Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 OtqLigt&l
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 2xm?,p`
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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 ZWW}r~d{
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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 W]]2Uo.
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分页支持类: nXW1 :
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java代码: 3Or3@e5r
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package com.javaeye.common.util; 2l%iXK[
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import java.util.List; q@>
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publicclass PaginationSupport { m>:ig\
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publicfinalstaticint PAGESIZE = 30; l,8|E
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privateint pageSize = PAGESIZE; ovVU%2o1b
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privateList items; Jrl
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privateint totalCount; zj4JWUM2
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privateint[] indexes = newint[0]; L j\<qF~n
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privateint startIndex = 0; 4K% YS
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public PaginationSupport(List items, int Yq.@7cJ
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totalCount){ ]kvE+m&p}^
setPageSize(PAGESIZE); '93&?
setTotalCount(totalCount); c" HCc]
setItems(items); Jl}7]cVq#
setStartIndex(0); ~=Sr0+vV
} }=)"uv
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public PaginationSupport(List items, int OMNdvrE*=O
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totalCount, int startIndex){ )A"7l7?.n)
setPageSize(PAGESIZE); :W55JD'
setTotalCount(totalCount); dD!SgK [Jv
setItems(items); N9Vcp~;
setStartIndex(startIndex); ABf#!G
} b*7i&q'H
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public PaginationSupport(List items, int uEY5&wX`
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totalCount, int pageSize, int startIndex){ "b;?2_w:E
setPageSize(pageSize); =cY]cPO
setTotalCount(totalCount); n9ih^H
setItems(items); H2p;J#cv@
setStartIndex(startIndex); q3t@)+l>*
} uWQ.h ,
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publicList getItems(){ B7C6Mau
return items; Pd?YS!+S
} N11am
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publicvoid setItems(List items){ oKiu6=
this.items = items; &aU+6'+QXB
} t@v8>J%K
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publicint getPageSize(){ FeJ5^Gh.
return pageSize; 9EW 7,m{A
} !LA#c'
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publicvoid setPageSize(int pageSize){ #t*c*o
this.pageSize = pageSize; 7tQiKrhp
} K(Nk|gQ
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publicint getTotalCount(){ E&AR=yqk
return totalCount; w.jATMJ)F
} 'AU!xG6OQ
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publicvoid setTotalCount(int totalCount){ *@Z'{V\
if(totalCount > 0){ oc3/
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this.totalCount = totalCount; ]0O$2 j_ 7
int count = totalCount / ZBWe,Xvq
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pageSize; ]
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if(totalCount % pageSize > 0) bE{`g]C5
count++; 1['A1,
indexes = newint[count]; c1f6RCu$b
for(int i = 0; i < count; i++){ '_%Jw:4k
indexes = pageSize * PC5FfX
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} 1vr/|RWW
}else{ gkjZX
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this.totalCount = 0; n >^?BU
} S_atEmQ
} ZL
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publicint[] getIndexes(){ )_ y{^kn3^
return indexes; V l%k:
} Q]HRg4r
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publicvoid setIndexes(int[] indexes){ L r,$98Dy
this.indexes = indexes; iT5%X
} A@4Cfb@
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publicint getStartIndex(){ l #Tm`br
return startIndex; r]yq
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} b]~M$y60q
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publicvoid setStartIndex(int startIndex){ [g{}0[ew
if(totalCount <= 0) *w;f\zW
this.startIndex = 0; f55Ev<oOa
elseif(startIndex >= totalCount) #'[ f^xgJ
this.startIndex = indexes q:'(1y~
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[indexes.length - 1]; 9o6y7hEQy
elseif(startIndex < 0) *e R$
this.startIndex = 0; mMR[(
else{
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this.startIndex = indexes pGC`HTo|
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[startIndex / pageSize]; *VpQ("
} X*sF-T$.
