Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 SA=>9L,2
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 xh9$ZavB*
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 V?wV*]c
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 Av5:/c.B
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分页支持类: Hk h'h"_r
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java代码: yrfV&C%=n
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package com.javaeye.common.util; 8 p[n>qV9
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import java.util.List; h"0)spF"d
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publicclass PaginationSupport { >X05f#c"v/
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publicfinalstaticint PAGESIZE = 30; fPPP|
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privateint pageSize = PAGESIZE; -,p=;t#(
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privateList items; \I523$a
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privateint totalCount; 23>[-XZb[O
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privateint[] indexes = newint[0]; sTlel&
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privateint startIndex = 0; y5m2u8+
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public PaginationSupport(List items, int 1H/I-
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totalCount){ V<H9KA
setPageSize(PAGESIZE); 31G0B_T
setTotalCount(totalCount); .)!QsBU
setItems(items); %sr- xE
setStartIndex(0); wAprksZL#
} &EQhk9j
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public PaginationSupport(List items, int !!^z6jpvn
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totalCount, int startIndex){ ^1bslCe
setPageSize(PAGESIZE); Q]xkDr?
setTotalCount(totalCount); tZ9i/ =S
setItems(items); FHSoj=
setStartIndex(startIndex); [c
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} JL= c IH8
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public PaginationSupport(List items, int =L" 0]4K
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totalCount, int pageSize, int startIndex){ P6 OnE18n
setPageSize(pageSize); :BF ? r
setTotalCount(totalCount); }bjZeh.
setItems(items); YNU}R/u6^
setStartIndex(startIndex); NFs 5XpZ~
} p%"dYH%]&0
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publicList getItems(){ GrL{q;IO
return items; ;[sW\Ou
} @dDeOnF
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publicvoid setItems(List items){ ~t`s&t'c|
this.items = items; 5G*cAlU
} #dA$k+3
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publicint getPageSize(){ L8QWEFB|
return pageSize; \c}(rqT
} yp.K-
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publicvoid setPageSize(int pageSize){ QOF@DvQ
this.pageSize = pageSize; +$,Re.WnP
} \2i7\U
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publicint getTotalCount(){ L_8zZ8 o
return totalCount; hArY$T&MB
} o%$.8)B9F
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publicvoid setTotalCount(int totalCount){ %z><)7
if(totalCount > 0){ W lMcEje
this.totalCount = totalCount; kXMp()N8`
int count = totalCount / }rTH<!j
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pageSize; Kx__&a
if(totalCount % pageSize > 0) ff"wg\O4
count++; |\5^ub,m
indexes = newint[count]; "F<CGSo
for(int i = 0; i < count; i++){ yB*,)x0
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indexes = pageSize * )O]T}eI
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} +eM${JyXH
}else{ ~4S$+*'8
this.totalCount = 0; b'H'QY
} J3K=z
} \oQ]=dDCd%
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publicint[] getIndexes(){ R?2sbK4Cz
return indexes; y7R#PkQ~
} lq/2Y4LE)
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publicvoid setIndexes(int[] indexes){ {|+Y;V`
this.indexes = indexes; Lpchla$
} ^[L(kHOGzk
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publicint getStartIndex(){ )s2] -n}W
return startIndex; =P-&dN
} j=_rUc'Me
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publicvoid setStartIndex(int startIndex){ )&DAbB!O
if(totalCount <= 0) 4JSPD#%f
this.startIndex = 0; 5sD,gZ7
elseif(startIndex >= totalCount) ]|;+2@kDR
this.startIndex = indexes )M*w\'M
# kI>
[indexes.length - 1]; B*7kX&Uq
elseif(startIndex < 0) .b:!qUE^
this.startIndex = 0; r );R/)&
else{ ZSMed(//b
this.startIndex = indexes e5h*GKF
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[startIndex / pageSize]; Ycm)PU ["
} ]n ?x tI
} HDyf]2N*N
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publicint getNextIndex(){ qZoDeN-CC
int nextIndex = getStartIndex() + 0QQss
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pageSize; $o6/dEKQ
if(nextIndex >= totalCount) D{|q P
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return getStartIndex(); <QtZ6-;_f
else |J`EM7qMK
return nextIndex; ^-;S&=
} }ze+ tf
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publicint getPreviousIndex(){ Pms@!yce
int previousIndex = getStartIndex() - `s}*
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pageSize; ~ KK9aV{
if(previousIndex < 0) pA7-B>Y
return0; U~
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else }v1wpv/b(
return previousIndex; D6SUzI1+H
} _o' jy^
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} RTH dL
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抽象业务类 isQ{Xt~K
java代码: 0N_Ma')i
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/** 7:mM`0g!
