Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 LZ^sc
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 `GH6$\:
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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 >o(*jZ
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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 pvcf_w`n
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分页支持类: ;/ p)vR
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java代码: l1YyZ ^Z
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package com.javaeye.common.util; z#O{rwnl
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import java.util.List; =(zk-J<nY
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publicclass PaginationSupport { G.c s-f
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publicfinalstaticint PAGESIZE = 30; N[=nh)m7b
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privateint pageSize = PAGESIZE; k%uRG_
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privateList items; =(v/pLLK?
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privateint totalCount; sd>#Hn
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privateint[] indexes = newint[0]; J2yq|n?2gq
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privateint startIndex = 0; a'Aru^el
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public PaginationSupport(List items, int V8&%f xn+
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totalCount){ H2|w
setPageSize(PAGESIZE); 69rVW~Z
setTotalCount(totalCount); $8X?|fV)
setItems(items); vChkSY([
setStartIndex(0); #16)7
} vE{QN<6T
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public PaginationSupport(List items, int |h8C}P&Z
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totalCount, int startIndex){ D*_ F@}=
setPageSize(PAGESIZE); /l@ 7MxE
setTotalCount(totalCount); Jg: Uv6eN+
setItems(items); >uxak2nM-
setStartIndex(startIndex); vzy/Rq
} IHf
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public PaginationSupport(List items, int 0]NjsOU=
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totalCount, int pageSize, int startIndex){ &>sG xK
setPageSize(pageSize); Jtc?p{
setTotalCount(totalCount); h]G}E9\l
setItems(items); m;8_A|$A
setStartIndex(startIndex); {}vW=
} >}_c<`:
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publicList getItems(){ <XGOcekG
return items; @4hxGk=
} *$uKg zv3
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publicvoid setItems(List items){ <K|_M)/9
this.items = items; |
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} mrk Q20D
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publicint getPageSize(){ 6lsU/`.
return pageSize; )Z"7^i
} k'
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publicvoid setPageSize(int pageSize){ w QwY_ _
this.pageSize = pageSize; N4'b]:`n
} 67Ge}6*2pd
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publicint getTotalCount(){ p8o%H-Xk
return totalCount; h jWRU#
} M[HPHNsA&
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publicvoid setTotalCount(int totalCount){ h4!$,%"''
if(totalCount > 0){ ;%Jp@'46
this.totalCount = totalCount; {/ZB>l@D>8
int count = totalCount /
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pageSize; 1*G7Uh@K}
if(totalCount % pageSize > 0) T3wR0,
count++; ,tmo6D6 2
indexes = newint[count]; I0GL/a4s
for(int i = 0; i < count; i++){ B% BO
indexes = pageSize * kRZ(
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} }+ I
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}else{ t55CT6Se
this.totalCount = 0; w{#%&e(q"
} V|<qO-#.
} gO_^{>2
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publicint[] getIndexes(){ SAly~(r?/
return indexes; |M0 XLCNd_
} Lp1wA*
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publicvoid setIndexes(int[] indexes){ +1F@vag7
this.indexes = indexes; li,kW`j+t
} eAm7*2
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publicint getStartIndex(){ e Hd{'J<
return startIndex; [uZU p*.V
} />.&
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publicvoid setStartIndex(int startIndex){ st/Tb/
if(totalCount <= 0) f}nGWV%,
this.startIndex = 0; W >;AMun
elseif(startIndex >= totalCount) nolTvqMT
this.startIndex = indexes 3J%jD
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[indexes.length - 1]; ||9f@9
elseif(startIndex < 0) ?W%3>A
this.startIndex = 0; Wb/@~!+i`
else{ 5j,)}AYO
this.startIndex = indexes .J&~u0g
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[startIndex / pageSize]; JI@~FD&
} tj{rSg7{
} >Py; 6K
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publicint getNextIndex(){ +-
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int nextIndex = getStartIndex() + -D38>#Y
