Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 P+|8MT0
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 !>);}J!e]
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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 )CTM
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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 wef^o"aP
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分页支持类: ASU\O3%%
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java代码: >^ar$T;Ys
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package com.javaeye.common.util; D;n%sRq(Z
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import java.util.List; >Ga1p'8FtU
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publicclass PaginationSupport { y5D?Bg|M
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publicfinalstaticint PAGESIZE = 30; w[G_ w:$a
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privateint pageSize = PAGESIZE; )t=u(:u]
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privateList items; JB_`lefW,'
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privateint totalCount; ~8{3Fc 0
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privateint[] indexes = newint[0]; 'vIkA=
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privateint startIndex = 0; -ix1<e
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public PaginationSupport(List items, int oA%[x
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totalCount){ >7q,[:(gs
setPageSize(PAGESIZE); gD=5M\
setTotalCount(totalCount); * v]UgPk
setItems(items); {f3fc8(p
setStartIndex(0); dw!Eao47
} wKbymmG
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public PaginationSupport(List items, int OFbg]{ub?
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totalCount, int startIndex){ 5/ju
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setPageSize(PAGESIZE); .)zISa*Xy
setTotalCount(totalCount); c3t8yifQ
setItems(items); "?,6{\y,
setStartIndex(startIndex); (\>'yW{f
} -Lb^O/
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public PaginationSupport(List items, int ZHasDZ8
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totalCount, int pageSize, int startIndex){ uy:=V}p
setPageSize(pageSize); c`; LF'!
setTotalCount(totalCount); d~8~RT2m
setItems(items);
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setStartIndex(startIndex); :L0W"$
} -=IM8Dny
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publicList getItems(){ V,5}hQJ
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return items; b\S}?{m5
} W2N 7
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publicvoid setItems(List items){ Th^#H
this.items = items; kc[["w&
} &Qjl|2
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publicint getPageSize(){ i`'^ zR(`i
return pageSize; H-w|JH>g
} < z)G& h@
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publicvoid setPageSize(int pageSize){ )&Bv\Tfjt
this.pageSize = pageSize; j}l8k@f
} ulM&kw.4i
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publicint getTotalCount(){ w'XgW0j{
return totalCount; efR$s{n!
} n#cN[C9
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publicvoid setTotalCount(int totalCount){ f tDV3If
if(totalCount > 0){ k;7.qhe:
this.totalCount = totalCount; >IjLFM+U
int count = totalCount / ![^h<Om
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pageSize; .?RjH6W
if(totalCount % pageSize > 0) *,
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count++; e`F|sz]k"H
indexes = newint[count]; mA@+4&
for(int i = 0; i < count; i++){ pa-4|)qY
indexes = pageSize * C<XDQ>?
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} G1tp
}else{ K/cK6Yr
this.totalCount = 0; nUHVPuQ/'T
} O%e.u>=4%
} GR
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publicint[] getIndexes(){ F2'cL @E3
return indexes; [hbp#I~*[
} #57z-x[1
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publicvoid setIndexes(int[] indexes){
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this.indexes = indexes; IIiN1
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} mM>|fHGA
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publicint getStartIndex(){ pr(\?\a
return startIndex; taaAwTtk?A
} eCD,[At/
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publicvoid setStartIndex(int startIndex){ 7+4"+CA
if(totalCount <= 0) 8ZfIh
this.startIndex = 0; ^MV%\0o
elseif(startIndex >= totalCount) c F]3gM
this.startIndex = indexes =lQ[%&
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[indexes.length - 1]; bz]O(`
elseif(startIndex < 0) |3ETF|)?
this.startIndex = 0; $t'I*k^N
else{ B)8Hj).@B
this.startIndex = indexes vI}S6-"<
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[startIndex / pageSize]; ;jI"|v{vnS
} 'U$VOq?!
} W=]",<
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publicint getNextIndex(){ #SNI
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int nextIndex = getStartIndex() + Qe.kNdT+_
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pageSize; Q@VnJ,
if(nextIndex >= totalCount) ^I?y\:.
return getStartIndex(); ;NeEgqW"
else MiM=fIuw@s
return nextIndex; ?ovGYzUZ
} tdF[2@?+
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publicint getPreviousIndex(){ ;@~*z4U
int previousIndex = getStartIndex() - :Xh`.*{EX
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pageSize; 5V8C+k)
if(previousIndex < 0) :9#{p^:o
return0; z}8L}:
else o;_bs~}y
return previousIndex; #q.G_-H4J@
} 6*33k'=;F
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} $OoN/^kv
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抽象业务类 fhx:EZ:~
java代码: ){6)?[G
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/** v};qMceJ
* Created on 2005-7-12 X$Vz
*/ $50"3g!Y
package com.javaeye.common.business; }(EOQ2TI
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import java.io.Serializable; WTs[Sud/
import java.util.List; G11.6]?Gg
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import org.hibernate.Criteria; `h5eej&s(
import org.hibernate.HibernateException; y@\Q@
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import org.hibernate.Session; ?QT"sj64w
import org.hibernate.criterion.DetachedCriteria; }_l
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import org.hibernate.criterion.Projections; o
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import E wsq0D
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org.springframework.orm.hibernate3.HibernateCallback; Sb4PCt
import qpqz. {\
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org.springframework.orm.hibernate3.support.HibernateDaoS 3N0X?* (x|
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upport; Cy:`pYxhd
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import com.javaeye.common.util.PaginationSupport; m{dyVE
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public abstract class AbstractManager extends ^J~A+CEf"W
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HibernateDaoSupport { P`IG9
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privateboolean cacheQueries = false; mCNf]Yz
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privateString queryCacheRegion; ,xD*^>!
