Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 mE+*)gb:Rd
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 n]._uza
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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 fDv2JdiU
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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 ,LHn90S
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。 ~~D{spMVO
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分页支持类: {'7B6
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java代码: 8V'~UzK
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package com.javaeye.common.util; }|h# \$w
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import java.util.List; ^UP`%egR
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publicclass PaginationSupport { P78g/p T
@ a! #G
publicfinalstaticint PAGESIZE = 30; Dj"F\j 1
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privateint pageSize = PAGESIZE; `KZm0d{H
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privateList items; G30-^Tr
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privateint totalCount; =9H7N]*h
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privateint[] indexes = newint[0]; KjD/o?JUr
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privateint startIndex = 0; ?g_3 [Fk
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public PaginationSupport(List items, int 'TTLo|@"-
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totalCount){ G<L;4nA)
setPageSize(PAGESIZE); yuh *
setTotalCount(totalCount); <$D`Z-6
setItems(items); =*oJEy"
setStartIndex(0); N=V==Dbu-
} P\E<9*V
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public PaginationSupport(List items, int 9)l$ aBa
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totalCount, int startIndex){ )HEa<P^kJl
setPageSize(PAGESIZE); [:7'?$
setTotalCount(totalCount); xK>*yV
setItems(items); "BM#4
setStartIndex(startIndex); fW?vdYF
} P0;n9>g
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public PaginationSupport(List items, int |Tv#4st
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totalCount, int pageSize, int startIndex){ KYB`D.O
setPageSize(pageSize); s
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setTotalCount(totalCount); #$.;'#u'so
setItems(items); &sl0W-;0
setStartIndex(startIndex); w2?3wrP3
} >R'F,
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publicList getItems(){ x'8x
return items; p'Y^X
} })'B<vq
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publicvoid setItems(List items){ 0j^Kgx
this.items = items; B`EJb71^Xy
} Lc}LGq!
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publicint getPageSize(){ N:^n('U&j
return pageSize; kXViWOXU^
} EfqX
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publicvoid setPageSize(int pageSize){
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this.pageSize = pageSize; %U/(|wodd
} %[GsD9_-
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publicint getTotalCount(){ 2_>N/Z4T
return totalCount; W<'m:dq
} 91/Q9xY
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publicvoid setTotalCount(int totalCount){ % 7hrk
if(totalCount > 0){ Kf3"Wf^q
this.totalCount = totalCount; n3WlZ!$
int count = totalCount / aHD]k8m z
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pageSize; G0Iw-vf
if(totalCount % pageSize > 0) M*0]ai|;
count++; &s(^@OayE
indexes = newint[count]; P1!qbFDv8
for(int i = 0; i < count; i++){ )705V|v
indexes = pageSize * 1Yq!~8
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i; \$K20)
} 5%"V[lDx@
}else{ F~-(:7j
this.totalCount = 0; u* eV@KK!
} /l3V3B7
} GblA9F7
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publicint[] getIndexes(){ -E[Kml~U
return indexes; I^.Om])
} O2V
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publicvoid setIndexes(int[] indexes){ poE0{HOU
this.indexes = indexes; ~g91Pr
} #<fRE"v:Q
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publicint getStartIndex(){ (g]!J_Z"
return startIndex; 8\^R~K`sY
} Xg6Jh``
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publicvoid setStartIndex(int startIndex){ G/E+L-N#`
if(totalCount <= 0) 9
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this.startIndex = 0; A`%k:@
elseif(startIndex >= totalCount) }FROB/
this.startIndex = indexes G[ PtkPSJ
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[indexes.length - 1]; gT.sjd
elseif(startIndex < 0) q1x`Bj
this.startIndex = 0; aqZi:icFa
else{ yZY \MB/
this.startIndex = indexes ~ah~cwmpS
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[startIndex / pageSize]; [>I<#_^~
} ;fTKfa
} ;?Tbnn Wn
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publicint getNextIndex(){ ,&A7iO
int nextIndex = getStartIndex() + XT%nbh&y
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pageSize; l'rja.\
if(nextIndex >= totalCount) QW~E&B%
return getStartIndex(); QE+g
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else 4\N;2N
return nextIndex; =j_4S<
} 1s&zMWC
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publicint getPreviousIndex(){ eb\K "ec"
int previousIndex = getStartIndex() - ! I:%0D
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pageSize; e)k9dOR
if(previousIndex < 0) F{e@W([
return0; e2Pcm_Ahv*
else a5"D @E
return previousIndex; 5V~oIL
} &m7]v,&
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} P`+{@@
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抽象业务类 m9WDT
java代码: 7F7{)L
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/**
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* Created on 2005-7-12 O63<AY@
*/ jOunWv|
package com.javaeye.common.business; uAq~=)F>,
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import java.io.Serializable; Fyx|z'4b
import java.util.List; IPKbMlV#d
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import org.hibernate.Criteria; i>A s;*
import org.hibernate.HibernateException; Zn+.;o)E<
import org.hibernate.Session; 4[r0G+
import org.hibernate.criterion.DetachedCriteria; P )"m0Lu<
import org.hibernate.criterion.Projections; kCF>nt@
import ?
