Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 x 3co?
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 /ykxVCvAt
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 KZ/^gR\d
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 V'h z1roe
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分页支持类: 9v3Nba
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java代码: aeLo;!Jh
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package com.javaeye.common.util; zyn =Xv@p
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import java.util.List; (eIxU&o'
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publicclass PaginationSupport { X10TZ
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publicfinalstaticint PAGESIZE = 30; MP&4}De
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privateint pageSize = PAGESIZE; ~(P\F&A(&
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privateList items; 2Sd6b 2-
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privateint totalCount; Vk=<,<BB
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privateint[] indexes = newint[0]; TK?N^ly
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privateint startIndex = 0;
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public PaginationSupport(List items, int d"uM7PMs7x
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totalCount){ wm[d5A4
setPageSize(PAGESIZE); RwHXn]1
setTotalCount(totalCount); aVL%-Il}
setItems(items); D4S?bZFHo
setStartIndex(0); Ybiz]1d
} K4L#%KUPW
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public PaginationSupport(List items, int e';c8WF3E
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totalCount, int startIndex){ pODo[Rkq
setPageSize(PAGESIZE); 62E(=l
setTotalCount(totalCount); :#KURYO<
setItems(items); iJ#oI@s
setStartIndex(startIndex); KAEpFobYo
} \:28z
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public PaginationSupport(List items, int #Ih(2T
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totalCount, int pageSize, int startIndex){ !.N=Y;@lY
setPageSize(pageSize); ;8kfgpM_
setTotalCount(totalCount); `G{t<7[[;
setItems(items); A Mfu|%ZL
setStartIndex(startIndex); jH/%Z5iu
} S8<aq P
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publicList getItems(){ 2Rt ZTn
return items; \dbtdhT;Z
} 88U
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publicvoid setItems(List items){ c67!OHu mP
this.items = items; >u[ln@ l
} ai2}vR
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publicint getPageSize(){ _~<TAFBr
return pageSize; |,f6c
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} >qZRIDE5$
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publicvoid setPageSize(int pageSize){ #r}c<?>Vw
this.pageSize = pageSize; qA[}\8}h
} p 1fnuN |,
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publicint getTotalCount(){ SjU6+|l
return totalCount; >0$5H]1u
} C*<LVW{P
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publicvoid setTotalCount(int totalCount){ ?!vW&KJZx
if(totalCount > 0){ pc>R|~J{2
this.totalCount = totalCount; 1 Qkuxw
int count = totalCount / U:(t9NX
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pageSize; #SOe&W5
if(totalCount % pageSize > 0) 93,ExgFt
count++; M?97F!\U
indexes = newint[count]; :oQaN[3>_
for(int i = 0; i < count; i++){ 3M`J.>
indexes = pageSize * Y6Q6--P
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} D':A-E
}else{ !b_IH0]U
this.totalCount = 0; C<ljBz`,t
} ]5CFL$_Q{
} `WL*Jb
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publicint[] getIndexes(){ zSO9 U
return indexes; 2Ev,dWV
} l0V@19Ec
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publicvoid setIndexes(int[] indexes){ &bNj/n/
this.indexes = indexes; AmFHn
} cQ%HwYn
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publicint getStartIndex(){ )c_ll;%
return startIndex; s,8%;\!C
} ~<3yTl>
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publicvoid setStartIndex(int startIndex){ mbK$Wp#
if(totalCount <= 0) K(Nk|gQ
this.startIndex = 0;
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elseif(startIndex >= totalCount) [; bLlS,
this.startIndex = indexes :yeTzIz]
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[indexes.length - 1]; NgQl;$
elseif(startIndex < 0) > im4'-
this.startIndex = 0; Hqk2W*UTl
else{ Z'~FZRF
this.startIndex = indexes >'eqOZM
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[startIndex / pageSize]; sQ$FtKm6
} pD9c%P
} TnrMR1Zx
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publicint getNextIndex(){ - K{ID$!p
int nextIndex = getStartIndex() + X,b}d#\
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)}
pageSize; {_JLmyaerZ
if(nextIndex >= totalCount) =
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return getStartIndex(); <f%9w]
else }\ F>z
return nextIndex; ,$Mw/fA
} E*$:~w
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publicint getPreviousIndex(){ e:]$UAzp
int previousIndex = getStartIndex() - s?G@k} {
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pageSize; gDrqs>8
if(previousIndex < 0) 4#T'Fy].
