Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ax]Pa*C}
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Y:GSjq
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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 #kO.'oIl
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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 uSeRn@
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分页支持类: njbEw4nX
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java代码: %^e~;i=2
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package com.javaeye.common.util; Q9-o$4#R[
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import java.util.List; NQ7j{dJ?
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publicclass PaginationSupport { {[r}&^K15
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publicfinalstaticint PAGESIZE = 30; E5-f{Qc
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privateint pageSize = PAGESIZE; 4 1w*<{Lk
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privateList items; +~gqPk
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privateint totalCount; l>l)m-;O
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privateint[] indexes = newint[0]; `t0?PpUo
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privateint startIndex = 0; -JL
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public PaginationSupport(List items, int Ix+===6
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totalCount){ 8vzjPWu
setPageSize(PAGESIZE); #41fRmzC
setTotalCount(totalCount); DU_38tz
setItems(items); KfC8~{O-
setStartIndex(0); x?hdC)#DWI
} aE[>^~Lv}
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public PaginationSupport(List items, int ZTCzD8
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totalCount, int startIndex){ O>zPWVwa
setPageSize(PAGESIZE); HOWm""IkB
setTotalCount(totalCount); ;aZ$qgN*Y
setItems(items); )Fc`rY
setStartIndex(startIndex); it=4cHT
} "iE9X.6NMu
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public PaginationSupport(List items, int ~*D)L'`2M
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totalCount, int pageSize, int startIndex){ 8Dpf{9Y-E
setPageSize(pageSize); +=%13cA*U
setTotalCount(totalCount); P%>? O :a
setItems(items); w[PWJ! <
setStartIndex(startIndex); "Iu[)O%
} CtVY;eG
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publicList getItems(){ |jm|/{lc
return items; +NPk9jn
} vOsd>3"
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publicvoid setItems(List items){ u3kK!2cdP
this.items = items; o#E 3{zM
} a8aEZ724
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publicint getPageSize(){ eA&hiAP/
return pageSize; _Jj/"?
} i^sK+v
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publicvoid setPageSize(int pageSize){ 6cSMKbgZJ
this.pageSize = pageSize; VB*N;bM^
} P7egT,Z
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publicint getTotalCount(){ L!S-f4^5
return totalCount; ,z1# |Y
} FAM`+QtNw
@KOa5-u
publicvoid setTotalCount(int totalCount){ *!Am6\+
if(totalCount > 0){ qu[w_1%S
this.totalCount = totalCount; ,;/4E
int count = totalCount / T:)>Tcv}:
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pageSize; '0t j2
if(totalCount % pageSize > 0) q{U -kuui
count++; 3BY/&'oX
indexes = newint[count]; `W]a
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for(int i = 0; i < count; i++){ I,YGm
indexes = pageSize * *D AgcB
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} M<ad>M
}else{ g!~j
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this.totalCount = 0; WZm^:,
} +B8Ut{l
} 2~ 'Q#(
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publicint[] getIndexes(){ 2Cr+Z(f
return indexes; >,] #~d
} nn=JM7e\9
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publicvoid setIndexes(int[] indexes){ Ix(4<s
this.indexes = indexes; spl*[ d
} Xrz0ch
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publicint getStartIndex(){ I?fE=2}9
return startIndex; qHKZ5w
} \]9;c6(
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publicvoid setStartIndex(int startIndex){ gIRCJ=e[b
if(totalCount <= 0) ?BLOc;I&a
this.startIndex = 0; 3R{-\ZMd
elseif(startIndex >= totalCount) &a|oJ'clz
this.startIndex = indexes ,88Y1|:X
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[indexes.length - 1]; `3+U6>U [
elseif(startIndex < 0) hV,3xrm?P
this.startIndex = 0; TgUQD(d^
else{ sW]n~kTt'
this.startIndex = indexes 9V"j=1B}
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[startIndex / pageSize]; G`
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} {c J6Lq&
} TtvS|09p;
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publicint getNextIndex(){ jqLyX
int nextIndex = getStartIndex() + (8*lLZ
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pageSize; l~=iUZW<
if(nextIndex >= totalCount) n;=A'g|Q
return getStartIndex(); -m@s
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else 3Yf$WE8#l
return nextIndex; y H'\<bT
} oF>GWstTR
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publicint getPreviousIndex(){ M ?3N
int previousIndex = getStartIndex() - j~{2fd<>
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pageSize; yjr@v!o
if(previousIndex < 0) Ax%BnkU
return0; N<{`n;
else 3(&.[o
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return previousIndex; H|Nw)*.
