Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 3R<ME c
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 {k_ PMl0G
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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 [!J
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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 ?qf:_G
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分页支持类: }t@f|TX
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java代码: 3}>:
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package com.javaeye.common.util; pBSq%Hy:
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import java.util.List; ~rgf{oGz
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publicclass PaginationSupport { w8 ?Pb$Fe
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publicfinalstaticint PAGESIZE = 30; qZ8|B
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privateint pageSize = PAGESIZE; TJHN/Z/
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privateList items; =@xN(](
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privateint totalCount; l5FuMk-
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privateint[] indexes = newint[0]; BW'L.*2
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privateint startIndex = 0; cm@jt\D
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public PaginationSupport(List items, int bK?1MiXb
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totalCount){ :dc"b?Ch
setPageSize(PAGESIZE); GXT]K>LA
setTotalCount(totalCount); |. J,8~x
setItems(items); E|HSwTHe
setStartIndex(0); 9U#\nXM
} Z{Vxr*9oO
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public PaginationSupport(List items, int +<pVf%u5
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totalCount, int startIndex){ Ef2Yl
setPageSize(PAGESIZE); y]yine
setTotalCount(totalCount); jMN)?6$=
setItems(items); u|(Ux~O
setStartIndex(startIndex); 4^0d)+Ff
} Sp 7u_Pq{
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public PaginationSupport(List items, int `%$8cZ-kr
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totalCount, int pageSize, int startIndex){ `+roQX.p
setPageSize(pageSize); C1h#x'k
setTotalCount(totalCount); y\^@p=e
setItems(items); O {PW
setStartIndex(startIndex); nAIH`L"X
} 5JS ZLC
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publicList getItems(){ nY OY"'z
return items; +J"' 'cZ
} ;c1relR2
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publicvoid setItems(List items){ 4F}Pu<;
this.items = items; ( V$Zc0
} 9 0X?1
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publicint getPageSize(){ 2ubmsbt$
return pageSize; {bT9VZ>
} <v]z6B@9!
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publicvoid setPageSize(int pageSize){ ID)^vwn
this.pageSize = pageSize; gh TcB
} 8jRs=I
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publicint getTotalCount(){ -7k[Vg?
return totalCount; wAw42{M
} ^uia`sOP4
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publicvoid setTotalCount(int totalCount){ v9u<F6
if(totalCount > 0){ ERF,tLa!
this.totalCount = totalCount; w'A tf
int count = totalCount / '0]r<O
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pageSize; Yg/}ghF\
if(totalCount % pageSize > 0) q7|:^#{av
count++; #;`Oj
indexes = newint[count]; 27m@|M] R
for(int i = 0; i < count; i++){ uM<|@`&b
indexes = pageSize * jk )Vb
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i; ZI,j?i6\
} y`4{!CEyLW
}else{ ;> DHD*3X
this.totalCount = 0; }<=3W5+
} W]_g4,T>
} rOW;yJ[
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publicint[] getIndexes(){ %MN.O-Lc
return indexes; W@^J6sH
} O16r!6=-n
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publicvoid setIndexes(int[] indexes){ zDB"r
this.indexes = indexes; dXl]Pe|v
} |k6Ox*
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publicint getStartIndex(){ IK'F{QPH
return startIndex; Y.>kO
} gY!N3 *:
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publicvoid setStartIndex(int startIndex){ f3G1r5x
if(totalCount <= 0) C,"=}z1P
this.startIndex = 0; s O=4IBE
elseif(startIndex >= totalCount) za T_d/?J
this.startIndex = indexes 1fY>>*oP
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[indexes.length - 1]; }z
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elseif(startIndex < 0) ?W!ry7gXO
this.startIndex = 0; _42Z={pZZq
else{ xI?0N<'.*q
this.startIndex = indexes eRs&iK2y
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[startIndex / pageSize]; (0OM"`j
} 3V}(fnv
} 96=Z"
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publicint getNextIndex(){ 3C M^j<9
int nextIndex = getStartIndex() + %G[/H.7s-
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pageSize; &cc9}V)M
if(nextIndex >= totalCount) mw4JQ\
return getStartIndex(); -w]/7cH
else P$ucL~r
return nextIndex; |gv{z"
} DtI$9`~
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publicint getPreviousIndex(){ k][h9'
int previousIndex = getStartIndex() - 2JZdw
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pageSize; 59<hV?
