Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 \m(VdE
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 #_6I w`0
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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,Yb]~s79
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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 v!<gY
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。 $c0h.t
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分页支持类: Qw-~>d
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java代码: ar__ Pf6r
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package com.javaeye.common.util; h"X;3b^ m
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import java.util.List; i,>khc
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publicclass PaginationSupport { %zG;Q@
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publicfinalstaticint PAGESIZE = 30; t;W0"ci9
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privateint pageSize = PAGESIZE; RRmz"j>
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privateList items; B<5R
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privateint totalCount; EK{Eo9l
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privateint[] indexes = newint[0]; .nrMfl_
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privateint startIndex = 0; `=4r+
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public PaginationSupport(List items, int wxKX{Bs
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totalCount){ TrlZ9?3#D
setPageSize(PAGESIZE); \y97W&AN
setTotalCount(totalCount); ZInpMp
setItems(items); NCiW^#b
setStartIndex(0); 94h]~GqNi
} IHB}`e|
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public PaginationSupport(List items, int ni.cTOSx
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totalCount, int startIndex){
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setPageSize(PAGESIZE); *:Y%HAy*
setTotalCount(totalCount); zwhe
setItems(items); Kz~ps
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setStartIndex(startIndex); gH$ Mr
} zNs55e.rx
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public PaginationSupport(List items, int g2BHHL;`
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totalCount, int pageSize, int startIndex){ z6U\axO6
setPageSize(pageSize); W<bGDh
setTotalCount(totalCount); '}9x\3E
setItems(items); qyZ"
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setStartIndex(startIndex); p,
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} %aHB"vi6
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publicList getItems(){ y`VyQWW
return items; d?ex,f.
} 8NxM4$nQX
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publicvoid setItems(List items){ CnU*Jb
this.items = items; ^|/TC!v]M
} 02f~En}>6
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publicint getPageSize(){ Ok|*!!T
return pageSize; sQ=]NF)\
} h:W;^\J:-
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publicvoid setPageSize(int pageSize){ [glLre^
this.pageSize = pageSize; rxe>}ZO
} 9eGyyZg
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publicint getTotalCount(){ n3T>QgK
return totalCount; bk[U/9Z\
} \MsTB|Z
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publicvoid setTotalCount(int totalCount){ 'vVQg
if(totalCount > 0){ %oF}HF.
this.totalCount = totalCount; t=(!\:[D
int count = totalCount / ?L5zC+c!
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pageSize; &VhroHO
if(totalCount % pageSize > 0) NiNM{[3oS
count++; ED2a}Tt>Z
indexes = newint[count]; zE336
for(int i = 0; i < count; i++){ T] R|qlZ
indexes = pageSize * c CSs
% "kPvI3Y
i; P#E &|n7DT
} q YC;cKv
}else{ 9
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this.totalCount = 0; a_[Eh fE
} QEm|])V
} V("{)0~O
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publicint[] getIndexes(){ ~9?cn
return indexes; a:+{f&
} efSM`!%j
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publicvoid setIndexes(int[] indexes){
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this.indexes = indexes; Gn22<C/
} t![7uU.W
];} Wfl
publicint getStartIndex(){ A]y`7jJ
return startIndex; &d9{k5/+\
} rJd,Rdt.
