Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Qkq9oZ
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 mZ^ev;
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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 i1k#WgvZR
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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 `am]&0g^+(
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分页支持类: 7GVI={b
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java代码: /Xo8 kC
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package com.javaeye.common.util; Gn7P` t*.
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import java.util.List; oo{3-+ ?
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publicclass PaginationSupport { hEv}g
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publicfinalstaticint PAGESIZE = 30; ::eYd23
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privateint pageSize = PAGESIZE; cTQ]0<9:e
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privateList items; GoTJm}[NP
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privateint totalCount; <4m@WG
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privateint[] indexes = newint[0]; gV\{Qoj
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privateint startIndex = 0; 1{pU:/_W
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public PaginationSupport(List items, int m_pqU(sP
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totalCount){ nnol)|C{5Y
setPageSize(PAGESIZE); dqu+-43I|
setTotalCount(totalCount); *c1)x
setItems(items); Y!C8@B$MR3
setStartIndex(0); 4>I >y@^
} _I1:|y
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public PaginationSupport(List items, int quGvq"Y>
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totalCount, int startIndex){ 1#m'u5L
setPageSize(PAGESIZE); B=p6pf
setTotalCount(totalCount); q}'ww
setItems(items); mtunD;_Dek
setStartIndex(startIndex); 2MQ
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} bxrT[]
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public PaginationSupport(List items, int X@j.$0eK
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totalCount, int pageSize, int startIndex){ ].e4a;pt
setPageSize(pageSize); !/;/ X\d
setTotalCount(totalCount); &?)?
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setItems(items); ~#^suy?
setStartIndex(startIndex); Or9"T ]z
} XVwJr""+
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publicList getItems(){ D{) K00mm
return items; X{YY)}^
} , A@uSfC(
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publicvoid setItems(List items){ R5KOai!
this.items = items; "xK#%eJjWd
} !`h^S)$
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publicint getPageSize(){ iS]4F_|vd
return pageSize; jr`;H
} U-mZO7y!
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publicvoid setPageSize(int pageSize){ Vhi4_~W3j]
this.pageSize = pageSize; DY(pU/q
} h%*@82DKK
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publicint getTotalCount(){ dvX[,*wz
return totalCount; I)YUGA5
} j'QPJ(`~1l
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publicvoid setTotalCount(int totalCount){ aB*'DDlx"r
if(totalCount > 0){ wdo(K.m
this.totalCount = totalCount; 99G'`NO
int count = totalCount / ]o<&Q52 |
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pageSize; {IgLH`@
if(totalCount % pageSize > 0) MX)mm^A
count++; ;b6h/*;'
indexes = newint[count]; ALY3en9,
for(int i = 0; i < count; i++){ 4A{6)<e
indexes = pageSize * q4y sTm
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i; T?+%3z}8
} W_bp~Wu
}else{ GnFm*L
this.totalCount = 0; pg9feIW1
} s,;7m
} \0,8?S
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publicint[] getIndexes(){ ][TA7pDPV
return indexes; +
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} vXLGdv::
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publicvoid setIndexes(int[] indexes){ kuI$VC
this.indexes = indexes; JUpb*B_z
} pt_]&3\e
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publicint getStartIndex(){ [fZhfZ)<
return startIndex; lK%)a +2
} %F2T`?t:
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publicvoid setStartIndex(int startIndex){ =_=0l+\}
if(totalCount <= 0) >z|bQW#2
this.startIndex = 0; zb,YYE1
elseif(startIndex >= totalCount) i[4t`v'Dk
this.startIndex = indexes @=NTr
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[indexes.length - 1]; k@
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elseif(startIndex < 0) `P/87=h
this.startIndex = 0; ^9zlxs`<d
else{ ZuNUha&a
this.startIndex = indexes 9
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[startIndex / pageSize]; yW]>v>l:Eg
} Hg04pZupN
} oH"VrS 6
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publicint getNextIndex(){ ecMpU8}rR
int nextIndex = getStartIndex() + Ie7S'.Lmq
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pageSize; .Mxt
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if(nextIndex >= totalCount) 49tJ+J- N
return getStartIndex(); A)80qx:
else Uo0[ZsFD
return nextIndex; J;S Z"I'
} &~ '^;hy=
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publicint getPreviousIndex(){ ?Ll1B3f
int previousIndex = getStartIndex() - 95.s,'0
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pageSize; <~hx ~"c
if(previousIndex < 0) #:E^($v
return0; x }.&?m
else Ch'e'EmI
return previousIndex; ,?c=v`e
} Z jn![
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} R,+"^:}
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抽象业务类 c?}{>ig/)
java代码: i;<K)5Z
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/** bW2Msv/H
* Created on 2005-7-12 :a*F>S!
