Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ~g;
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 X"MU3]
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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 <W)u{KS#TY
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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 q%YV$$c
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分页支持类: dP2irC%f8
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java代码: ,,L2(N
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package com.javaeye.common.util; d(`AXyw
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import java.util.List; c"tJld5F_
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publicclass PaginationSupport { sJx+8
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publicfinalstaticint PAGESIZE = 30; )v4b
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privateint pageSize = PAGESIZE; {LzH&qu
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privateList items; _6@hTen`
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privateint totalCount; =WZqQq{
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privateint[] indexes = newint[0]; 07g':QU@
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privateint startIndex = 0; eW'2AT?2H%
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public PaginationSupport(List items, int qml2XJ>
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totalCount){ D('2p8;2"7
setPageSize(PAGESIZE); Z;Rp+X
setTotalCount(totalCount); G2{O9
setItems(items); SzDKByi
setStartIndex(0); ?(6m VyIe
} C#V ~Y
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public PaginationSupport(List items, int \VMD$zZx
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totalCount, int startIndex){ Q;Wj?8}
setPageSize(PAGESIZE); V&]DzjT/
setTotalCount(totalCount); pE.PX
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setItems(items); -5l6&Y
setStartIndex(startIndex); _?voU
} J
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public PaginationSupport(List items, int %6%<?jZ
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totalCount, int pageSize, int startIndex){ o_M.EZO
setPageSize(pageSize); _Us*+
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setTotalCount(totalCount); A=zPLq{Sb
setItems(items); )2q~u%9n
setStartIndex(startIndex); <Peebv&v
} gd/H``x|Y
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publicList getItems(){ gwd (N
return items; nP~({:l8X
}
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publicvoid setItems(List items){ ma$Prd
this.items = items; 5qUTMT['T
} |wE3UWsy
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publicint getPageSize(){ 2f`nMW
return pageSize; YT/kC'A
} _/* U2.xS
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publicvoid setPageSize(int pageSize){ zjL.Bhiud
this.pageSize = pageSize; SHb(O<6
} spofLu.
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publicint getTotalCount(){ ~9\WFF/
return totalCount; \qvaE+
} BElJB&I
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publicvoid setTotalCount(int totalCount){ nfW&1a
if(totalCount > 0){ q}BzyC=:n
this.totalCount = totalCount; gnp~OVDqfL
int count = totalCount / ^[-el=oKn0
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pageSize; NC qo@vE
if(totalCount % pageSize > 0) t2" (2
count++; !
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indexes = newint[count]; *Oc.9 F88"
for(int i = 0; i < count; i++){ Awv`) "RAR
indexes = pageSize * XMB[h
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} '\fY<Q:!
}else{ %n%xR%|
this.totalCount = 0; PfS:AIy
} tj]9~eJ-
} ZlYPoOq
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publicint[] getIndexes(){ ;Yfv!\^ |
return indexes; :4)Qt
} qjAWeS/
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publicvoid setIndexes(int[] indexes){ [+*$\
this.indexes = indexes; /WV7gO&L1
} >R{qESmP=
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publicint getStartIndex(){ AB Xl
return startIndex; _{vkX<s
} `dMqe\o%!
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publicvoid setStartIndex(int startIndex){ ;g_>
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if(totalCount <= 0) {HC@u{K-
this.startIndex = 0; ]{
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elseif(startIndex >= totalCount) 0,s$T2
this.startIndex = indexes bb42v7?
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[indexes.length - 1]; n26Y]7N
elseif(startIndex < 0) Kz<@x`0
this.startIndex = 0; 8By,#T".
