Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 SQ@@79A
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 PS>k67sI
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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 b*$^8%
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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 419t"1b
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分页支持类: `A#r6+
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java代码: oYu5]ry
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package com.javaeye.common.util; ^K3{6}]
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import java.util.List; z*:^*,
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publicclass PaginationSupport { tL D.e
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publicfinalstaticint PAGESIZE = 30; 2Ddrxc>48
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privateint pageSize = PAGESIZE; X_XqT
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privateList items; k)4
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privateint totalCount; $AoN,B>
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privateint[] indexes = newint[0]; % nJ'r?+h
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privateint startIndex = 0; GMFp,Df
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public PaginationSupport(List items, int Rf7py )
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totalCount){ -BR&b2
setPageSize(PAGESIZE); Ucv-}oa-?
setTotalCount(totalCount); MSw/_{
setItems(items); aVd{XVE
setStartIndex(0); ;gf^;%FK
} w+PbT6;
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public PaginationSupport(List items, int --y.q~d
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totalCount, int startIndex){ P*G&pitT
setPageSize(PAGESIZE); >pr{)bp G
setTotalCount(totalCount); xEGI'lt
setItems(items); w<5w?nP+Oh
setStartIndex(startIndex); 7|\[ipVX:3
} U1dz:OG>
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public PaginationSupport(List items, int aiea&aJ
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totalCount, int pageSize, int startIndex){ !DD|dVA{
setPageSize(pageSize); B\9ymhx;g%
setTotalCount(totalCount); ?mnwD ]u
setItems(items); xj(&EGY:
setStartIndex(startIndex); \#
} ?$9C[Kw`
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publicList getItems(){ Z{&PKS
return items; %
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} J7$5<
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publicvoid setItems(List items){ Es1Yx\/:
this.items = items; }wz )"
} WC0@g5;1[
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publicint getPageSize(){ pz~AsF
return pageSize; )N<>L/R
} g;Bq#/w
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publicvoid setPageSize(int pageSize){ 9w (QM-u
this.pageSize = pageSize; &H<-joZ)Z\
} ewD61Y8-
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publicint getTotalCount(){ FX 0^I 0
return totalCount;
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} (yn!~El3
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publicvoid setTotalCount(int totalCount){ IKH#[jW'IB
if(totalCount > 0){ |v:8^C7
this.totalCount = totalCount; d'J))-*#UO
int count = totalCount / d2Bn`VI
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pageSize; ="z\
if(totalCount % pageSize > 0) f?[IwA`
count++; b2duC
indexes = newint[count]; e%o6s+"
for(int i = 0; i < count; i++){ >DpnIWn
indexes = pageSize * rQ
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} bo`w(h_
}else{ Fn yA;,*
this.totalCount = 0; ^3 F[^#"
} 0l!@bj
} rer=o S
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publicint[] getIndexes(){ y;3vr1?
return indexes; S2w|\"
} G/bWn@
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publicvoid setIndexes(int[] indexes){ JO1KkIV
this.indexes = indexes; :TxfkicN\
} M8Q-x-7
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publicint getStartIndex(){ z{7&= $
return startIndex; T1LtO O
} [89#8|+
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publicvoid setStartIndex(int startIndex){ ^D
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if(totalCount <= 0) It!PP1$
this.startIndex = 0; ehoDWO]S
elseif(startIndex >= totalCount) ej]^VS7w[r
this.startIndex = indexes 8yF15['
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[indexes.length - 1]; t=d~\_Oa
elseif(startIndex < 0) h)~KD%
this.startIndex = 0; rc<^6HqD
else{ j_H{_Ug
this.startIndex = indexes { %vX/Ek
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[startIndex / pageSize]; pJ ;J>7Gt
} K, WNM S
} uI}S9
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publicint getNextIndex(){ (dLt$<F
int nextIndex = getStartIndex() + QS4sSua
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pageSize; 'p80X^g
if(nextIndex >= totalCount) 7%c9 nY
return getStartIndex(); \f}S Hh
else &HNJ'
return nextIndex; wWKC.N
} ><mZOTn e;
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publicint getPreviousIndex(){ be |k"s|6)
int previousIndex = getStartIndex() - nw+L _b
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pageSize; |CexP^;!U
if(previousIndex < 0) 5wmH3g#0
return0; S#8wnHq
else YR@@:n'TP
return previousIndex; 1Thr74M
} ;EP 7q[
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} s/Fc7V!;
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抽象业务类 KwndY,QD
java代码: gYn1-/Z>I
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/** r :{2}nE
* Created on 2005-7-12 9x0B9&
*/ (\{9W
package com.javaeye.common.business; dQVV0)z
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import java.io.Serializable; )mz [2Sfg
import java.util.List; d kHcG&)
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import org.hibernate.Criteria; 16 _HO%v->
import org.hibernate.HibernateException; v`A^6)U#M
import org.hibernate.Session; @s}I_@
import org.hibernate.criterion.DetachedCriteria; OB)Vk
import org.hibernate.criterion.Projections; S7N3L."
