Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ,#0#1k<Dm
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 j!0-3YKv
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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 mr]~(]B?r
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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 q!h'rX=_-
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分页支持类: Aaz:C5dtU
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java代码: c%
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package com.javaeye.common.util; =4!m]*y
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import java.util.List; M3JV^{O/DV
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publicclass PaginationSupport { e%9zY{ABR%
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publicfinalstaticint PAGESIZE = 30; .+lx}#-#
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privateint pageSize = PAGESIZE; aHitPPlq
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privateList items; i"4;{C{s
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privateint totalCount; ,,S 2>X*L
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privateint[] indexes = newint[0]; H>-{.E1bG
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privateint startIndex = 0; <Y;w
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public PaginationSupport(List items, int ,kFp%qNj
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totalCount){ 4:s,e<Tc4v
setPageSize(PAGESIZE); ?+{_x^
setTotalCount(totalCount); br?pfs$U
setItems(items); f&Juq8s_0
setStartIndex(0); lXVh`+X/l
} M%$-c3x
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public PaginationSupport(List items, int PT4iy<
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totalCount, int startIndex){ _0iV6Bj
setPageSize(PAGESIZE); <e@4;Z(h04
setTotalCount(totalCount); lpbcpB
setItems(items); p@@*F+
setStartIndex(startIndex); \34:]NM
} (7??5gjh
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public PaginationSupport(List items, int |#(y?! A^
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totalCount, int pageSize, int startIndex){ 7eFFKl
setPageSize(pageSize); ^=gN >xP
setTotalCount(totalCount); _+Pz~_+kS
setItems(items); Juk'eH2^s
setStartIndex(startIndex); dTwYDV}:
} fK^;?4
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publicList getItems(){ ~svea>Fmr
return items; ?ihRt+eR~
} fUq
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publicvoid setItems(List items){ .W\x{h
this.items = items; @F|pKf:M+
} >YcaFnY
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publicint getPageSize(){ VLbbn
return pageSize; (L W2S;-
} 4S* X=1
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publicvoid setPageSize(int pageSize){ @"aqnj>+
this.pageSize = pageSize; ( De>k8
} PJ<9T3Fa
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publicint getTotalCount(){ *}>)E]O@
return totalCount; |Rm_8n%m
} jK{qw
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publicvoid setTotalCount(int totalCount){ Q-yNw0V}F
if(totalCount > 0){ {m_y<
this.totalCount = totalCount; :8A@4vMS)?
int count = totalCount / {WTy/$ Qk
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pageSize; zu,Yuq
if(totalCount % pageSize > 0) l4&
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count++; .OlPVMFt
indexes = newint[count]; 1%";|
for(int i = 0; i < count; i++){ }LoMS<O-[
indexes = pageSize * 34J*<B[Njo
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} Z4sS;k]}
}else{ MIqH%W.ru
this.totalCount = 0; okO\A^F
} BxaGBK<k
} 4K|O?MUNS
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publicint[] getIndexes(){ $3cZS
return indexes; 8zh o\'
} VU+=b+B~m
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publicvoid setIndexes(int[] indexes){ mH)8A+us
this.indexes = indexes; :OA;vp~$x
} G(bl)p^
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publicint getStartIndex(){ xZVZYvC,t
return startIndex; $dsLU5]1o
} Fx:4d$>;
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publicvoid setStartIndex(int startIndex){ f @Vd'k<
if(totalCount <= 0) 2dDhO
this.startIndex = 0; WwxV}?Cf+
elseif(startIndex >= totalCount) @c).&7
this.startIndex = indexes UQbk%K2
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[indexes.length - 1]; lWUQkS
