Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 i]%"s_l
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 RGI6W{\
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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 \ZZy`/~z*7
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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 ,8nZzVo
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分页支持类: de{YgN
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java代码: ER1mA:8>E
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package com.javaeye.common.util; s/H"Ab
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import java.util.List; dU3>h[q
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publicclass PaginationSupport { Am0C|(#Xm
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publicfinalstaticint PAGESIZE = 30; cY'To<v
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privateint pageSize = PAGESIZE; Ltd?#HP
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privateList items; l5]oS?>y
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privateint totalCount; u;qMo `-
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privateint[] indexes = newint[0]; rGGepd
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privateint startIndex = 0; qpqz. {\
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public PaginationSupport(List items, int 8'WMspX
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totalCount){ B00wcYM<1r
setPageSize(PAGESIZE); ^|i\d\
setTotalCount(totalCount); 0W%}z}/N
setItems(items); `R52{B#&/
setStartIndex(0); 7 P^{*!
} mKQST ]5
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public PaginationSupport(List items, int :_,]?n
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totalCount, int startIndex){ i)PV{3v$J
setPageSize(PAGESIZE); EZumJ."
setTotalCount(totalCount); %g@3S!lK
setItems(items); b_gN?F7_
setStartIndex(startIndex); uPC qO+f
} >VUQTg
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public PaginationSupport(List items, int GKujDx+h
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totalCount, int pageSize, int startIndex){ JBEgiQ/
setPageSize(pageSize); RR"WO
setTotalCount(totalCount); Y\Qxdq
setItems(items); ])j|<W/
setStartIndex(startIndex); bZay/ Zkj
} Hu(flc+z"
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publicList getItems(){ VFmg"^k5
return items; 2*q:
^
} 3 [)s;e
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j}
publicvoid setItems(List items){ jw(>@SXz
this.items = items; 26#Jhb E+
} ngY+Ym
&*]{"^
publicint getPageSize(){ ?}3PJVy?
return pageSize; m{$tO;c/Q
} @f5@0A\0
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publicvoid setPageSize(int pageSize){ :{i$2\DH6
this.pageSize = pageSize; eMl]td rI
} ^c0$pqZ}r
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publicint getTotalCount(){ cv*Q]F1%
return totalCount; [[0bhmG)
} Q^MXiEO+
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publicvoid setTotalCount(int totalCount){ &e]]F#
if(totalCount > 0){ Ce5w0&VlS
this.totalCount = totalCount; ]O7.ss/2
int count = totalCount / Ns!3- Y
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pageSize; V)1:LLRW
if(totalCount % pageSize > 0) yg+IkQDf4U
count++; {~p7*j^0
indexes = newint[count]; "?eH=!
for(int i = 0; i < count; i++){ cR=94i=t
indexes = pageSize * =yTa,PY
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i; FSU%?PxO
} "h;;.Y8e
}else{ ( ztim
this.totalCount = 0; Vy%
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} wsJ%*
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} #mRFUA
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publicint[] getIndexes(){ [UJEU~XC
return indexes; WE.$a t{*h
} y KYP
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publicvoid setIndexes(int[] indexes){ $\,BpZ
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this.indexes = indexes; 9o`7Kc/g
} Hw?2XDv j
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publicint getStartIndex(){ ;naq-%'Sg
return startIndex; NlF0\+h
} M<Wn]}7!
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publicvoid setStartIndex(int startIndex){ ]~prR?
