Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 [<jU$93E
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 UI~ hB4V$]
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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 8}Q2!,9Q
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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 S2#@j#\
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分页支持类: 02YmV%
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java代码: IUD@Kf]S
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package com.javaeye.common.util; p]7IoO
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import java.util.List; m<J:6^H@
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publicclass PaginationSupport { (Dx p
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publicfinalstaticint PAGESIZE = 30; f`[E^zj
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privateint pageSize = PAGESIZE; BP1<:T'.q`
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privateList items; 9vCCE[9
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privateint totalCount; uSH_=^yTQ
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privateint[] indexes = newint[0]; .kB!',v\
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privateint startIndex = 0; $KS!vS7
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public PaginationSupport(List items, int gN]\#s@[
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totalCount){ HKVtO%&
setPageSize(PAGESIZE); O-3a U!L
setTotalCount(totalCount); @]Ac >&
setItems(items); 3KtJT&RuL
setStartIndex(0); eAjsMED
} /E:BEm!
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public PaginationSupport(List items, int .X:,]of
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totalCount, int startIndex){ !1Ht{cA0
setPageSize(PAGESIZE); wEQZ9?\
setTotalCount(totalCount); msQ?V&+<
setItems(items); 7"OJ,Mx%
setStartIndex(startIndex); xl@~K^c]
} %8xK BL]J
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public PaginationSupport(List items, int {vQ:4O!:
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totalCount, int pageSize, int startIndex){ F
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setPageSize(pageSize); W>'(MB$3
setTotalCount(totalCount); ZX'3qW^D
setItems(items); `^|l+TJG
setStartIndex(startIndex); 20I/En
} e`Co ='
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publicList getItems(){
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return items; 7R5+Q\W
} 1\g r
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publicvoid setItems(List items){ )jh~jU? c@
this.items = items; AS'+p %(
} 8isQL
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publicint getPageSize(){ yet~
return pageSize; yD@1H(yM
} 69`*u<{PC
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publicvoid setPageSize(int pageSize){ Z*=$n_
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this.pageSize = pageSize; l(\F2_,2W
} ?-tNRIPW@p
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publicint getTotalCount(){ +=sw&DH
return totalCount; I+31:#d
} 7m}fVLk
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publicvoid setTotalCount(int totalCount){ ,sT5TS
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if(totalCount > 0){ Y~?Z'uR
this.totalCount = totalCount; Pz0TAb
int count = totalCount / *]nk{jo2
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pageSize; A2$05a$%
if(totalCount % pageSize > 0) 0%)T]SDS
count++; k=&n>P
indexes = newint[count]; }7_$[r'_oI
for(int i = 0; i < count; i++){ E()%IC/R
indexes = pageSize * 0
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} d]MpE9@'v
}else{ OL_jU2,fv
this.totalCount = 0; X,{[R |
} Av4(=}M}@
} ) $0>L5d:
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publicint[] getIndexes(){ Ty#sY'%
return indexes; }0iHf'~DH*
} Xz9[0;Q
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publicvoid setIndexes(int[] indexes){ J~50#vHY
this.indexes = indexes; Nr).*]g@~
} >]o>iOz;]
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publicint getStartIndex(){ mI]gDL1
return startIndex; h4+*ssnYV
} d24_,o\_
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publicvoid setStartIndex(int startIndex){ >(.Y%$9"E
if(totalCount <= 0) TKgN31 `
this.startIndex = 0; qw>vu7/z
elseif(startIndex >= totalCount) "h|kf%
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this.startIndex = indexes IW-|"5?9'
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[indexes.length - 1]; 2+Oz$9`.