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org.springframework.orm.hibernate3.HibernateCallback; ^7cGq+t
import [PM2\#K
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org.springframework.orm.hibernate3.support.HibernateDaoS 6I4\q.^qw
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upport; r'r%w#=`t
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import com.javaeye.common.util.PaginationSupport; 6:5I26
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public abstract class AbstractManager extends O,
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HibernateDaoSupport { )p0^zv{
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privateboolean cacheQueries = false; ]=I@1B;_m
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privateString queryCacheRegion; Wx}8T[A}
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publicvoid setCacheQueries(boolean DB|Y
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cacheQueries){ |Nn)m
this.cacheQueries = cacheQueries; "@@u3`#
} `Bp.RXsd*
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publicvoid setQueryCacheRegion(String +b<FO+E_
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queryCacheRegion){ 7M!I8C0!aO
this.queryCacheRegion = )JLdO*H
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queryCacheRegion; Y|f[bw
} <tNBxa$gS
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publicvoid save(finalObject entity){ pfD c9PMj
getHibernateTemplate().save(entity); -t'jNR'
} Y'S%O/$
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publicvoid persist(finalObject entity){ 5h-SCB>P
getHibernateTemplate().save(entity); Tod&&T'UW
} &\WSQmtto
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publicvoid update(finalObject entity){ zuad~%D<I
getHibernateTemplate().update(entity); T{.pM4Hd
} ?m}s4a
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publicvoid delete(finalObject entity){ m)t;9J5
getHibernateTemplate().delete(entity); 2j88<Yh]H
} rk2j#>l$4
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publicObject load(finalClass entity, z6=Z\P+
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finalSerializable id){ kR-SE5`Jk
return getHibernateTemplate().load Nho>f
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(entity, id); VU(v3^1"
} fI}to&qk
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publicObject get(finalClass entity, W0@n/U
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finalSerializable id){ eK?MKe
return getHibernateTemplate().get t7Iv?5]N
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(entity, id); {yHCXFWlS
} {0wIR_dGX
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publicList findAll(finalClass entity){ JV^=v@Z3
return getHibernateTemplate().find("from rNWw?_H-H(
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" + entity.getName()); wx=
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} |O\s|H
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publicList findByNamedQuery(finalString +US!YU
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namedQuery){ M#4pE_G
return getHibernateTemplate )9{0]u;9
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().findByNamedQuery(namedQuery); d9fC<Tp
} XH 4
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publicList findByNamedQuery(finalString query, r1`x=r
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finalObject parameter){ f;o5=)Y
return getHibernateTemplate eCU:Q
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().findByNamedQuery(query, parameter); _ @NL;w:!
} kzQ+j8.,U
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publicList findByNamedQuery(finalString query, pHXm>gTd,J
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finalObject[] parameters){ b.JuI
return getHibernateTemplate VK\X&Y3l
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().findByNamedQuery(query, parameters); DZ'P@f)]
} {0Yf]FQb-a
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publicList find(finalString query){ jjB~G^n
return getHibernateTemplate().find taHJ u b
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(query); ,F8 Yn5h
} gZ3u=uME
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publicList find(finalString query, finalObject mW(W\'~_~
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parameter){ ~zJbK. _
return getHibernateTemplate().find by1<[$8r
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(query, parameter); `_Zg3_K.dS
} 36&e.3/#
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public PaginationSupport findPageByCriteria 8?#/o c
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(final DetachedCriteria detachedCriteria){ i4Q@K,$
return findPageByCriteria O'p9u@kc
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); O_muD\
} njB;&N)I
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public PaginationSupport findPageByCriteria ]KKS"0a
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(final DetachedCriteria detachedCriteria, finalint T?CdZc.
