Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ,lm=M5b
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 d1]i,C~Y
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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 :( ,mL2[
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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 <a|@t@R
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分页支持类: G1d(,4Xp
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java代码: |cd-!iJX-
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package com.javaeye.common.util; e2w&&B-
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import java.util.List; |V|+lx'sc
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publicclass PaginationSupport { KX4],B5 +
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publicfinalstaticint PAGESIZE = 30; ,_ .v_
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privateint pageSize = PAGESIZE; `A)"%~
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privateList items; Vrkf(E3_V
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privateint totalCount; )9L/sKz
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privateint[] indexes = newint[0]; L0NA*C
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privateint startIndex = 0; :50b8
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public PaginationSupport(List items, int d@ Ja}`
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totalCount){ :iUF7P1I
setPageSize(PAGESIZE); ig!7BxM)<h
setTotalCount(totalCount); (gXN%rsY
setItems(items); Vba.uKNjk
setStartIndex(0); RU#F8O
} 1/Zh^foG
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public PaginationSupport(List items, int j
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totalCount, int startIndex){ bC6oqF'#
setPageSize(PAGESIZE); 9`B$V##-L
setTotalCount(totalCount); SA"8!soY3
setItems(items); J'T=q/
setStartIndex(startIndex); ;zH
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} <q2?S
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public PaginationSupport(List items, int oBQm05x"
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totalCount, int pageSize, int startIndex){ h2Bz F
setPageSize(pageSize); 6iA( o*'Yn
setTotalCount(totalCount); "Cz<d w]D
setItems(items); "TOa=Tt{,
setStartIndex(startIndex); c&nh>oN
} d+fSoSjX8
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publicList getItems(){ H17-/|-;0!
return items; .qv'6G
} 2kh"8oQ
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publicvoid setItems(List items){ b #fTAC;<
this.items = items; Ea $aUORm
} (eWPis[
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publicint getPageSize(){ [g|Y7.j8
return pageSize; &qM[g9
} gABr@>Vv
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publicvoid setPageSize(int pageSize){ 9pKGr@ &
this.pageSize = pageSize; F>hZ{
} /e@H^Cgo
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publicint getTotalCount(){ {FO$yw=>
return totalCount; dtt ~ Bd
} KzUlTl0
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publicvoid setTotalCount(int totalCount){ 07v!Zj
if(totalCount > 0){ 5VW|fI
this.totalCount = totalCount; #'baPqdO
int count = totalCount / ]e?x# <S
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pageSize; pc]J[ S?P
if(totalCount % pageSize > 0) !~i'
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count++; _l`e#XbG
indexes = newint[count]; Ta=s:trP
for(int i = 0; i < count; i++){ ~Ou1WnmO
indexes = pageSize * gY-5_Ab
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} nuQ]8- ,
}else{ I?#85l{>
this.totalCount = 0; E>LkJSy=
} Fh|#u:n
} [(kB
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publicint[] getIndexes(){ Fzlozx1y[
return indexes; X!hIwi A,t
} BimjQ;jtI
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publicvoid setIndexes(int[] indexes){ q<W=#Sx
this.indexes = indexes; hOv={:
} N;oQ^B'
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publicint getStartIndex(){ ^[E'1$D
return startIndex; %q;jVj[
} R:-JkV>e:
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publicvoid setStartIndex(int startIndex){ WO5O?jo'
if(totalCount <= 0) _ZB\L^j)
this.startIndex = 0; cLa]D[H
elseif(startIndex >= totalCount) Cb t{H}I3
this.startIndex = indexes B5V_e!*5F*
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[indexes.length - 1]; ^efb
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elseif(startIndex < 0) thi1kJ`L
this.startIndex = 0; _mvxsG
else{ b+-f.!j
this.startIndex = indexes r[(xjn
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[startIndex / pageSize];
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} 9fnA
} #o/H~Iv
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publicint getNextIndex(){ /M~!sPW&?
int nextIndex = getStartIndex() + cq&*.
