銆鍦ㄧ粷澶у鏁扮殑搴旂敤涓紝榪斿洖澶ч噺鐨勭鍚堟潯浠剁殑璁板綍鏄徃絀鴻鎯殑錛屾渶鍏稿瀷鐨勮帿榪囦簬鎼滅儲浜嗐傚湪鎼滅儲鐨勫簲鐢ㄤ腑錛岀敤鎴風(fēng)粰鍑烘悳绱㈡潯浠訛紝鏈嶅姟鍣ㄦ煡鍑虹鍚堟潯浠剁殑璁板綍銆備絾寰寰鎼滅儲浼?xì)杩斿洖澶ч噺鐨勬暟鎹褰曞Q屽鏋滃湪緗戦〉涓紝寰寰鏄氳繃鍒嗛〉鐨勬柟寮忔潵瀹炵幇錛岄〉闈㈡彁渚涜濡備笂涓欏碉紝涓嬩竴欏電瓑絳夋寜閽潵瀹炵幇鍒嗛〉銆?
鐜板湪涓昏鏈変互涓嬪嚑涓柟寮忔潵瀹炵幇鍒嗛〉錛?
1.EJB鐨凢ind鏂規(guī)硶
2.鍦ㄦ樉紺虹涓欏靛墠灝嗘墍鏈夌殑璁板綍鏀懼湪collection瀵硅薄涓紝鍚庣畫鐨勫悇欏甸兘鍦ㄥ唴瀛樹腑鍙栥?
3.姣忎竴欏甸兘鍒版暟鎹簱浣滀竴嬈￠噸澶嶇殑鏌ヨ錛岀劧鍚庡皢絎﹀悎鏉′歡鐨勮褰曟樉紺哄嚭鏉ャ?
4.淇濆瓨鍓嶅嚑欏電殑鎼滅儲緇撴灉鍦ㄥ唴瀛樹腑錛堢粡甯鎬嬌鐢ㄥ埌鐨勶級錛屽悗緇殑璁板綍錛堣繖浜涙暟鎹槸澶氭暟鐢ㄦ埛閮芥病鏈夎愬績鐪嬬殑錛夊啀閫氳繃榪炴暟鎹簱鍙栧緱銆?
5.鍏朵粬鍚勭cache鏈哄埗銆?
鎴戜滑鍙互鏍規(guī)嵁瀹為檯鎯呭喌鏉ラ夋嫨閫傚悎鑷繁鐨勬柟娉曪紝鎴戠粰澶у浠嬬粛涓涓氳繃鏍囧噯鐨凷QL璇彞鏉ュ緱鍒扮鍚堟潯浠剁殑鏁版嵁銆傚浠庣10鍒?0鏉＄殑絎﹀悎鏉′歡錛坵here璇彞涓殑錛夌殑璁板綍銆傞氳繃榪欑鏂規(guī)硶鍙栧緱璁板綍鏈変竴涓繀瑕佹潯浠訛紝蹇呴』鏈変竴涓兘澶熸爣璇嗚褰曢『搴忕殑瀛楁錛屽id錛宼ime絳夌瓑銆備笅闈㈡垜涓哄ぇ瀹舵紨紺轟竴涓緥瀛愶細(xì)
鏌ヨt_table琛ㄤ腑鎵鏈夎褰曠10鍒?0鏉★紝鎸塱d鎺掑簭銆?
SQL璇彞涓猴細(xì)
SELECT * FROM t_table t1 WHERE (SELECT count(*) FROM t_table t2 WHERE t2.id < t1.id ) > = 10 AND (SELECT count(*) FROM t_table t2 WHERE t2.id < t1.id ) < 20
鍙堝鏌ヨt_table琛ㄤ腑key='123'絎?0鍒?0鏉＄殑璁板綍錛屾寜id鎺掑簭銆?
SELECT * FROM t_table t1 WHERE (SELECT count(*) FROM t_table t2 WHERE t2.id < t1.id AND t2.key = '123') > = 10 AND (SELECT count(*) FROM t_table t2 WHERE t2.id < t1.id AND t2.key = '123') < 20 AND t1.key = '123'
褰撶劧鏉′歡涓殑id鍙互鎹負(fù)浠諱綍鑳借〃璇嗚褰曢『搴忕殑瀛楁銆?/span>
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