else{ &Lt[WT$
this.startIndex = indexes ultG36.x
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[startIndex / pageSize]; GBFw+v/|4
} &AuF]VT
} 0U/K7sZ
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publicint getNextIndex(){ DcIvhB p
int nextIndex = getStartIndex() + B{oU,3U>
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pageSize; SYeadsvF
if(nextIndex >= totalCount) 04%S+y.6&Y
return getStartIndex(); &|%6|u9
else ]`g<w#
return nextIndex; rPc7(,o*
} w#JJXXQI
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publicint getPreviousIndex(){ V>64/
int previousIndex = getStartIndex() - ]%uZ\Q;9p
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pageSize; E|YdcS
if(previousIndex < 0) Sp}D;7
return0; 6OiSK@<Hk
else [U#72+K
return previousIndex; T&T/C@z'R
} 58%'UwKn
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} j7FN\
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抽象业务类 H$ftGwS8
java代码: ;v17K
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/** d_S*#/k
* Created on 2005-7-12 %8aC1x
*/ wiOgyMdx
package com.javaeye.common.business; |8%m.fY`
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import java.io.Serializable; ^ yh'lh/
import java.util.List; N3t0-6$_
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import org.hibernate.Criteria; E6Rz@"^XV
import org.hibernate.HibernateException; sfr(/mp(
import org.hibernate.Session; n/QF2&X7)
import org.hibernate.criterion.DetachedCriteria; RWgDD;&_[a
import org.hibernate.criterion.Projections; *xf ._~E
import 6b8;}],|
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org.springframework.orm.hibernate3.HibernateCallback; dk
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import @4%L36k
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org.springframework.orm.hibernate3.support.HibernateDaoS x?x`oirh
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upport; x\?;=@AW
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import com.javaeye.common.util.PaginationSupport; KPSh#x&I
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public abstract class AbstractManager extends *O:r7_ Y0
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HibernateDaoSupport { ERUt'1F?]
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privateboolean cacheQueries = false; I O%6 O
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privateString queryCacheRegion; 2LCB])X
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publicvoid setCacheQueries(boolean ~mV"i7VX
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cacheQueries){ _a_xzv'
this.cacheQueries = cacheQueries; YL
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} H@X oqgI
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publicvoid setQueryCacheRegion(String
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queryCacheRegion){ 71#I5*8
this.queryCacheRegion = Z'pQ^MO
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queryCacheRegion; 3qH QX?a
} h9$ Fx
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publicvoid save(finalObject entity){ oq-<ob
getHibernateTemplate().save(entity); d;tkJ2@NO
} 2y0J`!/)
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publicvoid persist(finalObject entity){ tg4Y i|5
getHibernateTemplate().save(entity); zWw2V}U!
} w)E@*h<Z
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publicvoid update(finalObject entity){ QYXx:nIrg
getHibernateTemplate().update(entity); I~PDaZP
} B}OY/J/*8
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publicvoid delete(finalObject entity){ DPe]daF
getHibernateTemplate().delete(entity); ^x*nq3^h\
} 6
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publicObject load(finalClass entity, B bhfG64
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finalSerializable id){ ,!G{5FF8:
return getHibernateTemplate().load mtic>
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(entity, id); Ot&:mT!2
} YF#HSf7
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publicObject get(finalClass entity, g1(Xg.
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finalSerializable id){ +ww^ev%
return getHibernateTemplate().get ||2Q~*:
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(entity, id); qv
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} @e~]t}fH
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publicList findAll(finalClass entity){ di9!lS$
return getHibernateTemplate().find("from Hx^!:kxk
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" + entity.getName()); Rg29
} F9c`({6k
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publicList findByNamedQuery(finalString m!XI {F@x
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namedQuery){ u#W5`sl
return getHibernateTemplate B UUf;Vv
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().findByNamedQuery(namedQuery); \a"Ct'
} u]C`6)>
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publicList findByNamedQuery(finalString query, BOlAm*tFt
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finalObject parameter){ QrD o|GtE
return getHibernateTemplate t$&Qv)
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().findByNamedQuery(query, parameter); Q+|{Bs)6i1
} k>4qkigjc
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publicList findByNamedQuery(finalString query, X CB?ll*^
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finalObject[] parameters){ ~KjJ\b)R
return getHibernateTemplate ;:&?=d
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().findByNamedQuery(query, parameters); ~ <0Z>qr
} -ML6d&cm
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publicList find(finalString query){ }pNX@C#De
return getHibernateTemplate().find HgBJf~q~U
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(query); )\/
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} yT OyDm-
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publicList find(finalString query, finalObject 6@;ha=[+
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parameter){ wWW~_zP0
return getHibernateTemplate().find Q.-*7h8
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(query, parameter); YZ#V#[j'^
} e]+OO
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public PaginationSupport findPageByCriteria W-2i+g)
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(final DetachedCriteria detachedCriteria){ 8``;0}'PC
return findPageByCriteria <~Qi67I
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(detachedCriteria, PaginationSupport.PAGESIZE, 0);
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} UgHf*m
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public PaginationSupport findPageByCriteria O0l^*nZ46t
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(final DetachedCriteria detachedCriteria, finalint 'E;W
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startIndex){ 8@K^|xeQ
return findPageByCriteria q?{}3 dPC
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(detachedCriteria, PaginationSupport.PAGESIZE, q1Qje%9@t
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startIndex); 0O@_cW
} y+mElG$F
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public PaginationSupport findPageByCriteria <zfe}0
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(final DetachedCriteria detachedCriteria, finalint +`en{$%%
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pageSize, }Ag|gF!_
finalint startIndex){ SQ(apc}N4
return(PaginationSupport) J}g~uW
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getHibernateTemplate().execute(new HibernateCallback(){ O;XG^s@5
publicObject doInHibernate w*LbH]l<-
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(Session session)throws HibernateException { <zB*'m
Criteria criteria = 7Ur?ep
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detachedCriteria.getExecutableCriteria(session); ,\ldz(D?+
int totalCount = CDg AGy
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((Integer) criteria.setProjection(Projections.rowCount nnCug
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()).uniqueResult()).intValue(); ``4wX-y
criteria.setProjection +H'\3^C-
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(null); J%v5d*$.
