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Date: Wed, 7 Mar 2007 08:07:24 -0800 (PST)
From: "Daniel John Debrunner (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Created: (DERBY-2413) Derby allows duplicate cursor names
 for open PreparedStatements.
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Derby allows duplicate cursor names for open PreparedStatements.
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                 Key: DERBY-2413
                 URL: https://issues.apache.org/jira/browse/DERBY-2413
             Project: Derby
          Issue Type: Bug
          Components: JDBC, Network Client
    Affects Versions: 10.2.2.0, 10.2.1.6, 10.1.3.1, 10.1.2.1, 10.1.1.0, 10.0.2.1
            Reporter: Daniel John Debrunner
            Priority: Minor


The following code does not throw any exception in embedded and client: The second setCursorName should throw an exception.

        PreparedStatement ps1 = prepareStatement("SELECT I FROM T FOR UPDATE");
        ps1.setCursorName("TEST_DUP");
        
        PreparedStatement ps2 = prepareStatement("SELECT C FROM T FOR UPDATE");
        ps1.setCursorName("TEST_DUP");

If a prepare of a statement corresponds to a DECLARE CURSOR in SQL, then it would seem that only one DECLARE can exist at any time with a given name.
14.1 SR 1a) states this for a DECLARE in a SQL client module, but seems to be silent as to what is required when the declare is not a a module definition.
Though the SQL OPEN call must go against a single DECLARE.

The javadoc for Statement.setCursorName says the cursor name must be unique within the connection.

Derby does detect duplicate names for open cursors (ResultSets) within a connection.

Existing application impact is a program is using duplicate names for different open statement objects will hit exceptions if this is fixed.

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