return0; ,^(T^ -
else >;Bhl|r~z
return previousIndex; {+ m)*3~w
} VmW_,
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} S70ERRk
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抽象业务类 ETIf x)B-
java代码: sr\MQ?\fB
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* Created on 2005-7-12 (?Yz#Yf
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package com.javaeye.common.business; er_aol e
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import java.io.Serializable; ,/KHKLY7
import java.util.List; {>:2Ff]O:
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import org.hibernate.Criteria; 4-\a]"c
import org.hibernate.HibernateException; Au
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import org.hibernate.Session; 0Ec -/
import org.hibernate.criterion.DetachedCriteria; Gp14;
import org.hibernate.criterion.Projections; # a3Q<%V
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org.springframework.orm.hibernate3.HibernateCallback; ,Ubnz
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org.springframework.orm.hibernate3.support.HibernateDaoS i|<*EXB"
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upport; :+YFO.7
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import com.javaeye.common.util.PaginationSupport; bx@CzXre;
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public abstract class AbstractManager extends eRf8'-"#-
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HibernateDaoSupport { Qcw/>LaL:
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privateboolean cacheQueries = false; /f#sg7)
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privateString queryCacheRegion; ScI9.{
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publicvoid setCacheQueries(boolean XdB8Oj~~
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cacheQueries){ fhC=MJ
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this.cacheQueries = cacheQueries; (<f[$ |%
} m\t
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publicvoid setQueryCacheRegion(String kqyY:J
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queryCacheRegion){ F8pLA@7[
this.queryCacheRegion = <%!@cE+y
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queryCacheRegion; qvT9d7x
} hGpaHY>My
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publicvoid save(finalObject entity){ R4o_zwWgPw
getHibernateTemplate().save(entity); L0|u^J
} ci$o~b6V
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publicvoid persist(finalObject entity){ 8\[6z0+;
getHibernateTemplate().save(entity); A5z`3T;1
} iQA
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publicvoid update(finalObject entity){ ?(mlt"tPk
getHibernateTemplate().update(entity); .rS0zU
} 9@!`,Co
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publicvoid delete(finalObject entity){ <AB]FBo(
getHibernateTemplate().delete(entity); `=FfzL
} t]Oxo`h=
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publicObject load(finalClass entity, l{;vD=D
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finalSerializable id){ fFsA[@5tul
return getHibernateTemplate().load wL}=$DN
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(entity, id); /N~.,vf
} 9XS'5AXN
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publicObject get(finalClass entity, N5g!,3
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finalSerializable id){ %POoyH@D}
return getHibernateTemplate().get Peb;XI
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(entity, id); q),yY]5
} ab6KK$s
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publicList findAll(finalClass entity){ xFgY#F
return getHibernateTemplate().find("from './s'!Lj
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" + entity.getName()); aQcJjF5x
} 1{_;`V
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publicList findByNamedQuery(finalString V,lz}&3L
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namedQuery){ /-1[}h%U'
return getHibernateTemplate q*52|?
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().findByNamedQuery(namedQuery); g&&5F>mF
} .h{`e>d
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publicList findByNamedQuery(finalString query, /JJU-A(
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finalObject parameter){
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return getHibernateTemplate { "=d7i
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().findByNamedQuery(query, parameter); u0\?aeg`
} '9*(4/,UJJ
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publicList findByNamedQuery(finalString query, F~4oPB K<
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finalObject[] parameters){ dy`K5lC@
return getHibernateTemplate 3y<;fdS7
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().findByNamedQuery(query, parameters); 6Xbo:#
} O6 bB CF;
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publicList find(finalString query){ Y2HF
return getHibernateTemplate().find }GRZCX>
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(query); 9+_SG/@
} zq _*)V
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publicList find(finalString query, finalObject r<
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parameter){ %9C_p]P*
return getHibernateTemplate().find 3%p^>D\
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(query, parameter); %dw@;IZ#8{
} @FU9!