if(totalCount <= 0) +=6RmId+X
this.startIndex = 0; {C/L5cZ]J
elseif(startIndex >= totalCount)
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this.startIndex = indexes ;J(rw
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[indexes.length - 1]; !]rETP_
elseif(startIndex < 0) pFsCd"zv
this.startIndex = 0; f8LrDR
else{ .|-l+
this.startIndex = indexes hg?j)jl|
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[startIndex / pageSize]; *gd?>P7\0
} :WK"-v
} _(oP{wgB
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publicint getNextIndex(){ jD '
int nextIndex = getStartIndex() + kqKj7L
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pageSize; #+K
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if(nextIndex >= totalCount) )D["M$ZA^
return getStartIndex(); af<NMgT2s~
else IpWy)B>Fl3
return nextIndex; j{{~Z M
} t['k%c
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publicint getPreviousIndex(){ 8_a$kJJ2
int previousIndex = getStartIndex() - +mfe*'AU
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pageSize; \~@[QGKN
if(previousIndex < 0) 'yPCZ`5H(
return0; .3lGX`d{
else Mw"xm9(Q
return previousIndex; V#'26@@
} e2AN[Ar
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} $J QWfGwR
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抽象业务类 4M @oj
java代码: ]d@^i)2LF
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/** kmm
* Created on 2005-7-12 _tWJXv~;
*/ I1Hw"G"&
package com.javaeye.common.business; FI]P<)*r
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import java.io.Serializable; :/C ?FHs9
import java.util.List; ;^R A!Nj
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import org.hibernate.Criteria; R K"&l!o
import org.hibernate.HibernateException; };&HhBc!g
import org.hibernate.Session; L5"8G,I
import org.hibernate.criterion.DetachedCriteria; '[Mlmgc5
import org.hibernate.criterion.Projections; Qq#Ff\|4u(
import J\het2?\
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org.springframework.orm.hibernate3.HibernateCallback; ZCy`2Fir
import 3@^MvoC
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org.springframework.orm.hibernate3.support.HibernateDaoS ]g{hhP3>
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upport; eeuZUf+~]
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import com.javaeye.common.util.PaginationSupport; _&8O~8tW
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public abstract class AbstractManager extends )^4ko
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HibernateDaoSupport { x|]\1sb"
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privateboolean cacheQueries = false; e8$l0gzaD
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privateString queryCacheRegion; yGU .AM
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publicvoid setCacheQueries(boolean Lltc4Mzw
86 *;z-G
cacheQueries){ b,nn&B5@{
this.cacheQueries = cacheQueries; OE_QInb<
} q`XW5VV{K
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publicvoid setQueryCacheRegion(String k*5'L<&
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queryCacheRegion){ h }<0 /
this.queryCacheRegion = Aj[?aL
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queryCacheRegion; z5x _fAT(
} >A-<ZS*N
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publicvoid save(finalObject entity){ AgIazv1
getHibernateTemplate().save(entity); ^NXcLEaP*<
} Rv=DI&K%n
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publicvoid persist(finalObject entity){ /QQ8.8=5
getHibernateTemplate().save(entity); |+>uA[6#
} {3VZ3i
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publicvoid update(finalObject entity){ {J (R
getHibernateTemplate().update(entity); KkEv#2n
} 1%%'6cWWu
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publicvoid delete(finalObject entity){ mw_ E&v
getHibernateTemplate().delete(entity); oizT-8i@N
} [r(Qs|
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publicObject load(finalClass entity, f\fdg].!
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finalSerializable id){ moMYdArj
return getHibernateTemplate().load L'lF/qe^
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(entity, id); zrs<#8!Y_!
} d{f@K71*
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publicObject get(finalClass entity, [QT1Ju64
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finalSerializable id){ !YiuwFt
return getHibernateTemplate().get 98fu>>*G{
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(entity, id); f/,tgA
} 4e +~.5r@i
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publicList findAll(finalClass entity){ 77V
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return getHibernateTemplate().find("from 2jl)mL
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" + entity.getName()); ,vV]"f
} .x!T+`l>8I
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publicList findByNamedQuery(finalString IS BV%^la|
} VEq:^o.
namedQuery){ RsW9:*R
return getHibernateTemplate Rs*vm
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().findByNamedQuery(namedQuery); V
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} Q.+|xwz
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publicList findByNamedQuery(finalString query, mffIf1f
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finalObject parameter){ T$KF<
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return getHibernateTemplate P}V=*g
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().findByNamedQuery(query, parameter); +E/y ~s
} Q6IQV0{p
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publicList findByNamedQuery(finalString query, JqCc;Cbd
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finalObject[] parameters){ oE?QnH3R
return getHibernateTemplate aQ#qRkI
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().findByNamedQuery(query, parameters); F2 ~%zNe
} w5KPB5/zu
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publicList find(finalString query){ .R5y:O
return getHibernateTemplate().find 99=s4*xzM
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(query); <YFY{VC(
} ]3B %8
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publicList find(finalString query, finalObject Lq (ZcEKo
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parameter){ |E@djosyC
return getHibernateTemplate().find QvLZg
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(query, parameter); FJNF%a)x2I
} 5,pSg
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public PaginationSupport findPageByCriteria C`V)VJM
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(final DetachedCriteria detachedCriteria){ 3= -pG
return findPageByCriteria C+{l7QT$t
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); tNIlzR-
} s%pfkoOY%
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public PaginationSupport findPageByCriteria N^w'Hw0
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(final DetachedCriteria detachedCriteria, finalint re &E{
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startIndex){ 7v7G[n
return findPageByCriteria xSK~s
}fR,5|~X
(detachedCriteria, PaginationSupport.PAGESIZE, nZy X_J,Vd
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startIndex); {@Y
} CHJ>{b`O
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public PaginationSupport findPageByCriteria xJs;v
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(final DetachedCriteria detachedCriteria, finalint ~8T(>!hE1h
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pageSize, BZv+H=b
finalint startIndex){ !? 5U|
return(PaginationSupport) Q@@v1G\
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getHibernateTemplate().execute(new HibernateCallback(){ BV`- =wRC
publicObject doInHibernate a4i:|
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(Session session)throws HibernateException { !ZRs;UZ>o
Criteria criteria = o>/O++7R a
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detachedCriteria.getExecutableCriteria(session); ]rN5Ao}2
int totalCount = `Y=WMNy
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((Integer) criteria.setProjection(Projections.rowCount &w8)* T
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()).uniqueResult()).intValue(); A"5z6A4WB
criteria.setProjection 9@ 16w
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(null); 5kNzv~4B,;
List items = SLfFqc+n0
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criteria.setFirstResult(startIndex).setMaxResults X|D!VX>#!
