Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ]iuM2]
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ":*PC[)W
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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 _gB`;zo
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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 EW{z?/
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分页支持类: |Q^ZI
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java代码: 2@o_7w98
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package com.javaeye.common.util; 85l 1
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import java.util.List; R R><so%
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publicclass PaginationSupport { Te~"\`omJ3
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publicfinalstaticint PAGESIZE = 30; uRQm.8b
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privateint pageSize = PAGESIZE; \CL |=8[2
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privateList items; k=O2s'F`
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privateint totalCount; /b20!3
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privateint[] indexes = newint[0]; SG8H~]CO)
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privateint startIndex = 0; @YP\!#"8
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public PaginationSupport(List items, int \@Gyl_6^
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totalCount){ SHPaSq'&N
setPageSize(PAGESIZE); Rs:<'A
setTotalCount(totalCount); _$By c(.c
setItems(items); Wy,DA^\ef
setStartIndex(0); "TKf"zc
} zGu(y@o
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public PaginationSupport(List items, int L*9^-,
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totalCount, int startIndex){ /g712\?M4
setPageSize(PAGESIZE); N<:5 r
setTotalCount(totalCount); L._I"g5 H9
setItems(items); Nm#VA.~
setStartIndex(startIndex); $g
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} AL}c-#GG
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public PaginationSupport(List items, int z?h\7
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totalCount, int pageSize, int startIndex){ tOwwgf
setPageSize(pageSize); O%A:2Y79
setTotalCount(totalCount); Nc[>CgX"@
setItems(items); LS4c|Dv
setStartIndex(startIndex); oDx*}[/
} }+QgRGQ
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publicList getItems(){ X_|8CD-@6
return items; NDU,9A.P
}
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publicvoid setItems(List items){ xzy7I6X
this.items = items; YU[93@mCh
} 8[ 1D4d
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publicint getPageSize(){ `Qv7aY
return pageSize; O qY8\>f-
} B>t$Z5Q^X
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publicvoid setPageSize(int pageSize){ 9C$b^wHd
this.pageSize = pageSize; 8=T;R&U^M
} pQ*9)C
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publicint getTotalCount(){ WhSQ>h!@s
return totalCount; +XJj:%yt
} u=jF\W9
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publicvoid setTotalCount(int totalCount){ f/?#
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if(totalCount > 0){ _C&2-tnp
this.totalCount = totalCount; -f z
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int count = totalCount / .jZmQtc
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pageSize; [U]*OQH`e
if(totalCount % pageSize > 0) A"\kdxC
count++; 4t|g G`QW7
indexes = newint[count]; Vur$t^zE
for(int i = 0; i < count; i++){ >yg mE`g
indexes = pageSize * R"Hhc(H
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} g[44YrRD
}else{ kG
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this.totalCount = 0; kW4/0PD
} -wC;pA#o
} z6B/H2
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publicint[] getIndexes(){ ={W;8BUV%^
return indexes; 8}\VlH]
} .Frc:Y{
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publicvoid setIndexes(int[] indexes){ B+iVK(j'[v
this.indexes = indexes; 1SP)`Q
} '73dsOTIT
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publicint getStartIndex(){ Iu jly f
return startIndex; ?a7PxD.
} jB:$+k|~.
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publicvoid setStartIndex(int startIndex){ X7?p$!M6;B
if(totalCount <= 0) :qc@S&v@]
this.startIndex = 0; ~{0:`)2FQ
elseif(startIndex >= totalCount) a:Y6yg%1>
this.startIndex = indexes \kvd;T#t6
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[indexes.length - 1]; 7qA0bUee5
elseif(startIndex < 0) nY'0*:'u
this.startIndex = 0; 1<fS&)^W
else{ y!6B Gz
this.startIndex = indexes \$/)o1SG
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[startIndex / pageSize]; yN5g]U.Q
} 4cRF3$amd
} wP/&k`HQ#i
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publicint getNextIndex(){ `g<@F^x5
int nextIndex = getStartIndex() + 7u6o~(
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pageSize; "2i{ L '
if(nextIndex >= totalCount) ZvpcjP
return getStartIndex(); .|JJyjRA+
else v98=#k!F
return nextIndex; Mhm3u
} fB:9:NX
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publicint getPreviousIndex(){ f'0n^mSP
int previousIndex = getStartIndex() - X,IjM&o"Y
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pageSize; `L`qR,R
if(previousIndex < 0) Ah;2\0|t
return0; ;3U-ghj
else & 1p\.Y
return previousIndex; Jor>YB`X
} -ZlBg~E
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} ]iRE^o6
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抽象业务类 U[*VNJSp
