Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 \8`^QgV`@
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 S.^x)5/,,T
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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 BF
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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 Rr>""
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分页支持类: +N!/>w]n
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java代码: qb5IpI{U
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package com.javaeye.common.util; k_1oj[O
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import java.util.List; cQh=Mri]
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publicclass PaginationSupport { /(bn+l}W
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publicfinalstaticint PAGESIZE = 30; e3kdIOu5
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privateint pageSize = PAGESIZE; Zh_P
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privateList items; 0WAOA6
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privateint totalCount; UFUm-~x`
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privateint[] indexes = newint[0]; iPrAB*
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privateint startIndex = 0; <(Ktf0'__
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public PaginationSupport(List items, int kZS&q/6A*
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totalCount){ ooT~R2u
setPageSize(PAGESIZE); BO;LK-V
setTotalCount(totalCount); I^S{V^Ty
setItems(items); S]biN]+7s
setStartIndex(0); 9|//_4]
} e6^iakSd.L
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public PaginationSupport(List items, int XwdehyPhT2
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totalCount, int startIndex){ #:/-8Z(0
setPageSize(PAGESIZE); ZAMS;e+e
setTotalCount(totalCount); F6)/Iiv
setItems(items); DKqO5e\l8@
setStartIndex(startIndex); Zh.[f+ l]
} P3V}cGZ
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public PaginationSupport(List items, int y?{YQ)fj
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totalCount, int pageSize, int startIndex){ R~(_m#6`:
setPageSize(pageSize); z@J;sz
setTotalCount(totalCount); Cg&cz]*q|
setItems(items); -44''w?z
setStartIndex(startIndex); !u|s|6{\
} Sc&p*G
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publicList getItems(){ 6w^Fee`>]
return items; gNzamorv[
} \+sP<'~M
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publicvoid setItems(List items){ /<oBgFMoJ
this.items = items; G7H'OB
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} rfxLCiV
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publicint getPageSize(){ )F4P-u
return pageSize; 6B>H75S+H
} QsH Fk5)
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publicvoid setPageSize(int pageSize){ W=T,hOyh<W
this.pageSize = pageSize; f}F
} viR-h
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publicint getTotalCount(){ 2:& [r*
return totalCount; 2u'h,on?
} "WHt9 yZ
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publicvoid setTotalCount(int totalCount){ bO?Us
if(totalCount > 0){ }z8HS<
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this.totalCount = totalCount; `=cOTn52
int count = totalCount / 9dD;Z$x&Xk
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pageSize; ]AzDkKj
if(totalCount % pageSize > 0) uPtS.j=
count++; F^|4nBd*ub
indexes = newint[count]; 2s:$4]K D
for(int i = 0; i < count; i++){ }N<> z
indexes = pageSize * G8_|w6
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} vS'5Lm
}else{ ,\n%e'
this.totalCount = 0; A&6qt
} C|Vz
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} o2M4?}TpIV
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publicint[] getIndexes(){ |VD}:
return indexes; )$e_CJ}9e
} 7cJh^M
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publicvoid setIndexes(int[] indexes){ LdM9k(
this.indexes = indexes; F[5\
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} gT~Yn~~b
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publicint getStartIndex(){ /DBldL7yi
return startIndex; $q~:%pQv
} s>^$: wzu
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publicvoid setStartIndex(int startIndex){ 3A.T_mGCs
if(totalCount <= 0) {y
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this.startIndex = 0; jh&WL
elseif(startIndex >= totalCount) 4w5mn6 MxR
this.startIndex = indexes u$?t |Ll
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[indexes.length - 1]; 9n#Em
elseif(startIndex < 0) ![*7HE>},
this.startIndex = 0; J#^oUq
else{ i+HHOT
this.startIndex = indexes x<%V&<z1g
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[startIndex / pageSize]; k3wAbGp
} #ig* !
} <^(g<B`>
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publicint getNextIndex(){ CsND:m
int nextIndex = getStartIndex() + Tp?l;DU
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pageSize; ;K9rE3
if(nextIndex >= totalCount) oH|<(8efD
return getStartIndex(); .;xt{kK
else AH#eoKu
return nextIndex; _ X*
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} !:^lTvYWZH
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publicint getPreviousIndex(){ +Ks! 9d*k<
int previousIndex = getStartIndex() - nmZJ%n
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pageSize; 06#40-
if(previousIndex < 0) )6
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return0; 4/tp-dBip
else PV_q=70%T
return previousIndex; w_hGWpm
} 7FiQTS B:
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} 41[1_ p(
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抽象业务类 _a 40lcP
java代码: VV1I2YcKt
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/** )Q%hd |R
* Created on 2005-7-12 -}Iw!p#O3
*/ Uxyj\p
package com.javaeye.common.business; cj!Ew}o40D
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import java.io.Serializable; U<*8KiI
import java.util.List; 0ThX1)SH
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import org.hibernate.Criteria; 2-<i#nA3
import org.hibernate.HibernateException; dlx"L%
import org.hibernate.Session; UpU2H4
import org.hibernate.criterion.DetachedCriteria; R}-<ZJe
import org.hibernate.criterion.Projections; +W6QtB6
import ]EhW
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org.springframework.orm.hibernate3.HibernateCallback; W_E0+
import
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org.springframework.orm.hibernate3.support.HibernateDaoS 6?3f+=e"~!
