Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 x6,ozun
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 2"G9?)d9
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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 p? L%'
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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 8n5~K.;<
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分页支持类: Kzn1ct{65!
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java代码: '!^7 *@z
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package com.javaeye.common.util; G{[w+ObX
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import java.util.List; 82@^vX
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publicclass PaginationSupport { Zy+ERaF|]
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publicfinalstaticint PAGESIZE = 30; {3
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privateint pageSize = PAGESIZE; c~tl0XU1
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privateList items; |Lg2;P7\
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privateint totalCount; T*/I4"
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privateint[] indexes = newint[0]; }OEL] 5
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privateint startIndex = 0; i6HRG\9nU
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public PaginationSupport(List items, int e$s&B!qJ
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totalCount){ ^"7-`<J
setPageSize(PAGESIZE); 8p 4[:M@
setTotalCount(totalCount); 1*p6UR&
setItems(items); X[$h &]
setStartIndex(0); he~8V.$
} tn$TyCzckW
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public PaginationSupport(List items, int 4tkT\.
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totalCount, int startIndex){ 1\(
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setPageSize(PAGESIZE); [TA.|7&
setTotalCount(totalCount); /!0&b?
setItems(items); _b<;n|^
setStartIndex(startIndex); KyrZ&E.`
} OvT[JpV
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public PaginationSupport(List items, int d2eXN3"
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totalCount, int pageSize, int startIndex){ L'Cd`.yVO
setPageSize(pageSize); A4,%l\di<
setTotalCount(totalCount); BlpyE[h
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setItems(items); r5xm7- `c
setStartIndex(startIndex); X`_tm3HC
} 5[)5K?%
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publicList getItems(){ }~W/NP_F
return items; L91vp'+2
} d_we?DZ|
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publicvoid setItems(List items){ N
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this.items = items;
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} JRC2+BU
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publicint getPageSize(){ 2z{B
return pageSize; 4AEw[(t
} \bT0\
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publicvoid setPageSize(int pageSize){ Mlc_w19C9
this.pageSize = pageSize; a0)w/A&
} FiMM-c|
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publicint getTotalCount(){ gd
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return totalCount; lZRO"[<
} 3U^Vz9LW
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publicvoid setTotalCount(int totalCount){ lha;|
if(totalCount > 0){ i ZPNss
this.totalCount = totalCount; F_0D)H)N@
int count = totalCount / h;vY=r-
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pageSize; !4Zy$69R
if(totalCount % pageSize > 0) 1|8Bv0-b
count++; b;D
indexes = newint[count]; M-].l3
for(int i = 0; i < count; i++){ h._eP.W `
indexes = pageSize * !2Ompcr1
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} =c\(]xX
}else{ f|(9+~K/7&
this.totalCount = 0;
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} J>#hu3&UOQ
} ~x(|'`
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publicint[] getIndexes(){ o5J6Xi0+
return indexes; i. )^}id
} ].d%R a:{
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publicvoid setIndexes(int[] indexes){ c`x4."m
this.indexes = indexes; S -mpob)
} H.|I|XRG/
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publicint getStartIndex(){ vTFG*\Cq
return startIndex; F&uiI;+zJ
} ZRYlm$C
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publicvoid setStartIndex(int startIndex){ :vIJ>6lIR
if(totalCount <= 0) <w}^Z}fpk&
this.startIndex = 0; .! <yTh
elseif(startIndex >= totalCount) ?8kFAf~
this.startIndex = indexes 4u*n7di$9d
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[indexes.length - 1]; l[_antokn
elseif(startIndex < 0) F|6"-*[RS
this.startIndex = 0; !G vT{
else{ d)U(XiK'
this.startIndex = indexes | eCVq(R
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[startIndex / pageSize]; j~Fd8]@
} jA {BG_
} qJs_ahy(
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publicint getNextIndex(){ @su<_m6'
int nextIndex = getStartIndex() + b]?5r)GK
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pageSize; +dLUq2
if(nextIndex >= totalCount) ShVR{gIs
return getStartIndex(); Wn6m$ =
else e;~(7/1
return nextIndex; c.1gQy$}|
} Y(`Bc8h
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publicint getPreviousIndex(){ l'[;q '
int previousIndex = getStartIndex() - cQLPgE0
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pageSize; d, g~.iS~
if(previousIndex < 0) %pWJ2J@
return0; ,F->*=
else G6{PrV#
return previousIndex; ?glx8@
} aC=2v7*
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} NUb$PT
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抽象业务类 :j3^p8]
java代码: J
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/** FZU1WBNL%t
* Created on 2005-7-12 X&aQR[X
*/ FTEC=j$ln
package com.javaeye.common.business; xcl;~"c*
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import java.io.Serializable; 82r{V:NCK)
import java.util.List; !7~4`D
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import org.hibernate.Criteria; o$->|k
import org.hibernate.HibernateException; a}` M[%d7
import org.hibernate.Session; 4e\w C
import org.hibernate.criterion.DetachedCriteria; fA?Wf[`x
import org.hibernate.criterion.Projections; (&)uWjq
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import p cUccQ
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org.springframework.orm.hibernate3.HibernateCallback; Y:+:>[F
import "Ltp]nCR
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org.springframework.orm.hibernate3.support.HibernateDaoS $l.8
