Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 uM)9b*Vbo
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 *_/eAi/WG
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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 y~c4:*L3
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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 BdB`
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分页支持类: :KV,:13`D
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java代码: &>zy_)
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package com.javaeye.common.util; o(X90X
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import java.util.List; %<J(lC9,C
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publicclass PaginationSupport { H&yFSz}6a
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publicfinalstaticint PAGESIZE = 30; \/'#=q1
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privateint pageSize = PAGESIZE; RSPRfYU/
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privateList items; {F(-s"1;xO
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privateint totalCount; g=oeS%>E
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privateint[] indexes = newint[0]; t.>te'DK/
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privateint startIndex = 0; ."F'5eTT~
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public PaginationSupport(List items, int 9#s95RO
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totalCount){ ek(kY6x:
setPageSize(PAGESIZE); 5}X<(q(
setTotalCount(totalCount); zqvRkMWc M
setItems(items); ,Y g5X
setStartIndex(0); s`Be#v
} G&%nF4
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public PaginationSupport(List items, int C>JekPeM
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totalCount, int startIndex){ +B`'P9Zk@
setPageSize(PAGESIZE); =q"w2b&
setTotalCount(totalCount); ?O<`h~'$+
setItems(items); \'s$ZN$k
setStartIndex(startIndex); h7de9Rt
} IFC%%It5,
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public PaginationSupport(List items, int To# E@Nw
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totalCount, int pageSize, int startIndex){ k\+y4F8$x
setPageSize(pageSize); Gs_*/E7,
setTotalCount(totalCount); gJ FR1
setItems(items); |n|U;|'^
setStartIndex(startIndex); HQ|o%9~
} ibZt2@GB)I
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publicList getItems(){ [|:QE~U@
return items; "t(1tWO1o
} ?Kx6Sf<i
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publicvoid setItems(List items){ klK-,J
this.items = items;
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} ShL1'Z}^{
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publicint getPageSize(){ 71k!k&Im
return pageSize; A0cM(w{7_
} fnLR
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publicvoid setPageSize(int pageSize){ itqQ)\W
this.pageSize = pageSize; 8BYIxHHz
} :Az8K )
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publicint getTotalCount(){ 4o1Q7
return totalCount; ;yk9(wea}"
} /#-,R,Q
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publicvoid setTotalCount(int totalCount){ |Hx%f
if(totalCount > 0){ qiG]nCq
this.totalCount = totalCount; Nj0-`j0E
int count = totalCount / RpHpMtvNo/
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pageSize; "-G&=(
if(totalCount % pageSize > 0) %iK%$
count++; I#i?**
indexes = newint[count]; ggerh#
for(int i = 0; i < count; i++){ 2-B6IPeI
indexes = pageSize * Oq #o1>
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} ?wGiog<Q{
}else{ 5."5IjZu
this.totalCount = 0; \\Y,?x_0T
} "V:
} 2~vo+ng
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publicint[] getIndexes(){ _aVJ$N.
