MySQL Result Set - No value specified for parameter 1

Question

I can't figure out what this error means or how to fix it. I'm trying to retrieve some data from one of my databases but keep running into this error message below.

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填写参数

preparedStatement.setLong(1, someIdentifier)

Answer 2

It is maybe because you didn't set parameter for your request:

SELECT * FROM mydatabase WHERE TickerID= ?

You have to add:

preparedStatement.setString(1, "youUserIdValue");

Before to execute the query.

You can also use named parameter:

preparedStatement = connect
        .prepareStatement("SELECT * FROM mydatabase "
                    + " WHERE TickerID=:userID");
preparedStatement.setString("userID", "youUserIdValue");