Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 $B9?>a|{A
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ,QA=)~;D
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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 v0!(&g3Sd
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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 *Vb#@O!
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分页支持类: lpB:lRM
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java代码: f;+.j/ +
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package com.javaeye.common.util; $6ucz'
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import java.util.List; 0.PG]K6
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publicclass PaginationSupport { UH7?JF-D
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publicfinalstaticint PAGESIZE = 30; ;K4=fHl
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privateint pageSize = PAGESIZE; j)nE!GKD(
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privateList items; qUg/mdv&
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privateint totalCount; -ciwIS9L
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privateint[] indexes = newint[0]; ]A\qI>,
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privateint startIndex = 0; V%t_,AT
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public PaginationSupport(List items, int B"88 .U}$
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totalCount){ VgY6M_V
setPageSize(PAGESIZE); q)@;8Z=_c
setTotalCount(totalCount); c/F!cW{z^
setItems(items); <Nloh+n=
setStartIndex(0); vy7?]}MvV
} 1 K^-tms
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public PaginationSupport(List items, int 5,O:"3>c
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totalCount, int startIndex){ eH*i_g'
setPageSize(PAGESIZE); 3qV~C{S
setTotalCount(totalCount); gC%$)4-:
setItems(items); cdI"=B+C\
setStartIndex(startIndex); 39~WP$GM
} &P*r66
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public PaginationSupport(List items, int juu"V]Q1
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totalCount, int pageSize, int startIndex){ \O~WMN
setPageSize(pageSize); ;<cCT!A
setTotalCount(totalCount); "}[ ]R
setItems(items); OB+ cE4$
setStartIndex(startIndex); |1<B(iB'{/
}
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publicList getItems(){ d;3f80Kd*
return items; ^"uD:f)
} 5yW}#W>
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publicvoid setItems(List items){ >r4BI}8SK<
this.items = items; u2':~h?l
} c*(=Glzn
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publicint getPageSize(){ !0Ak)Q]e'
return pageSize; A-^B?E
} hsK(09:J
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publicvoid setPageSize(int pageSize){ O|9Nl*rXz
this.pageSize = pageSize; q}E'x/s2m
} UpiZd/K
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publicint getTotalCount(){ Sl
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return totalCount; FELW?Q?k
} ,&@FToR
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publicvoid setTotalCount(int totalCount){ K)\D,5X^
if(totalCount > 0){ S4E@wLi
this.totalCount = totalCount; Idj Z2)$
int count = totalCount / OaByfo<S
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pageSize; ,yfJjV*I
if(totalCount % pageSize > 0) JmBMc}54
count++; c[C(3c|n
indexes = newint[count];
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for(int i = 0; i < count; i++){
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indexes = pageSize * $M|vIw{#
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} "/hLZl
}else{ MGo`j:0
this.totalCount = 0; %7Gq#rq
} n*~#]%4
} v=IcVHuf
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publicint[] getIndexes(){ a^&RV5o
return indexes; LsK
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} |c2;`T#`o
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publicvoid setIndexes(int[] indexes){ (d[JMO^@8
this.indexes = indexes; E/d\ebX|
} Hjy4tA7,l
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publicint getStartIndex(){ ,` $2
return startIndex; 2\Yv;J+;
} | fn%!d`2
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publicvoid setStartIndex(int startIndex){ $K1)2WG
if(totalCount <= 0) L$ju~0jl)%
this.startIndex = 0; DVBsRV)/
elseif(startIndex >= totalCount) NVDvd6
this.startIndex = indexes (Q|Y*yI
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[indexes.length - 1]; r6+IJxUd
elseif(startIndex < 0) 8ePzUc\#
this.startIndex = 0; HDhG1B"NL
else{ !Ome;gS)
this.startIndex = indexes y8|}bd<Sr
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[startIndex / pageSize]; Lo9
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} h*mKS -TC
} z9zo5Xc=
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publicint getNextIndex(){ tkdyR1-
int nextIndex = getStartIndex() + uF T5Z
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pageSize; _b[Pk;8}j;
if(nextIndex >= totalCount) \@7 4I7
return getStartIndex(); &KeD{M%
else ZD8E+]+
return nextIndex; b$B-LvHd1
} B=i%Z_r]w
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publicint getPreviousIndex(){ T%2%*oa
int previousIndex = getStartIndex() - VmTgD96
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pageSize; dQ Ao~]B
if(previousIndex < 0) M[&p[P@
return0; 2AjP2
else x=44ITe1n[
return previousIndex; p"NuR4
} U9//m=_
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} \H/}|^+@
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抽象业务类 z`|E0~{-
java代码: jx];=IC3tt
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/** YZ5[# E@l
* Created on 2005-7-12 6IL-S%EGK1
*/ Q".p5(<
package com.javaeye.common.business; lp]q%P
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import java.io.Serializable; S)A;!}RK6
import java.util.List; Ns[.guWu-
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import org.hibernate.Criteria; d#HN'(2t
import org.hibernate.HibernateException; ; 5!8LmZ0#
import org.hibernate.Session; ;:ocU?