return indexes; /uK)rG
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} IO}+[%ptc*
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publicvoid setIndexes(int[] indexes){ qIB>6bv#x
this.indexes = indexes; C>AcK#-x,{
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publicint getStartIndex(){ +#0~:&!9
return startIndex; >NJjS8f5
} 7*+Km'=M
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publicvoid setStartIndex(int startIndex){ V{43HA10b
if(totalCount <= 0) x:p}w[WM
this.startIndex = 0; DYc.to-
elseif(startIndex >= totalCount) :M@MmpPh
this.startIndex = indexes B,4q>KQA
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[indexes.length - 1]; ~D*b3K8X
elseif(startIndex < 0) pfR"s:#
this.startIndex = 0; A_@I_V$
else{ nlaG<L#
this.startIndex = indexes M|ms$1x
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[startIndex / pageSize]; 4 ^4d9?c
} S)+CTVVE
} o\&~CW~@~
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publicint getNextIndex(){ DTPay1]6
int nextIndex = getStartIndex() + \WcB9
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pageSize; 5!tb$p#z
if(nextIndex >= totalCount) `{DG;J03[
return getStartIndex(); %06vgjOa (
else "@4ghot t
return nextIndex; !Ri
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} *_PPrx5
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publicint getPreviousIndex(){ Ey'J]KVW
int previousIndex = getStartIndex() - WK*S4c
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pageSize; TMqY4;UeL
if(previousIndex < 0) Ssw&'B|o
return0; |gW
else $6#
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return previousIndex; -3` "E%9
} U_l7CCK +
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} |:N>8%@6c
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抽象业务类 \"'\MA
java代码: 3 "Yif
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/** Ny^'IUu
* Created on 2005-7-12 r1;e 0\?`
*/ )&,K94
package com.javaeye.common.business; tFiR!f)
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import java.io.Serializable; Tm_8<$ 7
import java.util.List; [Tp%"f1
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import org.hibernate.Criteria; B)6#Lp3
import org.hibernate.HibernateException; {fU?idY)c
import org.hibernate.Session; 036[96t,F
import org.hibernate.criterion.DetachedCriteria; B?3juyB`--
import org.hibernate.criterion.Projections; ^)0 9OV+hF
import VoM6
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org.springframework.orm.hibernate3.HibernateCallback; `%=<R-/#7S
import G6Nb{m
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org.springframework.orm.hibernate3.support.HibernateDaoS }Eh*xOta
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upport; yFjVKp'P
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import com.javaeye.common.util.PaginationSupport; e:E# b~{
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public abstract class AbstractManager extends k ZxW"2
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HibernateDaoSupport { "hPCQp`Tj
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privateboolean cacheQueries = false; LT_iS^&1
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privateString queryCacheRegion; WYszk ,E
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publicvoid setCacheQueries(boolean _a5(s2wq+
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cacheQueries){ ;^ 3$kF
this.cacheQueries = cacheQueries; 1'O0`Me>#
} *aRX \TnN
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publicvoid setQueryCacheRegion(String -5k2j^r;
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queryCacheRegion){ Cv^`&\[SW+
this.queryCacheRegion = %Q~CB7ILK
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queryCacheRegion; PJ
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} /!T> b:0
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publicvoid save(finalObject entity){ Eju~}:Lo
getHibernateTemplate().save(entity); ,.v7FM^gO
} Ns=AjhLc z
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publicvoid persist(finalObject entity){ z-,VnhLx
getHibernateTemplate().save(entity); *e/K:k
} b$-e\XB!
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publicvoid update(finalObject entity){ GEe`ZhG,
getHibernateTemplate().update(entity); z$[C#5+2
} jd:B \%#![
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publicvoid delete(finalObject entity){ Y*LaBxt Q
getHibernateTemplate().delete(entity); L1#Ij#
} b,<9
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publicObject load(finalClass entity, !;3PG9n3|h
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finalSerializable id){ ,pt%)
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return getHibernateTemplate().load ,Em$ !n
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(entity, id); d,cN(
} Q+$Tt7/
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publicObject get(finalClass entity, vkcRm`.
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finalSerializable id){ cAuY4RV
return getHibernateTemplate().get v:|(8Y
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(entity, id); Lm%GR[tyQ
} ofdZ1F
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publicList findAll(finalClass entity){ XFqJ 'R
return getHibernateTemplate().find("from q4k@l
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" + entity.getName()); & >JDPB?5
} n$)_9:Z-j
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publicList findByNamedQuery(finalString [=%YV# O
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namedQuery){ $u9]yiY.{
return getHibernateTemplate :@3Wg3N
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().findByNamedQuery(namedQuery); 0b|zk <
} (ywo
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publicList findByNamedQuery(finalString query, %_M2N.n
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finalObject parameter){ 'r}fZ
return getHibernateTemplate +M\8>/0oA
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().findByNamedQuery(query, parameter); nCxAQ|P?
