Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 \k8_ZJw
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 X35hLp8 M
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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 5 Da(DA
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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 \~>#<@h
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分页支持类: R!ij CF\
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java代码: aDESO5
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package com.javaeye.common.util; M9nYt~vHX
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import java.util.List; jLg4_N1SD
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publicclass PaginationSupport { Yy]Henw;
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publicfinalstaticint PAGESIZE = 30; 2vLn#
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privateint pageSize = PAGESIZE; &M0v/!%L
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privateList items; [o6d]i!
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privateint totalCount; |{(ynZ]R
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privateint[] indexes = newint[0]; (J;<&v}Gad
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privateint startIndex = 0; 4T"P#)z
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public PaginationSupport(List items, int (msJ:SG
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totalCount){ Om*Dy}
setPageSize(PAGESIZE); ?p]w_l
setTotalCount(totalCount); (Y86q\DQ?|
setItems(items); AiuF3`Xa
setStartIndex(0); 3-0Y<++W3>
} vnE,}(M
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public PaginationSupport(List items, int *hba>LZ
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totalCount, int startIndex){ _kfApO)O
setPageSize(PAGESIZE); q%l<Hw6{z
setTotalCount(totalCount); b1+Nm
setItems(items); />$kDe
setStartIndex(startIndex); q-H]Hxv
} G|V ^C_:
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public PaginationSupport(List items, int wp$=lU{B
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totalCount, int pageSize, int startIndex){ h4U .wk
setPageSize(pageSize); hM-qC|!
setTotalCount(totalCount); ]GJskBm
setItems(items); MEE]6nU
setStartIndex(startIndex); Mppb34y
} y3vOb , 4
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publicList getItems(){ B; ~T|ex u
return items; z[B7k%}
} YS9| J=!~
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publicvoid setItems(List items){ {"s8X(#_sC
this.items = items; `ainJs:B
} i^yQ;
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publicint getPageSize(){ lw7wvZD
return pageSize;
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} xf |=n
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publicvoid setPageSize(int pageSize){ K/altyj`
this.pageSize = pageSize; H4UnF5G
} + IMP<
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publicint getTotalCount(){ LGK}oL'
return totalCount; xZ .:H&0G
} zk?lNs
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publicvoid setTotalCount(int totalCount){ &iTsuA/7
if(totalCount > 0){ rkVZP!7!
this.totalCount = totalCount; F4*f_lP
int count = totalCount / 9K)2OX;$w
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pageSize; %
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if(totalCount % pageSize > 0) Rzz*[H
count++; Da.v yp
indexes = newint[count];
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for(int i = 0; i < count; i++){ tP`,Egf"g
indexes = pageSize * P
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} "w N
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}else{ !r$/-8b
this.totalCount = 0; oo`mVRVf
} o +&/ N-t
} T2k5\r8
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publicint[] getIndexes(){ 4!D!.t~r
return indexes; a&j
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} g8^ $,
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publicvoid setIndexes(int[] indexes){ k9a-\UIMet
this.indexes = indexes; VEJ Tw
} *T 6<'a
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publicint getStartIndex(){ @A
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return startIndex; R6!t2gdKe@
} M>-x\[n+
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publicvoid setStartIndex(int startIndex){ hD
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if(totalCount <= 0) "zfy_h
this.startIndex = 0; l]GLkE
elseif(startIndex >= totalCount) |ML|P\1&V
this.startIndex = indexes ktnsq&qNL
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[indexes.length - 1]; Rzw}W7zg[
elseif(startIndex < 0) ~|riFp=J
this.startIndex = 0; 0&zp9(G5
else{ ZjbMk3Y
this.startIndex = indexes h%Bp%Y9
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[startIndex / pageSize]; ZfoI7<?33
} F@[l&`7
} [Qr#JJ
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publicint getNextIndex(){ A=>%KQc?
int nextIndex = getStartIndex() + dQTJC
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pageSize; DdPU\ ZWR
if(nextIndex >= totalCount) Lk4gjs,V
return getStartIndex(); pFhznH{0
else whr[rWt@>
return nextIndex; g\GuH?|
} 1#6c
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publicint getPreviousIndex(){ EQ\/I(
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int previousIndex = getStartIndex() - =56O-l7T*w
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pageSize; y@e/G3
if(previousIndex < 0) w_PnEJa9
return0; ^_n(>$
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else B/AS|i] sM
return previousIndex; >,7-cm=.
