Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 d",(aZ
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 y7z( &M@
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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 @4drjT
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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 DtWx r
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分页支持类: $W&:(&
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java代码: t<63 8`{kk
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package com.javaeye.common.util; D`pQ7
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import java.util.List; jvHFFSK
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publicclass PaginationSupport { o0ZBi|U\4
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publicfinalstaticint PAGESIZE = 30; XA<ozq'
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privateint pageSize = PAGESIZE; 0C$8g
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privateList items; #G#g|x*V
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privateint totalCount; l%~lz[
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privateint[] indexes = newint[0]; yK1ie
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privateint startIndex = 0; nPFwPk8=M
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public PaginationSupport(List items, int pu9^e4B9
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totalCount){ WC*=rWRxF
setPageSize(PAGESIZE); rrqQCn9
setTotalCount(totalCount); gEwd &J
setItems(items); *geN[[
setStartIndex(0);
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} ST
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public PaginationSupport(List items, int V`#.7uUP
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totalCount, int startIndex){ 8 #}D
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setPageSize(PAGESIZE); %}3qR~;
setTotalCount(totalCount); 8(f:U@BS
setItems(items); 6>`c1
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setStartIndex(startIndex); +G*JrwJ&=
} c_.-b=zm
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public PaginationSupport(List items, int mwC=o5O
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totalCount, int pageSize, int startIndex){ ]<XR]FHx)
setPageSize(pageSize); v^N`IJq
setTotalCount(totalCount); ~"K,7sw!Y
setItems(items); O
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setStartIndex(startIndex); MS3=~*+
} "OmD@
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publicList getItems(){ uO6{r v\
return items; YKZa$@fA?
} @1-F^G%p8
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publicvoid setItems(List items){ 3jZ6kfj
this.items = items; Y32 "N[yw
} R=]d%L8
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publicint getPageSize(){ u92^(|
return pageSize; xSMt*]=9
} 5/MKzoB
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publicvoid setPageSize(int pageSize){ ^oM|<";!?D
this.pageSize = pageSize; 9'[ N1Un.=
} X4|4QgY
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publicint getTotalCount(){ r(h`XMsU
return totalCount; %NHkDa!
}
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publicvoid setTotalCount(int totalCount){ O+vS|
if(totalCount > 0){ E"~2./+rd
this.totalCount = totalCount; /Ncm^b4
int count = totalCount / CW&.NT
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pageSize; 47K1$3P
if(totalCount % pageSize > 0) tDg}Ys=4K>
count++; R?o$Y6}5
indexes = newint[count]; nkfZiyx
for(int i = 0; i < count; i++){ @p 6<Lw_E
indexes = pageSize * kM8{Cw
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} #_93f
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}else{ G<|8?6bq#
this.totalCount = 0; @#g<IBG=*
} 2-N 'ya
} 4JGtI*%5lq
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publicint[] getIndexes(){ Z;/$niY
return indexes; "pP^*9FrA
} \%]I{
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publicvoid setIndexes(int[] indexes){ @a:>$t
this.indexes = indexes; wMqX)}>
} \R36w^c3
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publicint getStartIndex(){ j)C,%Ol
return startIndex; l
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} hCjR&ZA
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publicvoid setStartIndex(int startIndex){ &|3
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if(totalCount <= 0) scLn=
this.startIndex = 0; fC,:{}
elseif(startIndex >= totalCount) ojvj}ln
this.startIndex = indexes '(bgs
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[indexes.length - 1]; (3J$>Na
elseif(startIndex < 0) Szbb_i{_
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this.startIndex = 0; }J">}j]/
else{ Qham^
this.startIndex = indexes +t5U.No
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[startIndex / pageSize]; l&iq5}[n&
} s7Ub@
} n8*;lK8
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publicint getNextIndex(){ h3LE>}6D
int nextIndex = getStartIndex() + /x_o!<M
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pageSize; ={K`4BD
if(nextIndex >= totalCount) V-<GT?
return getStartIndex(); 1%4sHSN
else 5?hw !
