Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 c=\H&x3X
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 [n9X5qG~
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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 AU/L_hg
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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 b:>t1S Ul
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分页支持类: xO` O$ie
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java代码: \>GHc}
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package com.javaeye.common.util; dd@-9?6M
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import java.util.List; S2EeC&-AR
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publicclass PaginationSupport { I~P]_DmM
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publicfinalstaticint PAGESIZE = 30; BD (
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privateint pageSize = PAGESIZE; &^!vi2$5}
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privateList items; 9H4NvB{
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privateint totalCount; h
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privateint[] indexes = newint[0]; b )mU9
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privateint startIndex = 0; gu~F(Fb'
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public PaginationSupport(List items, int 8LM 91
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totalCount){ +8\1.vY
setPageSize(PAGESIZE); pN
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setTotalCount(totalCount); _R?:?{r,
setItems(items); Nn%[J+F
setStartIndex(0); ^dF?MQA<@
} >SR!*3$5
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public PaginationSupport(List items, int [Q5>4WY
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totalCount, int startIndex){ =6N%;2`84
setPageSize(PAGESIZE); SZ[,(h
setTotalCount(totalCount); fxKhe[;
setItems(items); B5iVT<:a
setStartIndex(startIndex); .+ w#n<
} 3h-C&C
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public PaginationSupport(List items, int #M5R>&?Jqz
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totalCount, int pageSize, int startIndex){ L6-zQztn
setPageSize(pageSize); 2MapB*
setTotalCount(totalCount); YAvOV-L
setItems(items); D|`I"N[<
setStartIndex(startIndex); ^mA ^7jB
} (`
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publicList getItems(){ d/fg
return items; gh{Z=_
} 6ofi8(n[
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publicvoid setItems(List items){ 5A~lu4-q
this.items = items; HoIK^t~VT#
} TC%ENxDR
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publicint getPageSize(){ ;MH<T6b
return pageSize; 6/Pw'4H9$
} hrRkam !y
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publicvoid setPageSize(int pageSize){ l*`2EJ
this.pageSize = pageSize; MY[QYBkn}
} ,'E+f%
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publicint getTotalCount(){ y]5c!N %8
return totalCount; #BK3CD(&
} 2Bf]#l{z
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publicvoid setTotalCount(int totalCount){ $T)EJe
if(totalCount > 0){ rk$$gXg9/
this.totalCount = totalCount; z ]@ Q
int count = totalCount / bh9!OqK9K
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pageSize; dZ1/w0<M2
if(totalCount % pageSize > 0) rX-V0
count++; 0pYCh$TL1
indexes = newint[count]; 7NY9UQ
for(int i = 0; i < count; i++){ _|!FhZ
indexes = pageSize * jgfl|;I?pg
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} L1'#wH
}else{ ^+hqGu]M
this.totalCount = 0; U=<d;2N#
} X~`<ik{q
} *Z+8L*k97
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publicint[] getIndexes(){ ]Ywj@-*q
return indexes; SP,#KyWP0)
} UY)e6 Zd
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publicvoid setIndexes(int[] indexes){ nMniHB'
this.indexes = indexes; w;RG*rv
} w _*|u
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publicint getStartIndex(){ O[tOpf@s.
return startIndex; ]Tb ?k+a
} Vh.9/$xQ
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publicvoid setStartIndex(int startIndex){ rM
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if(totalCount <= 0) [%8t~zg
this.startIndex = 0; V8aLPJ0_
elseif(startIndex >= totalCount) eC9nOwp]xH
this.startIndex = indexes h;^H*Y&`
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[indexes.length - 1]; 3M;[.b
elseif(startIndex < 0) FXHcy:)}G
this.startIndex = 0; {Q&@vbw'
else{ zjzW;bo( d
this.startIndex = indexes Y55Yo5<j/+
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[startIndex / pageSize]; cZ!%#Az
} %|6t\[gn
} &I&:
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publicint getNextIndex(){ `*A!vO8
int nextIndex = getStartIndex() + 5BL4VGwJ
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pageSize; $*%ipD}f
if(nextIndex >= totalCount) HF3W,eaqK
return getStartIndex(); b
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else xHA6
return nextIndex; b"au9:F4@7
} IEx`W;V]K
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publicint getPreviousIndex(){ syEWc(5
int previousIndex = getStartIndex() - R3HfE*;Z
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pageSize; 36NENzK
if(previousIndex < 0) JAjXhk<=
return0; !N`$`qAK
else G lz0`z
return previousIndex; "Y9PS_u(~
} }`O_
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} our$Ka31
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抽象业务类 ^yO+-A2zC
java代码: wkO8
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/** Ft7{P.g
* Created on 2005-7-12 x1gf o!BN
*/ -QUr|:SK:
package com.javaeye.common.business; ,qx;kJJ
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import java.io.Serializable; (8[et m
import java.util.List; ;*3OkNxa3
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import org.hibernate.Criteria; ` )9nBZ
import org.hibernate.HibernateException; 4K_ fN
import org.hibernate.Session; H`js1b1n
import org.hibernate.criterion.DetachedCriteria; IfGmA.O
import org.hibernate.criterion.Projections; 6;LM1
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import l3d^V&Sk
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org.springframework.orm.hibernate3.HibernateCallback; 5 A/[x$q
import Fk:yj 4'
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org.springframework.orm.hibernate3.support.HibernateDaoS !>~W5c^
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upport; b(hnou S
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import com.javaeye.common.util.PaginationSupport; [d(@lbV0
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public abstract class AbstractManager extends IZ<d~ [y
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HibernateDaoSupport { 7^{M:kYC!
