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From "Andreas Korneliussen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-795) After calling ResultSet.relative(0) the cursor loses its position
Date Thu, 09 Feb 2006 13:47:59 GMT
     [ http://issues.apache.org/jira/browse/DERBY-795?page=all ]

Andreas Korneliussen updated DERBY-795:
---------------------------------------

    Attachment: DERBY-795.stat

> After calling ResultSet.relative(0) the cursor loses its position
> -----------------------------------------------------------------
>
>          Key: DERBY-795
>          URL: http://issues.apache.org/jira/browse/DERBY-795
>      Project: Derby
>         Type: Bug
>   Components: JDBC
>     Versions: 10.1.2.1
>  Environment: Any
>     Reporter: Andreas Korneliussen
>     Assignee: Andreas Korneliussen
>     Priority: Minor
>  Attachments: DERBY-795.diff, DERBY-795.stat
>
> After calling rs.relative(0), on a scrollable ResultSet, the cursor looses its position,
and a rs.getXXX(..) fails with:
> SQL Exception: Invalid cursor state - no current row.
> Probably caused by the following logic in ScrollInsensitiveResultSet.getRelativeRow(int
row):
> 	// Return the current row for 0
> 		if (row == 0)
> 		{
>                     if ((beforeFirst || afterLast) ||
>                         (!beforeFirst && !afterLast)) {
>                         return null;
>                     } else {
> 			return getRowFromHashTable(currentPosition);
>                     }
> 		}
> The if () will always evaluate to true, regardless of the values of beforeFirst and afterLast
> Test code:
> import java.sql.Connection;
> import java.sql.DriverManager;
> import java.sql.ResultSet;
> import java.sql.SQLException;
> import java.sql.Statement;
> public class RelativeZeroIssue {
>         
>     public static void main(String[] args) throws Exception {
>         
>         Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
>         Connection con = DriverManager.getConnection("jdbc:derby:testdb2;create=true");
>         con.setAutoCommit(false);
>         try {    
>             Statement statement = con.createStatement();
>             
>             /** Create the table */
>             statement.execute("create table t1(id int)");
>             statement.execute("insert into t1 values 1,2,3,4,5,6,7,8");
>             
>             Statement s = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
>                     ResultSet.CONCUR_READ_ONLY);
>             ResultSet rs = s.executeQuery("select * from t1");
>             rs.next();
>             System.out.println(rs.getInt(1));
>             System.out.println(rs.relative(0));
>             System.out.println(rs.getInt(1));
>         }  finally {
>             
>             con.rollback();
>             con.close();
>         }
>     }
>   
> }
> Output from test:
> 1
> false
> Exception in thread "main" SQL Exception: Invalid cursor state - no current row.
>         at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.Util.newEmbedSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.Util.generateCsSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedConnection.newSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.ConnectionChild.newSQLException(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedResultSet.checkOnRow(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedResultSet.getColumn(Unknown Source)
>         at org.apache.derby.impl.jdbc.EmbedResultSet.getInt(Unknown Source)
>         at derbytest.RelativeZeroIssue.main(RelativeZeroIssue.java:51)
> Java Result: 1

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