Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 q}PeXXH
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 @,<@y>m7
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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 -Yv0n3
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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 D~~&e<v'1
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分页支持类: b3G4cO;t;
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java代码: Lbka*@
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package com.javaeye.common.util; hlpi-oW`
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import java.util.List; R#ABda9
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publicclass PaginationSupport { j9@7\N<
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publicfinalstaticint PAGESIZE = 30; R^PPgE6!$
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privateint pageSize = PAGESIZE; -kh O4,
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privateList items; 9Ij=~p]p
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privateint totalCount; z+K -aj w
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privateint[] indexes = newint[0]; B\U9F5
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privateint startIndex = 0; TBN0u k
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public PaginationSupport(List items, int x=g=e
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totalCount){ 2sj[hI
setPageSize(PAGESIZE); ^t&S?_DSZ
setTotalCount(totalCount); Q ke8BRBn
setItems(items); }pJ6CW
setStartIndex(0); t6GL/M4
} )[d?&GK
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public PaginationSupport(List items, int 2lVJ"jg
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totalCount, int startIndex){ ~c&ygL3
setPageSize(PAGESIZE); 3;@/`Z_\lt
setTotalCount(totalCount); Yv?nw-HM
setItems(items); !}Sf?nP#
setStartIndex(startIndex); >wz&{9ni
} Gkz\By
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public PaginationSupport(List items, int u^DfRd&P0
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totalCount, int pageSize, int startIndex){ hk
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setPageSize(pageSize); D#ZzhHHP
setTotalCount(totalCount); {:U zW\5l)
setItems(items); O)y|G%O
setStartIndex(startIndex); J<g$hk
} k8!|WqfP
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publicList getItems(){ woCmpCN*I
return items; E+LAE/v@
} \qx$h!<
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publicvoid setItems(List items){ Y$3 &?LA
this.items = items; r5U[jwP
} L *a:j
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publicint getPageSize(){ 5K_KZL-
return pageSize; N/wU P
} X$aN:!1
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publicvoid setPageSize(int pageSize){ x=1Iuc;&3
this.pageSize = pageSize; [$PW {d8|
} N03)G2
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publicint getTotalCount(){
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return totalCount; BE`{? -G
} F E`4%X
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publicvoid setTotalCount(int totalCount){ W7bA#p(
if(totalCount > 0){ ;WydXQ}Q^
this.totalCount = totalCount; eIZ7uSl
int count = totalCount / yQAW\0`
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pageSize; v:2*<;
if(totalCount % pageSize > 0) DhN{Y8'~
count++; s(~tL-_ K
indexes = newint[count]; m2%OX"# e
for(int i = 0; i < count; i++){ B|\pzWD%
indexes = pageSize * 1r!o,0!d-'
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} 6j*L]Sc
}else{ >K|<hzZ
this.totalCount = 0; :Ma=P\J
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} ORVFp]gG
} Ll"
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publicint[] getIndexes(){ $KSdNFtM)A
return indexes; GyirE`
} MHl ffj
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publicvoid setIndexes(int[] indexes){ u'Od~x^z
this.indexes = indexes; @1+gY4g
} _/FpmnaY
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publicint getStartIndex(){ }XOTK^YA
return startIndex; C)x>/Qr ~
} 4Ss4jUj
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publicvoid setStartIndex(int startIndex){ NOC8h\s}(
if(totalCount <= 0) WruSL|4iH
this.startIndex = 0; cSbyVC[r
elseif(startIndex >= totalCount) HPGIz!o
this.startIndex = indexes y7f,]<%e_
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[indexes.length - 1]; E#?Bn5-uBs
elseif(startIndex < 0) 8iv0&91Z
this.startIndex = 0; &c?q#-^)\+
else{ [-ONs
this.startIndex = indexes Q7
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[startIndex / pageSize]; )Y@E5Tuk>
} r6JQRSakR
} H0!LiazA>
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publicint getNextIndex(){ UF_?T.Rl^
int nextIndex = getStartIndex() + *Z9Rl>
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pageSize; hSl6X3W
if(nextIndex >= totalCount) !^[i"F:G
return getStartIndex(); AVn?86ri
else `, lnBP3D"
return nextIndex; wBuos}/
} u&M:w5EM
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publicint getPreviousIndex(){ 6dH> 0l
int previousIndex = getStartIndex() - (+(YQ2
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pageSize; f9%M:cl
if(previousIndex < 0) !t;B.[U *
return0; #<$pl]>}t
else +.czj,Sq
return previousIndex; /8cfdP Ba
} Z2t'?N|_
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} vtByC u5
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抽象业务类 dmB
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java代码: KUV(vAY,
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/** Zra P\ ?
