Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 8*yhx
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Ym
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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 g}nlb.b]{m
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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 xKIzEN
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分页支持类: tpp. 9
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java代码: 3n-~+2l
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package com.javaeye.common.util; 3}{od$3G
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import java.util.List; R<aF;Rvb5
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publicclass PaginationSupport { Iqe=)
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publicfinalstaticint PAGESIZE = 30; ZaYux-0]kF
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privateint pageSize = PAGESIZE; I_66q7U"0
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privateList items; M]PH1 2Ob
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privateint totalCount; Ng=XH"ce~
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privateint[] indexes = newint[0]; #T_m|LN7
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privateint startIndex = 0; .: ~);9kj
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public PaginationSupport(List items, int GZgu1YR
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totalCount){ D0Cs
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setPageSize(PAGESIZE); {,z$*nf
setTotalCount(totalCount); 3dm lP2
setItems(items); ;`<uo$R
setStartIndex(0); ir^%9amh
} g_8Bhe"ik
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public PaginationSupport(List items, int 8nn%wps
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totalCount, int startIndex){ tNf?pV77
setPageSize(PAGESIZE); f
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setTotalCount(totalCount); >D20f<w(H
setItems(items); $|~YXH~O
setStartIndex(startIndex); f?)BAah
} ?`R;ZT)U-
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public PaginationSupport(List items, int 3D<s#
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totalCount, int pageSize, int startIndex){ 3Z.<=D
setPageSize(pageSize); &K
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setTotalCount(totalCount); *h59Vaoc
setItems(items); {=n-S2%
setStartIndex(startIndex); ;OjxEXaq
} x>MrB
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publicList getItems(){ bs{i@1$
return items; !ER,o_T<
} nlv8HC
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publicvoid setItems(List items){ n^Co
this.items = items; uA#uq^3
} :ryyo$
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publicint getPageSize(){ CjW`cHd
return pageSize; LU$aCw5 B;
} AWkXWl}
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publicvoid setPageSize(int pageSize){ Jo%5 NXts4
this.pageSize = pageSize; .~J}80a/
} dUAZDoLi
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publicint getTotalCount(){ $Pw@EC]
return totalCount; t
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} K/)*P4C-
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publicvoid setTotalCount(int totalCount){ C(o]3):?
if(totalCount > 0){ Zx&gr|)}
this.totalCount = totalCount; 0K/?8[#
int count = totalCount / alu3CE
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pageSize; %6-5hBzZN
if(totalCount % pageSize > 0) u#TRm?s
count++; "VEA71
indexes = newint[count]; d4'*K1m
for(int i = 0; i < count; i++){ Gwl]sMJ
indexes = pageSize * /F#_~9JXG
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} tu.Tvtudzj
}else{ p'#
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this.totalCount = 0; X~ca8!Dq
} 3=r#=u5z
} 4dv5
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publicint[] getIndexes(){ $nX4!X
return indexes; $F>
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publicvoid setIndexes(int[] indexes){ ]xJ5}/
this.indexes = indexes; :)/%*<vq,
} ~hYTs
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publicint getStartIndex(){ mc{gcZIm
return startIndex; aI8k:FK"
} vAeh#V~#
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publicvoid setStartIndex(int startIndex){ RPH]@
if(totalCount <= 0) Ps<6 kQ(
this.startIndex = 0; !Db0r/_:G
elseif(startIndex >= totalCount) P(H,_7 4
this.startIndex = indexes pVuJ4+`
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[indexes.length - 1]; p.Y
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elseif(startIndex < 0) p1zT]
this.startIndex = 0; GtYtB2U
else{ AGxtmBB;
this.startIndex = indexes Y\CR*om!W
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[startIndex / pageSize]; RL0#WBR
} 014p = W
} *{3&?pxx
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publicint getNextIndex(){ ] qT\z<}
int nextIndex = getStartIndex() + N#C"@,}Y
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pageSize; -K+" :kiS
if(nextIndex >= totalCount) eh`s fH
return getStartIndex(); @y)'h]d
else r3 OTU$t?