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pageSize; `i) 2nNJ"
if(nextIndex >= totalCount) 93qwH%
return getStartIndex(); `!:q;i]}
else 1% F?B-k
return nextIndex; <$w?/y/'
} u cwnA
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publicint getPreviousIndex(){ w@-PqsF
int previousIndex = getStartIndex() - X:a`B(@S
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pageSize; /yz=Cj oz
if(previousIndex < 0) UtB6V)YI
return0; =(a1+.O
else aV o;~h~
return previousIndex; *%w69#D
} U t-B^x)gl
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} Q-Ux<#
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抽象业务类 V}d9f2
java代码: N"/-0(9[
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/** \\BCcr\l
* Created on 2005-7-12 -LDCBc"
*/ *#%9Rp2|
package com.javaeye.common.business; PkE5|d*,
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import java.io.Serializable; _LAS~x7,
import java.util.List; HkV1sT
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import org.hibernate.Criteria; w{~+EolK
import org.hibernate.HibernateException; >{eCh$L
import org.hibernate.Session; nzjkX4KV
import org.hibernate.criterion.DetachedCriteria; FJ*i\Q/D
import org.hibernate.criterion.Projections; ]sz3]"2
import Q%/<ZC.Mz6
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org.springframework.orm.hibernate3.HibernateCallback; 4!asT;`'
import Q6o(']0
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org.springframework.orm.hibernate3.support.HibernateDaoS |9"p|6G?B
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upport; a9n^WOJ6
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import com.javaeye.common.util.PaginationSupport; (>mI'!4d
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public abstract class AbstractManager extends /&u<TJ4
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HibernateDaoSupport { 0JgL2ayIVI
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privateboolean cacheQueries = false; ]0;864X0
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privateString queryCacheRegion; ]
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publicvoid setCacheQueries(boolean i>EgG5iJ
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cacheQueries){ LG~S8u
this.cacheQueries = cacheQueries; 7iHK_\t n
} Auy_K?he]
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publicvoid setQueryCacheRegion(String Qn ^bVhG+
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queryCacheRegion){ 8 #ndFpu
this.queryCacheRegion = Z5c~^jL$-
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queryCacheRegion; IHgeQ F
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} K:'q>D@
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publicvoid save(finalObject entity){ \#68;)+=
getHibernateTemplate().save(entity); ,!V]jP)
} >5R<;#8
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publicvoid persist(finalObject entity){ _U;eN|Ww
getHibernateTemplate().save(entity); "cTncL
} [-&L8Un
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publicvoid update(finalObject entity){ 0O k,oW{
getHibernateTemplate().update(entity); Qb8KPpd
} ZVeaTK4_
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publicvoid delete(finalObject entity){ ~&\ f|%
getHibernateTemplate().delete(entity); a[lY S{
} R<i38/ ~G
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publicObject load(finalClass entity, D>Gt]s
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finalSerializable id){ %{6LUn
return getHibernateTemplate().load OMwsbp&
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(entity, id); R),zl_d_
} y~IuP c
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publicObject get(finalClass entity, *m%]zj0bo
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finalSerializable id){ <
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return getHibernateTemplate().get tNVV)C
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(entity, id); 6Es?
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} ,@m@S^
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publicList findAll(finalClass entity){ smG>sEp2
return getHibernateTemplate().find("from _2b tfY1U
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" + entity.getName()); 10#oG{9
} VL'
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publicList findByNamedQuery(finalString '03->7V
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namedQuery){ Av0y?oGH
return getHibernateTemplate ~j#~\Ir
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().findByNamedQuery(namedQuery); ~)?
} fjnT e
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publicList findByNamedQuery(finalString query, XPB9~::
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finalObject parameter){ kP xa7
return getHibernateTemplate #k3t3az2{
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().findByNamedQuery(query, parameter); "^I
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} Nr2 C@FU:0
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publicList findByNamedQuery(finalString query, rQTr8DYH
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finalObject[] parameters){ 6 \B0^
return getHibernateTemplate \.XLcz
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().findByNamedQuery(query, parameters); xUF_1hY
} ]CU]pK?nq
*/ G<!W
publicList find(finalString query){ iVB^,KQ@
return getHibernateTemplate().find 4`#F^2r!
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(query); ,fEO>
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} ?Z\Yu'
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publicList find(finalString query, finalObject E^w:KC2@
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parameter){ zU6a'tP
return getHibernateTemplate().find @eqeN9e
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(query, parameter); ~-a'v!
} wPbkUVO
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public PaginationSupport findPageByCriteria &iN--~}!$
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(final DetachedCriteria detachedCriteria){ .@iFa3
return findPageByCriteria \qi|Js*{
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); qDWsvx]
} c= UU"
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public PaginationSupport findPageByCriteria sqx`">R
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(final DetachedCriteria detachedCriteria, finalint Ou'?]{
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startIndex){ }awzO#
return findPageByCriteria ?_\$
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(detachedCriteria, PaginationSupport.PAGESIZE, Dc~,D1xWj
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startIndex); v;{{ y-
} Uadr>#C*
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public PaginationSupport findPageByCriteria r%Rs0)$yj
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(final DetachedCriteria detachedCriteria, finalint elJ)4Em
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pageSize, }aB#z<B6
finalint startIndex){ xChI,~i
return(PaginationSupport) 89o)M5KQ
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getHibernateTemplate().execute(new HibernateCallback(){ i5hD#
publicObject doInHibernate _RMQy~&b
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(Session session)throws HibernateException { ;??ohA"{5
Criteria criteria = %;`>`j5
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detachedCriteria.getExecutableCriteria(session); %R_{1GrL'c
int totalCount = 8F;>5i
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((Integer) criteria.setProjection(Projections.rowCount TOl}U
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()).uniqueResult()).intValue(); pw>m.=9|y
criteria.setProjection ~WVO
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(null); ]/]ju$l9Z
List items = ,S[K{y<
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criteria.setFirstResult(startIndex).setMaxResults y_F}s9wj
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(pageSize).list(); {I%y;Aab8
PaginationSupport ps = jigs6#
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new PaginationSupport(items, totalCount, pageSize, p5c8YfM
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startIndex); <v]9lw'
return ps; (VHND%7P
} vfvlB[
}, true); !MZw#=D`
} ~HLRfL?
