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                # 10.4.1.1\. 迭代式獲取結果(Iterating results) 某些情況下,你可以使用`iterate()`方法得到更好的性能。 這通常是你預期返回的結果在session,或二級緩存(second-level cache)中已經存在時的情況。 如若不然,`iterate()`會比`list()`慢,而且可能簡單查詢也需要進行多次數據庫訪問: `iterate()`會首先使用_1_條語句得到所有對象的持久化標識(identifiers),再根據持久化標識執行_n_條附加的select語句實例化實際的對象。 ``` // fetch ids Iterator iter = sess.createQuery("from eg.Qux q order by q.likeliness").iterate(); while ( iter.hasNext() ) { Qux qux = (Qux) iter.next(); // fetch the object // something we couldnt express in the query if ( qux.calculateComplicatedAlgorithm() ) { // delete the current instance iter.remove(); // dont need to process the rest break; } } ```
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