getTransactionIsolation() in network client should not activate a transaction

• Key: DERBY-2084
• Type: Bug
• Status: Closed
• Resolution: Fixed
• Priority: Major
• Assignee: Bernt M. Johnsen
• Reporter: Bernt M. Johnsen
• Component/s: Network Client
• Affects Version/s: 10.1.3.1, 10.2.1.6, 10.3.1.4
• Fix Version/s: 10.1.3.2, 10.2.2.0, 10.3.1.4

Description

getTransactionIsolation() is implemented by means of
     rs = getTransactionIsolationStmt.executeQuery("values current isolation");

This will activate a transaction. Thus the code snippet

        Connection conn =
            DriverManager.getConnection(url);
        conn.setAutoCommit(false);
        int tx = conn.getTransactionIsolation();
        conn.close();

will fail with

java.sql.SQLException: Cannot close a connection while a transaction is still active.
        at org.apache.derby.client.am.SQLExceptionFactory.getSQLException(Unknown Source)
        at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
        at org.apache.derby.client.am.Connection.closeResourcesX(Unknown Source)
        at org.apache.derby.client.am.Connection.closeX(Unknown Source)
        at org.apache.derby.client.net.NetConnection.closeX(Unknown Source)
        at org.apache.derby.client.am.Connection.close(Unknown Source)
        at org.apache.derby.client.net.NetConnection.close(Unknown Source)
        at GetTransactionIsolation.test(GetTransactionIsolation.java:12)
        at GetTransactionIsolation.main(GetTransactionIsolation.java:22)
Caused by: org.apache.derby.client.am.SqlException: Cannot close a connection while a transaction is still active.
        at org.apache.derby.client.am.Connection.checkForTransactionInProgress(Unknown Source)
        ... 7 more