Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 g`gH]W
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 zp"sM
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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 %|o4 U0c
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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 sxl29y^*
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分页支持类: ?bQ~+M\
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java代码: =4/lJm``
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package com.javaeye.common.util; sju. `f>-r
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import java.util.List; bKmR
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publicclass PaginationSupport { 6\g]Y
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publicfinalstaticint PAGESIZE = 30; znFa4
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privateint pageSize = PAGESIZE; `*8p T
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privateList items; ed2QGTgR
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privateint totalCount; uOs
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privateint[] indexes = newint[0]; CP'?Om2
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privateint startIndex = 0; E*.D_F
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public PaginationSupport(List items, int zOCru2/
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totalCount){ m/JpYv~
setPageSize(PAGESIZE); EP'2'51
setTotalCount(totalCount); B:a&)Lwp0
setItems(items); %[-D&flKC
setStartIndex(0); Sh*LD
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} /{d7%Et6
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public PaginationSupport(List items, int 8{@|M l
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totalCount, int startIndex){ i(2s"Uww,
setPageSize(PAGESIZE); tqAh&TW3+
setTotalCount(totalCount); X&TTw/J!^
setItems(items); UOZ"#cQ
setStartIndex(startIndex); g,7`emOX
} bwqla43gX
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public PaginationSupport(List items, int xYRN~nr
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totalCount, int pageSize, int startIndex){ X.}:gU-
setPageSize(pageSize); O2us+DhQ
setTotalCount(totalCount); lSUEE0V%Q
setItems(items); ; ob>$ _
setStartIndex(startIndex); *ELbz}Q
} C3u/8Mrt7
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publicList getItems(){ 35?et-=w
return items; s|dcO
}
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publicvoid setItems(List items){ ^0R.'XL
this.items = items; B4r4PSB>!
} :&HrOdz
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publicint getPageSize(){ /w^}(IJ4
return pageSize; p2GkI/6)uu
} =66dxU?}
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publicvoid setPageSize(int pageSize){ 0hnN>?
this.pageSize = pageSize; (q59cA w~X
} Vi?[yu<F
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publicint getTotalCount(){ JZNRMxu
return totalCount; 7$b!-I+a2
} BRPvBs?Q,{
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publicvoid setTotalCount(int totalCount){ -Id4P _y
if(totalCount > 0){ y$Sn3_9 V
this.totalCount = totalCount; mFw`LvH?*
int count = totalCount / $d3al%Uo
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pageSize; -hiG8%l5
if(totalCount % pageSize > 0) SpU+y|\[0
count++; Wl/oun~o
indexes = newint[count]; 7+0Kg'^+n
for(int i = 0; i < count; i++){ c3W9"
indexes = pageSize * y4PR&^l?g
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} vxhs1vh
}else{ 7xTgG!>v
this.totalCount = 0; \
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} brx
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} zc01\M
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publicint[] getIndexes(){ -~\R.<+
return indexes; `w` f[dU-
} C#d.3t
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publicvoid setIndexes(int[] indexes){ VNBf2Va
this.indexes = indexes; %nk]zf..
} tgSl(.
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publicint getStartIndex(){ 1O]'iS"
return startIndex; SR)G!9z_/
} >?aPXC
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publicvoid setStartIndex(int startIndex){ mSF>~D1_
if(totalCount <= 0) Sio^FOTD
this.startIndex = 0; 0tyoH3o/d
elseif(startIndex >= totalCount) z SDRZ!
this.startIndex = indexes v._Q XcE
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[indexes.length - 1]; :,Z'/e0&
elseif(startIndex < 0) >-J%=P
this.startIndex = 0; _;L%? -2c
else{ }Q&zYC]d
this.startIndex = indexes z*n
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[startIndex / pageSize]; (8T36pt~
} sQUJ]h
} 3D32'KO_"
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publicint getNextIndex(){ Hvqvggfi
int nextIndex = getStartIndex() + A#;6~f
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pageSize; $;7,T~{
if(nextIndex >= totalCount) w=Ai?u
return getStartIndex(); 4efIw<1_
else VBnD:w"z
return nextIndex; (#I$4Px{
} KmS$CFsGL
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publicint getPreviousIndex(){ 8_byS<b8
int previousIndex = getStartIndex() - p+M#hF5o
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pageSize; qaJ$0,]H+
if(previousIndex < 0) O&BNhuW2
return0; " kp+1sG8
else }
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return previousIndex; ?+Gc.lU
} 1<|\df.