*/ c|F2 6$rv
package com.javaeye.common.business; F#Bi*YY
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import java.io.Serializable; asL!@YE
import java.util.List; A",Xn/d
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import org.hibernate.Criteria; 0IxHB|^$
import org.hibernate.HibernateException; 98I m/v
import org.hibernate.Session; SD .c9
import org.hibernate.criterion.DetachedCriteria; K_}81|=
import org.hibernate.criterion.Projections; ^:2>I $
import &`}ACTY'P
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org.springframework.orm.hibernate3.HibernateCallback; R_duPaWc@
import X=[`+=
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org.springframework.orm.hibernate3.support.HibernateDaoS _Kv;hR>
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upport; I@uin|X
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import com.javaeye.common.util.PaginationSupport; l<p6zD$l
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public abstract class AbstractManager extends 6BObV/S Jg
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HibernateDaoSupport { %iD'2e:
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privateboolean cacheQueries = false; Dw&_6\F@
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privateString queryCacheRegion; }b/G{92
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publicvoid setCacheQueries(boolean WZf}1.Mh*
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cacheQueries){
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this.cacheQueries = cacheQueries; ,,~|o3cfq
} aq$adPtu
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publicvoid setQueryCacheRegion(String +f\r?8s
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queryCacheRegion){ cxxrvP-
this.queryCacheRegion =
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queryCacheRegion; .!Os'Y9[,
} G;;iGN
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publicvoid save(finalObject entity){ |r/4
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getHibernateTemplate().save(entity); \q:PU6q
} }tPI#[cfK
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publicvoid persist(finalObject entity){ gg QI
getHibernateTemplate().save(entity); htHnQ4Q
} ZJ}|t
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publicvoid update(finalObject entity){ d1/uI^8>
getHibernateTemplate().update(entity); Q);^gV
} /Avl&Rd
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publicvoid delete(finalObject entity){ K*oWcsu
getHibernateTemplate().delete(entity); X-J<gI(Y
} Ng1uJa[k!d
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publicObject load(finalClass entity, av}pT)]\
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finalSerializable id){ zP#%ya:I
return getHibernateTemplate().load ^
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(entity, id); Q~G>=J9
} 3&7$N#v
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publicObject get(finalClass entity, 7V KTI:5y
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finalSerializable id){ C]D voJmBs
return getHibernateTemplate().get @G0j/@v
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(entity, id); 16n8[U!
} VD- 2{em
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publicList findAll(finalClass entity){ y
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return getHibernateTemplate().find("from VH5Vg We
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" + entity.getName()); t"]~e"
} K;#9:
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publicList findByNamedQuery(finalString 8Qi@z Jq,
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namedQuery){ ]BBL=$*
return getHibernateTemplate 1U;p+k5c
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().findByNamedQuery(namedQuery); ,MdK "Qa>
} ET}Dh3A
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publicList findByNamedQuery(finalString query, i-_ * 5%A
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finalObject parameter){ d}RR!i`<N
return getHibernateTemplate K\`>'C2_V
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().findByNamedQuery(query, parameter); WZJ}HHePr
} I:G4i}mA
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publicList findByNamedQuery(finalString query, 2^C>orKQ0
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finalObject[] parameters){ q+Cq&|4
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return getHibernateTemplate %#,EqN
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().findByNamedQuery(query, parameters); B
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} `t~Zkb4>
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publicList find(finalString query){ )Y}8)/Pud
return getHibernateTemplate().find 6!^&]4
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(query); #DFfySH)A
} OFe?T\dQn
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publicList find(finalString query, finalObject o7;#B)jWS
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parameter){ yxz"9PE/P
return getHibernateTemplate().find f]Q`8nU
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(query, parameter); 0xQ="aXE
} t\%gP@?
