Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 u^2/:L
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 _S*QIbO
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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 "cOBEhn%l
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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 ulEtZ#O{_
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分页支持类: QD-Bt=S7l
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java代码: r'|ei ,
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package com.javaeye.common.util; OzxiT +
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import java.util.List; w8KxEV=
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publicclass PaginationSupport { `$JOFLa
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publicfinalstaticint PAGESIZE = 30; or)fx/ %h
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privateint pageSize = PAGESIZE; Y'}c$*OkI
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privateList items; ]N1,"W}
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privateint totalCount; B>"-8#B[4
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privateint[] indexes = newint[0]; K)\D,5X^
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privateint startIndex = 0; oChf&W 8u
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public PaginationSupport(List items, int 0'zjPE#
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totalCount){ x;4m@)Mu
setPageSize(PAGESIZE); 5a&gdqg]
setTotalCount(totalCount); # M
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setItems(items); sI4
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setStartIndex(0); )%:
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} kWbY&]ZO
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public PaginationSupport(List items, int )R@Y$*fm
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totalCount, int startIndex){ f\:I1y
setPageSize(PAGESIZE); Z#GR)jb+
setTotalCount(totalCount); L'"od;(6R
setItems(items); 0U2dNLc
setStartIndex(startIndex); On+0@hh
}
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public PaginationSupport(List items, int iZ(p]0aP7
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totalCount, int pageSize, int startIndex){ On@p5YRwW
setPageSize(pageSize); ^<aj~0v
setTotalCount(totalCount); a
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setItems(items); G<~P||Lu^
setStartIndex(startIndex); "(a}}q 9-
} )9!J
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publicList getItems(){ L[:M[,?=`
return items; .4=A:9
} )VG_Y9;Xk:
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publicvoid setItems(List items){ hSk
this.items = items; S~ y.>X3"P
} z+?48}
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publicint getPageSize(){ _`9WNJiL
return pageSize; 9H%ixBnM
} h{PJ4U{W
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publicvoid setPageSize(int pageSize){ 8KzH
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this.pageSize = pageSize; ]mi)x63^
} ^;EwZwH[
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publicint getTotalCount(){ gf,[GbZ
return totalCount; ZZ].h2=K
} fp"GdkO#}i
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publicvoid setTotalCount(int totalCount){ :XO7#P
if(totalCount > 0){ t3.I ` Z
this.totalCount = totalCount; V##T G0
int count = totalCount / * \tR
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pageSize; 2u}ns8wn
if(totalCount % pageSize > 0) ^coj ETOv
count++; /5:qS\Zl
indexes = newint[count]; wV{VV?h}
for(int i = 0; i < count; i++){ Wp=&nh
indexes = pageSize * &$pA,Gjin\
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} p;vrPS
}else{ c=IjR3F
this.totalCount = 0; liH1r1M
} p/jAr+XM
} 9Cw !<
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publicint[] getIndexes(){ bj+foNvu\
return indexes; `Jl_'P}
} MPJ0>Ly
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publicvoid setIndexes(int[] indexes){ AyMbwCR"X
this.indexes = indexes; `?vI_>md'!
} mP ^*nB@,
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publicint getStartIndex(){ C2K<CDVw
return startIndex; 3;EBKGg|
} elb}]
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publicvoid setStartIndex(int startIndex){ 5{M$m&$1
if(totalCount <= 0) 8t&'Yk
this.startIndex = 0; +
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elseif(startIndex >= totalCount) x>[ gShAV!
this.startIndex = indexes A@I3:V
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[indexes.length - 1];
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elseif(startIndex < 0) 2}#VB;B
this.startIndex = 0; !9=Y(rb
else{ >
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this.startIndex = indexes f.U.(
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[startIndex / pageSize]; %A;s3]V
} ?B:],aztf
} 7Y*Q)DDy
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publicint getNextIndex(){
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int nextIndex = getStartIndex() + 4{ exv
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pageSize; 2v1dSdX,W
if(nextIndex >= totalCount) }719_DF
return getStartIndex(); <h1J+
else &}lRij&`
return nextIndex; N'0fB`:kz
} _."X# }W
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publicint getPreviousIndex(){ |>=\
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int previousIndex = getStartIndex() - _zFJ]7Ym.)
