Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 5 u0HI
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 &!
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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 6JQ'Ik;$wX
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 6K<K
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分页支持类: ?3xzd P
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java代码: D5HZ2cz|a
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package com.javaeye.common.util; LE>]8[f6S
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import java.util.List; `$C
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publicclass PaginationSupport { $ DSZO!pB
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publicfinalstaticint PAGESIZE = 30; g'qa}/X
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privateint pageSize = PAGESIZE; .h4 \Y A
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privateList items; NPe%F+X
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privateint totalCount; X*Prl l(
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privateint[] indexes = newint[0]; MFAH%Z$
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privateint startIndex = 0; pD#rnp>WWt
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public PaginationSupport(List items, int QW(Mz Hg
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totalCount){ ,>mrPtxN
setPageSize(PAGESIZE); u($!z^h
setTotalCount(totalCount); lv+TD!b
setItems(items); wT8DSq
setStartIndex(0); sI^Xb@'09$
} "mvt>X
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public PaginationSupport(List items, int &AbNWtCV+G
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totalCount, int startIndex){ J,y[[CdH`
setPageSize(PAGESIZE); #KexvP&*
setTotalCount(totalCount); S2VA{9:m
setItems(items); s{\8om'-
setStartIndex(startIndex); Ks`J([(W&
} O*)Vhw'pK
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public PaginationSupport(List items, int ]a*d#
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totalCount, int pageSize, int startIndex){ GM f
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setPageSize(pageSize); 'XP7"
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setTotalCount(totalCount); * kDC liL
setItems(items); 2?ez,*-[
setStartIndex(startIndex); 70tH:Z)"
}
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publicList getItems(){ JL}_72gs
return items; %oa-WmWm
} |AU~_{H
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publicvoid setItems(List items){ 9BBmw(M}
this.items = items; ex (.=X 1
} 3/e.38m|
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publicint getPageSize(){ '3DXPR^B6
return pageSize; -23w2Qt
} YdC6k?tzS
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publicvoid setPageSize(int pageSize){ !_D0vI;
this.pageSize = pageSize; gANuBWh8T
} ][h%UrV
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publicint getTotalCount(){ `FDiX7M
return totalCount; Pz |>"'
} GmEJhr.3`=
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publicvoid setTotalCount(int totalCount){ JZ*/,|1}EC
if(totalCount > 0){ QP8Ei~
this.totalCount = totalCount; j94=hJVKi
int count = totalCount / Eog0TQ+*
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pageSize; g:D>.lKd
if(totalCount % pageSize > 0) wyj{zWRJp
count++; OXSmt
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indexes = newint[count]; q#ClnG*
for(int i = 0; i < count; i++){ D] jzAx
indexes = pageSize * FR4QUk
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} G"U9E5O
}else{ >G*eNn
this.totalCount = 0; kmsb hYM)
} q?oP?cCw
} O-~7b(Z
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publicint[] getIndexes(){ )72+\C[*~r
return indexes; 3kIN~/<R+7
} ?{|q5n
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publicvoid setIndexes(int[] indexes){ B^Nf #XN(
this.indexes = indexes; lhz{1P]s
} k)= X}=w
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publicint getStartIndex(){ #!qm ZN
return startIndex; U;V7 u/{
} 4 \K7xM!
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publicvoid setStartIndex(int startIndex){ gsvuE
if(totalCount <= 0) q J=~Y|(
this.startIndex = 0; >#;.n(y
elseif(startIndex >= totalCount) 3n1;G8Nf
this.startIndex = indexes =J]]EoX/
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[indexes.length - 1]; .hP D$o
elseif(startIndex < 0) UcDS9f_87
this.startIndex = 0; t#/YN.@r
else{ *{@Nq=fE
this.startIndex = indexes RtP2]O(F
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[startIndex / pageSize]; Un(aW=PQ0
} B5VKs,g
} mpEK (p
!/*\}\'4
publicint getNextIndex(){ 88gM?G _X
int nextIndex = getStartIndex() + p8H'{f\G
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pageSize; i2U{GV<K-r
if(nextIndex >= totalCount) };bEU wGWf
return getStartIndex(); vq0Tk
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else qIE9$7*X
return nextIndex; [M}{G5U.
