Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 X23TS`
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 Q~]R#S
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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 uM\~*@
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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 XJQ[aU"[]N
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分页支持类: [A3hrSw
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java代码: 0zEn`rq&
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package com.javaeye.common.util; nyMA%9,B
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import java.util.List; YsTfv1~z#
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publicclass PaginationSupport { VRxBi!d
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publicfinalstaticint PAGESIZE = 30; #ucOjdquq
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privateint pageSize = PAGESIZE; ufm#H#n)#X
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privateList items; \V&ly/\
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privateint totalCount; K_My4>~Il
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privateint[] indexes = newint[0]; (K2 p3M^
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privateint startIndex = 0; A5nu`e9&
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public PaginationSupport(List items, int Nl(Aa5:!
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totalCount){ ^%_LA't'R
setPageSize(PAGESIZE); bhg"<I
setTotalCount(totalCount); K&S~IFy
setItems(items); paF2{C)4
setStartIndex(0); EKDv3aFQZ#
} [,fMh $t
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public PaginationSupport(List items, int V6Q[Y>84~a
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totalCount, int startIndex){ NcPzmW{#;g
setPageSize(PAGESIZE); O,DA{> *m
setTotalCount(totalCount); O[8Lp?
setItems(items); >w
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setStartIndex(startIndex); [OMKk#vW
} (apAUIE
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public PaginationSupport(List items, int #$#{QEh0}
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totalCount, int pageSize, int startIndex){ txliZ|.O
setPageSize(pageSize); P+]39p{
setTotalCount(totalCount); wCkkfTO
setItems(items); xo?f90+(
setStartIndex(startIndex); []u!piW
} E]+W^VG
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publicList getItems(){ 6KV&E8Gn
return items; ?Bk"3{hl
} m-;u]X=a
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publicvoid setItems(List items){ o6svSS
this.items = items; ww[STg
} -
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publicint getPageSize(){ B9+oI cO
return pageSize; "IB)=Hc
} T 0Y=gn
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publicvoid setPageSize(int pageSize){ lK}F>6^\
this.pageSize = pageSize; O@Xl_QNxc!
} Oq|pd7fcgm
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publicint getTotalCount(){ '9i:b]Hru
return totalCount; e}aD<EG
} #XNe4#
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publicvoid setTotalCount(int totalCount){ pNE!waR>
if(totalCount > 0){ o#E
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this.totalCount = totalCount; MYjDO>(_
int count = totalCount / Cm>8r5LG
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pageSize; )|\72Z~eq
if(totalCount % pageSize > 0) G+}|gG8
count++; K2)),_,@5+
indexes = newint[count]; >WG$!o +R
for(int i = 0; i < count; i++){ QNn$`Qz.
indexes = pageSize * 5a-8/.}cP
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i; Y#C=ku
} jr'O4bo%
}else{ HOXqIZN85
this.totalCount = 0; 7nfQ=?XNK
} @;Yb6&I;
} 5(TI2,4
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publicint[] getIndexes(){ ~(G]-__B<
return indexes; Pxy(YMv
} f`H}Y!W(
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publicvoid setIndexes(int[] indexes){ LV'v7 2yUH
this.indexes = indexes; [WC-EDO2lb
} 4*d_2:|u
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publicint getStartIndex(){ rOH8W
return startIndex; L@0DT&5
} L 'H1\'
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publicvoid setStartIndex(int startIndex){ 2"JIlS;J}7
if(totalCount <= 0) 3v5]L3
this.startIndex = 0; P g7W:L7
elseif(startIndex >= totalCount) pOGVD
this.startIndex = indexes Ku 56TH!Py
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[indexes.length - 1];
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elseif(startIndex < 0) NuW9.6$Jrf
this.startIndex = 0; ?Tt/,Hl?D
else{ 4|7L26,]5
this.startIndex = indexes (\,mA-%E
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[startIndex / pageSize]; nEyPNm)
} l,-smK69
} a{el1_DIGK
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publicint getNextIndex(){ noGMfZ1
int nextIndex = getStartIndex() + Fu!:8Wp!(
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pageSize; x(}@se
if(nextIndex >= totalCount) VqbMFr<k
return getStartIndex(); 9F ).i
else X
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return nextIndex; "f3, w
} UFC.!t-Z
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publicint getPreviousIndex(){ Td
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int previousIndex = getStartIndex() - -GH#nF3G
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pageSize; _OHz 6ag
if(previousIndex < 0) (;V]3CtU*
return0; Kx ?}%@b
else HC+(FymV
return previousIndex; %pe7[/
} ,K8PumM_
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} ,R3D