} jgstx3
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} nx4aGS"F:
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抽象业务类
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java代码: ;1dz?'%V
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/** 8F*
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* Created on 2005-7-12 }"-r;i
*/ g@2.A;N0
package com.javaeye.common.business; .}E)7"Qi,
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import java.io.Serializable; $imx-H`|
import java.util.List; Wy4^mOv
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import org.hibernate.Criteria; p[)<d_
import org.hibernate.HibernateException; CwvNxH#LVu
import org.hibernate.Session; MT`gr
import org.hibernate.criterion.DetachedCriteria; DS C4
import org.hibernate.criterion.Projections; #H`y1zm
import /;4MexgB%
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org.springframework.orm.hibernate3.HibernateCallback; P1wRt5
import f
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org.springframework.orm.hibernate3.support.HibernateDaoS ?nW#qy!R
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upport; YZl%JX
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import com.javaeye.common.util.PaginationSupport; CK(ev*@\D,
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public abstract class AbstractManager extends >n~p1: $
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HibernateDaoSupport { mj=|oIMwT
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privateboolean cacheQueries = false; kW&Z%k
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privateString queryCacheRegion; ~ fEs!hl
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publicvoid setCacheQueries(boolean SAh054/St
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cacheQueries){ AJfi,rFPg
this.cacheQueries = cacheQueries; )V3(nZY
} hxVM]e[
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publicvoid setQueryCacheRegion(String ACO4u<M)
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queryCacheRegion){ v8bl-9DQ
this.queryCacheRegion = !`[I>:Ex
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queryCacheRegion; G*i# \
} \t# 9zn>
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publicvoid save(finalObject entity){ yVHlT
getHibernateTemplate().save(entity); !u4Z0 !Ll
} m}[~A@qD
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publicvoid persist(finalObject entity){ v7FRTrqjj
getHibernateTemplate().save(entity); U?fN3
} )]>G,.9C}
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publicvoid update(finalObject entity){ uuYH6bw*d
getHibernateTemplate().update(entity); S"TMsi
} >xV<nLf/
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publicvoid delete(finalObject entity){ !Vr45l
getHibernateTemplate().delete(entity); R``VQ
} ix7
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publicObject load(finalClass entity, L\Fu']l
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finalSerializable id){ @=NVOJy}c
return getHibernateTemplate().load +GYMJK`S+
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(entity, id); Uk*;C
} )yNw2+ ~5
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publicObject get(finalClass entity, N _~KZQ11^
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finalSerializable id){ nK jeH@
return getHibernateTemplate().get `}9 1S
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(entity, id); ECS<l*i57&
} n`m_S
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publicList findAll(finalClass entity){ X4} `>
return getHibernateTemplate().find("from l0caP(
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" + entity.getName()); 762o~vY6$
} WE 5"A|
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publicList findByNamedQuery(finalString W7*_ T]
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namedQuery){ 9*=@/1
return getHibernateTemplate X40la_[.
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().findByNamedQuery(namedQuery); tB ,.
} mo|PrLV
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publicList findByNamedQuery(finalString query, 7O8V1Tt
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finalObject parameter){ 84p[N8
return getHibernateTemplate }RA3$%3
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().findByNamedQuery(query, parameter); KH2F#[
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} 6bbZ<E5At
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publicList findByNamedQuery(finalString query, 23}BW_m
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finalObject[] parameters){ *Z]5!$UpC
return getHibernateTemplate +}c|O+6g
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().findByNamedQuery(query, parameters); Y!Uu173
} jiA5oX^g
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publicList find(finalString query){ L.09\1?.n
return getHibernateTemplate().find f?=r3/AO
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(query); `a9k!3_L
} ;[{:'^n
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publicList find(finalString query, finalObject !
