Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 FVl,
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 w^8Q~3|7
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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 O,),0zcYF
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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 H0inU+Ih
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分页支持类: "2%R?
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java代码: :tO?+1
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package com.javaeye.common.util; cd,'37 pZ
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import java.util.List; ='D%c^;O8'
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publicclass PaginationSupport { gNxv.6Pp=
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publicfinalstaticint PAGESIZE = 30; 5K9W5hA:D
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privateint pageSize = PAGESIZE; +&"W:Le:
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privateList items; j,].88H
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privateint totalCount; b/\O;o}]
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privateint[] indexes = newint[0]; )x[=}0C
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privateint startIndex = 0; w7~]c,$y.
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public PaginationSupport(List items, int fXnTqKAfu6
} -4p8Zt
totalCount){ z|AknEE,
setPageSize(PAGESIZE); `m1stK(PO
setTotalCount(totalCount); {=I,+[(
setItems(items); RgFpc*.T
setStartIndex(0); M6cybEk`
} n5xG4.#G
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public PaginationSupport(List items, int B> i^ w1
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totalCount, int startIndex){ C`Vuw|Xl
setPageSize(PAGESIZE); g- #eMQ%J
setTotalCount(totalCount); QP<P,Bi~
setItems(items); moVf(7
setStartIndex(startIndex); +>ituJ
} PNLlJlYlP
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public PaginationSupport(List items, int OdyL
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totalCount, int pageSize, int startIndex){ jyg>'"W
setPageSize(pageSize); gHUW1E
setTotalCount(totalCount); .w\4Th#
setItems(items); a&[[@1OY
setStartIndex(startIndex); &flcJ`
} ~O./A-l
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publicList getItems(){ $aXYtHI
return items; T5 pc%%q
} 2mj>,kS?c
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publicvoid setItems(List items){ UlN}SddI9
this.items = items; /Y\q&}
} #9"lL1
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publicint getPageSize(){ rf$[8d
return pageSize; \2@9k`
} J=^5GfM)J
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publicvoid setPageSize(int pageSize){ tvzO)&)$
this.pageSize = pageSize; hhjsg?4uL
} *X|%H-Q:H`
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publicint getTotalCount(){ FGwgSrXL7
return totalCount; ,V4pFQzL
} QKz2ONV=)
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publicvoid setTotalCount(int totalCount){ z5:3.+M5
if(totalCount > 0){ 6x;"T+BSSS
this.totalCount = totalCount; /KvpJ4
int count = totalCount / TKw>eGe
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pageSize; Grd9yLF
if(totalCount % pageSize > 0) n!b*GXb\
count++; $[=`*m
indexes = newint[count]; Ej VB\6,
for(int i = 0; i < count; i++){ OK}8BY
indexes = pageSize * gJOswN;([
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} H<b4B$/
}else{ 4f0dc\$
this.totalCount = 0; GEb)nHQq
} |("5 :m
} yNx"Ey dk`
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publicint[] getIndexes(){ 8{Svax(
return indexes; xi\uLu?i
} hi]\M)l&x
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publicvoid setIndexes(int[] indexes){ ^T@-yys
this.indexes = indexes; /_bM~g
} qn\>(&
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publicint getStartIndex(){ B T{({3
return startIndex; 7xT<|3 I
} p@znmn-
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publicvoid setStartIndex(int startIndex){ n_] OYG>U
if(totalCount <= 0) 483vFLnF
this.startIndex = 0; QaEXk5>e
elseif(startIndex >= totalCount) KQqQ@D&n
this.startIndex = indexes naB[0I&
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[indexes.length - 1]; m7mC
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elseif(startIndex < 0) 2,%ne (
this.startIndex = 0; ]gj@r[
else{ .^1=*j(;
this.startIndex = indexes b}G +7B
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[startIndex / pageSize]; 0P53dF
} BQ&h&57K
} gzdgnF2
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publicint getNextIndex(){ 8i"{GGVC
int nextIndex = getStartIndex() + {gi"ktgk
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pageSize; a. 5`Q2
if(nextIndex >= totalCount) ~JT{!wcE}o
return getStartIndex(); e S
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else ;6)|'3.B9
return nextIndex; CnA*o 8w
} zKWi9
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publicint getPreviousIndex(){ anV)$PT=
int previousIndex = getStartIndex() - !8s:3]
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pageSize; !p9F'7;Y<
if(previousIndex < 0) D{z=)'/F
return0; gf@'d.W}
else ?
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return previousIndex; ->#7_W
} @o^sp|k !
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} %I=J8$B]f
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抽象业务类 ,!py
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java代码: =O_[9kuJ
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/** /iQ>he~fy
* Created on 2005-7-12 yq,5M1vR
*/ SO&;]YO
package com.javaeye.common.business; EX5kF
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import java.io.Serializable; QY fS-
import java.util.List; !c`1~a!