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抽象业务类 OBF5Tl4
java代码: M@
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/** ~KHp~Xs`
* Created on 2005-7-12 ) l0=jb
*/ QJvA
package com.javaeye.common.business; {6a";Xj\e
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import java.io.Serializable; b?h"a<7
import java.util.List; Xp4pN{h e
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import org.hibernate.Criteria; cQS}pQyYN
import org.hibernate.HibernateException; f\2'/g}6a
import org.hibernate.Session; 3#^xxEu
import org.hibernate.criterion.DetachedCriteria; %(,JBa:G
import org.hibernate.criterion.Projections; \
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import OAc+LdT
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org.springframework.orm.hibernate3.HibernateCallback; H [R|U
import ERCW5b[RT
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org.springframework.orm.hibernate3.support.HibernateDaoS coyy T
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upport; {CYFM[V
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import com.javaeye.common.util.PaginationSupport; X<vv:
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public abstract class AbstractManager extends Z
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HibernateDaoSupport { [;83
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privateboolean cacheQueries = false; 'HH[[9Q
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privateString queryCacheRegion; [8l8m6
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publicvoid setCacheQueries(boolean 118A6qyi
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cacheQueries){ <;=?~QK%-
this.cacheQueries = cacheQueries; Jx.Jx~
} B24wn8<
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publicvoid setQueryCacheRegion(String gcQ>:mi
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queryCacheRegion){ q~T*R<S
this.queryCacheRegion = Kn?>XXAc
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queryCacheRegion; F$^RM3
} +%UfnbZ
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publicvoid save(finalObject entity){ p?>(y
getHibernateTemplate().save(entity); v8I&~_b
} hV)D,oN3
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publicvoid persist(finalObject entity){ 4%Z! *W*
getHibernateTemplate().save(entity); .!/DM-C
} 8Mf6*G#Y
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publicvoid update(finalObject entity){ |k\4\aLj
getHibernateTemplate().update(entity); }~DlOvsq
} bC{}&a
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publicvoid delete(finalObject entity){ lA<n}N)j
getHibernateTemplate().delete(entity); lmi,P-Q
} MzM"r"u
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publicObject load(finalClass entity, ~! ;*C
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finalSerializable id){ ^~9fQJNs
return getHibernateTemplate().load %UT5KYd!=N
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(entity, id); &kUEnwQ-
} ~_8Dv<"a
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publicObject get(finalClass entity, X'Q?Mh
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finalSerializable id){
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return getHibernateTemplate().get uatY:GSR
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(entity, id); DB%}@IW"
} tg-U x
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publicList findAll(finalClass entity){ >M~1{
return getHibernateTemplate().find("from \kWL:uU
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" + entity.getName()); 1Xzgm0OS;
} @n2Dt d
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publicList findByNamedQuery(finalString ~&HP}Q$#f
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namedQuery){ ^Gi9&fS,
return getHibernateTemplate )|3BS`
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().findByNamedQuery(namedQuery); <<'%2q5
} m.F}9HI%hN
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publicList findByNamedQuery(finalString query, Z9wKjxu+
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finalObject parameter){ (A(j.[4a
return getHibernateTemplate yz}ik^T
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().findByNamedQuery(query, parameter); f$>KTb({B
} 4y*"w*L
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publicList findByNamedQuery(finalString query, ='A VI-go5
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finalObject[] parameters){ !$u:[T_8
return getHibernateTemplate 8k{KnH
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().findByNamedQuery(query, parameters); h;Hg/jv
} joz0D!-"#
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publicList find(finalString query){ o5B]? ekpq
return getHibernateTemplate().find gmqA 5W~y
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(query); r01u3!
} t|urvoz
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publicList find(finalString query, finalObject .oS[ DTn5S
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parameter){ +~K)
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return getHibernateTemplate().find uc{s\_
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(query, parameter); :F8h}\a*
} tWyl&,3?1
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public PaginationSupport findPageByCriteria M
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(final DetachedCriteria detachedCriteria){ ::p%R@?
