Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 L!;"73,&(8
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 f |%II,!3
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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 c!0u,6
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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 _ck)yY?7
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分页支持类: U1ZKJ<pv
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java代码: f`<elWgc"
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package com.javaeye.common.util; ~k"r
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import java.util.List; ^/~ZP?%]
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publicclass PaginationSupport { 0 i'bo*
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publicfinalstaticint PAGESIZE = 30; q\pI&B
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privateint pageSize = PAGESIZE; vmzc0J+3p
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privateList items; #Z. QMWq
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privateint totalCount; pKtN$Fd
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privateint[] indexes = newint[0]; `- HI)-A97
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privateint startIndex = 0; ,xw1B-dx
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public PaginationSupport(List items, int
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totalCount){ <Hf3AB;#4
setPageSize(PAGESIZE); G{.[o6>
setTotalCount(totalCount); Ct][B{
setItems(items); UY6aD~tD0
setStartIndex(0); 2U|"]tpM&
} f\;w(_
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public PaginationSupport(List items, int nR]*RIp5
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totalCount, int startIndex){ 1oc@]0n
setPageSize(PAGESIZE); J@o_-\@
setTotalCount(totalCount); \ 5.nr*5
setItems(items); )n6,uTlOw
setStartIndex(startIndex); u`CHM:<<?
} (#?O3z1@"
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public PaginationSupport(List items, int ;E_Go&Vd
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totalCount, int pageSize, int startIndex){ 9^u}~e
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setPageSize(pageSize); E~@&&dU8
setTotalCount(totalCount); '7Mz]@
setItems(items); Ze!/b|`xI
setStartIndex(startIndex); GrUpATIx
} P{LS +.
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publicList getItems(){ .-'_At4g
return items; NCdDG
} -%Rw2@vU
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publicvoid setItems(List items){ ZZw2m@T>
this.items = items; fH@cC`
} &OlX CxH
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publicint getPageSize(){ 1N_T/I8_F
return pageSize; O{7rIy
}
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publicvoid setPageSize(int pageSize){ 8BrC@L2E0
this.pageSize = pageSize; Egz6rRCvg
} 1Ys)b[:
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publicint getTotalCount(){ ;m7~!m)
return totalCount; ?0'e_s
} *LMzq9n3o
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publicvoid setTotalCount(int totalCount){ |$;4/cKfy
if(totalCount > 0){ _&(L{cFx6
this.totalCount = totalCount; T6b~uE
int count = totalCount / oxBTm|j7
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pageSize; T
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if(totalCount % pageSize > 0) ] g<$f#S
count++; ; GE6S{~-
indexes = newint[count]; dU*$V7
for(int i = 0; i < count; i++){ \!hd|j?&6
indexes = pageSize * -Bq]E,Xf)
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} A;5_/ 2
}else{ Hs$HeAp;
this.totalCount = 0; n*ROlCxV
} _u""v
} ,na}' A@a`
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publicint[] getIndexes(){ )3A+Ell`
return indexes; eIy:5/s
} C?k\5AzT
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publicvoid setIndexes(int[] indexes){ =`*@OJHH
this.indexes = indexes; >0[:uu,'>
} KwV!smi2
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publicint getStartIndex(){ <2oMk#Ng^
return startIndex; & kVa*O
} GGo~39G
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publicvoid setStartIndex(int startIndex){ H0 Zo.Np
if(totalCount <= 0) j D*<M/4
this.startIndex = 0; /NjBC[P
elseif(startIndex >= totalCount) C:t?HLY)fG
this.startIndex = indexes *|j4>W\J
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[indexes.length - 1]; 8KN3|)
elseif(startIndex < 0) H)h^|A/vO
this.startIndex = 0; 7x77s
else{ `\|@w@f|;
this.startIndex = indexes Nmd{C(^o
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[startIndex / pageSize]; q"@#FS
}
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} R!%HQA1U
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publicint getNextIndex(){ *iY:R
int nextIndex = getStartIndex() + 8(&6*-7=
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if(nextIndex >= totalCount) z R'EQ
return getStartIndex(); }ng?Ar[
else qdy(C^(fa
return nextIndex; u,nn\>Y
} ES!e/l
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publicint getPreviousIndex(){ `1n^~
int previousIndex = getStartIndex() - Qd\='*:!
