Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 e52y}'L
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 7Hm/g
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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 9"TPAywd
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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 w' gKE'c
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分页支持类: ?7:?OX
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java代码: G^ 2a<?Di
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package com.javaeye.common.util; xqAXfJ.
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import java.util.List; ~_YU%y
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publicclass PaginationSupport { w=txSF&Qr
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publicfinalstaticint PAGESIZE = 30; 1Z+\>~8
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privateint pageSize = PAGESIZE; tHj |_t
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privateList items; DwL4?!E
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privateint totalCount; 2\:z
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privateint[] indexes = newint[0]; ]("5O V5
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privateint startIndex = 0; OGjeE4
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public PaginationSupport(List items, int c_33.i"I}
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totalCount){ u,rieKYF
setPageSize(PAGESIZE); o.Jq1$)~y
setTotalCount(totalCount); [9O,C-Mk
setItems(items); xzRs;AXOp
setStartIndex(0); o5 fXe}pl@
}
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public PaginationSupport(List items, int .$k2.-k
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totalCount, int startIndex){ A>c/q&WUk
setPageSize(PAGESIZE); #n[1%8l,
setTotalCount(totalCount); qU1^ K
setItems(items); 7JedS
setStartIndex(startIndex); njk1x
} p=U/l#xO
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public PaginationSupport(List items, int cVR3_e{&H
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totalCount, int pageSize, int startIndex){ iSZiJ4AUq
setPageSize(pageSize); l/JE}Eg(
setTotalCount(totalCount); "?lm`3W"
setItems(items); l u^fKQ
setStartIndex(startIndex); 2`o}neF{
} dX58nJ4u
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publicList getItems(){ R`RLq1WA
return items; &y}nd
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} g8_C|lVZi
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publicvoid setItems(List items){ ~[mAv#d&i
this.items = items; &dino
} BE;J/
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publicint getPageSize(){ p:hzLat~
return pageSize; UI*^$7z1 +
} P`^{dH$P
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publicvoid setPageSize(int pageSize){ _`bH$
this.pageSize = pageSize; C(7Y5\"P
} ;gh#8JkI
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publicint getTotalCount(){ +!I7(gL
return totalCount; xz+Y 1fYT
} ~)zoIM \
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publicvoid setTotalCount(int totalCount){ CZ/bO#~
if(totalCount > 0){ S[b)`Wi D
this.totalCount = totalCount; 9Q#eu~R
int count = totalCount / 6!,Am^uXM
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pageSize; oH/4opV
if(totalCount % pageSize > 0) Rv)!p~V8
count++; aN.t) DG}J
indexes = newint[count]; 5K;vdwSB
for(int i = 0; i < count; i++){ L29,Y=n@
indexes = pageSize * [Z5Lgg&
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} R|%R-J]
}else{ Y=oj0(Q*
this.totalCount = 0; 93Yo}6>
} fwojFS.K
} 5!55v
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publicint[] getIndexes(){ 7-oH >OF^
return indexes; rpgr5>
} ?,JN?
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publicvoid setIndexes(int[] indexes){ :%dIX}F
this.indexes = indexes; 0x}8}
} W |]24
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publicint getStartIndex(){ ,t+5(qi
return startIndex; S^@I4Z
} mGjxc}
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publicvoid setStartIndex(int startIndex){ v5|X=B>&>
if(totalCount <= 0) y@;4F n/
this.startIndex = 0; ,KlTitJl\+
elseif(startIndex >= totalCount) |5wuYG
this.startIndex = indexes g& yR -
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[indexes.length - 1]; 9})!~r;|
elseif(startIndex < 0) 41<.e`{
this.startIndex = 0; 8t$a8 PE
else{ t5z6{`
this.startIndex = indexes 5q`d=L,
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[startIndex / pageSize]; X51 7PT8O
} :\@WY
} f:k3j}&
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publicint getNextIndex(){ g1Q^x/
int nextIndex = getStartIndex() + J?XEF@?'G
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pageSize; 1NO<K`
if(nextIndex >= totalCount) `0rEV_$
return getStartIndex(); J}7iXTh
else GNXQD}L?b?
