鏈変笁涓被錛欳ategory.java,Prodcuct.java,ConfigurationTest.java錛屽叾涓涓変釜綾繪槸鐢ㄦ潵嫻嬭瘯鐨勩?br /> Category.java浠ｇ爜錛?
package unsaved_value;
import ......
public class Category {
private Integer id;
private String name;
private String description;
private Set products;
public Category(){
id=null;
name=null;
description=null;
products=new HashSet ();
}
public void addProduct(Product p){
products.add(p);
}
//**********setter and getter
........
}
Product.java浠ｇ爜錛?/p>
package unsaved_value;
public class Product {
private Integer id;
private String name;
private Category category;
private String description;
public Product(){
}
//*******getter and setter
.........
}
ConfigurationTest.java
public void testSave()throws Exception{
Category category=new Category();
category.setName("java緙栫▼涔︾睄2");
category.setDescription("緙栫▼緇忓吀涔︾睄2");
Product pro=new Product();
pro.setName("java緙栫▼鎬濇兂2");
pro.setDescription("絎洓鐗堜腑鏂囩増2");
pro.setCategory(category);
category.addProduct(pro);
Transaction tx=session.beginTransaction();
assert (session!=null):("session is null");
session.save(category);
tx.commit();
}
Category浠ｈ〃浜у搧鐩綍錛岃孭roduct浠ｈ〃浜у搧錛屾樉鐒禖ategory涓嶱roduct鏄竴瀵瑰鐨勫叧緋匯侶ibernate鍦ㄦ槧灝勪竴瀵瑰鍏崇郴鏃訛紝鏈変袱縐嶆柟寮忥紝涓縐嶆槸鍗曞悜涓瀵瑰錛屼竴縐嶆槸鍙屽悜鍏崇郴銆備袱鑰呯浉姣旓紝鍙屽悜涓瀵瑰鐨勫ソ澶勪綋鐜板湪涓ゆ柟闈細(xì)棣栧厛錛屼篃鏄緢鏄庢樉鐨勪竴鐐癸紝鐢變簬鏄弻鍚戝叧鑱旓紝鎴戜滑鍦ㄥ疄闄呬笟鍔￠昏緫鏃跺皢鏇存柟渚匡紝渚嬪鎴戜滑鍙互媯(gè)绱竴涓狢ategory涓嬬殑鎵鏈塒roduct錛屽悓鏃惰繕鍙互媯(gè)绱㈠嚭Product灞炰簬鍝釜銆傚叾嬈★紝鍙屽悜鍏崇郴鐩稿鍗曞悜鍏崇郴鑰岃█錛屽湪鏁版嵁搴撶殑璁塊棶鏂歸潰鏇存湁浼樺娍銆傝繖涓鐐圭暀鍦ㄥ悗闈㈣inverse鏃惰
銆傚弻鍚戝叧鑱旀瘮鍗曞悜鍏寵仈鍞竴鐨?#8221;鍔ｅ娍“錛屽氨鍦ㄤ簬鍙屽悜鍏寵仈闇瑕佹瘮鍗曞悜鍏寵仈澶氬啓涓涓槧灝勬枃浠訛紝榪欎笉闂銆備嬌鐢ㄥ弻鍚戝叧鑱斿疄鐜拌繖涓や釜綾誨悓鏁版嵁搴撶殑鏄犲皠錛?
Category.hbm.xml:
version="1.0" encoding="UTF-8"?>
"
<hibernate-mapping package="unsaved_value">
<class name="Category" table="category">
<id name="id" column="id">
<generator class="native">generator>
id>
<property name="name" column="name"/>
<property name="description" column="description"/>
