>>> I modified the small program to reflect the statement I performed 
>>>>> in psql:
>>>>>
>>>>> import blastDb.*;
>>>>> import java.sql.*;
>>>>> import java.io.*;
>>>>> import java.util.*;
>>>>> import java.lang.*;
>>>>>
>>>>> public class TestFetchSize
>>>>> {
>>>>>   public static void main(String[] args)
>>>>>   {
>>>>>       try
>>>>>       {
>>>>>           BlastDB db = new BlastDB();
>>>>>                    Statement stmt = db.connection.createStatement();
>>>>>           int counte = 0;
>>>>>           stmt.execute("begin work");
>>>>>           stmt.execute("declare test cursor for select id from 
>>>>> region where protein_database = 1");
>>>>>           ResultSet rs;
>>>>>           System.out.println("here1");
>>>>>           stmt.execute("move forward 99 in test");
>>>>>           System.out.println("here2");
>>>>>           while(stmt.execute("fetch forward 2 in test"))
>>>>>           {
>>>>>               rs = stmt.getResultSet();
>>>>>               if (rs.next())
>>>>>               {
>>>>>                   ++counte;
>>>>>                   while (rs.next())
>>>>>                   {
>>>>>                       ++counte;
>>>>>                   }
>>>>>               }
>>>>>               else
>>>>>                   break;
>>>>>                        }
>>>>>
>>>>>           rs = stmt.getResultSet();
>>>>>           if (rs.next())
>>>>>               System.out.println("ok");
>>>>>           else
>>>>>               System.out.println("NO");
>>>>>           System.out.println(counte);
>>>>>           stmt.execute("end work");
>>>>>       }
>>>>>       catch (Exception e)
>>>>>       {
>>>>>           e.printStackTrace();
>>>>>           System.out.println(e.getMessage());
>>>>>       }
>>>>>   }
>>>>> }
>>>>>
>>>>> This is the out put, the same error as before :(
>>>>> here1
>>>>> Unable to fathom update count MOVE
>>>>>       at 
>>>>> org.postgresql.core.QueryExecutor.receiveCommandStatus(QueryExecutor.java:182) 
>>>>>
>>>>>       at 
>>>>> org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:80)
>>>>>       at org.postgresql.Connection.ExecSQL(Connection.java:398)
>>>>>       at org.postgresql.jdbc2.Statement.execute(Statement.java:130)
>>>>>       at TestFetchSize.main(TestFetchSize.java:21)
>>>>> Unable to fathom update count MOVE
>>>>>
>>>>> So the programe is not moving beyound the move statement.
>>>>>
>>>>> Many thanks
>>>>> Noel
>>>>>
>>>>> P.S. Is this sim to the INSERT problem with the sim error message?
>>>>>
>>>>>
>>>>> Dave Cramer wrote:
>>>>>
>>>>>  
>>>>>       
>>>>>
>>>>>> Noel,
>>>>>>
>>>>>> Well, your sql in the driver was fetch forward 2000 in test, does 
>>>>>> that
>>>>>> work?
>>>>>>
>>>>>> It shouldn't be a driver error, the driver just passes sql through.
>>>>>>
>>>>>> Dave
>>>>>> On Wed, 2002-12-18 at 20:51, Noel Faux wrote:
>>>>>>
>>>>>>
>>>>>>    
>>>>>>         
>>>>>>
>>>>>>> Hi Dave,
>>>>>>>
>>>>>>> It works fine in psql:
>>>>>>> blast=# begin;
>>>>>>> BEGIN
>>>>>>> blast=# declare test cursor for select id from region where
>>>>>>> protein_database = 1;
>>>>>>> SELECT
>>>>>>> blast=# move forward 99 in test;
>>>>>>> MOVE
>>>>>>> blast=# fetch forward 2 in test;
>>>>>>> id
>>>>>>> --------
>>>>>>> 486175
>>>>>>> 481881
>>>>>>> (2 rows)
>>>>>>>
>>>>>>> Is this a driver error?