elseif(startIndex < 0) |*l^<= =
this.startIndex = 0; ~m[Gp;pL
else{ XR$i:kL,,
this.startIndex = indexes =o'g5Be<F
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[startIndex / pageSize]; *aGJ$ P0
} C(M ?$s`
} 1E0!?kRK
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publicint getNextIndex(){ 7W>(T8K X\
int nextIndex = getStartIndex() + Qm_;o(
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pageSize; g@Rs.Zq
if(nextIndex >= totalCount) 7JBr{3;eS
return getStartIndex(); v<mSd2B*
else z|zEsDh;
return nextIndex; Q(4~r+
} %\~U>3Q
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publicint getPreviousIndex(){ _v++NyZXx
int previousIndex = getStartIndex() - L XTtV0F
$lAdh
pageSize; #+$PD`j
if(previousIndex < 0) 46~nwi$,^
return0; Tt,T6zs-<
else ScmwHid:\
return previousIndex; FRXaPod
} ??("0U
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} J7t) H_S{
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抽象业务类 Vt:\llsin
java代码: *w}r:04F
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/** >~tx8aI{
* Created on 2005-7-12 n'%cO]nSx
*/ dV-6 l6
package com.javaeye.common.business; F)@zo/u5L
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import java.io.Serializable; 4
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import java.util.List; kYR^
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import org.hibernate.Criteria; pimI)1 !$'
import org.hibernate.HibernateException; MPF({Pnx7
import org.hibernate.Session; x6^FpNgQ
import org.hibernate.criterion.DetachedCriteria; 9#kk5 )J
import org.hibernate.criterion.Projections; O'QnfpQ*9
import 12: Q`
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org.springframework.orm.hibernate3.HibernateCallback; y.(m#&T
import *:`fgaIDa
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org.springframework.orm.hibernate3.support.HibernateDaoS -OnKvpeI
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upport; d@zxgn7o
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import com.javaeye.common.util.PaginationSupport; 8?|W-rN
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public abstract class AbstractManager extends LLoV]~dvUu
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HibernateDaoSupport { 7uOtdH+
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privateboolean cacheQueries = false; 77j"zr7v
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privateString queryCacheRegion; _,I~1"
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publicvoid setCacheQueries(boolean &v Q5+
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cacheQueries){ g4;|uK;
this.cacheQueries = cacheQueries; f lt'~fe
} uLNOhgSUf
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publicvoid setQueryCacheRegion(String >t.PU.OM
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queryCacheRegion){
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this.queryCacheRegion = "hZ `^"0b
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queryCacheRegion; $_e{Zv[
} rA@|nL{
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publicvoid save(finalObject entity){ q6x}\$mL
getHibernateTemplate().save(entity); :`0,f ?cE
} @]42.oP
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publicvoid persist(finalObject entity){ )QmmI[,tq
getHibernateTemplate().save(entity); K9K.mGYc
} XXQC`%-]<i
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publicvoid update(finalObject entity){ u;b 6uE
getHibernateTemplate().update(entity); #G\-ftA &
} ?DnQU"_$
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publicvoid delete(finalObject entity){ >4HB~9dKU
getHibernateTemplate().delete(entity); cBHUa}:
} ^E%NYq_2l<
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publicObject load(finalClass entity, H)y_[:[
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finalSerializable id){ %O{FZgi%wA
return getHibernateTemplate().load uVXn/B
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(entity, id); u/N_62sk5
} W&m3"~BJ
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publicObject get(finalClass entity, {3!A\OR
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finalSerializable id){ w[G-=>;
return getHibernateTemplate().get ZT,auSX
