Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 :!M/9D*}0
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 vs/.'yD/C
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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 ;^}gC}tq
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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 uoYG@L2
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分页支持类: y]B?{m``6
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java代码: )z/+!y
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package com.javaeye.common.util; _uuxTNN0x*
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import java.util.List; K14e"w%6rs
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publicclass PaginationSupport { Gpws_jw
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publicfinalstaticint PAGESIZE = 30; `Nn=6[]
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privateint pageSize = PAGESIZE; %O`e!p
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privateList items; 6fhH)]0
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privateint totalCount; RU3:[(7
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privateint[] indexes = newint[0]; LfEeFF=#n
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privateint startIndex = 0; e`%U}_[d
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public PaginationSupport(List items, int 'c3P3`o,;
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totalCount){ xJtblZ1sr
setPageSize(PAGESIZE); :?%$={m
setTotalCount(totalCount); 6]yYiz2Xn
setItems(items); l2"{uCcA
setStartIndex(0); +jePp_3$O
} v1Tla]d
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public PaginationSupport(List items, int ^s/HbCA
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totalCount, int startIndex){ iB;EV8E
setPageSize(PAGESIZE); ES[H^}|Gi
setTotalCount(totalCount); K,{P
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setItems(items); 'M>QA"*48E
setStartIndex(startIndex); LeDty_
} ezn%*X
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public PaginationSupport(List items, int 68
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totalCount, int pageSize, int startIndex){ 4}@J]_]Z
setPageSize(pageSize); wQ
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setTotalCount(totalCount); 'thWo wE
setItems(items); O4w6\y3U
setStartIndex(startIndex); ?ACflU_k
} +eSNwR=
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publicList getItems(){ o2
return items; XKD0n^L[
} QOA7#H-m9
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publicvoid setItems(List items){ We&~]-b AW
this.items = items; U~8;y'
} 2Wwzcvs@
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publicint getPageSize(){ -`nQa$N-
return pageSize; wVU.j$+_#
} xj8yQ Y1
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publicvoid setPageSize(int pageSize){ HBHDu;u
this.pageSize = pageSize; \$GM4:R D
} mw2/jA7
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publicint getTotalCount(){
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return totalCount; {cmY`to
} W^{zlg
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publicvoid setTotalCount(int totalCount){ )Il)
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if(totalCount > 0){ 28,Hd!{
this.totalCount = totalCount; VfWU-lJ
int count = totalCount / /J''`Tf
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pageSize; KE>|,Ur
if(totalCount % pageSize > 0) v_M-:e3`
count++; xQLVFgd
indexes = newint[count]; @r7ekyO8)
for(int i = 0; i < count; i++){ /Kcp9Qx
indexes = pageSize * e
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} D6X0(pU0
}else{ D%[yAr;r
this.totalCount = 0; mX8k4$z
} .[mI9dc
} ?8AV-rRX
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publicint[] getIndexes(){ Rq`B'G9|c
return indexes; O5X@'.#rU
} in}d(%3h
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publicvoid setIndexes(int[] indexes){ JZ=ahSi
this.indexes = indexes; ,#n$YT7
} EWz,K]_'
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publicint getStartIndex(){ 1ym^G0"s
return startIndex; &+0WZ#VI
} {`RCh]W
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publicvoid setStartIndex(int startIndex){ ]#$l"ss,
if(totalCount <= 0) m9~cQ!m
this.startIndex = 0; 6:\0=k5
elseif(startIndex >= totalCount) vs=8x\W
this.startIndex = indexes *vFXe_.
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[indexes.length - 1]; O4`am:@
elseif(startIndex < 0) 3m;*gOLk6
this.startIndex = 0; ?7;_3+T#
else{ 0eJqDCmH
this.startIndex = indexes "~V|p3
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[startIndex / pageSize]; ''p7!V?