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public List findAllByCriteria(final mAqDjRV1
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DetachedCriteria detachedCriteria){ $,1dQeE
return(List) getHibernateTemplate wV<7pi
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().execute(new HibernateCallback(){ kv|,b
publicObject doInHibernate _ P ,@
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(Session session)throws HibernateException { ,^T]UHRO
Criteria criteria = mE$dO3
}#9(Mul
detachedCriteria.getExecutableCriteria(session); Unl?fXI
return criteria.list(); ='Oj4T
} H;vZm[\0N-
}, true); H~+xB1
} +Takde%~
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public int getCountByCriteria(final M$#sc`4*
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DetachedCriteria detachedCriteria){ /J%do]PDl
Integer count = (Integer) k0K A ~
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getHibernateTemplate().execute(new HibernateCallback(){ v+q<BYq
publicObject doInHibernate xe:' 8J6L
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(Session session)throws HibernateException { eqzTQen8q
Criteria criteria = tW6#e(^l6
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detachedCriteria.getExecutableCriteria(session); 7c1+t_ Ew
return 04-Zvp2
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criteria.setProjection(Projections.rowCount d.}}s$Q
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()).uniqueResult(); v&0d$@6/U
} ZJXqCo7O
}, true); }brr ))
return count.intValue(); vo;5f[>4i
} z-Hkz
} pcpxe&S
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用户在web层构造查询条件detachedCriteria,和可选的 @
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~= 9Vv
startIndex,调用业务bean的相应findByCriteria方法,返回一个 O]_={%
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PaginationSupport的实例ps。 a-Y6w5
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ps.getItems()得到已分页好的结果集 =
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ps.getIndexes()得到分页索引的数组 &!#2ZJ}{
ps.getTotalCount()得到总结果数 .HD ebi
ps.getStartIndex()当前分页索引 $~o3}&az
ps.getNextIndex()下一页索引 bw;iz,Z
ps.getPreviousIndex()上一页索引 *^6k[3VY
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 z (#Xca
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 5:_~mlfi
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一下代码重构了。 Jmy)J!ib*
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我把原本我的做法也提供出来供大家讨论吧: <[FS%2,0mb
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首先,为了实现分页查询,我封装了一个Page类: v['AB4
java代码: YiBOi?h9
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/*Created on 2005-4-14*/ *|CLO|B)
package org.flyware.util.page; &0i71!Oy
* T\>
/** o]
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* @author Joa gm}C\q9
* n4XMN\:g{
*/ !yk7HaP
publicclass Page { +}\29@{W
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/** imply if the page has previous page */ JN)"2}SE
privateboolean hasPrePage; =Y:5,.U
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/** imply if the page has next page */ h#;?9DP
privateboolean hasNextPage; krwf8!bI
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/** the number of every page */ 9PWm@
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privateint everyPage; ^Y#@$c
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/** the total page number */ J1& A,Gb
privateint totalPage; kS[Dy$AB/2
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/** the number of current page */ y K=S!7p\
privateint currentPage; |\rSa^:5
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/** the begin index of the records by the current }q/(D?
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query */ TIKEg10I
privateint beginIndex; fWqv3nY^
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/** The default constructor */ ,d3Q+9/
public Page(){ \;'_|bu3.
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} k`{RXx
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/** construct the page by everyPage o8iig5bp
* @param everyPage oPp!*$V
* */ Qs~d_;
public Page(int everyPage){ <e$5~Spc
this.everyPage = everyPage; ^7J~W'hI
} Q>##hG:m
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/** The whole constructor */ t*5z1T?
public Page(boolean hasPrePage, boolean hasNextPage, @G7w(>_T3
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int everyPage, int totalPage, 6yy|V~5
int currentPage, int beginIndex){ .ou!g&xu
this.hasPrePage = hasPrePage; wE-Ji<1HJ
this.hasNextPage = hasNextPage; (9Fabo\SH
this.everyPage = everyPage; |Gf1^8:C9
this.totalPage = totalPage; Tyg$`\#
this.currentPage = currentPage; <W=~UUsn
this.beginIndex = beginIndex; `%KpTh
} ~R"]LbeY
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/** G5y]^P
* @return d08`42Z69
* Returns the beginIndex. '-$))AdD
*/ 9;>@"e21R
publicint getBeginIndex(){ .rt8]%
return beginIndex; H9oXZSm
} i*mZi4URN
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/** ~0'_K1(H
* @param beginIndex )*psDjZ7*
* The beginIndex to set. bIvJs9L
*/ R=#q"9qz
publicvoid setBeginIndex(int beginIndex){ c,3'wnui
this.beginIndex = beginIndex; Ba"^K d`
} XvfcPI6
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/** ^g}gT-l%
* @return SdjUhR+o
* Returns the currentPage. c%xED%X9
*/ w~cq%%
publicint getCurrentPage(){ (`q6G d
return currentPage; mMD$X[:
} Li c{'w&
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/** fY)4]= L
* @param currentPage Nf/hr%jL
* The currentPage to set. 6ywnyh
*/ P!)7\.7
publicvoid setCurrentPage(int currentPage){ ~I/>i&