Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ud/!@WG
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 (@^9oN~}
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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 *Dg@fxCQ
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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 9~UR(Ts}l
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分页支持类: B
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java代码: tiZH;t';<
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package com.javaeye.common.util; 5HbHJ.|r
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import java.util.List; W et0qt]
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publicclass PaginationSupport { 2* g2UP
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publicfinalstaticint PAGESIZE = 30; ^2'Y=g>
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privateint pageSize = PAGESIZE; .BPd06y
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privateList items; mlByE,S2E
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privateint totalCount; w[z=x
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privateint[] indexes = newint[0]; ':4ny]F
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privateint startIndex = 0; q[Ai^79
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public PaginationSupport(List items, int ]G[ "TX,
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totalCount){ nYtkTP!J6
setPageSize(PAGESIZE); [4yHXZxza
setTotalCount(totalCount); ]>~.U~
setItems(items); '
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setStartIndex(0); ?^|[Yzk
} gV]4R"/
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public PaginationSupport(List items, int 8>x5|
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totalCount, int startIndex){ 'ON/WKJr|W
setPageSize(PAGESIZE); le5@WG/x
setTotalCount(totalCount); ;W{z"L;nX
setItems(items); 5j`sJvq
setStartIndex(startIndex); 8$-MUF,
} T.#_v#oM
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public PaginationSupport(List items, int 'wPX.h?
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totalCount, int pageSize, int startIndex){ OXLB{|hH80
setPageSize(pageSize); /[6wm1?!
setTotalCount(totalCount);
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setItems(items); XB'rh F8rl
setStartIndex(startIndex); oN}\bK
} ~T}D#}
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publicList getItems(){ "*zDb|v
return items; }zA|M9%E
} g(P7CX+y
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publicvoid setItems(List items){ u4lM>(3Y}
this.items = items; *c#DB{N
} |e8A)xM]wC
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publicint getPageSize(){ ZvuY]=^3
return pageSize; b$2=w^*
} 3~`\FuHHe
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publicvoid setPageSize(int pageSize){ rE*yT(:w
this.pageSize = pageSize; `_yksh3zL4
} y6am(ugE
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publicint getTotalCount(){ 0^{Tq0Ri[
return totalCount; !o|
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} f.ua,,P.
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publicvoid setTotalCount(int totalCount){ 9@t&jznt<
if(totalCount > 0){ 8+!G/p
this.totalCount = totalCount; UVXruH
int count = totalCount / e[k\VYj[
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pageSize; e|A=sCN-
if(totalCount % pageSize > 0) %w_MRC
count++; CV|Ae [
indexes = newint[count]; ~a=]w#-KD
for(int i = 0; i < count; i++){ AYNz {9
indexes = pageSize * <!dZ=9^^1
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} {{A=^rr%C
}else{ `mkOjsj &
this.totalCount = 0; :V8oWMY
} :TrP3wV_
} }Bh\N5G%
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publicint[] getIndexes(){ 2s2KI=6
return indexes; :SFf}
} x^3K=l;N
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publicvoid setIndexes(int[] indexes){ qUe2(/TQu
this.indexes = indexes; }0R"ZPU1Rw
} _u-tRHh|A
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publicint getStartIndex(){ \ bNDeA&l
return startIndex; QdZHIgh`i
} AJ
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publicvoid setStartIndex(int startIndex){ \(Dm\7Q.