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upport; $A74V[1^
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import com.javaeye.common.util.PaginationSupport; i)cG
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public abstract class AbstractManager extends Z>w@3$\z
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HibernateDaoSupport { hC{2LLu;n
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privateboolean cacheQueries = false; f]2gjQHM
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privateString queryCacheRegion; MwD+'5
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publicvoid setCacheQueries(boolean c uAp,!
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cacheQueries){ liB~vdqj
this.cacheQueries = cacheQueries; *a_QuEw_k
} .'+JA:3R
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publicvoid setQueryCacheRegion(String ZA_~o#0%
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queryCacheRegion){ >>R)?24,<
this.queryCacheRegion = ;1,#rTs
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queryCacheRegion; # 6?2 2Os
} WH $*\IGJL
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publicvoid save(finalObject entity){ ?OO !M
getHibernateTemplate().save(entity); `ALQSo~l
} #/`MYh=!W
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publicvoid persist(finalObject entity){ OB(~zUe.R
getHibernateTemplate().save(entity); DVs$3RL
} ?|2m0~%V=
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publicvoid update(finalObject entity){ 9p02K@wkD
getHibernateTemplate().update(entity); $1 Z3yb^
} -xH3}K%
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publicvoid delete(finalObject entity){ y fS
getHibernateTemplate().delete(entity); D 5Z7?Y
} 75Bn p9
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publicObject load(finalClass entity, )d
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finalSerializable id){ _cfAJ)8=
return getHibernateTemplate().load lg (>n&
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(entity, id); VJgf,
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} ZZ0b!{qj3
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publicObject get(finalClass entity, ,tBc%&.f
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finalSerializable id){ WIwGw %_~
return getHibernateTemplate().get X~; *zYd5
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(entity, id); [nsTO5G$u
} h7]>b'H
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publicList findAll(finalClass entity){ mxvV~X%
return getHibernateTemplate().find("from !G~\9
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" + entity.getName()); b{e|~v6&
} Ce3
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publicList findByNamedQuery(finalString V SH64
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namedQuery){ |-AR)Smt
return getHibernateTemplate ~Oj-W6-+&,
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().findByNamedQuery(namedQuery); ZcN%F)htm
} O
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publicList findByNamedQuery(finalString query, $J:~jY/J
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finalObject parameter){ 9c@\-Z'
return getHibernateTemplate lFM'F [-?-
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().findByNamedQuery(query, parameter); "l09Ae'V
} w+ibY
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publicList findByNamedQuery(finalString query, kmL~H1qd
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finalObject[] parameters){ {[B` q
return getHibernateTemplate A832z`
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().findByNamedQuery(query, parameters); m4T`Tg#P
} nr9cG/"
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publicList find(finalString query){ 6sRKbp|r7
return getHibernateTemplate().find h<2O+"^
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(query); =:'a)o
} |a Ht6F
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publicList find(finalString query, finalObject p>]2o\["
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parameter){ o[eIwGxZ
return getHibernateTemplate().find j]_"MMwk$<
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(query, parameter); bPdbKi{j@
} ]+0I8eerd
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public PaginationSupport findPageByCriteria )wYbcH
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(final DetachedCriteria detachedCriteria){ M}6? |ir
return findPageByCriteria $lrq*Nf9c
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 'roZ:NE
} x-{awP
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public PaginationSupport findPageByCriteria ~v<,6BS<$Z
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(final DetachedCriteria detachedCriteria, finalint w,FOq?j^k
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startIndex){ sh"\ kk9
return findPageByCriteria 7e-l`]
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(detachedCriteria, PaginationSupport.PAGESIZE, ]LhNP}c
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startIndex); a<X<hxW:
} wMB<^zZmv
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public PaginationSupport findPageByCriteria ojH-;|f
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(final DetachedCriteria detachedCriteria, finalint 9WuKW***
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pageSize, Gv}h/zu-
finalint startIndex){ ~?{"H<
return(PaginationSupport) Z*|qbu)
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getHibernateTemplate().execute(new HibernateCallback(){ '
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publicObject doInHibernate :bgi*pR{
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(Session session)throws HibernateException { ~T[m{8uh
Criteria criteria = AcYL3
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detachedCriteria.getExecutableCriteria(session); MW+]w~7_Q
int totalCount = b|*A%?m
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((Integer) criteria.setProjection(Projections.rowCount RSY{IY
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()).uniqueResult()).intValue(); { LJRdV
criteria.setProjection YDyi6x,
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(null); ,wlh0;,
List items = q*<Df=+B
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criteria.setFirstResult(startIndex).setMaxResults 1qb 3.