elseif(startIndex < 0) 9hh~u
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this.startIndex = 0; n{&;@mgI
else{ tU *`X(;
this.startIndex = indexes b=U3&CV9
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[startIndex / pageSize]; *2rc Y
} tGzp=PyA
} hljKBx~
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publicint getNextIndex(){ )lz~Rt;1i
int nextIndex = getStartIndex() + v`]y:Ku|wR
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pageSize; nF<xJs
if(nextIndex >= totalCount) \Hf/8!q
return getStartIndex(); gXM+N(M-
else OiS\tK?|GV
return nextIndex; ael] {'h]
} !IA\c(c^
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publicint getPreviousIndex(){ @|bJMi
int previousIndex = getStartIndex() - mx
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pageSize; W/}_ y8q
if(previousIndex < 0) HFlExau
return0;
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else *N}$~N
return previousIndex; Nh}u]<B
} V!>j:"
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} ~sPXkLqK
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抽象业务类 d>F. C>
java代码: ST0TWE'
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/** t`R{N1
* Created on 2005-7-12 ^!0z+M:>^
*/ m l@%H
package com.javaeye.common.business; 9qgs*]J
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import java.io.Serializable; Nu\<Xr8
import java.util.List; f-ceDn
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import org.hibernate.Criteria; 9%"`9j~H>
import org.hibernate.HibernateException; 1uCF9P
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import org.hibernate.Session; >tx[UF@P@
import org.hibernate.criterion.DetachedCriteria; pnyu&@e
import org.hibernate.criterion.Projections; Bq1}"092
import ewHs ]V+U
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org.springframework.orm.hibernate3.HibernateCallback; ?Zsh\^k.g
import 9q
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org.springframework.orm.hibernate3.support.HibernateDaoS ICr.Gwe3_
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upport; nMfR<%r
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import com.javaeye.common.util.PaginationSupport; G_,9h!e
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public abstract class AbstractManager extends I,`;#Q)nx
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HibernateDaoSupport { KfYU.Q
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privateboolean cacheQueries = false; OK8Ho"
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privateString queryCacheRegion; `wQs$!a
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publicvoid setCacheQueries(boolean s=F[.X9lp
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cacheQueries){ X1o^MMpz(F
this.cacheQueries = cacheQueries; 4>LaA7)v
} q=D8 Nz
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publicvoid setQueryCacheRegion(String 'GX x|.
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queryCacheRegion){ C"B'Dj
this.queryCacheRegion = ,UNk]vd
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queryCacheRegion; 4Orq;8!BW
} Y:L[Iz95o
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publicvoid save(finalObject entity){
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getHibernateTemplate().save(entity); #D|%r-:"
} DR:DXJc
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publicvoid persist(finalObject entity){ aq8./^
getHibernateTemplate().save(entity); UnP<`z#
} D,[Nn_N
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publicvoid update(finalObject entity){ G
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getHibernateTemplate().update(entity); ZfH>UHft
} 8ih_S2Cd
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publicvoid delete(finalObject entity){ :KA)4[#;W
getHibernateTemplate().delete(entity); O(!;7v}
} h6^|f%\w*i
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publicObject load(finalClass entity, -,T!/E
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finalSerializable id){ dcD#!v\0
return getHibernateTemplate().load &rD8ng+$
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(entity, id); [ }Tb2|
} r@qLG"[\c
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publicObject get(finalClass entity, Mj6,VD9L
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finalSerializable id){ 1'Q6l
return getHibernateTemplate().get Rvx7}ZL!
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(entity, id); 1iLo$
} 2IRARZ,3
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publicList findAll(finalClass entity){ f\_PNZCc
return getHibernateTemplate().find("from qlYi:uygY
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" + entity.getName()); .ml\z5
} #jG?{j3;?
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publicList findByNamedQuery(finalString v
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namedQuery){ o:W*#dt
return getHibernateTemplate ?%qaoxG37
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().findByNamedQuery(namedQuery); -6s:D/t1'
} !/u
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publicList findByNamedQuery(finalString query, "0[`U(/
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finalObject parameter){ <I
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return getHibernateTemplate f_[dFKoX
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().findByNamedQuery(query, parameter); ZvT,HJ0?
