Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 -gb@BIV#
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 te>Op 1R
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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 q?0&0
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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 [A;0IjKam
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分页支持类: v+d`J55
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java代码: gb^'u
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package com.javaeye.common.util; &_]bzTok
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import java.util.List; /)Weg1b
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publicclass PaginationSupport { (gutDUO;
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publicfinalstaticint PAGESIZE = 30; r,GgMk
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privateint pageSize = PAGESIZE; Hv
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privateList items; j W-K
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privateint totalCount; $|19]3T@Z
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privateint[] indexes = newint[0]; -ozcK
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privateint startIndex = 0; #6 $WuIG
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public PaginationSupport(List items, int R8j\CiV17
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totalCount){ pf&SIG
setPageSize(PAGESIZE); t1o_x}z4.
setTotalCount(totalCount); 3`njQvI\
setItems(items); [5P1 pkZ
setStartIndex(0); o~'UWU'#
} ~2XiKY;W?
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public PaginationSupport(List items, int X/S%0AwZ
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totalCount, int startIndex){ n=h!V$X
setPageSize(PAGESIZE); ^QTkre
setTotalCount(totalCount); |f[:mO
setItems(items); U;U19[]
setStartIndex(startIndex); RXhT{Ho(>
} d]^\qeG^p
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public PaginationSupport(List items, int 4+N9Ylh
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totalCount, int pageSize, int startIndex){ XpP}(A@G
setPageSize(pageSize); F:G
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setTotalCount(totalCount); |OBZSk1jp
setItems(items); <d3a
setStartIndex(startIndex); "A}2iI
} pxQh;w
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publicList getItems(){ O6\t_.
return items; 1F[W~@jW
} d((,R@N'
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publicvoid setItems(List items){ ue!wo-|#G
this.items = items; Q~)A
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} 'u%SI]*;>
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publicint getPageSize(){ $&0\BvS
return pageSize; Z+S1e~~
} Y:5Gp8Vi
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publicvoid setPageSize(int pageSize){ v,)vW5jGI
this.pageSize = pageSize; SMHQh.O?5
} {mB &xz:b
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publicint getTotalCount(){ #D8u#8Dz
return totalCount; RV6|sN[x>
} @?[}\9dW
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publicvoid setTotalCount(int totalCount){ D~f[ R g
if(totalCount > 0){ -Rr Qv(
this.totalCount = totalCount; M_#^zo
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int count = totalCount / FmtV[C#
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pageSize; R"{oj]d;$F
if(totalCount % pageSize > 0) ,) 3Eog\-
count++; 0d #jiG
indexes = newint[count]; EceD\}
for(int i = 0; i < count; i++){ A@
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indexes = pageSize * Qr*7bE(a
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} Ku] <$uo
}else{ 95BRZ!ts
this.totalCount = 0; xayd_RB 9
} :@sjOY
} TM`6:5ONv
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publicint[] getIndexes(){ rPoq~p[Y
return indexes; tD3v`Ke
} [O^mG
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publicvoid setIndexes(int[] indexes){ iVf8M$!m
this.indexes = indexes; 9':MD0P/M
} #~;:i
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publicint getStartIndex(){ Te&5IB-
return startIndex; ~#9(Q
} !l#n.Fx&3
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publicvoid setStartIndex(int startIndex){ ](sT,'
if(totalCount <= 0) \={A%pA;@{
this.startIndex = 0; U
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elseif(startIndex >= totalCount) U:O&FE
this.startIndex = indexes "A3V(~%!
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[indexes.length - 1]; j<_)Y(x>
elseif(startIndex < 0) ?wbf)fbq
this.startIndex = 0; pwr]lV$w
else{ 5s=L5]]r_j
this.startIndex = indexes s%S; 9T
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[startIndex / pageSize]; C;oT0(
} 'n4
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} GF^?#Jh
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publicint getNextIndex(){ 5TVA1
int nextIndex = getStartIndex() + jmh$6 N%
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pageSize; Id40yER
if(nextIndex >= totalCount) ttA0*
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return getStartIndex(); v[=TPfX0
else ^WmP,Xf#
return nextIndex; #H/suQZN"g
} w]Z:Y`
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publicint getPreviousIndex(){ }C9P--
int previousIndex = getStartIndex() - Rkz[x
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pageSize; ZH8Oidj`
if(previousIndex < 0) x"n)y1y
return0; &{H LYxh
else <&p0:S7
return previousIndex; _q 1E4z
} "o>gX'm*
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} !Di*y$`}b
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抽象业务类 ;`-@L
java代码: k<!xOg
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/** I\:(`)"r
* Created on 2005-7-12 +JRPd.B"@
*/ -mAi7[omh
package com.javaeye.common.business; N2Q%/}+,
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import java.io.Serializable; sj\kp
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import java.util.List; )-_To&S*
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import org.hibernate.Criteria; [nG@
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import org.hibernate.HibernateException; oV Hh
import org.hibernate.Session; \?rBtD(
import org.hibernate.criterion.DetachedCriteria; &WAJ;7f
import org.hibernate.criterion.Projections; 'r_NA!R
import ]9/{
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org.springframework.orm.hibernate3.HibernateCallback; $g+q;Y~i0
import ;Vh5nO
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org.springframework.orm.hibernate3.support.HibernateDaoS ^=V b'g3P~
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upport; 76r RF
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import com.javaeye.common.util.PaginationSupport; NoG`J$D
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public abstract class AbstractManager extends 47
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HibernateDaoSupport { hj|P*yKV
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privateboolean cacheQueries = false; U|}Bk/0.