import org.hibernate.criterion.DetachedCriteria; $/P\@|MqYQ
import org.hibernate.criterion.Projections; 8EZ,hY^
import 9CHn6 v ~)
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org.springframework.orm.hibernate3.HibernateCallback;
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import 8X=2# &)
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org.springframework.orm.hibernate3.support.HibernateDaoS 4' <y
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upport; BlfW~l'mx
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import com.javaeye.common.util.PaginationSupport; )Z@hk]@?_[
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public abstract class AbstractManager extends Oat
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HibernateDaoSupport { IS }U2d,W
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privateboolean cacheQueries = false; VN<baK%]
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privateString queryCacheRegion; N'0fB`:kz
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publicvoid setCacheQueries(boolean ny+_&l^R~(
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cacheQueries){ _1HEGX\
this.cacheQueries = cacheQueries; !o/;"'&E
} o(Ro/U(Wu
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publicvoid setQueryCacheRegion(String [E/^bM+
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queryCacheRegion){
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this.queryCacheRegion = C=PV-Ul+
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queryCacheRegion; +P"u1q*+p
} %'[ pucEF
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publicvoid save(finalObject entity){ U\", !S~<
getHibernateTemplate().save(entity); w'!J
} ju;Myi}a
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publicvoid persist(finalObject entity){ 29h_oNO
getHibernateTemplate().save(entity); fuA8jx
} gd\b]L?>O
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publicvoid update(finalObject entity){ T
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getHibernateTemplate().update(entity); O6r.q&U
} ? 1b*9G%i
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publicvoid delete(finalObject entity){ Xw9"wAj
getHibernateTemplate().delete(entity); @NJJ
} ` oXL
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publicObject load(finalClass entity, OL$^7FB
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finalSerializable id){ u&ozc
return getHibernateTemplate().load 2HJGp+H
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(entity, id); 7)+%;|~
} >R8eAR$N
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publicObject get(finalClass entity, 9mH+Ol#(
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finalSerializable id){ +\`t@Ht#
return getHibernateTemplate().get h}(GOYS)
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(entity, id); U})Z4>[bvt
} [=I==?2`X
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publicList findAll(finalClass entity){ ]%/a'[
return getHibernateTemplate().find("from ]$96#}7N
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" + entity.getName()); z6Jfu:_N!
