Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 n\ma5"n0=\
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 dox QS ohS
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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 cJm!3X
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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 H#G~b""mY
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分页支持类: /wCee G,<
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java代码: JPiC/
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package com.javaeye.common.util; Uz H)fB
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import java.util.List; 5\f*xY
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publicclass PaginationSupport { /Yx 1S'5
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publicfinalstaticint PAGESIZE = 30; eF}Q8]da
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privateint pageSize = PAGESIZE; (J<@e!@NE
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privateList items; S_6`.@B}
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privateint totalCount; 2X)E3V/*
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privateint[] indexes = newint[0]; J(M0t~RZ
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privateint startIndex = 0; xvjHGgWSxc
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public PaginationSupport(List items, int "a`0s_F,^
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totalCount){ ?GD{}f33
setPageSize(PAGESIZE); cPI #XPM=
setTotalCount(totalCount); m3 (fr
setItems(items); Nf0b?jn-
setStartIndex(0); $|6Le;
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} tJ.LPgfZ
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public PaginationSupport(List items, int p4Vw`i+DnH
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totalCount, int startIndex){ 7x-k-F3
setPageSize(PAGESIZE); J%f5NSSU{6
setTotalCount(totalCount); w69`vK
setItems(items); >eAlz4
setStartIndex(startIndex); ]v94U b
} V[+ Pb]
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public PaginationSupport(List items, int na
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totalCount, int pageSize, int startIndex){ w:'$Uf8]
setPageSize(pageSize); 4p>@UB&U
setTotalCount(totalCount); yql+N[
setItems(items); ;5" r)F+P
setStartIndex(startIndex); pVt-7AgW
} bU2)pD!N
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publicList getItems(){ e
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return items; r]BB$^@@V
} }Ss#0Gee
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publicvoid setItems(List items){ u33+ ikYv
this.items = items; nsw.\(#
} RXl52#:
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publicint getPageSize(){ A{9Hm:)
return pageSize; go2:D#mf
} a/_sL(F{
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publicvoid setPageSize(int pageSize){ >?U(w<
this.pageSize = pageSize; <diI*H<G
} _jU6[y|XLh
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publicint getTotalCount(){ )u\"xxcV
return totalCount; Ik;~u8j1e
} rm3~]
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publicvoid setTotalCount(int totalCount){ 8C4Tyms
if(totalCount > 0){ 8"8sI
this.totalCount = totalCount; *1; <xeVD
int count = totalCount / u"pn'H
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pageSize; 1vl~[
if(totalCount % pageSize > 0) vx!nC}f"k`
count++; 1mI)xDi9
indexes = newint[count]; l4R:_Z<
for(int i = 0; i < count; i++){ I \vu?$w
indexes = pageSize * #ye++.7WK
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} /wCP(1Mw
}else{ ;K$E;ZhPN
this.totalCount = 0; 1|z>}
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} C+y:<oo)
} %@H;6
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publicint[] getIndexes(){ O%0G37h
return indexes; rf)\:75
} !^l<jrM
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publicvoid setIndexes(int[] indexes){ |!57Z4X
this.indexes = indexes; l Fzb$k}_{
} J]N-^ld\\
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publicint getStartIndex(){ ~73YOGiGJH
return startIndex; K +w3YA
} H~||]_q|
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publicvoid setStartIndex(int startIndex){ m:p1O3[R
if(totalCount <= 0) ]d% hU
this.startIndex = 0; #[I`VA\x
elseif(startIndex >= totalCount) lXv{+ic
this.startIndex = indexes 6"jq/Pu
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[indexes.length - 1];
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elseif(startIndex < 0) :j?Lil%R
this.startIndex = 0; "hs`Y4U
else{ 9O@eJ$
this.startIndex = indexes sEhdkN}6
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[startIndex / pageSize]; =$b^X?x
} u^iK?S#Ci8
} 5;dnxhf
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publicint getNextIndex(){ 4V<s"
int nextIndex = getStartIndex() + a#j0N5<Nl
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pageSize; EkjO4=~UC
if(nextIndex >= totalCount) qjUQ2d
return getStartIndex(); _E&*JX
else nJ'O(Wh,)
return nextIndex; Q> @0'y=s
} 7M^!t X
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publicint getPreviousIndex(){ ;'R{b$B;|
int previousIndex = getStartIndex() - ^U:pv0Qz
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pageSize; R2t5T-8`c
if(previousIndex < 0) `){*JPl
return0; !:rQ@PSy9
else .xCO_7Rd
return previousIndex; AP/5,M<
} KQQR"[z&V
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} >RF[0s'-
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抽象业务类 <E$5LP;:
java代码: >9Ub=tZm
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/** ZqS'xN:k
* Created on 2005-7-12 ?sp
*/ ihf5`mk/$
package com.javaeye.common.business; 6D3fkvcZ
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import java.io.Serializable; gWgYZX
import java.util.List; m3P%E8<Q#
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import org.hibernate.Criteria; eP[azC"G[
import org.hibernate.HibernateException; Aw9^}k}UfD
import org.hibernate.Session; C37KvLQ
import org.hibernate.criterion.DetachedCriteria; j4+hWalm
import org.hibernate.criterion.Projections; Fgt/A#`fz
import Bb8lklQ
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org.springframework.orm.hibernate3.HibernateCallback; O' A''}M
import { S4?L8
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org.springframework.orm.hibernate3.support.HibernateDaoS &Q(Q/]U~
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upport; HrEZ]iQ@O0
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import com.javaeye.common.util.PaginationSupport; D3(|bSca
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public abstract class AbstractManager extends Gvl-q1PVC
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HibernateDaoSupport { mY#[D;mUe
