Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 xty)*$C>
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 >Eqr/~Q
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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 DRuG5| {I:
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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 XX[CTh?O%
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分页支持类: ]@9ZUtU,;N
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java代码: uo[W|Q
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package com.javaeye.common.util; : XaBCF*
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import java.util.List; b[os0D95
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publicclass PaginationSupport { o%sx(g=q6
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publicfinalstaticint PAGESIZE = 30; II)
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privateint pageSize = PAGESIZE; nX|]JW
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privateList items; F0]xc
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privateint totalCount; uwo\FI
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privateint[] indexes = newint[0]; #d;/Me
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privateint startIndex = 0; Z|6,*XEc
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public PaginationSupport(List items, int L wP
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totalCount){ -0f,qNF
setPageSize(PAGESIZE); ZYo?b"6A
setTotalCount(totalCount); b>x03%
setItems(items); R8C#DB
setStartIndex(0); ()o[(Hx+ph
} z6x`O-\
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public PaginationSupport(List items, int jU0E=;1
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totalCount, int startIndex){ "^NsbA+
setPageSize(PAGESIZE); 4I!g?Moh
setTotalCount(totalCount); Z)'gj
setItems(items); ne9-
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setStartIndex(startIndex); G;Py%8
} 4c9a"v
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public PaginationSupport(List items, int 6'45c1e
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totalCount, int pageSize, int startIndex){ iph}!3f
setPageSize(pageSize); t+Au6/Dx?
setTotalCount(totalCount); KGJ *h
setItems(items); _:7:ixN[Ie
setStartIndex(startIndex); kY^ k*-v
} ae0t*;~
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publicList getItems(){ DVz_;m6)
return items; ODNZLCB~t
} gAr=fq-|
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publicvoid setItems(List items){ Q:U>nm>xA
this.items = items; hI 1or4V
} Yaj}_M-
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publicint getPageSize(){ %WlTx&jSgE
return pageSize; mnL+@mm
} nZ %%{#T7
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publicvoid setPageSize(int pageSize){ <rxtdI"3
this.pageSize = pageSize; (z 9M
} )f,9 h
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publicint getTotalCount(){ sf"vi i,1A
return totalCount; t-Uo
} #\Zr$?t|V
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publicvoid setTotalCount(int totalCount){ 2{<o1x,Ym
if(totalCount > 0){ \![ p-mW{
this.totalCount = totalCount; Q?>DbT6
int count = totalCount / 7#(0GZN9h%
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pageSize; X m3r)Bm'3
if(totalCount % pageSize > 0) (7Ln~J*
count++; pGd@%/]AO
indexes = newint[count]; Zm*q V!
for(int i = 0; i < count; i++){ V{UY_
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indexes = pageSize * >R}G
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} #Q'#/\5
}else{ `j8pgnY>5~
this.totalCount = 0; Cy dV$!&mP
} +w/B3b
} b/?)_pg
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publicint[] getIndexes(){ 4W#DLip9
return indexes; +{0v@6<(02
} >&ENrvaJ
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publicvoid setIndexes(int[] indexes){ ?Wc+
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this.indexes = indexes; [kf6bf@
} 9yz@hdG
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publicint getStartIndex(){ /@B2-.w
return startIndex; WK0:3q(P
} 6MNr H
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publicvoid setStartIndex(int startIndex){ \FIM'EKzu!
if(totalCount <= 0) vi28u xc
this.startIndex = 0; &0i$Y\g
elseif(startIndex >= totalCount) Fw:_O2
this.startIndex = indexes e07u@_'^
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[indexes.length - 1]; WLA&K]
elseif(startIndex < 0) q@g#DP+C
this.startIndex = 0; Dt!
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else{ (eAz
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this.startIndex = indexes ~ #7@;C<nt
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[startIndex / pageSize]; &(lQgi+^!