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publicvoid setStartIndex(int startIndex){ >@BnV{ d
if(totalCount <= 0) 2:*w~|6>}5
this.startIndex = 0; i}b${no
elseif(startIndex >= totalCount) ~aw.(A?MI
this.startIndex = indexes ioaU*%
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[indexes.length - 1]; ,t}vz 7
elseif(startIndex < 0) -)s qc
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this.startIndex = 0; J%8(kWQ|
else{ g6nkZyw
this.startIndex = indexes k2E0/ @f{k
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[startIndex / pageSize]; k[0-CB
} `id9j
} }{M#EP8q+
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publicint getNextIndex(){ BMhy=+\
int nextIndex = getStartIndex() + %mL-$*
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pageSize; =nz}XH%=
if(nextIndex >= totalCount) g"Ljm7
return getStartIndex(); ckV`OaRw4
else %?LOs
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return nextIndex; CPgC jtY
} "b?v?V0%C
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publicint getPreviousIndex(){ `/_o!(Z`
int previousIndex = getStartIndex() - ktI/3Mb@
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pageSize; "~E[)^ANxD
if(previousIndex < 0) ^
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return0; L}GC<D:
else *+'x~a
return previousIndex; F1 iGMf-8
} rJFc({ 0
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} Q=BZ N]g2
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抽象业务类 %cCs?ic
java代码: 3VuW#m#j
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/** XEC(P
* Created on 2005-7-12 qZ]pq2G
*/ ;WgJ<&33
package com.javaeye.common.business; KQcs3F@t
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import java.io.Serializable; x&^_c0fn
import java.util.List; <F'X<Bau
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import org.hibernate.Criteria; mK[)mC
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import org.hibernate.HibernateException; 'D6T8B4
import org.hibernate.Session; `
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import org.hibernate.criterion.DetachedCriteria;
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import org.hibernate.criterion.Projections; d cLA1sN,
import fq5_G~c=
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org.springframework.orm.hibernate3.HibernateCallback; 3=
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import uA,>a>xYI
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org.springframework.orm.hibernate3.support.HibernateDaoS RG3l.jL
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upport; |fxA|/s[<
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import com.javaeye.common.util.PaginationSupport; S;~g3DCd
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public abstract class AbstractManager extends tniDF>Rb
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HibernateDaoSupport { BYO"u6
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privateboolean cacheQueries = false; SrFS#
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privateString queryCacheRegion; *<E]E?
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publicvoid setCacheQueries(boolean
b !%hH
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cacheQueries){ <'fdkW
this.cacheQueries = cacheQueries; >w-;Z>3Q@
} %9k!A]KD
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publicvoid setQueryCacheRegion(String U~}
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queryCacheRegion){ ?OE.O/~l
this.queryCacheRegion = ]W Zq^'q.
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queryCacheRegion; Rl qQ
} a 4=N9X
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publicvoid save(finalObject entity){ G0`h %
getHibernateTemplate().save(entity); 3m>+-})d
} L lw&& K
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publicvoid persist(finalObject entity){ JOb*-q|y
getHibernateTemplate().save(entity); _(d.!qGz
} cFN'bftH4
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publicvoid update(finalObject entity){ DNR~_3Aq
getHibernateTemplate().update(entity); {^m(,K_
} 277ASCWLkU
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publicvoid delete(finalObject entity){ 28hHabd|
getHibernateTemplate().delete(entity); h'i{&mS_b
} nLwiCfe
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publicObject load(finalClass entity, FYb34LY
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finalSerializable id){ 2>]a)
return getHibernateTemplate().load l{:a1^[>y
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(entity, id); F,GN[f-
} uK("<u|
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publicObject get(finalClass entity, 6cdMS[_SD(
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finalSerializable id){ \ A%eG&
return getHibernateTemplate().get Y4F6qyP)"
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(entity, id); :s-o0$PlJ