* Created on 2005-7-12 )yl;i
*/ ln1QY"g
package com.javaeye.common.business; M?gc&2Y
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import java.io.Serializable; 3D}rxI8N
import java.util.List; w/1Os!p
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import org.hibernate.Criteria; kB!
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import org.hibernate.HibernateException; Md*~hb8J
import org.hibernate.Session; JK%UaEut=
import org.hibernate.criterion.DetachedCriteria; (drDC1\
import org.hibernate.criterion.Projections; EGL7z`nt
import MnPk+eNJm
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org.springframework.orm.hibernate3.HibernateCallback; JS!`eO/8
import -"CXBKHb
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org.springframework.orm.hibernate3.support.HibernateDaoS Tlar@lC|u
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upport; {<P{uH\l
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import com.javaeye.common.util.PaginationSupport; H
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public abstract class AbstractManager extends /5wIbmz@I
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HibernateDaoSupport { W<c95QD.
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privateboolean cacheQueries = false; F*4zC@;
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privateString queryCacheRegion; }2]m]D@%7
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publicvoid setCacheQueries(boolean ;CtTdr
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cacheQueries){ s?yl4\]Muf
this.cacheQueries = cacheQueries; mHB0eB'l
} ])9|j
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publicvoid setQueryCacheRegion(String ]r(&hqdR
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queryCacheRegion){ B.#.gB#C
this.queryCacheRegion = ]Vm:iF#5P
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queryCacheRegion; <HfmNhI85(
} 4>NmJrh
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publicvoid save(finalObject entity){ \LYNrL~?J
getHibernateTemplate().save(entity); (`js/7[`H[
} hRI?>an
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publicvoid persist(finalObject entity){ ^//`Dz
getHibernateTemplate().save(entity); ec&K}+p@
} (hi{i
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publicvoid update(finalObject entity){ WzqYBa
getHibernateTemplate().update(entity); oU/{<gs
} w{"ro~9o
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publicvoid delete(finalObject entity){ K}(@Ek
getHibernateTemplate().delete(entity); w!rw%
} {'UK>S
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publicObject load(finalClass entity, S7h?tR*u
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finalSerializable id){ % pQi}x
return getHibernateTemplate().load Zq"
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(entity, id); W}P9I&3
} DR(/|?k+
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publicObject get(finalClass entity, nU,~*Us
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finalSerializable id){ ?_j]w%Hz
return getHibernateTemplate().get ]T;
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(entity, id); ,DD}o
} ho%G
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publicList findAll(finalClass entity){ hH~GH'dnaE
return getHibernateTemplate().find("from 2v`Q;%7O
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" + entity.getName()); =3EE-%eF!
