Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 nlI3|5
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 [f!
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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 PH%'^YAl7
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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 sW'_K.z
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分页支持类: eY'nS
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java代码: `GW&*[.7
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package com.javaeye.common.util; *4NY"EwjN
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import java.util.List; n|6G\99l+M
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publicclass PaginationSupport { 8Iu6r}k?~`
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publicfinalstaticint PAGESIZE = 30; {?Y\T
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privateint pageSize = PAGESIZE; [DDe}D3C
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privateList items; 4v |i\V>M
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privateint totalCount; yYYP;N?g4k
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privateint[] indexes = newint[0]; }e/vKWfT
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privateint startIndex = 0; IN<nZ?D#
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public PaginationSupport(List items, int i&^JG/a
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totalCount){ )B"{B1(
setPageSize(PAGESIZE); d'ZB{'[8p
setTotalCount(totalCount); /;d 5p
setItems(items); dO%f ;m>#
setStartIndex(0); R!QR@*N
} H"(#Tp ZTE
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public PaginationSupport(List items, int cW_wIy\]&
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totalCount, int startIndex){ f=}T^Z<
setPageSize(PAGESIZE); aJf3rHX
setTotalCount(totalCount); %K')_NS@
setItems(items); n44 T4q
setStartIndex(startIndex); EyVu-4L:#
} m BFNg3_
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public PaginationSupport(List items, int /;+\6(+X
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totalCount, int pageSize, int startIndex){ ][tR=Y#&y5
setPageSize(pageSize); h U-FSdR
setTotalCount(totalCount); !reOYt|
setItems(items); =pi,]m
setStartIndex(startIndex); NfPWcK[
} MD;Z UAX<
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publicList getItems(){ XPqGv=CN
return items; L(K 5f7\
} R&;x_4dr^
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publicvoid setItems(List items){ MGMJeqvr
this.items = items; {*F
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} 9x!kvB6
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publicint getPageSize(){ )1B?<4
return pageSize; aaCRZKr
} \V!{z;.fA
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publicvoid setPageSize(int pageSize){ J^yqu{
this.pageSize = pageSize; 4gC(zJ
} @O'NJh{D`
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publicint getTotalCount(){ HVoPJ!K3
return totalCount; 4)D~S4{E5
}
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publicvoid setTotalCount(int totalCount){ B>:U
if(totalCount > 0){ i6k6l%
this.totalCount = totalCount; 2^
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int count = totalCount / CN ( :
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pageSize; c`\/]
if(totalCount % pageSize > 0) ]tT=jN&(
count++; y[85eM
indexes = newint[count]; qQ^CSn98J
for(int i = 0; i < count; i++){ B-w`mcqp$
indexes = pageSize * u9KT_`
)
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} /huh}&NNu
}else{ FCEmg0qdjD
this.totalCount = 0; "Y L^j~A
} d3q.i5']G
} ;@ixrj0u
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publicint[] getIndexes(){ +em!TO
return indexes; B-]bhA4|:
} !9NF@e'&!
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publicvoid setIndexes(int[] indexes){ ?2da6v,t
this.indexes = indexes; f!yl&ulKU
} 5j.@)XXe
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publicint getStartIndex(){ X9|*`h <
return startIndex; X)hpbHa
} 1ow,'FztPt
//|B?4kk
publicvoid setStartIndex(int startIndex){ ElpZzGj+
if(totalCount <= 0) x3FB`3y~s
this.startIndex = 0; r2+ZxMo|
elseif(startIndex >= totalCount) 9y&;6V.'
