Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ^X?[zc GE
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ZuE0'9
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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 \2LCpN
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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 !K@yB)9
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分页支持类: y}3V3uqK
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java代码:
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package com.javaeye.common.util; %? g]{
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import java.util.List; :DZiDJ@
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publicclass PaginationSupport { fY `A
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publicfinalstaticint PAGESIZE = 30; FX'W%_f,
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privateint pageSize = PAGESIZE; [;b9'7j'
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privateList items; ;J_d%
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privateint totalCount; B[*i}k%i
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privateint[] indexes = newint[0]; RXP"v-
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privateint startIndex = 0; %1lLUgf3G/
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public PaginationSupport(List items, int a(
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totalCount){ 'dg OE
setPageSize(PAGESIZE); 6-^+btl)#
setTotalCount(totalCount); c=K M[s.
setItems(items); 4Pt0^;H&jn
setStartIndex(0); D`gY6wX
} :4A^~+J
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public PaginationSupport(List items, int I7TMv.
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totalCount, int startIndex){ `j2z=5
setPageSize(PAGESIZE); 6m{3GKaW~
setTotalCount(totalCount); 63~i6
setItems(items); \ pq]q
setStartIndex(startIndex); i.#s'm.9
} IQ|~d08}
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public PaginationSupport(List items, int \0:l9;^4
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totalCount, int pageSize, int startIndex){ `aUA_"f
setPageSize(pageSize); i^W\YLE
setTotalCount(totalCount); .d*v fE$
setItems(items); 2{qoWys8[
setStartIndex(startIndex); aJfW75C
} sI.Ezuw
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publicList getItems(){ )h/fr|
return items; >sP;B5S
} 3}vlj:L
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publicvoid setItems(List items){ `,|7X]%b
this.items = items; 5H5<ft,
} dW=]|t&
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publicint getPageSize(){ <vAg\Tv:S
return pageSize; m3,v&Z
} Rk'pymap
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publicvoid setPageSize(int pageSize){ c-3? D;
this.pageSize = pageSize; 'tdjPdw
} 18`?t_8g
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publicint getTotalCount(){ {:"bX~<^
return totalCount; d)
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} "{&!fD~w
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publicvoid setTotalCount(int totalCount){ J4JKAv~3
if(totalCount > 0){ Y`_6Ny="
this.totalCount = totalCount; -PX {W)Aw
int count = totalCount / :JOF!Q
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pageSize; _qGkTiP
if(totalCount % pageSize > 0) 6 g!t1%Kb
count++; d6Z;\f7[
indexes = newint[count]; ;Z8K3p
for(int i = 0; i < count; i++){ o|UZdGu
indexes = pageSize * Bkcs4 x
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} T+gqu
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}else{ * %MY. #
this.totalCount = 0; GB{%4)%6
} _|#)tWy}
} Bt.WRRpAB
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publicint[] getIndexes(){ tewC *%3V
return indexes; e}Db-7B_~
} +4@EJRC
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publicvoid setIndexes(int[] indexes){ P ^D\znvc
this.indexes = indexes; No h*1u*
} yDHH05Yl
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publicint getStartIndex(){ [rf.P'p%
return startIndex; w
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} z S^:Ng5
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publicvoid setStartIndex(int startIndex){ h>fY'r)DAx
if(totalCount <= 0) T]0qd^\4w
this.startIndex = 0; +.zriiF]i
elseif(startIndex >= totalCount) D VC};
this.startIndex = indexes uu'~[SZlL
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[indexes.length - 1]; [5,#p$R
elseif(startIndex < 0) 7q(RQQp
this.startIndex = 0; >y2gfD
else{ g<tr |n
this.startIndex = indexes Y>IEB,w
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[startIndex / pageSize]; \# #~Tq
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} @C?RbTHy
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publicint getNextIndex(){ mgg/i@(
int nextIndex = getStartIndex() + 0*+i~g,Kl@
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pageSize; -MeGJX:^I
if(nextIndex >= totalCount) O,hT<
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return getStartIndex(); 2jaR_``=:
else /SjA;c!.
return nextIndex; {&m^*YN/
} 3Ju<jXoo!
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publicint getPreviousIndex(){ )$Mgp*?
