Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 r
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 FL?Ndy"I
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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 [Zj6v a
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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 ,/Usyb,`
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分页支持类: {T'M4y=)i
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java代码: ibL
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package com.javaeye.common.util; gBd@4{y6C.
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import java.util.List; i/{`rv*K[
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publicclass PaginationSupport { F7lzc)
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publicfinalstaticint PAGESIZE = 30; rPXy(d1<`S
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privateint pageSize = PAGESIZE; <&MY/vV
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privateList items; rJw
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privateint totalCount; klxNGxWAX
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privateint[] indexes = newint[0]; 4ZCD@C
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privateint startIndex = 0; 'H8;(Rw
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public PaginationSupport(List items, int +Vw]DLWR
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totalCount){
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setPageSize(PAGESIZE); MNu\=p\Eq
setTotalCount(totalCount); N"-U)d-.
setItems(items); eiJ~1HX)
setStartIndex(0); R>y/Y<5=
} ihBIE
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public PaginationSupport(List items, int 5h@5.-}
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totalCount, int startIndex){ |DkK7gw
setPageSize(PAGESIZE); 2f0qfF
setTotalCount(totalCount); -n~%v0D8c
setItems(items); u5rHQA0%
setStartIndex(startIndex); K %.>o
} a_U[!`/w
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public PaginationSupport(List items, int M+GtUE~"
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totalCount, int pageSize, int startIndex){ 3e ?J#;
setPageSize(pageSize); 6~tj"34_
setTotalCount(totalCount); 4gh`
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setItems(items); $*c!9Etl4
setStartIndex(startIndex); @r3,|tkrz
} s}g3*_"
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publicList getItems(){ a+,zXJQYq
return items; DsCbMs=Y
} {4YD_$4W
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publicvoid setItems(List items){ 8T}Dn\f
this.items = items; -muP.h/
} SdNxSD$Q
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publicint getPageSize(){ $ 9
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return pageSize; d:JP935
} ~*hCTqHvN
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publicvoid setPageSize(int pageSize){ 9T%b#~?3P
this.pageSize = pageSize; EnP>
} >9,:i)m_
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publicint getTotalCount(){ }.r)
return totalCount; i0'g$
} #Q$e%VJ(c1
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publicvoid setTotalCount(int totalCount){ C=x70Y/
if(totalCount > 0){ +c' n,O~3
this.totalCount = totalCount; tu6<>
int count = totalCount / C@!bd+'
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pageSize; hQwUwfoe@
if(totalCount % pageSize > 0) JQ9+kZ
count++; 'RZ0,SK'
indexes = newint[count]; UL]zuW/
for(int i = 0; i < count; i++){ *r|Zbxf(
indexes = pageSize * cv-;fd>'
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} wQ?Z y;/S
}else{ 2hY"bpGW
this.totalCount = 0; V(;c#%I2
} dpcU`$kt
} 't+'rG6x
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publicint[] getIndexes(){ ?KG4Z
return indexes; &n]]OPo
} 11RqP:zg
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publicvoid setIndexes(int[] indexes){ ??z&w`Yy,
this.indexes = indexes; YM#J_sy@J.
} R0e!b+MZ.
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publicint getStartIndex(){ ='6@^6y
return startIndex; m@"p#pt(_
} y\R-=Am".
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publicvoid setStartIndex(int startIndex){ .F3~eas
if(totalCount <= 0) |8fdhqy_
this.startIndex = 0; qdo_YPG
elseif(startIndex >= totalCount) \`W8#fob
this.startIndex = indexes .&.L@CRH
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[indexes.length - 1]; ]F #0to
elseif(startIndex < 0) h<i.Z7F;tj
this.startIndex = 0; j-v/;7s/B
else{ {BZ0x2
this.startIndex = indexes 8#IEE|1
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[startIndex / pageSize]; o(D6
} B-V
} Mo\nY5
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publicint getNextIndex(){ R)Dh; XA
int nextIndex = getStartIndex() + 0>:`|IGnT2
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pageSize; ~R7{gCqdr
if(nextIndex >= totalCount) }]. |7h
return getStartIndex(); JC9OL.Ob
else .jl^"{@6
return nextIndex; A+VzpJ~
} Tj=@5lj0
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publicint getPreviousIndex(){ Vu,:rPqI
int previousIndex = getStartIndex() - Ox6^=D"
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pageSize; (qDJgf4fgn
if(previousIndex < 0) h8P_/.+g|V
return0; GuQ#
else Y^gIvX
return previousIndex; QY$4D;M`g6
} fa,;Sw
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} MJ.Kor
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抽象业务类 vr$z6m ^
java代码: \p\rPfY{>
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/** b2YOnV
* Created on 2005-7-12 `(8RK
*/ 6H:EBj54?