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(entity, id); #;m^DX QZn
} $lJ!f
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publicList findAll(finalClass entity){ YYvX@f
return getHibernateTemplate().find("from CM`Q((
+.$:ZzH#
" + entity.getName()); 2Ns<lh
} $0]5b{i]
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publicList findByNamedQuery(finalString Eh"Y<]$
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namedQuery){ e`5:46k|
return getHibernateTemplate =Hj3o_g-
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().findByNamedQuery(namedQuery); -7 EwZRS@9
} 64:p 4N
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publicList findByNamedQuery(finalString query, z3w;W{2Q;V
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finalObject parameter){ !=+;9Ry$z
return getHibernateTemplate Q0xQxz
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().findByNamedQuery(query, parameter); c{T)31ldW
} F-$NoEL
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publicList findByNamedQuery(finalString query, !'>#!S~h3
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finalObject[] parameters){ d 5hx%M
return getHibernateTemplate ~{6}SXp4U
)F0Q2P1I
().findByNamedQuery(query, parameters); B\`${O(
}
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publicList find(finalString query){ O[=W%2I!i
return getHibernateTemplate().find F<)f&<5E-
@Z96902<t
(query); 6-nf+!#G
} frWY8&W^H
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publicList find(finalString query, finalObject uLN.b339
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parameter){ 4U[X-AIY&
return getHibernateTemplate().find nH[>Sff$
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(query, parameter); Z,F1n/7
} r&XxF>
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public PaginationSupport findPageByCriteria *mN8Qd
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(final DetachedCriteria detachedCriteria){ TQ5kT?/{
return findPageByCriteria 5%DHF-W)
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); wJ7Fnj>u%
} ASNo6dP7
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public PaginationSupport findPageByCriteria <*p
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(final DetachedCriteria detachedCriteria, finalint FWS!b!#,N
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startIndex){ RLDu5
return findPageByCriteria t1aKq)?
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(detachedCriteria, PaginationSupport.PAGESIZE, HA0yX?f]
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startIndex); hllb\Y)XL
} D,s[{RW+q
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public PaginationSupport findPageByCriteria "VAbUs
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(final DetachedCriteria detachedCriteria, finalint 6V1
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pageSize, 1oG'm
finalint startIndex){ *(VwD)*
return(PaginationSupport) oMN
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e#?rK=C?9
getHibernateTemplate().execute(new HibernateCallback(){ 'EkjySZ]F{
publicObject doInHibernate X|60W
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(Session session)throws HibernateException { \(1WLP$2U
Criteria criteria = "04:1J`
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detachedCriteria.getExecutableCriteria(session); 5eas^Rm
int totalCount = J
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*0 ;|
((Integer) criteria.setProjection(Projections.rowCount @h7
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j,N,WtE
()).uniqueResult()).intValue(); 4Y@q.QP
criteria.setProjection r / L
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(null); zc>LwX}<
List items = m] @o1J
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criteria.setFirstResult(startIndex).setMaxResults Q!W+vh
=5h,ZB2A
(pageSize).list(); M,P:<-J
PaginationSupport ps = hQDl&A
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new PaginationSupport(items, totalCount, pageSize, f<@`{oP@
$`/F5R!
startIndex); mmEe@-lE
return ps; ~G~:R
} 0"`|f0}c
}, true); <9?`zo$y
} ;3sJ7%`v
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public List findAllByCriteria(final Oxh.&
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DetachedCriteria detachedCriteria){ 6x!