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public PaginationSupport findPageByCriteria "`4V^1
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(final DetachedCriteria detachedCriteria){ v8!Ts"
return findPageByCriteria QBI;aG<+b>
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); @?r[
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} N\9Wxz$
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public PaginationSupport findPageByCriteria ^N\$oV$
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(final DetachedCriteria detachedCriteria, finalint =~f\m:Y
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startIndex){ %}=:gF
return findPageByCriteria _pS|bqF
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(detachedCriteria, PaginationSupport.PAGESIZE, ,_(AiQK
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startIndex); efu'PfZ`&
} n$O[yRMI[
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public PaginationSupport findPageByCriteria zZax![Z
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(final DetachedCriteria detachedCriteria, finalint 7A mnxFC
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pageSize, q/lQEfR
finalint startIndex){ ?' :v):J}
return(PaginationSupport) "$Mz>]3&q
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getHibernateTemplate().execute(new HibernateCallback(){ Q'B2!9=LB
publicObject doInHibernate 6,q}1-
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(Session session)throws HibernateException { 5m]N%{<jAB
Criteria criteria = iir]M`A.-
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detachedCriteria.getExecutableCriteria(session); Z/f%$~Ch
int totalCount = <+mYC'p
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((Integer) criteria.setProjection(Projections.rowCount W1T%
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()).uniqueResult()).intValue(); 7(S66
criteria.setProjection :K)7_]y
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(null); XDdF7i}
List items = +-*Ww5Zti
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criteria.setFirstResult(startIndex).setMaxResults PV\aQO.mo
8$TSQ~
(pageSize).list(); ;qN;oSK
PaginationSupport ps = cfP9b8JG
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new PaginationSupport(items, totalCount, pageSize, qG<3H!Z!ky
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startIndex); UqwU3
return ps; CVy\']
} nde_%d$
}, true); 4Nun-(q
} _/>JM0
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public List findAllByCriteria(final u9zEhfg8
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DetachedCriteria detachedCriteria){ Bgvv6(i
return(List) getHibernateTemplate L
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().execute(new HibernateCallback(){ 'OTQiI^t=
publicObject doInHibernate o#~Lb9`@U
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(Session session)throws HibernateException { (& UQ^
Criteria criteria = F!_8?=|
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detachedCriteria.getExecutableCriteria(session); Nm7YH@x*o
return criteria.list(); Z)^1~!w0
} l{o,"P"
}, true); LpYG!K l
} {TL.2
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public int getCountByCriteria(final `]7==c #Y
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DetachedCriteria detachedCriteria){ m0Geq.
Integer count = (Integer) QB.QG!@
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getHibernateTemplate().execute(new HibernateCallback(){ rLpfybu
publicObject doInHibernate NxW
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(Session session)throws HibernateException { h0O t>e"
Criteria criteria = ZO#f)>s2
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detachedCriteria.getExecutableCriteria(session); kfV}ta'^S
return .<Rw16O
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criteria.setProjection(Projections.rowCount QJ,[K_
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()).uniqueResult(); YWFq&II|Z
} uo8[,'
}, true); omMOA
return count.intValue(); Cvp!(<<gK
} ZccvZl ;b
} 9?XQB%44
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用户在web层构造查询条件detachedCriteria,和可选的 `+m:@0&L
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 lz7?Z
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PaginationSupport的实例ps。 Lc#GBaJ
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ps.getItems()得到已分页好的结果集 z?^oy.
ps.getIndexes()得到分页索引的数组 re~T,PPM
ps.getTotalCount()得到总结果数 $*Kr4vh
ps.getStartIndex()当前分页索引 Yu$QL@
ps.getNextIndex()下一页索引 `y|_hb
ps.getPreviousIndex()上一页索引 Uv m:`e~?
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 dEZUK vo
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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 /9e?uC6
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一下代码重构了。 4*ZY#7h
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我把原本我的做法也提供出来供大家讨论吧: E<jW;trt_
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首先,为了实现分页查询,我封装了一个Page类: =C2KHNc
java代码: hvG D`
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/*Created on 2005-4-14*/ pM^Z C
package org.flyware.util.page; _6SAU8M,
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/** Cyos*
* @author Joa $g^D1zkuDT
* "[eH|z/
*/ Z5E; FGPb
publicclass Page { WfD fj
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/** imply if the page has previous page */ T](}jQxj`
privateboolean hasPrePage; RG*Vdom
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/** imply if the page has next page */ ^)wKS]BQ..