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pageSize; 5~SBZYI
if(previousIndex < 0) %967#XI[y
return0; 1s#GY<<
else C<iOa)_@Q
return previousIndex; )mRKIM}*W
} A-qpuI;f
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} hUMFfc?
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抽象业务类 Y t0s
java代码: SrSm%Dv
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/** / ,
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* Created on 2005-7-12 )]m_ L$9
*/ :X-\!w\
package com.javaeye.common.business; ("j*!Dsd
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import java.io.Serializable; #Xd#Ncj
import java.util.List; =`BPGfCb
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import org.hibernate.Criteria; ~dj4Q
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import org.hibernate.HibernateException; .2STBh.;
import org.hibernate.Session; jQ\/R~)O
import org.hibernate.criterion.DetachedCriteria; B?<Z(d7
import org.hibernate.criterion.Projections; OL$^7FB
import fsVr<m
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org.springframework.orm.hibernate3.HibernateCallback;
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import 0i9C\'W`
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org.springframework.orm.hibernate3.support.HibernateDaoS }WG -R
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upport; Pr^p
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import com.javaeye.common.util.PaginationSupport;
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public abstract class AbstractManager extends aQhr$aH
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HibernateDaoSupport { i"C?6R
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privateboolean cacheQueries = false; G,b1 u"
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privateString queryCacheRegion; $;%dQ!7*
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publicvoid setCacheQueries(boolean ,4z?9@wQ
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cacheQueries){ 2T#>66^@q
this.cacheQueries = cacheQueries; /w*;|4~Bf
} ^5![tTJ
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publicvoid setQueryCacheRegion(String $5m_)]w4a
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queryCacheRegion){ n`)wD~mk
this.queryCacheRegion = Zr@G
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queryCacheRegion; #2*2xt
} Dhe ]f#d
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publicvoid save(finalObject entity){ z;EnAy {9
getHibernateTemplate().save(entity); *]_GFixi
} 4FgY!k
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publicvoid persist(finalObject entity){ /!Kl
getHibernateTemplate().save(entity); 7Y(ySW
} P&@[ j0
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publicvoid update(finalObject entity){ PNMf5'@m
getHibernateTemplate().update(entity); x2gP, p-
} g$ oe00b
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publicvoid delete(finalObject entity){ F
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getHibernateTemplate().delete(entity); B>&eciY
} .8%mi'0ud
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publicObject load(finalClass entity, (e;9,~u)
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finalSerializable id){ ZXj;ymC'
return getHibernateTemplate().load Tse
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(entity, id); =
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} /RmHG
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publicObject get(finalClass entity, #TX=%x6
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finalSerializable id){ z3[0BWXs
return getHibernateTemplate().get -f-2!1&<3h
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(entity, id); qm)KO 4
} vYNh0)$%F
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publicList findAll(finalClass entity){ ?=uw0~O[
return getHibernateTemplate().find("from b]h]h1~hHH
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" + entity.getName()); R]Q4+
} o=
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publicList findByNamedQuery(finalString 1=t\|Th-
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namedQuery){ 9)qjW &`
return getHibernateTemplate '?~k`zK
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().findByNamedQuery(namedQuery); a,U =irBA
} %8V/QimHU
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publicList findByNamedQuery(finalString query, Xx0}KJq~"
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finalObject parameter){ k'BLos1W
return getHibernateTemplate Ek ,s6B)'d
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().findByNamedQuery(query, parameter); 2Ax HhD.
} 6tbH(
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publicList findByNamedQuery(finalString query, G1"=}Wt`
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finalObject[] parameters){ F62arDA
return getHibernateTemplate S{NfU/:
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().findByNamedQuery(query, parameters); X~Li`
} 1lNg} !)[K
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publicList find(finalString query){ (r^IW{IndX
return getHibernateTemplate().find /y,~?