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privateboolean cacheQueries = false; o%!8t_1mR
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privateString queryCacheRegion; Jj<UtD+
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publicvoid setCacheQueries(boolean TRQ@=.
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cacheQueries){ QB<9Be@e
this.cacheQueries = cacheQueries; 3GH@|id
} wVI 1sR
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publicvoid setQueryCacheRegion(String mSn>
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queryCacheRegion){ Ca: jN0
this.queryCacheRegion = j,q8n`@
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queryCacheRegion; y*Egt `W
} #6XN_<
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publicvoid save(finalObject entity){ 54TW8y `h
getHibernateTemplate().save(entity); k{*IR
} &WSxg&YG)\
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publicvoid persist(finalObject entity){
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getHibernateTemplate().save(entity); 8PQn=k9
} ~m
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publicvoid update(finalObject entity){ )!h(o R
getHibernateTemplate().update(entity); 7j9:s>D
} Yx- 2ux
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publicvoid delete(finalObject entity){ 'cs!(z-{x
getHibernateTemplate().delete(entity); KO`ftz3 +
} UL81x72O
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publicObject load(finalClass entity, Dg^n`[WO
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finalSerializable id){ _j$"fg
return getHibernateTemplate().load k z|2PP
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(entity, id); p0 @,-
} Nm{\?
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publicObject get(finalClass entity, cC{eu[ XW
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finalSerializable id){ up[9L|
return getHibernateTemplate().get Gp0H[-oF
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(entity, id); VR86ok
} /.Yf&2X\
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publicList findAll(finalClass entity){ "m*.kB)e7
return getHibernateTemplate().find("from ~r<@`[-L
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" + entity.getName()); XCCh*qym
} 9`83cL
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publicList findByNamedQuery(finalString VMry$
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namedQuery){ Lk?%B)z
return getHibernateTemplate Y ^s_v_s
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().findByNamedQuery(namedQuery); A1b</2
} qJjXN+/D
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publicList findByNamedQuery(finalString query, Yt]tRqrh;T
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finalObject parameter){ {M`yYeo
return getHibernateTemplate 9g*O;0 uz
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().findByNamedQuery(query, parameter); $]V,H"
} PUt\^ke
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publicList findByNamedQuery(finalString query, 4o+SSS
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finalObject[] parameters){ #6t 4 vJ1
return getHibernateTemplate "r!>p\.0O
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().findByNamedQuery(query, parameters); nkI+"$Rz0
} p`/"e<TP
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publicList find(finalString query){
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return getHibernateTemplate().find 9Fo00"q
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(query); ;^XF;zpg
} T1$fu(f
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publicList find(finalString query, finalObject |l4tR
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parameter){ -^1}J
return getHibernateTemplate().find hv)>HU&
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(query, parameter); tcDWx:Q
} t0*kL.