package com.javaeye.common.business; sJ|IW0Mr
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import java.io.Serializable; A{Q~@1
import java.util.List; Xa[lX8$zL
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import org.hibernate.Criteria; s=n_(}{ q
import org.hibernate.HibernateException; 2^&5D,}0
import org.hibernate.Session; ; T WYO
import org.hibernate.criterion.DetachedCriteria; RueL~$*6.~
import org.hibernate.criterion.Projections; ;sd] IZ$#
import e{d$OzT) V
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org.springframework.orm.hibernate3.HibernateCallback; 66cPoG
import I)4NCjcCw
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org.springframework.orm.hibernate3.support.HibernateDaoS 5va ;Ol4
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upport; eXMl3Lxf
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import com.javaeye.common.util.PaginationSupport; kk3G~o+
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public abstract class AbstractManager extends }C&kzJBEF
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HibernateDaoSupport { N9cUlrDO
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privateboolean cacheQueries = false; xsXf_gGu
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privateString queryCacheRegion; _1P8rc"Dx
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publicvoid setCacheQueries(boolean +4k7ti1Qb
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cacheQueries){ !,>9?(
this.cacheQueries = cacheQueries; u<
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} h`/1JjP
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publicvoid setQueryCacheRegion(String x)o`w"]al
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queryCacheRegion){ )NS&1$
this.queryCacheRegion =
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queryCacheRegion; \~'+TW
} { Sn
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publicvoid save(finalObject entity){ /|{~GD +A&
getHibernateTemplate().save(entity); 2u'h,on?
} h^"OC$
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publicvoid persist(finalObject entity){ {F+iL&e)
getHibernateTemplate().save(entity); fQOh%i9n5
} 8?&u5
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publicvoid update(finalObject entity){ 0|_d{/VK4
getHibernateTemplate().update(entity); Q@/358.LA
} H:M;H=0
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publicvoid delete(finalObject entity){ Oy
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getHibernateTemplate().delete(entity); KCP$i@Pjv
} -w'
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publicObject load(finalClass entity, ,2oF t\`.r
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finalSerializable id){ vz6No%8X
return getHibernateTemplate().load y_mTO4\C2
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(entity, id); bUvVt3cm
} 2_T2?weD5
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publicObject get(finalClass entity, MrjgV+P}[
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finalSerializable id){ `]~1pc
return getHibernateTemplate().get GmhfBW?
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(entity, id); u00w'=pe)
} #qLsAw--Q
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publicList findAll(finalClass entity){ TOT#l6yqdd
return getHibernateTemplate().find("from Ec/&?|$
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" + entity.getName()); OQ(w]G0LP
} [~NJf3c"
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publicList findByNamedQuery(finalString *kYJwO^
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namedQuery){ '\B0#z3
return getHibernateTemplate Mmmg3%G1
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().findByNamedQuery(namedQuery); pO?v$Rjl
} 8Z|A'M
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publicList findByNamedQuery(finalString query, p40;@gUug
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finalObject parameter){
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return getHibernateTemplate 'XJqh|G
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().findByNamedQuery(query, parameter); C'~Eq3
} ~6A;H$dr
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publicList findByNamedQuery(finalString query, a B$x(8pP@
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finalObject[] parameters){ 2c*w{\X
return getHibernateTemplate >,x&L[3
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().findByNamedQuery(query, parameters); IM$ d~C
} 6t\0Ui
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publicList find(finalString query){ w=_q<1a
return getHibernateTemplate().find hG~HV{6
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(query); B/*\Ih9y
} *(s0X[-
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publicList find(finalString query, finalObject =pZ$oTR
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parameter){ Nwj M=GG
return getHibernateTemplate().find `>4"i+NFF8
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(query, parameter); XRmE
} "8p<NsU
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public PaginationSupport findPageByCriteria }hE!0q~MfM
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(final DetachedCriteria detachedCriteria){ -mP2}BNM
return findPageByCriteria TNDp{!<|L;
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); l)e6*sDZ,
} ev#/v:$?