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startIndex){ lBLARz&c#
return findPageByCriteria 'A=^Se`=
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(detachedCriteria, PaginationSupport.PAGESIZE, 9IdA%RM~mH
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startIndex); $t'MSlF
} y4
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public PaginationSupport findPageByCriteria }z'8Bu
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(final DetachedCriteria detachedCriteria, finalint $lfn(b,
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pageSize, 6m/r+?'
finalint startIndex){ U/66L+1
return(PaginationSupport) [x=s(:qy
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getHibernateTemplate().execute(new HibernateCallback(){ Fo (fWvz
publicObject doInHibernate eH'av}
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(Session session)throws HibernateException { &T?RZ2
Criteria criteria = oz\!V*CtK
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detachedCriteria.getExecutableCriteria(session); q5J5>
int totalCount = Gt8M&S-;
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((Integer) criteria.setProjection(Projections.rowCount o=:9y-nH
7JD' )
()).uniqueResult()).intValue(); ?8H8O %Z8
criteria.setProjection G/y5H;<9M
]!W=^!
(null); A_"w^E{P
List items = &)#
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criteria.setFirstResult(startIndex).setMaxResults /e5O"@
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(pageSize).list(); IEL%!RFG
PaginationSupport ps = ;RZ )
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new PaginationSupport(items, totalCount, pageSize, P8OaoPj
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startIndex); f <Zxz9
return ps; PV.Xz0@R
} H*?t^
}, true); Ea=8}6`s
} D=A&+6B@-
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public List findAllByCriteria(final Si4!R+4w
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DetachedCriteria detachedCriteria){ 4@+`q *
return(List) getHibernateTemplate CCs%%U/=
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().execute(new HibernateCallback(){ W 8<&gh+
publicObject doInHibernate kP=eW_0D
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(Session session)throws HibernateException { ]#iigPZ7
Criteria criteria = @o].He@L<j
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detachedCriteria.getExecutableCriteria(session); ].avItg
return criteria.list(); r8t}TU>C
} j7Yu>cr
}, true); @Myo'{3vF
} YH}'s>xZz
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public int getCountByCriteria(final ^)/0yB
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DetachedCriteria detachedCriteria){ /cUO$m o
Integer count = (Integer) @W.S6;GA\
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getHibernateTemplate().execute(new HibernateCallback(){ ^`i#$
publicObject doInHibernate ^x ]r`b
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(Session session)throws HibernateException { dohA0
Criteria criteria = #H&|*lr
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detachedCriteria.getExecutableCriteria(session); ( ' (K9@}
return GhAlx/K
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criteria.setProjection(Projections.rowCount O0x,lq
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()).uniqueResult(); 4!{KWL`A
} RXMISt3+{y
}, true); /aCc17>2V{
return count.intValue(); 8L=HW G!1
} YR\fa Vk
} l
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用户在web层构造查询条件detachedCriteria,和可选的 Pjf"CW+A
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 }^WdJd]P
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PaginationSupport的实例ps。 3)wN))VBX
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ps.getItems()得到已分页好的结果集 *uRBzO}
ps.getIndexes()得到分页索引的数组 PA{PD.4Du
ps.getTotalCount()得到总结果数 dw>C@c#"
ps.getStartIndex()当前分页索引 R{`(c/%8
ps.getNextIndex()下一页索引 6?gW-1mY
ps.getPreviousIndex()上一页索引 AEI>\Y
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 h]&GLb&<?