import ,%w_E[2
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org.springframework.orm.hibernate3.HibernateCallback; OkGg4X|9
import 8 k9(iS
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org.springframework.orm.hibernate3.support.HibernateDaoS M=HW2xn
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upport; DmEmv/N=
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import com.javaeye.common.util.PaginationSupport; s-Q-1lKV,
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public abstract class AbstractManager extends ,> A9OTSN\
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HibernateDaoSupport { ]:(>r&'
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privateboolean cacheQueries = false; sesr`,m.,
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privateString queryCacheRegion; :{pvA;f
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publicvoid setCacheQueries(boolean _v{,vLH
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cacheQueries){ 0N$tSTo.-<
this.cacheQueries = cacheQueries; &Y%Kr`.h
} mq`N&ABO!K
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publicvoid setQueryCacheRegion(String M` Jj!
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queryCacheRegion){ ge)g ?IP4
this.queryCacheRegion = -l8n0P1+
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queryCacheRegion; {(]B{n
} &&4av*\I
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publicvoid save(finalObject entity){ Ap9CQ h=!
getHibernateTemplate().save(entity); B;XFPQ#b
} 4j|]=58
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publicvoid persist(finalObject entity){ EgM.wQHR]
getHibernateTemplate().save(entity); E@^`B9;Q7
} yx"xbCc#
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publicvoid update(finalObject entity){ 5|f[evQj<S
getHibernateTemplate().update(entity); 7r 07N'
} ?6+GE_VZ
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publicvoid delete(finalObject entity){ sJg-FVe2
getHibernateTemplate().delete(entity); } R!-*Wk
} 8fFURk
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publicObject load(finalClass entity, /s.sW l
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finalSerializable id){ y;<^[
return getHibernateTemplate().load XmXp0b7
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(entity, id); !31v@v:)
} H>AQlO+ J
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publicObject get(finalClass entity, hu%rp{m^,
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finalSerializable id){ jG)fM?
return getHibernateTemplate().get _;3xG0+
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(entity, id); &MsnQP
} V^B'T]s
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publicList findAll(finalClass entity){ L$6{{Tw"2
return getHibernateTemplate().find("from :$."x
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" + entity.getName()); yz8ZY,9
} eyBLgJt8P
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publicList findByNamedQuery(finalString vS%o>"P
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namedQuery){ 4]0|fi3}>
return getHibernateTemplate 5jD2%"YUV
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().findByNamedQuery(namedQuery); fQRGz\r*k
} XSC._)ztEE
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publicList findByNamedQuery(finalString query, (|L0s)
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finalObject parameter){ ]u
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return getHibernateTemplate [R*UPa
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().findByNamedQuery(query, parameter); {rQ6IV3=
} #]<j.Fc`
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publicList findByNamedQuery(finalString query, ax0RtqtR&
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finalObject[] parameters){ ^_
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return getHibernateTemplate &+;z`A'|8
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().findByNamedQuery(query, parameters); <gRv7 ?V[z
} ^55#!/9
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publicList find(finalString query){ +#7e?B
return getHibernateTemplate().find 3<sYxA\?w
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(query); pe$"
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} 8sjAr.iT.