* Created on 2005-7-12 W%Br%VQJ
*/ pc^(@eD
package com.javaeye.common.business; :pDw gd
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import java.io.Serializable; +3]@0VM26;
import java.util.List; 0-l
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import org.hibernate.Criteria; i. `S0
import org.hibernate.HibernateException; /LPSI^l!m
import org.hibernate.Session; @6h=O`X>
import org.hibernate.criterion.DetachedCriteria; CuT[V?^iD
import org.hibernate.criterion.Projections; L7q%u.nB1
import c 6E@+xU
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org.springframework.orm.hibernate3.HibernateCallback; ]*[S#Jk
import )h2wwq0]
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org.springframework.orm.hibernate3.support.HibernateDaoS Hd2Sou4-j
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upport; 5c3)p^]g
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import com.javaeye.common.util.PaginationSupport; @e$zEj5
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public abstract class AbstractManager extends %CD}A%~
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HibernateDaoSupport { J3S@1"
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privateboolean cacheQueries = false; 9_5Fl,u
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privateString queryCacheRegion; M:Xswwq
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publicvoid setCacheQueries(boolean ) i.p[
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cacheQueries){ EoIP#Cnd1
this.cacheQueries = cacheQueries; 0rsdDME[
} y9pQ1H<F;
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publicvoid setQueryCacheRegion(String &>*fJ
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queryCacheRegion){ W*}q;ub;
this.queryCacheRegion = j'X]bd'
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queryCacheRegion; B9>3xxp(by
} azS"*#r6}
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publicvoid save(finalObject entity){ 7K
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getHibernateTemplate().save(entity); _F;(#D
} >e>Q'g{
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publicvoid persist(finalObject entity){ CJ
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getHibernateTemplate().save(entity); UF|v=|*{#
} CLdLO u"
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publicvoid update(finalObject entity){ &t+03c8g!
getHibernateTemplate().update(entity); * G.6\
} neoT\HV
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publicvoid delete(finalObject entity){ k8GcHqNHx
getHibernateTemplate().delete(entity); j_o6+Rk
} T,TKt%
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publicObject load(finalClass entity, o/CSIvz1
@Vr?)_0
finalSerializable id){ 6HCP1`gg
return getHibernateTemplate().load A%"mySW
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(entity, id); 0"ZB|^c=
} sc@v\J;k
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publicObject get(finalClass entity, ujXC#r&
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finalSerializable id){ 3R
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return getHibernateTemplate().get c#<v:b
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(entity, id); #c5G"^)z
} LrX7WI
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publicList findAll(finalClass entity){ $Dxz21|P7
return getHibernateTemplate().find("from +w?RW^:Q=
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" + entity.getName()); nBgksB*A
} Dr^#e
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publicList findByNamedQuery(finalString a-MDZT<xA+
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namedQuery){ u%Bk"noCa
return getHibernateTemplate z:u e]7(.
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().findByNamedQuery(namedQuery); lM3UjR|@
} uCB7(<
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publicList findByNamedQuery(finalString query, v/
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finalObject parameter){ ArDkJ`DE
return getHibernateTemplate th}Q`vg0
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().findByNamedQuery(query, parameter); g)u
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} x{`>Il
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publicList findByNamedQuery(finalString query, HFu#-}iNV
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finalObject[] parameters){ M.O3QKU4
return getHibernateTemplate +Em+W#i%?
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().findByNamedQuery(query, parameters); 9!6sf
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} :8cp]vdW
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publicList find(finalString query){ ZT:&j4A|0
return getHibernateTemplate().find {s&6C-
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(query); DUUQz:?{J
} -\O%f)R
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publicList find(finalString query, finalObject |Byw]\3v
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parameter){ pT\>kqmj
return getHibernateTemplate().find V+j58Wuf
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(query, parameter); W9nmTz\8
} CBz$N) f
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public PaginationSupport findPageByCriteria >|Ps23J#
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(final DetachedCriteria detachedCriteria){ rvrv[^a(
return findPageByCriteria r!A1Sfo4P
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); f'._{"
} !lf'gW
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public PaginationSupport findPageByCriteria <d!_.f}v
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(final DetachedCriteria detachedCriteria, finalint d/oxRzk'L
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startIndex){ }Fy~DsQ
return findPageByCriteria t:|knZq
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(detachedCriteria, PaginationSupport.PAGESIZE, )rX["=
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startIndex); x
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} ^W}(]jL
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public PaginationSupport findPageByCriteria <Sw>5M!j
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(final DetachedCriteria detachedCriteria, finalint -UD^O*U
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pageSize, %C}TdG(C
finalint startIndex){ c~j")o
return(PaginationSupport) ]!l]^/.