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} sNB*S{
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抽象业务类 X 4L"M%i
java代码: K^32nQX
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/** V /i~IG`h/
* Created on 2005-7-12 T:FaD V{
*/ 9dS <^E(ZF
package com.javaeye.common.business; cdd6*+E
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import java.io.Serializable; p+x}$&<|
import java.util.List; 6=N!()s
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import org.hibernate.Criteria; pQ~Y7
import org.hibernate.HibernateException; E>LZw>^YJ
import org.hibernate.Session; ;c tPe[5
import org.hibernate.criterion.DetachedCriteria; *<HA])D,
import org.hibernate.criterion.Projections; Pgug!![
import `U4e]Qh/+
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org.springframework.orm.hibernate3.HibernateCallback; i ZU1w7Z
import +az=EF
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org.springframework.orm.hibernate3.support.HibernateDaoS O q3aboAt
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upport; \B/!}Tn;
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import com.javaeye.common.util.PaginationSupport; 9}-;OJe
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public abstract class AbstractManager extends Gx)U~L$B
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HibernateDaoSupport { ,I|3.4z
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privateboolean cacheQueries = false; pu-X -j
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privateString queryCacheRegion; FTgqE@
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publicvoid setCacheQueries(boolean k'6x_
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cacheQueries){ 2^aXXPC
this.cacheQueries = cacheQueries; 2xxw8_~C
} P>U7RX
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publicvoid setQueryCacheRegion(String DpbprT7_
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queryCacheRegion){ .n\j<Kq
this.queryCacheRegion = 7&`Yl[G
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queryCacheRegion; z( !K8
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} O'rz
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publicvoid save(finalObject entity){ >mAi/TZC
getHibernateTemplate().save(entity); ew+>?a'&L
} !8Y$}
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publicvoid persist(finalObject entity){ X_HU?Q_N
getHibernateTemplate().save(entity); :DG7Z
} PenkqDc}
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publicvoid update(finalObject entity){ 1[]
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getHibernateTemplate().update(entity); QnJd}(yN
} #fVk;]u`[3
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publicvoid delete(finalObject entity){ %\f<N1~*
getHibernateTemplate().delete(entity); `RlMfd
}
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publicObject load(finalClass entity, \"7U,y',
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finalSerializable id){ Xk>YiV",?
return getHibernateTemplate().load > I>=/i^
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(entity, id); 1j_
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} 'ZFbyt Q2
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publicObject get(finalClass entity, 6DuA
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finalSerializable id){ dKpUw9C#/
return getHibernateTemplate().get Ud:;kI%Vj
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(entity, id); .Lm0$o*`
} DCP
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publicList findAll(finalClass entity){ Uz_OUTFM
return getHibernateTemplate().find("from G,X> f?
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" + entity.getName()); ,p' ;Xg6ez
} ubs>(\`q"
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publicList findByNamedQuery(finalString RI2/hrW
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namedQuery){ (`"87Xomnn
return getHibernateTemplate U|~IJU3-
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().findByNamedQuery(namedQuery); Sa9p#OQ
} kInU,/R*
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publicList findByNamedQuery(finalString query, R ~? 9+
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finalObject parameter){ je;|zfe]
return getHibernateTemplate ^wlo;.8Y
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().findByNamedQuery(query, parameter); /0YO`])"
} :h8-y&;
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publicList findByNamedQuery(finalString query, cT|aQM@iW
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finalObject[] parameters){ 7r{159&=
return getHibernateTemplate |wM<n
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().findByNamedQuery(query, parameters); G%MdZg&i
} :Aa5,{v_
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publicList find(finalString query){ 3H`r|R
return getHibernateTemplate().find gxc8O).5vY
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(query); )v+\1
} UT%?3}*u"
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publicList find(finalString query, finalObject @MxB
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parameter){ M*Ri1
return getHibernateTemplate().find YP`/dX"4
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(query, parameter); | Zj=E$
} s x2\
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public PaginationSupport findPageByCriteria ~COd(,ul
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(final DetachedCriteria detachedCriteria){ !bBx'
return findPageByCriteria mvu$
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); ,56objaE
} M7.H;.?