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import org.hibernate.Criteria; XF$C)id2p
import org.hibernate.HibernateException; bU,&|K/
import org.hibernate.Session; BPOWo8TqD^
import org.hibernate.criterion.DetachedCriteria; ) D`_V.,W
import org.hibernate.criterion.Projections; BZ T%+s;u9
import wb9zJAsc
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org.springframework.orm.hibernate3.HibernateCallback; (6+0U1[Iz
import Ek.j@79
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org.springframework.orm.hibernate3.support.HibernateDaoS 5LK>n-
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upport; \%VoX`B
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import com.javaeye.common.util.PaginationSupport; 3G&1. 8
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public abstract class AbstractManager extends p 5'\< gQ
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HibernateDaoSupport { %~[F^
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privateboolean cacheQueries = false; OWkK]O
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privateString queryCacheRegion; [6tQv<}^
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publicvoid setCacheQueries(boolean ={oO9.9
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cacheQueries){ m1hf[cg
this.cacheQueries = cacheQueries; `jkn*:m
} }bTMeCgI
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publicvoid setQueryCacheRegion(String #75;%a8
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queryCacheRegion){ tpctz~ .
this.queryCacheRegion = *dl@)~i
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queryCacheRegion; ] ge-b\
} N!3f1d7RQ
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publicvoid save(finalObject entity){ Pg36'aTe%j
getHibernateTemplate().save(entity); /P%:u0fX,
} >JMKEHl.q
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publicvoid persist(finalObject entity){ I|:j~EY
getHibernateTemplate().save(entity); aU! UY(
} G~Sfpf
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publicvoid update(finalObject entity){ ;D7jE+
getHibernateTemplate().update(entity); A!~o?ej
} g/J!U8W"
@wPmx*SF
publicvoid delete(finalObject entity){ l9h;dI{6
getHibernateTemplate().delete(entity); =EJ"edw]%0
} \4[Ta,;t
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publicObject load(finalClass entity, U8mu<)
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finalSerializable id){ 8FITcK^
return getHibernateTemplate().load A0ToX) |C
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(entity, id); ;a`X|N9
} ao!r6:&v$e
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publicObject get(finalClass entity, @6SSk=9_S
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finalSerializable id){ @n(In$
return getHibernateTemplate().get YB|9k)Z2[
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(entity, id); $%-?S]6)
} =!X4j3Cv
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publicList findAll(finalClass entity){ EUkNh>U?
return getHibernateTemplate().find("from =)8Ct
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" + entity.getName()); _;{-w%Vf
} (YOgQ)},
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publicList findByNamedQuery(finalString h(-&.Sm")H
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namedQuery){ i.] zq
return getHibernateTemplate 'Ot[q^,KRG
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().findByNamedQuery(namedQuery); 0Pk-FSY|f
} Izu.I_$4
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publicList findByNamedQuery(finalString query, U:9vjY
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finalObject parameter){ ?
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return getHibernateTemplate D,/9rH
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().findByNamedQuery(query, parameter); A2d2V**Z
} ]Yex#K
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publicList findByNamedQuery(finalString query, D.b<I79bX
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finalObject[] parameters){ MVdx5,t
return getHibernateTemplate :N}KScS|Wa
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().findByNamedQuery(query, parameters); cG:`Zj~4
} CdO-xL6F
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publicList find(finalString query){ l0{DnQA>I
return getHibernateTemplate().find P}`1#$
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(query); }i:'f2/
} 0)!zhO_}
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publicList find(finalString query, finalObject "S:N-Tf%U
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parameter){ 'wrpW#
return getHibernateTemplate().find tqCg<NH.!m
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(query, parameter); KT71%?P
} (q N(#~
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public PaginationSupport findPageByCriteria bf/loMtD
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(final DetachedCriteria detachedCriteria){ XD }_9p
return findPageByCriteria eB*8)gYh
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); |$2N$6\SP
} sEyl\GL
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public PaginationSupport findPageByCriteria TP::y
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(final DetachedCriteria detachedCriteria, finalint h+D=/:B
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startIndex){ Cl!jK^AbG
return findPageByCriteria wtS*w
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(detachedCriteria, PaginationSupport.PAGESIZE, CJ
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startIndex); /8\&f%E
} +Uq:sfj,
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public PaginationSupport findPageByCriteria /ASI0h
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(final DetachedCriteria detachedCriteria, finalint 3G|fo4g
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pageSize, +lJ]-U|P
finalint startIndex){ 8T
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return(PaginationSupport) Eo&qc 17)`
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getHibernateTemplate().execute(new HibernateCallback(){ y|{?>3
publicObject doInHibernate `+c9m^
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(Session session)throws HibernateException { Z8 %\v(L
Criteria criteria = TR_oI<xB2
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detachedCriteria.getExecutableCriteria(session); .WyX/E$I^!