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pageSize; Tb:n6a@
if(nextIndex >= totalCount) @b-?KH
return getStartIndex(); 'xr\\Cd9s
else 1[u{3lQ
return nextIndex; $5%tGFh
} !OC?3W:^_
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publicint getPreviousIndex(){ qd!$ nr
int previousIndex = getStartIndex() - AUzJ:([V
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pageSize; ^=.|\
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if(previousIndex < 0) PN+,M50;1
return0; nLdI>c9R
else };29'_.."x
return previousIndex; k&yy_r
} {K_YW
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} j$N`JiKM
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抽象业务类 h9g5W'.#
java代码: V@e0VV3yx%
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/** Kd7OnU
* Created on 2005-7-12 SYa!IL-B
*/ 2R:['QT
package com.javaeye.common.business; NVJvCs)3f
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import java.io.Serializable; ^9qncvV
import java.util.List; ;l}TUo
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import org.hibernate.Criteria; w}oH]jVKL6
import org.hibernate.HibernateException; l&;#`\s!V
import org.hibernate.Session; p.8G]pS
import org.hibernate.criterion.DetachedCriteria; qhL e[[>
import org.hibernate.criterion.Projections; jpOi Eo
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org.springframework.orm.hibernate3.HibernateCallback; yd`.Rb&V
import k
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org.springframework.orm.hibernate3.support.HibernateDaoS l.>QO ;
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upport; 6i{W=$RQ
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import com.javaeye.common.util.PaginationSupport; lZ/Yp~2S
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public abstract class AbstractManager extends b`18y cVME
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HibernateDaoSupport { :+!hR4Z~\;
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privateboolean cacheQueries = false; \T<?=A
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privateString queryCacheRegion; w9i1ag
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publicvoid setCacheQueries(boolean ]U'KYrh
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cacheQueries){ LD]XN'?"W
this.cacheQueries = cacheQueries; gd/W8*NFR
} l,,5OZw
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publicvoid setQueryCacheRegion(String t6s#19g
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queryCacheRegion){ a;([L8^7$l
this.queryCacheRegion = @Je{;1
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queryCacheRegion; eUx|_*`
} Y~fds#y0
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publicvoid save(finalObject entity){ ]e)<CE2
getHibernateTemplate().save(entity); ]7c715@
} IuB0C!'
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publicvoid persist(finalObject entity){ q$>At}4
getHibernateTemplate().save(entity); /d8PDc "
} }$81FSKh
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publicvoid update(finalObject entity){ GP`_R
getHibernateTemplate().update(entity); '0/t |V<
} 8[2^`g
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publicvoid delete(finalObject entity){ :|N5fkhN
getHibernateTemplate().delete(entity); A4 o'EQ?~
} Ko2{[%
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publicObject load(finalClass entity, [fO \1J
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finalSerializable id){ SP5/K3t-*
return getHibernateTemplate().load U1J?o#(
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(entity, id); vKol@7%N
} a&wl-
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publicObject get(finalClass entity, &kYg
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finalSerializable id){ V\X.AGc
return getHibernateTemplate().get R279=sO,J
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(entity, id); vezX/x D?
} ^5j9WV
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publicList findAll(finalClass entity){ $WrDZU 2z
return getHibernateTemplate().find("from NR^z!+oSR
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" + entity.getName()); V 7%rKK
} w*\)]bTs
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publicList findByNamedQuery(finalString EcBSi995dj
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namedQuery){ _z{:Q
return getHibernateTemplate +hV7o!WxC
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().findByNamedQuery(namedQuery); YM/GSSq
} N1+%[Uh9)
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publicList findByNamedQuery(finalString query, :hCp@{
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finalObject parameter){ 8L6!CP_!