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public PaginationSupport findPageByCriteria \hDjZ
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(final DetachedCriteria detachedCriteria, finalint )@_5}8
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startIndex){ -r%k)4_
return findPageByCriteria "b[w%KYyl
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(detachedCriteria, PaginationSupport.PAGESIZE, ]6].l$%z#
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startIndex); .zo>,*:t
} B*otquz
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public PaginationSupport findPageByCriteria do DpTwvh
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(final DetachedCriteria detachedCriteria, finalint Yu:!l>
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pageSize, !"SuE)WM
finalint startIndex){ ]SL0Mn g8
return(PaginationSupport) ys9'1+9
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getHibernateTemplate().execute(new HibernateCallback(){ >{eGSSG0
publicObject doInHibernate LLPbZ9q
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(Session session)throws HibernateException { z4r g.ai
Criteria criteria = <|;)iT1VeT
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detachedCriteria.getExecutableCriteria(session); -Q"
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int totalCount = MNocXK
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((Integer) criteria.setProjection(Projections.rowCount Id=g!L|
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()).uniqueResult()).intValue(); "]hQ\b\O
criteria.setProjection ZDr&Alp)o
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(null); bj_oA
i
List items = .-}F~FES
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criteria.setFirstResult(startIndex).setMaxResults &6^QFqqW`-
/^':5"=o
(pageSize).list(); %Wa. 2s
PaginationSupport ps = _$m1?DZ
=-;J2Qlg6
new PaginationSupport(items, totalCount, pageSize, L+Q.y~
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startIndex); c}mWAZ=wF
return ps; 1Wb_>`;
} h[oI/X
}, true); VH6J
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} jbTsrj"g
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public List findAllByCriteria(final wqA7_
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DetachedCriteria detachedCriteria){ .iZo/_
return(List) getHibernateTemplate `Zd\d:Wyv
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().execute(new HibernateCallback(){ -$o4WSd~
publicObject doInHibernate @WICAC=
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(Session session)throws HibernateException { d7qYz7=d
Criteria criteria = /XXy!=1J
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detachedCriteria.getExecutableCriteria(session); kGW4kuh)/q
return criteria.list(); /yFs$t>9
} W6jdS;3
}, true); ehyCAp0oI
} >tTu1#t
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public int getCountByCriteria(final x"{WLZ
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DetachedCriteria detachedCriteria){ Itv}TK
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Integer count = (Integer) vu`,:/|h
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getHibernateTemplate().execute(new HibernateCallback(){ oETl?Vt
publicObject doInHibernate @]@6(To
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(Session session)throws HibernateException { 8Lr&-w8J
Criteria criteria = UOcO\EA+
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detachedCriteria.getExecutableCriteria(session); >rid3~
return ?VR:e7|tU
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criteria.setProjection(Projections.rowCount P:fcbfH+
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()).uniqueResult(); x#}{z1op9
} g @qrVQv
}, true); h4tAaPcS+
return count.intValue(); v-!^a_3Ui
} Og<nnq
} A_2oQ*
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% jSB9
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用户在web层构造查询条件detachedCriteria,和可选的 XY!0yAK(!
