Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 $uLTYu
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 *,u{,$}2
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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 6+=_p$crMx
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 vhZXgp0X
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分页支持类: ybpOk
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java代码: _J*l,]}S
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package com.javaeye.common.util; 5$i(f8*
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import java.util.List; I(UK9H{0$
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publicclass PaginationSupport { OcB&6!1u
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publicfinalstaticint PAGESIZE = 30; qFVZhBC
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privateint pageSize = PAGESIZE; Z71_D
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privateList items; IlF_g`
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privateint totalCount; "tT4Cb3
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privateint[] indexes = newint[0]; R(t%/Hvs$
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privateint startIndex = 0; \HxF?i "
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public PaginationSupport(List items, int zMepF]V
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totalCount){ <j,I@%
setPageSize(PAGESIZE); HFB>0<$
setTotalCount(totalCount); e'~Qe_
setItems(items); Uhu?G0>O
setStartIndex(0); 8K^#$,.."
} xlcCL?qQj
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public PaginationSupport(List items, int ;0Uat
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totalCount, int startIndex){ Ri"rT] '
setPageSize(PAGESIZE); ^WU[+H ;
setTotalCount(totalCount); R;,5LS&*a
setItems(items); shGUG;
setStartIndex(startIndex); ?taC
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} uv5NqL&
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public PaginationSupport(List items, int RJ'za1@z;b
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totalCount, int pageSize, int startIndex){ c}v8j2{
setPageSize(pageSize); Sj)?!
setTotalCount(totalCount); _G`Q2hf"5
setItems(items); =Crl{Ax
setStartIndex(startIndex); *56j'FX
} J_a2DM6d
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publicList getItems(){ *s, bz.[
return items; nVlZ_72d
} 4]}d'x&
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publicvoid setItems(List items){ 3Ch42<
this.items = items; rhYAR r'
} ` *hTx|!'
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publicint getPageSize(){ Vh01y f
return pageSize; W rT_7
} alxIc.[
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publicvoid setPageSize(int pageSize){ f:nXE&X[
this.pageSize = pageSize; UQ hD8Z'I.
} b4$g$()
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publicint getTotalCount(){ aeYz;&K
return totalCount; 2./z6jXW_
} EWl9rF@I
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publicvoid setTotalCount(int totalCount){ O*2{V]Y
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if(totalCount > 0){ +-x+c:
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this.totalCount = totalCount; /_JR7BB^X,
int count = totalCount / jn]l!nm
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pageSize; U e-AF#
if(totalCount % pageSize > 0) FYNUap,A
count++; 1C=42ZZ&2
indexes = newint[count]; ^^V+0 l
for(int i = 0; i < count; i++){ "tb KbFn9
indexes = pageSize * P;7[5HFF
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} aA%x9\Y
}else{ ?y%Mm09
this.totalCount = 0; 8u*Q^-fpo0
} J>hjIN
} e2xKo1?I
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publicint[] getIndexes(){ SXXO#
return indexes; 'D[ *|Qcy
} XThU+s9
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publicvoid setIndexes(int[] indexes){ *Qngx
this.indexes = indexes; eZL!Z!
} Ug[0l)
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publicint getStartIndex(){ 1JS5 LS
return startIndex; 6DEH|2
} cri-u E?
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publicvoid setStartIndex(int startIndex){ YYe<StyH
if(totalCount <= 0) AgDXpaq
this.startIndex = 0; 7 }t=Lx(
elseif(startIndex >= totalCount) wlwgYAD
this.startIndex = indexes \*fXPJ4
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[indexes.length - 1]; %Zeb#//Jz
elseif(startIndex < 0) <0/)v
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this.startIndex = 0; V+u0J"/8
else{
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this.startIndex = indexes g|]Hm*
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[startIndex / pageSize]; ASS<XNP
} 80U(q/H%9
} Pr/q?qZY
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publicint getNextIndex(){ t,~feW,
int nextIndex = getStartIndex() + Ch=jt*0
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pageSize; 47&p*=
if(nextIndex >= totalCount) | m#"
return getStartIndex(); uE#"wm'J
else 0LWV.OIIC
return nextIndex; P$__c{1\
} \O>;,(>i
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publicint getPreviousIndex(){ I0bkc3
int previousIndex = getStartIndex() -
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pageSize; o3'Za'N.