return findPageByCriteria Or#KF6+ut
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); =pZ$oTR
} C2CR#b=)i
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public PaginationSupport findPageByCriteria j.!5&^;u4
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(final DetachedCriteria detachedCriteria, finalint XRmE
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startIndex){ C#V_Gb
return findPageByCriteria 4T6: C?V
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(detachedCriteria, PaginationSupport.PAGESIZE, =Fc}T%
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startIndex); l)e6*sDZ,
} ~Ede5Vg!!2
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public PaginationSupport findPageByCriteria GkxQEL
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(final DetachedCriteria detachedCriteria, finalint ]s0GAp"
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pageSize, bXvriQ.UH
finalint startIndex){ Es- =0gpK
return(PaginationSupport) k]A=Q
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getHibernateTemplate().execute(new HibernateCallback(){
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publicObject doInHibernate 7^V`B^Vu
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(Session session)throws HibernateException { ex#-,;T
Criteria criteria = D^xg2D
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detachedCriteria.getExecutableCriteria(session); 9@?|rje9
int totalCount =
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((Integer) criteria.setProjection(Projections.rowCount xi=0kO
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()).uniqueResult()).intValue(); {H>Tv,v|
criteria.setProjection <>( v~a]
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(null); ~;-2eKw
List items = o6RT 4`
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criteria.setFirstResult(startIndex).setMaxResults x?]fHin_
?&!!(dWFH
(pageSize).list(); W9{;HGWS
PaginationSupport ps = c(29JZ
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new PaginationSupport(items, totalCount, pageSize, dKP| TRd
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startIndex); _dECAk
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return ps; (#x&Y#5
} vXZP>
}, true); ?)[=>Kp
} C?MKbD=K
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public List findAllByCriteria(final FjI1'Ah\
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DetachedCriteria detachedCriteria){ \rT>&o .i
return(List) getHibernateTemplate tR4+]K
)Jw$&%/{1
().execute(new HibernateCallback(){ asE.!g?
publicObject doInHibernate
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}A[5\V^D*
(Session session)throws HibernateException { RQu[FZT,
Criteria criteria = !s !el;G
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detachedCriteria.getExecutableCriteria(session); kpy)kS
return criteria.list(); FW)~e*@8=
} ++ 5!8Nv
}, true); n<@C'\j@
} Bk@EQdn
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public int getCountByCriteria(final D(Q]ddUi'
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DetachedCriteria detachedCriteria){ ynf!1!4
Integer count = (Integer) Eg2SC? 5
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getHibernateTemplate().execute(new HibernateCallback(){ ZN&9qw*
publicObject doInHibernate _ /Eg_dQ~@
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(Session session)throws HibernateException { d/ @P;YN!
Criteria criteria = -i_XP]b&
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detachedCriteria.getExecutableCriteria(session); ;?TM_%>
return /%F,
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criteria.setProjection(Projections.rowCount s;[=B
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()).uniqueResult(); +tG'
} 7j(gW
}, true); MX+gc$Y
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return count.intValue(); B5R 7geC
} Bt1v7M
} ~zvZK]JoX
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用户在web层构造查询条件detachedCriteria,和可选的 KFaYn
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Zw<<p|{)<
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PaginationSupport的实例ps。 [o7Qr?RN
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ps.getItems()得到已分页好的结果集 }}"|(2I
ps.getIndexes()得到分页索引的数组 (B?ZUXM,
ps.getTotalCount()得到总结果数 :KGPQ@:O
ps.getStartIndex()当前分页索引 X+N8r^&
ps.getNextIndex()下一页索引 qd~9uo&[Ig
ps.getPreviousIndex()上一页索引 $U)nrni
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 X/m~^
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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 p9S>H
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一下代码重构了。 ft4hzmuzM
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我把原本我的做法也提供出来供大家讨论吧: 6fCHd10!
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首先,为了实现分页查询,我封装了一个Page类: [ A 7{}
java代码: @18}'k
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/*Created on 2005-4-14*/ 0F
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package org.flyware.util.page; VSh&Y_%
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/** #]Jg>
* @author Joa cIrc@
* POX{;[SV
*/ \5Y<UJKi
publicclass Page { Gi*_ &
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/** imply if the page has previous page */ k~,
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privateboolean hasPrePage; o8NRu7@?
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/** imply if the page has next page */ 6&
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privateboolean hasNextPage; py'xBi6}v
sk
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/** the number of every page */ t J&tNSjTi
privateint everyPage; Jb-.x_Bf
^`Hb7A(
/** the total page number */ Z#YNL-x
privateint totalPage; p+dOw#
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/** the number of current page */ 2.MY8}&WBu
privateint currentPage; z%\&n0
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/** the begin index of the records by the current :+ "H h%
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query */ 4yjIR?
privateint beginIndex; sz%_9;`dpL
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/** The default constructor */ B&6lG!K'?
public Page(){ M}Xf<:g)
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} L0GQH;Y,h
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/** construct the page by everyPage ? Dn}
* @param everyPage TwI'XMO;A
* */ JYv<QsD
public Page(int everyPage){ 1 vtC4`
this.everyPage = everyPage; \O\q1
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} `csZ*$7
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/** The whole constructor */ KSHq0A6/q%
public Page(boolean hasPrePage, boolean hasNextPage, J_.cC
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int everyPage, int totalPage, lW|v_oP9
int currentPage, int beginIndex){ lk[Y6yE
this.hasPrePage = hasPrePage; #qpP37G
this.hasNextPage = hasNextPage;
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this.everyPage = everyPage; z^z`{B
this.totalPage = totalPage; '+27_j
this.currentPage = currentPage; =I@I
this.beginIndex = beginIndex; 4d-(:
} |"I)1[7
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/** Am_>x8z
* @return 9 <{C9
* Returns the beginIndex. rNTLP
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*/ 0bT[05.