List items = GG-[`!>.pw
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criteria.setFirstResult(startIndex).setMaxResults ?T*";_o,B
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(pageSize).list(); *K!++k!Ixa
PaginationSupport ps = I@Z)<5Zf
x!{
new PaginationSupport(items, totalCount, pageSize, crmUrF#
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startIndex); xxX/y2\
return ps; CMVS W6
} `| 9K u
}, true); $C_M&O}
} PnWD}'0V
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public List findAllByCriteria(final F|eu<^"$ H
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DetachedCriteria detachedCriteria){ +$pJ5+v
return(List) getHibernateTemplate X-Ycz 5?
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().execute(new HibernateCallback(){ \KM|f9-b
publicObject doInHibernate F-0UdV
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(Session session)throws HibernateException { v[#)GB
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Criteria criteria = cdp0!W4Gi
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detachedCriteria.getExecutableCriteria(session); ,seFkG@1
return criteria.list(); c~tAvDX
} vjK, I9
}, true); 0-xCp ~vE
} vA?_-. J
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public int getCountByCriteria(final #ooc)),
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DetachedCriteria detachedCriteria){ 'h*Zc}Q:
Integer count = (Integer) TlPVHJyt
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getHibernateTemplate().execute(new HibernateCallback(){ gue(C(~.k_
publicObject doInHibernate 1L[S*X
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(Session session)throws HibernateException { XVUf,N,
Criteria criteria = $L{7%]7QC
^
}#f()
detachedCriteria.getExecutableCriteria(session); j[DIz@^
return a-PGW2G
h([0,:\
criteria.setProjection(Projections.rowCount ]h@{6N'oNS
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()).uniqueResult(); 0|C[-ppr
} 7%CIt?Z%
}, true); `"Dy%&U
return count.intValue(); gMZ&,n4
} u%opY<h
} <o@ )SD~K
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用户在web层构造查询条件detachedCriteria,和可选的 3
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 +89o`u_l%
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PaginationSupport的实例ps。 C4_t_N
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ps.getItems()得到已分页好的结果集 \{>eOD_
ps.getIndexes()得到分页索引的数组 f[@#7,2~M
ps.getTotalCount()得到总结果数 ^<9)"9)m_
ps.getStartIndex()当前分页索引 (46U|P(v
ps.getNextIndex()下一页索引 F*<Ws;j
ps.getPreviousIndex()上一页索引 #NF+UJYJ&'
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 \>[gl!B_Rr
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 @7|)RSBQz
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一下代码重构了。 r %xB8e9
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我把原本我的做法也提供出来供大家讨论吧: mt .,4
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首先,为了实现分页查询,我封装了一个Page类: +-k`x0v
java代码: /O"0L/hc^
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/*Created on 2005-4-14*/ SD I,M
package org.flyware.util.page; *<3iEeO/R
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/** 1
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* @author Joa _^3@PM>
* A?V<l<EAm
*/ faJ8zX
publicclass Page { Z{16S=0
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/** imply if the page has previous page */ G[B*TM6$
privateboolean hasPrePage; Faw. GU
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/** imply if the page has next page */ /K&