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(query); x=qACoq
} rY>{L6d
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publicList find(finalString query, finalObject `
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parameter){ 5}R/C{fs
return getHibernateTemplate().find +6!.)Ea=
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(query, parameter); Z<|caT]Q(
} P$)9osr
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public PaginationSupport findPageByCriteria |Js96>B:
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(final DetachedCriteria detachedCriteria){ ~} mX#,
return findPageByCriteria sDCa&"6+@
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); (*%+!PS
} =ot`V; Q>
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public PaginationSupport findPageByCriteria w>X33Ff]8@
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(final DetachedCriteria detachedCriteria, finalint zu}h3n5
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startIndex){ N
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return findPageByCriteria VbtFM=Dg
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(detachedCriteria, PaginationSupport.PAGESIZE, ~2~KcgPsq
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startIndex); }d)>pH
} Z\{WBUR;4t
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public PaginationSupport findPageByCriteria CPGXwM=
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(final DetachedCriteria detachedCriteria, finalint H#G~b""mY
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pageSize, nrA}36 E
finalint startIndex){ [6
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return(PaginationSupport) {61NLF\0H
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getHibernateTemplate().execute(new HibernateCallback(){ -Tk~c1I#`
publicObject doInHibernate ha'oLm#
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(Session session)throws HibernateException { gB<p
Criteria criteria = Gn;eh~uw;l
+
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detachedCriteria.getExecutableCriteria(session); `ivr$b#
int totalCount = Uz H)fB
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((Integer) criteria.setProjection(Projections.rowCount bs]ret$?(q
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()).uniqueResult()).intValue(); T{|'<KT
criteria.setProjection P,~a'_w:|D
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(null); PF!Q2t5c3
List items = f b_tda",}
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criteria.setFirstResult(startIndex).setMaxResults .Kq>/6
(XRj##G{
(pageSize).list(); d Z"bc]z{
PaginationSupport ps = dp2".
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new PaginationSupport(items, totalCount, pageSize, S53 [Ja
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startIndex); 2X)E3V/*
return ps; Z[AJat@H
} XT= #+
}, true); 4lb3quY$Us
} =o _d2Ak
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public List findAllByCriteria(final Sd^e!?bp
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DetachedCriteria detachedCriteria){ 3VA8K@QiRm
return(List) getHibernateTemplate S5v>WI^0h
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().execute(new HibernateCallback(){ Gr?"okaA
publicObject doInHibernate C3bZ3vcW$
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(Session session)throws HibernateException { 5HL JkOV5
Criteria criteria = `-s+ zG
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detachedCriteria.getExecutableCriteria(session); 9T|7edl
return criteria.list(); D/{Tl
} /n?5J`6
}, true); **-%5~
} ?$;_a%v6
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public int getCountByCriteria(final \fU{$
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DetachedCriteria detachedCriteria){ \D, 0
Integer count = (Integer) ,`/!0Wmt
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getHibernateTemplate().execute(new HibernateCallback(){ G~a/g6M4
publicObject doInHibernate yKOf]m>#
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(Session session)throws HibernateException { ?8! 4!P%n
Criteria criteria = i3;Z:,A4NN
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detachedCriteria.getExecutableCriteria(session); A~nq4@uj
return Ax0u \(p<^
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criteria.setProjection(Projections.rowCount N_q7ip%z
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()).uniqueResult(); %~^R Iwm
} [JMz~~F
}, true); SY <!-g<1F
return count.intValue(); xfO!v>
} *qY`MW
} N##3k-0Ao
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用户在web层构造查询条件detachedCriteria,和可选的 N;-+)=M,rf
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 IH[/fd0
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PaginationSupport的实例ps。 :;{U2q+
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ps.getItems()得到已分页好的结果集 :r^i0g|5P
ps.getIndexes()得到分页索引的数组 Iy|]U&`
ps.getTotalCount()得到总结果数 .yi.GRk
ps.getStartIndex()当前分页索引 xE;fM\7pu
ps.getNextIndex()下一页索引 9N=Dls
ps.getPreviousIndex()上一页索引 X_Y$-I$qd
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 q*Ns]f'a
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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 C"IPCJYn
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一下代码重构了。 |`qur5h`
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我把原本我的做法也提供出来供大家讨论吧: /o8`I
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首先,为了实现分页查询,我封装了一个Page类: <&l3bL
java代码: A8c'CMEm
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/*Created on 2005-4-14*/ JsfbY^wz
package org.flyware.util.page; H -.3r
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/** E# e=<R
* @author Joa ,E)bS7W
* &giJO-^
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*/ $vGl Z<3g
publicclass Page { #MGZje,I
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/** imply if the page has previous page */ *|euC"5c
privateboolean hasPrePage; (X>r_4W$
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/** imply if the page has next page */ 4"l(rg
privateboolean hasNextPage; {*jkx,|
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/** the number of every page */ 7zR7v
privateint everyPage; ' 'UiQ
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/** the total page number */ R8o9$&4_
privateint totalPage; En5I
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/** the number of current page */ xOTm-Cm9L
privateint currentPage; ih ,8'D4
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/** the begin index of the records by the current u@|GQXC
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query */ Sw'DS
privateint beginIndex; $`l- cSH;
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/** The default constructor */ VEb}KFyP
public Page(){ CCl*v
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} ua4QtDSs
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/** construct the page by everyPage G_42ckLq
* @param everyPage 2+"#
* */ N<N!it
public Page(int everyPage){ r<&d1fM;X
this.everyPage = everyPage; dBobVT'
} ;zSh9H
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/** The whole constructor */ *QjFrw3
public Page(boolean hasPrePage, boolean hasNextPage, )JuD !