publicint getBeginIndex(){ aWJj@',_
return beginIndex;
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} k)|.<
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/** f'H|K+bO
* @param beginIndex v8j3
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* The beginIndex to set. (QJe-)0_y
*/ H;l_;c`
publicvoid setBeginIndex(int beginIndex){ "Y=`w,~~
this.beginIndex = beginIndex; 3RT\G0?8f
} .V?[<}OJn
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/** . R/y`:1:W
* @return aR/?YKA
* Returns the currentPage. =R|XFZ,
*/ T9H*]LxK
publicint getCurrentPage(){ IhYR4?e
return currentPage; fyA-*)oHv
} 9S*"={}%
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/** v|o{AL:ei
* @param currentPage HOF$(86zqA
* The currentPage to set. gJ'pwSA
*/ $?G@ijk,
publicvoid setCurrentPage(int currentPage){ 5;U Iz@BJ
this.currentPage = currentPage; q1( [mHZ
} y~@zfJ5/^
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/** I/MY4?(T
* @return D5D *$IC
* Returns the everyPage. c{BAQZVc
*/ czuIs|_K*
publicint getEveryPage(){ 2!Dz9m3
return everyPage; At4\D+J{Vs
} KBmO i
+*]$PVAFA
/** Qs6Vu)U=
* @param everyPage A51
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* The everyPage to set. Pwl*5/l
*/ 2@<_,'
publicvoid setEveryPage(int everyPage){ =cS&>MT
this.everyPage = everyPage; 8(L$a1#5W
}
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/** `$B?TNuch7
* @return E1eGZ&&Gd
* Returns the hasNextPage. sFTAE1|
*/ I'4(Ibl+
publicboolean getHasNextPage(){ r ;RYGLx
return hasNextPage; c>_ti+
} lFnls6dp
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/** 1;ttwF>G7
* @param hasNextPage ^l!SIu
* The hasNextPage to set. .gx^L=O:
*/ fp' '+R[
publicvoid setHasNextPage(boolean hasNextPage){ .Vbd-jr'M
this.hasNextPage = hasNextPage; y2jv84
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} HAxLYun(3w
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/** .9nqJ7]
* @return !9;m~T7.
* Returns the hasPrePage. &n6{wtBP
*/ -V/y~/]J
publicboolean getHasPrePage(){ msBoInhI
return hasPrePage; 6e-ME3!<l
} =!'9TS
ys9:";X;}
/** 0cS$S Mn{
* @param hasPrePage 7;EDU
* The hasPrePage to set. ;g0Q_F@;p
*/ Y)sB]!hx
publicvoid setHasPrePage(boolean hasPrePage){ 2{79,Js0
this.hasPrePage = hasPrePage; DBAyc#
} 0/R;g~q@
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/** FRQ.ix2
* @return Returns the totalPage. LCorT-
* u7< +)6-
*/ b Hr^_ogN
publicint getTotalPage(){
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return totalPage; 3``JrkPI
} EO !,rB7I
//7YtK6
/** }yT/UlU
* @param totalPage dA)T>
* The totalPage to set. <m-(B"FX
*/ KQfWpHwfj
publicvoid setTotalPage(int totalPage){ v@\S$qU2
this.totalPage = totalPage; )E9!m
} 8_%GH}{
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} 6e ?xu8|
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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 cEL:5*cAU}
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个PageUtil,负责对Page对象进行构造: x1 |/
java代码: kkl'D!z2g
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/*Created on 2005-4-14*/ dj0%?g>
package org.flyware.util.page; pT,8E(*l2
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import org.apache.commons.logging.Log; yY#h1
import org.apache.commons.logging.LogFactory; r?DCR\Jq
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/** ]
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* @author Joa R'gd/.[e
* yr%[IX]R
*/ i]Mem M-
publicclass PageUtil { UBL{3s^"
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privatestaticfinal Log logger = LogFactory.getLog 63E6nW M
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(PageUtil.class); KS*,'hvY
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/** .))g]CH
* Use the origin page to create a new page {F<0e^*
* @param page WaB0?jI
* @param totalRecords XZ%[;[
* @return 336ETrG^0
*/ ,=+t2Bn
publicstatic Page createPage(Page page, int ]$2 yV&V