} prypo.RI
} 0c{-$K}
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publicint getNextIndex(){ A^L8"
int nextIndex = getStartIndex() + Y8i'=Po%,
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pageSize; #_(t46
if(nextIndex >= totalCount) @%"+;D
return getStartIndex(); 3lh^maQ]
else M\m6|P
return nextIndex; ,a6Oi=+>/U
} ][D/=-
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publicint getPreviousIndex(){ (~k{aO
int previousIndex = getStartIndex() - ]h3{MTr/
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pageSize; $M:Ru@Du2
if(previousIndex < 0) :,8eM{.Q
return0; NzBX2
else [D$%LR X
return previousIndex; n0
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} b^s>yN
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} cXDG(.!n7B
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抽象业务类 zZE@:P&lf
java代码: C@F3iwTtp
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/** (?ofL|Cg(
* Created on 2005-7-12 e$Npo<u
*/ vyhxS .[9
package com.javaeye.common.business; 9{-
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import java.io.Serializable; mo*ClU7
import java.util.List; +)<H,?/
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import org.hibernate.Criteria; _mG>^QI.
import org.hibernate.HibernateException; 1)N~0)dO
import org.hibernate.Session; p=jIDM'
import org.hibernate.criterion.DetachedCriteria; $T2n^yz
import org.hibernate.criterion.Projections; `21$e
import 2;`F`}BA
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org.springframework.orm.hibernate3.HibernateCallback; y%Wbm&h
import
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org.springframework.orm.hibernate3.support.HibernateDaoS nq,P.~l
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upport; wM0P#+bA\
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import com.javaeye.common.util.PaginationSupport; r>kDRIHB
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public abstract class AbstractManager extends IzWS6!zKU
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HibernateDaoSupport { LVAnZ'h/|
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privateboolean cacheQueries = false; N1l&$#Fr!s
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privateString queryCacheRegion; $g @-WNe
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publicvoid setCacheQueries(boolean "v[?`<53^l
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cacheQueries){ r4wnfy
this.cacheQueries = cacheQueries; 1 GB
} \EC7*a0
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publicvoid setQueryCacheRegion(String mEVne.D
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queryCacheRegion){ R)u ${
this.queryCacheRegion = >=!$(JgX
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queryCacheRegion; 3`^NaQ
} zrazFI0G
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publicvoid save(finalObject entity){ se^(1R k
getHibernateTemplate().save(entity); +jrMvk"
} m
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publicvoid persist(finalObject entity){ jb
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getHibernateTemplate().save(entity); 6u-aV
} YThFskR oO
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publicvoid update(finalObject entity){ 1z5\>F
getHibernateTemplate().update(entity); Yv7`5b{N.
} 3^%sz!jK+
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publicvoid delete(finalObject entity){ )WR*8659e
getHibernateTemplate().delete(entity); {WYmO1
} c:f++||
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publicObject load(finalClass entity, ?[~)D}] j
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finalSerializable id){ N \Wd0b
return getHibernateTemplate().load W*D].|
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(entity, id); B9Z=`c.T
} ckg8x&Z
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publicObject get(finalClass entity, ;x~[om21;
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finalSerializable id){ \&)k{P>=
return getHibernateTemplate().get V9r58hbVT
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(entity, id);
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} BH$+{rZ8t
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publicList findAll(finalClass entity){ j"Vb8}
return getHibernateTemplate().find("from 9CW8l0
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" + entity.getName()); ;rJ
} 9X[}ik0
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publicList findByNamedQuery(finalString _Sxp|{H0
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namedQuery){ ~!G&K`u
return getHibernateTemplate $h|rd+},
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().findByNamedQuery(namedQuery); TR([u
} JHCV7$RS
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publicList findByNamedQuery(finalString query, B>TI dQ
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finalObject parameter){ &ivPY
return getHibernateTemplate }bxx]rDl
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().findByNamedQuery(query, parameter); bAl0z)p
} GP/Gv
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publicList findByNamedQuery(finalString query, av*M#
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finalObject[] parameters){ 0XNj!^&
return getHibernateTemplate iTq~^9G
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().findByNamedQuery(query, parameters); )xMP
} 8;r7ksE~
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publicList find(finalString query){ >5|;8v-r
return getHibernateTemplate().find RZ:i60
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(query); rH<iUiA?O
} $CYB&|d
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publicList find(finalString query, finalObject [@_zsz,`L
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parameter){ c*"TmDY
return getHibernateTemplate().find b@&ydgmaQ
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(query, parameter); 2\,vq
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} 5E#koy7
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public PaginationSupport findPageByCriteria tR]1c
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(final DetachedCriteria detachedCriteria){ B?xu!B,
return findPageByCriteria ZoiCdXvTN
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(detachedCriteria, PaginationSupport.PAGESIZE, 0);
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} W]v[Xm$q
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public PaginationSupport findPageByCriteria pSq3\#Twr
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(final DetachedCriteria detachedCriteria, finalint [@qUQ,Ie
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startIndex){ Ye8&cZ*.