if(previousIndex < 0) zsVcXBz
return0; XQ?fJWLU
else \GL*0NJ
return previousIndex; b+{r!D}~
} \}#@9=
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} uw33:G
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抽象业务类 DnFjEP^
java代码: XA{F:%
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/** : @6mFTV
* Created on 2005-7-12 Vb!O8xV4;+
*/ c-B/~&
package com.javaeye.common.business; R0wf#%97
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import java.io.Serializable; pOA!#Aj)
import java.util.List; BpH%STEN
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import org.hibernate.Criteria; !9]d|8!
import org.hibernate.HibernateException; ,lm=M5b
import org.hibernate.Session; %;|0
import org.hibernate.criterion.DetachedCriteria; c}-(. eu
import org.hibernate.criterion.Projections; P!e= b-T
import m Ni2b*k
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org.springframework.orm.hibernate3.HibernateCallback; z%sy$^v@vD
import I[D8""U
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org.springframework.orm.hibernate3.support.HibernateDaoS {C")#m-0
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upport; q3h'l,
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import com.javaeye.common.util.PaginationSupport; ;>>C)c4V "
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public abstract class AbstractManager extends H}ZQ?uK;
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HibernateDaoSupport { %3o`j<
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privateboolean cacheQueries = false; q
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privateString queryCacheRegion; & mt)d
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publicvoid setCacheQueries(boolean !{Z~<Ky
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cacheQueries){ QyGnDomQ
this.cacheQueries = cacheQueries; E[g*O5
}
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publicvoid setQueryCacheRegion(String 4kl Ao$
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queryCacheRegion){ ?*u*de[,
this.queryCacheRegion = S6D^3n
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queryCacheRegion; Hd &{d+B
} C6
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publicvoid save(finalObject entity){ %d;ezY '2
getHibernateTemplate().save(entity); (sTuG}
}
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publicvoid persist(finalObject entity){ 9 OT,TpA
getHibernateTemplate().save(entity); N#ioJ^}n:
} X+82[Y,mB.
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publicvoid update(finalObject entity){ k'3Wt*i
getHibernateTemplate().update(entity); 6.c^u5;
} V diJ>d[
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publicvoid delete(finalObject entity){ "r'ozf2\
getHibernateTemplate().delete(entity); |E)aT#$f'
} \Qy$I-Du
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publicObject load(finalClass entity, PXk?aJ
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finalSerializable id){ ,"2TArC'z
return getHibernateTemplate().load ~E5z"o6$
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(entity, id); >m6&bfy\q
} y 1\'(1
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publicObject get(finalClass entity, z=Cr7-
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finalSerializable id){ 5:.{oSy7n
return getHibernateTemplate().get =O$M_1lp
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(entity, id); ~bK9R0|<
} p&b5% 4P
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publicList findAll(finalClass entity){ H17-/|-;0!
return getHibernateTemplate().find("from .qv'6G
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" + entity.getName());
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} 4JyM7ePND}
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publicList findByNamedQuery(finalString 9jir*UI
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namedQuery){ 5*-3?