} j'HkBW:L
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publicList findAll(finalClass entity){ _Cy:]2o
return getHibernateTemplate().find("from .fzu"XAPu
{SZ % Xb o
" + entity.getName()); GIftrYr
} #fs|BV
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publicList findByNamedQuery(finalString ]~>K\i
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namedQuery){ WlV
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return getHibernateTemplate r]P, 9
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().findByNamedQuery(namedQuery); K"<*a"1I
} q
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publicList findByNamedQuery(finalString query, T7$S_
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finalObject parameter){ +m,!e*g
return getHibernateTemplate R4e&^tI@*
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().findByNamedQuery(query, parameter); d"~(T:=r
} ;\y;
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publicList findByNamedQuery(finalString query, DB`QsiC)
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finalObject[] parameters){ 8
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return getHibernateTemplate VjbG(nB?_
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().findByNamedQuery(query, parameters); ~!+ _[uJ
} ?M6ag_h3
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publicList find(finalString query){ noNm^hFL
return getHibernateTemplate().find TSo:7&|
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(query); dL;HV8z^
} =qoRS0Qa
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publicList find(finalString query, finalObject X QbNH~
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parameter){ ARL
return getHibernateTemplate().find kI*Uk M-
*,#q'!Hq
(query, parameter); 0^_MN~s(X
} h8^i\j
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public PaginationSupport findPageByCriteria 6 ,N6jaW
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(final DetachedCriteria detachedCriteria){ 17py).\
return findPageByCriteria ER|!KtCSM
;; LuU<,$
(detachedCriteria, PaginationSupport.PAGESIZE, 0); rFXSO=P?Z
} V
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public PaginationSupport findPageByCriteria ^o%_W0_r
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(final DetachedCriteria detachedCriteria, finalint k@qWig
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startIndex){ 8[\79|
return findPageByCriteria sX'U|)/pD
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(detachedCriteria, PaginationSupport.PAGESIZE, Pc4R!Tc
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startIndex); q0|ZoP
} 5 LMj!)3
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public PaginationSupport findPageByCriteria my[,w$YM
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(final DetachedCriteria detachedCriteria, finalint 7x+=7,BZd
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pageSize, C5B=NAc
finalint startIndex){ T+W3_xIS X
return(PaginationSupport) Gmgeve
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getHibernateTemplate().execute(new HibernateCallback(){ 9L=;KtE1
publicObject doInHibernate *K!7R2Rat
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(Session session)throws HibernateException { 4^MSX+zt
Criteria criteria = x#o?>5Qg?
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detachedCriteria.getExecutableCriteria(session); hOSf'mi
int totalCount = |)';CBb
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((Integer) criteria.setProjection(Projections.rowCount v+7*R)/
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()).uniqueResult()).intValue(); cCYl$Ms kZ
criteria.setProjection Z3I L8
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(null); ?V6 %>RU
List items = |#:=\gugh
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criteria.setFirstResult(startIndex).setMaxResults ^VC7C~NZ!M
uJm #{[
(pageSize).list(); xf[zE Et
PaginationSupport ps = JYl\<Z' {
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new PaginationSupport(items, totalCount, pageSize, @>gD1Q7v b
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startIndex); dqL-'
return ps; i)GeX:
} vx PDC~3;
}, true); h<Jc;ht
} %e(9-M4*
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public List findAllByCriteria(final 9PUa?Bc`=
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DetachedCriteria detachedCriteria){ .Kg|f~InO
return(List) getHibernateTemplate (0X,Qwx
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().execute(new HibernateCallback(){ mL8A2>Gig
publicObject doInHibernate ,*q#qW!!
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(Session session)throws HibernateException { $^!a`Xr
Criteria criteria = 9"[!EKW
xI-=tib
detachedCriteria.getExecutableCriteria(session); ',L{CQA?c
return criteria.list(); HKq2Js
} %"1`
