java sql语法错误选择

Question

这个问题已经有答案了:

preparedStatement syntax error (2 个回答)

已关闭 4 年前。

所以我有这段代码，它应该为我提供行的 id。

public int getIdSala(Connection conn, String t) {
    try {
        String query = "Select id_sala from sala where nume = ?";

        PreparedStatement st = conn.prepareStatement(query);
        st.setString(1, t);
        ResultSet rs = st.executeQuery(query);

        id = rs.getInt("Id_sala");

    } catch (Exception e) {
        System.err.println("Got an exception!");
        System.err.println(e.getMessage());
    }
    return id;
}

我收到以下错误:

You have an error in your SQL syntax; check the manual that corresponds to your MySQLserver version for the right syntax to use near '?' at line 1

可能是什么问题？

Answer 1

不要执行st.executeQuery(query)，而只执行st.executeQuery()