Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 S<Gm*$[7
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 QCb%d'_w+
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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 Z;81"
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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 l7qW)<r
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分页支持类: ~[t#$2d}
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java代码: ]&]DFY~n
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package com.javaeye.common.util; C&H'?0Y@
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import java.util.List; *$-X&.h[
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publicclass PaginationSupport { ,7Hyrx`
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publicfinalstaticint PAGESIZE = 30; v;o1c44;
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privateint pageSize = PAGESIZE; }rfikm
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privateList items; Ge-Bk)6
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privateint totalCount; ^wd@mWxx
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privateint[] indexes = newint[0]; X'PZCg W
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privateint startIndex = 0; vJ65F6=G
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public PaginationSupport(List items, int 'Y)aGH(
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totalCount){ f|q/2}Bqb
setPageSize(PAGESIZE); >jAFt_
setTotalCount(totalCount); lEFd^@t
setItems(items); x5Lbe5/P
setStartIndex(0); R#4l"
} Z5 IWoY
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public PaginationSupport(List items, int ;F"!$Z/
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totalCount, int startIndex){ W"vLCHTh
setPageSize(PAGESIZE); tjx8UgSi
setTotalCount(totalCount); hXjZ>n``
setItems(items); CLaQE{
setStartIndex(startIndex); <C'_:&M
} kPs?
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public PaginationSupport(List items, int /#Aw7F$Ey
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totalCount, int pageSize, int startIndex){ uH9Vj<E$K
setPageSize(pageSize); O0qG
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setTotalCount(totalCount); [G|.
setItems(items); ``WTg4C(Y
setStartIndex(startIndex); '2r
} f $Agcy
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publicList getItems(){ xO )c23Z)]
return items; c]|vg=W
} F0U %m
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publicvoid setItems(List items){ %`&n ;K.c
this.items = items; p<r<Y%
} 7_1 Iadb
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publicint getPageSize(){ t`K9K"|k
return pageSize; _ Lh0
} _C/|<Ot:
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publicvoid setPageSize(int pageSize){ G7 UUx+ X
this.pageSize = pageSize; ['}|#3*w
} ML12&E>
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publicint getTotalCount(){ XZ
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return totalCount; :.+w'SEn4M
} {:gx*4}q8
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publicvoid setTotalCount(int totalCount){ Zmyq6.1q~
if(totalCount > 0){ kS-BB[T
this.totalCount = totalCount; I_ZJnu<
int count = totalCount / @n)?=[p
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pageSize; {S=<(A@
if(totalCount % pageSize > 0) uQO5GDuK>
count++; m0bxVV^DK!
indexes = newint[count]; r*`e%`HU
for(int i = 0; i < count; i++){ @GKDSS4jv
indexes = pageSize * SiaNL:
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} s1 >8uW
}else{ |URfw5Hm
this.totalCount = 0; %" H:z
} FFw(`[A_
} 1yE',9?
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publicint[] getIndexes(){ kC.dJ2^j+
return indexes; mw 5>[
} W]D YfR,
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publicvoid setIndexes(int[] indexes){ UJ}}H}{
this.indexes = indexes; R@3HlGuRKw
} Y5GN7.
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publicint getStartIndex(){ XE2Un1i}j1
return startIndex; 0cHcBxdF
} Eg`~mE+a
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publicvoid setStartIndex(int startIndex){ QfEJU8/5d
if(totalCount <= 0) <9pI~\@w
this.startIndex = 0; :(~<BiqR(
elseif(startIndex >= totalCount) D=a*Xu2zq
this.startIndex = indexes bW
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[indexes.length - 1]; i\IpS@/{-v
elseif(startIndex < 0) yT/rH- j;5
this.startIndex = 0; 7-B|B{]
else{ rB+ (
this.startIndex = indexes Hj
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[startIndex / pageSize]; ^N<aHFF
} HMUx/M.j
} Vl1.]'p_
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publicint getNextIndex(){ lD$s, hp
int nextIndex = getStartIndex() + 7RUztu\_
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pageSize; J8~hIy6]
if(nextIndex >= totalCount) hD5@PeLh
return getStartIndex(); GcRH$,<XG
else {O _X/y~
return nextIndex; aZ~e;}w.Zq
} @-)S*+8
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publicint getPreviousIndex(){ w]MI3_|'r(
int previousIndex = getStartIndex() - ODu/B'*
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pageSize; :/(G#ZaV
if(previousIndex < 0) IA0vSF:
return0; esSj
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else mfZbo#KS#v
return previousIndex; |iJz[%
} (Yj6|`
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} :j+E]|d(~6
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抽象业务类 x}a?B
java代码: GThGV"
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/** %.