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(pageSize).list(); R%D'`*+
PaginationSupport ps = RP5+d
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new PaginationSupport(items, totalCount, pageSize, VdSv
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startIndex); P^`duZ{T
return ps; -u!FOD/
} %M|,b!eF
}, true); >>i@r@
} A5'NGt
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public List findAllByCriteria(final wa=uUM_4u^
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DetachedCriteria detachedCriteria){ 7R#+Le)
return(List) getHibernateTemplate *+'2?*
(+<1*5BEkT
().execute(new HibernateCallback(){ E37<"(;
publicObject doInHibernate @+F4YJmB?l
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(Session session)throws HibernateException { %ek'~
Criteria criteria = Eodn/
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detachedCriteria.getExecutableCriteria(session); p[lNy{u~M
return criteria.list(); $;M:TpX
} p!O(Y6QM
}, true); |2\{z{?
} +Q=1AXe
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public int getCountByCriteria(final l
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DetachedCriteria detachedCriteria){ h_1T,f(
Integer count = (Integer) 8}X5o]Mv
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getHibernateTemplate().execute(new HibernateCallback(){ g,o?q:FL
publicObject doInHibernate g.c8FP+
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(Session session)throws HibernateException { \)K^=jM
Criteria criteria = I1oje0$
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detachedCriteria.getExecutableCriteria(session); 7QKr_
return 6hZ@;Q=b
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criteria.setProjection(Projections.rowCount T,xPSN2A*
*_E|@y
()).uniqueResult(); x3qW0K8
} pj4!:{.;
}, true); -C(b,F%%
return count.intValue(); 9% l%
} #ET/ =
} 8]4U`\k4
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用户在web层构造查询条件detachedCriteria,和可选的 ]EwVpvTw
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 JpsPNa
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PaginationSupport的实例ps。 H$G0`LP0/a
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ps.getItems()得到已分页好的结果集 ebPgYxVZR
ps.getIndexes()得到分页索引的数组 s Y?,0T_m
ps.getTotalCount()得到总结果数 J!'@ Bd
ps.getStartIndex()当前分页索引 yV_4?nh
ps.getNextIndex()下一页索引 AU-n&uX
ps.getPreviousIndex()上一页索引 "qc6=:y}
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 1x,[6H
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 cZ)}LX
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一下代码重构了。 ~T) Q$
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我把原本我的做法也提供出来供大家讨论吧: /-#I_>:8'
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首先,为了实现分页查询,我封装了一个Page类: H[DUZ,J
java代码: >A@Y$.
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/*Created on 2005-4-14*/ vN3Zr34
package org.flyware.util.page; BD`2l!d
5)
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/** pp7$J2s+j
* @author Joa 5]M>8ll
* i1S>yV^l
*/ +3KEzo1=)
publicclass Page { uYE`"/h,1e
ChCrL[2
/** imply if the page has previous page */ 0ez(A
privateboolean hasPrePage; B'^:'uG
L#vI=GpL,r
/** imply if the page has next page */ &ZL3{M
privateboolean hasNextPage; tK&'<tZh
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/** the number of every page */ F <hJp,q9
privateint everyPage; kWdi595
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/** the total page number */ qhT@;W/X
privateint totalPage; 7O,U?p
61xs%kxb..
