Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 6^%68N1k
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 >rJnayLF
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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 v?&
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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 :9$F'd\
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分页支持类: 0},PJ$8x
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java代码: m0c P (
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package com.javaeye.common.util; ]y,==1To
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import java.util.List; `<\1[HJ\
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publicclass PaginationSupport { @>E2?CV
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publicfinalstaticint PAGESIZE = 30; \Dd-Xn_b
{
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privateint pageSize = PAGESIZE; 4*e0 hWp
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privateList items; N1|$$9G+
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privateint totalCount; ~[\_N\rm
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privateint[] indexes = newint[0]; u"d~!j1
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privateint startIndex = 0; *T~Ve;3h;
}MHCd)78b
public PaginationSupport(List items, int mw='dFt
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totalCount){ {|1Y:&M?
setPageSize(PAGESIZE);
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setTotalCount(totalCount); lsy?Ac
setItems(items); GQ9\'z#+
setStartIndex(0); 1$%V{4bJ
} ^sVX)%
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public PaginationSupport(List items, int ?84
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totalCount, int startIndex){ [BT/~6ovrZ
setPageSize(PAGESIZE); Qt/8r*Oe
setTotalCount(totalCount); Z| V`B `
setItems(items); 3AsT
setStartIndex(startIndex); z&{5;A}Q@
} rxy&spX
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public PaginationSupport(List items, int Q)LM-ZJKQ
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totalCount, int pageSize, int startIndex){ 2EfF=Fm>
setPageSize(pageSize); S6AU[ASY.
setTotalCount(totalCount); XwlbJ=mf
setItems(items); aEWWFN
setStartIndex(startIndex); 4( 1(e
} N9vP7
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publicList getItems(){ #:^YI
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return items; -$WYj"
} l?Fb ='#
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publicvoid setItems(List items){ &d5ia+#
this.items = items; <~n$1aA
} ;d'Z|H;
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publicint getPageSize(){ ea~:}!-P
return pageSize; OBP1B@|l$+
} <]b7ZF]
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publicvoid setPageSize(int pageSize){ k}0^&Quc4
this.pageSize = pageSize; RhvfC5Hq
} "B8"_D&
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publicint getTotalCount(){ WN_pd%m
return totalCount; TW9WMId
} 'I /aboDB
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publicvoid setTotalCount(int totalCount){ y;AL'vm9
if(totalCount > 0){ H03jDM8Q
this.totalCount = totalCount; &ZX{R#[L
int count = totalCount / |)K]U
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pageSize; L[20m(6?
if(totalCount % pageSize > 0) NbGV1q']
count++; |R#"Th6mH!
indexes = newint[count]; n Ml%'[u
for(int i = 0; i < count; i++){ mK [0L
indexes = pageSize * 0#YX=vjX7
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} y:vxE8$Q
}else{ DANw1_X\
this.totalCount = 0; )h8\u_U
} =pk)3<GwF
} <@Fy5k-%.
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publicint[] getIndexes(){ L
return indexes; ~2zMkVH
} wu4NLgkE
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publicvoid setIndexes(int[] indexes){ {M?vBgR\B
this.indexes = indexes; .^m>AKC0cX
} ryc& n5
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publicint getStartIndex(){ &09U@uc$
return startIndex; lZrVY+D
} YTjkPj:
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publicvoid setStartIndex(int startIndex){ `St.+6^J
if(totalCount <= 0) C{q :_M;
this.startIndex = 0; v,\R,{0
elseif(startIndex >= totalCount) +\{&2a?
this.startIndex = indexes 1& '8Y
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[indexes.length - 1]; cn-
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elseif(startIndex < 0) (
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this.startIndex = 0; =Mb1o[
else{ TcGoSj<Z
this.startIndex = indexes s9>(Jzcf9
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[startIndex / pageSize]; ~(@ E`s&{
}
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} X2xuwA
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publicint getNextIndex(){ Cua%1]"4w
int nextIndex = getStartIndex() + 1 `7<2w
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pageSize; ,~);EC=`
if(nextIndex >= totalCount) XJ0oS32_wK
return getStartIndex(); 2]c{P\
else j}AFE
return nextIndex; 'vbc#_;
} Dr~=o%
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publicint getPreviousIndex(){ R i'L
int previousIndex = getStartIndex() - $DP&a1'g
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pageSize; q,3;m[cA
if(previousIndex < 0) xwH?0/
return0; $7'gRb4
else /LM4-S
return previousIndex; Fbp{,V@F2
} 07/L}b`P
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} !8@*F
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抽象业务类 4W#E`9
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java代码: D)brPMS:o
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/** u<n`x6gL
* Created on 2005-7-12 Do]*JO)(
*/ fN
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package com.javaeye.common.business; =U.