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(pageSize).list(); Bk1Q.Un
PaginationSupport ps = .Go 3'$'v
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new PaginationSupport(items, totalCount, pageSize, h30~2]hH
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startIndex); 0%^m
return ps; <c{RY.1[
} -_ [Z5%B
}, true); #$Z|)i]w
} ;Q2p~-0Q
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public List findAllByCriteria(final QO)Q%K,
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DetachedCriteria detachedCriteria){ &Fl^&&1C
return(List) getHibernateTemplate zTP3JOe(
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().execute(new HibernateCallback(){ Oav^BhUO
publicObject doInHibernate INrUvD/*
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(Session session)throws HibernateException { :(Feg 2c
Criteria criteria = -C5Qh&~W
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detachedCriteria.getExecutableCriteria(session); w8(qiU
return criteria.list(); _~DFZt@T
} y?M99Vo4?
}, true); 'wX'}3_/g
} h2u>CXD
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public int getCountByCriteria(final g0^%X9s
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DetachedCriteria detachedCriteria){ $_l@k=
Integer count = (Integer)
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getHibernateTemplate().execute(new HibernateCallback(){ ZSMOq4Y 9
publicObject doInHibernate
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fdCsn:
(Session session)throws HibernateException { .Lp0_R@
Criteria criteria = a$FELlMv
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detachedCriteria.getExecutableCriteria(session); Sg0 _ l(
return Y=4 ,d4uu
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criteria.setProjection(Projections.rowCount l9q
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()).uniqueResult(); v.,C"^W
} Srz.-,2 PF
}, true); .) B _~tct
return count.intValue(); Q4Q*5>
} 'j!7
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} 6pQ#Zg()vp
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用户在web层构造查询条件detachedCriteria,和可选的 r%$-F2.p
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 v/Z}|dT"
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PaginationSupport的实例ps。 $d!Sl
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ps.getItems()得到已分页好的结果集 ![:S~x1
ps.getIndexes()得到分页索引的数组 +?(2-RBd
ps.getTotalCount()得到总结果数 n4ce)N@
ps.getStartIndex()当前分页索引 ;vF8V`f
ps.getNextIndex()下一页索引 "a6
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ps.getPreviousIndex()上一页索引 lbgnO s,
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 As1Er[>
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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 f| 3`8JU
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一下代码重构了。 r&xqsZ%R
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我把原本我的做法也提供出来供大家讨论吧: Yk:fV &]
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首先,为了实现分页查询,我封装了一个Page类: =6j
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java代码: <h
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/*Created on 2005-4-14*/ ]<4Yor}t{;
package org.flyware.util.page; /[GOs*{zB
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/** sxO_K^eD
* @author Joa #:vos VqG
* WMZa6cH
*/ =q^o6{d0"
publicclass Page { =5%jKHo+9z
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/** imply if the page has previous page */ "(/|[7D)
privateboolean hasPrePage; l?a(=
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/** imply if the page has next page */ )dJM
privateboolean hasNextPage; Nt&}T
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/** the number of every page */ FI*.2rdSR
privateint everyPage; \"_;rJ{!aE
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/** the total page number */ iyu%o9_0
privateint totalPage; \Q*3/_}G
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/** the number of current page */ >('L2]4\v
privateint currentPage; :{LVS
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/** the begin index of the records by the current AT+|}B!