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uo 7AU3\
int everyPage, int totalPage, wk8XD(&
int currentPage, int beginIndex){ T!v%NZj3
this.hasPrePage = hasPrePage; \P{VJ^)0
this.hasNextPage = hasNextPage; 1C .<@IZ
this.everyPage = everyPage; m{R`1cN=Hg
this.totalPage = totalPage; [0MVsc=
this.currentPage = currentPage; *QAK9mc
this.beginIndex = beginIndex; Z[0xqGYLB
} Qs;bVlp!H
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/** 17<\Q(YQ=
* @return }4eSB
* Returns the beginIndex. s|EP/=9i
*/ EkOBI[`
publicint getBeginIndex(){ ~2rZL
return beginIndex; ?LvZEiJ
}
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/** n!3_%K0!r&
* @param beginIndex -f Zm_FE
* The beginIndex to set. s)ZL`S?</
*/ mjB%"w!S
publicvoid setBeginIndex(int beginIndex){ ||qsoF5B]
this.beginIndex = beginIndex; i'`Z$3EF)
} ]'T-6
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/** GW`9SB
* @return Sfh \4h$H
* Returns the currentPage. BS+N
*/ E >SnH
publicint getCurrentPage(){ 3&3S*1b-H
return currentPage; ?N $
} ~poy`h'
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/** e[R364K
* @param currentPage #XC\=pZX
* The currentPage to set. ">CjnF2>R
*/ q|gG{9
publicvoid setCurrentPage(int currentPage){ [gH
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this.currentPage = currentPage; WI}P(!h\J
} FS1<f:
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/** 9Z
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* @return ;t"#7\
* Returns the everyPage. bnUd !/;
*/ =3/||b4c
publicint getEveryPage(){ *PZN Z{|m
return everyPage; ^U:pv0Qz
} ur*1I/v
jk 9K>4W
/** B{c,/{ =O
* @param everyPage 3{]i| 1&j
* The everyPage to set. oD~VK,.
*/ >,32~C
publicvoid setEveryPage(int everyPage){ 3Yg/-=U(
this.everyPage = everyPage; ^aXyho
} d
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/** p0'A\@|
* @return vpOzF>O
* Returns the hasNextPage. HPr5mWs:
*/ A*MlK"
publicboolean getHasNextPage(){ H.wp{m{
return hasNextPage; dO rgqz`e
} p# O%<S@?
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/** X^fMt]
* @param hasNextPage }MXZ
* The hasNextPage to set. yv4hH4Io
*/ ldi'@^
publicvoid setHasNextPage(boolean hasNextPage){ VEo>uR
this.hasNextPage = hasNextPage; R}>Gk
} BE}lzn=sF
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/** N<Ti[Q]G
* @return !t~S.`vF
* Returns the hasPrePage. 3vNo D
*/ |2{y'?,
publicboolean getHasPrePage(){ qK;n>BTe
return hasPrePage; F~{yqY5]n
} }_gCWz-5?