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public PaginationSupport findPageByCriteria se|>P=/
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(final DetachedCriteria detachedCriteria){ `IP?w&k)
return findPageByCriteria iA~LH6
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); :;Lt~:0b~
} CbvP1*1
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public PaginationSupport findPageByCriteria xq6
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(final DetachedCriteria detachedCriteria, finalint :n#8/'%1
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startIndex){ ;(&$Iw9X
return findPageByCriteria X8}m
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(detachedCriteria, PaginationSupport.PAGESIZE, UL{+mp
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startIndex); 1c5+XCr
} +3>)r{#k
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public PaginationSupport findPageByCriteria ?;GbK2\bj
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(final DetachedCriteria detachedCriteria, finalint .<m${yU{3
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pageSize, !.2tv
finalint startIndex){ =3h?!$#?
return(PaginationSupport) DOaTp f
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getHibernateTemplate().execute(new HibernateCallback(){ d4ga6N3'
publicObject doInHibernate 9"W 3t]
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(Session session)throws HibernateException { "[wkjNf%
Criteria criteria = ~U;M1>
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detachedCriteria.getExecutableCriteria(session); w3n6md
int totalCount = `49: !M$i
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((Integer) criteria.setProjection(Projections.rowCount c-jE1y<
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()).uniqueResult()).intValue(); zIzL7oD
criteria.setProjection Y)O88C
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(null); k)3b0T@b
List items = 2_/H,
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criteria.setFirstResult(startIndex).setMaxResults >z'T"R/
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(pageSize).list(); <`Xt?K
PaginationSupport ps = ^P!(*k#T
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new PaginationSupport(items, totalCount, pageSize, ngt?9i;N
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startIndex); Z|#G+$"QV
return ps; htuYctu`
} euMJ c
}, true); #Dz. 58A
} 4)Bk:K
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public List findAllByCriteria(final i5*BZv>e
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DetachedCriteria detachedCriteria){ yI{4h $c
return(List) getHibernateTemplate `o4%UkBpM
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().execute(new HibernateCallback(){ .A Dik}o
publicObject doInHibernate "C]v
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(Session session)throws HibernateException { ;hV-*;>
Criteria criteria = ,I2x&Ys&.
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detachedCriteria.getExecutableCriteria(session); Hk 0RT%PK
return criteria.list(); {3* Ne /
} r`\6+ Ntb.
}, true); d)WGI
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} Ajm
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public int getCountByCriteria(final H5eGl|Z5]^
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DetachedCriteria detachedCriteria){
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Integer count = (Integer) vNDf1B5z
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getHibernateTemplate().execute(new HibernateCallback(){ ,%T
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publicObject doInHibernate 4[lym,8C
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(Session session)throws HibernateException { OTj
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Criteria criteria = l9Av@|
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detachedCriteria.getExecutableCriteria(session); 6n?0MMtR
return Wx` $hvdq
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criteria.setProjection(Projections.rowCount c }7gHud
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()).uniqueResult(); u.@B-Pf[Eo
} x+bC\,q
}, true); @@3%lr71
return count.intValue(); MP|$+yuR~
} s?Z{LWZ@
} p_B5fm7#6W
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用户在web层构造查询条件detachedCriteria,和可选的 B'-n
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 =/+f3
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PaginationSupport的实例ps。 -4v2]
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ps.getItems()得到已分页好的结果集 no,b_0@N
ps.getIndexes()得到分页索引的数组 {Rz(0oD\
ps.getTotalCount()得到总结果数 X?$"dqA
ps.getStartIndex()当前分页索引 7S{yKS
ps.getNextIndex()下一页索引 pS~=T}o
ps.getPreviousIndex()上一页索引 2AXf'IOqE
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 \gGTkH
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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 Aj*|r
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一下代码重构了。 f_z]kA
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我把原本我的做法也提供出来供大家讨论吧: E/hO0Ox6