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publicList find(finalString query, finalObject Q$Qs$
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parameter){ !4TM gM
return getHibernateTemplate().find Lb;:<
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(query, parameter); 4%>iIPXi.(
} d6,SZ*AE
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public PaginationSupport findPageByCriteria *-"DZ
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(final DetachedCriteria detachedCriteria){ 0)n#$d>
return findPageByCriteria Tl"GOpH\]
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ,pL%,>R5
} >5-z"f
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public PaginationSupport findPageByCriteria It>8XKS
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(final DetachedCriteria detachedCriteria, finalint FJJ+*3(
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startIndex){ 0V6gNEAUg
return findPageByCriteria 3p`*'j 2R
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(detachedCriteria, PaginationSupport.PAGESIZE, s{x{/Bp(KK
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startIndex); TY}9;QL:
} 'k[d&sR
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public PaginationSupport findPageByCriteria +I1>;
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(final DetachedCriteria detachedCriteria, finalint >8h14uCk
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pageSize, 9NX f~-V-
finalint startIndex){ |35"V3bs
return(PaginationSupport) aoj6/
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getHibernateTemplate().execute(new HibernateCallback(){ 1}nrVn[B9
publicObject doInHibernate ~k>H4hV3
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(Session session)throws HibernateException { KqC8ozup
Criteria criteria = '|
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detachedCriteria.getExecutableCriteria(session); _Bh-*e2k
int totalCount = Za,rht
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((Integer) criteria.setProjection(Projections.rowCount a{*r^m'N
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()).uniqueResult()).intValue(); g2Pa-}{
criteria.setProjection NvCq5B$C
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(null); <j
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List items = <NRW^#g<x
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criteria.setFirstResult(startIndex).setMaxResults 'MZX"t
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(pageSize).list(); aVTTpMY
PaginationSupport ps = ~2 aR>R_nT
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new PaginationSupport(items, totalCount, pageSize, b
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startIndex); 6aC'\8{h
return ps; s*%pNE U
} h\C" ti2
}, true);
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} kB~KC-&O
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public List findAllByCriteria(final e<F>u#d
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DetachedCriteria detachedCriteria){ v&}+ps_W
return(List) getHibernateTemplate ,au-g)IFZ
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().execute(new HibernateCallback(){ c*F'x-TH
publicObject doInHibernate 6,Aj5jG
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(Session session)throws HibernateException { $TU)O^c
Criteria criteria = ,c3gW2E
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detachedCriteria.getExecutableCriteria(session); D9.H<.|36
return criteria.list(); x@^Kd*fo
} OJX* :Q
}, true); "h.-qQGU%
} B,rpc\_
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public int getCountByCriteria(final `*?8<Vm
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DetachedCriteria detachedCriteria){ W>jgsR79M
Integer count = (Integer) ::'DWD1
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getHibernateTemplate().execute(new HibernateCallback(){ N0U6N< w
publicObject doInHibernate T\}?
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(Session session)throws HibernateException { c;RB!`9"
Criteria criteria = &dA{ <.
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detachedCriteria.getExecutableCriteria(session); kl4u]MyL#
return r7dvj#^
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criteria.setProjection(Projections.rowCount T2Duz,
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()).uniqueResult(); uLr9*nxd
} <\0+*`">g
}, true);
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return count.intValue(); X0G
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} fK-tvP0}*
} "v%|&@
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用户在web层构造查询条件detachedCriteria,和可选的 Xgq-r $O2X
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 2y_R05O0
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PaginationSupport的实例ps。 >$^v@jf
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ps.getItems()得到已分页好的结果集 e G8Zn<:s
ps.getIndexes()得到分页索引的数组
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ps.getTotalCount()得到总结果数 P1\:hh
ps.getStartIndex()当前分页索引 +Ndo$|XCy]
ps.getNextIndex()下一页索引 8Xo`S<8VS
ps.getPreviousIndex()上一页索引 1w30Vj2<
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 hu=b,
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 .tFMa:
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一下代码重构了。 R9dC$Y]\M
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我把原本我的做法也提供出来供大家讨论吧: zYL</!6a[
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首先,为了实现分页查询,我封装了一个Page类: |Wo_5|E
java代码: C}})dL;(
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/*Created on 2005-4-14*/ ~\0uy3%
package org.flyware.util.page; T*m;G(
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/** ,F4_ps?(
* @author Joa qa|"kRCO
* VW,"
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*/ 7mUpn:U
publicclass Page { R78=im7
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/** imply if the page has previous page */
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privateboolean hasPrePage; i2h,=NHJh?