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/** d8dREhK&
* @param hasPrePage :eei<cn2
* The hasPrePage to set. e!G
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*/ ?&"cI5-
publicvoid setHasPrePage(boolean hasPrePage){ \7*9l%
this.hasPrePage = hasPrePage; mcp}F|ws
} aq,&W
q@
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/** )#IiHBF
* @return Returns the totalPage. aL+k1v[m
* FU5vo
*/ |UBR8
publicint getTotalPage(){ 1ciP+->$
return totalPage; w*$nG$
} sqj8c)6
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/** >vt#,8VAN
* @param totalPage ?Z*LTsPr
* The totalPage to set. y{U'\
*/ "7Zb)Ocb
publicvoid setTotalPage(int totalPage){ %HwPOEJ
this.totalPage = totalPage; y%`^*E&
} yi
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} lNls8@
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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 @H1pPr
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个PageUtil,负责对Page对象进行构造: o @~XX@5l
java代码: I zM =?,`
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/*Created on 2005-4-14*/ y 3c]zDjV
package org.flyware.util.page; 2,E&}a|;b
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import org.apache.commons.logging.Log; <P(d%XEl
import org.apache.commons.logging.LogFactory; QYyF6ht=!
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/** 9@:H9"w
* @author Joa =36vsps=
* |
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*/ bX=ht^e[
publicclass PageUtil { eIg '
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privatestaticfinal Log logger = LogFactory.getLog %* vYX0W"
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(PageUtil.class); 3yZtyXRPn
8/ZJkI
/** leg@ia
* Use the origin page to create a new page TW:vL~L
* @param page 573wK~9oMh
* @param totalRecords Q?I)1][ !"
* @return B`iQN7fd
*/ %n=!H
publicstatic Page createPage(Page page, int r/Qq-1E
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totalRecords){ s|"V$/X(W
return createPage(page.getEveryPage(), "|.>pD#0&
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page.getCurrentPage(), totalRecords); .A&Ey5
} +2|X 7wA
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/** NnGQ=$e
* the basic page utils not including exception KaBze67<|
J &u&G7#S
handler Bl3G_Ep
* @param everyPage =_D82`p
* @param currentPage Q^b_+M
* @param totalRecords 9Rb-QI
* @return page &gIu<*u<
*/ /^P^K
publicstatic Page createPage(int everyPage, int ;!Ojb
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currentPage, int totalRecords){ B#B$w_z
everyPage = getEveryPage(everyPage); J55K+
currentPage = getCurrentPage(currentPage); zTAt% w5
int beginIndex = getBeginIndex(everyPage, Haaungb"
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currentPage); E)09M%fe
int totalPage = getTotalPage(everyPage, F2AM/m^!q
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totalRecords); Iwize,J~X
boolean hasNextPage = hasNextPage(currentPage, 9K Ih}Q@P
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totalPage); NA]7qb%%<
boolean hasPrePage = hasPrePage(currentPage); [qIi_(%o
;]i&AAbj
returnnew Page(hasPrePage, hasNextPage, RR75ke[Hs
everyPage, totalPage, [WRs1$5
currentPage, ryW1OV6?_0
*;,=x<
beginIndex); !})/x~~e
} @zT.&1;`
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privatestaticint getEveryPage(int everyPage){ Ys+Dw-
return everyPage == 0 ? 10 : everyPage; JihI1C
} iL/(WAB_od
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privatestaticint getCurrentPage(int currentPage){ V/"XC3/n*
return currentPage == 0 ? 1 : currentPage; tURIDj%#p
} dV<M$+;s]
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privatestaticint getBeginIndex(int everyPage, int LCyci1\@
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currentPage){ 23_<u]V
return(currentPage - 1) * everyPage; c^6v7wT5
} e,Gv~ae9
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privatestaticint getTotalPage(int everyPage, int w>IkC+.?
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totalRecords){ &A*oQ3
int totalPage = 0; -=Q_E^'
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if(totalRecords % everyPage == 0) U^+9l?ol
totalPage = totalRecords / everyPage; ?"{+m
else !6@xX08z
totalPage = totalRecords / everyPage + 1 ; h$f/NSct2
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return totalPage; #E{aN?_
} [{}9"zB$x0
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privatestaticboolean hasPrePage(int currentPage){ oeDsJ6;
return currentPage == 1 ? false : true; .sbU-_ij@U
} ]n _-
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privatestaticboolean hasNextPage(int currentPage, cEsBKaN
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int totalPage){ -102W{V/T
return currentPage == totalPage || totalPage == <^~Xnstl
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0 ? false : true; u5H#(&Om
} p? iJ'K
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} 1.p?P]
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 i>ORCOOU
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体
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做法如下: 8kW9.
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 D8m?`^Zz
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的信息,和一个结果集List: vEtogkFA"
java代码: qt^%jIv
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/*Created on 2005-6-13*/ Q,#M
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package com.adt.bo; 'x+0
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