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Connection conn = null;
try {
conn = DriverManager.getConnection(url, username, password);
conn.setAutoCommit(false);
...
conn.commit();
} catch (SQLException e) {
if (conn != null) {
conn.rollback();
}
e.printStackTrace();
} finally {
if (conn != null && !conn.isClosed()) {
conn.close();
}
}