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privateboolean cacheQueries = false; ^nFa'=
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privateString queryCacheRegion; p\b:uy6#
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publicvoid setCacheQueries(boolean o^d(mJZ.F~
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cacheQueries){ X.%Xi'H
this.cacheQueries = cacheQueries; <y(>z*T;
} >bEH&7+@_'
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publicvoid setQueryCacheRegion(String M+
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queryCacheRegion){ +:mj]`=
this.queryCacheRegion = fPZBm&`C
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queryCacheRegion; u}qfwVX Z
} Z\6azhbI}
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publicvoid save(finalObject entity){ ~EpMO]I
getHibernateTemplate().save(entity); ?dC[VYC\^
} ? R;5ErZ
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publicvoid persist(finalObject entity){ ]J5[ZVz
getHibernateTemplate().save(entity); Ep.,2H
} Apa)qRJd
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publicvoid update(finalObject entity){ D0~ WK
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getHibernateTemplate().update(entity); +2|X 7wA
} Pb+oV
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publicvoid delete(finalObject entity){ Y%anR|
getHibernateTemplate().delete(entity); *{)[:;
} Q^b_+M
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publicObject load(finalClass entity, DTlM}
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finalSerializable id){ MDGcK/$')f
return getHibernateTemplate().load 0$":W
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(entity, id); ` {k>I^Pg
} F2AM/m^!q
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publicObject get(finalClass entity, 9K Ih}Q@P
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finalSerializable id){ jf$6{zO6j
return getHibernateTemplate().get V4l`Alr\L
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(entity, id); Zo-E0[9
} i>7f9D7
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publicList findAll(finalClass entity){ q4xB`G
return getHibernateTemplate().find("from >XSe[K
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" + entity.getName()); #fk)Y1
} wI1[I
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publicList findByNamedQuery(finalString h<Yn0(.
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namedQuery){ F$ZWQ9&5U0
return getHibernateTemplate --Dw
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().findByNamedQuery(namedQuery); ?"{+m
} X']>b
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publicList findByNamedQuery(finalString query, 6mep|![6
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finalObject parameter){ Q= + Frsk
return getHibernateTemplate CbQ@l@d]
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().findByNamedQuery(query, parameter); cEsBKaN
} U`W^w%
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publicList findByNamedQuery(finalString query, ~BERs;4
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finalObject[] parameters){ jm.pb/
return getHibernateTemplate ,h#!!j\j6
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().findByNamedQuery(query, parameters); _8 vxb
} ]N!SG@X+
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publicList find(finalString query){ Y@9L8XNP>
return getHibernateTemplate().find R>/M>*C
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(query); c*RZbE9k
} Q,#M
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publicList find(finalString query, finalObject l]sO[`X
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parameter){ >z>UtT:
return getHibernateTemplate().find wS``Q8K+dM
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(query, parameter); )tFFa*Z'
} *9j9=N?
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public PaginationSupport findPageByCriteria g?`D8
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(final DetachedCriteria detachedCriteria){ 1Y}gki^F
return findPageByCriteria RVI],O
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ?z:xQ*#X
} ^z[s;:-
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public PaginationSupport findPageByCriteria Cf`UMQ a
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(final DetachedCriteria detachedCriteria, finalint
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startIndex){ !~ -^s
return findPageByCriteria $ZcmE<7k
X){F^1CT{
(detachedCriteria, PaginationSupport.PAGESIZE, Y] P}7GZ
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startIndex); AQQj]7Y
} oC4rL\d{
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public PaginationSupport findPageByCriteria ,P auP~L
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(final DetachedCriteria detachedCriteria, finalint zh/+1
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pageSize, l\$C)q6O
finalint startIndex){ &v 5yo}s
return(PaginationSupport) >$R-:>~zN
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getHibernateTemplate().execute(new HibernateCallback(){ ^+GN8LUs
publicObject doInHibernate zR{TWk]
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(Session session)throws HibernateException { 4a!L/m*
Criteria criteria = QQ!,W':
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detachedCriteria.getExecutableCriteria(session); Z<&:
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int totalCount = e;!<3b
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((Integer) criteria.setProjection(Projections.rowCount X='4N<
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()).uniqueResult()).intValue(); OcSLRN?t
criteria.setProjection "4"L"lJ
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(null); UI8M<
List items = 6b]vHT|p
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criteria.setFirstResult(startIndex).setMaxResults c!841~p(Q
`q
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(pageSize).list(); 4e%SF|(Y'h
PaginationSupport ps = C}00S{nAZ
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new PaginationSupport(items, totalCount, pageSize, Eydk645:3
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startIndex); ;c;;cJc!
return ps; P,>#
} Y:byb68
}, true); q g%<>B&"
} Sk1yend4
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public List findAllByCriteria(final 3b[_0
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DetachedCriteria detachedCriteria){ = j}00,WH
return(List) getHibernateTemplate W5yqnjK
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().execute(new HibernateCallback(){ Ybok[5
publicObject doInHibernate HZP`u >.