} F^Bk @
} rp+]f\]h
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publicint getNextIndex(){ {Fqwr>e
int nextIndex = getStartIndex() + 5'( T*"
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pageSize; QQHQ3\
if(nextIndex >= totalCount) NcBz("
return getStartIndex(); 4/%Y@Z5
else nRvaCAt^
return nextIndex; yj=OR|v
} \d*ts(/a*
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publicint getPreviousIndex(){ C`R<55x6
int previousIndex = getStartIndex() - iL2_ _TO
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pageSize; OAD W;fj
if(previousIndex < 0) Ot)S\s>
return0; ik#Wlz`4
else `5e{ec
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return previousIndex; |]9L#
} zk"8mTg
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} TW|- 0
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抽象业务类 DJ*mWi.
java代码: ANNVE},
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/** t|mK5aR4
* Created on 2005-7-12 bLSc=f&
*/ ^/6P~iK'
package com.javaeye.common.business; ;rF[y7\
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import java.io.Serializable; C BoCT3@~
import java.util.List; ,<Z,- 0S
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import org.hibernate.Criteria; <_ENC>NP
import org.hibernate.HibernateException; shw"TF>?zG
import org.hibernate.Session; +*Z'oC BJ,
import org.hibernate.criterion.DetachedCriteria; h!v<J
import org.hibernate.criterion.Projections;
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import gO)":!_n W
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org.springframework.orm.hibernate3.HibernateCallback; T2/:C7zL
import !n` |k
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org.springframework.orm.hibernate3.support.HibernateDaoS s2<[@@@q
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upport; ma+AFCi
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import com.javaeye.common.util.PaginationSupport; ":vEWp+g
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public abstract class AbstractManager extends El@*Fo
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HibernateDaoSupport { A*wf:
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privateboolean cacheQueries = false; RgA"`p7{
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privateString queryCacheRegion; 9^ZtbmUf
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publicvoid setCacheQueries(boolean atF#0*e>
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cacheQueries){ b,YNCb]H
this.cacheQueries = cacheQueries; ;Xy=;Z.]i
} o{! :N> (
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publicvoid setQueryCacheRegion(String \Dy|}LE
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queryCacheRegion){ )Z:D}r8[
this.queryCacheRegion = QF\nf_X
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queryCacheRegion; Y*PfU+y~
} g_`a_0v
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publicvoid save(finalObject entity){ /1v9U|j
getHibernateTemplate().save(entity); KMz!4N
} )S(Ly.
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publicvoid persist(finalObject entity){ e1LIk1`p
getHibernateTemplate().save(entity); i/%lB
} y/c3x*l.xL
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publicvoid update(finalObject entity){ [#q]B=JB
getHibernateTemplate().update(entity); -PAEJn5$O
} |Ia9bg'1U
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publicvoid delete(finalObject entity){ 8"9&x}
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getHibernateTemplate().delete(entity); &v0-$
} m;]wKd"
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publicObject load(finalClass entity, %ACW"2#(
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finalSerializable id){ 0Zi+x#&d
return getHibernateTemplate().load &.\7='$F
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(entity, id); =uH2+9.
} {V2"Pym?
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publicObject get(finalClass entity, 6<<"9mxK
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finalSerializable id){ &<]f-
return getHibernateTemplate().get f4b9o[,s2e
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(entity, id); <cp9+P <
} 'v~'NWfd
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publicList findAll(finalClass entity){ JRo/ HY+
return getHibernateTemplate().find("from v/q-{1
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" + entity.getName()); /oHCV0!0
} [jzsB:;XB&
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publicList findByNamedQuery(finalString ;na%*G`
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namedQuery){ {g<D:"Q
return getHibernateTemplate $TXxhd 6
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().findByNamedQuery(namedQuery); p>`rTaeZg
} Iz09O:ER
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publicList findByNamedQuery(finalString query, &Mk!qE<:N
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finalObject parameter){ %- 540V{q
return getHibernateTemplate *y?HaU
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().findByNamedQuery(query, parameter); j#n ]q{s4
} {,Q )D$i
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publicList findByNamedQuery(finalString query, *9EwZwE_K
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finalObject[] parameters){ -[L\:'Gp5
return getHibernateTemplate /'rj L<M
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().findByNamedQuery(query, parameters); v'@gUgC
} _xaum
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publicList find(finalString query){ 6:#o0OeBP
return getHibernateTemplate().find K=[7<b,:3
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(query); t<p#u=jOa
} z3tx]Ade
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publicList find(finalString query, finalObject Fvl\.
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parameter){ Xfq`k/ W
return getHibernateTemplate().find yS
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(query, parameter); .n]"vpWm[
} j#5a&Z
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public PaginationSupport findPageByCriteria NZvgkci_(u
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(final DetachedCriteria detachedCriteria){ STW?0B'Jr
return findPageByCriteria )[Tm[o?Y.
rv*{[K
(detachedCriteria, PaginationSupport.PAGESIZE, 0); L3, /7
} c| ^I}
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public PaginationSupport findPageByCriteria '@t$3
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(final DetachedCriteria detachedCriteria, finalint `MOw\Z)..