} ?#lHQT
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publicList findByNamedQuery(finalString 6B!v;93U
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namedQuery){ I#:Dk?"O2
return getHibernateTemplate S#b)RpY
sf Zb$T
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().findByNamedQuery(namedQuery); XaH;
} X@\ 9}*9
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publicList findByNamedQuery(finalString query, rCd*'Qg
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finalObject parameter){ T-y5U},
return getHibernateTemplate P*/ig0_fM
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().findByNamedQuery(query, parameter); ke19(r Ch
} @e2P3K gg
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publicList findByNamedQuery(finalString query, VK%
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finalObject[] parameters){ OU[ FiW-E
return getHibernateTemplate |&_(I
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().findByNamedQuery(query, parameters); P-\65]`C
} 3'!*/UnU
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publicList find(finalString query){ I.- I4F)D
return getHibernateTemplate().find S{nBQB<
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(query); 4k)0OQeW6
} %(B6eiA
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publicList find(finalString query, finalObject T U^s!Tj
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parameter){ ^!Tq(t5V
return getHibernateTemplate().find
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(query, parameter); M;sT+Z{
} J@qwz[d i
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public PaginationSupport findPageByCriteria (!% w
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(final DetachedCriteria detachedCriteria){ Uy<n7*H
return findPageByCriteria 0RHjA&r3v
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); z{nd4qOsD
} 7!JBF{,=
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public PaginationSupport findPageByCriteria oO9yI^
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(final DetachedCriteria detachedCriteria, finalint P,)\#([vc
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startIndex){ &%4A3.qE
return findPageByCriteria 2+|U!X
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(detachedCriteria, PaginationSupport.PAGESIZE, IZ@M
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startIndex); #kp+e)F
} o`.5NUn
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public PaginationSupport findPageByCriteria Bp/25jy
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(final DetachedCriteria detachedCriteria, finalint .[o`TlG%
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pageSize, $1n\jN
finalint startIndex){ $*C'{&2
return(PaginationSupport) 8aI^vP"7`=
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getHibernateTemplate().execute(new HibernateCallback(){ DI=?{A
publicObject doInHibernate .50ql[En
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(Session session)throws HibernateException { YXIAVSnr
Criteria criteria = Wb;D9Z
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detachedCriteria.getExecutableCriteria(session); f`-UC_(;
int totalCount = |3Bmsd/3
s} oD?h:T3
((Integer) criteria.setProjection(Projections.rowCount _f@nUv*
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()).uniqueResult()).intValue(); i!+0''i{#
criteria.setProjection <+:
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(null); YXDuhrs}
List items = Q1P=A:*]9
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criteria.setFirstResult(startIndex).setMaxResults ft?c&h;At
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(pageSize).list(); .Ix[&+LsY
PaginationSupport ps = iu QMVtv
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new PaginationSupport(items, totalCount, pageSize, vOU9[n
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startIndex); Q@/Z~xw"'I
return ps; 8>[o.xV
} >n jX=r.
}, true); bf6:J
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} ?L6pB]l8b
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public List findAllByCriteria(final RU% 4~WC
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DetachedCriteria detachedCriteria){ U<wM#l
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return(List) getHibernateTemplate >~})O&t
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().execute(new HibernateCallback(){ WT:ZT$W
publicObject doInHibernate #pk
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(Session session)throws HibernateException { r tH
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Criteria criteria = Y,{pG]B$w
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detachedCriteria.getExecutableCriteria(session); mJ+mTA5bW
return criteria.list(); =}2k+v-B
} {11xjvAD
}, true); mj&$+z M>
} f}7/UGd
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public int getCountByCriteria(final TnJNs
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DetachedCriteria detachedCriteria){ ;8yEhar
Integer count = (Integer) FMz>p1s|dK