} fAK
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publicint getNextIndex(){ }5gQZ'ys'
int nextIndex = getStartIndex() + $t]DxMd
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pageSize; >2rFURcD
if(nextIndex >= totalCount) z<ek?0?yS
return getStartIndex(); a7Jr} "B
else :p{iBDA
return nextIndex; f,$CiZ"
} `4o;Lz~
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publicint getPreviousIndex(){ X!@Gv:TD
int previousIndex = getStartIndex() - gyPF!"!5dq
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pageSize; /swTn1<Y
if(previousIndex < 0) P
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return0; _tjH=Ff$
else %w@(V([(c
return previousIndex; 1>Op)T>{c
} qIk6S6
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} _CgD7d
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抽象业务类 6O"0?wG+
java代码: e'jR<ln|
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/** &,\S<B2.
* Created on 2005-7-12 U;^{uQJ+,
*/ \3KCZ
package com.javaeye.common.business; `@ObM[0p(
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import java.io.Serializable; l6O2B/2j
import java.util.List; 71~V*
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import org.hibernate.Criteria; DCNuvrZ
import org.hibernate.HibernateException; U{ Y)\hR-
import org.hibernate.Session; A_2ppEG
import org.hibernate.criterion.DetachedCriteria; OTRTa{TB
import org.hibernate.criterion.Projections; 8z+ CYeV
import (YR1ML3N
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org.springframework.orm.hibernate3.HibernateCallback; m^ILcp!
import i^n&K:6
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org.springframework.orm.hibernate3.support.HibernateDaoS y.>r>o"0
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upport; h7*m+/ O
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import com.javaeye.common.util.PaginationSupport; JsH9IK:
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public abstract class AbstractManager extends )qKfTtN`
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HibernateDaoSupport { $`uL^ hlj]
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privateboolean cacheQueries = false; O9qEKW)a
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privateString queryCacheRegion; (BJs6":BFe
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publicvoid setCacheQueries(boolean >FY`xl\m}<
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cacheQueries){ rc$G0O
this.cacheQueries = cacheQueries; [1E u6X6
} 6VA@ ;g0$
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publicvoid setQueryCacheRegion(String l<gg5 Zea
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queryCacheRegion){ < B'BlqTS
this.queryCacheRegion = $Q?<']|A
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queryCacheRegion; |=SaI%%Be
} ua2SW(C@
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publicvoid save(finalObject entity){ Jo2:0<VL
getHibernateTemplate().save(entity); s]}P
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} E*CY/F I_
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publicvoid persist(finalObject entity){ WT1ch0~2
getHibernateTemplate().save(entity); P[D^*}
} H3&$: h
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publicvoid update(finalObject entity){ vmL0H)q
getHibernateTemplate().update(entity); Q|;8\5
} iLgWzA
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publicvoid delete(finalObject entity){ pwm]2}+
getHibernateTemplate().delete(entity); Xbfn@7m
} b,s T[!X[
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publicObject load(finalClass entity, `,xKK+~YG-
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finalSerializable id){ 0kmZO"K#e
return getHibernateTemplate().load 'H97D-86/
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(entity, id); o@"H3
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} G!wFG-Y}
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publicObject get(finalClass entity, kvKbl;<
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finalSerializable id){ XO219
return getHibernateTemplate().get 3^C
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(entity, id); 0*x
} 3PPN_Z
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publicList findAll(finalClass entity){ !AgW@
return getHibernateTemplate().find("from NKh 8'=S
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" + entity.getName()); SxH b76 ;
} PY~cu@'k{
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publicList findByNamedQuery(finalString 5ILce%#zL
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namedQuery){ z^@98:x
return getHibernateTemplate c?IFI
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().findByNamedQuery(namedQuery); }fdo
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} u m,Zt
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publicList findByNamedQuery(finalString query, !5&%
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finalObject parameter){ n YWS'i@
return getHibernateTemplate ]|'Mf;
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().findByNamedQuery(query, parameter); &E0P`F,GQA
} yKgA"NaM
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publicList findByNamedQuery(finalString query, ^pIT,|myY7
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finalObject[] parameters){ w7s+6,
return getHibernateTemplate [O7:<co
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().findByNamedQuery(query, parameters); }HRM6fR1S
} a;8q7nC
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publicList find(finalString query){ C,HKao\