} 7Lc]HSZo,
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publicint getPreviousIndex(){ q&-`,8#
int previousIndex = getStartIndex() - W$;,CU.v
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pageSize; VT`^W Hu
if(previousIndex < 0) K.nHii
return0; sPQQ"|wU
else o.g V4%
return previousIndex; m@F`!qY~Y\
} "]x'PI 4J
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} D~iz+{Q4
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抽象业务类 l
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java代码: \gGW8Q;
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/** dNH08q8P
* Created on 2005-7-12 8)3*6+D
*/ o#gWbAG;]b
package com.javaeye.common.business; e@07
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import java.io.Serializable; uEP*iPLD@
import java.util.List; _pG-qK
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import org.hibernate.Criteria; (Q!}9K3
import org.hibernate.HibernateException; RnE4<Cy
import org.hibernate.Session; rJTa
import org.hibernate.criterion.DetachedCriteria; `r':by0M
import org.hibernate.criterion.Projections; /NFj(+&g+
import aCj&O:]=
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org.springframework.orm.hibernate3.HibernateCallback; X-Kh(Z
import IdYt\^@>
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org.springframework.orm.hibernate3.support.HibernateDaoS @ioJ]$o7
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upport; |F[+k e
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import com.javaeye.common.util.PaginationSupport; wv1iSfW
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public abstract class AbstractManager extends pa3{8x{9m
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HibernateDaoSupport { W,n!3:7s
@n /nH?L
privateboolean cacheQueries = false; 9:|{6_Y
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privateString queryCacheRegion; 1(R}tRR7 R
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publicvoid setCacheQueries(boolean Y\P8v
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cacheQueries){ 9;u@q%;!k
this.cacheQueries = cacheQueries; MJO-q $)c
} |SSSH
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publicvoid setQueryCacheRegion(String '<)n8{3Q5w
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queryCacheRegion){ 8/#A!Ww]
this.queryCacheRegion = Of#u
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queryCacheRegion; +3BN}
} Dml;#'IF3
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publicvoid save(finalObject entity){ VCkq"f7cw
getHibernateTemplate().save(entity); Bkc4TO
} ; DR$iH-F
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publicvoid persist(finalObject entity){ K5h
getHibernateTemplate().save(entity); c)85=T6*aA
} F/{!tx
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publicvoid update(finalObject entity){ 4pF*"B
getHibernateTemplate().update(entity); 1CZgb
} 9cF[seE"0
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publicvoid delete(finalObject entity){ q3!bky\
getHibernateTemplate().delete(entity); #trK^(
} S%>]q
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publicObject load(finalClass entity, j,eo2HaL
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finalSerializable id){ C,r;VyW6BI
return getHibernateTemplate().load Lk8ek}o'
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(entity, id); {!L~@r
} XpHrt XD
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publicObject get(finalClass entity, N4!O.POP
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finalSerializable id){ lL3U8}vn
return getHibernateTemplate().get 24eLB?H
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(entity, id); u6JM]kR
} 7?_CcRe
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publicList findAll(finalClass entity){ DTL.Bsc-.
return getHibernateTemplate().find("from h2R::/2.
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" + entity.getName()); q 2E_A
} wmLs/:~
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publicList findByNamedQuery(finalString B]tQ(s~
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namedQuery){ )SGq[B6@I
return getHibernateTemplate hwv/AnX~O
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().findByNamedQuery(namedQuery); a:w#s}bL
} (GfZ*
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publicList findByNamedQuery(finalString query, Dlvz)
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finalObject parameter){ \9T7A&
return getHibernateTemplate [7y]n;Fy
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().findByNamedQuery(query, parameter); J|7 3.&B
} cr;da)
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publicList findByNamedQuery(finalString query, "w<#^d_6
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finalObject[] parameters){ !4+<<(B=E
return getHibernateTemplate m8[j #=h
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().findByNamedQuery(query, parameters); ~k5W@`"W
} Mi_$">1-W
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publicList find(finalString query){ J{G?-+`
return getHibernateTemplate().find F#E3q|Q"BS
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(query); I>$&-i
} 8z\xrY
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publicList find(finalString query, finalObject r3?o9D>
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parameter){ R4d=S4i
return getHibernateTemplate().find Z;"vW!%d
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(query, parameter); 9>#6*/Oa7
} [Ch.cE_
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public PaginationSupport findPageByCriteria F:DrX_O%
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(final DetachedCriteria detachedCriteria){ 7{Wny&[0
return findPageByCriteria wy2
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); e+K^Aq
} ?Mfw]z"\C)
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public PaginationSupport findPageByCriteria ,2ar7
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(final DetachedCriteria detachedCriteria, finalint Ek}A]zC
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startIndex){ TL#3;l^
return findPageByCriteria NGW xN8P6
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(detachedCriteria, PaginationSupport.PAGESIZE, *8XEYZa
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startIndex); >LuYHr
} syK^<xa
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public PaginationSupport findPageByCriteria ehY5!D1Q
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(final DetachedCriteria detachedCriteria, finalint <54
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pageSize, PUX;I0Cf
finalint startIndex){ sx<%2
return(PaginationSupport) 1-QS~)+
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getHibernateTemplate().execute(new HibernateCallback(){ xkR0
publicObject doInHibernate OZ!^ak
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(Session session)throws HibernateException { {]|J5Dgfe
Criteria criteria = POR\e|hRT]
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detachedCriteria.getExecutableCriteria(session); 0qT%!ku&
int totalCount = &jr3B;g!C
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((Integer) criteria.setProjection(Projections.rowCount dC4'{n|7
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()).uniqueResult()).intValue(); kO-(~];
criteria.setProjection RCLeA=/N@0
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(null); 4ss4kp_>
List items = BL58] P84
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criteria.setFirstResult(startIndex).setMaxResults !5?<% *
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(pageSize).list(); 7j)8Djzp|
PaginationSupport ps = NW)1#]gg%
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new PaginationSupport(items, totalCount, pageSize, 7vj2
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startIndex); G 9vpt M
return ps; K 'I#W
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} G<;*SYAb
}, true); Nl(Foya%)
} k.15CA`
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public List findAllByCriteria(final d8x;~RA
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DetachedCriteria detachedCriteria){ w"&n?L
return(List) getHibernateTemplate k+l b@!
