Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 JT-Zo OZ
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 =UP)b9*h
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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 -T(V6&'Qi
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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 CUd'*Ewu
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分页支持类: \^:f4ZT
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java代码: 0\o'd\
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package com.javaeye.common.util; Mt:(w;Y
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import java.util.List; jHZ<Gc
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publicclass PaginationSupport { X[[=YCi0
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publicfinalstaticint PAGESIZE = 30; }bTMeCgI
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privateint pageSize = PAGESIZE; Mf63 59
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privateList items; YD%Kd&es
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privateint totalCount; ;vx9xs?6
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privateint[] indexes = newint[0]; tpD?-`9o
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privateint startIndex = 0; -d~'tti
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public PaginationSupport(List items, int z,EOyi
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totalCount){ Kna'5L5"
setPageSize(PAGESIZE); z=U!D `]v
setTotalCount(totalCount); ^s*} 0
setItems(items); hd B[H8Q
setStartIndex(0); 2P}RZvUd
} S7vE[VF5
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public PaginationSupport(List items, int yiq#p"Hs
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totalCount, int startIndex){ +9J>'oe'D
setPageSize(PAGESIZE); 2vC=.1k
setTotalCount(totalCount); *Y ZLQT
setItems(items); DPOPRi~
setStartIndex(startIndex); v=>Gvl3&U
} -Me\nu8(RF
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public PaginationSupport(List items, int oX~CTunP
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totalCount, int pageSize, int startIndex){ "q.uiz+1:
setPageSize(pageSize); ^d*>P|n*@e
setTotalCount(totalCount); hz%IxI9
setItems(items); 8E+l;2
setStartIndex(startIndex); Tjqn::~D
} 2LU'C,o?
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publicList getItems(){ i`$rzXcS
return items; O@rb4(
} gOM`I+CwT
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publicvoid setItems(List items){ @UJmbD{
this.items = items; [\1l4C
} }nl)*l
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publicint getPageSize(){ : 4WbDeR
return pageSize; k Dt)S$N4n
} DG=Ap:sl*$
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publicvoid setPageSize(int pageSize){ Pa +BE[z
this.pageSize = pageSize; @`D6F;R
} z%tu6_4j
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publicint getTotalCount(){ [@Y q^.6t
return totalCount; [!mjUsut*
} I:<R@V<~#
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publicvoid setTotalCount(int totalCount){ 9K<a}QJP
if(totalCount > 0){ w>_EM&r6~u
this.totalCount = totalCount; |$2N$6\SP
int count = totalCount / w.p'Dpw
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pageSize; +=Wdn)T
if(totalCount % pageSize > 0) u$8MVP
count++; GTl (i*
indexes = newint[count]; ,&]`
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for(int i = 0; i < count; i++){ J94YMyOo
indexes = pageSize * /8\&f%E
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} 1o 78e2B
}else{ Y26l,XIV
this.totalCount = 0; [_b='/8
} Eo&qc 17)`
} a&Du5(r;!
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publicint[] getIndexes(){ *%'7~58ObS
return indexes; '<S:|$$
} 9mphj)`d;#
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publicvoid setIndexes(int[] indexes){ Z3>3&|&
this.indexes = indexes; ~j#6 goKn
} E=lfg8yb:
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publicint getStartIndex(){ luk2fi<$
return startIndex; eAKQR
} @k6}4O?{
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publicvoid setStartIndex(int startIndex){ $'{`i5XB
if(totalCount <= 0) <D;Q8
this.startIndex = 0; t0d '>
elseif(startIndex >= totalCount) -G#@BtB2+
this.startIndex = indexes LE80`t>M#
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[indexes.length - 1]; ikG9l&n
elseif(startIndex < 0) qZ_fQ@
this.startIndex = 0; ?mfWm{QTt
else{ rRrW
this.startIndex = indexes C|IQM4
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[startIndex / pageSize]; f<4q ]HCa
} s1 ^mk]
} G^@Jgx3n
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publicint getNextIndex(){ }rA+W-7
int nextIndex = getStartIndex() + Q[Sd
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pageSize; xc<eU`-'b
if(nextIndex >= totalCount) 2n;;Tso"
return getStartIndex(); :Z]hI+7
else uQtk|)T E
return nextIndex; r,@X>_}
} E(3+o\w
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publicint getPreviousIndex(){ w$[Ds
int previousIndex = getStartIndex() - 4OZ5hH
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pageSize; #JR ,C
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if(previousIndex < 0) d7tD|[(J
return0; Q @OC =
else !0csNg!
return previousIndex; 5v>{Z0TE[6
} Re,$<9V
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} <AAZ8#^
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抽象业务类 <,4R2'
java代码: 'UvS3]bSYW
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/** !ga(L3vf
* Created on 2005-7-12 H, XLb.
