锘??xml version="1.0" encoding="utf-8" standalone="yes"?>亚洲嫩模在线观看,久久亚洲一区二区,亚洲av日韩av综合http://www.tkk7.com/forgood/archive/2009/01/11/250870.html#250871forgoodforgoodSun, 11 Jan 2009 09:52:00 GMThttp://www.tkk7.com/forgood/archive/2009/01/11/250870.html#250871 JAVA鍙嶅皠鏈哄埗鏄湪榪愯鐘舵佷腑錛屽浜庝換鎰忎竴涓被錛岄兘鑳藉鐭ラ亾榪欎釜綾葷殑鎵鏈夊睘鎬у拰鏂規硶錛涘浜庝換鎰忎竴涓璞★紝閮借兘澶熻皟鐢ㄥ畠鐨勪換鎰忎竴涓柟娉曪紱榪欑鍔ㄦ佽幏鍙栫殑淇℃伅浠ュ強鍔ㄦ佽皟鐢ㄥ璞$殑鏂規硶鐨勫姛鑳界О涓簀ava璇█鐨勫弽灝勬満鍒躲?
Java鍙嶅皠鏈哄埗涓昏鎻愪緵浜嗕互涓嬪姛鑳斤細 鍦ㄨ繍琛屾椂鍒ゆ柇浠繪剰涓涓璞℃墍灞炵殑綾伙紱鍦ㄨ繍琛屾椂鏋勯犱換鎰忎竴涓被鐨勫璞★紱鍦ㄨ繍琛屾椂鍒ゆ柇浠繪剰涓涓被鎵鍏鋒湁鐨勬垚鍛樺彉閲忓拰鏂規硶錛涘湪榪愯鏃惰皟鐢ㄤ換鎰忎竴涓璞$殑鏂規硶錛涚敓鎴愬姩鎬佷唬鐞嗐?
1. 寰楀埌鏌愪釜瀵硅薄鐨勫睘鎬?
1 public Object getProperty(Object owner, String fieldName) throws Exception {
2 Class ownerClass = owner.getClass();
3
4 Field field = ownerClass.getField(fieldName);
5
6 Object property = field.get(owner);
7
8 return property;
9 }
Class ownerClass = owner.getClass()錛氬緱鍒拌瀵硅薄鐨凜lass銆?
Field field = ownerClass.getField(fieldName)錛氶氳繃Class寰楀埌綾誨0鏄庣殑灞炴с?
Object property = field.get(owner)錛氶氳繃瀵硅薄寰楀埌璇ュ睘鎬х殑瀹炰緥錛屽鏋滆繖涓睘鎬ф槸闈炲叕鏈夌殑錛岃繖閲屼細鎶llegalAccessException銆?
2. 寰楀埌鏌愪釜綾葷殑闈欐佸睘鎬?
1 public Object getStaticProperty(String className, String fieldName)
2 throws Exception {
3 Class ownerClass = Class.forName(className);
4
5 Field field = ownerClass.getField(fieldName);
6
7 Object property = field.get(ownerClass);
8
9 return property;
10 }
Class ownerClass = Class.forName(className) 錛氶鍏堝緱鍒拌繖涓被鐨凜lass銆?
Field field = ownerClass.getField(fieldName)錛氬拰涓婇潰涓鏍鳳紝閫氳繃Class寰楀埌綾誨0鏄庣殑灞炴с?
Object property = field.get(ownerClass) 錛氳繖閲屽拰涓婇潰鏈変簺涓嶅悓錛屽洜涓鴻灞炴ф槸闈欐佺殑錛屾墍浠ョ洿鎺ヤ粠綾葷殑Class閲屽彇銆?
3. 鎵ц鏌愬璞$殑鏂規硶
1 public Object invokeMethod(Object owner, String methodName, Object[] args) throws Exception {
2
3 Class ownerClass = owner.getClass();
4
5 Class[] argsClass = new Class[args.length];
6
7 for (int i = 0, j = args.length; i < j; i++) {
8 argsClass[i] = args[i].getClass();
9 }
10
11 Method method = ownerClass.getMethod(methodName, argsClass);
12
13 return method.invoke(owner, args);
14 }
Class owner_class = owner.getClass() 錛氶鍏堣繕鏄繀欏誨緱鍒拌繖涓璞$殑Class銆?