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parameter){ .sd B3x
return getHibernateTemplate().find jIAW-hc]
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(query, parameter); Tjnt(5 g
} g2g`,"T
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public PaginationSupport findPageByCriteria TK;\_yN
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(final DetachedCriteria detachedCriteria){ Dk)@>l:gI,
return findPageByCriteria BN+V,W
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); !(kX~S
} jZXVsd
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public PaginationSupport findPageByCriteria !2GHJHxv]c
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(final DetachedCriteria detachedCriteria, finalint Y.DwtfE
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startIndex){ [X;>*-
return findPageByCriteria >j&1?M2C
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(detachedCriteria, PaginationSupport.PAGESIZE, %lXbCE:[
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startIndex); y7CWBTH0>
} iPMB$SdfO
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public PaginationSupport findPageByCriteria N g58/}zO
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(final DetachedCriteria detachedCriteria, finalint Xa4GqV9M/-
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pageSize, SEYG y+#K
finalint startIndex){ T'hml
return(PaginationSupport) /Z:N8e
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getHibernateTemplate().execute(new HibernateCallback(){ [u[ U_g*
publicObject doInHibernate [1NaH
M
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(Session session)throws HibernateException { -<6v:Z
Criteria criteria = ,NDh@VYe
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detachedCriteria.getExecutableCriteria(session); F@9Y\. ,
int totalCount = +Z > <
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((Integer) criteria.setProjection(Projections.rowCount 3:UA<&=s
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()).uniqueResult()).intValue(); 5lO^;.cS,
criteria.setProjection T:U4:"
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(null); sv'
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List items = 8\DME
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criteria.setFirstResult(startIndex).setMaxResults 7ZQ'h3K
|ixGY^3;
(pageSize).list(); IdF$Ml#[h
PaginationSupport ps = E[UO5X
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new PaginationSupport(items, totalCount, pageSize, A';n6ne%i
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startIndex); dQai4e>[
return ps; 8^y= H=
} YxJ`-6
}, true); _-/x;C
} o_O+u%y
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public List findAllByCriteria(final rCE;'? Y
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DetachedCriteria detachedCriteria){ Ra0=q4vdk
return(List) getHibernateTemplate =5Wp&SM6
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().execute(new HibernateCallback(){ y^G>{?Tha
publicObject doInHibernate O~6Q;q P
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(Session session)throws HibernateException { E+z18Lf?
Criteria criteria = q`[K3p
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detachedCriteria.getExecutableCriteria(session); Mn@$;\:
return criteria.list(); HlPG3LD!
} <m0{'xw
}, true);
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} -;>#3O-
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public int getCountByCriteria(final b_=8!Q.:
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DetachedCriteria detachedCriteria){ 7]s%rya
Integer count = (Integer) [O_^MA,z
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getHibernateTemplate().execute(new HibernateCallback(){ /$:U$JVb?l
publicObject doInHibernate "yW&<7u1
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(Session session)throws HibernateException { 0[)VO[
Criteria criteria = i3PKqlp.
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detachedCriteria.getExecutableCriteria(session); 5m7b\Mak
return ax_YKJ5#P
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criteria.setProjection(Projections.rowCount [(|v`qMv/g
],[)uTZc
()).uniqueResult(); Obo _YE
} 94{)"w]
}, true); @]=f?+y[ 2
return count.intValue(); V7C1FV2
} %hINpZMr
} ~;unpym'
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用户在web层构造查询条件detachedCriteria,和可选的 :c7CiP
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 h/<=u9J
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PaginationSupport的实例ps。 =& -[TPW
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ps.getItems()得到已分页好的结果集 hCC}d0gf`n
ps.getIndexes()得到分页索引的数组 Rri`dmH
ps.getTotalCount()得到总结果数 ~Ltr.ci
ps.getStartIndex()当前分页索引 J :S'uxM
ps.getNextIndex()下一页索引 yC
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ps.getPreviousIndex()上一页索引 EGS%C%>l/o
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 {/}^D-
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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 s[AA7>]3
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一下代码重构了。 SDBt @=Nl
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我把原本我的做法也提供出来供大家讨论吧: 6RK\}@^=K
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首先,为了实现分页查询,我封装了一个Page类: SW9fE:v
java代码: u Z(? >
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/*Created on 2005-4-14*/ };S0 G!
package org.flyware.util.page; 'fY9a(Xt.
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/** Gvx[8I
* @author Joa C;qMw-*F
* &erm`Ho
*/ 8;n_TMb
publicclass Page { r:9gf?(&
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/** imply if the page has previous page */ tcL2J .
privateboolean hasPrePage; /fwgqFVk
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/** imply if the page has next page */ JP'=
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privateboolean hasNextPage; h6M;0_'
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/** the number of every page */ *%A}x
privateint everyPage; |4C^$
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/** the total page number */ 9UD
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privateint totalPage; 3 QCVgo
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/** the number of current page */ Kf.T\V4%
privateint currentPage; +m/,,+4
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/** the begin index of the records by the current _T*AC.
