馃殌 涓€銆佷綘鐨凥ibernate搴旂敤鏄笉鏄秺鐢ㄨ秺鍗★紵璇曡瘯杩欎釜锛?/h3>

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鈥?strong>鈥嬬牬灞€鏂规硶鈥?/strong>鈥嬶紙琛ㄦ牸瀵规瘮锛夛細

鏌ヨ鏂瑰紡	SQL鏁伴噺	鑰楁椂锛?涓囨暟鎹級
榛樿鎳掑姞杞?/td>	10001	8.7绉?/td>
JOIN FETCH浼樺寲	1	0.3绉?/td>

鈥?strong>鈥嬪叧閿唬鐮佲€?/strong>鈥嬶細

java澶嶅埗
// 閿欒鍐欐硶锛堜骇鐢烴+1锛?/span>
List orders = session.createQuery("from Order").list();

// 姝ｇ‘濮垮娍馃敟
String hql = "select o from Order o join fetch o.user";
Query query = session.createQuery(hql);

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馃挕 浜屻€佺紦瀛樼敤寰楀ソ锛屾€ц兘鎻愬崌娌＄儲鎭?/h3>

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杩欓噷鏈変釜闅愯棌鐭ヨ瘑鐐癸細Hibernate鐨勨€?strong>鈥嬩簩绾х紦瀛樷€?/strong>鈥嬪拰鈥?strong>鈥嬫煡璇㈢紦瀛樷€?/strong>鈥嬭閰嶅悎浣跨敤鎵嶇粰鍔涳紒寰堝灏忎紮浼村彧寮€浜嗕簩绾х紦瀛橈紝缁撴灉鏌ヨ杩樻槸鎱㈠悶鍚炪€?/p>

鈥?strong>鈥嬪疄鎴樻楠も€?/strong>鈥嬶細

1. 閰嶇疆Ehcache锛堝湪pom.xml鍔犱緷璧栵級
2. 鍦ㄥ疄浣撶被涓婂姞@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
3. 鏌ヨ鏃跺紑鍚紦瀛橈細query.setCacheable(true);

鈥?strong>鈥嬮伩鍧戞寚鍗椻€?/strong>鈥嬶細

• 缂撳瓨閫傚悎鈥?strong>鈥嬭澶氬啓灏戔€?/strong>鈥嬬殑鍦烘櫙锛堟瘮濡傚晢鍝佸垎绫绘暟鎹級
• 閬囧埌缂撳瓨闆穿锛熻瘯璇曠粰缂撳瓨璁剧疆涓嶅悓鐨勮繃鏈熸椂闂?/li>

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馃攳 涓夈€佹壒閲忔搷浣滅殑姝ｇ‘鎵撳紑鏂瑰紡

鈥?strong>鈥嬭娉暀璁€?/strong>鈥嬶細鏇剧粡鏈変釜绋嬪簭鍛樼敤for寰幆鎻掑叆10涓囨潯鏁版嵁锛岀粨鏋滄湇鍔″櫒宕╀簡...
Hibernate鐨勬壒閲忓鐞嗘湁闂ㄩ亾锛佽浣忚繖涓変釜鍙傛暟锛?/p>

1. hibernate.jdbc.batch_size=50
2. hibernate.order_inserts=true
3. hibernate.order_updates=true

鈥?strong>鈥嬫€ц兘瀵规瘮瀹為獙鈥?/strong>鈥嬶細

鈥?strong>鈥嬫纭唬鐮佹ā鏉库€?/strong>鈥嬶細

java澶嶅埗
Session session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();

for (int i=0; i<100000; i++) {
    User user = new User("user_"+i);
    session.save(user);
    
    // 姣?0鏉″埛涓€娆＄紦瀛?/span>
    if(i % 50 == 0) {
        session.flush();
        session.clear();
    }
}
tx.commit();

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鏈€鍚庤涓ぇ瀹炶瘽锛氭€ц兘浼樺寲涓嶆槸鐐妧锛屽叧閿鎵惧噯涓氬姟鍦烘櫙銆傚氨鍍忓仛鑿滐紝澶х伀蹇倰鍜屽皬鐏參鐐栧緱鐪嬮鏉愩€備笅娆￠亣鍒版€ц兘闂锛屽厛鎷库€?strong>鈥媓ibernate.show_sql=true鈥?/strong>鈥嬬湅鐪嬬敓鎴愮殑SQL锛屼繚鍑嗚兘鍙戠幇鎯婂枩锛堟垨鑰呮儕鍚擄級锛?/p>