5锝?琛岋細閰嶇疆鍙傛暟鐨凜lass鏁扮粍錛屼綔涓哄鎵綧ethod鐨勬潯浠躲?
Method method = ownerClass.getMethod(methodName, argsClass)錛氶氳繃Method鍚嶅拰鍙傛暟鐨凜lass鏁扮粍寰楀埌瑕佹墽琛岀殑Method銆?
method.invoke(owner, args)錛氭墽琛岃Method錛宨nvoke鏂規硶鐨勫弬鏁版槸鎵ц榪欎釜鏂規硶鐨勫璞★紝鍜屽弬鏁版暟緇勩傝繑鍥炲兼槸Object錛屼篃鏃㈡槸璇ユ柟娉曠殑榪斿洖鍊箋?
4. 鎵ц鏌愪釜綾葷殑闈欐佹柟娉?
1 public Object invokeStaticMethod(String className, String methodName,
2 Object[] args) throws Exception {
3 Class ownerClass = Class.forName(className);
4
5 Class[] argsClass = new Class[args.length];
6
7 for (int i = 0, j = args.length; i < j; i++) {
8 argsClass[i] = args[i].getClass();
9 }
10
11 Method method = ownerClass.getMethod(methodName, argsClass);
12
13 return method.invoke(null, args);
14 }
鍩烘湰鐨勫師鐞嗗拰瀹炰緥3鐩稿悓錛屼笉鍚岀偣鏄渶鍚庝竴琛岋紝invoke鐨勪竴涓弬鏁版槸null錛屽洜涓鴻繖鏄潤鎬佹柟娉曪紝涓嶉渶瑕佸熷姪瀹炰緥榪愯銆?
5. 鏂板緩瀹炰緥
1
2 public Object newInstance(String className, Object[] args) throws Exception {
3 Class newoneClass = Class.forName(className);
4
5 Class[] argsClass = new Class[args.length];
6
7 for (int i = 0, j = args.length; i < j; i++) {
8 argsClass[i] = args[i].getClass();
9 }
10
11 Constructor cons = newoneClass.getConstructor(argsClass);
12
13 return cons.newInstance(args);
14
15 }
榪欓噷璇寸殑鏂規硶鏄墽琛屽甫鍙傛暟鐨勬瀯閫犲嚱鏁版潵鏂板緩瀹炰緥鐨勬柟娉曘傚鏋滀笉闇瑕佸弬鏁幫紝鍙互鐩存帴浣跨敤newoneClass.newInstance()鏉ュ疄鐜般?
Class newoneClass = Class.forName(className)錛氱涓姝ワ紝寰楀埌瑕佹瀯閫犵殑瀹炰緥鐨凜lass銆?
絎?锝炵9琛岋細寰楀埌鍙傛暟鐨凜lass鏁扮粍銆?
Constructor cons = newoneClass.getConstructor(argsClass)錛氬緱鍒版瀯閫犲瓙銆?
cons.newInstance(args)錛氭柊寤哄疄渚嬨?
6. 鍒ゆ柇鏄惁涓烘煇涓被鐨勫疄渚?
1 public boolean isInstance(Object obj, Class cls) {
2 return cls.isInstance(obj);
3 }
7. 寰楀埌鏁扮粍涓殑鏌愪釜鍏冪礌
1 public Object getByArray(Object array, int index) {
2 return Array.get(array,index);
3 }

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insert into destTbl(fld1, fld2) select fld1, 5 from srcTbl
浠ヤ笂涓ゅ彞閮芥槸灝?srcTbl 鐨勬暟鎹彃鍏ュ埌 destTbl錛屼絾涓ゅ彞鍙堟湁鍖哄埆鐨勩?
絎竴鍙ワ紙select into from錛夎姹傜洰鏍囪〃錛坉estTbl錛変笉瀛樺湪錛屽洜涓哄湪鎻掑叆鏃朵細鑷姩鍒涘緩銆?
絎簩鍙ワ紙insert into select from錛夎姹傜洰鏍囪〃錛坉estTbl錛夊瓨鍦紝鐢變簬鐩爣琛ㄥ凡緇忓瓨鍦紝鎵浠ユ垜浠櫎浜嗘彃鍏ユ簮琛紙srcTbl錛夌殑瀛楁澶栵紝榪樺彲浠ユ彃鍏ュ父閲?

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