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 Yqb3g(0
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PaginationSupport的实例ps。 Jo4iWJpK
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ps.getItems()得到已分页好的结果集 H1-eMDe
ps.getIndexes()得到分页索引的数组 i2X%xYv ^
ps.getTotalCount()得到总结果数 BTDUT%Yfg
ps.getStartIndex()当前分页索引 vY!'@W
ps.getNextIndex()下一页索引 FS7@6I2Ts
ps.getPreviousIndex()上一页索引 }N0v_Nas;v
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 -d_7 q
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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 JXq l=/%
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一下代码重构了。 m*~Iu<5L
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我把原本我的做法也提供出来供大家讨论吧: ]? %*3I
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首先,为了实现分页查询,我封装了一个Page类:
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java代码: |H
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/*Created on 2005-4-14*/ {8T/;K@
package org.flyware.util.page; Y>Fh<"A|$
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/** @@d6,=
* @author Joa &*#Obv
* bDjm:G
*/ CqR^w(
publicclass Page { S(PU"}vZy
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/** imply if the page has previous page */ 5F$~ZDu
privateboolean hasPrePage; "wnN
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/** imply if the page has next page */ 'nN'bVl/
privateboolean hasNextPage; uYCWsw/
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/** the number of every page */ f f5 e]^,
privateint everyPage; CkR
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/** the total page number */ 8:fq!m
privateint totalPage; U# U*^#
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/** the number of current page */ qh#?a'
privateint currentPage; RX?y}BDo0
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/** the begin index of the records by the current PnZY%+[I
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query */ `oOVR6{K9
privateint beginIndex; s y>}2orj~
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/** The default constructor */ _B7+n"t\r
public Page(){ "=,IbC
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} odKdpa
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/** construct the page by everyPage szGGw
* @param everyPage /a}`
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* */ K)W:@,*
public Page(int everyPage){ ZKt`>KZ
this.everyPage = everyPage; !OV+=Rwdx
} e#!p6+#"
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/** The whole constructor */ `J%35
public Page(boolean hasPrePage, boolean hasNextPage, AmB*4p5b
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int everyPage, int totalPage, a/xnf<(H
int currentPage, int beginIndex){ "f:_(np,
this.hasPrePage = hasPrePage; Ou{VDE
this.hasNextPage = hasNextPage; zg$NrI&
this.everyPage = everyPage; <Yn-sH
this.totalPage = totalPage; GDYFhH7H
this.currentPage = currentPage; 5xhYOwQBo
this.beginIndex = beginIndex; w^MiyX
} &] O^d4/
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/** sp6A*mwl
* @return EbnV"]1
* Returns the beginIndex. <=]:ED $V@
*/ 1!;4I@W(I)
publicint getBeginIndex(){ 7X <#
return beginIndex; Y'yGhpT~
} ;%Kh~
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/** 3;F up4!4}
* @param beginIndex ` >[Offhd
* The beginIndex to set. $l_\9J913
*/ @3`Pq2<
publicvoid setBeginIndex(int beginIndex){ %xdyGAl:
this.beginIndex = beginIndex; WHcw5_3#
} ,L\>mGw
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/** [D2<)
* @return 2 }rYH;Mx
* Returns the currentPage. :{%~L4$HI
*/ h/]));p
publicint getCurrentPage(){ dg#w!etB
return currentPage; R%"'k<`#
} PAXm
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/** w d6+,B
* @param currentPage 4e?MthJ>
* The currentPage to set. Qn}M
*/ ?hKpJA'%
publicvoid setCurrentPage(int currentPage){ ^*b11/7
this.currentPage = currentPage; 0~BZh%s< (
} A().1h1_k
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/** vf-8DB
* @return ]Xg7XY
* Returns the everyPage. 7n7UL0Oc1
*/ ?@QcKQ@
publicint getEveryPage(){ e17]{6y
return everyPage; NmTo/5s
} D!mx &O9
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/** \7G.anY
* @param everyPage C0W-}H
* The everyPage to set. E.G]T#wt0
*/ |a=7P
publicvoid setEveryPage(int everyPage){ >aT~G!y
this.everyPage = everyPage; JZ/T:Hsh4
} *fI\|%K
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/** t@jke
* @return 5ljEh -
* Returns the hasNextPage. 6S^JmYq
*/ :XB^IyO-A
publicboolean getHasNextPage(){ 3x>Y
return hasNextPage; f1
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} JG@Zb}b
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/** ?N&s.