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pageSize; ,;5%&T
if(previousIndex < 0) mn=b&{')e
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else Aqmw#X
return previousIndex; @;KYvDY
} <wb6)U.
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} SUIJ{!F/
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抽象业务类 0>Td4qr+u
java代码: N
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/** %'i_iF8.
* Created on 2005-7-12 Q\}-MiI/
*/ QcX\z\'vg
package com.javaeye.common.business; s3m\
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import java.io.Serializable; us ~cIGm
import java.util.List; rM,f7hm[S*
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import org.hibernate.Criteria; F!g1.49""
import org.hibernate.HibernateException; rNJU &
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import org.hibernate.Session; v0!|TI3s
import org.hibernate.criterion.DetachedCriteria; !hM`Oe`S
import org.hibernate.criterion.Projections; ;-JF b$m
import lwgwdB
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org.springframework.orm.hibernate3.HibernateCallback; ]\ !ka/%
import /*>}y$
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org.springframework.orm.hibernate3.support.HibernateDaoS Dq<DW2It>
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upport; vf@j d}?
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import com.javaeye.common.util.PaginationSupport; +jZa A/
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public abstract class AbstractManager extends -0<vmU
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HibernateDaoSupport { 8f[ztT0`g
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privateboolean cacheQueries = false; /YUW)?o!^N
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privateString queryCacheRegion; !4D?X\~"%
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publicvoid setCacheQueries(boolean . )+c01
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cacheQueries){ OI6Mx$
this.cacheQueries = cacheQueries; RQ[/s
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} RCYv 2=m>Q
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publicvoid setQueryCacheRegion(String 6;:D!},'c
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queryCacheRegion){ ZzgzeT+bv
this.queryCacheRegion = {DKZ~
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queryCacheRegion; \-]tvgA~&
} Rc{R^5B
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publicvoid save(finalObject entity){ GVA%iE.
getHibernateTemplate().save(entity); 1eV&oN#
} w'
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publicvoid persist(finalObject entity){ "=
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getHibernateTemplate().save(entity); 8rS;}Bt
} l3ogMRq@
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publicvoid update(finalObject entity){ u6?9#L(
getHibernateTemplate().update(entity); *S.FM.r
} 8@LWg d
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publicvoid delete(finalObject entity){ 6lg]5d2CD
getHibernateTemplate().delete(entity); n{MTh_C4n
} =^rp=
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publicObject load(finalClass entity,
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finalSerializable id){ )sdHJ
return getHibernateTemplate().load >KP,67
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(entity, id); o!~XYEXvUa
} '"\n,3h
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publicObject get(finalClass entity, elhP!"G
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finalSerializable id){ -N^Ah_9ek
return getHibernateTemplate().get KWjhkRK4]
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(entity, id); 7?uDh'utt
} ]g ;+7
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publicList findAll(finalClass entity){ XKZsX1=@R
return getHibernateTemplate().find("from ,q#SAZ/N
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" + entity.getName()); ~' 955fK>
} =`|BofR
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publicList findByNamedQuery(finalString J|^XD<Y
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namedQuery){ E:/!]sm!