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getHibernateTemplate().execute(new HibernateCallback(){ zl~`>
publicObject doInHibernate !@2L g
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(Session session)throws HibernateException { Ci{,e%
Criteria criteria = !=sM `(=~
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detachedCriteria.getExecutableCriteria(session); =2-!ay:
int totalCount = ! n@*6
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((Integer) criteria.setProjection(Projections.rowCount lN@SfM4\
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()).uniqueResult()).intValue(); ~o"VZp
criteria.setProjection II=(>G9v
8 cN[t.S
(null); j A/xe
List items = ){'Ef_/R
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criteria.setFirstResult(startIndex).setMaxResults Id_?
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(pageSize).list(); fU?P__zU4
PaginationSupport ps = Atdr|2
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new PaginationSupport(items, totalCount, pageSize, 2@&|/O6_\h
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startIndex); bLSZZfq
return ps; eN]AJ%Ig
} s"tyCDc.c
}, true); v$H=~m
} B;k3YOg
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public List findAllByCriteria(final |Z), OW
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DetachedCriteria detachedCriteria){ b#h}g>l
return(List) getHibernateTemplate Rv-`6eyAA
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().execute(new HibernateCallback(){ ;F)j,Ywi)H
publicObject doInHibernate {=Z xF
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(Session session)throws HibernateException { )qyJwN
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Criteria criteria = :>y?B!=
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detachedCriteria.getExecutableCriteria(session); -'q#u C
return criteria.list(); *wvd[q h
} QQ*`tmy
}, true); RB,`I#z1f
} ]npsclvJ
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public int getCountByCriteria(final pZVT:qFF
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DetachedCriteria detachedCriteria){ *-.{->#Y
Integer count = (Integer) L6>;"]:f`
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getHibernateTemplate().execute(new HibernateCallback(){ E~4d6~s
publicObject doInHibernate xE.yh#?.k
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(Session session)throws HibernateException { 7I#<w[l>k
Criteria criteria = x>C_O\
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detachedCriteria.getExecutableCriteria(session); [|5gw3y
return 6I<^wS9j_
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criteria.setProjection(Projections.rowCount ep ,"@,,
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()).uniqueResult(); @ P'("qb~
} ]"wl*$N
}, true); 4qYT
return count.intValue(); X2[d15!9
} PLV-De
} h1_9Xp~N
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用户在web层构造查询条件detachedCriteria,和可选的 jYxmU8
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 -(;<Q_'s{"
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PaginationSupport的实例ps。 N!Q~?/!d
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ps.getItems()得到已分页好的结果集 5ns.||%k
ps.getIndexes()得到分页索引的数组 ~%D=\iE
ps.getTotalCount()得到总结果数 'CfM'f3uu
ps.getStartIndex()当前分页索引 6?(Z f
ps.getNextIndex()下一页索引 !RPPwvNk4
ps.getPreviousIndex()上一页索引 ;+Sc Vz
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 0;X0<IV
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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 )*m#RqLQ8
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一下代码重构了。 `*ml/% \
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我把原本我的做法也提供出来供大家讨论吧: &f"kWOe$X
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首先,为了实现分页查询,我封装了一个Page类: Gc0/*8u/
java代码: [CAV"u)0
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/*Created on 2005-4-14*/ iqAME%m
package org.flyware.util.page; `/+PZqdC
n u!tk$Q
/** =AVr<kP
* @author Joa ;R4qE$u2^
* cpJ(77e
*/ Ed ,O>(
publicclass Page { c)Ep<W<r1
o8h1
/** imply if the page has previous page */ ecqL;_{o
privateboolean hasPrePage; slRD /
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/** imply if the page has next page */ 863PVce",}
privateboolean hasNextPage; 5.o{A#/NTl
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/** the number of every page */ \NTNB9>CO
privateint everyPage; o?]g
:,*{,^2q:
/** the total page number */ g0M9v]c
privateint totalPage; G&f~A;'7k
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/** the number of current page */ NUjo5.7
privateint currentPage; B 4my
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/** the begin index of the records by the current P{{U
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query */ aa10vV
privateint beginIndex; $%5f
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/** The default constructor */ X GhV?