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return getHibernateTemplate 7^6uG6
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().findByNamedQuery(namedQuery); yd_
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} %;xOB^H^
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publicList findByNamedQuery(finalString query, Kg\R+i@#<
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finalObject parameter){ 3L5r*fa
return getHibernateTemplate U9hS<}<Ki
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().findByNamedQuery(query, parameter); RP4Ku9hk
} ~ 5"JzT
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publicList findByNamedQuery(finalString query, /0MDISQy9
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finalObject[] parameters){ R:aa+MX(1
return getHibernateTemplate V^s0fWa
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().findByNamedQuery(query, parameters); =n(3o$r(
} TI|/u$SJ<Z
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publicList find(finalString query){ @~td`Z?1y
return getHibernateTemplate().find *Mc7f ?H
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(query); \*t~==WB
} Y"g.IK`V
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publicList find(finalString query, finalObject Dh4
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parameter){ iUk-'
return getHibernateTemplate().find _i0kc,*C\
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(query, parameter); 6A
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} q!~ -(&S
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public PaginationSupport findPageByCriteria Hh;:`;}
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(final DetachedCriteria detachedCriteria){ 7r#ymQ
return findPageByCriteria k44Q):ncY7
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); da!P0x9p
} ]y{WD=T
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public PaginationSupport findPageByCriteria Y$K!7Kq
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(final DetachedCriteria detachedCriteria, finalint igL<g
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startIndex){ 5Z/7kU=I
return findPageByCriteria T4/fdORS
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(detachedCriteria, PaginationSupport.PAGESIZE, n{0Ld -zH
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startIndex); U @v*0
} PXoz*)tk
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public PaginationSupport findPageByCriteria E_z;s3AXQ
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(final DetachedCriteria detachedCriteria, finalint :'L2J
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pageSize, e> rRTN
finalint startIndex){ wBj-m
return(PaginationSupport) :e1o<JgPt
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getHibernateTemplate().execute(new HibernateCallback(){ ,QIF &
publicObject doInHibernate [jdFA<Is
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(Session session)throws HibernateException { e1myH6$W
Criteria criteria = %VJ85^B3
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detachedCriteria.getExecutableCriteria(session); ZIR0PQh\
int totalCount = P;[OWSR[d
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((Integer) criteria.setProjection(Projections.rowCount WO5O?jo'
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()).uniqueResult()).intValue(); }TQ{`a@
criteria.setProjection \`V$
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(null); Y/<lWbj*A
List items = ]M>9ULQ
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criteria.setFirstResult(startIndex).setMaxResults 1LJuCI=~
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(pageSize).list(); -$VZtex
PaginationSupport ps = D-Vai#Cd
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new PaginationSupport(items, totalCount, pageSize, j:T/ iH!YF
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startIndex); qW:)!z3\
return ps; G|w=ez
} ,
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}, true); GDhE[of
} 4D%9Rc0 G
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public List findAllByCriteria(final #PDf,^
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DetachedCriteria detachedCriteria){ ,B(7\
return(List) getHibernateTemplate /iNa'W5\
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().execute(new HibernateCallback(){ 9Etz:?)b
publicObject doInHibernate iI@jZVk
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(Session session)throws HibernateException { v8gdU7Ll,
Criteria criteria = (6CN/A{qe
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detachedCriteria.getExecutableCriteria(session); s5.AW8X=?*
return criteria.list(); 5ercD
} !MDNE*_
}, true); )D'^3)FF
} u<q :$
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public int getCountByCriteria(final +;g{$da5
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DetachedCriteria detachedCriteria){ "\Egs)\
Integer count = (Integer) )k&a}u5y
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getHibernateTemplate().execute(new HibernateCallback(){ V@7KsB
publicObject doInHibernate K3uG2g(>2
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(Session session)throws HibernateException { KIA 2"KbjG
Criteria criteria = J89Dul l
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detachedCriteria.getExecutableCriteria(session); &
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return ""Zp:8o
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criteria.setProjection(Projections.rowCount \\BCcr\l
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()).uniqueResult(); F62V3 Xy
} IW8+_#d
}, true); 7"7rmZ
return count.intValue(); cYx4~ V^
} ^_5L"F]sP
} ihh4pD27g
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用户在web层构造查询条件detachedCriteria,和可选的 l$K,#P<)
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ^l^fD t
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PaginationSupport的实例ps。 %N;!+
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ps.getItems()得到已分页好的结果集 a $"ib
ps.getIndexes()得到分页索引的数组 87}&`
ps.getTotalCount()得到总结果数 fP3_d
ps.getStartIndex()当前分页索引 9_\'LJ
ps.getNextIndex()下一页索引 ;fw1
ps.getPreviousIndex()上一页索引 ky
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 DjU9
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 Xi?b]Z
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一下代码重构了。 )$w*V9d
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我把原本我的做法也提供出来供大家讨论吧: Cv$
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首先,为了实现分页查询,我封装了一个Page类: f<+4rHT
java代码: h/x0]@M&
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/*Created on 2005-4-14*/ ?u4INZ0W
package org.flyware.util.page; mzQ`N}]T:
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/** zkTp`>9R
* @author Joa |IunpZV
* Ngb(F84H?