<set name="products" table="product" lazy="true" inverse="true" cascade="all">
<key column="category"/>
<one-to-many class="Product"/>
set>
class>
hibernate-mapping>
Product.hbm.xml:
version="1.0" encoding="UTF-8"?>
"
<hibernate-mapping package="unsaved_value">
<class name="Product" table="product">
<id name="id" column="id" unsaved-value="null">
<generator class="native">generator>
id>
<property name="name" column="name"/>
<property name="description" column="description"/>
<many-to-one name="category"
column="category"
class="Category"
/>
class>
hibernate-mapping>
鐜板湪鎶婅繖涓緥瀛愭墍鐗墊秹鍒扮殑鐭ヨ瘑涓涓灞曞紑錛?br />
涓.inverse
璇ヨ瘝鐨勮瘧鎰忔槸“鍙嶈漿”,鍙嶈漿浠涔堚斺斿弽杞帶鍒剁錛岃繖欏歸厤緗喅瀹氫簡鐢卞叧鑱斿弻鏂逛腑鐨勫摢涓鏂規(guī)潵緇存寔鍏寵仈鍏崇郴錛堝湪鏁版嵁搴撲腑琛ㄧ幇涓哄閿害鏉燂級(jí)銆備笂榪伴厤緗腑錛屽湪Category.hbm.xml涓皢inverse璁劇疆涓簍rue,鎰忔濇槸璇?#8220;鎴戦渶瑕佸弽杞紙鎺у埗绔級(jí)”錛屽弽杞殑緇撴灉鏄敱瀵規(guī)柟鍗砅roduct鏉ョ淮鎸佸叧鑱斿叧緋匯傜敤鍗曞悜鍏寵仈鏇村鏄撹鏄?#8221;緇存寔鍏寵仈鍏崇郴“鏄粈涔堟剰鎬濓細(xì)鑰冭檻鐢ㄥ崟鍚戝叧緋繪潵瀹炵幇榪欎釜鏄犲皠鍏崇郴鐨勬儏鍐碉紝鍗崇敱Category鍏寵仈鍒癙roduct錛岃冭檻涓嬮潰鐨勪唬鐮侊細(xì)
Product p=new Product();
..setXXX
Category c=new Category();
..璁劇疆Category鐨勫睘鎬?nbsp;
c.addProduct(p);//寤虹珛璧蜂簡c鍜宲鐨勫叧鑱斿叧緋?nbsp;
session.save(c);
浼?xì)鎵ц涓夋潯SQL璇彞:涓ゆ潯鎻掑叆璇彞錛屽垎鍒彃鍏鍜宲錛岀劧鍚庤繕鏈変竴鏉pdate璇彞寤虹珛璧穋鍜宲鐨勫叧鑱旓紙鏇存柊p鐨勫閿級(jí)銆備笂闈紝鎴戜滑璇寸敱Category绔帶鍒跺叧鑱旓紝鍥犳p.setCategory(c)榪欐牱涓鍙ヨ瘽鏄病鐢ㄧ殑,瀹冨茍涓嶄細(xì)瀵艱嚧鍦ㄦ彃鍏鐨勬椂鍊欏氨璁劇疆p鐨勫閿互寤虹珛璧蜂袱鑰呯殑鍏寵仈鍏崇郴錛屼粠鑰岃妭鐪佷竴鏉pdate璇彞銆傚悓鏃舵垜浠繕浼?xì)鐪嬪垘图屽鏋滃湪鏁版嵁搴撴ā寮忎腑灏唒鐨勫閿緗垚闈炵┖錛岃繖浜涗唬鐮佸皢涓嶈兘鎵ц錛屽洜涓哄湪鎻掑叆p鏃訛紝鐢變簬c鍜宲鐨勫叧鑱斿叧緋昏繕鏈緩绔嬭搗鏉ワ紝鍥犳p鐨勫閿負(fù)絀恒傚洖鍒板弻鍚戝叧鑱斾笂鏉ワ紝涓轟簡鏇存竻妤氬湴鏄庣櫧inverse鍦ㄥ弻鍚戝叧鑱斾腑鍒板簳璧蜂粈涔堜綔鐢紝鎴戜滑鍒嗗埆灝嗗叾鍊艱涓簍rue鍜宖alse,鐪嬬湅鎵撳嵃鍑虹殑鐨凷QL鏈変綍鍖哄埆錛?/p>
inverse=true鏃剁殑鎵撳嵃緇撴灉錛?br />
Hibernate: insert into category (name, description) values (?, ?)
Hibernate: insert into product (name, description, category) values (?, ?, ?)
inverse=false鏃剁殑鎵撳嵃緇撴灉錛?br />
Hibernate: insert into category (name, description) values (?, ?)
Hibernate: insert into product (name, description, category) values (?, ?, ?)
Hibernate: update product set category=? where id=?