int totalCount = =[os<+
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((Integer) criteria.setProjection(Projections.rowCount bCUh^#]x
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()).uniqueResult()).intValue(); 3MJWC o-[
criteria.setProjection %MZDm&f>Kk
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(null); Yka&Kkw
List items = \ZWmef
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criteria.setFirstResult(startIndex).setMaxResults @ ]wem
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(pageSize).list(); M;V#Gm
PaginationSupport ps = s^'#"`!v=
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new PaginationSupport(items, totalCount, pageSize, .t[ZXrd|0
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startIndex); 6-14Htsk6
return ps; 4Olv8nOe<
} aw%vu
}, true); P3ev4DL
} L4*fF
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public List findAllByCriteria(final Tc5OI' -V
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DetachedCriteria detachedCriteria){ ,h.Jfo54,
return(List) getHibernateTemplate hs_|nr0;[
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().execute(new HibernateCallback(){ @^6OV)
publicObject doInHibernate C|IQM4
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(Session session)throws HibernateException { =k<4mlok^
Criteria criteria = #s
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detachedCriteria.getExecutableCriteria(session); {^5<{j3e
return criteria.list();
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} uNZ>oP>
}, true); ^
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} XAxI?y[c
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public int getCountByCriteria(final S Y>,kwHO
@TPgA(5NR
DetachedCriteria detachedCriteria){ $0S#d@v}
Integer count = (Integer) vJAAAS
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getHibernateTemplate().execute(new HibernateCallback(){ Sb9=$0%\
publicObject doInHibernate '7LJuMp$#
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(Session session)throws HibernateException { t,1! `/\
Criteria criteria = 5QFXj)hR+4
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detachedCriteria.getExecutableCriteria(session); s]<r
return fy=C!N&/
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criteria.setProjection(Projections.rowCount $N+{r=
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()).uniqueResult(); 0H&U=9'YT
} XvkI+c
}, true); d7tD|[(J
return count.intValue(); o- QG&
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} K!D!b'|bb
} LVFsd6:h
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用户在web层构造查询条件detachedCriteria,和可选的 U>_\
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 6n6VEwYj
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PaginationSupport的实例ps。
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ps.getItems()得到已分页好的结果集 CX ]\Q-y
ps.getIndexes()得到分页索引的数组
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ps.getTotalCount()得到总结果数 fzFvfMAU
ps.getStartIndex()当前分页索引 R4~zL!7;
ps.getNextIndex()下一页索引 JfP\7
ps.getPreviousIndex()上一页索引 @+\S!o3m
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 l@Eq|y,
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 Oz#EGjz
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一下代码重构了。 Vyt~OTI\
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我把原本我的做法也提供出来供大家讨论吧: nvs}r%1'5
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首先,为了实现分页查询,我封装了一个Page类: >SxZ9T|%
java代码: @X|i@{<';
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/*Created on 2005-4-14*/ Q{l*62Bx
package org.flyware.util.page; <jRFN&"h}
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/** {r].SrW9s9
* @author Joa mj(&`HRs4
* Mi/ &$"=
*/ e@,u`{C[
publicclass Page { :Hf0Qx6
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/** imply if the page has previous page */ g<rKV+$6
privateboolean hasPrePage;
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/** imply if the page has next page */ 4QjWZ Wl
privateboolean hasNextPage; /\-2l+y>J
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/** the number of every page */ x'M^4{4[
privateint everyPage; y3KcM#[
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/** the total page number */ s=nVoc{Yt
privateint totalPage; ,h@R' f!
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/** the number of current page */ gP%|:"
privateint currentPage; znQ'm^ h
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/** the begin index of the records by the current S}m$,<x
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query */ %CxEZPe$
privateint beginIndex; sMz^!RX@
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/** The default constructor */ J~iOP
public Page(){ $/, BJ/9
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} 62MRI
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/** construct the page by everyPage y7M:b Uh
* @param everyPage CrNwALx
* */ `\/toddUh[
public Page(int everyPage){ p- "Z'$A`
this.everyPage = everyPage; Vedyy\TU
} zmB31' _
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/** The whole constructor */ [:nx);\
public Page(boolean hasPrePage, boolean hasNextPage, >k&8el6h
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int everyPage, int totalPage, FpdDIa
int currentPage, int beginIndex){ kfqpI
this.hasPrePage = hasPrePage; e~+(7_2
this.hasNextPage = hasNextPage; f=:3! k,S
this.everyPage = everyPage; wovmy{K
this.totalPage = totalPage; m/YH^N0
this.currentPage = currentPage; >:F,-cx<
this.beginIndex = beginIndex; ?o~:'Z
} @cuD8<\i
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/** $5TepH0D
* @return $=PWT-GIR
* Returns the beginIndex. SUH mBo"}
*/ OuOk=
publicint getBeginIndex(){ k]SAJ~bS|
return beginIndex; Lh8bQH
} =zeFK_S!
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/** .
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* @param beginIndex <`R|a *
* The beginIndex to set. \!+-4,CbZY
*/ [ME}Cv`?<E
publicvoid setBeginIndex(int beginIndex){ u\{qH!?t
this.beginIndex = beginIndex;
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} I#|ocz
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/** ;YK!EMM4!h
* @return u(pdP"
* Returns the currentPage. \C]i|]tl
*/ hD nM+4D
publicint getCurrentPage(){ _\
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return currentPage; Xh.+pJl,*
} {fog<1c
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/** PUbaS{J7
* @param currentPage ^ckj3Y#;
* The currentPage to set. Yv)Bj
*/ )t|^Nuj8
publicvoid setCurrentPage(int currentPage){ iD>G!\&