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upport; h8Bs=T
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import com.javaeye.common.util.PaginationSupport; ;=FSpZ@
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public abstract class AbstractManager extends |aT&rpt
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HibernateDaoSupport { ; SS/bS|
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privateboolean cacheQueries = false; uP-I7l0i1
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privateString queryCacheRegion; o"Dk`L2
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publicvoid setCacheQueries(boolean 4[ 7)$
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cacheQueries){ {v,O
this.cacheQueries = cacheQueries; ue5C
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} E26 zw9d
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publicvoid setQueryCacheRegion(String 9"=1 O
DO #!ce
queryCacheRegion){ FC:+[.fi
this.queryCacheRegion = R*l#[D5A
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queryCacheRegion; fR&;E
} 6,707h
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publicvoid save(finalObject entity){ }J~
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getHibernateTemplate().save(entity); R<J1bH1n3
} _7h:NLd
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publicvoid persist(finalObject entity){ [=})^t?8
getHibernateTemplate().save(entity); atW=xn
} c==5 cMUg
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publicvoid update(finalObject entity){ (^:0g.~c
getHibernateTemplate().update(entity); ,[
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} #^+C
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publicvoid delete(finalObject entity){ 4pin\ZS:C
getHibernateTemplate().delete(entity); 29xm66
} x.+ r.cAXH
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publicObject load(finalClass entity, V!Px975P
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finalSerializable id){ 4@b~)av)
return getHibernateTemplate().load y h
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(entity, id); $S_xrrE#
} M x/G^yO9
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publicObject get(finalClass entity, $Z{ap
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finalSerializable id){ Dsl,(qm5
return getHibernateTemplate().get l@
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(entity, id); qT<OiIMj^
} B<99-7x3
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publicList findAll(finalClass entity){ x6i7x"
return getHibernateTemplate().find("from M+7&kt0;
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" + entity.getName()); \gBsAZE
} ma +iIt;
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publicList findByNamedQuery(finalString Ihd{@6m
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namedQuery){ JE a~avyJ
return getHibernateTemplate tJ"8"T#6Vr
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().findByNamedQuery(namedQuery);
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} FO"sE`
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publicList findByNamedQuery(finalString query, Jv,*rQH
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finalObject parameter){ b"DV8fdX
return getHibernateTemplate 9J*M~gKbz
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().findByNamedQuery(query, parameter); pR3@loFQ`o
} >@Nn_d
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publicList findByNamedQuery(finalString query, X,]E {
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finalObject[] parameters){ c:J;Q){Xz
return getHibernateTemplate '`)r<lYN,
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().findByNamedQuery(query, parameters); A~@u#]]<n
} (~6D`g`B
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publicList find(finalString query){ lYF~CNvE
return getHibernateTemplate().find W
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(query); CeZ+!-lG
} Y"n$d0%
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publicList find(finalString query, finalObject !kTI@103Wd
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parameter){ 8]`LRzM
return getHibernateTemplate().find wNfWHaH" m
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(query, parameter); }akF=/M
} aqw;T\GI+~
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public PaginationSupport findPageByCriteria `y^tCJ2u*
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(final DetachedCriteria detachedCriteria){ Knjg`f
return findPageByCriteria u ?
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); /c&;WlE/n
} r(VGdG
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public PaginationSupport findPageByCriteria sTb@nrRxH
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(final DetachedCriteria detachedCriteria, finalint * NB:"1x
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startIndex){ !W4X4@
return findPageByCriteria @V7HxW7RX
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(detachedCriteria, PaginationSupport.PAGESIZE, ,ix> e
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startIndex); z'!sc"]W6
} Ec/-f`8
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public PaginationSupport findPageByCriteria oIJ.Tv@N(
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(final DetachedCriteria detachedCriteria, finalint V6CRl&ZKO
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pageSize, |4_[wX
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finalint startIndex){ h{Zd, 9H
return(PaginationSupport) gK6_vS4K)
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getHibernateTemplate().execute(new HibernateCallback(){ pR,eus;8
publicObject doInHibernate H wu(}
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(Session session)throws HibernateException { !8Mi+ZV
Criteria criteria = 8%,u~ELA
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detachedCriteria.getExecutableCriteria(session); Wu1">|
int totalCount = Lc?q0x^s
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((Integer) criteria.setProjection(Projections.rowCount q=J8SvSRl
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()).uniqueResult()).intValue(); u]uUm1Er
criteria.setProjection |/M^q{h&7s
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(null); }Y=X{3+~.