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publicvoid setCacheQueries(boolean *@n3>$
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cacheQueries){ s_Oh >y?Aq
this.cacheQueries = cacheQueries; ;Pqyu
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} f"<@6Axq
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publicvoid setQueryCacheRegion(String j*~dFGl)
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queryCacheRegion){
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this.queryCacheRegion = zo7XmUI3P
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queryCacheRegion; ~73i^3yf
} lH@E %
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publicvoid save(finalObject entity){ )cqDvH
getHibernateTemplate().save(entity); 2]aZe4H.
} x+y!P
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publicvoid persist(finalObject entity){ }8F$&
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getHibernateTemplate().save(entity); .4C[D{4
} PUjoi@]
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publicvoid update(finalObject entity){ ]pR fY9w
getHibernateTemplate().update(entity); E?gu(\an@
} 'W?v.W &
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publicvoid delete(finalObject entity){ [[0bhmG)
getHibernateTemplate().delete(entity); ZG/8 Ds
} ]%<Q:+38
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publicObject load(finalClass entity, =Kt9,d08x
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finalSerializable id){ Ns!3- Y
return getHibernateTemplate().load m,gy9$
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(entity, id); yg+IkQDf4U
} {~p7*j^0
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publicObject get(finalClass entity, cR=94i=t
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finalSerializable id){ NrJ_6sjF0g
return getHibernateTemplate().get 1ntkM?
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(entity, id); L;--d`[
} }6CXJ+-UR
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publicList findAll(finalClass entity){ i2FD1*=/?
return getHibernateTemplate().find("from q1TW?\pjb:
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" + entity.getName()); .mT#%ex
} txml*/zL
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publicList findByNamedQuery(finalString 5@UC c
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namedQuery){ Cl t5
return getHibernateTemplate ,jbGM&.C
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().findByNamedQuery(namedQuery); 6@?aVM~
} ovDJ{3L6O
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publicList findByNamedQuery(finalString query, &>W (l.
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finalObject parameter){ xMNNXPz(
return getHibernateTemplate xI@$aTGq
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().findByNamedQuery(query, parameter); (aJP: ^
} YA"Ti9-EV
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publicList findByNamedQuery(finalString query, 5PGlR!^
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finalObject[] parameters){ b.R!2]T]i^
return getHibernateTemplate SLdN.4idK
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().findByNamedQuery(query, parameters); h6\3vfj^f
} <'}b*wUB
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publicList find(finalString query){ v@fe-T&0
return getHibernateTemplate().find $(@o$%d
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(query); Q%& _On
} @e!Zc3
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publicList find(finalString query, finalObject Sa;<B:|
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parameter){ @K$VV^wp
return getHibernateTemplate().find UCn*UX
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(query, parameter); Ew
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} %XP_\lu]
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public PaginationSupport findPageByCriteria GJ1;\:cQq
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(final DetachedCriteria detachedCriteria){ KE/-VjZu
return findPageByCriteria ?$|uT
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); gDQkn {T.%
} .D8~)ZWN
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public PaginationSupport findPageByCriteria 1R=)17'O
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(final DetachedCriteria detachedCriteria, finalint PIZ
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startIndex){ M}Nb|V09
return findPageByCriteria $!YKZ0)B'0
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(detachedCriteria, PaginationSupport.PAGESIZE, 7FmbV/&c
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startIndex); iNod</+"K
} .FIt.XPzv
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public PaginationSupport findPageByCriteria op hH9D
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(final DetachedCriteria detachedCriteria, finalint =X-^YG3x
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pageSize, \Fj5v$J-
finalint startIndex){ -VS9`7k
return(PaginationSupport) C#MFpT
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getHibernateTemplate().execute(new HibernateCallback(){ Vbg10pV0
publicObject doInHibernate }3v'Cp0L
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(Session session)throws HibernateException { zRwb"
Criteria criteria = `]*%:NZP@
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detachedCriteria.getExecutableCriteria(session); H>60D|v[
int totalCount = {S[I_\3
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((Integer) criteria.setProjection(Projections.rowCount p"Ot5!F>
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()).uniqueResult()).intValue(); $.H:8^W