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public PaginationSupport findPageByCriteria ^RE[5h6^q
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(final DetachedCriteria detachedCriteria, finalint K5RgWP
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startIndex){ bk0<i*ju7(
return findPageByCriteria /2''EF';
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(detachedCriteria, PaginationSupport.PAGESIZE, 0 .UN
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startIndex); TS`m&N{i")
} !3<b#QAXRG
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public PaginationSupport findPageByCriteria 'pyIMB?x
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(final DetachedCriteria detachedCriteria, finalint G)?j(El
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pageSize, qC=9m[MI
finalint startIndex){ 1h|qxYO
return(PaginationSupport) H2xDC_Fs
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getHibernateTemplate().execute(new HibernateCallback(){ mE;^B%v
publicObject doInHibernate (/^?$~m"
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(Session session)throws HibernateException { o^/ fr&,9
Criteria criteria =
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detachedCriteria.getExecutableCriteria(session); I]HLWF
int totalCount = tJ*/5k
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((Integer) criteria.setProjection(Projections.rowCount m^zD']
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()).uniqueResult()).intValue(); QkWEVL@uM
criteria.setProjection t\]kVo)
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(null); }8ESp3~e_
List items = 2"k|IHs1
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criteria.setFirstResult(startIndex).setMaxResults dNCd-ep
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(pageSize).list(); p.<d+S<
PaginationSupport ps = S|;}]6p
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new PaginationSupport(items, totalCount, pageSize, NGRXNh+
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startIndex); fOKAy'
return ps; \rT>&o .i
} vR pO0qG
}, true); kyZZ0
} U6o]7j&6
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public List findAllByCriteria(final JaR!9GVN7
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DetachedCriteria detachedCriteria){ .g7\+aiTUd
return(List) getHibernateTemplate t8; nP[`
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().execute(new HibernateCallback(){ ^jcVJpyT@R
publicObject doInHibernate t?b@l<,s
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(Session session)throws HibernateException { XF>!~D
Criteria criteria = h#dfhcU>
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detachedCriteria.getExecutableCriteria(session); O2f-{jnTz,
return criteria.list(); * *oDQwW]*
} ({$rb-
}, true); }IdkXAB.
} pV!WZUfg
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public int getCountByCriteria(final 1. <g C
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DetachedCriteria detachedCriteria){ A;6ew4
Integer count = (Integer) $"}[\>e*{
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getHibernateTemplate().execute(new HibernateCallback(){ Q ~n%c7
publicObject doInHibernate P)hGe3
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(Session session)throws HibernateException { *y` (^kyS
Criteria criteria = DeeV;?:
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detachedCriteria.getExecutableCriteria(session); D'^%Q_;u
return c+O:n:L
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criteria.setProjection(Projections.rowCount fQ-IM/z
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()).uniqueResult(); q;7DH4;t
} pbw{EzM
}, true); :T<5Tq*+x
return count.intValue(); HV*;Yt
} G.PRPl
} NOKU2d4 G
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用户在web层构造查询条件detachedCriteria,和可选的 T''<y S
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 C7DwA/$D
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PaginationSupport的实例ps。 d`~~Ww1
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ps.getItems()得到已分页好的结果集 nd7g8P9p
ps.getIndexes()得到分页索引的数组 `*D"=5G+
ps.getTotalCount()得到总结果数 l@ (:Q!Sk
ps.getStartIndex()当前分页索引 1aCpeD4|)
ps.getNextIndex()下一页索引 q alrG2
ps.getPreviousIndex()上一页索引 1 vtC4`
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ;mvVo-r*q
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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 c*(^:#"9
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一下代码重构了。 N"suR}9%
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我把原本我的做法也提供出来供大家讨论吧: R<(xWH
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首先,为了实现分页查询,我封装了一个Page类: )nFyHAy-
java代码: z^z`{B
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/*Created on 2005-4-14*/ P;mp)1C
package org.flyware.util.page; Ip:54
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/** ,wXmJ)/WZ
* @author Joa 7nFOVZ
* }a.j~>rq
*/ ! ?/:p.