涓轟粈涔坕nverse=true鏃朵細(xì)姣攊nverse=false鏃跺皯鎵ц涓鏉QL璇彞錛熻繖鏄敱鎺у埗绔殑涓嶅悓閫犳垚鐨勩傚墠鑰呰"鎴戣鍙嶈漿鎺у埗錛岀敱Product鏉ユ帶鍒跺叧鑱?錛屽洜姝ゅ湪灝唒瀵硅薄insert鏃訛紝p宸茬粡璁劇疆浜嗗叾category瀛楁錛屼粠鑰屽緩绔嬩簡鍏寵仈鍏崇郴錛岃屽悗鑰呰"鎴戜笉鍙嶈漿鎺у埗錛岀敱鎴戣嚜宸辨潵鎺у埗鍏寵仈",鍥犳鍦ㄥ皢p瀵硅薄insert鍚庯紝c涓轟簡緇存寔涓よ呯殑鍏寵仈錛岃繕瑕佸幓鎵ц涓嬈pdate錛屼互鏇存柊p鐨勫閿紝浠庤屽緩绔嬭搗涓よ呯殑鍏寵仈鍏崇郴銆?br />
緇撹錛氬浜庝竴瀵瑰鍙屽悜鍏崇郴錛屽緇堝湪“涓”閭ｄ竴鏂瑰皢鍏秈nverse璁劇疆鎴恡rue,榪欐牱浼?xì)鎻愰珮鎬ц兘銆?/p>
浜?cascade
綰ц仈銆傚綋鍏寵仈鐨?涓"鏂硅繘琛屾煇縐嶅姩浣滐紙鏇存柊錛屽垹闄わ級(jí)鏃訛紝"澶?鏂瑰嵆浣挎病鏈夋樉寮忓湴榪涜緙栫爜錛屽畠涔熶細(xì)鑷姩榪涜鍚屾牱鐨勫姩浣溿俢ascade鐨勫彲閫夊兼湁錛?br />
all : 鎵鏈夋儏鍐典笅鍧囪繘琛屽叧鑱旀搷浣溿傚嵆鏄痵ave-update + delete
none錛氭墍鏈夋儏鍐典笅鍧囦笉榪涜鍏寵仈鎿嶄綔銆傝繖鏄粯璁ゅ箋?br />
save-update:鍦ㄦ墽琛宻ave/update/saveOrUpdate鏃惰繘琛屽叧鑱旀搷浣溿?br />
delete錛氬湪鎵цdelete鏃惰繘琛屽叧鑱旀搷浣溿?br />
all-delete-orphan:A:綰ц仈save-update B綰ц仈delete C:鍒犻櫎鎵鏈夊鍎塊」錛坥rphan瀛ゅ効錛夈傚厛鐪嬬湅鐖跺瓙鍏崇郴錛屼緥濡傚湪Customer鍜孫rder鐨勬ā鍨嬩腑錛岃繖涓よ呬究鏄埗瀛愬叧緋伙紝褰撲竴涓狢ustomer鐨勭敓鍛藉懆鏈熷喅瀹歄rder鐨勭敓鍛藉懆鏈燂紝濡傛灉涓涓狢ustomer涓嶅湪浜嗭紝鍏剁浉鍏崇殑Order緇х畫瀛樺湪鏄鏃犱笟鍔℃剰涔夌殑銆傚垹闄ゆ墍鏈夊鍎塊」鐨勬剰鎬濆嵆鏄紝鍒犻櫎鎵鏈変笌鐖跺璞″け鍘誨叧鑱斿叧緋葷殑瀛愬璞°?/p>
涓?lazy
鏄惁寤惰繜鍔犺澆銆備竴鑸潵璇達(dá)紝搴旇寤惰繜鍔犺澆錛屽嵆灝唋azy璁句負(fù)true銆傚歡榪熷姞杞界殑鐩稿叧鐐瑰緢澶氾紝榪欏湪鍙﹀鐨勫涔?fàn)绗旇C腑鎬葷粨銆?/p>
鍥?unsaved-value
浠ヤ笂鏄?涓"鏂圭殑閲嶈閰嶇疆錛屽啀鐪嬬湅"澶?鏂圭殑涓涓噸瑕侀厤緗?unsaved-value,灝卞儚涓婇潰Product.hbm.xml涓殑璁劇疆閭ｆ牱錛岃繖涓欏瑰湪id鐨勯厤緗腑璁劇疆銆傝繖涓璁劇疆鏄笌綰ц仈涓璧峰伐浣滅殑銆傚叧浜庤繖涓鐐癸紝robbin璁茬殑寰堟竻妤氾細(xì)
褰撲綘鏄懼紡鐨勪嬌鐢╯ession.save()鎴栬卻ession.update()鎿嶄綔涓涓璞＄殑鏃跺欙紝瀹為檯涓婃槸鐢ㄤ笉鍒皍nsaved-value 鐨勩傛煇浜涙儏鍐典笅(鐖跺瓙琛ㄥ叧鑱斾繚瀛?錛屽綋浣犲湪紼嬪簭涓茍娌℃湁鏄懼紡鐨勪嬌鐢╯ave鎴栬卽pdate涓涓寔涔呭璞★紝閭ｄ箞Hibernate闇瑕佸垽鏂鎿嶄綔鐨勫璞＄┒绔熸槸涓涓凡緇忔寔涔呭寲榪囩殑鎸佷箙瀵硅薄錛屾槸涓涓皻鏈鎸佷箙鍖栬繃鐨勫唴瀛樹復(fù)鏃跺璞°備緥濡傦細(xì)
Session session = ...;
Transaction tx = ...;
Parent parent = (Parent) session.load(Parent.class, id);
Child child = new Child();
child.setParent(parent);
child.setName("sun");