} ,x&T8o/a
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} [s"xOP9R
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抽象业务类 Igrr"NuDZ
java代码: 2XNO*zbve
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/** wa2?%y_G
* Created on 2005-7-12 !UDTNF?1
*/ :;HJ3V;
package com.javaeye.common.business; t,Ss3
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import java.io.Serializable; A63=$
import java.util.List; !E#FzY!}Pl
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import org.hibernate.Criteria; \2#7B8
import org.hibernate.HibernateException; RR
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import org.hibernate.Session; B 'SLyf
import org.hibernate.criterion.DetachedCriteria; QZw`+KR
import org.hibernate.criterion.Projections; rvouE:
import +XMKRt
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org.springframework.orm.hibernate3.HibernateCallback; 9#cPEbb~
import ,%6!8vX
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org.springframework.orm.hibernate3.support.HibernateDaoS D?A3p6%
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upport; ?g+uJf
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import com.javaeye.common.util.PaginationSupport; Y#7sDd!N|
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public abstract class AbstractManager extends j2^Vz{
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HibernateDaoSupport { b
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privateboolean cacheQueries = false; 2Kwr=t
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privateString queryCacheRegion; *QH~z2:[
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publicvoid setCacheQueries(boolean _D.4=2@|l8
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cacheQueries){ 1K\zamBg
this.cacheQueries = cacheQueries; upi\pXv
} DXyRNE<G[C
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publicvoid setQueryCacheRegion(String '8Wu9 phT
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queryCacheRegion){ x<d2/[(}mT
this.queryCacheRegion = C@b-)In
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queryCacheRegion; %/.yGAPkx
} _O#R,Y2#
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publicvoid save(finalObject entity){ Yc^;?n`x
getHibernateTemplate().save(entity); 6
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} Xnc?oT+
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publicvoid persist(finalObject entity){ c'md)nD2M
getHibernateTemplate().save(entity); H'a6]
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} d
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publicvoid update(finalObject entity){ "*8>` 6 E
getHibernateTemplate().update(entity); Q{=DLm`
} tY@+d*u
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publicvoid delete(finalObject entity){ ;suY
getHibernateTemplate().delete(entity); q8SHFKE
} \$+#7( K
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publicObject load(finalClass entity, /`s{!t#Y
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finalSerializable id){ 5J~@jPU
return getHibernateTemplate().load o#uhPUZ
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(entity, id); jI/#NCKE
} k|4}Do%;
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publicObject get(finalClass entity, yU|=)p5
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finalSerializable id){ O%s7 }bR3
return getHibernateTemplate().get >zX`qv&>
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(entity, id); UX24*0`\~
} d~qZ;uw
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publicList findAll(finalClass entity){ 7<0oK|~c#
return getHibernateTemplate().find("from
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" + entity.getName()); B,b^_4XX$
} c8h71Cr
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publicList findByNamedQuery(finalString +?'a2pUS
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namedQuery){ TUN6`/"
return getHibernateTemplate O[+\` 63F=
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().findByNamedQuery(namedQuery); +!/pzoWpE
} BD2Gv)?g
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publicList findByNamedQuery(finalString query, >)t-Zh:n
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finalObject parameter){ /lLG|aAe
return getHibernateTemplate Z{^Pnit
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().findByNamedQuery(query, parameter); Lvb'qZ6n
} uWLf9D "
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publicList findByNamedQuery(finalString query, $C
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finalObject[] parameters){ KBI36=UV
return getHibernateTemplate NQx>u
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().findByNamedQuery(query, parameters); ZdJQ9y
} "lA8CA
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publicList find(finalString query){ >p29|TFbV
return getHibernateTemplate().find ]#;u]
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(query); w""
} {!*dk
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publicList find(finalString query, finalObject >P}6/L
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parameter){ Yb348kRF
return getHibernateTemplate().find /Py`a1
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(query, parameter); 3oC^"723
} }F-,PSH
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public PaginationSupport findPageByCriteria ]RuH6d2d|
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(final DetachedCriteria detachedCriteria){ b6^#{))"
return findPageByCriteria mr+8[0
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); COL_c<\
} Bgs,6:
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public PaginationSupport findPageByCriteria r12e26_Ab
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(final DetachedCriteria detachedCriteria, finalint ;HmQRiCg
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startIndex){ T#3`&[
return findPageByCriteria `;Xwv)
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(detachedCriteria, PaginationSupport.PAGESIZE, Ym
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startIndex); s x) x7
} tC&jzN"
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public PaginationSupport findPageByCriteria Es&'c1$^s
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(final DetachedCriteria detachedCriteria, finalint Q oWjC
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pageSize, 4EFP*7X
finalint startIndex){ &!?qSi~V
return(PaginationSupport) }4_c~)9Q
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getHibernateTemplate().execute(new HibernateCallback(){ GE#LcCa
publicObject doInHibernate :Oc&{z?q
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(Session session)throws HibernateException { R]y9>5 'U
Criteria criteria = 89fl\18%
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detachedCriteria.getExecutableCriteria(session); 1-}$sO c
int totalCount = r' J3\7N!u
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((Integer) criteria.setProjection(Projections.rowCount An=Q`Uxt/
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()).uniqueResult()).intValue(); @,SN8K0T
criteria.setProjection fj[tm
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(null); A5YS
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List items = <Q?_],ip
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criteria.setFirstResult(startIndex).setMaxResults o[>p
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(pageSize).list(); du^r EMb%
PaginationSupport ps = (Ek=0;Cr
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new PaginationSupport(items, totalCount, pageSize, )}SiM{g
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startIndex); Eq'oy~.oV
return ps; !Nno@SP@
} hP=z<&zb/
}, true); (N$$N:ac[t
} G9jlpf5>
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public List findAllByCriteria(final hionR)R4
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DetachedCriteria detachedCriteria){ Ge4tc
return(List) getHibernateTemplate
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().execute(new HibernateCallback(){
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publicObject doInHibernate "6P- 0CJ
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(Session session)throws HibernateException { }NETiJ"6
Criteria criteria = 8A|i$#.&
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detachedCriteria.getExecutableCriteria(session); ]@7]mu:oL
return criteria.list(); eZ
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} K7$Vl"l
}, true); Ia>>b #h
} me/ae{
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public int getCountByCriteria(final Nx"v|"
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DetachedCriteria detachedCriteria){ 1@A*Jj[R%
Integer count = (Integer) 4r>buEU
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getHibernateTemplate().execute(new HibernateCallback(){ m&Lc."
