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From "Thomas Fischer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (TORQUE-123) Statement is left open when Exception is thrown in the QueryDataSet constructor (ORA-01000)
Date Tue, 10 Aug 2010 19:33:16 GMT

    [ https://issues.apache.org/jira/browse/TORQUE-123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12897014#action_12897014
] 

Thomas Fischer commented on TORQUE-123:
---------------------------------------

I'm going to use another patch:
        boolean ok = false;
        try
        {
            stmt = conn.createStatement();
            resultSet = stmt.executeQuery(selectStmt);
            schema = new Schema();
            schema.populate(resultSet.getMetaData(), null);
            ok = true;
        } 
        finally
        {
            if (!ok)
            {
                try
                {
                    close();
                }
                catch (Exception ignored)
                {
                    // ignore as another exception is already thrown
                }
            }
        }

If anyone disagrees please state why

> Statement  is left open when Exception is thrown in the QueryDataSet constructor  (ORA-01000)
> ---------------------------------------------------------------------------------------------
>
>                 Key: TORQUE-123
>                 URL: https://issues.apache.org/jira/browse/TORQUE-123
>             Project: Torque
>          Issue Type: Bug
>          Components: Village
>    Affects Versions: 3.3
>         Environment: OS  :RedHat Enterprise Linux ES 4 update 4
> Java  :1.4.2_08
> Tomcat:4.1.31
> Torque:3.0.2
> JDBC(Oracle): ojdbc.jar(10.2.0.4)
>            Reporter: Kazu Nambo
>            Assignee: Thomas Fischer
>             Fix For: 3.3.1
>
>
> When syntax error(SQLException) happens at executeQuery in the constructor QueryDataSet(Connection
conn, String selectStmt), the member stmt is left open and this problem sometimes results
in ORA-01000 (Maximum open cursors exceeded).
> In the upper layer like BasePeer#executeQuery method, it tries to close QueryDataSet
instance by VillageUtils.close but it fails because the instance is null.
> Other exceptions may result in the same situation.
> If I try to make the constructor more robust as follows, it will work. (No ORA-01000)
>     public QueryDataSet(Connection conn, String selectStmt)
>             throws SQLException, DataSetException
>     {
>         this.conn = conn;
>         selectString = new StringBuffer(selectStmt);
>         try 
>         {
>         	stmt = conn.createStatement();
>         	resultSet = stmt.executeQuery(selectStmt);
>         	schema = new Schema();
>         	schema.populate(resultSet.getMetaData(), null);
>         }
>         catch (Exception e)
>         {
>         	try {
>         		if (null != resultSet) {
>         			resultSet.close();
>         		}
>         	} catch (Exception ignored) {}
>         	try {
>         		if (null != stmt) {
>         			stmt.close();
>         		}
>         	} catch (Exception ignored) {}
>         	if (e instanceof SQLException)
>         		throw (SQLException)e;
>         	else if (e instanceof DataSetException)
>         		throw (DataSetException)e;
>         	else
>         		throw new SQLException("QueryDataSet: exception caught.", e);
>         }
>     }

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