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privateString queryCacheRegion; -cW'g
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publicvoid setCacheQueries(boolean l/F'W}
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cacheQueries){ K\a=bA}DG
this.cacheQueries = cacheQueries; 8KhE`C9z
} ^J{tOxO=l
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publicvoid setQueryCacheRegion(String "<5su5]
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queryCacheRegion){ B>"O~ gZ{#
this.queryCacheRegion = 1hnw+T<<W
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queryCacheRegion; 3iC$ "9!p
} $X%'je
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publicvoid save(finalObject entity){ ~i ImM|*0
getHibernateTemplate().save(entity); Zn]njf1x
} a2tRmil
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publicvoid persist(finalObject entity){ }E%#g#
getHibernateTemplate().save(entity); mzkv/
} FJl_2
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publicvoid update(finalObject entity){ Bw;LGEHi|
getHibernateTemplate().update(entity); ;mw$(ZKa#
} p2Fff4nQ
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publicvoid delete(finalObject entity){ xOAA1#
getHibernateTemplate().delete(entity); jR[3{ Reo
} 9X- w5$<
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publicObject load(finalClass entity, byW9]('e
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finalSerializable id){ 7eyVm;LQD
return getHibernateTemplate().load 71GyMtX
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(entity, id); WK<:(vu.
} r%^l~PN
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publicObject get(finalClass entity, IW<nfg
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finalSerializable id){ " A}S92
return getHibernateTemplate().get n8dJ6"L<"
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(entity, id); 5UgxuuP4
} c\\'x\J7
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publicList findAll(finalClass entity){ X'
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return getHibernateTemplate().find("from /#C}1emK
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" + entity.getName()); PqJB&:ZV
} yDil
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publicList findByNamedQuery(finalString ,R~{$QUl
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namedQuery){ 7l~d_<h
return getHibernateTemplate H`:2J8
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().findByNamedQuery(namedQuery); dN%*-p(
} Fzc8) *w
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publicList findByNamedQuery(finalString query, 'kC,pN{->
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finalObject parameter){ MN.h,^b
return getHibernateTemplate Ddr.kXIpo
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().findByNamedQuery(query, parameter); Sz_{ #-
} Z?);^m|T
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publicList findByNamedQuery(finalString query, Mkj`
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finalObject[] parameters){ jgW-&nK!
return getHibernateTemplate IOjp'6Yr
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().findByNamedQuery(query, parameters); `u't
} ~fV\
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publicList find(finalString query){ '<JNS8h
return getHibernateTemplate().find D["~G v
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(query); (T9Q6\sa
} hT0[O
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publicList find(finalString query, finalObject %wDE+&M
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parameter){ zarxv|
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return getHibernateTemplate().find BWWO=N
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(query, parameter); +}.~"
} R_7[7/a
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public PaginationSupport findPageByCriteria jv4O
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(final DetachedCriteria detachedCriteria){ GI[TD?s
return findPageByCriteria O?=YY@j
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); A5\00O~
} X9-WU\?UC
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public PaginationSupport findPageByCriteria %tvP\(]h
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(final DetachedCriteria detachedCriteria, finalint W0 n?S
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startIndex){ '
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return findPageByCriteria )-s9CWJv
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(detachedCriteria, PaginationSupport.PAGESIZE, pK|~G."6e
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startIndex); u^4$<fd
} ..K@'*u
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public PaginationSupport findPageByCriteria #hZ`r5GvTj
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(final DetachedCriteria detachedCriteria, finalint p=jpk@RX
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pageSize, [pRRBMho
finalint startIndex){ 1`Ig A0V`"
return(PaginationSupport) iCtDV5
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getHibernateTemplate().execute(new HibernateCallback(){ kdP*{
publicObject doInHibernate $A;%p6PO)
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(Session session)throws HibernateException { )yt_i'D}
Criteria criteria = (Qcd !!