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getHibernateTemplate().execute(new HibernateCallback(){ *@g>~q{`
publicObject doInHibernate Gq{ );fq
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(Session session)throws HibernateException {
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Criteria criteria = ~r&+18Z;
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detachedCriteria.getExecutableCriteria(session); o`{^ptu1q
return apWv+A
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criteria.setProjection(Projections.rowCount O#Ho08*Xn
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()).uniqueResult(); @# GS4I
} nRcy`A%
}, true); 5QZ}KNJ|t~
return count.intValue(); x2tcr+o
} d t^Hd]+^\
} !nTI(--
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用户在web层构造查询条件detachedCriteria,和可选的 OXF/4Oe
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Pp`[E/
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PaginationSupport的实例ps。 9EWw
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ps.getItems()得到已分页好的结果集 dlBr2 9
ps.getIndexes()得到分页索引的数组 K k|mV&3J
ps.getTotalCount()得到总结果数 A5RM&y
ps.getStartIndex()当前分页索引 o>A']+`Eu
ps.getNextIndex()下一页索引 t4+bRmS`_
ps.getPreviousIndex()上一页索引 {2LV0:k2
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 x]vyt}oCmk
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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> g8
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一下代码重构了。 tkW7wP;
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我把原本我的做法也提供出来供大家讨论吧: .Zr3!N.t
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首先,为了实现分页查询,我封装了一个Page类: 7$Lt5rn"}
java代码: #2;8/"v
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/*Created on 2005-4-14*/ JsDT
package org.flyware.util.page; UoHNKB73
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/** pd.5
* @author Joa g:Fo7*i
* 5EL&?\e
*/ Vw5Pgt x
publicclass Page { AA[?a
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/** imply if the page has previous page */ iJr(;Bq
privateboolean hasPrePage; oo]g=C$n
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/** imply if the page has next page */ LXm@h
privateboolean hasNextPage; + De-U.
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/** the number of every page */ :a_MT
privateint everyPage; nKe|xP
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/** the total page number */ M>u84|`
privateint totalPage; 1HUe8m[#3
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/** the number of current page */ L\\'n )
privateint currentPage; ja^
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/** the begin index of the records by the current
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query */ UDV6 ##$
privateint beginIndex; bDnT><eH
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/** The default constructor */ h&z(;B!;y.
public Page(){ ;Ngu(es6
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} >z k6{kC
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/** construct the page by everyPage
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* @param everyPage :xC1Ka%~
* */ T*](oA@
public Page(int everyPage){ 7mnZ,gpb
this.everyPage = everyPage; #ib?6=sPC
} cCq mrjUmV
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/** The whole constructor */ G<`6S5J>hr
public Page(boolean hasPrePage, boolean hasNextPage, 2bxW`.fa
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int everyPage, int totalPage, ;qaNIOo9
int currentPage, int beginIndex){ [y(<1]i-a
this.hasPrePage = hasPrePage; T)MZ`dM
this.hasNextPage = hasNextPage; ab>>W!r@!
this.everyPage = everyPage; LNF|mS\+D
this.totalPage = totalPage; {emym$we
this.currentPage = currentPage; x,#?
this.beginIndex = beginIndex; -S
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} z W*Z
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/** YeB)]$'?u`
* @return 8HL8)G6
* Returns the beginIndex. tfPe-U
*/ 4AYW'j C
publicint getBeginIndex(){ sNsWz.DLT#
return beginIndex; M~5Ja0N~
} &o7"L;
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/** t?h\Af4Tf
* @param beginIndex bjql<x5d
* The beginIndex to set. U^&y*gX1
*/ '(SqHP|8&g
publicvoid setBeginIndex(int beginIndex){ \{a 64
this.beginIndex = beginIndex; kD#hfYs)i
} 1!A'mkk8
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/** w %R=kY)o
* @return %( #kJZ
* Returns the currentPage. .]ZMxDZ
*/ /v7o!D1G
publicint getCurrentPage(){ no7Q%O9
return currentPage; [wM]w
} 1U8/.x|
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/** 2I0Zr;\f
* @param currentPage @c;:D`\p1C
* The currentPage to set. R&MetQ~-{
*/ 'h `)6{
publicvoid setCurrentPage(int currentPage){ H+ 7Fw'u
this.currentPage = currentPage; YeVkX{y
} >?r8D48`
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/** 73kI%nNB
* @return 5]Y?NN,GR
* Returns the everyPage. ;
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*/ R|-!5J4h
publicint getEveryPage(){ \
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return everyPage; JO&+W^$uY}
} @'JA3V}
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