if(totalCount <= 0) ;d7Qw~v1s
this.startIndex = 0; L%7WHtU*#
elseif(startIndex >= totalCount) R
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this.startIndex = indexes = r=/L
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[indexes.length - 1]; Uwiy@T Z
elseif(startIndex < 0) eJOo~HIWQ
this.startIndex = 0; ke*&*mx"L
else{ ygm=q^bV]s
this.startIndex = indexes @6 jKjI
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[startIndex / pageSize]; On4Vqbks
} 09Oe-Bg
} Xa8_kv_
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publicint getNextIndex(){ Wbmqf
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int nextIndex = getStartIndex() + PClwGO8'&
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pageSize; ku v<
if(nextIndex >= totalCount) +DT
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return getStartIndex(); AxJf\B8
else 0} \;R5a<
return nextIndex; 1
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} G* mLb1
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publicint getPreviousIndex(){ uN9.U _
int previousIndex = getStartIndex() - arPqVMVr
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pageSize; 2\}6b4
if(previousIndex < 0) "^pF2JI
return0; (B+zh
else h7\EN
return previousIndex; ELV$!f|u
} +]Bx4r?p
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} +DT)7koA
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抽象业务类 h1_KZ[X
java代码: jK=-L#hz
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/** Cvs4dd%)i
* Created on 2005-7-12 ;S>ml
*/ f#vVk
package com.javaeye.common.business; bU(fH^
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import java.io.Serializable; .=b)Ae c
import java.util.List; EJrQ9"x&n
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import org.hibernate.Criteria; bF3}L=z
import org.hibernate.HibernateException; NE$=R"<Gv
import org.hibernate.Session; 7^8<[8
import org.hibernate.criterion.DetachedCriteria; -,xsUw4
import org.hibernate.criterion.Projections; My>{;n=}
import W^nG\"T^
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org.springframework.orm.hibernate3.HibernateCallback; .7zdA IKW
import 5@Lz4 `
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org.springframework.orm.hibernate3.support.HibernateDaoS eYjr/`>O
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upport; Jqi^Z*PuX
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import com.javaeye.common.util.PaginationSupport; ^$O,Gy) V
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public abstract class AbstractManager extends
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HibernateDaoSupport { +l$BUX
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privateboolean cacheQueries = false; ~); 7D'[
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privateString queryCacheRegion; 5SY( :!
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publicvoid setCacheQueries(boolean w+owx(mN@
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cacheQueries){ Ih0kdi
this.cacheQueries = cacheQueries; bjJ212J
} <yrl_vl{
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publicvoid setQueryCacheRegion(String q>ps99[=
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queryCacheRegion){ P\H$*6v(
this.queryCacheRegion = :u53zX[v
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queryCacheRegion; 6jtnH'E/
} &P{[22dQ
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publicvoid save(finalObject entity){ jz;"]k
getHibernateTemplate().save(entity); F.JvMy3
} S2fBZ=V8
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publicvoid persist(finalObject entity){ }%9A+w}o
getHibernateTemplate().save(entity); Lm }:`
} RI_3X5.KQ
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publicvoid update(finalObject entity){ =sW(2Im
getHibernateTemplate().update(entity); ]T! >]
} }A`4ae=
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publicvoid delete(finalObject entity){ mMvt#+O
getHibernateTemplate().delete(entity); B@Q Ate7
} 4`7:gfrO,
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publicObject load(finalClass entity, =7mn=
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finalSerializable id){ F|XRh 6j
return getHibernateTemplate().load xV4
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(entity, id); rBZ0(XSZQ
} FHS6Mk26
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publicObject get(finalClass entity, i7f/r.