} 0m4M@94
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publicList findByNamedQuery(finalString query, IF|;;*Z8
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finalObject[] parameters){ l5Ko9CG
return getHibernateTemplate aF+Lam(
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().findByNamedQuery(query, parameters); gN:F5 0
} 7x>^ip"7
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publicList find(finalString query){ zEtsMU
return getHibernateTemplate().find aK;OzB)
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(query); KB|mtsi
} [r8[lkR
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publicList find(finalString query, finalObject d94k
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parameter){ gDLS)4^w
return getHibernateTemplate().find EJTM
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(query, parameter); 4c 8{AZ
} %sOY:>
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public PaginationSupport findPageByCriteria 8P-ay<6
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(final DetachedCriteria detachedCriteria){ rDbtT*vN
return findPageByCriteria Gg~0>XS
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); p<L{e~{!7f
} MQx1|>rG
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public PaginationSupport findPageByCriteria [1kQ-Ko`
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(final DetachedCriteria detachedCriteria, finalint XWS]4MB+vm
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startIndex){ d/OP+yzgZ
return findPageByCriteria e3TKQ(
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(detachedCriteria, PaginationSupport.PAGESIZE, 3w"JzC@
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startIndex); .Vnb+o
} RIXeV*ix
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public PaginationSupport findPageByCriteria B!x#|vGXL
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(final DetachedCriteria detachedCriteria, finalint ZwLr>?0$
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pageSize, \zg R]|
finalint startIndex){ eg}g}a
return(PaginationSupport) 6_QAE6A
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getHibernateTemplate().execute(new HibernateCallback(){ 5Ex[}y9L`
publicObject doInHibernate JFX}))7
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(Session session)throws HibernateException { upaP,ik}~
Criteria criteria = 8}:$=n4&
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detachedCriteria.getExecutableCriteria(session); lCp6UkE
int totalCount = C/Z#NP~ *
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((Integer) criteria.setProjection(Projections.rowCount 99ZWB
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()).uniqueResult()).intValue(); N6-7RoA+
criteria.setProjection sU&v
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(null); bH/4f93Nb
List items = 77[TqRLf
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criteria.setFirstResult(startIndex).setMaxResults u3O@ccJ;
mih}?oi
(pageSize).list(); KqJln)7
PaginationSupport ps = Lr:n
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new PaginationSupport(items, totalCount, pageSize, -+1O*L!
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startIndex); 3 5.&!4}
return ps; ( `bb1gz
} $%DoLpE>
}, true); N ~=PecQ
} )GVTa4}p
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public List findAllByCriteria(final 2yn"K|
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DetachedCriteria detachedCriteria){ <dP\vLH_
return(List) getHibernateTemplate i;C` .+
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().execute(new HibernateCallback(){ zX*5yNd
publicObject doInHibernate OXQA(%MK
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(Session session)throws HibernateException { |}z5ST%
Criteria criteria = h'&<A_C-7
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detachedCriteria.getExecutableCriteria(session); W[Q<# Ju
return criteria.list(); &Hp*A^M
} (c)/&~aE
}, true); tkHmH/'7
} )e3w-es~4
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public int getCountByCriteria(final LJ@(jO{z
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DetachedCriteria detachedCriteria){ vFdI?(c-
Integer count = (Integer) V':A!
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getHibernateTemplate().execute(new HibernateCallback(){ vb>F)po1}
publicObject doInHibernate sS
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(Session session)throws HibernateException { xS12$ib ~G
Criteria criteria = /}E2Rr?{
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detachedCriteria.getExecutableCriteria(session); [06m{QJ)1
return lmHQ"z 3G
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criteria.setProjection(Projections.rowCount #2%V
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()).uniqueResult(); 7O*Sg2B
} Cn5"zDK$
}, true); tDL.+6/
return count.intValue(); fK=0?]s}I
} qy pF}Pw
} *s 4Ym
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用户在web层构造查询条件detachedCriteria,和可选的 G?Gf,{#K
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Nm&'&L%Ch
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PaginationSupport的实例ps。 7Ji'7$