java代码: F^7qLvh
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/** (wEaa'XL
* Created on 2005-7-12 m vO!Y
*/ }=z_3JfO
package com.javaeye.common.business; @*]l.F
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import java.io.Serializable; }&I\a
import java.util.List; ]>E*s3h
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import org.hibernate.Criteria; 9W:oo:dK F
import org.hibernate.HibernateException; P9p:x6
import org.hibernate.Session; mcy\nAf5%
import org.hibernate.criterion.DetachedCriteria; L3JFQc/oh~
import org.hibernate.criterion.Projections; +>/ariRr
import rdhK&5x*
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org.springframework.orm.hibernate3.HibernateCallback; _Db=I3.HJ
import vH%AXzIA
<vJPKQ`=:
org.springframework.orm.hibernate3.support.HibernateDaoS K*&M:u6E
seC]=UJh#>
upport; eqU2>bIf
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import com.javaeye.common.util.PaginationSupport; RbzSQr>a\
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public abstract class AbstractManager extends ye:pGa w
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HibernateDaoSupport { e:fp8 k<
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privateboolean cacheQueries = false; PElC0qCn[
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privateString queryCacheRegion; Xf!@uS6<X
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publicvoid setCacheQueries(boolean <nlZ?~%}
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cacheQueries){ [bk2RaX:i
this.cacheQueries = cacheQueries; +%Q:
} ,A`d!{]5
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publicvoid setQueryCacheRegion(String zI$^yk-vn
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queryCacheRegion){ l9KLP
this.queryCacheRegion = }IO<Dq=[
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queryCacheRegion; +PgUbr[p
} 5LdVcXf
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publicvoid save(finalObject entity){ hr_ 5D
getHibernateTemplate().save(entity); aDmyr_f$
} 'kb5pl~U
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publicvoid persist(finalObject entity){ T6m#sVq
getHibernateTemplate().save(entity); ,@kD9n5#
} 1^XuH('
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publicvoid update(finalObject entity){ d~F`q7F'?]
getHibernateTemplate().update(entity); Z:DEET!c'k
} RO[Ko-m|/N
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publicvoid delete(finalObject entity){ $&~/`MxE
getHibernateTemplate().delete(entity); O4RNt,?l
} _G%]d$2f`
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publicObject load(finalClass entity, W&CQ87b
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finalSerializable id){ 5v <>%=
return getHibernateTemplate().load c.-h'1
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(entity, id); _a1 =?
} WA}<Zme3[
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publicObject get(finalClass entity, xxkUu6x#
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finalSerializable id){ Atsi}zTR\
return getHibernateTemplate().get jXA!9_L7
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(entity, id); b?9c\-}
} i{[=N9U5o
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publicList findAll(finalClass entity){ uw!
return getHibernateTemplate().find("from IN=pki|.
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" + entity.getName()); |T?wM/
} sq TBlP
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publicList findByNamedQuery(finalString KilgeN:
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namedQuery){ 8|^dM$
return getHibernateTemplate Ww5c9orXn
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().findByNamedQuery(namedQuery); [
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} 0^'A^
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publicList findByNamedQuery(finalString query, ^kZfE"iE2
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finalObject parameter){ :VwU2
return getHibernateTemplate . K`OEdr<
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().findByNamedQuery(query, parameter); [-o`^;
} Gr9/@U+
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publicList findByNamedQuery(finalString query, Fe
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finalObject[] parameters){ Yhdt"@;..
return getHibernateTemplate 1HQh%dZZ
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().findByNamedQuery(query, parameters); O@JgVdgf
} kk]f*[Zi5
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publicList find(finalString query){ H.-jBFt}
return getHibernateTemplate().find ~RcI+jR)
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(query); b3(pRg[Fp
} i9Fg
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publicList find(finalString query, finalObject 9~+A<X]Hd
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parameter){ n]M1'yU
return getHibernateTemplate().find \b{Aj,6,
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(query, parameter); \zj _6Os
} s_]p6M
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public PaginationSupport findPageByCriteria ").MU[q%Y
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(final DetachedCriteria detachedCriteria){ NGYliP,.6
return findPageByCriteria 5dffFe
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 3:Bwf)*
}
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public PaginationSupport findPageByCriteria .C^1.)