}
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publicList findByNamedQuery(finalString 9 k>=y n
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namedQuery){ -)ag9{ *
return getHibernateTemplate H>2f M^
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().findByNamedQuery(namedQuery); " ^:$7~%bA
} |MXv
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publicList findByNamedQuery(finalString query, Pxm~2PAm
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finalObject parameter){ ;P4tqY@
return getHibernateTemplate ym)`<[T
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().findByNamedQuery(query, parameter);
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} 8q&*tpE
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publicList findByNamedQuery(finalString query, yD9<-B<)
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finalObject[] parameters){ ewcgg
return getHibernateTemplate kaj6C_k|
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().findByNamedQuery(query, parameters); ~.w Db,*
} wUz)9n 6j
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publicList find(finalString query){ *!y.!v*
return getHibernateTemplate().find lhA<wV1-9G
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(query); r'ydjy
} 5=.EngG
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publicList find(finalString query, finalObject |.Pl[y
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parameter){ mjqVP.
return getHibernateTemplate().find /RmHG
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(query, parameter); R?Or=W)i
} |O]oX[~
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public PaginationSupport findPageByCriteria nC5
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(final DetachedCriteria detachedCriteria){ &`'gO
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return findPageByCriteria O$=)
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); H19CVc\B
} k98}Jx7J)"
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public PaginationSupport findPageByCriteria _8'F I_E3
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(final DetachedCriteria detachedCriteria, finalint vK\;CSk
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startIndex){ RZ[r XV5
return findPageByCriteria )ccdfSe
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(detachedCriteria, PaginationSupport.PAGESIZE, FT*
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startIndex); ^Q?I8,4}
} !Ax 7k;T
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public PaginationSupport findPageByCriteria k'BLos1W
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(final DetachedCriteria detachedCriteria, finalint ya'@AJS
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pageSize, D n?P~%
finalint startIndex){ $W8
return(PaginationSupport) G1"=}Wt`
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getHibernateTemplate().execute(new HibernateCallback(){ ;6} *0V_!k
publicObject doInHibernate O>Nop5#o
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(Session session)throws HibernateException { ?6
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Criteria criteria = %Iv0<oU
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detachedCriteria.getExecutableCriteria(session); .Wq`qF(;
int totalCount = qu[x=LZ_
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((Integer) criteria.setProjection(Projections.rowCount U jC$Mi`O
BV&}(9z
()).uniqueResult()).intValue(); LTY@}o]\U
criteria.setProjection 1px:(8]{
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(null); T]nZ3EZ
List items = 3X{=*wvt
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criteria.setFirstResult(startIndex).setMaxResults [PrR30:
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(pageSize).list(); U"xI1fg%b
PaginationSupport ps = Z8=4cWI~;
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new PaginationSupport(items, totalCount, pageSize, V&_5q`L
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startIndex); 3Lq?Y7#KQp
return ps; =ot`V; Q>
} [pmZ0/l
}, true); P,O9On
} KW.S)+<H&
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public List findAllByCriteria(final P$@5&/]
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DetachedCriteria detachedCriteria){ mV;Egm{A\
return(List) getHibernateTemplate 4kA/W0 VG
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().execute(new HibernateCallback(){ d*1@lmV*
publicObject doInHibernate / vge@bsE
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(Session session)throws HibernateException { odquAqn
Criteria criteria = 0}Xkj)R,
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detachedCriteria.getExecutableCriteria(session); "0g1'az}
return criteria.list(); &K`[SX=
} $xS `i-|
}, true); ;G~0 VM2|
} %.b)%=
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public int getCountByCriteria(final D;<Qm,[
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DetachedCriteria detachedCriteria){ ~]A';xH&
Integer count = (Integer) k-T_,1l{
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getHibernateTemplate().execute(new HibernateCallback(){ Xt8;Pl
publicObject doInHibernate 1(!!EcU_
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(Session session)throws HibernateException { q[q#cY:0
Criteria criteria = KI$?0O
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detachedCriteria.getExecutableCriteria(session); T{|'<KT
return _q=$L
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criteria.setProjection(Projections.rowCount \GbT^!dj
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()).uniqueResult(); >lyUr*4PX
} mb?DnP,z
}, true); i2$U##-ro]
return count.intValue(); d Z"bc]z{
} dp2".
} bK("8T\?
