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Editorial Team
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Asked: 2026-06-13T19:32:13+00:00

I am trying to do a SELECT using PreparedStatement , but not getting any

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I am trying to do a SELECT using PreparedStatement, but not getting any results back, despite the data being present. If I use Statement instead, I get the desired results, so not sure why I don’t get anything with the PreparedStatement.
Any ideas?

Here is my code:

String species = "Snail";
PreparedStatement preparedStatement = con.prepareStatement("Select * from lifeforms where species=?",PreparedStatement.RETURN_GENERATED_KEYS);
preparedStatement.setString(1, species);
preparedStatement.execute();
ResultSet resultSet = preparedStatement.getGeneratedKeys();

Also – I have tried just 

resultSet = preparedStatement.execute();

But this won’t compile, saying I must change resultSet to expect a boolean value.

Any insights into this would be greatly appreciated.

Sorry if this is something obvious, but I have read the docs until I am almost unconscious, and I’m only just learning java.

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1 Answer

  1. Editorial Team

    Ah so I have finally found the answer to this question – in case anyone else is stuck on the same thing..

    The execute() method has no return value, although the compiler was suggesting it expected a boolean return value. Maybe it just returns true or false for successful or not?

    The executeUpdate() method returns an int value of the number of records updated/inserted or deleted.

    To get the result set of a query statement (e.g. Select * from someTable), use the
    ResultSet rs = preparedStatement.executeQuery() method.
    This will return the actual query results into a ResultSet variable.

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