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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 .&iawz
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一下代码重构了。 23eX;gL
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我把原本我的做法也提供出来供大家讨论吧: Jl8H|<g~/
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首先,为了实现分页查询,我封装了一个Page类: #4NaL
java代码: S"QWB`W2
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/*Created on 2005-4-14*/ PcMD])Z{G
package org.flyware.util.page; 0cH`;!MZ
St9?RD{4;
/** !x=~g"d<&
* @author Joa QD&`^(X1p
* w$iX.2|9%u
*/ @Sn(lnlB
publicclass Page { mfn,Gjt3O
%)8}X>xq
/** imply if the page has previous page */ =_*Zn(>t`
privateboolean hasPrePage; '?' l;#^i<
KhR8 1\
/** imply if the page has next page */ @l5"nBs<_:
privateboolean hasNextPage; (UD@q>c
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/** the number of every page */ H [\o RId
privateint everyPage; oG?Xk%7&\
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/** the total page number */ 3AtGy'NTp
privateint totalPage; q-2Bt,Y
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/** the number of current page */ hpX9[3
privateint currentPage; ZgcMv,=
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/** the begin index of the records by the current ',@3>T**
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query */ M#6W(|V/
privateint beginIndex; 7hcYD!DS
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/** The default constructor */ oxA<VWUNT
public Page(){ zT]8KA
Af2( 5]
} RWZSQ~
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/** construct the page by everyPage L|7R9+ZG
* @param everyPage ]y'>=a|T
* */ ^A/k)x6
public Page(int everyPage){ g3/W=~r
this.everyPage = everyPage; %p=M;
} G`61~F%
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/** The whole constructor */ YnAm{YyI
public Page(boolean hasPrePage, boolean hasNextPage, lvz7#f L~
azp):*f("
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int everyPage, int totalPage, 5c0 ZRV#
int currentPage, int beginIndex){ \V8PhO;j
this.hasPrePage = hasPrePage; xJ8M6O8
this.hasNextPage = hasNextPage; LckK\`mh
this.everyPage = everyPage; Hg izW
this.totalPage = totalPage; zu{P#~21
this.currentPage = currentPage; ,!y$qVg'\f
this.beginIndex = beginIndex; PiIpnoM
} Vn}0}Jz
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/** AjMh,@
* @return oW*16>IN9l
* Returns the beginIndex. \&3+D8H>n
*/ zP8lN(LA
publicint getBeginIndex(){ 5x4yyb'
return beginIndex; 24*XL,
} Yujiqi]J;
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/** 0@iY:aF
* @param beginIndex IY\5@PVZ
* The beginIndex to set. b9HtR -iR;
*/ 6j]0R*B7`Q
publicvoid setBeginIndex(int beginIndex){ m8hk:4Ae
this.beginIndex = beginIndex; g7`LEF <A
} DU/]
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/** Hk.TM2{w
* @return ;))+>%SGCt
* Returns the currentPage. xy[3u?,&s!
*/ | rtD.,m
publicint getCurrentPage(){ !ons]^km
return currentPage; MaQqs=
} 9vc2VB$
}@q`%uzi
/** FbFPJ !fb
* @param currentPage 37.S\gO]
* The currentPage to set. joAv{Tc
*/ f+)L#>Gl?
publicvoid setCurrentPage(int currentPage){ C1n>M}b
this.currentPage = currentPage; H3=qe I
} s)D;a-F
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/** F/kWHVHU[
* @return g@!V3V
* Returns the everyPage. plstZ,#j
*/ 08\,<9
publicint getEveryPage(){ KBc1{adDx@
return everyPage; )g%d:xI
} `e&Suyf4B
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/** Z0", !6nS
* @param everyPage R.1.)P[
* The everyPage to set. KU(&%|;g
*/ S g![Lsj
publicvoid setEveryPage(int everyPage){ .g<DD)`
this.everyPage = everyPage; z,p~z*4
} wE`]7mA
16( QR-
/** AH7}/Rc
* @return wc4{)qDE
* Returns the hasNextPage. By4<2u38u
*/ '-XXo=>0MV
publicboolean getHasNextPage(){ Ioa$51&
return hasNextPage; jLm ;ty2;
} .[OUI
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/** 2uW;
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* @param hasNextPage iz PDd{[
* The hasNextPage to set. z$. 88^
*/ K
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publicvoid setHasNextPage(boolean hasNextPage){ n 0L^e
this.hasNextPage = hasNextPage; S|N_ o
} _Q 4)X)F
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/** %l[( Iw
* @return E]-/Zbvdv
* Returns the hasPrePage. >}i E(
*/ &B1Wt