Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 DppvUiQB!a
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 (%IstR|u:
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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 ]vyF&`phb
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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 u=i^F|
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分页支持类: g
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java代码: %+JTQy
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package com.javaeye.common.util; AhZ
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import java.util.List; Z#V\[
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publicclass PaginationSupport { }XE/5S}D
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publicfinalstaticint PAGESIZE = 30; {8Nd-WJ{
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privateint pageSize = PAGESIZE; c{P`oB8
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privateList items; ;rdLYmmx^
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privateint totalCount; 6$;)CO!h
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privateint[] indexes = newint[0]; r?>Hg+
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privateint startIndex = 0; /[T8/7;_l
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public PaginationSupport(List items, int #gT^hl5/
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totalCount){ R63d
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setPageSize(PAGESIZE);
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setTotalCount(totalCount); cO+`8`kv
setItems(items); 2|o$eq3t
setStartIndex(0); hfc!M2/w
} @Ec9Do>
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public PaginationSupport(List items, int daNIP1Qn
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totalCount, int startIndex){ Q1B!W
setPageSize(PAGESIZE); |0 %UM}
setTotalCount(totalCount); Jxp'.oo[
setItems(items); nuA!Jln_
setStartIndex(startIndex); J#WPXE+Ds
} Kf5 p*AI
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public PaginationSupport(List items, int wfzb:Aig`
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totalCount, int pageSize, int startIndex){ sVnuSm
setPageSize(pageSize); 0g)mf6}o
setTotalCount(totalCount); g?M69~G$:x
setItems(items); #| Po&yu4R
setStartIndex(startIndex); +rX,Sl`/
} U#4W"1~iX
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publicList getItems(){ ".Ug
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return items; 0:8'Ov(
} FX 3[U+
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publicvoid setItems(List items){ K;lC#
this.items = items; }y/t~f+
} GTvb^+6
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publicint getPageSize(){ !*-cf$
return pageSize; :gtwvM7/B
} R[t[M}q
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publicvoid setPageSize(int pageSize){ V [>5
this.pageSize = pageSize; RwKN
} >o7k%T|l$
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publicint getTotalCount(){ )9->]U@
return totalCount; de=T7,G#
} LlqhZetS
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publicvoid setTotalCount(int totalCount){ p}uw-$O
if(totalCount > 0){ aQ.
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this.totalCount = totalCount; ^"- 2fJ
int count = totalCount / ma~`&\xE
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pageSize; H[Cn@XE
if(totalCount % pageSize > 0) ^Pwq`G A
count++; VGIc|Q=F
indexes = newint[count]; >MH@FnUL
for(int i = 0; i < count; i++){ VPbNLi
indexes = pageSize * 2XpGgG`2`C
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} bcf OpA
}else{ ]CYe=m1<2Q
this.totalCount = 0; /[M~##%:
} Rz]bCiD3
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} -9EbU7>!
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publicint[] getIndexes(){ UHWunI S
return indexes; F Te# @\I
} =t2epIr5
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publicvoid setIndexes(int[] indexes){ E~ kmU{D
this.indexes = indexes; G
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} k6\c^%x
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publicint getStartIndex(){ WYL.J5O
return startIndex; 3#unh`3b
} COafVlJ,l
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publicvoid setStartIndex(int startIndex){ [<hiOB
if(totalCount <= 0) ^M"g5+q
this.startIndex = 0; RP$A"<goP
elseif(startIndex >= totalCount) ,*30Q
this.startIndex = indexes H2} i .
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[indexes.length - 1]; <U*d
elseif(startIndex < 0) 8z&9
this.startIndex = 0; QPnc "!