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ps.getItems()得到已分页好的结果集 a+lNXlh=
ps.getIndexes()得到分页索引的数组 %$zak@3%'
ps.getTotalCount()得到总结果数 |%5Aku0`s
ps.getStartIndex()当前分页索引 ({Md({|
ps.getNextIndex()下一页索引 \jk*Nm8;
ps.getPreviousIndex()上一页索引 l2n`fZL
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 W*S4gPGM
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 .yfp-n4H
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一下代码重构了。 :F"IOPfU5[
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我把原本我的做法也提供出来供大家讨论吧: sS{Co8EJn
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首先,为了实现分页查询,我封装了一个Page类:
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java代码: =PA?6Bm
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/*Created on 2005-4-14*/ !l#aq\:}~e
package org.flyware.util.page; i ?pd|J
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/** S+.>{0!S"
* @author Joa ^`lD w
* |X1axRO
*/ t=}]4&Yp
publicclass Page { G|nBja8vm
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/** imply if the page has previous page */ ,S
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privateboolean hasPrePage; 6e \?%,H
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/** imply if the page has next page */ <ivG(a*=]
privateboolean hasNextPage; LyvR].p=5*
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/** the number of every page */ %`s#p` Ol1
privateint everyPage; R%n*wGi_6b
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/** the total page number */ "9[2vdSX
privateint totalPage; ,OwTi:yDr
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/** the number of current page */ H~JgZ pw
privateint currentPage; {Lv"wec*x
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/** the begin index of the records by the current dr"$@
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query */ jcJ@A0]
privateint beginIndex; V /\Y(Mxc
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/** The default constructor */ FsOJmWZ
public Page(){ w3
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} 7&P70DO
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/** construct the page by everyPage Jjj;v2uSK
* @param everyPage Ppl :_Of
* */ j|[$P4w}U
public Page(int everyPage){ 3r[F1z2B
this.everyPage = everyPage; V[%IU'{:
} 6`'g ${U
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/** The whole constructor */ aJ=)5%$6kc
public Page(boolean hasPrePage, boolean hasNextPage, q0ab]g+
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int everyPage, int totalPage, k1g-%DB
int currentPage, int beginIndex){ l%Ke>9C
this.hasPrePage = hasPrePage; R*cef
this.hasNextPage = hasNextPage; W.{+0xx
this.everyPage = everyPage; H~#$AD+H
this.totalPage = totalPage; JT<JS6vw#
this.currentPage = currentPage; 'tkQz
this.beginIndex = beginIndex; MaPhG<?
} @6~m&$R/
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/** k9H}nP$F
* @return rIB./,
* Returns the beginIndex. X7K{P_5l
*/ I8@leT\9M
publicint getBeginIndex(){ F
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return beginIndex;
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} CTg79
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/** y"Fu=
* @param beginIndex -0;{
* The beginIndex to set. '6\w4J(
*/ c^H#[<6p
publicvoid setBeginIndex(int beginIndex){ f:P;_/cJc
this.beginIndex = beginIndex; lz>.mXdx
} v h)CB8
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/** o@
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* @return ->{\7|^
* Returns the currentPage. EGv]K|
*/ )!VJ\
publicint getCurrentPage(){ v;z8g^L
return currentPage; (aJ$1bT=T
} )L
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/** # ^,8JRA
* @param currentPage /8:e|
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* The currentPage to set. +6+1N)L
*/ Sa)L=5Nr
publicvoid setCurrentPage(int currentPage){ Z{%W!>0
this.currentPage = currentPage; B/Q>i'e
} e$QMR.'
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/** H 9BqE+
* @return t vW0 W
* Returns the everyPage. \jZmu
*/ cRag0.[
publicint getEveryPage(){ wS$ 'gKA6
return everyPage; V$$9Rh
} <ldArZ4C4
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/** _E0yzkS
* @param everyPage 2C"i2/NH'
* The everyPage to set. c?c"|.-<p
*/ x) %"i)
publicvoid setEveryPage(int everyPage){ -`spu)
this.everyPage = everyPage; fK(:vwh
} 7r(c@4yPI
6 AY~>p
/** })mD{c/
* @return eln$,zK/b
* Returns the hasNextPage. [<^ '}-SJ
*/ J7EWaXGbz
publicboolean getHasNextPage(){ O]="ggq&
return hasNextPage; x>K,{{B)X
} QDK }e:4q
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/** 4},Y0 QXw
* @param hasNextPage eA(FWO
* The hasNextPage to set. y^X]q[-?
*/ gm:Y@6W
publicvoid setHasNextPage(boolean hasNextPage){ u
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this.hasNextPage = hasNextPage; 8 f~M6
} ':\bn:;
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/** \Yv44*I`
* @return md9JvbB
* Returns the hasPrePage. 4/SltWU
*/ E.*wNah"U
publicboolean getHasPrePage(){ 6khm@}}
return hasPrePage; W8]?dL}|
} Qe9}%k6@E
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/** j\BtaC
* @param hasPrePage `X&