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首先,为了实现分页查询,我封装了一个Page类: $#-O^0D
java代码: @6Z6@Pq(xQ
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/*Created on 2005-4-14*/ {XH3zMk[
package org.flyware.util.page; k !V@Q!>,
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/** Q"QZ^!zRl
* @author Joa pwVaSnre`
* 39bw,lRPV
*/ @2~;)*
publicclass Page { M Al4g+es
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/** imply if the page has previous page */ PU-L,]K
privateboolean hasPrePage; '3=@UBs
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/** imply if the page has next page */ /<k]mY cu
privateboolean hasNextPage; m>f8RBp]'
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/** the number of every page */ 32p9(HQ
privateint everyPage; 7.tIf
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/** the total page number */ <q`|,mc
privateint totalPage; GsoD^mjY
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/** the number of current page */ [$@EQ]tt/
privateint currentPage; M9.FtQhK/
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/** the begin index of the records by the current 'yR\%#s6
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query */ $U"pdf
privateint beginIndex; W)AfXy
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/** The default constructor */ -Np}<O`./
public Page(){ y?UB?2VN
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} zFr#j~L"
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/** construct the page by everyPage EKUiX#p:M
* @param everyPage /H$:Q|T}
* */ A&V'WahC@I
public Page(int everyPage){ P} w0=
this.everyPage = everyPage; |<JBoE]3B
} H#3Ma1z
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/** The whole constructor */ Q!(qb
public Page(boolean hasPrePage, boolean hasNextPage, lL,0IfC,
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int everyPage, int totalPage, Qx8O&C?Ti
int currentPage, int beginIndex){ H-3*},9
this.hasPrePage = hasPrePage; usw(]CnH
this.hasNextPage = hasNextPage; !O4)YM
this.everyPage = everyPage; TiKfIv
this.totalPage = totalPage; B.}j1Bb
this.currentPage = currentPage; t')%;N
this.beginIndex = beginIndex; bUe6f,8,
} 0GQKM~|H
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/** or(P?Ro
* @return -HRa6
* Returns the beginIndex. QzY5S0
*/ 2]E i4%jo
publicint getBeginIndex(){ $U'*}S
return beginIndex; VuuF _y;
} oGL2uQXX
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/** 'OU`$K7n
* @param beginIndex S_;m+Ytg
* The beginIndex to set. \*Z:w3;r
*/ 5k;}I|rg %
publicvoid setBeginIndex(int beginIndex){ n`D-?]*
this.beginIndex = beginIndex; m,Mg
} 2^)_XVX1
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/** L$?YbQo7
* @return A~;+P
* Returns the currentPage. 2>)::9e4
*/ ,Y@4d79
publicint getCurrentPage(){ IO"q4(&;P4
return currentPage; yY!@FGsA
} T+>W(w
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/** juMHc$d17
* @param currentPage "5"{~3Gw^
* The currentPage to set. %F(lq*8X
*/ ?>mpUH
publicvoid setCurrentPage(int currentPage){ cK75Chsu
this.currentPage = currentPage; V=E5pB`Pr
} j3fq}>=
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/** w}?,N
* @return 1~S''[
* Returns the everyPage. 0NXaAf:2Z
*/ '\P+Bu]6&
publicint getEveryPage(){ =/19 -Y:
return everyPage; }ok'd=M
} [jTZxH<
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/** {"_V,HmEF+
* @param everyPage Is!+`[ma
* The everyPage to set. 7TA&u'
*/ [pSQ8zdF"
publicvoid setEveryPage(int everyPage){ w +HKvOs5c
this.everyPage = everyPage; *s?C\)x
} yS4nB04`=
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/** R.rE+gxO1
* @return @4>?Y=#
* Returns the hasNextPage. Q7_#k66gb7
*/ Zig3WiD&
publicboolean getHasNextPage(){ 9L>ep&u)^
return hasNextPage; uExYgI`<%&
} 5yf`3vV|3@
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/** $SU<KNMZ
* @param hasNextPage \o5/, C
* The hasNextPage to set. IW=%2n(<1
*/ bK|nxL
publicvoid setHasNextPage(boolean hasNextPage){ $Q`\-
this.hasNextPage = hasNextPage; \n-.gG
} ES5a`"H
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/** nz Klue
* @return j^D/,SW
* Returns the hasPrePage. 7
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*/ :~~\{fm
publicboolean getHasPrePage(){ g8]$BhRIfr
return hasPrePage; BWzo|isv
} GX N:=
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/** XW*d\vDun
* @param hasPrePage 1(/rg
* The hasPrePage to set. }LX.gm
*/ ki]i[cdk
publicvoid setHasPrePage(boolean hasPrePage){ A{gniYqvB`
this.hasPrePage = hasPrePage; g?>
} C{YTHNn
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/** XZxzw*Y1J
* @return Returns the totalPage. Wbi12{C
* 7qg. :h
*/ 6g"qwWZp
publicint getTotalPage(){ <4*)J9V^s=
return totalPage; )Nl xW5
} WU6F-{M"?
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/** Kj+TPqXb
* @param totalPage oi%IHX(`
* The totalPage to set. xgWVxX^)
*/ wArzMt}[
publicvoid setTotalPage(int totalPage){ BsYJIKfW
this.totalPage = totalPage; sl*&.F,v=
} OmaG|2u
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} R'aA\k-
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 ;uqi
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个PageUtil,负责对Page对象进行构造: {?]&