return nextIndex; TxhTK5#f
} XelY?Ph,,
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publicint getPreviousIndex(){ U9;C#9E
int previousIndex = getStartIndex() - bA-=au?o5
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pageSize; (lhbH]I
if(previousIndex < 0) 0@rrY
return0; X6mY#T'fQ
else |X9YVZC
return previousIndex; G?)vqmJ%
} Eb`U^*A
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} v7O&9a;
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抽象业务类 LSQ2pB2V
java代码: E[J7FgU)<S
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/** ]Au78Yom
* Created on 2005-7-12 f/9]o
*/ h3issi+N
package com.javaeye.common.business; 8jxgSB",
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import java.io.Serializable; .J3lo:
import java.util.List; S @\Pki+n[
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import org.hibernate.Criteria; fmH$1C<
import org.hibernate.HibernateException; !!ZNemXct$
import org.hibernate.Session; KIdlndGs
import org.hibernate.criterion.DetachedCriteria; 6Flc4L8JU
import org.hibernate.criterion.Projections; tFvti5
import :8U=L'4
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org.springframework.orm.hibernate3.HibernateCallback; 6hSj)
import F;jl0)fBR=
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org.springframework.orm.hibernate3.support.HibernateDaoS GLA,,i'i9
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upport; OqDLb
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import com.javaeye.common.util.PaginationSupport; u >H^bCXI
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public abstract class AbstractManager extends ,,oiL
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HibernateDaoSupport { =^4 vz=2
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privateboolean cacheQueries = false; E9{Gaa/{
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privateString queryCacheRegion; : L`
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publicvoid setCacheQueries(boolean 0@1AH<
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cacheQueries){ .l5y!?
this.cacheQueries = cacheQueries; lyKV^7}
} \`r5tQ r
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publicvoid setQueryCacheRegion(String a3
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queryCacheRegion){ =LuH:VM&
this.queryCacheRegion =
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queryCacheRegion; R{kZKD=
} wQ[~7 ,o
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publicvoid save(finalObject entity){ Yd lXMddE
getHibernateTemplate().save(entity); {Q^P<
} ]*U\ gm%
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publicvoid persist(finalObject entity){ lu_ y 9o^
getHibernateTemplate().save(entity); D0=D8P}H:
} =jip* E^
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publicvoid update(finalObject entity){ e{Pgz0sOQ
getHibernateTemplate().update(entity); L.lmbxn
} R3wK@D
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publicvoid delete(finalObject entity){ 0U ?1Yh7
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getHibernateTemplate().delete(entity); }S3m
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} ^-P lTmT
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publicObject load(finalClass entity, ^~|P[}
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finalSerializable id){ +60zJ4
return getHibernateTemplate().load &fq-U5zH
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(entity, id); N%/Qc hu
} aB-*l
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publicObject get(finalClass entity, x$I~y D
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finalSerializable id){ XCoN!~
return getHibernateTemplate().get R>BI;IcX
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(entity, id); lh3%2Dq$
} ^%|{>Mz;c
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publicList findAll(finalClass entity){ f8_5.vlw
return getHibernateTemplate().find("from )7c\wAs
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" + entity.getName()); 8vz9o <I
} $
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publicList findByNamedQuery(finalString .l"_f
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namedQuery){ /A[AHJ<[?
return getHibernateTemplate ' ~ lC85
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().findByNamedQuery(namedQuery); FVT_%"%C9
} ]pl g@
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publicList findByNamedQuery(finalString query, KQaw*T[Q3w
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finalObject parameter){ c^}gJ
return getHibernateTemplate yAG4W[
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().findByNamedQuery(query, parameter); Qr1%"^4
} ny'~pT'00
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publicList findByNamedQuery(finalString query, :e ?qm7 cB
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finalObject[] parameters){ G9:[W"P
return getHibernateTemplate prb;q~
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().findByNamedQuery(query, parameters); f8+($Ys
} L{N9h1]
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publicList find(finalString query){ HviL4iO
return getHibernateTemplate().find >&RpfE[
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(query); P )_g t
} 3X89mIDr
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publicList find(finalString query, finalObject B-|:l7
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parameter){ ueDG1)
return getHibernateTemplate().find k]lM%
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(query, parameter); *5hg}[n2
} zPWG^
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public PaginationSupport findPageByCriteria C]K@SN$
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(final DetachedCriteria detachedCriteria){ UMpC2)5
return findPageByCriteria XWo:~\
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); G?&0Z++
} i*#Gq6qZq
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public PaginationSupport findPageByCriteria \,!FL))yC
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(final DetachedCriteria detachedCriteria, finalint tcSn`+Bu_`
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startIndex){ L10Vq}W"
return findPageByCriteria qi;@A-cq
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(detachedCriteria, PaginationSupport.PAGESIZE, he8y
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startIndex); $L)9'X
} ]$KyZHj{
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public PaginationSupport findPageByCriteria A?ma5h
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(final DetachedCriteria detachedCriteria, finalint =&U JFu
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pageSize, $fPf/yQmC
finalint startIndex){ vY7C!O/y_k
return(PaginationSupport) k=Pu4:RF
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getHibernateTemplate().execute(new HibernateCallback(){ zC(DigN
publicObject doInHibernate ]t\fw'
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(Session session)throws HibernateException { <@.f#
Criteria criteria = 1>c`c]s3
}at8b ^
detachedCriteria.getExecutableCriteria(session); l"*qj#FD
int totalCount = b&"=W9(V
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((Integer) criteria.setProjection(Projections.rowCount 67+ K
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gs_"H
()).uniqueResult()).intValue(); Os?G_ziIB
criteria.setProjection 2/PaXI/Z
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(null); T|GRkxd,E3
List items = [( BA:x1
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criteria.setFirstResult(startIndex).setMaxResults <8|vj2d2
br.jj
(pageSize).list(); { .B^
PaginationSupport ps = bqJL@!T
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new PaginationSupport(items, totalCount, pageSize, W(E!:
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startIndex); S7P](F=n#
return ps; ]7^OTrZ N
} %0YwaxXPn7
}, true); p~J`}>yo
} w")VcAq
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public List findAllByCriteria(final -_[n2\|we)
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DetachedCriteria detachedCriteria){ Xt(w+
return(List) getHibernateTemplate CN#`m]l.