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query */ E[nW B"pxE
privateint beginIndex; =9YyUAJZ
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/** The default constructor */ }^?dK3~q
public Page(){ 68Wm=j.m
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} 7SXi#{
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/** construct the page by everyPage t{!}^{
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* @param everyPage kdQ=%
* */ E^1uZI\z
public Page(int everyPage){ RX=C)q2c
this.everyPage = everyPage; !F;W#Gc
} 0$}+tq+
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/** The whole constructor */ X LA
public Page(boolean hasPrePage, boolean hasNextPage, W5_t/_EWD
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int everyPage, int totalPage, a%;$l_wVT:
int currentPage, int beginIndex){ *J8j_-i,R
this.hasPrePage = hasPrePage; 2y
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this.hasNextPage = hasNextPage; eAu3,qoM
this.everyPage = everyPage; #R305
this.totalPage = totalPage; 3r+vp yu
this.currentPage = currentPage; =o{zw+|% %
this.beginIndex = beginIndex; ',kYZay
} Xn$]DE/r}N
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/** 9j:?s;B
* @return He)v:AH
* Returns the beginIndex. l
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*/ L;fhJ~r
publicint getBeginIndex(){ O#Xq0o
return beginIndex; I#Iu:,OT
} K}`.?6O
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/** ut& RKr3
* @param beginIndex +S^Uw'L$=T
* The beginIndex to set. zg)Z2?K|;u
*/ t \DS}3pv
publicvoid setBeginIndex(int beginIndex){ V2i*PK
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this.beginIndex = beginIndex; lsY5QE:Qrp
} s#)fnNQ,
9"=:\PE
/** 46Nl];g1`
* @return *1ku2e]z
* Returns the currentPage. #kA/,qyM
*/ IA$:r@QNx8
publicint getCurrentPage(){ SL pd~ZC?
return currentPage; *;Hvx32I
} 7$Bq.Lc#z
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/** mJ#u] tiL
* @param currentPage 4FGcCE3
* The currentPage to set. %$`pD
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*/ r<UZ\d -
publicvoid setCurrentPage(int currentPage){ 6Nj\N oS
this.currentPage = currentPage; |M)'@s:
} BtVuI5*h
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/** E2LpQNvN%g
* @return <[ 8at6;
* Returns the everyPage. jGb+bN5U7
*/ qI^6}PB
publicint getEveryPage(){ 3"6lPUS
return everyPage; X*]uLgbl
} +sQ=Uw#e
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/** w%S\)wjS
* @param everyPage [,8@oM#
* The everyPage to set. >y(;k|-$
*/ zp!{u{
publicvoid setEveryPage(int everyPage){ v'`C16&^]
this.everyPage = everyPage; deQ0)A 4g
} &Jk0SUk MP
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/** Fv.}w_
* @return Gi6sl_"q
* Returns the hasNextPage. h-<('w:A
*/ vCFMO3
publicboolean getHasNextPage(){ ['tGc{4
return hasNextPage; 7xMvf<1P
} ;R@zf1UYA
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/** ">v76%>Z7
* @param hasNextPage \WQ\q
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* The hasNextPage to set. J)x-Yhe
*/ 4~P{H/]
publicvoid setHasNextPage(boolean hasNextPage){ A'c0zWV2
this.hasNextPage = hasNextPage; _o'ii
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} ?y>P
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/** 1}Tbp_
* @return [v^T]L
* Returns the hasPrePage. CJz2.yd
*/ =!GUQLS{
publicboolean getHasPrePage(){ K;k_MA310
return hasPrePage; /$|C s
} 4;<?ec(dc
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/** <ZSH1~<{6
* @param hasPrePage V\W?@V9g-
* The hasPrePage to set. Qo4]_,kR
*/ po4seW!
publicvoid setHasPrePage(boolean hasPrePage){ Yev] Lp
this.hasPrePage = hasPrePage; ~4"adOv
} P%8
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/** ?w#V<3=
* @return Returns the totalPage. -=H*(M
* 07[A&