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* Created on 2005-7-12 Ds]
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*/ G--vwvL
package com.javaeye.common.business; %u%;L+0Q[
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import java.io.Serializable; 6T4"m
import java.util.List; 'dwsm7Xd
;
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import org.hibernate.Criteria; 9*iVv)jd
import org.hibernate.HibernateException; 1N _"Mm{
import org.hibernate.Session;
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import org.hibernate.criterion.DetachedCriteria; 4Ty?>'*|
import org.hibernate.criterion.Projections; ;0_T\{H"nR
import %pg)*>P h
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org.springframework.orm.hibernate3.HibernateCallback; w#9.U7@.
import f|~'(~Sr
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org.springframework.orm.hibernate3.support.HibernateDaoS `ci
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upport; n\Is}Czl
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import com.javaeye.common.util.PaginationSupport; k7:ISjJ
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public abstract class AbstractManager extends +q2\3REzx
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HibernateDaoSupport { VKXi*F9
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privateboolean cacheQueries = false; LL:N/1ysG
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privateString queryCacheRegion; UV%o&tv|<
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publicvoid setCacheQueries(boolean :F5(]g 7
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cacheQueries){ fC^d@4ha
this.cacheQueries = cacheQueries; `&a8Wv
} aU +uPP
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publicvoid setQueryCacheRegion(String eiOAbO#U
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queryCacheRegion){ hDJ+Rk@
this.queryCacheRegion = mq<:^
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queryCacheRegion; ^38kxwh
} 9&kY>M>z0
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publicvoid save(finalObject entity){ x2~fc
getHibernateTemplate().save(entity); r_ 9"^Er
} zGO_S\
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publicvoid persist(finalObject entity){ 5-a^Frmg#"
getHibernateTemplate().save(entity); mMZ=9 ?m
} WZA1nzRc
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publicvoid update(finalObject entity){ T8LvdzS
getHibernateTemplate().update(entity); kVWrZ>McK
} '#K~hep
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publicvoid delete(finalObject entity){ %D7^.
getHibernateTemplate().delete(entity); /ORK9g
} KPK`C0mg@k
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publicObject load(finalClass entity, RionKiN
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finalSerializable id){ pdQaVe7tRo
return getHibernateTemplate().load *JW.ca}
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(entity, id); I`{=[.c
} _n*gj-
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publicObject get(finalClass entity, }&ew}'*9)
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finalSerializable id){ dZ,7q_r,~
return getHibernateTemplate().get tr
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(entity, id); 00W_XhJ
} <1V>0[[e
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publicList findAll(finalClass entity){ u7wZPIC{_
return getHibernateTemplate().find("from }
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" + entity.getName()); huin?,eGz
} 2JHF*zvO-
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publicList findByNamedQuery(finalString R'1"`@fG
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namedQuery){ s;[64ca]Q
return getHibernateTemplate :d~&Dt<c
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().findByNamedQuery(namedQuery); %eu_Pr 6X
} (yeN> x}_
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publicList findByNamedQuery(finalString query, RoD9
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finalObject parameter){ v@!r$jZ
return getHibernateTemplate (n{!~'3
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().findByNamedQuery(query, parameter); JdeGQ
} \a\ApD
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publicList findByNamedQuery(finalString query, K Z)p\p<1
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finalObject[] parameters){ pI|H9
return getHibernateTemplate FsYsQ_,R3
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().findByNamedQuery(query, parameters); 55T c
} _~E&?zR2>"
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publicList find(finalString query){ $w$4RQk3n
return getHibernateTemplate().find f#9\&-he0
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(query); Eo }mSd
} aGz<Yip
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publicList find(finalString query, finalObject :2fz4n0{/
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parameter){ G6b\4}E
return getHibernateTemplate().find to
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(query, parameter); :8~*NSEFd
} "3i=kvdz
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public PaginationSupport findPageByCriteria zF[>K4
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(final DetachedCriteria detachedCriteria){ R3$K[Lv,
return findPageByCriteria sc!