else{ o^D{WH\p
this.startIndex = indexes UpbzH(?#
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[startIndex / pageSize]; | Z;Av%%
} "P~>AXcq
} CAO$Zt
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publicint getNextIndex(){ 6._):[_2
int nextIndex = getStartIndex() + IkkrnG8
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pageSize; <Bwu N,}
if(nextIndex >= totalCount) xS'So7: h
return getStartIndex(); ?zEgN!\R)
else =0S7tNut
return nextIndex; \c)XN<HH
} p%BO:%v
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publicint getPreviousIndex(){ xUYSD
int previousIndex = getStartIndex() - 0#G"{M
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pageSize; k6XO-a f
if(previousIndex < 0) a%kj)ah
return0; !jm
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else G>b1No3%k
return previousIndex; UOyP6ej
} U4gZW]F
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} `?:'_Ki
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抽象业务类 :}lE@Y,R
java代码: q:(K^
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/**
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* Created on 2005-7-12 1{*x+GC^/
*/ Cfi5r|S
package com.javaeye.common.business; u[% #/
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import java.io.Serializable; pP .
import java.util.List; *UTk. :G5
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import org.hibernate.Criteria; cWi2Sls
import org.hibernate.HibernateException; mEA w^
import org.hibernate.Session; uQDu<@5^[
import org.hibernate.criterion.DetachedCriteria; 2:]Sy4K{
import org.hibernate.criterion.Projections; 0o#lB^e;l
import 5v]xk?Eb
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org.springframework.orm.hibernate3.HibernateCallback; q+ .=f.+Z
import V1+IqOXAIp
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org.springframework.orm.hibernate3.support.HibernateDaoS '{|87kI
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upport; wz ,woF|
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import com.javaeye.common.util.PaginationSupport; ~=71){4A
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public abstract class AbstractManager extends o,d:{tt
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HibernateDaoSupport { W uQdz&s>
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privateboolean cacheQueries = false; >+1bTt/-F
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privateString queryCacheRegion; x@/!H<y
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publicvoid setCacheQueries(boolean tIg_cY_y
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cacheQueries){ Zy<0'k%U
this.cacheQueries = cacheQueries; $h2h&6mH
} !({[^[!
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publicvoid setQueryCacheRegion(String aW"BN 5eM>
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queryCacheRegion){ GK)hK-
this.queryCacheRegion = *2 [r?!
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queryCacheRegion; Q<M>+U;t
} u}pLO9V"`
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publicvoid save(finalObject entity){ (|WqOwmoUt
getHibernateTemplate().save(entity); 8.vD]hO
} myPo&"_ x
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publicvoid persist(finalObject entity){ J^u{7K,
getHibernateTemplate().save(entity); v"^G9u
} [ [Z*n/tr
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publicvoid update(finalObject entity){ J~~WV<6
getHibernateTemplate().update(entity); Alrk3I3{
} zfS`@{;F`|
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publicvoid delete(finalObject entity){ ,i'>+Ix<
getHibernateTemplate().delete(entity); ?O28Q DUI
} |d{4_o90
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publicObject load(finalClass entity, VlKWWQj
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finalSerializable id){ &n['#7 <(!
return getHibernateTemplate().load WXJ%bH
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(entity, id); vzfWPjpKW
} l{kum2DT
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publicObject get(finalClass entity, Obbjl@]
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finalSerializable id){ 0PZpE
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return getHibernateTemplate().get At"@`1n_u'
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(entity, id); }e1f kjWk
} 59GS:
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publicList findAll(finalClass entity){ =ove#3
return getHibernateTemplate().find("from &)1+WrU
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" + entity.getName()); @<h@d_8^k
} H>2)R7h
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publicList findByNamedQuery(finalString >]FRHJo_
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namedQuery){ <&B)i\j8=b
return getHibernateTemplate G/b
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().findByNamedQuery(namedQuery); '?4B0=
} yH irm|o
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publicList findByNamedQuery(finalString query, L )kwMk
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finalObject parameter){ uq'T:d
return getHibernateTemplate A3MVNz$wo"
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().findByNamedQuery(query, parameter); ?m0|>[j
} Nvw'[?m
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publicList findByNamedQuery(finalString query, |%Pd*yZA
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finalObject[] parameters){ "luMz;B
return getHibernateTemplate uvi+#4~G
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().findByNamedQuery(query, parameters); `StlG=TB8
} b{_J%p
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publicList find(finalString query){ ]U82A**n
return getHibernateTemplate().find wMr*D['" #
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(query); -uX): h!
