Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 )ejXeg
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 vu.S>2Wv
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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 aIt
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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 9
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分页支持类: Jn:GA@[I
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java代码: CQuvbAo
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package com.javaeye.common.util; P2:Q+j:PX
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import java.util.List; k}0
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publicclass PaginationSupport { q!oZ; $
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publicfinalstaticint PAGESIZE = 30; J0WXH/:
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privateint pageSize = PAGESIZE; F=T.*-oS3
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privateList items; o Jp_c
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privateint totalCount; u/:Sf*;?
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privateint[] indexes = newint[0]; z?_}+
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privateint startIndex = 0; +VW]%6+
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public PaginationSupport(List items, int .Zt/e>K&
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totalCount){ ?
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setPageSize(PAGESIZE); <@j
setTotalCount(totalCount); _ktSTzH0
setItems(items); ds[Z=_Ll
setStartIndex(0); C`_D{r
} -bu. *=
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public PaginationSupport(List items, int :8L61d2(
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totalCount, int startIndex){ k 5r*?Os
setPageSize(PAGESIZE); lz0]p
setTotalCount(totalCount); U"kK]Stk<
setItems(items); KQZ RzX>0
setStartIndex(startIndex); ~4` ec
} ~9;mZi1-
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public PaginationSupport(List items, int $/#)
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totalCount, int pageSize, int startIndex){ ^a 5~FI:
setPageSize(pageSize); cW/~4.v$
setTotalCount(totalCount); um;U;%?Q
setItems(items); ?gP/XjToMg
setStartIndex(startIndex); K{h]./%
} |Qq'_4:
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publicList getItems(){ sh3}0u+
return items; (8F?yBu
} HY#("=9< h
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publicvoid setItems(List items){ m,fr?d/;
this.items = items; V0B4<TTAo~
} a'fb0fz
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publicint getPageSize(){ yG_.|%e
return pageSize; RaqrVC
} ?Ir6*ZyY
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publicvoid setPageSize(int pageSize){ dQo$^?
this.pageSize = pageSize; [vJosbU;
} 9uo\&,,
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publicint getTotalCount(){ A[Xw |9
return totalCount; nW[aPQ[R
} v3]M;Y\
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publicvoid setTotalCount(int totalCount){
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if(totalCount > 0){ \EqO;A%<
this.totalCount = totalCount; !2,.C+,
int count = totalCount / u(qpdG||7
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pageSize; ^B]t4N2i
if(totalCount % pageSize > 0) {GY$J<5=
count++; 'c]&{-w<i
indexes = newint[count]; A-5%_M3\G
for(int i = 0; i < count; i++){ R``qQ;cc
indexes = pageSize * IEj`:]d
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} GR9F^Y) K{
}else{ ~Y$1OA8
this.totalCount = 0; 5
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} 3J{'|3x
} <aS1bQgaU
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publicint[] getIndexes(){ -.G0k*[d
return indexes; QUO?q+
} 36z{TWF
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publicvoid setIndexes(int[] indexes){ 23m+"4t
this.indexes = indexes; #-O4x`W>
} $$w 1%#F=
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publicint getStartIndex(){ x3
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return startIndex; ud1E@4;qf
} V"z0]DP5~
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publicvoid setStartIndex(int startIndex){ USY^
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if(totalCount <= 0) N[%IrN3
this.startIndex = 0; %\u>%s<9
elseif(startIndex >= totalCount) p_D)=Ef|&
this.startIndex = indexes J=Z"sU=
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[indexes.length - 1]; 9hQ{r 2
elseif(startIndex < 0) n$8A"'.M
this.startIndex = 0; >ZT3gp?E
else{ {[eY/)6H
this.startIndex = indexes ofV{SeD67
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[startIndex / pageSize]; n/-I7Q!;u
} @,hvXl-G *
} BRT2 =}A
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publicint getNextIndex(){ oz QL2
int nextIndex = getStartIndex() + bk|>a=o3
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pageSize; !