return getHibernateTemplate ]nebL{}5
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().findByNamedQuery(namedQuery); v@GhwL
} -(WRhBpw
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publicList findByNamedQuery(finalString query, }PBL
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finalObject parameter){ ({C[RsY=6
return getHibernateTemplate p.8
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().findByNamedQuery(query, parameter); |y0k}ed
} tw<Oy^i
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publicList findByNamedQuery(finalString query, VK*`&D<P
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finalObject[] parameters){ c;"e&tW
return getHibernateTemplate KFO
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().findByNamedQuery(query, parameters); 9Xa.%vw>
} . 70=xH
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publicList find(finalString query){ 11#b%dT
return getHibernateTemplate().find Ut'T!RD
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(query); #&r}J
} /({oN1X>i
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publicList find(finalString query, finalObject _{#K
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parameter){ 6QT&{|q=
return getHibernateTemplate().find }ff^^7_
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(query, parameter); LVdR,'lS
} mejNa(D ^
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public PaginationSupport findPageByCriteria wL:7G
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(final DetachedCriteria detachedCriteria){ sxRKWM@4
return findPageByCriteria GJQ>VI2cY
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ]ke9ipj]:
} /8l@ndZf
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public PaginationSupport findPageByCriteria S!$S'{f<
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(final DetachedCriteria detachedCriteria, finalint (j@c946z""
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startIndex){ 5HHf3E [
return findPageByCriteria (=WYi~2v
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(detachedCriteria, PaginationSupport.PAGESIZE, YCb|eS^u
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startIndex); M1NdlAAf
} 6[R6P:v&'G
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public PaginationSupport findPageByCriteria J|
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(final DetachedCriteria detachedCriteria, finalint wM7Iu86
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pageSize, iQ2}*:Jc$
finalint startIndex){ Vfk"}k/do
return(PaginationSupport) J[Mj8ee#
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getHibernateTemplate().execute(new HibernateCallback(){ {t!
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publicObject doInHibernate c*zeO@AAn
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(Session session)throws HibernateException { K2n#;fY %
Criteria criteria = DQ/rx`BG
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detachedCriteria.getExecutableCriteria(session); 9__Q-J
int totalCount = p8-$MF]]6
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((Integer) criteria.setProjection(Projections.rowCount eE
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()).uniqueResult()).intValue(); EJ<L,QH3
criteria.setProjection 7\yh(+ kN
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(null); \zk>cQ
List items =
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criteria.setFirstResult(startIndex).setMaxResults L.-qTh^P
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(pageSize).list(); + 0*\q
PaginationSupport ps = (7!pc
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new PaginationSupport(items, totalCount, pageSize, 9SA %'
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startIndex); 3w p@OF_
return ps; q)C
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} zx:;0Z:S6>
}, true); H<ovIMd
}
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public List findAllByCriteria(final UfO='&U^
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DetachedCriteria detachedCriteria){ ARnq~E@1
return(List) getHibernateTemplate ^jS1g*nrN
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().execute(new HibernateCallback(){ Dt7z<1-)l
publicObject doInHibernate Lh-Y5(c
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(Session session)throws HibernateException { ]lyQ*gM
Criteria criteria = )
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detachedCriteria.getExecutableCriteria(session); 6nsb)7a
return criteria.list(); +.^pAz U}R
} 4)}>dxv
}, true); VFnxj52<
} C{t}q*fG
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public int getCountByCriteria(final G[>CBh5
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DetachedCriteria detachedCriteria){ P<[)
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Integer count = (Integer) @~7au9.V=X
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getHibernateTemplate().execute(new HibernateCallback(){ !
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publicObject doInHibernate 1\/vS$bi(
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(Session session)throws HibernateException { >Q"3dw
Criteria criteria = IS[q'Cv*
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detachedCriteria.getExecutableCriteria(session); g%^/^<ei
return x@O)QaBN!
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criteria.setProjection(Projections.rowCount ^jpQfD e6
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()).uniqueResult(); z$g__q-
} y!S:d
}, true); s{X+0_@Q
return count.intValue(); 4T$jY}U
} Dh#5-Kf%
} 4y5Q5)j
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用户在web层构造查询条件detachedCriteria,和可选的 9X#]Lg?b
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 L9,GUtK{
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PaginationSupport的实例ps。 r~,3
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ps.getItems()得到已分页好的结果集 -<T>paE9
ps.getIndexes()得到分页索引的数组 +Qzl-eN/+
ps.getTotalCount()得到总结果数 } 21!b :a
ps.getStartIndex()当前分页索引 cL#zE
ps.getNextIndex()下一页索引 OQg}E@LZ
ps.getPreviousIndex()上一页索引 /=#~8
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5OFB[
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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 /a-s9<
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一下代码重构了。 !T~uxeZ/;
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我把原本我的做法也提供出来供大家讨论吧: c5KciTD^
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首先,为了实现分页查询,我封装了一个Page类: Rf=-Q
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java代码: $|!3ks
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