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}, true); E_ o{c5N
} E\
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public int getCountByCriteria(final N |OMj %Uk
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DetachedCriteria detachedCriteria){ [K"U_b}w
Integer count = (Integer) Xtu:
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getHibernateTemplate().execute(new HibernateCallback(){ 2r PcNh9
publicObject doInHibernate J=f:\]@Oy
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(Session session)throws HibernateException { R@)'Bs
Criteria criteria = */0vJz%<.M
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detachedCriteria.getExecutableCriteria(session); \;3B?8wbIl
return Pg!;o=
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criteria.setProjection(Projections.rowCount >!HfH(is\
1q}u?7nnSG
()).uniqueResult(); r`&2-]
} 0?J|C6XM#4
}, true); 0)6i~Mg lY
return count.intValue(); ;~'cITL
} pmow[e
} UX-_{I
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用户在web层构造查询条件detachedCriteria,和可选的 ~RZJ/%6F
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ]<\;d
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PaginationSupport的实例ps。 BST7y4R)BS
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ps.getItems()得到已分页好的结果集 p ,[XT`q^
ps.getIndexes()得到分页索引的数组 |5<&r]xN
ps.getTotalCount()得到总结果数 'Ec:l(2Ec
ps.getStartIndex()当前分页索引 pjKl)q
ps.getNextIndex()下一页索引 E.H,1 {
ps.getPreviousIndex()上一页索引 w$(0V$l_
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 8}pcanPg
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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 evg 7d
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一下代码重构了。 iw~V_y4
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我把原本我的做法也提供出来供大家讨论吧: g~^{-6Vg
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首先,为了实现分页查询,我封装了一个Page类: ]\D6;E8P-~
java代码: %.Tf u0M
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/*Created on 2005-4-14*/ x@ s`;qz
package org.flyware.util.page; \xO2WD
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/** P8,{k
* @author Joa Lx:N!RDw
* B[0,\>
*/ Er/5 ,
publicclass Page {
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j]?0}Z*
/** imply if the page has previous page */ 5KH'|z
privateboolean hasPrePage; !NAX6m
M(h H#_$
/** imply if the page has next page */ $m: a-.I
privateboolean hasNextPage; hPeKQwzC0
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/** the number of every page */ ;`of'9|
privateint everyPage; ^n45N&916
)p^jsv.
/** the total page number */ 7SY->-H8
privateint totalPage; ep}/dBg
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/** the number of current page */ ah Xq{>
privateint currentPage; w%o4MFK=!
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/** the begin index of the records by the current zkMO3w>
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query */ !zkEh9G
privateint beginIndex; &|{,4V0%A
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/** The default constructor */ <[5$ {)
public Page(){ KZ}4<{3
[;#.DH]
} Sd{"A0[A|
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/** construct the page by everyPage !BikF4Y1L&
* @param everyPage 0(g MR
* */ ?ZV0
public Page(int everyPage){ i |^`gly
this.everyPage = everyPage; +\Mm
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} $)7f%II
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/** The whole constructor */ Qn3+bF4
public Page(boolean hasPrePage, boolean hasNextPage, 8oH54bFp
?~Ed
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int everyPage, int totalPage, ,h`D(,?X
int currentPage, int beginIndex){ rtF6Lg
this.hasPrePage = hasPrePage;
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this.hasNextPage = hasNextPage; hJ*E"{xs
this.everyPage = everyPage; ![!b^:f
this.totalPage = totalPage; _po 4(U&
this.currentPage = currentPage; 0fK|}mmZA
this.beginIndex = beginIndex; ZL@DD(S-/
} ye7&y4v+
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/** MNmQ%R4jRN
* @return D"f(nVEr
* Returns the beginIndex. "wC5hj]
*/ K$GXXE`
publicint getBeginIndex(){ +i!M[
return beginIndex; +5mkMZ
} BmF>IQ`M?
[:S F(*}
/** L [M8[~Hy
* @param beginIndex 6b01xu(A[
* The beginIndex to set. =F[,-B~
*/ =~m"TQv
publicvoid setBeginIndex(int beginIndex){ =e/4Gs0*
this.beginIndex = beginIndex; O~OWRJ@p
}
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/** *)D*iU&
* @return "a{f?
.X.
* Returns the currentPage. :P"Gym
*/ X}Z%@ tL
publicint getCurrentPage(){ tp2 _OQAQ
return currentPage; 97dI4t<
} K!gFD
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/** n7uD(cL
* @param currentPage K(<P" g(
* The currentPage to set. /n:fxdhe
*/ dS=,. }
publicvoid setCurrentPage(int currentPage){ 6
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this.currentPage = currentPage; rWqA)j*!
} U .(_n
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/** }>U03aa!