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public Page(){ { kF"<W
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} MDqUl:]
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/** construct the page by everyPage r1o_i;rg
* @param everyPage = m6yH_`@
* */ :!nBTw
public Page(int everyPage){ 4Bc<
this.everyPage = everyPage; #Emz9qTsce
} Gi*GFv%xB
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/** The whole constructor */ jh3XG
public Page(boolean hasPrePage, boolean hasNextPage, xO nW~Z
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int everyPage, int totalPage, JLZ=$ d
int currentPage, int beginIndex){ _8;)J
this.hasPrePage = hasPrePage; 'CkN
this.hasNextPage = hasNextPage; WI+ 5x
this.everyPage = everyPage; w:~Y@b~D
this.totalPage = totalPage; ""2g{!~r
this.currentPage = currentPage; ; Da[jFP
this.beginIndex = beginIndex; yxpDQO~x
} vxrRkOU1
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/** acdWU"<
* @return OYC\+
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* Returns the beginIndex. tEE1`10Mt
*/ 83ajok4E
publicint getBeginIndex(){ lx vRF93a.
return beginIndex; _a e&@s1
} 5W29oz}-S
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/** /j0zb&
* @param beginIndex :?}U Z#
* The beginIndex to set. V&>\U?q:
*/ !^/Mn
publicvoid setBeginIndex(int beginIndex){ %^C.e*
this.beginIndex = beginIndex; 5cza0CriJ
} nfV32D|3
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/** qK9\oB%s7
* @return mm5y'=#
* Returns the currentPage. L`!M3c@u
*/ }}VB#
publicint getCurrentPage(){ b35Z1sfD
j
return currentPage; z U~o"Jv
} UI,i2<&
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/** ZPISclSA+
* @param currentPage vj23j[!|
* The currentPage to set. Po:)b
*/ EpO5_T_
publicvoid setCurrentPage(int currentPage){ bBFdr
this.currentPage = currentPage; j+_pF<$f:
} 1;4]
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/** VTQxg5P c
* @return ]757oAXl
* Returns the everyPage. s]X]jfA.
*/ )/hb9+S
publicint getEveryPage(){ gDmwJr
return everyPage; V|h/a\P
} {Y%X
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/** `Xbk2KD p
* @param everyPage 1f"LAs`%
* The everyPage to set. vIoV(rc+
*/ Y68T&swD
publicvoid setEveryPage(int everyPage){ "z^&>#F
this.everyPage = everyPage; D&xbtJd
} |Ki\Q3O1
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/** Z]I[?$y
* @return #NAlje( 7
* Returns the hasNextPage. NY5?T0/[
*/ 0#}@-e
publicboolean getHasNextPage(){ zk[%YG&
return hasNextPage; 4DL;/Z:
} O^D$ ~
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/** Di3<fp#w#
* @param hasNextPage 0@9.h{s@
* The hasNextPage to set. uM8YY[b
*/ *S).@j\{W
publicvoid setHasNextPage(boolean hasNextPage){ g2=5IU<
this.hasNextPage = hasNextPage; LDJ=<c!
} fR>(b?C
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/** {-sy,EYcw
* @return >qJRpO
* Returns the hasPrePage. k-LB %\p
*/ Tm8c:S^uq)
publicboolean getHasPrePage(){ ^oFg5
return hasPrePage; yTDlDOmV!
} V}l>p?
U20G{%%
/** c1IK9X*
* @param hasPrePage ])=k";76
* The hasPrePage to set. *q8L$D
*/ .TN9N
publicvoid setHasPrePage(boolean hasPrePage){ EHT5Gf
this.hasPrePage = hasPrePage; ndkV(#wQS
} PNSZ
j#
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/** bF88F_
* @return Returns the totalPage. $vS`w4Y
* N/A.1W
*/ OT_w<te
publicint getTotalPage(){
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return totalPage; M]?#]3XBNo
} "+js7U-
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/** Tc6H%itV
* @param totalPage 4#?OxvH
* The totalPage to set. p7Yej(B
*/ .[1"Med J
publicvoid setTotalPage(int totalPage){ ':71;^zXf
this.totalPage = totalPage; #Nt?4T<
} C:n55BE9
Q(-:)3g[aL
} *`:zSnu
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 6]dK,
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个PageUtil,负责对Page对象进行构造: c <[?Z7y
java代码: }>cQ}6n.
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/*Created on 2005-4-14*/ S1pikwB
package org.flyware.util.page; r'/7kF- 5
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import org.apache.commons.logging.Log; 8>Hnv]p
import org.apache.commons.logging.LogFactory; d ,| W
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/** C7`FM@z
* @author Joa r%hnl9
* }d2]QD#O
*/ 4/$ $?w4
publicclass PageUtil { 00'R1q4
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privatestaticfinal Log logger = LogFactory.getLog 8$3G c"=
k,S'i#4q4
(PageUtil.class); c+/SvRx^>
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/** />(e.)f
* Use the origin page to create a new page s@C@q(i6
* @param page i,BE]w
* @param totalRecords F>,kKR-
* @return p]uwGWDI
*/ ir<HC 'D[
publicstatic Page createPage(Page page, int d#.9!m~.
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totalRecords){ Kw}-<y
return createPage(page.getEveryPage(), 4,kT4_&,
08&DP^NS
page.getCurrentPage(), totalRecords); q&