int previousIndex = getStartIndex() - Ia[e7
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pageSize; >12phLu
if(previousIndex < 0) `n$pR8TZ_
return0; LKTIwb>
else ss.wX~I
return previousIndex; XB^o>/|@S
} ;QS-a
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} l(*`,-pv:
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抽象业务类 ZI}7#K<9X
java代码: e'p'{]r<w
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/** 3N[t2Y1r
* Created on 2005-7-12 FG:(H0
*/ pFx7URZA
package com.javaeye.common.business; 5v6*.e'p
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import java.io.Serializable; &KmVtj
import java.util.List; }[\l$sS
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import org.hibernate.Criteria; UXvUU^k"v
import org.hibernate.HibernateException; I^emH+!MW
import org.hibernate.Session; ~#C7G\R
import org.hibernate.criterion.DetachedCriteria; 9-5H~<}fF
import org.hibernate.criterion.Projections; 4v_<<l
import FxW~Co
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org.springframework.orm.hibernate3.HibernateCallback; jEo)#j];`<
import 59 R;n.Q
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org.springframework.orm.hibernate3.support.HibernateDaoS i]Njn k
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upport; $qV, z
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import com.javaeye.common.util.PaginationSupport; \C#XKk$OE
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public abstract class AbstractManager extends Y{ijSOl3
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HibernateDaoSupport { yb\T<*
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privateboolean cacheQueries = false; dG2k4 O
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privateString queryCacheRegion; aA7}>
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publicvoid setCacheQueries(boolean K&3,J7&&
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cacheQueries){ '1+s^Q'pc
this.cacheQueries = cacheQueries; d| ;S4m`
} f#f<Ii
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publicvoid setQueryCacheRegion(String piULIZ0
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queryCacheRegion){ Se{x-vn?p
this.queryCacheRegion = z@Pv~"
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queryCacheRegion; ?71?Vd
} l!qhK'']V"
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publicvoid save(finalObject entity){ lY
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getHibernateTemplate().save(entity); 3dheT}XV?p
} UTwXN |'|
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publicvoid persist(finalObject entity){ ,a
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getHibernateTemplate().save(entity); g\%;b3"#
} PDQEI55
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publicvoid update(finalObject entity){ B8.a#@R
getHibernateTemplate().update(entity); Fj;];1nt
} CiF(
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publicvoid delete(finalObject entity){ Jui:Ms
getHibernateTemplate().delete(entity); }$%j} F{
} BA(erf>
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publicObject load(finalClass entity, *uW l 804
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finalSerializable id){ e%[0
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return getHibernateTemplate().load !$n@-
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(entity, id); fVJlA
} 3V uoDmG
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publicObject get(finalClass entity, R.x^
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finalSerializable id){ nSy{{d
return getHibernateTemplate().get RISDjU3
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(entity, id); 8FT]B/^&m
} {&dbxj-'
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publicList findAll(finalClass entity){ Fc&3tw"g
return getHibernateTemplate().find("from 76::X:76
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" + entity.getName()); `D-P}hDm!
} 2JdzeJb
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publicList findByNamedQuery(finalString A>\5fO
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namedQuery){ |VX )S!
return getHibernateTemplate &u+l`F^Z
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().findByNamedQuery(namedQuery); ~ECIL7,
} =e)t,YVm
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publicList findByNamedQuery(finalString query, zEVQ[y6BcM
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finalObject parameter){ %8O1sF
return getHibernateTemplate W{RZ@3ZY
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().findByNamedQuery(query, parameter); g?.y7!m
} ]SC|%B_*
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publicList findByNamedQuery(finalString query, `' .;U=mF
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finalObject[] parameters){ \E(^<Af
return getHibernateTemplate ~U r
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().findByNamedQuery(query, parameters); LwlO)|E
}
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publicList find(finalString query){ K/iFB
return getHibernateTemplate().find :
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(query); \wV^uS
} O=[Q>\p
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publicList find(finalString query, finalObject ["fUSQ
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parameter){ ))%f"=:wt
return getHibernateTemplate().find ,&~-Sq)~
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(query, parameter); A`~R\j
} $l $p|
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public PaginationSupport findPageByCriteria 3D-0
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(final DetachedCriteria detachedCriteria){ b/{$#[oP`
return findPageByCriteria s\zY^(v4
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); =Vm3f^
} 0u;a*#V @
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public PaginationSupport findPageByCriteria S{m:Iij[;
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(final DetachedCriteria detachedCriteria, finalint wz..
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startIndex){ aUF{57,<
return findPageByCriteria &S=Qu?H
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(detachedCriteria, PaginationSupport.PAGESIZE, gR+P!Eow
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startIndex); hg%iv%1B'
} 8J#x B
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public PaginationSupport findPageByCriteria We++DWp
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(final DetachedCriteria detachedCriteria, finalint O>N/6Z
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pageSize, 8BrC@L2E0
finalint startIndex){ GEvx<:
return(PaginationSupport) 1Ys)b[:
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getHibernateTemplate().execute(new HibernateCallback(){ ?S;z!)