*/ bu"68A;>
package com.javaeye.common.business; Y0u'@l_[F
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import java.io.Serializable; FH`'1iVH
import java.util.List; o&XMgY~
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import org.hibernate.Criteria; Vyt~OTI\
import org.hibernate.HibernateException; Msa6yD#
import org.hibernate.Session; SC
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import org.hibernate.criterion.DetachedCriteria; X#kjt)W
import org.hibernate.criterion.Projections; N{hF [F
import )_c=mT
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org.springframework.orm.hibernate3.HibernateCallback; Ub'%pU
import 5e/qgI)M5
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org.springframework.orm.hibernate3.support.HibernateDaoS H?`)[#
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upport; # +QWi0B
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import com.javaeye.common.util.PaginationSupport; C7jc 6(>m
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public abstract class AbstractManager extends Z4HA94
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HibernateDaoSupport { "Ql}Y1
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privateboolean cacheQueries = false; KYkS6|A
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privateString queryCacheRegion; W) 33;E/}
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publicvoid setCacheQueries(boolean 4j=<p@
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cacheQueries){ Wiq{wxe
this.cacheQueries = cacheQueries; s,$Z("B
} YH'$_,8peM
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publicvoid setQueryCacheRegion(String t":W.q<
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queryCacheRegion){ SY$J+YBLM
this.queryCacheRegion = Z@uTkqG)
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queryCacheRegion; u(1J=h
} H:q )^$s
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publicvoid save(finalObject entity){ FpdDIa
getHibernateTemplate().save(entity); e$Xq
} "w*+v
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publicvoid persist(finalObject entity){ 1jH7<%y
getHibernateTemplate().save(entity); T|o`a+?
} \);.0
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publicvoid update(finalObject entity){ 2SDh0F
getHibernateTemplate().update(entity); 6o=qJ`m[?
} ET,Q3X\Oe
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publicvoid delete(finalObject entity){ ^w:OS5 %R
getHibernateTemplate().delete(entity); LbJtpwz>z
} U,Z"G1^
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publicObject load(finalClass entity, dSOlD/c
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finalSerializable id){ M11"<3]D
return getHibernateTemplate().load \4h>2y
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(entity, id); tmO;:n<N
} eecw]P_?
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publicObject get(finalClass entity, }Vvsh3
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finalSerializable id){ ! jbEm8bt
return getHibernateTemplate().get )n\*ht7
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(entity, id); :8p&#M
} v~^ks{
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publicList findAll(finalClass entity){ 79)A%@YHQQ
return getHibernateTemplate().find("from x}tKewdOSe
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" + entity.getName()); Dn~Z SrJ
} >f&xJq
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publicList findByNamedQuery(finalString j((hqJr
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namedQuery){ MV%Xhfk
return getHibernateTemplate PC*m%
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().findByNamedQuery(namedQuery); pG/
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} \% }raI;Y@
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publicList findByNamedQuery(finalString query, 2
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finalObject parameter){ Tdg6kkJ
return getHibernateTemplate (~S<EUc$
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().findByNamedQuery(query, parameter); 2=>*O
} @4;&hP2Z:
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publicList findByNamedQuery(finalString query, cL#-*_(
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finalObject[] parameters){ :]'q#$!
return getHibernateTemplate P3G:th@j=
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().findByNamedQuery(query, parameters); yL.^ =
} MFv
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publicList find(finalString query){ hHpx?9O+!
return getHibernateTemplate().find &`\ ep9
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(query); (#oYyM]
} >;,gGH
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publicList find(finalString query, finalObject iAK/d)bq
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parameter){ m=H_?W;
return getHibernateTemplate().find yr5NRs
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(query, parameter); *%X.ym'
} TFO74^
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public PaginationSupport findPageByCriteria !nwbj21%
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(final DetachedCriteria detachedCriteria){ L;3aZt,#O
return findPageByCriteria *6XRjq^#
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); I] jX7.fx
} 8)pB_en3sO
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public PaginationSupport findPageByCriteria /_q#ah
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(final DetachedCriteria detachedCriteria, finalint G]-%AO{K
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startIndex){ eES'}[W>
return findPageByCriteria
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(detachedCriteria, PaginationSupport.PAGESIZE, 1aq2aLx
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startIndex); @V$I?iXV
} G?<pBMy
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public PaginationSupport findPageByCriteria 9:-T@u
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(final DetachedCriteria detachedCriteria, finalint ,Aj }]h\L
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pageSize, E_3r[1l
finalint startIndex){ gLD{1-v
return(PaginationSupport) ^X&)'H
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getHibernateTemplate().execute(new HibernateCallback(){ [/OQyb4F<
publicObject doInHibernate \i0-o8q@I
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(Session session)throws HibernateException { b@6:1x
Criteria criteria = = /Wu'gG)
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detachedCriteria.getExecutableCriteria(session); .!yq@Q|=u
int totalCount = 6R2uWv
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((Integer) criteria.setProjection(Projections.rowCount %K zbO0
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()).uniqueResult()).intValue(); BFh$.+D
criteria.setProjection X`1p'JD
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(null); fK_~lGY(
List items = bMmra.x4L
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criteria.setFirstResult(startIndex).setMaxResults dE [Ol
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(pageSize).list(); ltSh'w0
PaginationSupport ps = TatMf;?h&
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new PaginationSupport(items, totalCount, pageSize, 7`fY*O6
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startIndex); N09KVz2Q
return ps; g$w6kz_[
} nU17L6'$
}, true); t',BI
} )6{P8k4Zr
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public List findAllByCriteria(final gxmc|
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DetachedCriteria detachedCriteria){ Qh-4vy=r
return(List) getHibernateTemplate #
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().execute(new HibernateCallback(){ s$GF 95^
publicObject doInHibernate DYRE1!