List items = F5(D A
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criteria.setFirstResult(startIndex).setMaxResults +*')0I
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(pageSize).list(); 'k1vV
PaginationSupport ps = px~ :'U
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new PaginationSupport(items, totalCount, pageSize, lI&5.,2MP
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startIndex); {*NM~yQ
return ps; upc-Qvk
} #FwTV@
}, true); dSkx*#FEE
} 9N*!C{VW
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public List findAllByCriteria(final d+iV19 #i
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DetachedCriteria detachedCriteria){ #sJL"GB
return(List) getHibernateTemplate D3.$Vl,.
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().execute(new HibernateCallback(){ 7+c}D>/`:
publicObject doInHibernate EjjW%"C,
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(Session session)throws HibernateException { hVLVMqd
Criteria criteria = E8Y(C_:s
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detachedCriteria.getExecutableCriteria(session); v9K=\ j
return criteria.list(); f$I$A(0P
} }u&,;]
}, true); 8oxYgj&~X
} <3WaFi u
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public int getCountByCriteria(final U3rpmml
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DetachedCriteria detachedCriteria){ 3zsjL=ta
Integer count = (Integer) 032PR;]
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getHibernateTemplate().execute(new HibernateCallback(){ _u QxrB"9
publicObject doInHibernate .cCB,re
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(Session session)throws HibernateException { 8;+dlWp
Criteria criteria = _WB*ArR
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detachedCriteria.getExecutableCriteria(session); d xk~
return gg+!e#-X
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criteria.setProjection(Projections.rowCount O@7={)6qc
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()).uniqueResult(); wNtPh&
} $-l\&V++F
}, true); &l;wb.%ijW
return count.intValue(); _2p D
} K!A;C#b!
} (+w.?l
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用户在web层构造查询条件detachedCriteria,和可选的 5
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 9Lp[y%{GP
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PaginationSupport的实例ps。 5lYzgt-oP
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ps.getItems()得到已分页好的结果集 M7.
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ps.getIndexes()得到分页索引的数组 1Uf8ef1,
ps.getTotalCount()得到总结果数 .N~YVul[a*
ps.getStartIndex()当前分页索引 6SVh6o@]
ps.getNextIndex()下一页索引 Ps=<@,dks
ps.getPreviousIndex()上一页索引 0{Bhr12V
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 yr,Oq~e
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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 !dZpV~g0
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一下代码重构了。 u(b Pdf@kz
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我把原本我的做法也提供出来供大家讨论吧: Y&y5^nG
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首先,为了实现分页查询,我封装了一个Page类: [&H?--I
java代码: +E8}5pDt
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/*Created on 2005-4-14*/ IP-}J$$1
package org.flyware.util.page; 0\a;}
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/** ;&?l1Vu
* @author Joa g4CdzN~
* = }6l.9
*/
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publicclass Page { $bo 5:c
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/** imply if the page has previous page */ gW_^GrK pI
privateboolean hasPrePage; uU#7SX(uu
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/** imply if the page has next page */ & GM&,
privateboolean hasNextPage; vddh 2G
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/** the number of every page */ "F8A:tR
privateint everyPage; 8"2X 8C8
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/** the total page number */ L7 f'
privateint totalPage; `z]MQdE_w
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/** the number of current page */ Q?"-[6[v
privateint currentPage; XF=GmkO
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/** the begin index of the records by the current MF%>avRj
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query */ SYZS@o
privateint beginIndex; 6yRxb(
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/** The default constructor */ kTe0"
public Page(){ ;.wWw" )
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} Ls~F4ar$/
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/** construct the page by everyPage oN/T>&d
* @param everyPage Vg^@6zU
* */ +""8aA
public Page(int everyPage){ JkM f+!
this.everyPage = everyPage; Mk"V%)1k
} zZ\2fKrpg
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/** The whole constructor */ g6=w
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public Page(boolean hasPrePage, boolean hasNextPage, q<` g
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int everyPage, int totalPage, V6{P4 1_
int currentPage, int beginIndex){ T-L;iH~0
this.hasPrePage = hasPrePage; "0yO~;a
this.hasNextPage = hasNextPage; m+Bt9|d
this.everyPage = everyPage; beM}({:`
this.totalPage = totalPage; ]\Tcy [5
this.currentPage = currentPage; U]h5Q.<SG
this.beginIndex = beginIndex; !ENb \'>J>
} ?MhY;z`=
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/** 1*!`G5c,}
* @return {Noa4i
* Returns the beginIndex. ua-cX3E
*/ B[R1XpB7
publicint getBeginIndex(){ $A/$M\:
return beginIndex; Wi?37EHr
} b-x,`s
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/** c%+9uu3
* @param beginIndex fy`e)?46
* The beginIndex to set. f/:XIG
*/ Y:0SrB!\
publicvoid setBeginIndex(int beginIndex){ z7H[\ 4A!>
this.beginIndex = beginIndex; b6k'`vLA
} ^dzg'6M
k8;
/** D%0GXUp
* @return )D:I@`*
* Returns the currentPage. N}*|*!6hI
*/ n0T'"i[
publicint getCurrentPage(){ 'RlPj0Cg
return currentPage; JKkR963 O
} P*#H]Pv
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/** `.FvuwP
* @param currentPage P"<