return findPageByCriteria sDH|k@K
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(detachedCriteria, PaginationSupport.PAGESIZE, L/.$0@$bv
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startIndex); L|3wGY9E
} t:
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public PaginationSupport findPageByCriteria #6tb{ws3
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(final DetachedCriteria detachedCriteria, finalint \c! LC4pE
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pageSize, \sIRV}Tk}N
finalint startIndex){ Cz\(.MWNZ
return(PaginationSupport) [Q/')5b
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getHibernateTemplate().execute(new HibernateCallback(){ oK GF Dl]3
publicObject doInHibernate p,=:Ff}~
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(Session session)throws HibernateException { $rySz7NI
Criteria criteria = ^;2dZgJ4^
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detachedCriteria.getExecutableCriteria(session); X^#.4:>.
int totalCount = $FgpFxz;
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((Integer) criteria.setProjection(Projections.rowCount }[u 9vZL
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()).uniqueResult()).intValue(); !Cj1:P
criteria.setProjection !P, 9Sg&5)
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(null); _[SP*"
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List items = >a]4}
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criteria.setFirstResult(startIndex).setMaxResults g#V3u=I8~
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(pageSize).list(); b&g9A{t
PaginationSupport ps = $
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new PaginationSupport(items, totalCount, pageSize, )>ed6A1
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startIndex); HRx%m1H
return ps; BEM+FG
} 'nNw
}, true); Y.?|[x0Wh
} XHO}(!l\
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public List findAllByCriteria(final hnM|=[wM
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DetachedCriteria detachedCriteria){ oy'Q#!
return(List) getHibernateTemplate $}S5&
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().execute(new HibernateCallback(){ kRgyvA,*;
publicObject doInHibernate {sy#&m(el
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(Session session)throws HibernateException { Uq/(xh,t5
Criteria criteria = 4];Qpln
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detachedCriteria.getExecutableCriteria(session); Y9m'RFZr
return criteria.list(); {=7W;uL
} HLAYmXX"w
}, true); #kX=$Bzk
} joifIp_
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public int getCountByCriteria(final xZS
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DetachedCriteria detachedCriteria){ Yuze9b\[
Integer count = (Integer) pF.Ws,nQ5
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getHibernateTemplate().execute(new HibernateCallback(){ F5%-6@=
publicObject doInHibernate 3vOI=ar=L~
{R[lsdH(X
(Session session)throws HibernateException { 0-g,C=L
Criteria criteria = ?M7nbfy[A@
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detachedCriteria.getExecutableCriteria(session); "8Pxf=
return `NV =2T
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criteria.setProjection(Projections.rowCount LaJc;Jt$
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()).uniqueResult(); y]?%2ud/ =
} 9L?EhDcDV
}, true); i,ku91T
return count.intValue(); Yh:*.@
} M!=v"C#
} quf,ZK5
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用户在web层构造查询条件detachedCriteria,和可选的 F& H~JJ
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 itD1r?O{pV
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PaginationSupport的实例ps。 n=t%,[Op
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ps.getItems()得到已分页好的结果集 *ARro
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ps.getIndexes()得到分页索引的数组 U*k$pp6\b~
ps.getTotalCount()得到总结果数 hS
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ps.getStartIndex()当前分页索引 4cJ7.Pez
ps.getNextIndex()下一页索引 VQ<Z`5eV
ps.getPreviousIndex()上一页索引
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Dw[w%uz
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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 V85a{OBm,8
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一下代码重构了。 7"*-
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我把原本我的做法也提供出来供大家讨论吧: ,X\z#B
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首先,为了实现分页查询,我封装了一个Page类: MkJL9eG
java代码: N3r{|Bu
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/*Created on 2005-4-14*/ #)>>f
package org.flyware.util.page; <