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query */ y0IK,W'&?
privateint beginIndex; -s"0/)HD
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/** The default constructor */ U^_D|$6
public Page(){ NFyMY#\]
nSS=%,?
} l(:kfR~AC
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/** construct the page by everyPage HL 8eD^
* @param everyPage "H+,E_&(
* */ tT5pggml
public Page(int everyPage){ [1(FgyE
this.everyPage = everyPage; oXgdLtsu
} wNDbHR
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/** The whole constructor */ ?R'Y?b
public Page(boolean hasPrePage, boolean hasNextPage, /QxlGfNZ
S`=WF^
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*
int everyPage, int totalPage, oF|N O^H
int currentPage, int beginIndex){ p>kq+mP2bc
this.hasPrePage = hasPrePage; 8r:M*25
this.hasNextPage = hasNextPage; I1=(. *B}
this.everyPage = everyPage; ;y1Q6eN
this.totalPage = totalPage; %SA!p;
this.currentPage = currentPage; ai-n z-;
this.beginIndex = beginIndex; pn%#w*'
} u, kU$
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/** I:=dG[\h2
* @return 1W,(\'^R
* Returns the beginIndex. rAukHeH
*/ 2qU&l|>
publicint getBeginIndex(){ i[nF.I5*f
return beginIndex; PkUd~c
} q,l)I+
j8$Zv%Ca%
/** f =s&n}
* @param beginIndex )K]pnH|
* The beginIndex to set. #h'@5 l
*/ JK)qZ=
publicvoid setBeginIndex(int beginIndex){ \8v91g91f
this.beginIndex = beginIndex; WeJ@xL
} ?6N3tk-2
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/** ^vni&sJ
* @return WxUxc75
* Returns the currentPage. fi%r<]@
*/ *yaw$oB
publicint getCurrentPage(){ raUs%Y3
return currentPage; iEHh{H(
} 1{PG>W
*75YGD
/** !iu5OX7K|
* @param currentPage &t}?2>:
* The currentPage to set. {=Q7m`1
*/ >lzA]aM$c
publicvoid setCurrentPage(int currentPage){ veh
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this.currentPage = currentPage; m#5_%3T
} 0Y+FRB]u
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hH
/** Te-Amu
* @return ?ny=
* Returns the everyPage. dQ:cYNm
*/ =JO^XwUOo
publicint getEveryPage(){ @F5f"8!.\
return everyPage; X_ TiqV
} smy}3k
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/** \=e8%.#@J
* @param everyPage +}kgQ^
* The everyPage to set. -j2 (R?a
*/ &1^%Nxu1
publicvoid setEveryPage(int everyPage){ Tx>K:`oB
this.everyPage = everyPage; pmc=NTr&<
} ][@F
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/** 6[P-Ny{z
* @return l]LxL
* Returns the hasNextPage. U.oksD9v
*/ -*ELLY[
publicboolean getHasNextPage(){ "MOpsb,
return hasNextPage; J%rP$O$
} Zj9c9
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/** PGn);Baq
* @param hasNextPage ]!"S+gT*C
* The hasNextPage to set. GF<[ }
*/ d j5hv~
publicvoid setHasNextPage(boolean hasNextPage){ %:9oDK
this.hasNextPage = hasNextPage; al^!,ykc
} X ]j)+DX>
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/** ;iQEkn2T|}
* @return z%d#@w0X1
* Returns the hasPrePage. j]4,<ppWSH
*/ OYL]j{
publicboolean getHasPrePage(){ n(ir[w#,]"
return hasPrePage; ).412I
} 4mYCSu14:`
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/**
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* @param hasPrePage }^ FulsC
* The hasPrePage to set. Gpj* V|J
*/ [:;# ]?
publicvoid setHasPrePage(boolean hasPrePage){ K`%tGVY
this.hasPrePage = hasPrePage; uXZg1F)
} zd%rs~*c
- xm{&0e)
/** $9!D\N,}]C
* @return Returns the totalPage. XFwLz
*
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*/ f>9s!Hpu_
publicint getTotalPage(){ sp9W?IJ 6c
return totalPage; ?,knit2x
} Zl/<