java - MySQL 结果集 - 没有为参数 1 指定值

Question

我不知道这个错误意味着什么或如何修复它。我正在尝试从我的一个数据库中检索一些数据，但不断遇到下面的错误消息。

preparedStatement = connect
            .prepareStatement("SELECT * FROM mydatabase "
                        + " WHERE TickerID=?");
            resultSet = preparedStatement.executeQuery(); //where it says the error is, line 132
            while(resultSet.next())
            {
                aIDTA = resultSet.getInt("AccountID");
                nameTA = resultSet.getString("Name");
                CashBalance = resultSet.getDouble("CashBalance");
                TradeFeeBuy = resultSet.getDouble("TradeFeeBuy");
                TradeFeeSell = resultSet.getDouble("TradeFeeSell");
                AssetsBalance = resultSet.getDouble("AssetsBalance");
            }



Exception in thread "main" java.sql.SQLException: No value specified for parameter 1
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
    at com.mysql.jdbc.PreparedStatement.checkAllParametersSet(PreparedStatement.java:2281)
    at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:2261)
    at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:2191)
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2004)
    at BuyAndSell.BuyAndSell(BuyAndSell.java:132)
    at Main.main(Main.java:21)

Answer 1

您需要在PreparedStatement中填写参数

preparedStatement.setLong(1, someIdentifier)