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detachedCriteria.getExecutableCriteria(session); yp!7^
int totalCount = A/c #2
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((Integer) criteria.setProjection(Projections.rowCount Pxvf"SXX
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()).uniqueResult()).intValue(); N;q)[Dr
criteria.setProjection B{lj.S`mB
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(null); c<a)Yqf"]
List items = *yZ `aKfH
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criteria.setFirstResult(startIndex).setMaxResults z}a9%Fb
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(pageSize).list(); }ip3d m
PaginationSupport ps = 0g`$Dap
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new PaginationSupport(items, totalCount, pageSize, I'E7mb<2
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startIndex); 4o<rj4G>
return ps; #I"s{*
} _M)
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}, true); 2j;9USZ
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} %#<MCiaK
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public List findAllByCriteria(final b]b+PK*h
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DetachedCriteria detachedCriteria){ h5Ee*De
return(List) getHibernateTemplate >i_ #q$o
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().execute(new HibernateCallback(){ 7tP%tp
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publicObject doInHibernate lv>^P>S(O
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(Session session)throws HibernateException { +P=IkbxAO
Criteria criteria = .|e8v _2J
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detachedCriteria.getExecutableCriteria(session); 4:9N]1JCb
return criteria.list(); mIZ6[ ?
} P?ms^
}, true); |[)n.N65=
} #:NY9.\o
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public int getCountByCriteria(final =<%[P9y
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DetachedCriteria detachedCriteria){ EO`eg]
Integer count = (Integer) ?2%;VKN4
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getHibernateTemplate().execute(new HibernateCallback(){ wJZuJ(
publicObject doInHibernate O.DO,]Uh
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(Session session)throws HibernateException { neQ~h4U"
Criteria criteria = [DZ|Ltv
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detachedCriteria.getExecutableCriteria(session); G}Ko*:fWS
return ?C`r3
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criteria.setProjection(Projections.rowCount X;1yQ|su
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()).uniqueResult(); p ,.6sk
} aJQzM
}, true); fC".K
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return count.intValue(); !nsx!M
} %:v<&^oDlm
} ?>Ngsp>-P
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用户在web层构造查询条件detachedCriteria,和可选的 !FwNq'Q8$
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ? G`6}NP
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PaginationSupport的实例ps。 as(/
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ps.getItems()得到已分页好的结果集 J 5(^VKj
ps.getIndexes()得到分页索引的数组 {- &`@V
ps.getTotalCount()得到总结果数 S=gby
ps.getStartIndex()当前分页索引 "x vizvR
ps.getNextIndex()下一页索引 U:z5`z!
ps.getPreviousIndex()上一页索引 ]q~bi<E9W
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Cs(sar:7
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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 &)jq3
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一下代码重构了。 bZ_TW9mq
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我把原本我的做法也提供出来供大家讨论吧: mITNx^p4f
;:&|DN3;
首先,为了实现分页查询,我封装了一个Page类: QWnGolN
java代码: vz~Oi
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/*Created on 2005-4-14*/ z)(W
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package org.flyware.util.page; Rx.v/H
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/** r6nnRN/S=
* @author Joa :w-:B^VB
* +TyN;e
*/ P@keg*5@
publicclass Page { #N"u 0
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/** imply if the page has previous page */ "%)g^Atp>
privateboolean hasPrePage; KIi:5Y
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/** imply if the page has next page */ eXMIRus(
privateboolean hasNextPage; -r_,#LR!l
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/** the number of every page */ 5|=J\Lp2I
privateint everyPage; 9|lLce$
WrSc@j&Ycv
/** the total page number */ KzP{bK5/
privateint totalPage; -|Zzs4bx
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/** the number of current page */ y|)VNnWM
privateint currentPage; .$H"j>
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/** the begin index of the records by the current ,l6,k<
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query */ l -xc*lC
privateint beginIndex; x1?mE)n]
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/** The default constructor */ ,0a_ou"P=_
public Page(){ swxX3GR
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} :dh; @kp
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/** construct the page by everyPage #-\5O
* @param everyPage DnFzCJ
* */ 4qz+cB_
public Page(int everyPage){ bD0l^?Hu!
this.everyPage = everyPage; rVqQo`K\
} j<P;:
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/** The whole constructor */ W2#<]]-
public Page(boolean hasPrePage, boolean hasNextPage, [#C6K '
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int everyPage, int totalPage, ~f(5l.