if(previousIndex < 0) }dq)d.c
return0; Q2gz\N
else
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return previousIndex; BI>r'
} L>`inrpz=w
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} :dlG:=.W
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抽象业务类 g s%[Cv
java代码: %pxHGO=)E
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/** s8*Q@0
* Created on 2005-7-12 aO
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*/ #%/0a
package com.javaeye.common.business; 'V4B{n7h
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import java.io.Serializable; @i>4k
import java.util.List; K pKZiUQm
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import org.hibernate.Criteria; ]%(X}]}
import org.hibernate.HibernateException; _10I0Z0
import org.hibernate.Session; {UuSNZ[^
import org.hibernate.criterion.DetachedCriteria; w!l*!G
import org.hibernate.criterion.Projections; .V{y9e+
import 1VPxCB\
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org.springframework.orm.hibernate3.HibernateCallback; X$<CIZ
import 0fw>/"v
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org.springframework.orm.hibernate3.support.HibernateDaoS E7U.>8C
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upport; [58qC:
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import com.javaeye.common.util.PaginationSupport; KhNE_.
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public abstract class AbstractManager extends iB*1Yy0DC
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HibernateDaoSupport { i7O8f^|
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privateboolean cacheQueries = false; nhB.>ReAi
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privateString queryCacheRegion; N}\3UHtO
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publicvoid setCacheQueries(boolean ?fvK<0S`
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cacheQueries){ o[k,{`M0
this.cacheQueries = cacheQueries; HA;G{[X
} KCS},X_
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publicvoid setQueryCacheRegion(String u:}yE^8 @
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queryCacheRegion){ O<+x=>_
this.queryCacheRegion = Y-P?t+l
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queryCacheRegion; (+.R8
} MgQb" qx
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publicvoid save(finalObject entity){ *qw//W
getHibernateTemplate().save(entity); bP1]:^ x@W
} 3Ebkq[/*%
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publicvoid persist(finalObject entity){ >^adxXw.o
getHibernateTemplate().save(entity); 9y*pn|A[F
} cG4$)q;q
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publicvoid update(finalObject entity){ 2]_fNCNLN
getHibernateTemplate().update(entity); <w0$0ku
} =\x(Rs3
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publicvoid delete(finalObject entity){ ()EiBl(kWk
getHibernateTemplate().delete(entity); HhT6gJWrU
} a>)|SfsE
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publicObject load(finalClass entity, X[$FjKZh=F
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finalSerializable id){ 6cTd
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return getHibernateTemplate().load {GQRJ8m
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(entity, id); t|cTl/i
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} _iZ9Ch\
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publicObject get(finalClass entity, ~d&W;mef-
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finalSerializable id){ cp3O$S
return getHibernateTemplate().get Aw7_diK^
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(entity, id); 52z{
} /\UFJ
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publicList findAll(finalClass entity){ 7Ezy-x2h
return getHibernateTemplate().find("from dW"=/UW
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" + entity.getName()); =LojRY
} ]"-c?%L
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publicList findByNamedQuery(finalString f]]UNS$AYQ
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namedQuery){ OVU+V 0w1a
return getHibernateTemplate rI;tMNs
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().findByNamedQuery(namedQuery); "tg?V
} pcO0xrI
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publicList findByNamedQuery(finalString query, ~Jx0#+z9V
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finalObject parameter){ Eh|v>Yew
return getHibernateTemplate #@K
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().findByNamedQuery(query, parameter); 0m&W: c
} {K >}eO:K
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publicList findByNamedQuery(finalString query, NmZowh$M
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finalObject[] parameters){ Q*8=^[x
return getHibernateTemplate +|TFxaVz
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().findByNamedQuery(query, parameters); >):^Zs
} ^*_|26
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publicList find(finalString query){ pn-`QB:{h
return getHibernateTemplate().find 8;1,saA_9
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(query); b[`fQv$G
} 2mfKy9QxO
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publicList find(finalString query, finalObject %<[U\TL`
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parameter){ Mib<1ZM
return getHibernateTemplate().find KkD&|&!Q7u
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(query, parameter); K%RjWX=H
} NX9K%J
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public PaginationSupport findPageByCriteria xJ|_R,>.H
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(final DetachedCriteria detachedCriteria){ We?cRb
return findPageByCriteria g]E>e v{`