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(final DetachedCriteria detachedCriteria, finalint e$F]t*)Xa
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startIndex){ =Y`P}vI]w%
return findPageByCriteria Rz}?@zh_8
n}==
(detachedCriteria, PaginationSupport.PAGESIZE, \PS{/XK
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startIndex); ^l1tQnj)7
} =H*}{'#
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public PaginationSupport findPageByCriteria U3r[ysf
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(final DetachedCriteria detachedCriteria, finalint `@GqD
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pageSize, Z09FW>"u
finalint startIndex){ K/RQ-xd4
return(PaginationSupport) jvx9b([<sG
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getHibernateTemplate().execute(new HibernateCallback(){ 216+ tX5Z
publicObject doInHibernate M=[ /v/M=
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(Session session)throws HibernateException { H
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Criteria criteria = i^P@?
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detachedCriteria.getExecutableCriteria(session); 97:1L4w.(
int totalCount = * d6[kY
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((Integer) criteria.setProjection(Projections.rowCount h&4ufx6
a] :tn:q
()).uniqueResult()).intValue(); U$a Eby.
criteria.setProjection SsA;T5:6
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(null); x_1JQDE
List items = }*Qd]\fy
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criteria.setFirstResult(startIndex).setMaxResults "sLdkd}dj
<4jQbY;
(pageSize).list(); y7SOz'd
PaginationSupport ps = :0o
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new PaginationSupport(items, totalCount, pageSize, Tk s;,C
{9TWPB/>
startIndex); MhC74G
return ps; 5zJkPki
} E/cA6*E[.<
}, true); }GvoQ#N
} G%)?jg@EA
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public List findAllByCriteria(final GypZ!)1
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DetachedCriteria detachedCriteria){ 4mOw[}@A
return(List) getHibernateTemplate t
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().execute(new HibernateCallback(){ Q0~5h?V'
publicObject doInHibernate M<JJQh5
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(Session session)throws HibernateException { Cus=UzL
Criteria criteria = m%V+px
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detachedCriteria.getExecutableCriteria(session); WrbDB-uM
return criteria.list(); J#Fe"
} }]vj"!?a
}, true); m^zx&
} m}.ru)^p
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public int getCountByCriteria(final WO*yJ`9]
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DetachedCriteria detachedCriteria){ )6)|PzMQ'
Integer count = (Integer) j)\g0u6
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getHibernateTemplate().execute(new HibernateCallback(){ THHrGvb
publicObject doInHibernate tW5\Ktjno
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(Session session)throws HibernateException { ]i*q*]x2u
Criteria criteria = &QE^i%6>\
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detachedCriteria.getExecutableCriteria(session); [i[G" %Q
return vZ
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criteria.setProjection(Projections.rowCount jIE>t5 fy
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()).uniqueResult(); =1^a/
} tYIHsm\b
}, true); #%VprcEK
return count.intValue(); (PGmA>BT
} (Br$(XJoK}
} ?>MD /l(l
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用户在web层构造查询条件detachedCriteria,和可选的 ,r5<v_
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 d_J?i]AP|'
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PaginationSupport的实例ps。 mDE{s",q/
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ps.getItems()得到已分页好的结果集 M)Rp+uQ
ps.getIndexes()得到分页索引的数组
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ps.getTotalCount()得到总结果数 Te'^O,C)y$
ps.getStartIndex()当前分页索引 hx4!P( o1
ps.getNextIndex()下一页索引 g|<)J-`Q
ps.getPreviousIndex()上一页索引 =khjD[muC
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 >|0yH9af
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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 1ISA^< M
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一下代码重构了。 uW>AH@Pij
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我把原本我的做法也提供出来供大家讨论吧: &Wd,l$P<O
2?t(%uf]
首先,为了实现分页查询,我封装了一个Page类: e::5|6x
java代码: hPr
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/*Created on 2005-4-14*/ ]p'Qk
package org.flyware.util.page; N["c*=x
ZfT%EPoZ:
/** 5YS`v#+
* @author Joa vlIdi@V
* ^'EEry
*/ :^%soEi
publicclass Page { I-/PzL<W P
@mP@~
/** imply if the page has previous page */ /l(:H
privateboolean hasPrePage; q,nj|9z V
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/** imply if the page has next page */ )2S0OY.
privateboolean hasNextPage; |<y[gj4`T/
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/** the number of every page */ ([f6\Pw\ <
privateint everyPage; !c6lP'U
pvmm" f
/** the total page number */ [-6j4D
privateint totalPage; P]Gsc
zN5i}U=|r
/** the number of current page */ 9q* sR1
privateint currentPage; }QJE9;<e
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/** the begin index of the records by the current Fg#*rzA
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query */ Ce 5
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privateint beginIndex; )>\Ne~%
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/** The default constructor */ uU5:,Wy+dg
public Page(){ fiw~"2U
)%^ oR5W
} /c'#+!19
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/** construct the page by everyPage $%1[<}<
* @param everyPage +e?ixvld
* */ JC =Bxv
public Page(int everyPage){ <