} }Dp/K4
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publicList find(finalString query, finalObject V_^p?Fi#
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parameter){ s9X?tWuL
return getHibernateTemplate().find WTbq)D(&[_
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(query, parameter); g{RVxGE7
} HW"@~-\
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public PaginationSupport findPageByCriteria {%gMA?b|"
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(final DetachedCriteria detachedCriteria){ @p"m{
return findPageByCriteria ]2Zl\}GwY
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); o !bV;]
} dD ?ZF6
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public PaginationSupport findPageByCriteria H[S[ y
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(final DetachedCriteria detachedCriteria, finalint ir!/{IQx
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startIndex){ ~lib~Y'-
return findPageByCriteria NCL!|
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(detachedCriteria, PaginationSupport.PAGESIZE,
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startIndex); Qh3BI?GZ'3
} ZW7z[,tk<.
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public PaginationSupport findPageByCriteria ^ZP
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(final DetachedCriteria detachedCriteria, finalint stQRl_('
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}
pageSize, cao=O
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finalint startIndex){ =Z}$X:
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return(PaginationSupport) j]P'xrWl]8
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getHibernateTemplate().execute(new HibernateCallback(){ iC2``[m"
publicObject doInHibernate zl $mt'\y
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(Session session)throws HibernateException { [0MNq]gxf
Criteria criteria = (P'{A>aHl0
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detachedCriteria.getExecutableCriteria(session); l]R=I2t
int totalCount = XCvL`
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((Integer) criteria.setProjection(Projections.rowCount ]sLdz^E3D
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()).uniqueResult()).intValue(); vj%3v4
criteria.setProjection +cWo^ d.
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(null); y~Z7sx0
List items = f*o+g:]3
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criteria.setFirstResult(startIndex).setMaxResults YC[cQX
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(pageSize).list(); ghGpi U$
PaginationSupport ps = }i$ER,hXh
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new PaginationSupport(items, totalCount, pageSize, y=!7PB_\|
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startIndex); #?"^: ,Y
return ps; 4v.{C"M
} jZr"d*Y
}, true); 7?ICXhu9
} UMUG~P&@
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public List findAllByCriteria(final +?)R}\\
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DetachedCriteria detachedCriteria){ <c%
return(List) getHibernateTemplate <P~pn!F}
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().execute(new HibernateCallback(){ g o9tvK
publicObject doInHibernate C <Pd_&
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(Session session)throws HibernateException { v`hn9O
Criteria criteria = [>D5(O
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detachedCriteria.getExecutableCriteria(session); IN_O!c0e
return criteria.list(); Z H2
} a(IUAh*mO
}, true); XM f>B|
} sm Kp3_r
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public int getCountByCriteria(final _9yW; i-
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DetachedCriteria detachedCriteria){ yXQ 28A
Integer count = (Integer) ZZM;%i-B
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getHibernateTemplate().execute(new HibernateCallback(){ u-M Td
publicObject doInHibernate #+&"m7
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(Session session)throws HibernateException { <!=:{&d%
Criteria criteria = GC`/\~TM
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detachedCriteria.getExecutableCriteria(session); MzMVs3w|
return & LhQr-g
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criteria.setProjection(Projections.rowCount U1Y0G[i)
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()).uniqueResult(); O{x-9p
} j1HeX
}, true); ~p?D[]h
return count.intValue(); V%'' GF
} L 8J] X7
} Ax6zx
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用户在web层构造查询条件detachedCriteria,和可选的 ?)g [Xc;K
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 _6m{zvyX>
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PaginationSupport的实例ps。 xFcW%m>9C
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ps.getItems()得到已分页好的结果集 }{}?mQ
ps.getIndexes()得到分页索引的数组 wbB\~*Z)
ps.getTotalCount()得到总结果数 #+H3b!8=
ps.getStartIndex()当前分页索引 d*x&Uh[K
ps.getNextIndex()下一页索引 v}\Fbe
ps.getPreviousIndex()上一页索引 d ATAH}r&
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ~x[(1
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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|
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一下代码重构了。 _FU}IfG>t
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我把原本我的做法也提供出来供大家讨论吧: F-XMy>9
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首先,为了实现分页查询,我封装了一个Page类: ]@m`bs_6
java代码: #\ECQF
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