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public class BaseDAO {     public Connection getCon() throws SQLException{      return DBHelper.getCon();     }     public void realse(Connection con) throws SQLException{     DBHelper.realse(con);     }public int execute(String sql) throws SQLException{Connection con = getCon();PreparedStatement stmt = getCon().prepareStatement(sql);stmt.executeUpdate();String res  = stmt.getString(1);realse(con);return res;}}