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    <p>I'm little confused from what are you trying to achieve but i guess you need this:</p> <pre><code>select * from city as c inner join user as u on (c.ID = u.city_ID) where u.name = ?; </code></pre> <p>Then you need only execute this one query and you have desired results.</p> <p>But also as @dystroy mentioned if you want to use your approach you need at first fetch ids from User into some <code>List&lt;Integer&gt;</code> and then create some <code>List&lt;String&gt;</code> that will hold your queries or use <code>IN</code> clause in your query.</p> <p><strong>Pseudo-code:</strong></p> <pre><code>// getting ids from User List&lt;Integer&gt; cityIds = new ArrayList&lt;Integer&gt;(); String query = "select city_ID from user where name = ?"; PreparedStatement ps = con.prepareStatement(query); ps.setString(1, name); ResultSet rs = ps.executeQuery(); while (rs.next()) { cityIds.add(rs.getInt("city_ID")); } // dynamically create your query StringBuilder builder = new StringBuilder("select * from city where ID in ("); for (int i = 0; i &lt; cityIds.size(); i++) { builder.append("?"); if (i &lt; cityIds.size() - 1) { builder.append(","); } } builder.append(")"); // creating PreparedStatement ps = con.prepareStatement(builder.toString()); // adding params to query int index = 1; for (Integer id: cityIds) { ps.setInt(index, id); index++; } ResultSet rs = ps.executeQuery(); while (rs.next()) { // do your stuff } </code></pre> <p><strong>Note:</strong> I recommend you to use parametrized statements which provide much more safer dealing with database, are more human-readable and efficient.</p>
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    1. USSimon Dorociak
    1. USSimon Dorociak
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    1. COI doubt the ID of the user is the same than the ID of the city (yes I know that what OP seemed to try).
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      1. USDenys Séguret
    2. CO@dystroy im working on update.
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    3. COI changed the ID's. the first one is city_ID
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      1. USBurak Keceli
 

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