this.startIndex = indexes bj@R[!ss
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[indexes.length - 1]; m-\_L=QzM
elseif(startIndex < 0) YYFS
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this.startIndex = 0; j0+D99{R
else{ e#k rr
this.startIndex = indexes ]zyT_}&
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[startIndex / pageSize]; f/8&-L
} @]#[TbNo
} 0aY\(@
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publicint getNextIndex(){ &l]F&-
int nextIndex = getStartIndex() + +u=VO#IA#
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pageSize; dl8f]y#Q
if(nextIndex >= totalCount) wT- -i@@
return getStartIndex(); 0_ST2I"Ln
else \.i ejB
return nextIndex; p<'pqf
} Uaux0W
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publicint getPreviousIndex(){ kZG;\
int previousIndex = getStartIndex() - hQe78y
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pageSize; xLFMC?I
if(previousIndex < 0) K]B`&ih
return0; Q.eD:@%iE
else 8(Ptse
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return previousIndex; >gL&a#<S
} .!L{yU,
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} r`sKe
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抽象业务类 =s*c(>
java代码: )K]p^lO
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/** ( z)#}TC
* Created on 2005-7-12 V*O[8s%5v
*/ H1q,w|O9j
package com.javaeye.common.business; ;:oJFI#;
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import java.io.Serializable; +924_,zF
import java.util.List; "2-D[rYZ
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import org.hibernate.Criteria; lx5.50mI
import org.hibernate.HibernateException; ! jApV
import org.hibernate.Session; =&k[qqxg
import org.hibernate.criterion.DetachedCriteria; 9pj6`5Zn@6
import org.hibernate.criterion.Projections; u@:[ dbJ
import K@2"n|
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org.springframework.orm.hibernate3.HibernateCallback; `?[,1
import q'y<UyT6
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org.springframework.orm.hibernate3.support.HibernateDaoS A9]&w
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upport; T zS?WYF
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import com.javaeye.common.util.PaginationSupport; i9qIaG/
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public abstract class AbstractManager extends 6A=k;do
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HibernateDaoSupport { gzvgXZ1q"
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privateboolean cacheQueries = false; m*B4a9f
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privateString queryCacheRegion; AZik:C"Q
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publicvoid setCacheQueries(boolean lcEK&AtK
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cacheQueries){ = vF!
this.cacheQueries = cacheQueries; +3XaAk
} ^yl}/OD
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publicvoid setQueryCacheRegion(String ;K>'Gl
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queryCacheRegion){ U}Puq5[ ?
this.queryCacheRegion = pZ*%zt]-a
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queryCacheRegion; >L "+8N6
} nTtEv~a_n
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publicvoid save(finalObject entity){ n!SHExBp
getHibernateTemplate().save(entity); *]R5bj.!o
} `Xeiz'~f8
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publicvoid persist(finalObject entity){ 5wAKA`p"z
getHibernateTemplate().save(entity); ! N!pvK;
} .)bNi*&
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publicvoid update(finalObject entity){ $'eY-U8q
getHibernateTemplate().update(entity); -w"lW7
} :r
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publicvoid delete(finalObject entity){ ]o=ON95ja
getHibernateTemplate().delete(entity); O
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} +G"YQq'b
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publicObject load(finalClass entity, `x >6Wk1
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finalSerializable id){ R:Ih#2R
return getHibernateTemplate().load F1-C8V2H
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(entity, id); t54?<-
} 2,g4yXws5
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publicObject get(finalClass entity, @VG@|BQWa
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finalSerializable id){ |dqESl,2
return getHibernateTemplate().get biw .
