Add support for CLOB attributes in DerbyPlugIn

Fetching data from CLOB attributes always returns null when using the Derby database. This patch returns a java.sql.Clob or the String representation of the CLOB column in the result set.

Frameworks/PlugIns/DerbyPlugIn/Sources/com/webobjects/jdbcadaptor/_DerbyPlugIn.java

@@ -4,6 +4,9 @@
 import java.io.InputStream;
 import java.lang.reflect.Method;
 import java.math.BigDecimal;
+import java.sql.Clob;
+import java.sql.ResultSet;
+import java.sql.SQLException;
 import java.sql.Timestamp;
 
 import com.webobjects.eoaccess.EOAdaptor;
@@ -380,6 +383,21 @@ public Class defaultExpressionClass() {
 		return DerbyExpression.class;
 	}
 
+	@Override
+	public Object fetchCLOB(ResultSet resultSet, int column, EOAttribute attribute, boolean materialize) throws SQLException {
+		Clob clob = resultSet.getClob(column);
+
+		if (clob == null) {
+	      return null;
+	    }
+
+	    if (!materialize) {
+	      return clob;
+	    }
+
+	    return clob.getSubString(1L, (int)clob.length());
+	}
+
 	/**
 	 * This is usually extracted from the the database using JDBC, but this is
 	 * really inconvenient for users who are trying to generate SQL at some. A