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用户在web层构造查询条件detachedCriteria,和可选的 Ajq;\-:
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 n`6 8<ybl5
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PaginationSupport的实例ps。 .^djB
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ps.getItems()得到已分页好的结果集 _QBd3B%
ps.getIndexes()得到分页索引的数组 8+
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ps.getTotalCount()得到总结果数 f;pR8
ps.getStartIndex()当前分页索引 ~?-U
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ps.getNextIndex()下一页索引 {*t'h?b
ps.getPreviousIndex()上一页索引 Fm,A<+l@u
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 tJ.LPgfZ
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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
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一下代码重构了。 'iMI&?8u
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我把原本我的做法也提供出来供大家讨论吧: 4VaUa8 D
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首先,为了实现分页查询,我封装了一个Page类: ;csAhkf:S
java代码: xYM/{[
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/*Created on 2005-4-14*/ fPK|Nw]b
package org.flyware.util.page; &!/L^Y*+
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/** UH%?{>oRh
* @author Joa Cl<`uW3
* q'+XTal
*/ vxr3|2`
publicclass Page { :XBeGNI*#
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/** imply if the page has previous page */ StP6G ]x
privateboolean hasPrePage; fBD5K3
yql+N[
/** imply if the page has next page */ |KU>+4=
@
privateboolean hasNextPage; }[D~#Z!k
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/** the number of every page */ /
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privateint everyPage; >0@X^o
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/** the total page number */ CL9p/PJ%e
privateint totalPage; evg i\"
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/** the number of current page */ AZl|;
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privateint currentPage; %Dsa
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/** the begin index of the records by the current RS<c&{?
y"$|?187x
query */ ./5|i*ow
privateint beginIndex; RXl52#:
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/** The default constructor */ go2:D#mf
public Page(){ b0LQ$XM>8
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} @WBy:gV"
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/** construct the page by everyPage [_-CO}>
* @param everyPage y7d)[d*Mz
* */ 4y
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public Page(int everyPage){ dHf_&X2A
this.everyPage = everyPage; rS(693kb
} nF
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/** The whole constructor */ SAThY$)6
public Page(boolean hasPrePage, boolean hasNextPage, @YpA'cX7
=,gss&J!!
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int everyPage, int totalPage, .HZYSY:X
int currentPage, int beginIndex){ E# e=<R
this.hasPrePage = hasPrePage; u"pn'H
this.hasNextPage = hasNextPage; ,W{Qv<oo
this.everyPage = everyPage; x3wyIio*
this.totalPage = totalPage; /,E%)K;
this.currentPage = currentPage; 6sQ"go$}
this.beginIndex = beginIndex; z?j~ 2K<4
} I|Z5*iXqCm
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/** @f*/V e0.
* @return 5IdmKP|
* Returns the beginIndex. nV:.-JR
*/ 3e I:$1"Q
publicint getBeginIndex(){ l4;/[Q>Z
return beginIndex; sHQe0"Eo
} r^*,eF
{_^sR}%]F
/** :l3Tt<
* @param beginIndex *RxbqB-
* The beginIndex to set. .%WbXs
*/ x0Tb7y`
publicvoid setBeginIndex(int beginIndex){ iKp4@6an
this.beginIndex = beginIndex; Pb]s+1
} ;K$E;ZhPN
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/** VCbnS191*
* @return OWOj|jM
* Returns the currentPage. G;fP
*/ apGf@b
publicint getCurrentPage(){ ua4QtDSs
return currentPage; "28x-F+J
} G_42ckLq
2+"#
/** @*%5"~F
* @param currentPage @zd)]O]xH?