criteria.setProjection $/u1chf
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(null); SArfczoB
List items = G1]"s@8(
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criteria.setFirstResult(startIndex).setMaxResults kTnOmAw
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(pageSize).list(); s K+
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PaginationSupport ps = *_`76`cz%X
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new PaginationSupport(items, totalCount, pageSize, nD7|8,'
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startIndex); bf& }8I$
return ps; _p\629`
} &!ED# gs
}, true); ?2{bKIV_
} _|N}4a
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public List findAllByCriteria(final o4$Ott%Wm
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DetachedCriteria detachedCriteria){ ac9qj
return(List) getHibernateTemplate AgIazv1
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().execute(new HibernateCallback(){ 4|`Yz%'
publicObject doInHibernate )h#]iGVN}
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(Session session)throws HibernateException { puOC60zI
Criteria criteria = K*~]fy
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detachedCriteria.getExecutableCriteria(session); n5|l|#c$N
return criteria.list(); COR;e`%,
} `>s7M.|X
}, true); M :V2a<!c
} -K"4rz
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public int getCountByCriteria(final c! @F
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DetachedCriteria detachedCriteria){ zbNA\.y
Integer count = (Integer) dm6~
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getHibernateTemplate().execute(new HibernateCallback(){ Frk c O
publicObject doInHibernate F!JJ6d53y
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(Session session)throws HibernateException { 7|YN:7iA
Criteria criteria = J1bA2+5.*e
$(ewk):
detachedCriteria.getExecutableCriteria(session); ^(ScgoXva
return 0n.S,3|
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criteria.setProjection(Projections.rowCount QdQd(4/1
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()).uniqueResult(); ` @8`qXg
} XAPYpBgm
}, true); Ur^j$B}
return count.intValue(); @9Q2$
} 'B_\TU0
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} p,F^0OU2}:
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用户在web层构造查询条件detachedCriteria,和可选的 Zk&h:c
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Jic}+X*0
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PaginationSupport的实例ps。 G/vC~6x
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ps.getItems()得到已分页好的结果集 6 "U8V?E
ps.getIndexes()得到分页索引的数组 -I":Z2.fR
ps.getTotalCount()得到总结果数 C9qJP^F
ps.getStartIndex()当前分页索引 3NIUW!gr
ps.getNextIndex()下一页索引 +R6a}d/K
ps.getPreviousIndex()上一页索引 n-o3
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 >`'O7.R
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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 <*|?x86~
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一下代码重构了。 WZZ4]cC
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我把原本我的做法也提供出来供大家讨论吧: ~9=aT1S|
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首先,为了实现分页查询,我封装了一个Page类: ]XeO0Y
java代码: C5W>W4EM
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/*Created on 2005-4-14*/ 5\Fz!
package org.flyware.util.page; {_#y z\j
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/** YE}s
* @author Joa @]HXP_lyD/
* w!SkWS b,~
*/ l&$$w!n0w
publicclass Page { T[?6[,.
8' K0L(3[
/** imply if the page has previous page */ ;n6b%,s
privateboolean hasPrePage; -x`G2i
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/** imply if the page has next page */ xd-XWXc
privateboolean hasNextPage; !}KqB8;
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/** the number of every page */ 2+o|A
privateint everyPage; &|Pu-A"5~
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/** the total page number */ k(%QIJH
privateint totalPage; q
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/** the number of current page */ !@A#=(4R4
privateint currentPage; fP HLXg5s
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/** the begin index of the records by the current CHJ>{b`O
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query */ PX(pX>
privateint beginIndex; 8|Y.|\
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/** The default constructor */ J#2!ZQE
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public Page(){ BxK^?b[E8
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} Q@@v1G\
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/** construct the page by everyPage up'
* @param everyPage $ (=~r`O+1
* */ }!>=|1fY
public Page(int everyPage){ 5S{7En~zUE
this.everyPage = everyPage; o>/O++7R a
} c`*TPqw(B[
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/** The whole constructor */ -fI@])$9J
public Page(boolean hasPrePage, boolean hasNextPage, j2l55@
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int everyPage, int totalPage, e`>{$t
int currentPage, int beginIndex){ z*$q8Z&7rg
this.hasPrePage = hasPrePage; Mg,:UC:
this.hasNextPage = hasNextPage; +;}#B~:
this.everyPage = everyPage; L I >(RMv
this.totalPage = totalPage; )~6zYJ2
this.currentPage = currentPage; {nT^tAha
this.beginIndex = beginIndex; J?UQJ&!@O
} )6KMHG
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/** s@hRqGd:
* @return D}C,{ ~c)~015`
this.currentPage = currentPage; ^<e@uNGg
} mC?i}+4>4R
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/** &[NG]V!Oc
* @return 8t@p@Td|
* Returns the everyPage. "H-"
*/ kg@>;(V&
publicint getEveryPage(){ }g# &