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import java.io.Serializable; bhs(Qzx
import java.util.List; &|<xqt
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import org.hibernate.Criteria; G3G6IP
import org.hibernate.HibernateException; '&;69`FSe
import org.hibernate.Session; -[Qvg49jy
import org.hibernate.criterion.DetachedCriteria; R4<lln:[
import org.hibernate.criterion.Projections; z1!6%W_.
import oy<J6
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org.springframework.orm.hibernate3.HibernateCallback; !4rPv\
import RA jkH`
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org.springframework.orm.hibernate3.support.HibernateDaoS a?R[J==
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upport; T|"7sPgGR
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import com.javaeye.common.util.PaginationSupport; hGf-q?7
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public abstract class AbstractManager extends pX=,iOF[I
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HibernateDaoSupport { [ "xn5lE
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privateboolean cacheQueries = false; ]=!P(z|
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privateString queryCacheRegion; D0;tcm.$
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publicvoid setCacheQueries(boolean U4Nh
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cacheQueries){ 7);:ZpDv%L
this.cacheQueries = cacheQueries; *g;-H&`
} I|/'Ds:
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publicvoid setQueryCacheRegion(String 8#` 6M5
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queryCacheRegion){ oH2!5;A|
this.queryCacheRegion = A{<xc[w;p
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queryCacheRegion; 9B)(>~q
} @gSkROCdC)
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publicvoid save(finalObject entity){ X;!D};;M
getHibernateTemplate().save(entity); X-B8MoG|
} y5m!*=`l`
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publicvoid persist(finalObject entity){ x"(9II*
getHibernateTemplate().save(entity); CDp8)=WJFF
} ^t[HoFRa
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publicvoid update(finalObject entity){ ?G?gy2
getHibernateTemplate().update(entity); l
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} Gowp
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publicvoid delete(finalObject entity){ iS@\ =CK
getHibernateTemplate().delete(entity); |)W!jC&k
} Ak~4|w-
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publicObject load(finalClass entity, tL0`Rvl
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finalSerializable id){ @<_`2eW'/R
return getHibernateTemplate().load =z:U~D
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(entity, id); NE"jh_m-
} AH.9A_dG
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publicObject get(finalClass entity, *rqm8z50a
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finalSerializable id){ FoPginZ]J
return getHibernateTemplate().get zL s^,x
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(entity, id); ,2 WH/"
} m%QqmTH
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publicList findAll(finalClass entity){ r9ke,7?
return getHibernateTemplate().find("from R V!o4"\]
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" + entity.getName()); ,m07p~,V
} S 2$5!(P
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publicList findByNamedQuery(finalString dDKqq(9(`
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namedQuery){ n_$yV:MuT!
return getHibernateTemplate Nm8w/Q5D`
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().findByNamedQuery(namedQuery); w1B<0'#
} FsCwF&/q
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publicList findByNamedQuery(finalString query, QJ];L7Hbo
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finalObject parameter){ _g6m=N4
return getHibernateTemplate Sb^
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().findByNamedQuery(query, parameter); |#TXE|#ux
} RT"O;P
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publicList findByNamedQuery(finalString query, PW_`qP:
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finalObject[] parameters){ vmKTF!;
return getHibernateTemplate T2bnzIi
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().findByNamedQuery(query, parameters); X9'xn 0n;
} s!h5hwBY
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publicList find(finalString query){ B-Y+F
return getHibernateTemplate().find Mn"/#tXL-
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(query); 9YSVK\2$
} |vy]8?Ak
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publicList find(finalString query, finalObject hU,$|_WDy
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parameter){ jA2ofC
return getHibernateTemplate().find
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(query, parameter);
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} w67xl
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public PaginationSupport findPageByCriteria E:Y:X~vy
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(final DetachedCriteria detachedCriteria){ Y}/jR6hK
return findPageByCriteria q[boWW
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); aBCOGtf
} yQS04Bl]
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public PaginationSupport findPageByCriteria DS
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(final DetachedCriteria detachedCriteria, finalint x_ySf!ih
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startIndex){ J%4HNW*p
return findPageByCriteria 70<K.T<b
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(detachedCriteria, PaginationSupport.PAGESIZE, luF#OP C
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startIndex); G4yUC<TqBP
} 5TET<f6R
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public PaginationSupport findPageByCriteria ew"m!F#
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(final DetachedCriteria detachedCriteria, finalint 6ZHv,e`?