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(Session session)throws HibernateException { :_?>3c}L
Criteria criteria = =nY*,Xu<
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detachedCriteria.getExecutableCriteria(session); /sYD+*a
return criteria.list(); U|y+k`
} F5*Xx g}N
}, true); "1l d4/
} f-23.]`v
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public int getCountByCriteria(final "0]i4d1l
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DetachedCriteria detachedCriteria){ *.i`hfRc
Integer count = (Integer) C"YM"9JSJ
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getHibernateTemplate().execute(new HibernateCallback(){ ?5+=
publicObject doInHibernate M/#<=XhA
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(Session session)throws HibernateException { W/&cnp\
Criteria criteria = D+k5e=
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detachedCriteria.getExecutableCriteria(session); 8-po|
return N]5-#
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criteria.setProjection(Projections.rowCount & }}o9
}b~ZpUL!
()).uniqueResult(); M#2DI?S@
} ,!Q2^R
}, true); j4Lf6aUOX
return count.intValue(); W**a\[~$
} >0u4>=#
} Qs*g)Yr
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用户在web层构造查询条件detachedCriteria,和可选的 bl:.D~@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 H{9di\xnEm
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PaginationSupport的实例ps。 LL.YkYu
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ps.getItems()得到已分页好的结果集 7X1T9'jI2
ps.getIndexes()得到分页索引的数组 HP&+ 8
ps.getTotalCount()得到总结果数 -Vw,9VCF
ps.getStartIndex()当前分页索引 s8eFEi
ps.getNextIndex()下一页索引 ] S]F&B
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ps.getPreviousIndex()上一页索引 n|3ENN
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 a\aJw[d{
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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 KK}^E_v
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一下代码重构了。 hH|3s-o
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我把原本我的做法也提供出来供大家讨论吧: 6:#zlKYJ
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首先,为了实现分页查询,我封装了一个Page类: F3i+t+Jt
java代码: gI<TfcC
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/*Created on 2005-4-14*/ (n|PLi
package org.flyware.util.page; |fOQm
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/** pMKnA.|
* @author Joa 5ZSV)$t
* AK} wSXF
*/ kR3g,P{L
publicclass Page { V^As@P8,'(
8lg$]
/** imply if the page has previous page */ v&;q4b4
privateboolean hasPrePage; /Z94<}C6b
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}
/** imply if the page has next page */ #ih(I7prH
privateboolean hasNextPage; 2I*
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/** the number of every page */ d dkh*[
privateint everyPage; "k o?AUt
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/** the total page number */ ryg1o=1v/
privateint totalPage; PV<=wc^
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/** the number of current page */ \!Cix}}1
privateint currentPage; BxS\"W
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/** the begin index of the records by the current dgh)Rfp3
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query */ n,q+EZd
privateint beginIndex; e
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/** The default constructor */ $!)Sgb
public Page(){ }RowAGWL
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} 9~2}hXm;
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/** construct the page by everyPage =ZR9zL=h
* @param everyPage >~8;H x].d
* */ sEP-jEuwG
public Page(int everyPage){ EnnT)qos
this.everyPage = everyPage; kclClB:PS
} l=,\ h&
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/** The whole constructor */ YNyaz\L
public Page(boolean hasPrePage, boolean hasNextPage, Fa:fBs{
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int everyPage, int totalPage, FKRO0%M4}Z
int currentPage, int beginIndex){ G5a PjP
this.hasPrePage = hasPrePage; a+sHW<QeS
this.hasNextPage = hasNextPage; \n$s5i-
this.everyPage = everyPage; bL
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this.totalPage = totalPage; pESlBQ7{I
this.currentPage = currentPage; &.J8O+
this.beginIndex = beginIndex; {G$I|<MD2T
} ,WSK
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/** Z^5j.d{e$
* @return q_S`@2Dzz,
* Returns the beginIndex. "h?;)Ye
*/ #2l6'gWE0
publicint getBeginIndex(){ \i_y(;
return beginIndex; A`_(L|~
} NsDJq{
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/** 65X31vU
* @param beginIndex oE@{h$=
* The beginIndex to set. t9T3e
*/ 7yp7`|,p
publicvoid setBeginIndex(int beginIndex){ ]4~-
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this.beginIndex = beginIndex; ."b=dkx
} &* GwA
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/** O0OBkIj
* @return *:
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