return getHibernateTemplate().find [HLXWu3
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(query); 6O>NDTd%
} Kj.4Z+^
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publicList find(finalString query, finalObject \%g#
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parameter){ -YPUrU[)
return getHibernateTemplate().find :/A3l=}iV
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(query, parameter); tUaDwIu#
} krnxM7y
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public PaginationSupport findPageByCriteria Xz4T_-X8d
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(final DetachedCriteria detachedCriteria){ kLtm_
return findPageByCriteria %a$ l%8j&
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); sT
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} K*NCIIDh
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public PaginationSupport findPageByCriteria W"MwpV
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(final DetachedCriteria detachedCriteria, finalint AR8zCKBc^
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startIndex){ }]VFLBl`w
return findPageByCriteria #6* j+SX^
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(detachedCriteria, PaginationSupport.PAGESIZE, U|ZYoc+](
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startIndex); 3g
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} ,aq0Q<}~lc
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public PaginationSupport findPageByCriteria vVBu/)
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(final DetachedCriteria detachedCriteria, finalint aGSix}b1P
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pageSize, J'4Pp<
finalint startIndex){ \k&2nYVHf
return(PaginationSupport) kn9ul3c
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getHibernateTemplate().execute(new HibernateCallback(){ - >_rSjnM{
publicObject doInHibernate /zV&ebN]
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(Session session)throws HibernateException { {^(h*zxn
Criteria criteria = l4:B(
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detachedCriteria.getExecutableCriteria(session); b%A+k"d
int totalCount = $DS|jnpV
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((Integer) criteria.setProjection(Projections.rowCount Pnl+.?
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()).uniqueResult()).intValue(); P-]u&m/6
criteria.setProjection '/O >#1
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(null); `|=hl~
List items = n[+$a)$8
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criteria.setFirstResult(startIndex).setMaxResults }aSTo"~m#
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(pageSize).list(); R^*%yjy9
PaginationSupport ps = o|`%>&jP
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new PaginationSupport(items, totalCount, pageSize, z}.Q~4 f0D
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startIndex); W!jg
return ps; lf2Q
} e)BU6m%
}, true); ~S\y)l\wZ
} y).dw(
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public List findAllByCriteria(final M1HGXdN* B
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DetachedCriteria detachedCriteria){ a*2JLK
return(List) getHibernateTemplate ka=EOiX.
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().execute(new HibernateCallback(){ to,\sc
publicObject doInHibernate 0^('hS&
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(Session session)throws HibernateException { `En>o~ L;
Criteria criteria = y?Cq{(
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detachedCriteria.getExecutableCriteria(session); 5.M82rR;~
return criteria.list(); BZP{{
} Ht4A
}, true); 6N<
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} r}nz )=\Cj
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public int getCountByCriteria(final eXA@J[-M:
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DetachedCriteria detachedCriteria){ }kZ)|/]kn
Integer count = (Integer) &iI5^b-P
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getHibernateTemplate().execute(new HibernateCallback(){ /<
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publicObject doInHibernate i+@t_pxc
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(Session session)throws HibernateException { O&g$dK!Rad
Criteria criteria = 2%_UOEayU
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detachedCriteria.getExecutableCriteria(session); L)"E _
return FE'F@aS\
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criteria.setProjection(Projections.rowCount 1ir~WFP
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()).uniqueResult(); y^:N^Gt
} ?s]+2Tq
}, true); PblO?@~O
return count.intValue(); / n@by4;W
} tRYi q
} }rA
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用户在web层构造查询条件detachedCriteria,和可选的 HDQH7Bs
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 vYNu=vnM
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PaginationSupport的实例ps。
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ps.getItems()得到已分页好的结果集 hQ _gOI
ps.getIndexes()得到分页索引的数组 m{?uR.O
ps.getTotalCount()得到总结果数 U2CCjAgRs
ps.getStartIndex()当前分页索引 yL#2|t(
ps.getNextIndex()下一页索引 v=J[p;H^H
ps.getPreviousIndex()上一页索引 eh /QFm
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 bM>5=Zox
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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 wvz_)bN~A
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一下代码重构了。 R4AKp1Y
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我把原本我的做法也提供出来供大家讨论吧: JW9U&Bj{
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