* The currentPage to set. *e_ /D$SC
*/ <]CO}r
publicvoid setCurrentPage(int currentPage){ tQ?? nI2
this.currentPage = currentPage; oB_{xu$6|
} Q6.},o
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/** L2Gm0 v
* @return @#8F5G#
* Returns the everyPage. 3b#KrN'
*/ 3ufUB^@4v
publicint getEveryPage(){ 5zfaqt`
return everyPage; KS(s<ip|
} {CQA@p:Y}
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/** !u\ X,.h
* @param everyPage n~K_|
* The everyPage to set. Q4c>gds`
*/ YEVH?`G
publicvoid setEveryPage(int everyPage){ zJdlHa{
this.everyPage = everyPage; / x$O6gi
} D_@r_^}
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/** r%_)7Wk*
* @return ZZl)p\r
* Returns the hasNextPage. eT}c_h)
*/ JRU)AMMU&
publicboolean getHasNextPage(){ #1V vK
return hasNextPage; ,Y9lp)w
} 7U?x8%H*
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/** IU Dp5MIuR
* @param hasNextPage XL} oYL]}&
* The hasNextPage to set. =GnDiI
*/ q1NAKcA<U
publicvoid setHasNextPage(boolean hasNextPage){ AbLOq@lrK
this.hasNextPage = hasNextPage; ;znIY&Z
} 3&3S*1b-H
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/** ~poy`h'
* @return Ov?k4kJ
* Returns the hasPrePage. mQJRq??P
*/ a8Ci 7<V
publicboolean getHasPrePage(){ oqUtW3y
return hasPrePage; g<}K^)x
} nuKjp Ap!
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/** XQlK}AK
* @param hasPrePage aSKI%<?xN
* The hasPrePage to set. mNcTO0p&
*/ Jqjb@'i
publicvoid setHasPrePage(boolean hasPrePage){ j<wg>O:s%r
this.hasPrePage = hasPrePage; ` [@
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} ur*1I/v
d;;]+%
/** R2t5T-8`c
* @return Returns the totalPage. rf]]I#C7
* oD~VK,.
*/ >,32~C
publicint getTotalPage(){ qrm~=yU%
return totalPage; mpXco *!_
} Ay2Vz>{
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/** pS*vwYA
* @param totalPage HPr5mWs:
* The totalPage to set. A*MlK"
*/ ~G5)ya-
publicvoid setTotalPage(int totalPage){ p# O%<S@?
this.totalPage = totalPage; H4^-M Sw
} M<g>z6
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} 9$UjZ$ v
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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 M/R#f9W
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个PageUtil,负责对Page对象进行构造: h_x"/z&
java代码: tY%c-m
3D;\V&([
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/*Created on 2005-4-14*/ @x"vGYKd
package org.flyware.util.page; [S-NGip
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import org.apache.commons.logging.Log; $&k zix
import org.apache.commons.logging.LogFactory; vL\wA_z"<H
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/** GfL}f9
* @author Joa q.uIZ
* q;t
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*/ \W}?4kz
publicclass PageUtil { L;E9"7Jo
[
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privatestaticfinal Log logger = LogFactory.getLog Bb8lklQ
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(PageUtil.class); b!<?,S
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/** ,R ]]]7)+
* Use the origin page to create a new page X: @nROL^7
* @param page 'S E%9
* @param totalRecords rkG*0#k
* @return SDDs}mV
*/ 8WfF: R;
publicstatic Page createPage(Page page, int HrEZ]iQ@O0
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totalRecords){ 7PHvsd"]p
return createPage(page.getEveryPage(), 2syKYHV
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page.getCurrentPage(), totalRecords); OUnt?[U\
} o&fAnpia=
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/** ^e<0-uM"s
* the basic page utils not including exception WLv( K_3Y
byyz\>yAVq
handler FyQ
* @param everyPage iV(B0z
* @param currentPage n=L;(jp<j
* @param totalRecords +cQ4u4
* @return page u5$\E]+_
*/ q8P| ]
publicstatic Page createPage(int everyPage, int =ni&*&
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currentPage, int totalRecords){ k]ptk^
everyPage = getEveryPage(everyPage); CPFd 33
currentPage = getCurrentPage(currentPage); hTf]t
int beginIndex = getBeginIndex(everyPage, <