/** the number of current page */ rk)##)
privateint currentPage; Q>n|^y6
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/** the begin index of the records by the current |=&cQRY!p
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query */ cI=(\pC
privateint beginIndex; bf9a1<\
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/** The default constructor */ jg?x&'u\)
public Page(){ {J^lX/D
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} c+2FC@q{l
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/** construct the page by everyPage :]J Ye*
* @param everyPage ?(R]9.5S
* */ JGuN:c$
public Page(int everyPage){ %'[&U# -
this.everyPage = everyPage; 1 5A*7|
} _1U1(^)
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/** The whole constructor */ Uh][@35 p
public Page(boolean hasPrePage, boolean hasNextPage, 'Y]mOD^p
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int everyPage, int totalPage, W^s
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int currentPage, int beginIndex){ )n ,P"0
this.hasPrePage = hasPrePage; (&!NC[n,
this.hasNextPage = hasNextPage; 4._(|
this.everyPage = everyPage; J_FNAdQt
this.totalPage = totalPage; up'Tit
this.currentPage = currentPage; );FJx~b
this.beginIndex = beginIndex; lGVEpCS}
} 4fe7U=# ;Y
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/** 9~ l
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* @return _U/!4A
* Returns the beginIndex. EOm:!D\
*/ KCWc`Oz
publicint getBeginIndex(){ {#{DH?=^)u
return beginIndex; *V+j%^91}
} mW:!M!kk
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/** %*\es7m}
* @param beginIndex S%Us5`sd
* The beginIndex to set. )HvnoUO0
*/ s&NX@
publicvoid setBeginIndex(int beginIndex){ i F+vl]
this.beginIndex = beginIndex; f aLtdQi
} &9Xhl''
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/** ahPoEh
* @return ?.YOI.U^
* Returns the currentPage. sq;s]@~
*/ :hM/f
publicint getCurrentPage(){ G>q(iF'
return currentPage; Ud!4"<C_
} `(3/$%
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/** P><o,s"v
* @param currentPage +-G<c6 |
* The currentPage to set. wR^ RM(1
*/ qkC/\![@
publicvoid setCurrentPage(int currentPage){ VH[hsj
this.currentPage = currentPage; Qm/u h
} DoeiW=
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/** W>O~-2
* @return CjiVnWSz<
* Returns the everyPage. d$
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*/ gmm|A9+tv
publicint getEveryPage(){ >Bgw}PI
return everyPage; X@f "-\
} ]Oif|k`{
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/** tQylT0'[+o
* @param everyPage ~I}&V T
* The everyPage to set. L>YU,I\o
*/ PpgP&;z4
publicvoid setEveryPage(int everyPage){ lhkwWbB
this.everyPage = everyPage; YiPoYlD*n<
} m o:D9
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/** p1|f<SF')
* @return o9H^?Rut
* Returns the hasNextPage. nG;8:f`
*/ IEzaK
publicboolean getHasNextPage(){ AU$Uxwz4
return hasNextPage; _~T!9
} 1u6^z
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/** ka3u&3"
* @param hasNextPage ;]pJj6J&v
* The hasNextPage to set. D`VM6/iQR
*/ ph-ATJ"
publicvoid setHasNextPage(boolean hasNextPage){ ^Y
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this.hasNextPage = hasNextPage; %b"\bHH
} Mv6-|O
dS<C@(
/** $t6e2=7
* @return ^/U|2'$'>E
* Returns the hasPrePage. 8f3vjK'
*/ m`FNIY
publicboolean getHasPrePage(){ Zib)P &
return hasPrePage; />9OR
} lHhUC16>
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/**
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* @param hasPrePage n;:rf 7hGY
* The hasPrePage to set. )kkhJI*v
*/ R@`y>X GNJ
publicvoid setHasPrePage(boolean hasPrePage){ .Fa4shNV
this.hasPrePage = hasPrePage; ZAXN6h
} Y2?.}Z O
9s_,crq5
/** b%S62(qP
* @return Returns the totalPage. q2et|QCru
* fOMvj%T@2
*/ zBe8,, e
publicint getTotalPage(){ `IY/9'vT
return totalPage; !ki.t
} %C=]1Q=T)
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/** [NTtz
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* @param totalPage :P(K2q3
* The totalPage to set. &Ky_v^
*/ :"!9_p(,,
publicvoid setTotalPage(int totalPage){ r!{LLc}>
this.totalPage = totalPage; hc'-Dh
} %Pqf{*d8
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} #2EI\E&$
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