return nextIndex; 'g3!SdaLF
} -c%K_2`
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publicint getPreviousIndex(){ v=-8} S
int previousIndex = getStartIndex() - |~QHCg<
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pageSize; #Y)Gos
if(previousIndex < 0) Z^Y_+)=s
return0; 4';~@IBf
else v
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return previousIndex; S4n ~wo
} %}t<,ex(yO
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} f7y a0%N
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抽象业务类 >Ln/ )j
java代码: I/whpOg
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/** E=Z;T
* Created on 2005-7-12 Vl91I+Ev
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package com.javaeye.common.business; ROWb:tX}
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import java.io.Serializable; $UgQ1Qc
import java.util.List; 2(_+PQ6C=
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import org.hibernate.Criteria; ^|h5*Tb
import org.hibernate.HibernateException; )3W`>7>
import org.hibernate.Session; XiP xg[;
import org.hibernate.criterion.DetachedCriteria; ]h]| PdN
import org.hibernate.criterion.Projections; fSe$w#*I
import /}%$fB
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org.springframework.orm.hibernate3.HibernateCallback; *'b3Z3c,;
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org.springframework.orm.hibernate3.support.HibernateDaoS }N^A
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import com.javaeye.common.util.PaginationSupport; Gp0B^^H$
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public abstract class AbstractManager extends AKKp-I5
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HibernateDaoSupport { ^jY'Hj.Bs
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privateboolean cacheQueries = false; oCl
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privateString queryCacheRegion; c ilo8x`
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publicvoid setCacheQueries(boolean xJ/<G$LNJ0
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cacheQueries){ WtT*
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this.cacheQueries = cacheQueries; z>\vYR$
} "OIra2O
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publicvoid setQueryCacheRegion(String R)p+#F(s
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queryCacheRegion){ yuTSzl25,/
this.queryCacheRegion = f)~j'e
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queryCacheRegion; QD<GXPu?N
} `k ^d)9
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publicvoid save(finalObject entity){ DEdJH4
getHibernateTemplate().save(entity); J}$St|1y
} )<fa1Gz#^
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publicvoid persist(finalObject entity){ |.OXe!uU41
getHibernateTemplate().save(entity); v)^8e0vx
} \!+sL JP
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publicvoid update(finalObject entity){ .3yoDab
getHibernateTemplate().update(entity); Y|*a,H"_
} COV8=E~
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publicvoid delete(finalObject entity){ 5Op|="W.
getHibernateTemplate().delete(entity); OKXELP
} 3Pj#k|(f[0
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publicObject load(finalClass entity, -E*VF{IG1
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finalSerializable id){ w=dTa5
return getHibernateTemplate().load ,YEwz3$5u
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(entity, id); s)gU vS\
} *0EB{T1
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publicObject get(finalClass entity, j %3wD2 l
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finalSerializable id){ P(n_eIF-f
return getHibernateTemplate().get OMl<=;^:|
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(entity, id); 3lkz:]SsE
} 5$Q}Zxh
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publicList findAll(finalClass entity){ "@P)
return getHibernateTemplate().find("from m1d*Lt>F@
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" + entity.getName()); E41ay:duAl
} n86=1G:%
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publicList findByNamedQuery(finalString a9+l:c@
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namedQuery){ v;%>F)I
return getHibernateTemplate )z:"P;b"Nl
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().findByNamedQuery(namedQuery); ,Q7W))j
} Ct8}jg"
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publicList findByNamedQuery(finalString query, ><l|&&e-
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finalObject parameter){ sQIzcnKB
return getHibernateTemplate Vo G`@^s
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().findByNamedQuery(query, parameter); sI&|qK-(
} \$Jz26
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publicList findByNamedQuery(finalString query, %^zGM^PD
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finalObject[] parameters){ O/N
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return getHibernateTemplate Q5kf-~Jx+
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().findByNamedQuery(query, parameters); $,s"c(pv[,
} PQ}owEJ2eM
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publicList find(finalString query){ OYbgt4
return getHibernateTemplate().find r_p4pxs
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(query); U?WS\Jji3!
