Unsupported method: ResultSet.first问题,我已设Statement stmt
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE );

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If a driver implements the cursor movement methods in the JDBC 2.0 core API, its result sets can be scrollable. A scrollable result set's cursor can move both forward and backward as well as to a particular row. The following methods move the cursor backward, to the first row, to the last row, to a particular row number