PostgreSQL 7.4 Documentation
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# 31.4. Performing Updates

To change data (perform an `INSERT`, `UPDATE`, or `DELETE`) you use the `executeUpdate()` method. This method is similar to the method `executeQuery()` used to issue a `SELECT` statement, but it doesn't return a `ResultSet`; instead it returns the number of rows affected by the `INSERT`, `UPDATE`, or `DELETE` statement. Example 31-3 illustrates the usage.

Example 31-3. Deleting Rows in JDBC

This example will issue a simple `DELETE` statement and print out the number of rows deleted.

    int foovalue = 500;
    PreparedStatement st = db.prepareStatement("DELETE FROM mytable WHERE columnfoo = ?");
    st.setInt(1, foovalue);
    int rowsDeleted = st.executeUpdate();
    System.out.println(rowsDeleted + " rows deleted");
    st.close();

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