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if(nextIndex >= totalCount)
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return getStartIndex(); W NCd k$
else jw
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return nextIndex; juM?y'A
} FD8Hx\oF
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publicint getPreviousIndex(){ MZ.Jkf(
int previousIndex = getStartIndex() - fu/v1~X
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pageSize; Z+4J4Ka^!(
if(previousIndex < 0) 3j6$!89'
return0; 8AK#bna~-
else Q[ IaA"
return previousIndex; DLVf7/=3~
} KQh'5o&
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} crUXpD
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抽象业务类 FXIQS'
java代码: z}Q54,9m
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/** 75a3H`
* Created on 2005-7-12 (URWicaB
*/ |<OZa;c+
package com.javaeye.common.business; y5>H>NS
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import java.io.Serializable; 9R!.U\sq
import java.util.List; B>Mk "WjQ
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import org.hibernate.Criteria; Rgg(rF=K6
import org.hibernate.HibernateException; f"S^:F0
import org.hibernate.Session; l%U{Unwu
import org.hibernate.criterion.DetachedCriteria; S?&ntUah
import org.hibernate.criterion.Projections; i0hF9M
import XB2[{XH,
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org.springframework.orm.hibernate3.HibernateCallback; -(P"+g3T
import qXgg"k%A\
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org.springframework.orm.hibernate3.support.HibernateDaoS 0P z"[
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upport; kLK}N>v}X
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import com.javaeye.common.util.PaginationSupport; "??$yMW
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public abstract class AbstractManager extends J'W6NitMr
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HibernateDaoSupport { id'E_]r
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privateboolean cacheQueries = false; *Mk5*_
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privateString queryCacheRegion; `*^
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publicvoid setCacheQueries(boolean l!5fuB8
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cacheQueries){ yP.,Dh s
this.cacheQueries = cacheQueries; ]y:2OP
} ?U$H`[VF}
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publicvoid setQueryCacheRegion(String yL{X}:;}
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queryCacheRegion){ D<%/:M
this.queryCacheRegion = R<}UT
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queryCacheRegion;
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} 9\y\{DHd
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publicvoid save(finalObject entity){ ai 0am
getHibernateTemplate().save(entity); ky R=U`OW
} Qu]F<H*Y|
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publicvoid persist(finalObject entity){ "h58I)O
getHibernateTemplate().save(entity); F)XO5CBK
} ;XAj/6pm
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publicvoid update(finalObject entity){ H+lBb$
getHibernateTemplate().update(entity); 6)5Akyz4V
} [ H|ifi
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publicvoid delete(finalObject entity){ T3H\KRe6
getHibernateTemplate().delete(entity); P~xP@?I%
} B\*"rSP\
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publicObject load(finalClass entity, so=Ux2
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finalSerializable id){ }:SWgPfc
return getHibernateTemplate().load 2d:IYCl4q
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(entity, id); 4rDaJd>,
} I)s~kA.e
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publicObject get(finalClass entity, {PBm dX
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finalSerializable id){ m0M;f+^
return getHibernateTemplate().get SobOUly5{
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(entity, id); /U@T#S
} QP?eKW9 :
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publicList findAll(finalClass entity){ mto=_|gn
return getHibernateTemplate().find("from ?mq<#/qb
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" + entity.getName()); /l6r4aO2=
} GI.=\s
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publicList findByNamedQuery(finalString v$JhC'
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namedQuery){ ,RXfJh
return getHibernateTemplate .).}ffhOL
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().findByNamedQuery(namedQuery); wbImE;-Z
} "o{o9.w
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publicList findByNamedQuery(finalString query, 0r/pZ3/
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finalObject parameter){ ?7| 6jTIs
return getHibernateTemplate 8`]1Nt!*B
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().findByNamedQuery(query, parameter); n`TXmg
} r5w y]z^
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publicList findByNamedQuery(finalString query, #]vs*Sz
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finalObject[] parameters){ F?y4 L9|e
return getHibernateTemplate TQ`4dVaf
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().findByNamedQuery(query, parameters); "j*{7FBqk
} wR@"]WkR=
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publicList find(finalString query){ drkY~!a
return getHibernateTemplate().find kKlcK_b;
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(query); Z8xKg
} `{v!|.d<
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publicList find(finalString query, finalObject <RaUs2Q3.
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parameter){ [gE_\=FSKu
return getHibernateTemplate().find N)0V6q"
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(query, parameter); 8x /]H(J
} 1RM@~I$0
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public PaginationSupport findPageByCriteria tQYkH$e`/{
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(final DetachedCriteria detachedCriteria){ dd6m/3uUW
return findPageByCriteria vlSSw+r9
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); :41Ch^\E
} X:kqX[\>
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public PaginationSupport findPageByCriteria [,?5}'we
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(final DetachedCriteria detachedCriteria, finalint 24b?6^8~k
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startIndex){ vOV$H le
return findPageByCriteria JK=0juv<E
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(detachedCriteria, PaginationSupport.PAGESIZE, 5N
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startIndex); \&#IK9x{
} 0E^6"nt7N
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public PaginationSupport findPageByCriteria XFmTr@\M
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(final DetachedCriteria detachedCriteria, finalint gT0N\oU"