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().execute(new HibernateCallback(){ 0t*JP
publicObject doInHibernate bLUn>ch
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(Session session)throws HibernateException { 9w[7X"#n
Criteria criteria = A7>0Pn%D3
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detachedCriteria.getExecutableCriteria(session); *>n<7T0
return criteria.list(); ~P
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} ;hA>?o_i(
}, true); yw41/jHF
} s4Lqam!
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public int getCountByCriteria(final $xNM^O
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DetachedCriteria detachedCriteria){ vg &Dr
Integer count = (Integer) v*7}ux8
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getHibernateTemplate().execute(new HibernateCallback(){ K{B[(](
publicObject doInHibernate DNcf2_m
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(Session session)throws HibernateException { sn
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Criteria criteria = +v2Fr}
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detachedCriteria.getExecutableCriteria(session); j#$ R.
return 8G`fSac`
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criteria.setProjection(Projections.rowCount !e*Q2H+
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()).uniqueResult(); t%Vc1H2}
} $`(}ygmP
}, true); "
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return count.intValue(); F<Js"z+
} &%+}bt5
} T~J6(,"
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用户在web层构造查询条件detachedCriteria,和可选的 bccJVwXv
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 -"YQo
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PaginationSupport的实例ps。 "toyfZq@
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ps.getItems()得到已分页好的结果集 /5 B{szf
ps.getIndexes()得到分页索引的数组 >p [|U`>{
ps.getTotalCount()得到总结果数 %W~Kx_
ps.getStartIndex()当前分页索引 L}UJ`U
ps.getNextIndex()下一页索引 PVH^yWi
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ps.getPreviousIndex()上一页索引 S;sggeP7,
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 _W'>?e0i
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 `% k9@k.
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一下代码重构了。 +dq&9N/
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我把原本我的做法也提供出来供大家讨论吧: ) (unL`y
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首先,为了实现分页查询,我封装了一个Page类: 6My=GByC
java代码: xy)Y)yp
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/*Created on 2005-4-14*/ PeGA+0bm
package org.flyware.util.page; 92!1I$zi
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/** bRT1~)
* @author Joa Cj"+` C)l
* [[2Zcz:
*/ n[8ju,=
publicclass Page { c,pR+DP
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/** imply if the page has previous page */ 2eo]D?}
privateboolean hasPrePage; R_ymTB}<t(
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/** imply if the page has next page */ s kC*
privateboolean hasNextPage; #Jp_y|
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/** the number of every page */ Ss6mN;&D
privateint everyPage; QxZYy}2
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/** the total page number */ (8qD'(@
privateint totalPage; piKYO+;W'
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/** the number of current page */ L;N)l2m.\
privateint currentPage; Q%)da)0:c
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/** the begin index of the records by the current Xu\FcQ{
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query */ lx_jy>$}r
privateint beginIndex; vVB8zS~l
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/** The default constructor */ lVF}G[B
public Page(){ "#1KO1@G
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} *`$Y!uzG:\
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/** construct the page by everyPage dS]TTU1
* @param everyPage ,l/~epx4v)
* */ hG51jVYtw
public Page(int everyPage){ Lc 4\i
this.everyPage = everyPage; YHBH9E/B
} j_H"m R
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/** The whole constructor */ QJiU"1
public Page(boolean hasPrePage, boolean hasNextPage, Y3@\uM`2#
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int everyPage, int totalPage, Wy1#K)LRb
int currentPage, int beginIndex){ &Ui*w%
this.hasPrePage = hasPrePage; IxN0m7
this.hasNextPage = hasNextPage; _2u RY
this.everyPage = everyPage; !bs{/?
this.totalPage = totalPage; V&nTf 100
this.currentPage = currentPage; .m%/JquMFM
this.beginIndex = beginIndex; E57:ap)/
} M~%~y`D^
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