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startIndex){ @s LN
return findPageByCriteria V!He2<
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(detachedCriteria, PaginationSupport.PAGESIZE, U#[&(
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startIndex); !<p,G`r
} r N$0qo
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public PaginationSupport findPageByCriteria /4an@5.\C
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(final DetachedCriteria detachedCriteria, finalint m)tu~neM
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pageSize, ]/=R ABi
finalint startIndex){ S0^a)#D &
return(PaginationSupport) 7S a9
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getHibernateTemplate().execute(new HibernateCallback(){ ^^N|:80
publicObject doInHibernate Jl~ *@0(
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(Session session)throws HibernateException { WywS1viD
Criteria criteria = Dp([r
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detachedCriteria.getExecutableCriteria(session); }(nT(9|
int totalCount = EK';\}
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((Integer) criteria.setProjection(Projections.rowCount dR S:S_
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()).uniqueResult()).intValue(); xb,d,(^ ]R
criteria.setProjection )^ah, ;(
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(null); ^K?-+
List items = d?fS#Ryb
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criteria.setFirstResult(startIndex).setMaxResults Lnh=y2
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(pageSize).list(); 2RkW/)A9
PaginationSupport ps = +fKOX#%
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new PaginationSupport(items, totalCount, pageSize, cpdESc9W
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startIndex); _Si=Jp][
return ps; ?})A-$f ~
} i>Q!5
}, true); dCd~]CI
} V`I4"}M1
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public List findAllByCriteria(final w2DC5ei'
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DetachedCriteria detachedCriteria){ *fg2bz<~[B
return(List) getHibernateTemplate 28!C#.(h
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().execute(new HibernateCallback(){ 53i]Q;k [
publicObject doInHibernate h:aa^a~yi
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(Session session)throws HibernateException { E5ce=$o
Criteria criteria = "-Q+!byh
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detachedCriteria.getExecutableCriteria(session); ~lj[> |\Oj
return criteria.list(); 'ITq\1z
} Q~,Mzt"}W
}, true); P<PZ4hNx
} sA2-3V<t8
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public int getCountByCriteria(final P 45Irir
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DetachedCriteria detachedCriteria){ \&Yn)|!
Integer count = (Integer) F3|^b{'zO
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getHibernateTemplate().execute(new HibernateCallback(){ 1/}H
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publicObject doInHibernate =-U0r$sK+F
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(Session session)throws HibernateException { 'UlVc2%{
Criteria criteria = &K/?#
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detachedCriteria.getExecutableCriteria(session); KQ\K:#
return QG5WsuT
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criteria.setProjection(Projections.rowCount Kip&YB%rk
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()).uniqueResult(); MmT/J1zM
} I*u3e
}, true); RAW;ze*"
return count.intValue(); bZ`v1d
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} K%z!#RyJ4
} K\K& K~Z
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用户在web层构造查询条件detachedCriteria,和可选的 ]+D@E2E
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 !Z$d<~Mq q
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PaginationSupport的实例ps。 N~)-\T:ap
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ps.getItems()得到已分页好的结果集 Y1PR?c
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ps.getIndexes()得到分页索引的数组 bzi"7%c
ps.getTotalCount()得到总结果数 "Rj
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ps.getStartIndex()当前分页索引 s=8H<'l
ps.getNextIndex()下一页索引 v)
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ps.getPreviousIndex()上一页索引 s$M(-"mg
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 6`e{l+c=F
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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 )9eIo&Nl
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一下代码重构了。 C~En0 G1
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我把原本我的做法也提供出来供大家讨论吧: B;9,Qbb
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首先,为了实现分页查询,我封装了一个Page类: F[ E'R.:
java代码: '@{:FrG*U
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/*Created on 2005-4-14*/ 7b"fpB
package org.flyware.util.page; |
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/** Sdq}?- &Sa
* @author Joa alb3oipOB
* Y%
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*/ @O#!W]6NT6
publicclass Page { Cut~k"lv
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/** imply if the page has previous page */ @|Pm%K`1
privateboolean hasPrePage; *;A ;)'
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/** imply if the page has next page */ |1@O>GG
privateboolean hasNextPage; ZLQmEF[>
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/** the number of every page */ 7By7F:[ b
privateint everyPage; T@W:@,34
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/** the total page number */ )qxt<
privateint totalPage; _U~R
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/** the number of current page */ '?rR>$s
privateint currentPage; tc~gn!"