>>>>>>> Thanks for your reply
>>>>>>> Cheers
>>>>>>> Noel
>>>>>>>
>>>>>>> Noel Faux
>>>>>>> Department of Biochemistry and Molecluar Biology
>>>>>>> Monash University
>>>>>>> Clayton 3168
>>>>>>> Victoria
>>>>>>> Australia
>>>>>>>
>>>>>>> ----- Original Message -----
>>>>>>> From: Dave Cramer <Dave(at)micro-automation(dot)net>
>>>>>>> Date: Wednesday, December 18, 2002 9:43 pm
>>>>>>> Subject: Re: [JDBC] error when using move, any suggestions?
>>>>>>>
>>>>>>>  
>>>>>>>
>>>>>>>      
>>>>>>>           
>>>>>>>
>>>>>>>> Noel,
>>>>>>>>
>>>>>>>> What do you get from the server when you try the same commands 
>>>>>>>> in psql?
>>>>>>>> I just tried it and it works fine?
>>>>>>>>
>>>>>>>> test=# begin;
>>>>>>>> BEGIN
>>>>>>>> test=# declare test cursor for select id from address ;
>>>>>>>> DECLARE CURSOR
>>>>>>>> test=# move forward 99 in test;
>>>>>>>> MOVE 1
>>>>>>>> test=# fetch forward 2000 in test;
>>>>>>>> id
>>>>>>>> ----
>>>>>>>> (0 rows)
>>>>>>>>
>>>>>>>> Dave
>>>>>>>>
>>>>>>>> On Wed, 2002-12-18 at 00:30, Noel wrote:
>>>>>>>>   
>>>>>>>>        
>>>>>>>>             
>>>>>>>>
>>>>>>>>> Hi all,
>>>>>>>>> I'm new to postgreSQL.
>>>>>>>>> I wrote a little test program to learn how to use fetch and 
>>>>>>>>> move     
>>>>>>>>>          
>>>>>>>>>               
>>>>>>>>
>>>>>>>> in   
>>>>>>>>        
>>>>>>>>             
>>>>>>>>
>>>>>>>>> postgreSQL.
>>>>>>>>>
>>>>>>>>> import blastDb.*;
>>>>>>>>> import java.sql.*;
>>>>>>>>> import java.io.*;
>>>>>>>>> import java.util.*;
>>>>>>>>> import java.lang.*;
>>>>>>>>>
>>>>>>>>> public class TestFetchSize
>>>>>>>>> {
>>>>>>>>>     public static void main(String[] args)
>>>>>>>>>     {
>>>>>>>>>             try
>>>>>>>>>             {
>>>>>>>>>                     BlastDB db = new BlastDB();
>>>>>>>>>                                         Statement stmt 
>>>>>>>>> =db.connection.createStatement();
>>>>>>>>>                     int counte = 0;
>>>>>>>>>                     stmt.execute("begin work");
>>>>>>>>>                     stmt.execute("declare test cursor for 
>>>>>>>>> select id     
>>>>>>>>>          
>>>>>>>>>               
>>>>>>>>
>>>>>>>> from region where 
>>>>>>>
>>>>>>>      
>>>>>>>           
>>>>>>>
>>>>>>>>   
>>>>>>>>        
>>>>>>>>             
>>>>>>>>
>>>>>>>>> protein_database = 1");
>>>>>>>>>                     ResultSet rs;
>>>>>>>>>                     stmt.execute("move forward 99 in test");
>>>>>>>>>                     while(stmt.execute("fetch forward 2000 in 
>>>>>>>>> test"))
>>>>>>>>>                     {
>>>>>>>>>                             rs = stmt.getResultSet();
>>>>>>>>>                             if (rs.next())
>>>>>>>>>                             {
>>>>>>>>>                                     ++counte;
>>>>>>>>>                                     while (rs.next())
>>>>>>>>>                                     {
>>>>>>>>>                                             ++counte;
>>>>>>>>>                                     }
>>>>>>>>>                             }
>>>>>>>>>                             else