return nextIndex; sl]_M
} R"
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publicint getPreviousIndex(){ T!Hb{Cg*
int previousIndex = getStartIndex() - Og,$ sH}`
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pageSize; L#E]
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if(previousIndex < 0) bFe+m1Q_
return0; _?OW0x4
else r E}%KsZ
return previousIndex; Jn{OWw2
} .C 8PitS
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} *h}XWB C1q
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抽象业务类 b0lq\9
java代码: cWoPB
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/** 0NS<?p~_S
* Created on 2005-7-12 /YZr~|65
*/ xlhG,bb7
package com.javaeye.common.business; -$\+'
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import java.io.Serializable; ^J$2?!~
import java.util.List; KXx32 b,~
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import org.hibernate.Criteria; mV3cp rRqv
import org.hibernate.HibernateException; 9I6a"PGDb
import org.hibernate.Session; V5UF3'3;}
import org.hibernate.criterion.DetachedCriteria; 0u;4%}pD
import org.hibernate.criterion.Projections; 9I&xfvD,
import nih0t^m'
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org.springframework.orm.hibernate3.HibernateCallback; 7Zlw^'q$:L
import M7pOLP_1jB
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org.springframework.orm.hibernate3.support.HibernateDaoS |S_eDjF
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upport; ~ _/(t'9
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import com.javaeye.common.util.PaginationSupport; 7pe\M/kl
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public abstract class AbstractManager extends A"L&a
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HibernateDaoSupport { Yt;MV)
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privateboolean cacheQueries = false; ML|FQ
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privateString queryCacheRegion; RW<D<5C
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publicvoid setCacheQueries(boolean Y$"O
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cacheQueries){ ?l9XAWt\
this.cacheQueries = cacheQueries; D]zwl@sRX:
} 8X[:j&@
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publicvoid setQueryCacheRegion(String 5>[u `
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queryCacheRegion){ ~"nxE
this.queryCacheRegion = .+$Q<L
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queryCacheRegion; PvPOU"
} 3}}38A|4
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publicvoid save(finalObject entity){ )Y"+,$$>Y`
getHibernateTemplate().save(entity); }\B><E{G
} ;ub;lh 3
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publicvoid persist(finalObject entity){ *\
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getHibernateTemplate().save(entity); c2l@6<Ww
} H?yK~bGQ
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publicvoid update(finalObject entity){ bCRV\myd`
getHibernateTemplate().update(entity); H\ F:95
} ekWD5,G
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publicvoid delete(finalObject entity){ TM%|'^)
getHibernateTemplate().delete(entity); j eoz*Dz
} ]d$8f
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publicObject load(finalClass entity, y0L_"e/
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finalSerializable id){ =^M/{51j
return getHibernateTemplate().load 11Q1AN
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(entity, id); XO.jl" xu
} xQ7l~O
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publicObject get(finalClass entity, f,U.7E
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finalSerializable id){ {'7B6
return getHibernateTemplate().get b/+u4'"
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(entity, id); g];!&R-
} W=~~5jFX
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publicList findAll(finalClass entity){ hNC&T`.-~B
return getHibernateTemplate().find("from %z=le7
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" + entity.getName()); lU8l}Ndz"
} 7`*h2 mgY
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publicList findByNamedQuery(finalString j`{?OYD
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namedQuery){ E^B'4
return getHibernateTemplate /:cd\A}
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().findByNamedQuery(namedQuery); )v'WWwXY>
} tHU 2/V:R
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publicList findByNamedQuery(finalString query, /J]5H
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finalObject parameter){ W_JlOc!y
return getHibernateTemplate * `JYC
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().findByNamedQuery(query, parameter); +Q/R{#O
} %Tfbsyf%f
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publicList findByNamedQuery(finalString query, esJ~;~[@(r
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finalObject[] parameters){ ,V7nzhA2
return getHibernateTemplate Z3Og=XHR
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().findByNamedQuery(query, parameters); &5>Kl}7
} QFA8N
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publicList find(finalString query){ &j;wCvE4+
return getHibernateTemplate().find |44Ploz2b
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(query); R7%#U`Q^A
} +V2F#fI/
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publicList find(finalString query, finalObject (|2t#'m
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parameter){ t^&Cxh
return getHibernateTemplate().find [:dY0r+
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(query, parameter); G0Iw-vf
} )Om*@;r(
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public PaginationSupport findPageByCriteria -oGdk|Yn
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(final DetachedCriteria detachedCriteria){ Zj(AJ* r
return findPageByCriteria X;$+,&M"
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 5%"V[lDx@
} F~-(:7j
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public PaginationSupport findPageByCriteria /l3V3B7
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(final DetachedCriteria detachedCriteria, finalint Y/F6\oh
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startIndex){ I^.Om])
return findPageByCriteria Zpt\p7WQ
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(detachedCriteria, PaginationSupport.PAGESIZE, ~g91Pr
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startIndex); p%ki>p )E|
} gt)I(
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public PaginationSupport findPageByCriteria 8]c2r%J
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(final DetachedCriteria detachedCriteria, finalint 1C+13LE$U
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pageSize, 2DA]i5
finalint startIndex){ 3Tcms/n
return(PaginationSupport) Da*?x8sSL
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getHibernateTemplate().execute(new HibernateCallback(){ \
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publicObject doInHibernate +Ze}B*0
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(Session session)throws HibernateException { =IZT(8
Criteria criteria = ,)cM3nu
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detachedCriteria.getExecutableCriteria(session); %uDi#x.