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/** the begin index of the records by the current d.&_j`\F
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query */ lNe4e6
privateint beginIndex; wv\X
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/** The default constructor */ !u7KgB<=/F
public Page(){ DGFSD Py[
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}
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/** construct the page by everyPage #BRIp(65-6
* @param everyPage ?1=.scmgDG
* */ k{vj,#
public Page(int everyPage){ +/B
this.everyPage = everyPage; ?N{\qF1Mz
} }3z3GU8Q-
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/** The whole constructor */ T!jh`;D+
public Page(boolean hasPrePage, boolean hasNextPage,
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int everyPage, int totalPage, N'b GL%
int currentPage, int beginIndex){ 1H-Wk
this.hasPrePage = hasPrePage; hDXTC_^s
this.hasNextPage = hasNextPage; 2s}S9
this.everyPage = everyPage; bm#5bhX\|
this.totalPage = totalPage; R}oN8
this.currentPage = currentPage; ILuQ.VhBVN
this.beginIndex = beginIndex; (;fJXgj.
} Pe:)zt0
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/** P>_O :xD
* @return 2Bt/co-~4
* Returns the beginIndex. u|<?mA!
*/ t w4,gW
publicint getBeginIndex(){ _9BL7W $;
return beginIndex; czRBuo+k+
} 9B~&d(Bm
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/** Tg)F.):
* @param beginIndex 2|k$Vfz
* The beginIndex to set. t jM9EP
*/ rxp|[>O<
publicvoid setBeginIndex(int beginIndex){ C^q|(G)
this.beginIndex = beginIndex; $:u*)&"t|
} YKe&Ph.
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/** QFnuu-82"
* @return ld(60?z>FH
* Returns the currentPage. i9 aR#
*/ !Yc:yF
publicint getCurrentPage(){ b`e_}^,c
return currentPage; Ug*B[q/
} ~&~4{
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/** hNc8uV{r=
* @param currentPage CVO_F=;
* The currentPage to set. nf
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*/ ,!>
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publicvoid setCurrentPage(int currentPage){ 4Uny.C]
this.currentPage = currentPage; Yo %U{/e
} t'K+)OK
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/** U)dcemQY
* @return Lv+{@)
* Returns the everyPage. + }"+
*/ 2*snMA
publicint getEveryPage(){ mc]+j,d
return everyPage; H:~bWd'iz
} +c8`N'~
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/** [>NMuwtG
* @param everyPage %Za}q]?
* The everyPage to set. IYn`&jS{
*/ )B]"""J
publicvoid setEveryPage(int everyPage){ 5 =;cN9M@
this.everyPage = everyPage; |ts0j/A]Pi
} ]{=y8]7
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/** L\mF[Kd#+T
* @return &wi+)d
* Returns the hasNextPage. <HnJD/g
*/ !v2/sq$G
publicboolean getHasNextPage(){ `GE8?UO-
return hasNextPage; RrxbsG1HP
} sd4eG
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/** A"r<$S6
* @param hasNextPage Kjbk
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* The hasNextPage to set. Sk
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*/ Op0*tj2i),
publicvoid setHasNextPage(boolean hasNextPage){ Um/l{:S
this.hasNextPage = hasNextPage; xy`Y7W=
} aUL7]'q}
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/** RV]#Bg*[#
* @return >-c?+oy
* Returns the hasPrePage. p+g=Z<?`
*/ i7)J|(N2.
publicboolean getHasPrePage(){ 1{/Cr K/o
return hasPrePage; cQ1[x>OcU
} TQb/lY9*
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/** e
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* @param hasPrePage dQ;8,JzIw&
* The hasPrePage to set. Dt!KgI3
*/ $mK;{9Z
publicvoid setHasPrePage(boolean hasPrePage){ z1b@JCWE
this.hasPrePage = hasPrePage; ~g{1lcqQP
} 8$c) ]Bv
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/** p7AsNqEp
* @return Returns the totalPage. ]ovtH.y
* OM.-apzC
*/ j![1
publicint getTotalPage(){ ~5Fx[q
return totalPage; wYe;xk`>
} }alq~jY
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/** <f
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* @param totalPage 2aTq?ZR|8A
* The totalPage to set. n^1BtP0!
*/ q-CgXwU
publicvoid setTotalPage(int totalPage){ }\m.~$|[
this.totalPage = totalPage; Qu#[PDhb
} WS6Qp`c)e
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} H3 !9H
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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 .Ao
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个PageUtil,负责对Page对象进行构造: '-(Z.e~e
java代码: "KF]s.
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