>>>>>>>>>                                     break;
>>>>>>>>>                                                 }
>>>>>>>>>                     System.out.println(counte);
>>>>>>>>>                     stmt.execute("end work");
>>>>>>>>>             }
>>>>>>>>>             catch (Exception e)
>>>>>>>>>             {
>>>>>>>>>                     e.printStackTrace();
>>>>>>>>>                     System.out.println(e.getMessage());
>>>>>>>>>             }
>>>>>>>>>     }
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> It compiles ok, however when run i get this message:
>>>>>>>>> Unable to fathom update count MOVE
>>>>>>>>> at
>>>>>>>>>     
>>>>>>>>>          
>>>>>>>>>               
>>>>>>>
>>>>>>> org.postgresql.core.QueryExecutor.receiveCommandStatus(QueryExecutor.java:182)> 
>>>>>>>
>>>>>>> at org.postgresql.core.QueryExecutor.execute(QueryExecutor.java:80)
>>>>>>>  
>>>>>>>
>>>>>>>      
>>>>>>>           
>>>>>>>
>>>>>>>>> at org.postgresql.Connection.ExecSQL(Connection.java:398)
>>>>>>>>> at org.postgresql.jdbc2.Statement.execute(Statement.java:130)
>>>>>>>>> at TestFetchSize.main(TestFetchSize.java:25)
>>>>>>>>> Unable to fathom update count MOVE
>>>>>>>>>
>>>>>>>>> I've search the web and the archives, and the only thing close 
>>>>>>>>>     
>>>>>>>>>          
>>>>>>>>>               
>>>>>>>>
>>>>>>>> is the   
>>>>>>>>        
>>>>>>>>             
>>>>>>>>
>>>>>>>>> thread about a sim problem with INSERT:
>>>>>>>>> "Basically the driver was storing the oid in an int.  The value 
>>>>>>>>>     
>>>>>>>>>          
>>>>>>>>>               
>>>>>>>>
>>>>>>>> you have
>>>>>>>>   
>>>>>>>>        
>>>>>>>>             
>>>>>>>>
>>>>>>>>> is overflowing the value allowed for a signed int.
>>>>>>>>>
>>>>>>>>> thanks,
>>>>>>>>> --Barry "
>>>>>>>>>
>>>>>>>>> Is this the same problem ?
>>>>>>>>> Using  7.4 divers with JDBC3 support.
>>>>>>>>>
>>>>>>>>> Cheers
>>>>>>>>> Noel
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> ---------------------------(end of broadcast)--------------------
>>>>>>>>>     
>>>>>>>>>          
>>>>>>>>>               
>>>>>>>>
>>>>>>>> -------
>>>>>>>>   
>>>>>>>>        
>>>>>>>>             
>>>>>>>>
>>>>>>>>> TIP 4: Don't 'kill -9' the postmaster
>>>>>>>>>     
>>>>>>>>>          
>>>>>>>>>               
>>>>>>>>
>>>>>>>> -- 
>>>>>>>> Dave Cramer <Dave(at)micro-automation(dot)net>
>>>>>>>>
>>>>>>>>
>>>>>>>> ---------------------------(end of broadcast)----------------------
>>>>>>>> -----
>>>>>>>> TIP 2: you can get off all lists at once with the unregister 
>>>>>>>> command
>>>>>>>> (send "unregister YourEmailAddressHere" to 
>>>>>>>> majordomo(at)postgresql(dot)org)
>>>>>>>>   
>>>>>>>>        
>>>>>>>>             
>>>>>>>
>>>>>>> ---------------------------(end of 
>>>>>>> broadcast)---------------------------
>>>>>>> TIP 6: Have you searched our list archives?
>>>>>>>
>>>>>>> http://archives.postgresql.org
>>>>>>>  
>>>>>>>
>>>>>>>      
>>>>>>>           
> 
> 
> 
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