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publicObject doInHibernate <:!E'WT#f
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(Session session)throws HibernateException { *
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Criteria criteria = r$v\ \^?2
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detachedCriteria.getExecutableCriteria(session); ]x).C[^
int totalCount = &zd@cr1
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((Integer) criteria.setProjection(Projections.rowCount oxBTm|j7
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()).uniqueResult()).intValue(); 9@ 4]t6h[
criteria.setProjection x+DETRLP
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(null); !?R#e`}
List items = k`o8(zPb
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criteria.setFirstResult(startIndex).setMaxResults H |
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(pageSize).list(); A;5_/ 2
PaginationSupport ps = Hs$HeAp;
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new PaginationSupport(items, totalCount, pageSize, _u""v
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startIndex); yN)(MmX'1
return ps; )3A+Ell`
} eIy:5/s
}, true); fs yVu|G
} w_V A:]j4
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public List findAllByCriteria(final [ #ih
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DetachedCriteria detachedCriteria){ giH#t< )W
return(List) getHibernateTemplate Zn0a)VH%
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().execute(new HibernateCallback(){ "N">RjJ"
publicObject doInHibernate U'msHF
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(Session session)throws HibernateException { </Y(4Xwf=
Criteria criteria = }t"K(oamm
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detachedCriteria.getExecutableCriteria(session); R|^bZf^
return criteria.list(); 8KN3|)
} QgKR=GR6
}, true); (&87 zk
} *DvX||`&
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public int getCountByCriteria(final Nmd{C(^o
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DetachedCriteria detachedCriteria){ $&qLrKJ
Integer count = (Integer)
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getHibernateTemplate().execute(new HibernateCallback(){ ZXL'R|?
publicObject doInHibernate
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(Session session)throws HibernateException { 5~Ek_B
Criteria criteria = %I9f_5BlT8
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detachedCriteria.getExecutableCriteria(session); :/%Y"0
return <KK.f9^o(
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criteria.setProjection(Projections.rowCount #_x5-?3
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()).uniqueResult(); "wcw`TsK
} 3s|:7
}, true); D"-Wo}"8O'
return count.intValue(); D 5oYcGc
} 9BpxbU+L;
} >Ut: -}CS
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用户在web层构造查询条件detachedCriteria,和可选的 b{,v?7^4
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Q"U%]2@=
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PaginationSupport的实例ps。 ;du},>T$n
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ps.getItems()得到已分页好的结果集 Z*f%R\u
ps.getIndexes()得到分页索引的数组 bcvm]aPu
ps.getTotalCount()得到总结果数 l`l6Y>c*]
ps.getStartIndex()当前分页索引 ^|zag
ps.getNextIndex()下一页索引 qy.$5-e:[9
ps.getPreviousIndex()上一页索引 UCjx
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 %FM26^
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 -BI!ZsC'
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一下代码重构了。 &*'^uCna
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我把原本我的做法也提供出来供大家讨论吧: 6M`gy|"(~
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首先,为了实现分页查询,我封装了一个Page类: hu} vYA7ZH
java代码: :j .:t
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/*Created on 2005-4-14*/ /n(0w`
package org.flyware.util.page; `p9N| V
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/** [;7zg@Sa
* @author Joa 4i{Xs5zk
* <9
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*/ G1w$lc
publicclass Page { AaxQBTB
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/** imply if the page has previous page */ ~XP|dn}
privateboolean hasPrePage; 7S
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/** imply if the page has next page */ $#+D:W)az
privateboolean hasNextPage; 7g]mrI@
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/** the number of every page */ "_LqIW1
privateint everyPage; HfhI9f_ x
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/** the total page number */ ~GX
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privateint totalPage; oy#(]K3`O
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/** the number of current page */ &+@`Si=
privateint currentPage; a%U#PF6
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/** the begin index of the records by the current (B$>o.(JA
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query */ T(Q ~b
privateint beginIndex; dmXfz D
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/** The default constructor */ J
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public Page(){ l3ogMRq@
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} "0Z/|&
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/** construct the page by everyPage GRYw_}Aa
* @param everyPage Rvu5#_P
* */ %Rf9KQ
public Page(int everyPage){ 60{DR >S
this.everyPage = everyPage; $V`1<>4
} csLbzDg
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/** The whole constructor */ KMkD6g
public Page(boolean hasPrePage, boolean hasNextPage, RD)Vb$.B:
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int everyPage, int totalPage, /bo=,%wJ[
int currentPage, int beginIndex){ b\H&E{Gn|x
this.hasPrePage = hasPrePage; (M1YOK) I
this.hasNextPage = hasNextPage; M_UmnqN1C
this.everyPage = everyPage; "5k6FV
this.totalPage = totalPage; *A8*FX>\F
this.currentPage = currentPage; &}Wi@;G]2
this.beginIndex = beginIndex; 9M7P|Q
} #yR&|*@
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/** l#T%N@X
* @return psmDGSm,&
* Returns the beginIndex. Or?c21un
*/ )V>OND
publicint getBeginIndex(){ |hi,]D^Kc
return beginIndex; fVY I
} q'+ARW48
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/** DMsqTB`
* @param beginIndex !e<2o2~.
* The beginIndex to set. z8"1*V
*/ _<mY|
publicvoid setBeginIndex(int beginIndex){ ?t6wozib2
this.beginIndex = beginIndex; {*hvzS{1d
} e~(e&4pb
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/** [o(!/38"@=
* @return D=3Z] 'A
* Returns the currentPage. H<fi,"X^
*/ U _A'/p^D
publicint getCurrentPage(){ vdgK3I
return currentPage; @|t]9
} w0j'>4
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/** UcB&