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); [yF4_UoF
} J8x>vC
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public PaginationSupport findPageByCriteria :B<lDcFKJ
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(final DetachedCriteria detachedCriteria, finalint 2EOt.4cP
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startIndex){ l*]L=rC
return findPageByCriteria Iky'x[p,D
#isBE}sT{
(detachedCriteria, PaginationSupport.PAGESIZE, c4R6E~S
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startIndex); $ #C$V>
} m.MOn3n]
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public PaginationSupport findPageByCriteria a<[@p
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(final DetachedCriteria detachedCriteria, finalint t`DoTb4
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pageSize, {O6f1LuH
finalint startIndex){ ~PUz/^^
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return(PaginationSupport) bf
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getHibernateTemplate().execute(new HibernateCallback(){ 67Ai.3dR
publicObject doInHibernate G1Cn[F;e
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(Session session)throws HibernateException { YSt' ]
Criteria criteria = -O_5OT4
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detachedCriteria.getExecutableCriteria(session); C CX\"-C
int totalCount = 4ow)vS(
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((Integer) criteria.setProjection(Projections.rowCount !h2ZrT9
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()).uniqueResult()).intValue(); S@zsPzw
criteria.setProjection Nl7"|()e
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(null); ;y?,myO
List items =
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criteria.setFirstResult(startIndex).setMaxResults L^)&"6oSa
j ij:}.d6
(pageSize).list(); ~xu<xy@E
PaginationSupport ps = {y'c*NS
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new PaginationSupport(items, totalCount, pageSize, Fp-d69Npo
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startIndex); 8(D>ws$
return ps; G6Z2[Ej1
} IyYC).wU}
}, true); f>5{SoM
} \A _g
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public List findAllByCriteria(final 5FnWlFc
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DetachedCriteria detachedCriteria){ JMw1qPJQ
return(List) getHibernateTemplate bQb>S<PT
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().execute(new HibernateCallback(){ VLN=9
publicObject doInHibernate v-X1if1%
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(Session session)throws HibernateException { N|T%cdh:/
Criteria criteria = >tqLwC."'
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detachedCriteria.getExecutableCriteria(session); _UYt
return criteria.list();
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} ^:\|6`{n
}, true); b|wCR%
} S-npJh
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public int getCountByCriteria(final pA+W
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DetachedCriteria detachedCriteria){ q*\#HC
Integer count = (Integer) $985q@pV0
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getHibernateTemplate().execute(new HibernateCallback(){ +L!-JrYHS4
publicObject doInHibernate j\("d4n%C
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(Session session)throws HibernateException { 1 +O- g
Criteria criteria = c</d1x T
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detachedCriteria.getExecutableCriteria(session); dOqn0Z
return ~C{d2i
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criteria.setProjection(Projections.rowCount <bWhTNOb
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()).uniqueResult(); AiykIER/
} Rgw\qOb
}, true); #qGfo)
return count.intValue(); t]#y}V
} :t8(w>oW
} `$jc=ZLm
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用户在web层构造查询条件detachedCriteria,和可选的 w-2p'u['Z
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 r]sv50Fy
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PaginationSupport的实例ps。 1D&Q{?RM
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ps.getItems()得到已分页好的结果集 SEq_37
ps.getIndexes()得到分页索引的数组 +u#;k!B/>
ps.getTotalCount()得到总结果数 D'F=v\P
ps.getStartIndex()当前分页索引 UJ1iXV[h"
ps.getNextIndex()下一页索引 Gy
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ps.getPreviousIndex()上一页索引
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 dElOy?v
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 9}Ud'#E
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一下代码重构了。 1P:r=Rt/
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我把原本我的做法也提供出来供大家讨论吧: Gkv<)}G
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首先,为了实现分页查询,我封装了一个Page类: uo;aC$US
java代码: ;,![Lar5L
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/*Created on 2005-4-14*/ Gx
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package org.flyware.util.page; "K
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/** ^m.QW*
* @author Joa {"$
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* /. GHR
*/ 3e4; '5q;
publicclass Page { ,_@C(O
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/** imply if the page has previous page */ .}n,
privateboolean hasPrePage; YUU|!A8x
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/** imply if the page has next page */ =r=[e}&9
privateboolean hasNextPage; b fy `UZr
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/** the number of every page */ _i{$5JJ+K2
privateint everyPage; qI;"yG-x-
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/** the total page number */ hT4u;3xE
privateint totalPage; d MQ]=
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/** the number of current page */ XDs )
privateint currentPage; sk !92mQ
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/** the begin index of the records by the current PhF.\Wb
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