publicObject doInHibernate kn|z
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(Session session)throws HibernateException { M)!:o/!c S
Criteria criteria = s\i.pd:Q
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detachedCriteria.getExecutableCriteria(session); QTjOLK$e$
return !;YQQ<D
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criteria.setProjection(Projections.rowCount T+|V;nP.
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()).uniqueResult(); ,JmA e6
} Y4dTv<=K@i
}, true); cP MUu9du
return count.intValue(); r.;(Kx/M
} 8yc?9&/|
} zVs|go>F
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用户在web层构造查询条件detachedCriteria,和可选的 "Z6: d"S`
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 $MG. I[h
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PaginationSupport的实例ps。 [{B1~D-
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ps.getItems()得到已分页好的结果集 v`$9;9
ps.getIndexes()得到分页索引的数组 WtTwY8HC
ps.getTotalCount()得到总结果数 P'6(HT>F?
ps.getStartIndex()当前分页索引 !S',V&Yb
ps.getNextIndex()下一页索引 #UH7z 4u
ps.getPreviousIndex()上一页索引 ^ok;<fJ
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 Lay+)S.ta[
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 2JYt.HN
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一下代码重构了。 `$\Y,9E}x
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我把原本我的做法也提供出来供大家讨论吧: $|YIr7?R
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首先,为了实现分页查询,我封装了一个Page类: 8EPV\M1%
java代码: ft[g1
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/*Created on 2005-4-14*/ =`X@+~%-
package org.flyware.util.page; G
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/** pstQithS
* @author Joa SJ-g2aAT
* ^q,KRut
*/ f6Wu+~|Y
publicclass Page { X?.bE!3=
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/** imply if the page has previous page */ '.@R_sj
privateboolean hasPrePage; j]<T\O>t>
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/** imply if the page has next page */ 3Fn26Rij
privateboolean hasNextPage; 7
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/** the number of every page */ K`FgU7g{
privateint everyPage;
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/** the total page number */ morI'6N
privateint totalPage; |pp @
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/** the number of current page */ lq_W;L
privateint currentPage; T}[W')[s
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/** the begin index of the records by the current 2`vCQV
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query */ Md
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privateint beginIndex; G6eC.vU]j
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/** The default constructor */ FV$= l
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public Page(){ tb0XXEE
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} tTyu,%/m
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/** construct the page by everyPage c)SSi@<
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* @param everyPage :*&wnQMKR
* */ im+2)9f
public Page(int everyPage){ _'H<zZo
this.everyPage = everyPage; S53%*7K.
} i&>,aiH@
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/** The whole constructor */ 0 \LkJ*i
public Page(boolean hasPrePage, boolean hasNextPage, =pcj{B{qa
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int everyPage, int totalPage, !nj%n
int currentPage, int beginIndex){ \MtiLaI"
this.hasPrePage = hasPrePage; vo`wYJ3W
this.hasNextPage = hasNextPage; fsjA7)/
this.everyPage = everyPage; d=qpTb;(
this.totalPage = totalPage; yK?~XV:
this.currentPage = currentPage; TKLy38
this.beginIndex = beginIndex; 31>k3IP&
} G>mgoN
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/** m4Wn$Z
* @return L''0`a. +S
* Returns the beginIndex. :
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*/ UWn}0:6t
publicint getBeginIndex(){ i8B%|[nm
return beginIndex; rpEFyHorJ
} +zs6$OI]V
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/** GYO\l.%V5y
* @param beginIndex 7Xad2wXn
* The beginIndex to set. iY|YEi8
*/
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publicvoid setBeginIndex(int beginIndex){ -Ez|
this.beginIndex = beginIndex; f6L_uk`{
} zW0AB8l
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/** INbjk;k
* @return m]-8?B1`Y
* Returns the currentPage. Yn<0D|S;X
*/ U[A*A^$c}
publicint getCurrentPage(){ Ab2g),;c
return currentPage; CY>NU
} rIb[gm)Rk
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/** Ve8!
* @param currentPage ==XP}w)m
* The currentPage to set. 9)l_(*F
*/ y9*H
publicvoid setCurrentPage(int currentPage){ !7xp<=
this.currentPage = currentPage; CMBW]b|
} |Lhz^5/
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/** |~HlNUPR
* @return z}Z`kq+C
* Returns the everyPage. 7lVIN&.=
*/ :x{Q
publicint getEveryPage(){ 68HX,t
return everyPage; {-Y_8@&