{{3n">s}:
/** imply if the page has next page */ fJjtrvNy)
privateboolean hasNextPage; ow,4'f!d
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/** the number of every page */ !i"Z
privateint everyPage; pONBF3H8
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/** the total page number */ z3 zN^ZT
privateint totalPage; WJB/X"J
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/** the number of current page */ #7wOr78
privateint currentPage; #fF~6wopV
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/** the begin index of the records by the current uTSTBI4t
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query */ <%@S-+D`]
privateint beginIndex; ~-1!?t/%
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/** The default constructor */ kX\\t.nH
public Page(){ jl!rCOLt4
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} ?2;gmZd7
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/** construct the page by everyPage upD2vtU
* @param everyPage ;k<n}shD
* */ Hg~O0p}[
public Page(int everyPage){ }w,^]fC:
this.everyPage = everyPage; .6@qU}
} qTGEi
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/** The whole constructor */ zsQhydTR
public Page(boolean hasPrePage, boolean hasNextPage, 7DG{|%\HF
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int everyPage, int totalPage, wEMh !jAbv
int currentPage, int beginIndex){ dHE\+{K%-
this.hasPrePage = hasPrePage; LuLnmnmB
this.hasNextPage = hasNextPage; g?(h{r`
this.everyPage = everyPage; OZHQnvZ
this.totalPage = totalPage; ws{2 0
this.currentPage = currentPage; L(a){<c
this.beginIndex = beginIndex; K#O8P+n5[
} 0K0[mC}ZwM
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/** ~|LlT^C
* @return |_=o0lf
* Returns the beginIndex. q- U/JC
*/ (#4
publicint getBeginIndex(){ ac/=%om8u
return beginIndex; "R"7'sJMI
} S\qYw(G
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/** qkCj33v
* @param beginIndex Rf&~7h'+
* The beginIndex to set. U~,~ GU=X
*/ ypoJ4EZ(
publicvoid setBeginIndex(int beginIndex){ ,]OL[m
this.beginIndex = beginIndex; dy4!
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} AWp{n
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/** n1X.]|6'
* @return QQ+? J~
* Returns the currentPage. |j[=uS
*/ ^,Paih
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publicint getCurrentPage(){ Y#'?3
return currentPage; lP4A?J+Q
} sCX 8
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/** |@}Yady@C
* @param currentPage Ha U6`IP
* The currentPage to set. :RJ=f
*/ 5`$.GV
publicvoid setCurrentPage(int currentPage){ H#/}FoBiS
this.currentPage = currentPage; +1 K9R\
} $"+ahS<?tC
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/** SA5
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* @return De^GWO.?bT
* Returns the everyPage. U!GG8;4
*/ O23dtH
publicint getEveryPage(){ e}Y|'bG
return everyPage; vm3B>ACJ
} <i~MBy.
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/** |.A#wjF9
* @param everyPage qusX]Tstz
* The everyPage to set. 3Mvm'T:[
*/ E~=`Ac,G2
publicvoid setEveryPage(int everyPage){ hFDY2Cp]D
this.everyPage = everyPage; $'SWH+G
} $6BD6\@
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/** Gw"H#9J}
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* @return ,ux?wa+
* Returns the hasNextPage. rKlu+/G
*/ 4M)
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publicboolean getHasNextPage(){ 9-<EeV_/
return hasNextPage; }Q 7~tu
} &cty&(2p
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/** AE:IXP|c
* @param hasNextPage 'USol<
* The hasNextPage to set. hOI|#(-
*/ &