* @param hasNextPage 1ezBnZJg
* The hasNextPage to set. ohi0_mBz
*/ #!t6'*
publicvoid setHasNextPage(boolean hasNextPage){ Y?:"nhN
this.hasNextPage = hasNextPage; r-,u)zf"
} *9(E0"
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/** EPU3Jban
* @return [0lO0ik>G
* Returns the hasPrePage. .:=5|0m
*/ rN'}IS@5
publicboolean getHasPrePage(){ |OIU)53A-
return hasPrePage; Se>v|6
} h]&o)%{4
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/** ?;ZnD(4?
* @param hasPrePage $`<-;kI
* The hasPrePage to set. !*o{xq
*/ {}P~nP
publicvoid setHasPrePage(boolean hasPrePage){ <GSp%r
this.hasPrePage = hasPrePage;
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} oo|Nu+
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/** '`j MNKn\
* @return Returns the totalPage. OV`li#H
* J:G{
*/ NMESGNa)z
publicint getTotalPage(){ 9]:F!d/
return totalPage; fvj
} yh{U!hG
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/** ]j]<CqG
* @param totalPage Kxi@"<`S
* The totalPage to set. 63kZ#5g(Dw
*/ L$ZsNs+
publicvoid setTotalPage(int totalPage){ PoD/i@
this.totalPage = totalPage; &;U
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} p,14'HS%@
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} M6y|;lh''c
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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 _O&P!hI
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个PageUtil,负责对Page对象进行构造: rVwW%&
java代码: S 9;FD 3
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/*Created on 2005-4-14*/ {Rn*)D9
package org.flyware.util.page; @_?Uowc8
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import org.apache.commons.logging.Log; [X kWPx`
import org.apache.commons.logging.LogFactory; B?ipo,2~{
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/** k0D):
* @author Joa B.~[m}
* rdH^"(
*/ YD#L@:&gv
publicclass PageUtil { ?O0,)hro
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privatestaticfinal Log logger = LogFactory.getLog \W|ymV_Ki
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(PageUtil.class); .Dy2O*`
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/** B/B`=%~5_^
* Use the origin page to create a new page .e\PCf9v
* @param page lDVgW}o@
* @param totalRecords ^G
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* @return 4@0Z<8Mo
*/ }S{VR(i`J
publicstatic Page createPage(Page page, int lYU?j|n
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totalRecords){ zUWeOR'X
return createPage(page.getEveryPage(), SPnW8
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page.getCurrentPage(), totalRecords); KBA&s
} Z>*a:|
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/** sTvw@o*
* the basic page utils not including exception uEkGo5
D8`SI21P
handler Nj +^;Y
* @param everyPage DIgur}q)@
* @param currentPage A(z
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* @param totalRecords QiaBZAol
* @return page h]}DMVV]
*/ dwb ^z+
publicstatic Page createPage(int everyPage, int T*k}E
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currentPage, int totalRecords){ hJ?PV@xy
everyPage = getEveryPage(everyPage); H-eHX3c7
currentPage = getCurrentPage(currentPage); )U{\c2b
int beginIndex = getBeginIndex(everyPage, hLT?aQLx
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currentPage); :bkmm,%O
int totalPage = getTotalPage(everyPage, -X-sykDm
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totalRecords); M]xfH *
boolean hasNextPage = hasNextPage(currentPage, z~/e\
.>2]m[53
totalPage); xF*i+'2
boolean hasPrePage = hasPrePage(currentPage); xrkR)~ E
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returnnew Page(hasPrePage, hasNextPage, ~DS.b-E
everyPage, totalPage, v3wq-
currentPage, H>%L@Btw
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beginIndex); 'Jd*r(2d
} 5+t$4N+P
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privatestaticint getEveryPage(int everyPage){ {D8yqO A}
return everyPage == 0 ? 10 : everyPage; Ged} qXn
} #Fkp6`Q$x
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privatestaticint getCurrentPage(int currentPage){ E0.o/3Gw6
return currentPage == 0 ? 1 : currentPage; - *qoF(/U
} <KX+j,4
3 ;AJp_;
privatestaticint getBeginIndex(int everyPage, int z Ece>=C
D#[<N
currentPage){ lkJe7 +s
return(currentPage - 1) * everyPage; 5=1Ml50
} wJu9.
