java.sql.SQLException : invalid column index

Question

我一直在尝试使用preparedStatement选择数据并传递这些参数，但发生了异常。

有人可以帮助我吗？这是我的代码。

Connection connection = DBConnection.getConnection();
    String query = "select * from integrantes where nome like '?' or rm like '?'";
            ArrayList<Integrante> list = new ArrayList<>();
            try {
                PreparedStatement preparedStatement = connection.prepareStatement(query);
                preparedStatement.setString(1, ('%' + term + '%'));
                preparedStatement.setString(2, ('%' + term + '%'));
                JOptionPane.showMessageDialog(null, ((OraclePreparedStatement) preparedStatement).getOriginalSql());
                ResultSet resultSet = preparedStatement.executeQuery();
                while (resultSet.next()) {
                    list.add(new Integrante(resultSet.getInt(1), resultSet.getString(2), resultSet.getString(3), resultSet.getInt(4)));
                }
            } catch(SQLException e) {
                JOptionPane.showMessageDialog(null, "Erro ao listar o(s) integrante(s)." + e);
            } catch(NullPointerException e) {
                JOptionPane.showMessageDialog(null, "Ocorreu um erro inesperado.");
            } catch(Exception e) {
                JOptionPane.showMessageDialog(null, "Ocorreu um erro no código.");
            }

            return list;

Answer 1

使用 PreparedStatement 时，不得在将要替换为字符串的占位符周围加上引号。您的发言

"select * from integrantes where nome like '?' or rm like '?'"

导致问号被视为文字，因此该语句有零个参数，从而导致异常。将其更改为

"select * from integrantes where nome like ? or rm like ?"