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(Session session)throws HibernateException { _Adsq8sFW
Criteria criteria = G{o+R]Us
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detachedCriteria.getExecutableCriteria(session); |$e:*
return criteria.list(); Ttv'k*$cP
} C9jbv/c
}, true); 9":2"<'+
} V]c5
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public int getCountByCriteria(final LgHJo-+>
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DetachedCriteria detachedCriteria){ V;93).-$
Integer count = (Integer) tcA;#^jc
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getHibernateTemplate().execute(new HibernateCallback(){ JJ5C}`(
publicObject doInHibernate 2-v\3voN
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(Session session)throws HibernateException { C3S`}o.
Criteria criteria = kG^dqqn6
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detachedCriteria.getExecutableCriteria(session); oT3Y!Y3=<
return xR908+>5
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criteria.setProjection(Projections.rowCount z+3 9ee
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()).uniqueResult(); A*'V+(
} U)[ty@zyF
}, true); j} RzXJ~t
return count.intValue(); Zq*eX\#C
} FT/amCRyT
} aws"3O%
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用户在web层构造查询条件detachedCriteria,和可选的 Jps .;yjk
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ~HDdO3
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PaginationSupport的实例ps。 cwynd=^nC
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ps.getItems()得到已分页好的结果集 j>'B[
ps.getIndexes()得到分页索引的数组 S()Za@ [a$
ps.getTotalCount()得到总结果数 ($WE=biZ&
ps.getStartIndex()当前分页索引
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ps.getNextIndex()下一页索引 \0AiCMX[
ps.getPreviousIndex()上一页索引 F~_;o+e;X
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 9?`RR/w
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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 .>]N+:O
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一下代码重构了。 slvq9,
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我把原本我的做法也提供出来供大家讨论吧: JJf<*j^G
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首先,为了实现分页查询,我封装了一个Page类: $a.u05
java代码: -M61Mw1
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/*Created on 2005-4-14*/ (pYYkR"
package org.flyware.util.page; t26ij`V
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/** CLK^ gZ
* @author Joa B\_[R'Pf&
* >XE`h9
*/ aWaw&u
publicclass Page { aRwnRii
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/** imply if the page has previous page */ h>3H7n.
privateboolean hasPrePage; KQ)T(mIqp
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/** imply if the page has next page */ gdi`x|0
privateboolean hasNextPage; s4,(26y
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/** the number of every page */ -p8e
privateint everyPage; 0IzZKRw
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/** the total page number */ ,")F[%v
privateint totalPage; 6k9Lx C:M
mk= #\>
/** the number of current page */ GS%b=kc
privateint currentPage; =_QkH!vI
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/** the begin index of the records by the current ~B_ D@gV|
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query */ 4v qNule
privateint beginIndex; -P#nT 2
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/** The default constructor */ 8"M<{72U]
public Page(){ D# v?gPo4
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} 4VFc|g
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/** construct the page by everyPage }1>atgq]w
* @param everyPage \_ -DyD#3
* */ hTw}X.<4
public Page(int everyPage){ o!Fl]3F
this.everyPage = everyPage; 0w3b~RJ
} u(hC^T1
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/** The whole constructor */ d@>\E/zA
public Page(boolean hasPrePage, boolean hasNextPage, lzfDH=&
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int everyPage, int totalPage, z%};X$V`J
int currentPage, int beginIndex){ F5IZ"Itu(
this.hasPrePage = hasPrePage; Wk[)+\WQ?
this.hasNextPage = hasNextPage; !$r9C/k
this.everyPage = everyPage; F+*Q <a4
this.totalPage = totalPage; C*G/_`?9
this.currentPage = currentPage; +/q0Y`v
this.beginIndex = beginIndex; Z| L2oce
} /f&By
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/** }ecsGw
* @return t/ eo]
* Returns the beginIndex. gj;@?o0
*/ \7
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publicint getBeginIndex(){ ':sTd^V
return beginIndex; owMmCR
} d*%Mv[X:<