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    <p>Advantages of a <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html" rel="noreferrer"><code>PreparedStatement</code></a>:</p> <ul> <li><p>Precompilation and DB-side caching of the SQL statement leads to overall faster execution and the ability to reuse the same SQL statement in <a href="https://stackoverflow.com/questions/2467125/reusing-a-preparedstatement-multiple-times">batches</a>.</p></li> <li><p>Automatic prevention of <a href="http://en.wikipedia.org/wiki/SQL_injection" rel="noreferrer">SQL injection</a> <a href="http://unixwiz.net/techtips/sql-injection.html" rel="noreferrer">attacks</a> by builtin escaping of quotes and other special characters. Note that this requires that you use any of the <code>PreparedStatement</code> <code>setXxx()</code> methods to set the values </p> <pre><code>preparedStatement = connection.prepareStatement("INSERT INTO Person (name, email, birthdate, photo) VALUES (?, ?, ?, ?)"); preparedStatement.setString(1, person.getName()); preparedStatement.setString(2, person.getEmail()); preparedStatement.setTimestamp(3, new Timestamp(person.getBirthdate().getTime())); preparedStatement.setBinaryStream(4, person.getPhoto()); preparedStatement.executeUpdate(); </code></pre> <p>and thus <strong>don't</strong> inline the values in the SQL string by string-concatenating.</p> <pre><code>preparedStatement = connection.prepareStatement("INSERT INTO Person (name, email) VALUES ('" + person.getName() + "', '" + person.getEmail() + "'"); preparedStatement.executeUpdate(); </code></pre></li> <li><p>Eases setting of non-standard Java objects in a SQL string, e.g. <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setDate%28int,%20java.sql.Date%29" rel="noreferrer"><code>Date</code></a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setTime%28int,%20java.sql.Time%29" rel="noreferrer"><code>Time</code></a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setTimestamp%28int,%20java.sql.Timestamp%29" rel="noreferrer"><code>Timestamp</code></a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setBigDecimal%28int,%20java.math.BigDecimal%29" rel="noreferrer"><code>BigDecimal</code></a>, <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setBinaryStream%28int,%20java.io.InputStream%29" rel="noreferrer"><code>InputStream</code></a> (<a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setBlob%28int,%20java.sql.Blob%29" rel="noreferrer"><code>Blob</code></a>) and <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setCharacterStream%28int,%20java.io.Reader%29" rel="noreferrer"><code>Reader</code></a> (<a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setClob%28int,%20java.sql.Clob%29" rel="noreferrer"><code>Clob</code></a>). On most of those types you can't "just" do a <code>toString()</code> as you would do in a simple <code>Statement</code>. You could even refactor it all to using <a href="http://docs.oracle.com/javase/6/docs/api/java/sql/PreparedStatement.html#setObject%28int,%20java.lang.Object%29" rel="noreferrer"><code>PreparedStatement#setObject()</code></a> inside a loop as demonstrated in the utility method below:</p> <pre><code>public static void setValues(PreparedStatement preparedStatement, Object... values) throws SQLException { for (int i = 0; i &lt; values.length; i++) { preparedStatement.setObject(i + 1, values[i]); } } </code></pre> <p>Which can be used as below:</p> <pre><code>preparedStatement = connection.prepareStatement("INSERT INTO Person (name, email, birthdate, photo) VALUES (?, ?, ?, ?)"); setValues(preparedStatement, person.getName(), person.getEmail(), new Timestamp(person.getBirthdate().getTime()), person.getPhoto()); preparedStatement.executeUpdate(); </code></pre></li> </ul>
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