int totalCount = gT.sjd
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((Integer) criteria.setProjection(Projections.rowCount >>r(/81S
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()).uniqueResult()).intValue(); u,ho7ht3(
criteria.setProjection WCZjXDiwJ
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(null); B`)BZ,#p
List items = |d2SIyUc
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criteria.setFirstResult(startIndex).setMaxResults DeVv4D:}@
/8'NG6"H`
(pageSize).list(); K8|r&`X0
PaginationSupport ps = q>_.[+6
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new PaginationSupport(items, totalCount, pageSize, 6_o*y8s.
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startIndex); s[>,X#7 y
return ps; mthA4sz
} n&4N[Qlv,
}, true); CZwXTHe
} XX TL..
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public List findAllByCriteria(final #lo6c;*m5
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DetachedCriteria detachedCriteria){ Y1\ }5k{>
return(List) getHibernateTemplate `,(4]tlL
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().execute(new HibernateCallback(){ #P9~}JB3,
publicObject doInHibernate )u&|_&g{}J
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(Session session)throws HibernateException { F~vuM$+d
Criteria criteria = R_cA:3qc~
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detachedCriteria.getExecutableCriteria(session); AR%4D3Dma
return criteria.list(); Tk[ $5u*,
} !PlEO 2at
}, true); Dj?> <@
} [85spub&}
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public int getCountByCriteria(final e2Pcm_Ahv*
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DetachedCriteria detachedCriteria){ .hb:s,0mP
Integer count = (Integer) 5V~oIL
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getHibernateTemplate().execute(new HibernateCallback(){ Qy<P463A(l
publicObject doInHibernate wU36sCo
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(Session session)throws HibernateException { BwEN~2u6
Criteria criteria = _.Nbt(mz
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detachedCriteria.getExecutableCriteria(session); wWP}C D
return &|1<v<I5
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criteria.setProjection(Projections.rowCount -7[@R;FS
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()).uniqueResult(); J4C.+![!Ah
} W(Fv
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}, true); ^)S;xb9
return count.intValue(); Rok7n1gW
} UgSB>V<?
} O63<AY@
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用户在web层构造查询条件detachedCriteria,和可选的 {lDd.Fn
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 XEp{VC@=
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PaginationSupport的实例ps。 oulVg];
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ps.getItems()得到已分页好的结果集 DJ k/{Z:
ps.getIndexes()得到分页索引的数组 P )"m0Lu<
ps.getTotalCount()得到总结果数 nNV'O(x}
ps.getStartIndex()当前分页索引 =:Fc;n>c<K
ps.getNextIndex()下一页索引 Fnv;^}\z
ps.getPreviousIndex()上一页索引 }eU*(
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ]@c+]{
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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
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一下代码重构了。 jXx<`I+]
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我把原本我的做法也提供出来供大家讨论吧: F#Ryu~,"
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首先,为了实现分页查询,我封装了一个Page类: {X+3;&