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pageSize, RQ5P}A
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finalint startIndex){ K|~AA"I;
return(PaginationSupport) jmPp-}tS7
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getHibernateTemplate().execute(new HibernateCallback(){ nB}e1
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publicObject doInHibernate ~mcZUiP9
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(Session session)throws HibernateException { o@@w^##
Criteria criteria = 3qcpf:
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detachedCriteria.getExecutableCriteria(session); Fs9W>*(
int totalCount = #,Bj!'Q'-
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((Integer) criteria.setProjection(Projections.rowCount MVuP
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()).uniqueResult()).intValue(); ,A?v,Fs>O[
criteria.setProjection &O{t^D)F
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(null); h~.V[o7=
List items = #[(0tc/
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criteria.setFirstResult(startIndex).setMaxResults P59uALi
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(pageSize).list(); ,|QU] E
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PaginationSupport ps = c8tP+O9
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new PaginationSupport(items, totalCount, pageSize, lzI/\%
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startIndex); 4=
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return ps; jM;d>Gymx
} ^X(_zinN"
}, true); [sptU3,2U
} :`j"Sj!t3
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public List findAllByCriteria(final `bi
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DetachedCriteria detachedCriteria){ 1[#
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return(List) getHibernateTemplate DMRs}Yz6
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().execute(new HibernateCallback(){ uyvs kz\
publicObject doInHibernate ;9Hz{ej
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(Session session)throws HibernateException { `O jvt-5}E
Criteria criteria = I@c0N*(
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detachedCriteria.getExecutableCriteria(session); `ITDTZ
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return criteria.list(); 34]%d<;A
} _]Z$YM
}, true); H|'$dO)W
} i|[S5QXCh
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public int getCountByCriteria(final /.f!
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DetachedCriteria detachedCriteria){ ]#+5)[N$>
Integer count = (Integer) ;S{ZC5
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getHibernateTemplate().execute(new HibernateCallback(){ J~:kuf21
publicObject doInHibernate 2%*|fF}I
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(Session session)throws HibernateException { -1#e^9Ve\
Criteria criteria = yW'BrTw
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detachedCriteria.getExecutableCriteria(session); $t%" Tr
return Z|f^nH#-C
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criteria.setProjection(Projections.rowCount l'P[5'.
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()).uniqueResult(); b<48#Qy~l
} ,\Z8*Jr3Q
}, true); Q&tFv;1w6
return count.intValue(); baA HP"
} mn,=V[f
} #`2GAM];7
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用户在web层构造查询条件detachedCriteria,和可选的 ye9QTK6$,
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 F&-5&'6G+
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PaginationSupport的实例ps。 b49|4
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ps.getItems()得到已分页好的结果集 %pQdq[J={
ps.getIndexes()得到分页索引的数组 V:$[~)k8
ps.getTotalCount()得到总结果数 t"4Rn<-
ps.getStartIndex()当前分页索引 8'>.#vyMGv
ps.getNextIndex()下一页索引 xy2eJJq
ps.getPreviousIndex()上一页索引 e=|F(iW
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 c1=;W$T(s
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 m^(E:6T
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一下代码重构了。 6oe$)iV
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我把原本我的做法也提供出来供大家讨论吧: m|g$'vjk
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首先,为了实现分页查询,我封装了一个Page类: $Ykp8u,(
java代码: ant-\w>}
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/*Created on 2005-4-14*/ K'ed5J
package org.flyware.util.page; u^;sx/
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/** EC:x,i
* @author Joa sP=2NqU3Q
* BUboP?#%)
*/ 70I4-[/z[d
publicclass Page { |ij W_r
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/** imply if the page has previous page */ ]ys4
privateboolean hasPrePage; RJ7/I/yD|
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/** imply if the page has next page */ 1L(Nfkh
privateboolean hasNextPage; bTI&#Hu
zYNM<W;
/** the number of every page */ ` Mv5!H5l
privateint everyPage; -+Awm{X_@
j/; @P
/** the total page number */ 5Od(J5`
privateint totalPage; '8((;N|I^
}*{\)7g
/** the number of current page */ UeC%Wa<[
privateint currentPage; P+D|_3j
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/** the begin index of the records by the current *U5>j#,