} Ug"rJMZG
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publicList findByNamedQuery(finalString query, F[`ZqW
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finalObject[] parameters){ m
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return getHibernateTemplate 'cd N3i(
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().findByNamedQuery(query, parameters); #`SD$;
} S"2qJ!.u
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publicList find(finalString query){ 8<#U9]
return getHibernateTemplate().find cPF<D$B
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(query); L/r@ S'
} NucM+r1P
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publicList find(finalString query, finalObject G*8GGWB^a
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parameter){ "4xfrlOc
return getHibernateTemplate().find z01>'
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(query, parameter); Q5+_u/
} 6j9)/ HP
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public PaginationSupport findPageByCriteria '\ DSTr:N
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(final DetachedCriteria detachedCriteria){ {U11^w1"3
return findPageByCriteria Q=cQLf;/'
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); rjWLMbd.<
} (jWss V1
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public PaginationSupport findPageByCriteria j) vlM+
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(final DetachedCriteria detachedCriteria, finalint r64u31.)
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startIndex){ Ss?CfRM
return findPageByCriteria W0`Gc
{
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(detachedCriteria, PaginationSupport.PAGESIZE, 0lk;F
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startIndex); 3TuC+'`G
} ik,lSTBD
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public PaginationSupport findPageByCriteria $ItF])Bj5N
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(final DetachedCriteria detachedCriteria, finalint g=)J~1&p
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pageSize, 6)gd^{
finalint startIndex){ }OShT+xeX
return(PaginationSupport) kMxazx1
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getHibernateTemplate().execute(new HibernateCallback(){ mz7l'4']+
publicObject doInHibernate XAOak$(j
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(Session session)throws HibernateException { uV6g[J
Criteria criteria = @$@mqHI}
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detachedCriteria.getExecutableCriteria(session); :K.4 n
int totalCount = D$k8^Vs
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((Integer) criteria.setProjection(Projections.rowCount 1qdZc_x
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()).uniqueResult()).intValue(); Mio>{%/
criteria.setProjection zzpZ19"`1
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(null); tOdT[&
List items = }E<^gAh}
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criteria.setFirstResult(startIndex).setMaxResults ]n1dp2aH
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(pageSize).list(); JHV)ZOO
PaginationSupport ps = Sq]pQ8
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new PaginationSupport(items, totalCount, pageSize, MEZ{j%-a
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startIndex); \y
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return ps; =J'P.
} C"<s/h
}, true); [`fI:ao|
} 5OLQw(E
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public List findAllByCriteria(final NC23Z0y
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DetachedCriteria detachedCriteria){ hXL|22>w<
return(List) getHibernateTemplate gvavs+H%
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().execute(new HibernateCallback(){ '"YYj$>
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publicObject doInHibernate `$;+g ,
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(Session session)throws HibernateException { XJ\hd,R
Criteria criteria = uGtV}-t:
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detachedCriteria.getExecutableCriteria(session); *7gT}O;p 5
return criteria.list(); %IZ)3x3l
} j+ ::y) $
}, true); rj]
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} cgZaPw2
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public int getCountByCriteria(final 7qIB7 _K5
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DetachedCriteria detachedCriteria){ 5N/Lk>p1u
Integer count = (Integer) fv'4f$U
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getHibernateTemplate().execute(new HibernateCallback(){ ? 5|/
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publicObject doInHibernate .(Y6$[#@
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(Session session)throws HibernateException {
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Criteria criteria = 649 !=
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detachedCriteria.getExecutableCriteria(session); 440FhDMj
return khX|"d360
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criteria.setProjection(Projections.rowCount /XpSe<3
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()).uniqueResult(); D!3{gV#
} FvImX
}, true); 6SEltm(
return count.intValue(); C7"HQQ
} __N.#c/l{
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用户在web层构造查询条件detachedCriteria,和可选的 wK5_t[[
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 zQfkMa.
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PaginationSupport的实例ps。 @)0 Y~A )
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ps.getItems()得到已分页好的结果集 sBW3{uK
ps.getIndexes()得到分页索引的数组 rG6\ynBX%
ps.getTotalCount()得到总结果数 S!dHNA:iU
ps.getStartIndex()当前分页索引 C3"&sdLb$
ps.getNextIndex()下一页索引 vA>W9OI
ps.getPreviousIndex()上一页索引 v*TeTA
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 UxqWnHH.`
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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 ]Z@k|Nw
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一下代码重构了。 }~zO+Wf2
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我把原本我的做法也提供出来供大家讨论吧: n2'|.y}Um:
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首先,为了实现分页查询,我封装了一个Page类: ]P3[.$z
java代码: DrS?=C@
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