} %UO ;!&K
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publicList find(finalString query, finalObject dPVl\<L1
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parameter){
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return getHibernateTemplate().find E
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(query, parameter); lk(q>dv K
} Z%_m<Nf8T
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public PaginationSupport findPageByCriteria -9X#+-
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(final DetachedCriteria detachedCriteria){ 8-"lK7
return findPageByCriteria 1OwVb
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ~HM,@5dFC
} 6u6,9VG,
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public PaginationSupport findPageByCriteria W "}Cfv
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(final DetachedCriteria detachedCriteria, finalint &Bc$8ZR
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startIndex){ T \"eqa
return findPageByCriteria 0|L%)'F
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(detachedCriteria, PaginationSupport.PAGESIZE, c]OK)i-{l
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startIndex); Wh7}G
} Y}aaW[
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public PaginationSupport findPageByCriteria `#Yv(a2TY
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(final DetachedCriteria detachedCriteria, finalint v;_k*y[VV$
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pageSize, 0CtPq`!
finalint startIndex){ \-2O&v'}
return(PaginationSupport) k O8W>
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getHibernateTemplate().execute(new HibernateCallback(){ 'v42Q J"{
publicObject doInHibernate tl@n}
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(Session session)throws HibernateException { \0'0)@uziQ
Criteria criteria = | GqKa
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detachedCriteria.getExecutableCriteria(session); xBevf&tP
int totalCount = /z(;1$Ld6{
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((Integer) criteria.setProjection(Projections.rowCount D(YNa
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()).uniqueResult()).intValue(); 4^>FN"Ve`B
criteria.setProjection 7c7:B2Lq
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(null); IFd2r;W8
List items = F2bAo 6~R
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criteria.setFirstResult(startIndex).setMaxResults 'U%L\v,
)V6<'>1WZ
(pageSize).list(); #1#?k
PaginationSupport ps = p> #QFd"m
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new PaginationSupport(items, totalCount, pageSize, x_eR/B>
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startIndex); &|j^?ro6
return ps; tXu_o6]
} -sqoE*K[8
}, true); UwQyAD]Ht
} jykY8;4
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public List findAllByCriteria(final qE W3k),
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DetachedCriteria detachedCriteria){ y G{;kJ P
return(List) getHibernateTemplate 2dpTU=K4
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().execute(new HibernateCallback(){ kNnI$(H"H
publicObject doInHibernate Dg_AoC
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(Session session)throws HibernateException { iAWd
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Criteria criteria = __Tg1A
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detachedCriteria.getExecutableCriteria(session); _w\A=6=q|
return criteria.list(); a{deN9Qn
} '
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}, true); Kz`g Q |S
} 5[\LQtM
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public int getCountByCriteria(final nTd[-3o
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DetachedCriteria detachedCriteria){ #y4+O;{
Integer count = (Integer) b f2 B
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getHibernateTemplate().execute(new HibernateCallback(){ \as^z!<
publicObject doInHibernate 'GJ'Vli
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(Session session)throws HibernateException { fSL'+l3
Criteria criteria = 7yDWc m_y
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detachedCriteria.getExecutableCriteria(session); /GQN34RD
return ,%uK^U.zk
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criteria.setProjection(Projections.rowCount 61"w>;d6
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()).uniqueResult(); x6BO%1
} @9X+ BdQU
}, true); 'U8% !
return count.intValue(); O 6}eV^y
} 2&+Nr+P
} Z91GM1lrf8
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用户在web层构造查询条件detachedCriteria,和可选的 F#S)))#
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 2U
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PaginationSupport的实例ps。 0zCmU)ng
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ps.getItems()得到已分页好的结果集 TODTR7yGo
ps.getIndexes()得到分页索引的数组 m+ww
ps.getTotalCount()得到总结果数 bW e_<'N
ps.getStartIndex()当前分页索引 m\];.Da
ps.getNextIndex()下一页索引 ~t ` uq
ps.getPreviousIndex()上一页索引 -T0@b8
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 &~SPDiu.t
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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 \j$q';9p
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一下代码重构了。 TcP
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我把原本我的做法也提供出来供大家讨论吧: `BA,_N|6
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首先,为了实现分页查询,我封装了一个Page类: ;:/<