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public PaginationSupport findPageByCriteria Pm*FA8 a7
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(final DetachedCriteria detachedCriteria){ Myvp PW
return findPageByCriteria N D`?T
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Xz4T_-X8d
} &>,c..Ke
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public PaginationSupport findPageByCriteria 86y)+h`
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(final DetachedCriteria detachedCriteria, finalint .?|pv}V
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startIndex){ 8&t3a+8l
return findPageByCriteria `o4alK\
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(detachedCriteria, PaginationSupport.PAGESIZE, qy|[V
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startIndex); LpN_s#
} W:VRLT>w>
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public PaginationSupport findPageByCriteria r~N:|ip=
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(final DetachedCriteria detachedCriteria, finalint %s&l^&ux
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pageSize, X2\1OWR0
finalint startIndex){ ,sF49CD
return(PaginationSupport) OpWTw&B"+
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getHibernateTemplate().execute(new HibernateCallback(){ $z[FL=h)?+
publicObject doInHibernate QPr29
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(Session session)throws HibernateException { u2\QhP 9
Criteria criteria = ~$w9L998+
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detachedCriteria.getExecutableCriteria(session); +xYU$e6Z
int totalCount = x6N)T4J(
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((Integer) criteria.setProjection(Projections.rowCount X3mHg5zt
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()).uniqueResult()).intValue(); MEKsL7
criteria.setProjection ,r_%p<lOFu
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(null); L/*D5k%J
List items = m!#'4
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criteria.setFirstResult(startIndex).setMaxResults I)]"`2w2w
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(pageSize).list(); 3mP251"dIW
PaginationSupport ps = k7ye,_&>
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new PaginationSupport(items, totalCount, pageSize, %7}ibz4iF
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startIndex); ;+;%s D
return ps; t nvCtuaR
} yX7P5c.
}, true); 4J5 RtK
} ngLpiU0H&
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public List findAllByCriteria(final 2-$O$&s.
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DetachedCriteria detachedCriteria){ !
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return(List) getHibernateTemplate KATu7)e&~^
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().execute(new HibernateCallback(){ &)
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publicObject doInHibernate @h=r;N#/`P
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(Session session)throws HibernateException { ;X;q8J^_K_
Criteria criteria = 0]k-0#JM
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detachedCriteria.getExecutableCriteria(session); Ht4A
return criteria.list(); 5do49H_
} ZVIlVuZ}
}, true); 'f_[(o+n
} XP%/*am
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public int getCountByCriteria(final IeN~E'~
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DetachedCriteria detachedCriteria){ *e,GXU@
Integer count = (Integer) JavSR1_
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getHibernateTemplate().execute(new HibernateCallback(){ )dh_eqnX
publicObject doInHibernate XlJA}^e
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(Session session)throws HibernateException { K#;EjR4H
Criteria criteria = |SX31T9rG
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detachedCriteria.getExecutableCriteria(session); n?mV(? N
return ?s]+2Tq
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criteria.setProjection(Projections.rowCount $+WMKv@<
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()).uniqueResult(); _z6 " C8W
} 3)*Twqt
}, true); \AY*x=PF
return count.intValue(); jI!WE$dt
} Y^ 2]*e%
}
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用户在web层构造查询条件detachedCriteria,和可选的 M32Z3<
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 WUK{st.z
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PaginationSupport的实例ps。 DAVgP7h'
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ps.getItems()得到已分页好的结果集 u.ub:
ps.getIndexes()得到分页索引的数组 N
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ps.getTotalCount()得到总结果数 s#>``E!
ps.getStartIndex()当前分页索引 wvz_)bN~A
ps.getNextIndex()下一页索引 @QbTO'UzK`
ps.getPreviousIndex()上一页索引 v%8S:3
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