privateboolean hasNextPage; zak|* _
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/** the number of every page */ d:kn%L6k_
privateint everyPage; Wqkzj^;"G
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/** the total page number */ o{6q>Jm
privateint totalPage; \{}dn,?Fv
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/** the number of current page */ 8qqN0"{,
privateint currentPage;
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/** the begin index of the records by the current n1JtY75#,/
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query */ $&=xw _
privateint beginIndex; 8PzGUn;\
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/** The default constructor */ D#G%WT/"
public Page(){ o K>(yC[
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} oNtoqYwH
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/** construct the page by everyPage #1/~eIEY
* @param everyPage F#>00b{Q
* */ {vGJ}q?Sd"
public Page(int everyPage){ +U1
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this.everyPage = everyPage; a%e`
} hbOXR.0z
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/** The whole constructor */ &iInru3
public Page(boolean hasPrePage, boolean hasNextPage, D8<C7
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int everyPage, int totalPage, *I)J%#
int currentPage, int beginIndex){ uN:KivVe
this.hasPrePage = hasPrePage; HeO:=OE~>
this.hasNextPage = hasNextPage; kDE-GX"Y
this.everyPage = everyPage; ~\mh\a&
this.totalPage = totalPage; i1|>JM[V
this.currentPage = currentPage; .G8>UXX
this.beginIndex = beginIndex; K
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} 6q\*{_CPB
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/** !uQT4<g
* @return 4/Y?e UQ
* Returns the beginIndex. J\r\_P@;c
*/ ]bJz-6u#:
publicint getBeginIndex(){ QJ3#~GYNr
return beginIndex; VD~5]TQ
} HJ]xZ83pC
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/** V2ih/mh
* @param beginIndex pY`$k#5
* The beginIndex to set. ts!tv6@
*/ .P$m?p#
publicvoid setBeginIndex(int beginIndex){ ]:Gy]qkO
this.beginIndex = beginIndex; )Cl>% 9
} %+H _V1F
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/** BYB4-,
* @return $G-<kC}8:
* Returns the currentPage. d/bimQ
*/ wX0D^)NtF
publicint getCurrentPage(){ Tb$))O}
return currentPage; 3)y1q>CQf
} 9h amxi
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/** lN#j%0MaUo
* @param currentPage 1EXT^2!D
* The currentPage to set. >jX"
*/ &t^*0/~
publicvoid setCurrentPage(int currentPage){ -67Z!N
this.currentPage = currentPage; WM'!|lg
} d ItfR'$
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/** &KjMw:l
* @return #NW+t|E
* Returns the everyPage. az F!V
*/ #4JMb#q0E
publicint getEveryPage(){ r8s>s6vm
return everyPage; fAgeF$9@
} rO7_K>g?
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/**
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* @param everyPage "pM>TMAE
* The everyPage to set. @."K"i'Bl
*/ w.q`E@ T*
publicvoid setEveryPage(int everyPage){ "[N2qJ}p
this.everyPage = everyPage; +})QT FV
} ?4bYb]8Z
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/** rGP;0KtQ
* @return G*I
* Returns the hasNextPage. s<zN`&t
*/ ,`}yJ*7
publicboolean getHasNextPage(){ pUHgjwT'U
return hasNextPage; "E\vdhk
} ,~Mf2Y#m0p
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/** EB}B75)x
* @param hasNextPage a;xeHbE
* The hasNextPage to set. SZF 8InyF
*/ ^2~ZOP$A
publicvoid setHasNextPage(boolean hasNextPage){ ,)1C"'
this.hasNextPage = hasNextPage; SE+hB
} {Dpsr` &
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/** LP"g(D2'n
* @return f'oTN!5WF
* Returns the hasPrePage. g{V(WyT@
*/ ?>;aD
publicboolean getHasPrePage(){ G}8tFo.d1
return hasPrePage; <D.E.^Y
} d~aTjf
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/** bo=H-d|
* @param hasPrePage p6- //0qb
* The hasPrePage to set. L ci?
*/ -dM~3'
publicvoid setHasPrePage(boolean hasPrePage){ B&_:20^y~
this.hasPrePage = hasPrePage; mfj{_fR3
} 7KlL%\
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/** XZOBK^,5^B
* @return Returns the totalPage. vFe=AY<Rt|
* t\/H. Hb
*/ E<yQB39
publicint getTotalPage(){ e8`d<U
return totalPage; x<l 5wh
} WfO E I1
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/** oO
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* @param totalPage :rr<#F
* The totalPage to set. zu}uW,XH-
*/ Vx!ZF+
publicvoid setTotalPage(int totalPage){ I%4eX0QY=z
this.totalPage = totalPage; @wXYza0|d
} ":eyf3M
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} ~~{lIO)&