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return(List) getHibernateTemplate q.p.y0
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().execute(new HibernateCallback(){ t$*CyYb{@
publicObject doInHibernate y1Yrf,E
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(Session session)throws HibernateException { ==~
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Criteria criteria = K_BF=C.k
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detachedCriteria.getExecutableCriteria(session); qg8T}y>
return criteria.list(); {+|Em (M
} h)yAge
}, true); j}$Q`7-wB1
} &0euNHH;sL
BoPJ;6?>}
public int getCountByCriteria(final B,ZLX/c9
n)>nfnh
DetachedCriteria detachedCriteria){ +~M`rR*
Integer count = (Integer) $:0?"?o);
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getHibernateTemplate().execute(new HibernateCallback(){ @jH8x!5u:
publicObject doInHibernate .cg"M0
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(Session session)throws HibernateException { Z_?r5M;
Criteria criteria = LgoUD*MbQ
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detachedCriteria.getExecutableCriteria(session); OW8"7*irT
return ?rv5Z^D'
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criteria.setProjection(Projections.rowCount GAcU8MD
{@`Z`h"N
()).uniqueResult(); +8q]O%B
} 5TcirVO82
}, true); +J%9%DqF
return count.intValue(); Klk[h
} Fu#mMn0c
} $ ~2qEe.h
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用户在web层构造查询条件detachedCriteria,和可选的 % wS5m#n
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 @K.[;-;g
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PaginationSupport的实例ps。 lzStJ,NPqn
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ps.getItems()得到已分页好的结果集 1t7S:IZ
ps.getIndexes()得到分页索引的数组 ?3:xR_VWZu
ps.getTotalCount()得到总结果数 Z,m;eCLG]
ps.getStartIndex()当前分页索引 M `bEnu
ps.getNextIndex()下一页索引 .jC-&(R
+
ps.getPreviousIndex()上一页索引 ^ G(GjW8
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 `?R~iLIAq
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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 ;.P9t`*
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一下代码重构了。 +gQoYlso
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我把原本我的做法也提供出来供大家讨论吧: +c^[[ K"
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首先,为了实现分页查询,我封装了一个Page类: bC@9
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java代码: ' |>
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/*Created on 2005-4-14*/ ^}4=pkJ;s
package org.flyware.util.page; bl;C=n
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/** e$+?l~
* @author Joa O0i[GCtP5
* gLef6q{}
*/ { f@k2^
publicclass Page { s'/ g:aJ
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/** imply if the page has previous page */ OJ:iQ
privateboolean hasPrePage; P9aGDma
"##Ylq( "
/** imply if the page has next page */ sA u ;i
privateboolean hasNextPage; Ph*tZrd*#
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/** the number of every page */ YI*Av+Z)
privateint everyPage; h)qapC5z,
sKT GZA
/** the total page number */ g&30@D"
privateint totalPage; mw1|>*X&R
kU5chltGF
/** the number of current page */ <ZV !fn
privateint currentPage; :3# t;
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/** the begin index of the records by the current ,nELWzz%{
nRmZu\(Ow|
query */ A9[ELD>p
privateint beginIndex; x;cjl6Acm
x\m !3
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/** The default constructor */ 9_mys}+
public Page(){ "=uphBZog
eh-/,vmRa
} HV^*_
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/** construct the page by everyPage $DOBC@xxzT
* @param everyPage [C]u!\(IF
* */ =*aun&
public Page(int everyPage){ H"H&uA9"
this.everyPage = everyPage; 6jiz$x
} jMvWS71
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/** The whole constructor */ IZV D.1
public Page(boolean hasPrePage, boolean hasNextPage, .OHjn|
{VPF2JFB[
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int everyPage, int totalPage, ZCZY gf@
int currentPage, int beginIndex){ mRT`'fxK
this.hasPrePage = hasPrePage; R30{/KK
this.hasNextPage = hasNextPage; m
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this.everyPage = everyPage; (q!tI*}
this.totalPage = totalPage; AK/_^?zA s
this.currentPage = currentPage; xA-O?s"CY
this.beginIndex = beginIndex; RSLMO8
} Jp<Y2-
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/** BK>uJv-qU
* @return .r/6BDE"
* Returns the beginIndex. zice0({iJ
*/ Azun"F_f
publicint getBeginIndex(){ C~.7m-YW
return beginIndex; W[]N.d7G
} 5sD\4 g)HK
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/** :_%
* @param beginIndex ^h
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* The beginIndex to set. y5L%_
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*/ |@]`" k
publicvoid setBeginIndex(int beginIndex){ }%B^Vl%ZZ
this.beginIndex = beginIndex; 8m0GxgS
} F)mlCGv:R
X0Q};,
/** _
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* @return URbu=U
* Returns the currentPage. FTx&] QN?
*/ Y3+GBqP
publicint getCurrentPage(){ jrGVC2*rD
return currentPage; )E<<