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pageSize, =6H
finalint startIndex){ <yg!D21Y
return(PaginationSupport) O+ghw1/
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getHibernateTemplate().execute(new HibernateCallback(){ #sHt3z)6I
publicObject doInHibernate OGWZq(c"6
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(Session session)throws HibernateException { F`8B PWUY
Criteria criteria = u?%FD~l:uU
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detachedCriteria.getExecutableCriteria(session); f3oGB*5>
int totalCount = mO8E-D*3
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((Integer) criteria.setProjection(Projections.rowCount Ra)AQ
n
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()).uniqueResult()).intValue(); u6MHdCJ0y
criteria.setProjection pz0Q@ n/X
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(null); ]@wKm1%v
List items = G;he:Bf
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criteria.setFirstResult(startIndex).setMaxResults 5[0W+W
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(pageSize).list(); ,vs# (d6 G
PaginationSupport ps = YS0^!7u
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new PaginationSupport(items, totalCount, pageSize, o>75s#=
b=
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startIndex); 3{H&{@Q
return ps; 0@>
} 0u?VnN<
}, true); (MzThGJK_
} 4)Ab]CdD
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public List findAllByCriteria(final D $&6 8
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DetachedCriteria detachedCriteria){ r8,'LZI z
return(List) getHibernateTemplate 5b$QXO
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().execute(new HibernateCallback(){ &6&$vF65c
publicObject doInHibernate /WMJ#IE
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(Session session)throws HibernateException { /RemLJP
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Criteria criteria = -GZ:}<W6+
hka`STK{
detachedCriteria.getExecutableCriteria(session); v9MliD'
return criteria.list(); M,sZ8eeq
} 6QePrf
}, true); Jix;!("
} 1
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public int getCountByCriteria(final }WnoI2
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DetachedCriteria detachedCriteria){ 51'{Jx8
Integer count = (Integer)
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getHibernateTemplate().execute(new HibernateCallback(){ :wz]d ~)
publicObject doInHibernate `P jS
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(Session session)throws HibernateException { ?P"j5
Criteria criteria = 5"z~BE7
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detachedCriteria.getExecutableCriteria(session); o?><(A|
return xM13OoU
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criteria.setProjection(Projections.rowCount bYwe/sR
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()).uniqueResult(); Ns6CxE9
} &Vbcwv@
}, true); mhMRY9 ahB
return count.intValue(); K-n]m#U4o
} O4T_p=Xc
} eb7~\|9l1i
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用户在web层构造查询条件detachedCriteria,和可选的 "tz`@3,5dN
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 |VmQ
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PaginationSupport的实例ps。 >/7[HhBT
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ps.getItems()得到已分页好的结果集 .1h1J
ps.getIndexes()得到分页索引的数组 g&O!w!T
ps.getTotalCount()得到总结果数 E[tEW0ub
ps.getStartIndex()当前分页索引 XT\Q"=FD
ps.getNextIndex()下一页索引 I=|}%WO#
ps.getPreviousIndex()上一页索引 C[nacAi
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 c'Zs2s7$
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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 yA^+<uz}
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一下代码重构了。 ePe/@g1K*
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我把原本我的做法也提供出来供大家讨论吧: 5
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首先,为了实现分页查询,我封装了一个Page类: E(0 [/N~
java代码: R2dCp|6A
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/*Created on 2005-4-14*/ kUQdi%3yY;
package org.flyware.util.page; %<;PEQQ|C
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/** 'v_VyK*w
* @author Joa #H&`wMZZ:
* H+Se
*/ "oo
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publicclass Page { }XIUz|
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/** imply if the page has previous page */ AOR(1Qyo
privateboolean hasPrePage; nfA#d-
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/** imply if the page has next page */ kac]Rh8vO
privateboolean hasNextPage; Qj(|uGqm3
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/** the number of every page */ D7OPFN7`
privateint everyPage; ^HI}bS1+|
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/** the total page number */ :WnF>zN
privateint totalPage; v= "2p8@F
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/** the number of current page */ ew\ZF qA;
privateint currentPage; 6YpP/
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/** the begin index of the records by the current 7~7_T#dTh
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query */ <hM`]/J55
privateint beginIndex; o+
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/** The default constructor */ WR@TH
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public Page(){ "I)`gy&
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} 3v7*@(y
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/** construct the page by everyPage ecG,[1];
* @param everyPage .Pi8c[
* */ PcQqdU^!
public Page(int everyPage){ t+@UC+aW
this.everyPage = everyPage; <zh N7="
} y{]iwO;
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/** The whole constructor */ FCMV1,
public Page(boolean hasPrePage, boolean hasNextPage, #gd`X|<Ch
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int everyPage, int totalPage, 5
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int currentPage, int beginIndex){ z~y=(T
this.hasPrePage = hasPrePage; ^P
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this.hasNextPage = hasNextPage; w5tcO%+k1
this.everyPage = everyPage; k x26nDT(
this.totalPage = totalPage; x=~$ik++
this.currentPage = currentPage; ofIw7D*h
this.beginIndex = beginIndex; TDo!yQ
} c1L0#L/F6"
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/** xgV(0H}Mf
* @return ,/bv3pE
* Returns the beginIndex. ytg' {)
*/ 2J5RZg9jL
publicint getBeginIndex(){ jdWA)N}kDG
return beginIndex; ! >l)*jN8
} [c_o.`S_\
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/** F.[E;gOTo
* @param beginIndex wz{]CQ 7"
* The beginIndex to set. >wOqV!0<
*/ Y3RaR
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publicvoid setBeginIndex(int beginIndex){ ]= nM|e
this.beginIndex = beginIndex; |}Wm,J
} ?ot7_ vl
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/** 0l&#%wmJ,
* @return (_aM26s
* Returns the currentPage. {i09e1
*/ ^<