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(entity, id); 88S:E7
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} 0nkC%j
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publicList findAll(finalClass entity){ y4I Qa.F
return getHibernateTemplate().find("from ^LB]
(.Ak*
" + entity.getName()); CDuA2e
} *pnaj\
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publicList findByNamedQuery(finalString 6L\]Ee
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namedQuery){ xb0,dZb
return getHibernateTemplate #%E^cGfY
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().findByNamedQuery(namedQuery); (=c,b9cb
} 3pW4Ul@e
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publicList findByNamedQuery(finalString query, rMjb,2*rC7
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finalObject parameter){ r7?nHF
return getHibernateTemplate o37oR v]
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().findByNamedQuery(query, parameter); u=]*,,5<
} yk5K8D[tV
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publicList findByNamedQuery(finalString query, ;Sg.E8
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finalObject[] parameters){ 52#6uBe
return getHibernateTemplate m2l9([u=^
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().findByNamedQuery(query, parameters); _
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} ErJ@$&7
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publicList find(finalString query){ X2%(=B
return getHibernateTemplate().find ohe[rV>EX
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(query); a.?U$F
} ~Sm6{L
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publicList find(finalString query, finalObject _$D!"z7i
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parameter){ fXl2i]L(^B
return getHibernateTemplate().find C%]qK(9vvd
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(query, parameter); SRk!HuXh
} @0t[7Nv-1
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public PaginationSupport findPageByCriteria "cBqZzkk9j
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(final DetachedCriteria detachedCriteria){ d-tg^Ot#
return findPageByCriteria ,t wB" *
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ^_P?EJ,)`
} Qf~$9?z
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public PaginationSupport findPageByCriteria &Q}%b7
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(final DetachedCriteria detachedCriteria, finalint lfC]!=2%~8
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startIndex){ n9J{f"`m
return findPageByCriteria 4`: POu&
wJq$yqos{
(detachedCriteria, PaginationSupport.PAGESIZE, Tt{z_gU6
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startIndex); R@tEC)Zn
} ;A7JX:*?y=
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public PaginationSupport findPageByCriteria SvvNk
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(final DetachedCriteria detachedCriteria, finalint ?fq!BV
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pageSize, <)(W7#Ks
finalint startIndex){ HKT, 5
return(PaginationSupport) ,i<cst)$u
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getHibernateTemplate().execute(new HibernateCallback(){ Avi_]h&
publicObject doInHibernate _<sN54
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(Session session)throws HibernateException { s>L.V2!$0
Criteria criteria = 7t<MHdw
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detachedCriteria.getExecutableCriteria(session); ?#Z4Dg
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int totalCount = \
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((Integer) criteria.setProjection(Projections.rowCount p?ccBq
g9VY{[V
()).uniqueResult()).intValue(); g\.$4N
criteria.setProjection ,3f>-mP
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(null); URbB2
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List items = ug ;Xoh5w
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criteria.setFirstResult(startIndex).setMaxResults ~:f..|JM
R"P-+T=7M
(pageSize).list(); ZBY2,%nAo
PaginationSupport ps = 9oO~UP!ag
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new PaginationSupport(items, totalCount, pageSize, },JJ!3
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startIndex); (Y7zaAG]
return ps; sw$uZ$$~#
} L{8_6s(:
}, true); x:!s+q`
s
} [*zg? ur
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public List findAllByCriteria(final [NO4Wzc
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DetachedCriteria detachedCriteria){ _r\M}lDh*
return(List) getHibernateTemplate !^su=c
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().execute(new HibernateCallback(){ M;ADL|
publicObject doInHibernate h L [ eA
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(Session session)throws HibernateException { ^-k"gLg
Criteria criteria = !a F~5P7%
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detachedCriteria.getExecutableCriteria(session); @g5y_G{SP
return criteria.list(); /ugyUpyg
} Nv36#^Z
}, true); <Jhd%O
} ?=&S?p)-<
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public int getCountByCriteria(final #d\&6'O
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DetachedCriteria detachedCriteria){ 9c)#j&2?H
Integer count = (Integer) \N0vA~N.
~>=.^
getHibernateTemplate().execute(new HibernateCallback(){ 8ex;g^e
publicObject doInHibernate eP>_CrJb
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(Session session)throws HibernateException { PJN9[Y{^3
Criteria criteria = BK%B[f*[OA
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detachedCriteria.getExecutableCriteria(session); -\?-
return ^)>( <6
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criteria.setProjection(Projections.rowCount Ju47} t%HB
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()).uniqueResult(); :\"0jQ.y|
} {HEWU<5
}, true); 3qe`#j
return count.intValue(); )>FAtE
} tf6m.
