ResultSet overflows when rows are inserted.

• Key: DERBY-585
• Type: Bug
• Status: Closed
• Resolution: Duplicate
• Priority: Major
• Assignee: Bryan Pendleton
• Reporter: Thierry de Pretto
• Component/s: JDBC, Network Client
• Affects Version/s: 10.1.1.0
• Fix Version/s: 10.2.1.6

Description

Derby jdbc driver doesn't seem to be able to find the end of a
ResultSet when rows are inserted while the ResultSet is walked. For
instance, the execution of the code


import java.sql.Connection;
import java.sql.Statement;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.ResultSet;
import java.sql.DriverManager;

public class Test
{
    public static void main(String[] pArgs) throws Exception
    {
        Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
        String url = "jdbc:derby://localhost:1527/sample";
// Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
// String url = "jdbc:derby:/tmp/sample;create=true";
        Connection conn = DriverManager.getConnection(url);
        Statement s = conn.createStatement();
        try
        {
            s.execute("drop table q");
        }
        catch (Exception e)
        {
            System.out.println(e.toString());
        }
        try
        {
            s.execute("create table q(q integer)");
        }
        catch (Exception e)
        {
            System.out.println(e.toString());
        }
        PreparedStatement p = conn.prepareStatement("insert into q values (1)");
// for (int i = 0; i<=10; i++) { p.executeUpdate();} // it works for small table.
        for (int i = 0; i<=10000; i++) { p.executeUpdate();} // it never ends for big table.
        conn.commit();
        ResultSet rs = s.executeQuery("SELECT q FROM q");
        System.out.println("q, w");
        while (rs.next()) {
            int q = rs.getInt("q");
            System.out.println(""+ q);
            conn.createStatement().execute("insert into q values (2)");
        }
        rs.close();
        s.close();
    }
}


ends with exception


Exception in thread "main" org.apache.derby.client.am.SqlException: Run out of sections to use,sections limited to 32k currently
at org.apache.derby.client.am.SectionManager.getSection(Unknown Source)
at org.apache.derby.client.am.SectionManager.getDynamicSection(Unknown Source)
at org.apache.derby.client.am.Statement.flowExecute(Unknown Source)
at org.apache.derby.client.am.Statement.executeX(Unknown Source)
at org.apache.derby.client.am.Statement.execute(Unknown Source)
at Test.main(Test.java:95)

if table q is big enough because ResultSet.next() seems to retrieve
the rows inserted after the select execution. Note that it also occurs
for join statement.