parent.addChild(child);
s.update(parent);
s.flush();
tx.commit();
s.close();
鍦ㄤ笂渚嬩腑錛岀▼搴忓茍娌℃湁鏄懼紡鐨剆ession.save(child); 閭ｄ箞Hibernate闇瑕佺煡閬揷hild絀剁珶鏄竴涓復(fù)鏃跺璞★紝榪樻槸宸茬粡鍦ㄦ暟鎹簱涓湁鐨勬寔涔呭璞°傚鏋渃hild鏄竴涓柊鍒涘緩鐨勪復(fù)鏃跺璞?鏈緥涓氨鏄繖縐嶆儏鍐?錛岄偅涔圚ibernate搴旇鑷姩浜х敓session.save(child)榪欐牱鐨勬搷浣滐紝濡傛灉child鏄凡緇忓湪鏁版嵁搴撲腑鏈夌殑鎸佷箙瀵硅薄錛岄偅涔?Hibernate搴旇鑷姩浜х敓session.update(child)榪欐牱鐨勬搷浣溿傚洜姝ゆ垜浠渶瑕佹殫紺轟竴涓婬ibernate錛岀┒绔?child瀵硅薄搴旇瀵瑰畠鑷姩save榪樻槸update銆傚湪涓婁緥涓紝鏄劇劧鎴戜滑搴旇鏆楃ずHibernate瀵筩hild鑷姩save錛岃屼笉鏄嚜鍔?update銆傞偅涔圚ibernate濡備綍鍒ゆ柇絀剁珶瀵筩hild鏄痵ave榪樻槸update鍛紵瀹冧細(xì)鍙栦竴涓媍hild鐨勪富閿睘鎬?child.getId() 錛岃繖閲屽亣璁緄d鏄?java.lang.Integer綾誨瀷鐨勩傚鏋滃彇鍒扮殑Id鍊煎拰hbm鏄犲皠鏂囦歡涓寚瀹氱殑unsave-value鐩哥瓑錛岄偅涔圚ibernate璁や負(fù) child鏄柊鐨勫唴瀛樹復(fù)鏃跺璞★紝鍙戦乻ave錛屽鏋滀笉鐩哥瓑錛岄偅涔圚ibernate璁や負(fù)child鏄凡緇忔寔涔呰繃鐨勫璞★紝鍙戦乽pdate銆倁nsaved-value="null" (榛樿鎯呭喌錛岄傜敤浜庡ぇ澶氭暟瀵硅薄綾誨瀷涓婚敭 Integer/Long/String/...)
褰揌ibernate鍙栦竴涓媍hild鐨処d錛屽彇鍑烘潵鐨勬槸null(鍦ㄤ笂渚嬩腑鑲畾鍙栧嚭鏉ョ殑鏄痭ull)錛屽拰unsaved-value璁懼畾鍊肩浉絳夛紝鍙戦乻ave(child)
褰揌ibernate鍙栦竴涓媍hild鐨刬d錛屽彇鍑烘潵鐨勪笉鏄痭ull錛岄偅涔堝拰unsaved-value璁懼畾鍊間笉鐩哥瓑錛屽彂閫乽pdate(child)
unsaved-value鐨勫彲閫夐厤緗湁錛?br />
none錛宎ny錛宯ull
unsaved-value="none"鍜寀nsaved-value="any"涓昏鐢ㄥ湪涓婚敭灞炴т笉鏄氳繃Hibernate鐢熸垚錛岃屾槸紼嬪簭鑷繁setId()鐨勬椂鍊欍倁nsaved-value="none"鍜寀nsaved-value="any"絀剁珶鏈変粈涔堝惈涔変簡銆傚鏋滀綘闈炶鐢╝ssigned涓嶅彲錛岄偅涔堢戶緇В閲婁竴涓嬶細(xì)
unsaved-value="none" 鐨勬椂鍊欙紝鐢變簬涓嶈涓婚敭灞炴т負(fù)浠諱綍鍊鹼紝閮戒笉鍙兘涓簄one錛屽洜姝ibernate鎬繪槸瀵筩hild瀵硅薄鍙戦乽pdate(child)
unsaved-value="any" 鐨勬椂鍊欙紝鐢變簬涓嶈涓婚敭灞炴т負(fù)浠諱綍鍊鹼紝閮借偗瀹氫負(fù)any錛屽洜姝ibernate鎬繪槸瀵筩hild瀵硅薄鍙戦乻ave(child)
澶у鏁版儏鍐典笅錛屽彲浠ラ伩鍏嶄嬌鐢╝ssigned錛屽彧鏈夊綋浣犱嬌鐢ㄥ鍚堜富閿殑鏃跺欎笉寰椾笉鎵嬪伐setId()錛岃繖鏃跺欓渶瑕佷綘鑷繁鑰冭檻絀剁珶鎬庝箞璁劇疆unsaved-value浜嗭紝鏍規(guī)嵁浣犺嚜宸辯殑闇瑕佹潵瀹氥?br />
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