} o1(;"5MM
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用户在web层构造查询条件detachedCriteria,和可选的 :;eOhZ=_
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 n&;JW6VQS
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PaginationSupport的实例ps。 j? BL8E'
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ps.getItems()得到已分页好的结果集 x!GDS>
ps.getIndexes()得到分页索引的数组 aF?_V!#cT
ps.getTotalCount()得到总结果数 #1J,!seJ
ps.getStartIndex()当前分页索引 mU4(MjP?
ps.getNextIndex()下一页索引 PdO"e
ps.getPreviousIndex()上一页索引 cF15Mm2
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 zS;ruK%2
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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 n+=qT$w)
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一下代码重构了。 y60aJ)rAX
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我把原本我的做法也提供出来供大家讨论吧: SV t~pE+Y
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首先,为了实现分页查询,我封装了一个Page类: =p.avAuSn
java代码: QYo04`Rl
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/*Created on 2005-4-14*/ #>aq'47j
package org.flyware.util.page; F;#$Q
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/** r*b+kSh
* @author Joa lGYW[0dy
* :|V650/
*/ u=nd7:bv
publicclass Page { iqB5h|
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/** imply if the page has previous page */ &'^.>TJ\
privateboolean hasPrePage; e]1'D
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m_
/** imply if the page has next page */ 5T.U=_ag
privateboolean hasNextPage; xDw~n (*
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/** the number of every page */ %R?7u'=~
privateint everyPage; )lLeL#]FLO
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/** the total page number */ >D u=(pB
privateint totalPage; yC$m(Y12FN
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/** the number of current page */ 2Pm}wD^`
privateint currentPage; U:8]G
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/** the begin index of the records by the current w.58=Pr
dz+!yE\f$
query */ g(i6Uj~)
privateint beginIndex; sm'_0EUg
s.7=!JQ#]p
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/** The default constructor */ bu6Sp3g
public Page(){ :y7K3:d3
m2^vH+wD
} M>5OC)E
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/** construct the page by everyPage hO[_ _j8
* @param everyPage
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* */ ;SI (5rS?
public Page(int everyPage){ swZi
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this.everyPage = everyPage; `w#VYs|k
} A^FkU
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/** The whole constructor */ .n8O 3V
public Page(boolean hasPrePage, boolean hasNextPage, 7~+Fec`Ut*
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int everyPage, int totalPage, \E,2VM@6
int currentPage, int beginIndex){ ^G`6Zg;
this.hasPrePage = hasPrePage; n.c0G`
this.hasNextPage = hasNextPage; qdZ ^D
this.everyPage = everyPage; o_Z9\'u
this.totalPage = totalPage; zZPWE"u}
this.currentPage = currentPage; 7xO05)bz
this.beginIndex = beginIndex; pLe4dz WA
} 8/j|=Q,5
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/** L&s~j/pR
* @return ;UgwV/d
* Returns the beginIndex. i|z=WnF$&
*/ 0cKsGDm
publicint getBeginIndex(){ @`
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return beginIndex; ,N:^4A
} I2HV{1(i
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/** ($`IHKF1.l
* @param beginIndex @C@9Tw2Y
* The beginIndex to set. 9Br+]F_i
*/ @d{}M)6\!
publicvoid setBeginIndex(int beginIndex){ GC# [&>L
this.beginIndex = beginIndex; aNKw.S>
} BMO,eQcB
U@).jpN
/** l=9D!64
* @return pD[&,gV$
* Returns the currentPage. (BtU\f#d
*/ ^_v94!a9
publicint getCurrentPage(){ ~rO&Y{aG#
return currentPage; D3aX\ NGP
} {@L{l1|0
T_2'=7
/** En7+fQ
* @param currentPage cHr]{@7Cs
* The currentPage to set. *0,*F ~n
*/ 4w%hvJ
publicvoid setCurrentPage(int currentPage){ 5K9W5hA:D
this.currentPage = currentPage; ynra%"sd
} }Y.@:v
j
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/** }P%gwgPK
* @return 4J,6cOuW4
* Returns the everyPage. @>U9CL"
*/ +,"[0RH
publicint getEveryPage(){ Ke@Bf
return everyPage; 0e"KdsA:<U
} \4$Nx/@Q}
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/** o/
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* @param everyPage Kc
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* The everyPage to set. @.cord`
*/ Kg2@]J9m
publicvoid setEveryPage(int everyPage){ (*eX'^Q)d
this.everyPage = everyPage; |af<2(d
} n @@tO#!\
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/** _`QME r?
* @return Th,]nVsGs~
* Returns the hasNextPage. oIE(`l0l
*/ #F
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publicboolean getHasNextPage(){
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return hasNextPage; 1: cq\Y
} ~:!&