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().execute(new HibernateCallback(){ R_S.tT!
publicObject doInHibernate `x%>8/
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(Session session)throws HibernateException { <yg F(
Criteria criteria = dN[\xVcj
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detachedCriteria.getExecutableCriteria(session); U\!X,a*ts{
return criteria.list(); ^D-/`d
} j^2j&Ta
}, true); Tkgs]q79
} Hl
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public int getCountByCriteria(final 1D!<'`)AY
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DetachedCriteria detachedCriteria){ ^&Y#)II
Integer count = (Integer) l0i^uMS
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getHibernateTemplate().execute(new HibernateCallback(){ 4x[S\,20
publicObject doInHibernate K8Y=S12Ti
q?/a~a
(Session session)throws HibernateException { I?G: p+
Criteria criteria = CYYU7
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detachedCriteria.getExecutableCriteria(session); <dhM\^[
return As<bL:>dE
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criteria.setProjection(Projections.rowCount "AGLVp.zT
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()).uniqueResult(); ZbAcO/
} 'F#KM1s
}, true); lQkQ9##*
return count.intValue(); n^6j9FQ7
} iTU5l5U z
} WU=59gB+jL
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用户在web层构造查询条件detachedCriteria,和可选的 Pw!MS5=r
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 "vE4E|
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PaginationSupport的实例ps。 j^rIH#V
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ps.getItems()得到已分页好的结果集 HBx=\%;n
ps.getIndexes()得到分页索引的数组 `XEr(e9
ps.getTotalCount()得到总结果数 dT1H
ps.getStartIndex()当前分页索引 F;0}x;:>
ps.getNextIndex()下一页索引 OMg<V
ps.getPreviousIndex()上一页索引 ax5<#3__
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 m:o<X K[>
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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 :^3LvPM
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一下代码重构了。 pYZ6e_j1~
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我把原本我的做法也提供出来供大家讨论吧: G..aiA
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首先,为了实现分页查询,我封装了一个Page类: 5 -RsnF
java代码: o:P}Wg/NK
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/*Created on 2005-4-14*/ G`BU=Fi
package org.flyware.util.page; Y+u_IJ
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/** 0Bi.6r
* @author Joa s %\-E9
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* ^mO~W!"
*/ y^v6AM
publicclass Page { S<@7_I
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/** imply if the page has previous page */ Tl[!=S
privateboolean hasPrePage; "PTZ%7YH}
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/** imply if the page has next page */ w\i\Wp,FP
privateboolean hasNextPage; qjdMqoOCjl
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/** the number of every page */ ZE=Sp=@)j
privateint everyPage; 8hJ%JEzga
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/** the total page number */ 9s$CA4?HP
privateint totalPage; *<jAiB,O*
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/** the number of current page */ *><F'
privateint currentPage; "h a L
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/** the begin index of the records by the current SVs_dG$
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query */ ^2on.N q>
privateint beginIndex; EGzzHIZ`!
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/** The default constructor */ *4+"Lh.KS
public Page(){ vAh6+K.e
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} .C(eh
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/** construct the page by everyPage 4Thn])%I
* @param everyPage uU <=d
* */ Q$1bWUS&
public Page(int everyPage){ >eqxV|]i
this.everyPage = everyPage; aM2l2
} =`:K{loxq
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/** The whole constructor */ _w/EP
public Page(boolean hasPrePage, boolean hasNextPage, =2zJ3&9
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int everyPage, int totalPage, TYmP)
int currentPage, int beginIndex){ (\a]"g,]v
this.hasPrePage = hasPrePage; Z
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this.hasNextPage = hasNextPage; G_{&sa
this.everyPage = everyPage; wF,UE_
this.totalPage = totalPage; VsgE!/>1
this.currentPage = currentPage; !*m5F8Qm?A
this.beginIndex = beginIndex; )5%'.P>
} {QZUDPPR
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/** 0]=i}wL 8
* @return OK6]e3UO
* Returns the beginIndex. %Nhx;{
*/ ng:9 l3x
publicint getBeginIndex(){ RGg(%.
return beginIndex; .DR<Te
} H]p!\H
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/** Jd(,/q
* @param beginIndex C\nhqkn
* The beginIndex to set. a / #PLP
*/ ]*FVz$>XM
publicvoid setBeginIndex(int beginIndex){ SWQ5fcPu
this.beginIndex = beginIndex; bQP{|
} M^iU;vo
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/** rN<