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query */ *]DJAF]
privateint beginIndex; XJV3oj
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/** The default constructor */ (urfaZ;@+
public Page(){ Vtc)/OH
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} {{#a%O
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/** construct the page by everyPage ML9T(th6v
* @param everyPage yQQDGFTb!=
* */ n=Z[w5
public Page(int everyPage){ GurE7J^=
this.everyPage = everyPage; 5i
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} cWy*K4O
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/** The whole constructor */ <o"D/<XnB3
public Page(boolean hasPrePage, boolean hasNextPage, kAKqW7,q"
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j)SgB7Q
int everyPage, int totalPage, au9Wo<mR
int currentPage, int beginIndex){ D aqy+:
this.hasPrePage = hasPrePage; f T+n-B
this.hasNextPage = hasNextPage; <8xP-(wk;
this.everyPage = everyPage; McMK|_H
this.totalPage = totalPage; _<' kzOj
this.currentPage = currentPage; Vzv.e6_
this.beginIndex = beginIndex; f%"_U'
} O7#}8-@}<u
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/** th>yi)m
* @return ;V}FbWz^v6
* Returns the beginIndex. IbNTdg]/F`
*/ ,:Ix s^-
publicint getBeginIndex(){ Cg%I)nz
return beginIndex; PtVNG
} t+TbCe
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/** :Y)kKq d
* @param beginIndex =Q8^@i4[&D
* The beginIndex to set. 5/eS1NJ@
*/ ?p/kuv{\o#
publicvoid setBeginIndex(int beginIndex){ }'M1(W
this.beginIndex = beginIndex; Vp0GmZ
} S.)8&
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/** c75vAKZ2
* @return 3YNkT"~T
* Returns the currentPage. Y.hH
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*/ U"R.!=v
publicint getCurrentPage(){ RAkFgC~
return currentPage; k:uuJ|
} TB3T:A>2
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/** <t|9`l_XW
* @param currentPage 4uE5h~0Z
* The currentPage to set. Q; /!oA_
*/ V{^fH6;[
publicvoid setCurrentPage(int currentPage){
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this.currentPage = currentPage; 5Vm}<8{
} QCY{D@7T
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/** 9+;f1nV
* @return nO7o7bc
* Returns the everyPage. (P!reYyM
*/ {&j{V-}f
publicint getEveryPage(){ igbb=@QBJ
return everyPage; p<nBS"/
} .j4ziRa-
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/** es(LE/`e
* @param everyPage Vv"wf;#
* The everyPage to set. I4p= ?Ds
*/ _e@qv;*
publicvoid setEveryPage(int everyPage){ F'_8pD7
this.everyPage = everyPage; <rI$"=7
} %T*+t"\)
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/** HG6{`i
* @return [/,6O
* Returns the hasNextPage. Rw^YTv
*/ jN[6JY1
publicboolean getHasNextPage(){ 21EUP6}8j
return hasNextPage; )BTs *7 j
} :XY3TI
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/** K#+]
* @param hasNextPage s6hWq&C
* The hasNextPage to set. cz~FWk
*/ !?M_%fNE
publicvoid setHasNextPage(boolean hasNextPage){ *R6eykp
this.hasNextPage = hasNextPage; d/zX%
} uR@Wv^
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/** Wn#JYp
* @return C>;8`6_!gU
* Returns the hasPrePage. a7d-
*/ 12DdUPOi
publicboolean getHasPrePage(){ K?m:.ZM
return hasPrePage; kb\v}gfiD/
} |.8=gS5
dw}3B8]
/** |]3);^0
* @param hasPrePage Ln%_8yth
* The hasPrePage to set. 10a*7 L
*/ @Lv_\^2/}
publicvoid setHasPrePage(boolean hasPrePage){ }$c( $
this.hasPrePage = hasPrePage; S_;:iC]B
} aJ_Eh(cF
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/** "J:NW_U
* @return Returns the totalPage. \$|UFx
* eQIi}\`
*/ SF=|++b1f
publicint getTotalPage(){ E1v<-UPbA
return totalPage; =w?cp}HW
} E4ee_`p
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/** %4^/.) Q
* @param totalPage >
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* The totalPage to set. IHmNi>E&/
*/ "?.Wb L
publicvoid setTotalPage(int totalPage){ g%P4$|C9i
this.totalPage = totalPage; @Od u.F1e
} W>IKy#
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} ({b/J0<@D
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 x G"p.
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个PageUtil,负责对Page对象进行构造: jC8BLyGE_
java代码: ^Wz{su2
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/*Created on 2005-4-14*/ Kg67cmj)f
package org.flyware.util.page; dju{&wo~4
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import org.apache.commons.logging.Log; Gukq}ZQ d
import org.apache.commons.logging.LogFactory; %LW~oI.
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/** V-u\TiL
* @author Joa 4f-C]N=
* @"2-tn@q_
*/ 99-\cQv
publicclass PageUtil { 9K(b Z{
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privatestaticfinal Log logger = LogFactory.getLog h*%1Jkxu
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(PageUtil.class); 50`r}s}
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/** j*
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* Use the origin page to create a new page svgi!=
* @param page q=(wK&
* @param totalRecords @gk[sQ\O
* @return x7>sy,c
*/ 5G[^ah<Tg
publicstatic Page createPage(Page page, int %"V,V3kw4
(U<