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privatestaticint getTotalPage(int everyPage, int `chD*@76I
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totalRecords){ [EK@f,iM
int totalPage = 0; 83VFBY2q
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if(totalRecords % everyPage == 0) .etG>tH
totalPage = totalRecords / everyPage; [rz5tfMp
else YUTI)&y
totalPage = totalRecords / everyPage + 1 ; +K,T^<F;
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return totalPage; szD9z{9"y
}
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privatestaticboolean hasPrePage(int currentPage){ Bve',.xH
return currentPage == 1 ? false : true; eV"Uv3
} FM|3'a-z
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privatestaticboolean hasNextPage(int currentPage, gL`aLg_
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int totalPage){ V5gr-^E
return currentPage == totalPage || totalPage == _>_"cKS
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0 ? false : true; @h(Z;
} bk]g}s
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} WA.c.{w\
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 iDdR-T|
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 (-VH=,Md
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做法如下: 8!MVDp[|"
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 OHv9|&Tpl
2'Raj'2S4
的信息,和一个结果集List: }0]iS8*tL
java代码: PGuPw'2;[
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/*Created on 2005-6-13*/ ""IPaNHQ
package com.adt.bo; yoz-BS
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import java.util.List; "G Jhx/zt
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import org.flyware.util.page.Page; k#Qjm9V
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/** <- R%
* @author Joa tH:?aP*2
*/ -![{Zb@
publicclass Result { Jgy6 !qUn_
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private Page page; %.8(R
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private List content; Swgvj(y;!A
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/** 0^6}s1d_
* The default constructor <SdOb#2
*/ #c9MVQ_
public Result(){ b#n
super(); 65tsJ"a<
} >fD%lq;
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/** %VE FruM
* The constructor using fields <3Rq!w/
* q(BRJ(
* @param page ]deO\mB
* @param content OaY]}4tI$
*/ 3h6,x0AG
public Result(Page page, List content){ Jg$ NYs.xZ
this.page = page; TN/&^/
this.content = content; /K;A bE
} M&e=LV
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/** WGo ryvEx
* @return Returns the content. !e~d,NIy
*/ "$q"Kilj%
publicList getContent(){ ob/HO(h3
return content; oWggh3eXk
} D\E"v,Y\+O
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/** .tsXQf
* @return Returns the page. ~`5[Li:eP
*/ Psm9hP :m
public Page getPage(){ |T-Ytuy8
return page; AP9\]qZ(7
} m"o=R\C
Mb97S]878I
/** Ifq|MZ\
* @param content ;a[3RqmKW
* The content to set. 1yeD-M"w
*/ Djf~8q V!
public void setContent(List content){ Z*(OcQ-
this.content = content; bNoZ{ 7
} gL1r"&^L
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/** Ko
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* @param page \?^ EFA+;
* The page to set. C*Qx
*/ s}DNu<"g
publicvoid setPage(Page page){ NkQain9
this.page = page; hJX;/~L
} ^plP1c:
} $GVf;M2*
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2. 编写业务逻辑接口,并实现它(UserManager, \_+Af`
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UserManagerImpl) fUJe{C<H
java代码: 5!6}g<z&L
Mi`t$hmP
_HAr0R8BY
/*Created on 2005-7-15*/ ke'OT>8
package com.adt.service; g}vU*g
;
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import net.sf.hibernate.HibernateException; avqJ[R
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import org.flyware.util.page.Page; @d|]BqQ4jh
V_9\Ax'X
import com.adt.bo.Result; @VsK7Eo
fi6_yFl
/** 6X$\:>
* @author Joa XLm@, A[
*/ u7-0?
publicinterface UserManager { 5jTA6s9z A
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