publicclass Page { ,isjiy
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/** imply if the page has previous page */ m}\QGtJ6
privateboolean hasPrePage; H-U_
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/** imply if the page has next page */ RAP-vVh/C
privateboolean hasNextPage; S2_(lS+R
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/** the number of every page */ Y[dq"
privateint everyPage; $LFL4Q
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/** the total page number */ " aCAA#$J
privateint totalPage; x3Y)l1gh
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/** the number of current page */ \7"|'fz
privateint currentPage; CgrQ"N5
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/** the begin index of the records by the current kFV, Fg
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query */ y!.jpF'uI
privateint beginIndex;
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/** The default constructor */ -p.\fvip
public Page(){ UNff&E-
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} $[n:IDa*@1
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/** construct the page by everyPage ?'9IgT[*
* @param everyPage uMS+,dXy
* */ \/o$io,kV
public Page(int everyPage){ @2)nhW/z6
this.everyPage = everyPage; ACdPF_Y]
} E<[
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/** The whole constructor */ kzDN(_<1
public Page(boolean hasPrePage, boolean hasNextPage, g}xL7bTlI>
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int everyPage, int totalPage, oDz|%N2s|
int currentPage, int beginIndex){ P*OG`%y
this.hasPrePage = hasPrePage; 7MLLx#U
this.hasNextPage = hasNextPage; [eDrjf3m
this.everyPage = everyPage; 49$<:{ ~
this.totalPage = totalPage; !S#3mT-
this.currentPage = currentPage; 0lg$zi x(
this.beginIndex = beginIndex;
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} V0>X2&.A
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/** =GPXuo
* @return 7"!b5(4=
* Returns the beginIndex. v$|~
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*/ ` 3qf}=Z`
publicint getBeginIndex(){ m-vn5OX
return beginIndex; yx :^*/
} 8(L$a1#5W
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/** >u&D@7~c
* @param beginIndex W2
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* The beginIndex to set. oS fr5
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*/ =9GALoGL
publicvoid setBeginIndex(int beginIndex){ sFTAE1|
this.beginIndex = beginIndex; WiS3W;
} $3^M-w
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/** XB7Aa)
* @return nF <K84
* Returns the currentPage. &zdS9e-fF
*/ 1;ttwF>G7
publicint getCurrentPage(){ |Vx[
return currentPage; :>0ywg
} eU1F7LS
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/** gyw=1q+
* @param currentPage _O`p (6
* The currentPage to set. A@}5'LzL
*/ bY" zK',m
publicvoid setCurrentPage(int currentPage){ i%K6<1R;y{
this.currentPage = currentPage; !9;m~T7.
} ,|A^ <R`
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/** |g&V? lI
* @return <=M5)#
* Returns the everyPage. 41X`.
*/ ?+t;\
publicint getEveryPage(){ gk%nF
return everyPage; v`A)GnNiN
} 4$xVm,n|
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/** a{kJ`fK
* @param everyPage u cpU$+
* The everyPage to set. ?^Rp"
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*/ 46>rvy.r
publicvoid setEveryPage(int everyPage){ f .O^R~,
this.everyPage = everyPage; FK^xZ?G
} 4z<c8
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/** ZmsYRk~@-
* @return b Hr^_ogN
* Returns the hasNextPage. A6z,6v6
*/ &-=~8
publicboolean getHasNextPage(){ 7{m>W!
return hasNextPage;
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} vi##E0,N'^
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/** }yT/UlU
* @param hasNextPage 50_[hC&C)
* The hasNextPage to set. 6Z_V,LD9L
*/ L$PbC!1
publicvoid setHasNextPage(boolean hasNextPage){ 05wkUo:9
this.hasNextPage = hasNextPage; &>jz[3
} syX?O'xJ
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/** UR'[?
* @return )g@+
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* Returns the hasPrePage. BN 9e S
*/ #*iUZo
publicboolean getHasPrePage(){ =Y2 Rht
return hasPrePage; }097[-g7
} IWv(GQx
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/** $Tbsre\MJ
* @param hasPrePage ._rPM>B?
* The hasPrePage to set. BE0l2[i?
*/ 0F)v9EK(W4
publicvoid setHasPrePage(boolean hasPrePage){ .YF1H<gwa
this.hasPrePage = hasPrePage; };'@'
} .n7@$kq
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/** _HwA%=>7
* @return Returns the totalPage. Tt: (l/1
* i9ySD
*/ Vlx.C~WYn
publicint getTotalPage(){ $@Vn+|
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return totalPage; 'Ix@<$~i3F
} =`+D/
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/** /b=C
* @param totalPage MFq?mZ,
* The totalPage to set. _$UJ'W})/
*/ t'2A)S
publicvoid setTotalPage(int totalPage){ T<*)Cdid
this.totalPage = totalPage; `NtW+v
} Z
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} zQ+Mu^|u+
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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 uGZGI;9f4
6/<Hx@r (
个PageUtil,负责对Page对象进行构造: [!)HWgx
java代码: 1o&z