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finalSerializable id){ aD@sb o
return getHibernateTemplate().get ]I#yS=;
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(entity, id); y-93 >Y
} @4D$Xl
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publicList findAll(finalClass entity){ qqSf17sW
return getHibernateTemplate().find("from ~%QVjzMC
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" + entity.getName()); COa"zg
} _kb
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publicList findByNamedQuery(finalString io$!z=W
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namedQuery){ z17x%jXy
return getHibernateTemplate ^[SQw)*
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().findByNamedQuery(namedQuery); ^xO
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} uFIr.U$V
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publicList findByNamedQuery(finalString query, geL)v7t+#
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finalObject parameter){ MkG3TODfHB
return getHibernateTemplate ?1Lzbou
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().findByNamedQuery(query, parameter); 3EN?{T<yf
} ^|?/
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publicList findByNamedQuery(finalString query, A7|!&fi
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finalObject[] parameters){ PYYOC"$
return getHibernateTemplate S$Tc\/{
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().findByNamedQuery(query, parameters); T<"Hh.h
} C{<qc,!4
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publicList find(finalString query){ -aPvls
return getHibernateTemplate().find `g&<7~\=A
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(query); 18 pi3i[
} Rw\
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publicList find(finalString query, finalObject Re**)3#gn
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parameter){ n0:Y*Op
return getHibernateTemplate().find JB~79Lsdz
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(query, parameter); qr[H0f]
} pt&(c[
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public PaginationSupport findPageByCriteria (-tF=wR,W
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(final DetachedCriteria detachedCriteria){ #8G(r9
return findPageByCriteria .olDmFQD
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); GtRc7,
} b/:&iG;
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public PaginationSupport findPageByCriteria h\ema|
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(final DetachedCriteria detachedCriteria, finalint |-l)$i@
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startIndex){ 7RQ.oee
return findPageByCriteria *P,dR]-m
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(detachedCriteria, PaginationSupport.PAGESIZE, ORhe?E]
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startIndex); a,3}
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} dHV3d'.P
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public PaginationSupport findPageByCriteria ^| L@f
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(final DetachedCriteria detachedCriteria, finalint fX=o,=-f
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pageSize, yES+0D 5<
finalint startIndex){ z;GR(;w/
return(PaginationSupport) c`94a SnV
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getHibernateTemplate().execute(new HibernateCallback(){ hce *G@b
publicObject doInHibernate \M-}(>Pfk
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(Session session)throws HibernateException { OTs vox|(
Criteria criteria = pBV_'A}ioh
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detachedCriteria.getExecutableCriteria(session); ;v0M
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int totalCount = aV?dy4o$
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((Integer) criteria.setProjection(Projections.rowCount @~v|t{G
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()).uniqueResult()).intValue();
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criteria.setProjection <u2rb6
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(null); ^a&-GhX;
List items = #jAlmxN
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criteria.setFirstResult(startIndex).setMaxResults O(U'G|
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(pageSize).list(); I^>m-M.
PaginationSupport ps = eYd6~T[9
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new PaginationSupport(items, totalCount, pageSize, rxZ%vzVQ>
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startIndex); [jb3lO$Xa
return ps; [\(}dnj:
} ZPHiR4fQli
}, true); ^.5`jdk
} 8zv=@`4@G
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public List findAllByCriteria(final ^V]DQ%v"I
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DetachedCriteria detachedCriteria){ VhdMKq~`
return(List) getHibernateTemplate "J|_1! 9
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().execute(new HibernateCallback(){ Ig9yd S-.
publicObject doInHibernate FV>j
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(Session session)throws HibernateException { y5;l?v94
Criteria criteria = $2u^z=`b!%
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detachedCriteria.getExecutableCriteria(session); DA'A-C2
return criteria.list(); t?JY@hT*
} bvZTB<rA
}, true); KLqn`m`O;
} 6q^Tq {I
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public int getCountByCriteria(final . C_\xb
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DetachedCriteria detachedCriteria){ %n<u- {`
Integer count = (Integer) r83chR9
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getHibernateTemplate().execute(new HibernateCallback(){ -:92<G\D
publicObject doInHibernate H"hL+F ^
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(Session session)throws HibernateException { 'Oyx
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Criteria criteria = Y{yN*9a79
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detachedCriteria.getExecutableCriteria(session); c5~d^
return TNYd_:j
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criteria.setProjection(Projections.rowCount ^zjQ(ca@"x
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()).uniqueResult(); uMW5F-~-+
} M
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}, true); q^nSYp#
return count.intValue(); 3fC|}<Wzt
} xi5/Wc6
} C~\/FrO?
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用户在web层构造查询条件detachedCriteria,和可选的 H`!%"
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ejY|o
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PaginationSupport的实例ps。 ~_vzss3-C
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ps.getItems()得到已分页好的结果集 PVBf'
ps.getIndexes()得到分页索引的数组 y?BzZ16\bL
ps.getTotalCount()得到总结果数 "X/cG9Lw
ps.getStartIndex()当前分页索引 ^fj):n5/
ps.getNextIndex()下一页索引 ['F,
ps.getPreviousIndex()上一页索引 G/tah@N[7
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 "zJGYBen
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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 F12tOSfu*
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一下代码重构了。 TF %8pIg>Z
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我把原本我的做法也提供出来供大家讨论吧: &&