* @return K$]B"
s
* Returns the everyPage. b;l%1x9r
*/ _Z2)e*(
publicint getEveryPage(){ Sn&%epi
return everyPage; 0eP~F2<bC
} p~ItHwiT
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/** #JucOWxjY
* @param everyPage _*I6O$/>
* The everyPage to set. mJ7kOQ-.$
*/ RA/yvr
publicvoid setEveryPage(int everyPage){ r+u\jZ
this.everyPage = everyPage; PX)qA=4q
} ApB0)N
d*HAKXd&:j
/** $@;[K\
* @return {*9i}w|2
* Returns the hasNextPage. UxtZBNn8
*/ [y>.)BU
publicboolean getHasNextPage(){ +i =78
return hasNextPage; |\t_I~de
} "RA$Twhj
t:7jlD!d
/** zu%pr95U
* @param hasNextPage p4 PFoFo2
* The hasNextPage to set. QNFrkel
*/ GkFNLM5'
publicvoid setHasNextPage(boolean hasNextPage){ d+'+z %s%
this.hasNextPage = hasNextPage; *TkABUL
} bX1ip2X
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/** j;.&+.
* @return )Be;Zw.|
* Returns the hasPrePage. Kw|`y %~
*/ { L5m`-x
publicboolean getHasPrePage(){ }f}&|Vap
return hasPrePage; e|P60cd /
} f
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/** yrX]w3kr%
* @param hasPrePage S EmD's
* The hasPrePage to set. j3><J
*/ 3'wBX
publicvoid setHasPrePage(boolean hasPrePage){ pif gt
this.hasPrePage = hasPrePage; h!
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} N.?Wev{
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/** ?)&TewP
* @return Returns the totalPage. 7^F?key?
* YAog;QL
*/ u(R`}C?P'
publicint getTotalPage(){ `t
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return totalPage; [g? NU]
} q3:tZoeXV
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/** y[cAU:P?
* @param totalPage *K;~V
* The totalPage to set. *sTQ9 Kr
*/ '&Ku Ba
publicvoid setTotalPage(int totalPage){ 9SPu 4i
this.totalPage = totalPage; 8c9_=8vw
} ~BC5no
V;!D:N8<
} &}]Wbk4:
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 (8I0%n}.Zo
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个PageUtil,负责对Page对象进行构造: 7G/"!ePW6`
java代码: g%Z;rDfi
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/*Created on 2005-4-14*/ mp#5Vc
package org.flyware.util.page; [\!S-:
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import org.apache.commons.logging.Log; Gqs8$[o
import org.apache.commons.logging.LogFactory; 6ugBbP +^
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/** ISl'g'o
* @author Joa aAX 8m
* Ei#"r\q j_
*/ 8Vq,J :+
publicclass PageUtil { 9+L!
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privatestaticfinal Log logger = LogFactory.getLog A81kb
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(PageUtil.class); w,\Ua&>4
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/** bC&_OU:
* Use the origin page to create a new page !_]WUQvV?
* @param page F
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* @param totalRecords lVqvS/_k$
* @return MOj 0"x)
*/ hX;xbl
publicstatic Page createPage(Page page, int K$rH{dUM
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totalRecords){ Q.!8q3`
return createPage(page.getEveryPage(), 1{DHlyA6g
aeSXHd?+(
page.getCurrentPage(), totalRecords); Nf3L
} ed&,
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/** C[~b6UP
* the basic page utils not including exception |vzGFfRI
?+51 B-
handler bj7v <G|Y
* @param everyPage xGz$M@f
* @param currentPage /\2 s%b*
* @param totalRecords Jln dypE
* @return page 8on2BC2
*/ 7:;P>sF@
publicstatic Page createPage(int everyPage, int OrHnz981K
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currentPage, int totalRecords){ .4U::j}
everyPage = getEveryPage(everyPage); E_-CsL%
currentPage = getCurrentPage(currentPage); -p9|l%W
int beginIndex = getBeginIndex(everyPage, 7ej"q
AOeptv^k3}
currentPage); 3<?#*z4]_
int totalPage = getTotalPage(everyPage, ?/NxZ\
w,D(zk$
totalRecords); WG<D+P
boolean hasNextPage = hasNextPage(currentPage, p.&FK'&[0
+K]kGF
totalPage); $--W,ov5j
boolean hasPrePage = hasPrePage(currentPage); =3Y?U*d
)9J&M