*/ v+jsC`m
publicclass Page { :Rs^0F8)c
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/** imply if the page has previous page */ kc/{[ME
privateboolean hasPrePage; }M1sksk5
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/** imply if the page has next page */ t_ksvWUo
privateboolean hasNextPage; _k^0m
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/** the number of every page */ b 1&i# I?{
privateint everyPage; K^_i%~
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/** the total page number */ +A~\tK{
privateint totalPage; e4~>G?rM_
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/** the number of current page */ zEZLKWm9-
privateint currentPage; 0!z@2[Pe66
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/** the begin index of the records by the current {0! ~C=P
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query */ =AVgIv
privateint beginIndex; :V2bS
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/** The default constructor */ 9 Pw0m=4
public Page(){ 1 T130L
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} pZ#ap<|>I
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/** construct the page by everyPage 2<mW\$
* @param everyPage DmXcPJ[9
* */ R),zl_d_
public Page(int everyPage){ .1 %T
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this.everyPage = everyPage; C"lJl k9g^
} !_2n
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/** The whole constructor */ ~}K5#<
public Page(boolean hasPrePage, boolean hasNextPage, 2oJb)CB
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int everyPage, int totalPage, nW"q
int currentPage, int beginIndex){ y*{Zbz#{
this.hasPrePage = hasPrePage; Rl|4S[
this.hasNextPage = hasNextPage; [i0Hm)Bd3
this.everyPage = everyPage; k%y9aO
this.totalPage = totalPage; fQLt=Lrp
this.currentPage = currentPage; ,@m@S^
this.beginIndex = beginIndex; |*RYq2y
} T5Dw0Y6u,
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/** %+ZJhHT
* @return $,xnU.n
* Returns the beginIndex. bqanFQj
*/ O4<g%.HC6
publicint getBeginIndex(){ Ev!{n
return beginIndex; @|a>&~xX
} v#=`%]mL
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/** b;|55Y
* @param beginIndex KYJjwXT28W
* The beginIndex to set. ~)?
*/ fjnT e
publicvoid setBeginIndex(int beginIndex){ `[zQf
this.beginIndex = beginIndex; XPB9~::
} :|o<SZ
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/** #k3t3az2{
* @return 1Y_w5dU
* Returns the currentPage. "^I
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*/ Nr2 C@FU:0
publicint getCurrentPage(){ RFh"&0[
return currentPage; uS&|"*pR
} Ax oD8|
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/** xoB},Xl$D
* @param currentPage k%[3Q>5iM
* The currentPage to set. xUF_1hY
*/ RvJ['(-
publicvoid setCurrentPage(int currentPage){ N8KQz_]9I
this.currentPage = currentPage; @`FCiH M
} fAZiC+
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/** Khh0*S8.K
* @return $4jell
* Returns the everyPage. +7Kyyu)y@
*/ ( *G\g=D
publicint getEveryPage(){ M.h`&8
return everyPage; 6)pH|d.FR
} wOB azWa
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/** C1T_9}L-A
* @param everyPage c62=* ] ,
* The everyPage to set. )hwV`2>l
*/ D .vw8H3
publicvoid setEveryPage(int everyPage){ E2GGEKrW
this.everyPage = everyPage; iAY!oZR(WT
} \yrisp#`
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/** .s/fhk,
* @return *9ywXm&?
* Returns the hasNextPage. Ba\6?K
*/ 3p?KU-
publicboolean getHasNextPage(){ T+LJ*I4
return hasNextPage; ,_!6U
} ~.PP30'
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/** [NnauItI
* @param hasNextPage `SO|zz|'
* The hasNextPage to set. bg|!'1bD`5
*/ sqx`">R
publicvoid setHasNextPage(boolean hasNextPage){ F#xa`*AP
this.hasNextPage = hasNextPage; Ou'?]{
} l0*Gb
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/** ,n2i@?NHZ
* @return -#-p1^v}
* Returns the hasPrePage. D j\e@?Y
*/ DjMf,wX-{
publicboolean getHasPrePage(){ (Lh#`L?x
return hasPrePage; s!/TU{8J
} I[o*RKT'"
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/** DOm[*1@^
* @param hasPrePage 6VD1cb\lF
* The hasPrePage to set. ryO$6L
*/ S)He$B$pp
publicvoid setHasPrePage(boolean hasPrePage){ n$m"]inX
this.hasPrePage = hasPrePage; ~Lfcg*
} !BU)K'mj
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/** nW\(IkX\
* @return Returns the totalPage. \^*<
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* Y^$HrI(vq
*/ <