return getHibernateTemplate %R-"5?eTtu
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().findByNamedQuery(query, parameter); SWPr5h
} $iupzVrro
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publicList findByNamedQuery(finalString query, u ; f~
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finalObject[] parameters){ IF$f^$
return getHibernateTemplate y]+i.8[
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().findByNamedQuery(query, parameters); kd9hz-*
} /i"L@t)\t
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publicList find(finalString query){ E@Q+[~H }
return getHibernateTemplate().find ^MKvZ DOP
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(query); D CcM~
} '8}*erAg
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publicList find(finalString query, finalObject : H0+} =
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parameter){ s+h`,gg9
return getHibernateTemplate().find BC9rsb
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(query, parameter); Qt+ K,LY
} |Q?IV5%$
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public PaginationSupport findPageByCriteria oV&AJ=|\
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(final DetachedCriteria detachedCriteria){ /P Qz$e-!Y
return findPageByCriteria \%K< S
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); cAC]%~orx
} Z)~.OqRw]
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public PaginationSupport findPageByCriteria AQDT6E:
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(final DetachedCriteria detachedCriteria, finalint *"d"
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startIndex){ Fi14_{
return findPageByCriteria TG=) KS
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(detachedCriteria, PaginationSupport.PAGESIZE, ^%VMp>s
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startIndex); FI`][&]V
} \/xWsbG\
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public PaginationSupport findPageByCriteria Rs$k3
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(final DetachedCriteria detachedCriteria, finalint 4nN%5c~=
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pageSize, PxhB=i!'$
finalint startIndex){ _{_ybXG|
return(PaginationSupport) }*4 XwUM e
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getHibernateTemplate().execute(new HibernateCallback(){ vSb$gl5H
publicObject doInHibernate !iN=py
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(Session session)throws HibernateException { w4\b^iJz
Criteria criteria = m}54yo
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detachedCriteria.getExecutableCriteria(session); iSCv/Gb:,
int totalCount = \tc4DS
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((Integer) criteria.setProjection(Projections.rowCount F.<sKQ&A
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()).uniqueResult()).intValue(); MDZ,a0?4t
criteria.setProjection D1}Bn2BM$
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(null); ,_,Z<X/
List items = T>7$<ulm
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criteria.setFirstResult(startIndex).setMaxResults <7NY.zvwk]
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(pageSize).list(); :P1 J> dcG
PaginationSupport ps = ]?whx&+
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new PaginationSupport(items, totalCount, pageSize, s.d }*H-o
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startIndex); 'H+H4(
return ps; />=)=CGv;
} ..`J-k
}, true); 2Dgulx5kGZ
} o?BcpWp
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public List findAllByCriteria(final r-&Rjg
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DetachedCriteria detachedCriteria){ +F=j1*'&
return(List) getHibernateTemplate `CP#S7W^
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().execute(new HibernateCallback(){ KAVe~j"
publicObject doInHibernate 5v
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(Session session)throws HibernateException { r`Y[XzT9
Criteria criteria = *8{PoD
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detachedCriteria.getExecutableCriteria(session); 'id]<<F
return criteria.list(); puEuv6F
} iOXxxP%#
}, true); *{5p/}p
} K: hZ
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public int getCountByCriteria(final \X1?,gV_
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DetachedCriteria detachedCriteria){ 7VQ|3`!<
Integer count = (Integer) \ <b-I
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getHibernateTemplate().execute(new HibernateCallback(){ pxy=edd
publicObject doInHibernate JG\T2/b
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(Session session)throws HibernateException { {=};<;_F
Criteria criteria = Qk 2^p^ T6
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detachedCriteria.getExecutableCriteria(session); N.R,[K
return ?"-%>y@w
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criteria.setProjection(Projections.rowCount nW#UBtZ
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()).uniqueResult(); 6%?bl{pNn
} Z&BJ/qk
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}, true); ]U?)_P@}
return count.intValue(); /<ODP6Yy;
} GxjmHo
} BSU%.tmI
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用户在web层构造查询条件detachedCriteria,和可选的 H5wzzSV!:B
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 K`}8fU
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PaginationSupport的实例ps。 B q/<kEgM
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ps.getItems()得到已分页好的结果集 _ zM/>Qa
ps.getIndexes()得到分页索引的数组 nM]Sb|1:
ps.getTotalCount()得到总结果数 -!w({rP
ps.getStartIndex()当前分页索引 qI (<5Wxl
ps.getNextIndex()下一页索引 :K
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ps.getPreviousIndex()上一页索引 )> >Tj7
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 dZ]['y%
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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 0i%r+_E_
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一下代码重构了。 9*`(*>S
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我把原本我的做法也提供出来供大家讨论吧: p@`]9tLP(K
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首先,为了实现分页查询,我封装了一个Page类: /O@TqH
java代码: _p<]jt
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/*Created on 2005-4-14*/ W#^W1j>_G
package org.flyware.util.page; ~%.<rc0
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/** bm`x;M^M
* @author Joa X1LwIa>
* _o,Mji|
*/ c_p7vvI&c0
publicclass Page { 60R Yw9d%0
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} {m<8c
/** imply if the page has previous page */ ^)wTCkH&y
privateboolean hasPrePage; ONr}{T%@/
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/** imply if the page has next page */ #H8% BZyV
privateboolean hasNextPage; ~6bf-Wg'X
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/** the number of every page */ 5}v<?<l9\
privateint everyPage; TDqH"q0
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/** the total page number */ 3fdx&}v/
privateint totalPage; o'#ow(X
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/** the number of current page */ %t.L;G
privateint currentPage;
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/** the begin index of the records by the current ?^f=7e8]
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query */ vZ0K1UTEXY
privateint beginIndex; e"I+5r",
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