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); u#~q86k
} K *xca(6
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public PaginationSupport findPageByCriteria \9`76*X6
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(final DetachedCriteria detachedCriteria, finalint 0m
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startIndex){ 8a,pDE
return findPageByCriteria L@>$
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(detachedCriteria, PaginationSupport.PAGESIZE, [ T!0ka
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startIndex); $hq'9}ASOL
} SVJt= M
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public PaginationSupport findPageByCriteria $Z[W}7{pt#
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(final DetachedCriteria detachedCriteria, finalint c-q=Ct
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pageSize, gvu1
finalint startIndex){ l[u=_uaYl
return(PaginationSupport) _fE$KaP
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getHibernateTemplate().execute(new HibernateCallback(){ q3}WO]TBj
publicObject doInHibernate W 2T6JFv
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(Session session)throws HibernateException { x#c%+
Criteria criteria = y`8bx94jB
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detachedCriteria.getExecutableCriteria(session); nC(<eL
int totalCount = =]m,7 v Rq
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((Integer) criteria.setProjection(Projections.rowCount M"
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()).uniqueResult()).intValue(); jU0E=;1
criteria.setProjection fF]w[lLDv
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(null); w:c9Z=KX
List items = Z,1b$:+
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criteria.setFirstResult(startIndex).setMaxResults pi;'! d[l%
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(pageSize).list(); Wf:LYL
PaginationSupport ps = pX?/=T@ Bw
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new PaginationSupport(items, totalCount, pageSize, KGJ *h
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startIndex); )];Bo.QA
return ps; "X,*VQl:
} k keDt+^
}, true); p-XO4Pc6
} L25%KGg'o
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public List findAllByCriteria(final ToX--w4
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DetachedCriteria detachedCriteria){ Znd ,FqHk
return(List) getHibernateTemplate Z]08gH
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().execute(new HibernateCallback(){ nZ %%{#T7
publicObject doInHibernate zEk/15
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(Session session)throws HibernateException { zvK'j"Wq=
Criteria criteria = X.+|o@G
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detachedCriteria.getExecutableCriteria(session); b} FhC"'i
return criteria.list(); )fQ1U
} mI'&!@WG
}, true); 6{!Cx9V
} o[)*Y`xq<w
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public int getCountByCriteria(final Vw]!Kb7tA
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DetachedCriteria detachedCriteria){ >R}G
Integer count = (Integer) pp@O6
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getHibernateTemplate().execute(new HibernateCallback(){ xVk5%
publicObject doInHibernate }0,dG4Oo=
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(Session session)throws HibernateException { "!ks7:}v
Criteria criteria = ]=ADX}
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detachedCriteria.getExecutableCriteria(session); -&l%CR,U
return //'&a-%$^
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criteria.setProjection(Projections.rowCount /@B2-.w
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()).uniqueResult(); $0k7W?tu
} G=]ox*BY
}, true); V*DD U]0k
return count.intValue(); ?dPr HSy
} .N7<bt@~)
} [&g"Z"
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用户在web层构造查询条件detachedCriteria,和可选的 (D:-p:q.
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 udXzsY9Ng
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PaginationSupport的实例ps。 vVP.9(
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ps.getItems()得到已分页好的结果集 l(W?]{C[%
ps.getIndexes()得到分页索引的数组 /b\c<'3NY
ps.getTotalCount()得到总结果数 `~z[Hj=2
ps.getStartIndex()当前分页索引 3"juj'
ps.getNextIndex()下一页索引 NeJ->x,
ps.getPreviousIndex()上一页索引 W,"Re,`H
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 TB-dV'w
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 ,Js-'vX
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一下代码重构了。 ,,!P-kK$
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我把原本我的做法也提供出来供大家讨论吧: zk"8mTg
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首先,为了实现分页查询,我封装了一个Page类: c/igw+L()
java代码: 7377g'jL
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/*Created on 2005-4-14*/ 684d&\(s
package org.flyware.util.page; >JAWcT)d
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/** yM7Iq)o6u
* @author Joa /!MVpi'6&
* ``eam8Az_U
*/ T:@7EL
publicclass Page { {o 2 qY|S
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/** imply if the page has previous page */ fERO(o
privateboolean hasPrePage; MB7*AA;
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/** imply if the page has next page */ R}cNhZC
privateboolean hasNextPage; ec`re+1r
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/** the number of every page */ p_(En4QSH
privateint everyPage;
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/** the total page number */ YSB=nd_
privateint totalPage; d^J)Mhju
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/** the number of current page */ zj(V\y&H
privateint currentPage; #]6{>n1*+w
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/** the begin index of the records by the current KGcjZx04!