int currentPage, int beginIndex){ /wLGf]0
this.hasPrePage = hasPrePage; 4U\}"Mk
this.hasNextPage = hasNextPage; =aZ d>{Y
this.everyPage = everyPage; @<{%r
this.totalPage = totalPage; B=r DU$z
this.currentPage = currentPage; ^hiY6N &
this.beginIndex = beginIndex; Jz~:
} !9WGZfK+0Y
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/** >]pZ;e$
* @return |67Jw2
* Returns the beginIndex. mLqqo2u
*/ zQ|2D*W
publicint getBeginIndex(){ [9${4=Kq
return beginIndex; J?w_DQa
} XZ~kXE;B(
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/** Ba@~:
* @param beginIndex UuWIT3W>%
* The beginIndex to set. ce9P-}d
*/ xy7A^7Li
publicvoid setBeginIndex(int beginIndex){ *:@KpYWx"
this.beginIndex = beginIndex; n82tZpn
} a8JAJkFB
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/** }[;ZZm?
* @return ?E"192,z@
* Returns the currentPage. D[/fs`XES
*/ ?@9v+Am!
publicint getCurrentPage(){ 6X*vCylI
return currentPage; Ku l<Q<
} O hk\P;}
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/** NgDhdOB
* @param currentPage /"8e,
* The currentPage to set. |@iM(MM[?
*/ OUi;f_*[r
publicvoid setCurrentPage(int currentPage){ ~tA ^[tK
this.currentPage = currentPage; FC] *^B
} %-blx)Pc
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/** EL$DvJ~
* @return <#h,_WP*
* Returns the everyPage. z3uR1vF'
*/ ZPmqoR[
publicint getEveryPage(){ J:N(U0U
return everyPage; <"5l<E
} 94+^K=lAX
}ouGxs+^[
/** {&n- @$?
* @param everyPage zsXgpnlHT
* The everyPage to set. Pp-N2t86#2
*/ *~)6 sm
publicvoid setEveryPage(int everyPage){ T;92M}\
this.everyPage = everyPage; uaF-3
} oZiW4z*Wh
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/** YCD|lL#
* @return %]_: \!
* Returns the hasNextPage. 7HDc]&z
*/ HLW_Y|QaFo
publicboolean getHasNextPage(){ 'z.
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return hasNextPage; ^~H{I_Y
} @KTuG ?.
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/** {s
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* @param hasNextPage u2oS Ci
* The hasNextPage to set. zWC| Qe
*/ L;RE5YrH%6
publicvoid setHasNextPage(boolean hasNextPage){ }ssV"5M
this.hasNextPage = hasNextPage; $pES>>P
} v0\l~_|H
S[zvR9AW&
/** $H@SXx
* @return &s+l/;3
* Returns the hasPrePage. ~.W]x~X$
*/ r'OqG^6JFN
publicboolean getHasPrePage(){ SUc%dpXZa
return hasPrePage; UH!(`Z\C
} 3J#LxYK
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/** KV_/fa~Ry
* @param hasPrePage =~+ WJN
* The hasPrePage to set. =xo0T 6
*/ 4/b.;$
publicvoid setHasPrePage(boolean hasPrePage){ cW:y^(X ii
this.hasPrePage = hasPrePage; `j>5W<5q\
} ^cYB.oeu
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/** 5skN'*oG
* @return Returns the totalPage. L]kBY2c
* |Mb{0mKb
*/ dEJqgp}\p
publicint getTotalPage(){ {$^'oRk
return totalPage; ?P'$Vxl
} <l<O2 l
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/** =P(*j7=
* @param totalPage f!x9%
* The totalPage to set. 7l53&,s
*/ L!cOg8Z
publicvoid setTotalPage(int totalPage){ s * (a
this.totalPage = totalPage; 6$R9Y.s>Z
} =-2~>B
<,M"kF:
} M`cxxDj&j
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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 `MU~N_
f7x2"&?vg
个PageUtil,负责对Page对象进行构造: 'zI(OnIS
java代码: p / ITg
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/*Created on 2005-4-14*/ t8*Jdd^3Z/
package org.flyware.util.page; VE+H! ob
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import org.apache.commons.logging.Log; d6J/)nl
import org.apache.commons.logging.LogFactory; v6*0@/L
M
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/** RrMEDMhk6
* @author Joa nJ;^Sz17Q
* :A zT=^S
*/ P 2WAnm
publicclass PageUtil { oai=1vt@
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privatestaticfinal Log logger = LogFactory.getLog N9w"Lb
w)EYj+L
(PageUtil.class); +x2JC' -H
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/** 7X>IS#W]
* Use the origin page to create a new page q_b!+Y
* @param page <