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query */ pB#I_?(
privateint beginIndex; +wJ!zab`
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/** The default constructor */ ZOMYo]
public Page(){ &^#u=w?^x
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} CGzu(@dd\
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/** construct the page by everyPage SJ<v< B
* @param everyPage atF#0*e>
* */ fBctG~CJH
public Page(int everyPage){ b,YNCb]H
this.everyPage = everyPage; g&y^ r/
} %T\hL\L?
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/** The whole constructor */ huS*1xl
public Page(boolean hasPrePage, boolean hasNextPage, \ ZE[7Ae
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int everyPage, int totalPage, /.<v,CR
int currentPage, int beginIndex){ Y*PfU+y~
this.hasPrePage = hasPrePage; g_`a_0v
this.hasNextPage = hasNextPage; 9$Z0mz k
this.everyPage = everyPage; /1v9U|j
this.totalPage = totalPage; KMz!4N
this.currentPage = currentPage; )S(Ly.
this.beginIndex = beginIndex; XC)9aC@s
} e1LIk1`p
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/** P3: t
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* @return Hj|&P/jY]*
* Returns the beginIndex. 4&;iORw&E4
*/ BhzD V
publicint getBeginIndex(){ <y] 67:"<v
return beginIndex; QcW8A ,\q
} 3_Xu3hNH!
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/** F{!pii5O9
* @param beginIndex No} U[u.O
* The beginIndex to set. P|bow+4
*/ Mh4MaLw
publicvoid setBeginIndex(int beginIndex){ - ~|Gwr"
this.beginIndex = beginIndex; jt on \9
} ~cCMLK em
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/** NFZ(*v1U
* @return B(++*#T!^m
* Returns the currentPage. P .m@|w&.K
*/ <cp9+P <
publicint getCurrentPage(){ 'v~'NWfd
return currentPage; PnA{@n\
} JRo/ HY+
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/** ,;6 V=ok
* @param currentPage /oHCV0!0
* The currentPage to set. <[cpaZT,
*/ #mw!_]
publicvoid setCurrentPage(int currentPage){ @m9pb+=v
this.currentPage = currentPage; q\?s<l63
} $M 8&&M
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/** 31a,i2Q4
* @return \X:e9~
* Returns the everyPage. oT):#,s
*/ M}x%'=Pox
publicint getEveryPage(){ DFK@/.V
return everyPage; oCaYmi=:
} &sWr)>vs
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/** !%,7*F(
* @param everyPage jU j\<aW
* The everyPage to set. phuiLW{&
*/ *9EwZwE_K
publicvoid setEveryPage(int everyPage){ Yt]`>C[|D
this.everyPage = everyPage; 2!J#XzR0W
} II=`=H{
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/** \Y)HSJR;e
* @return Z^&G9I#
* Returns the hasNextPage. ~R
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*/ T+}|$/Tv
publicboolean getHasNextPage(){ 'K ?h6?#
return hasNextPage; *#mmk1`
} (BVqmi{
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/** tb+gCs'D
* @param hasNextPage (XO=W+<'
* The hasNextPage to set. })/P[^
*/ Yub}AuU`v
publicvoid setHasNextPage(boolean hasNextPage){ Cdz&'en^
this.hasNextPage = hasNextPage; _Sr7b#)o
} o+E~iCu5
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/** 3\XNOJH
* @return cmG27\c RO
* Returns the hasPrePage. ;{sZDjev>
*/ d&FXndC4F
publicboolean getHasPrePage(){ BV~J*e
return hasPrePage; $vegU]-R
} sN[}B{+
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/** "/Qz?1>l+
* @param hasPrePage M%S7cIX
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* The hasPrePage to set. ?'MkaG0g
*/ [gmov)\c
publicvoid setHasPrePage(boolean hasPrePage){ -qIi.]/f"9
this.hasPrePage = hasPrePage; f CU]
} *#Cx-J
@Z~YFnEJi
/** \G gh 95y
* @return Returns the totalPage. OTXZdAv
* Ib# -M;{
*/ bej(Ds0
publicint getTotalPage(){ ]->"4,}
return totalPage; S;% &X
} ,<Q
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/** |2j,
* @param totalPage =
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* The totalPage to set. >a?Bk4w
*/ v1OVrk>s>
publicvoid setTotalPage(int totalPage){ fvC,P#z'|
this.totalPage = totalPage; ]/=R ABi
} S0^a)#D &
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} C
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 6m:$mhA5
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个PageUtil,负责对Page对象进行构造: [Yt{h9
java代码: hC\
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/*Created on 2005-4-14*/ k H.dtg_
package org.flyware.util.page; r:g\
A &