Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 C?xah?Sk
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 uPe&i5YR
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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 ,, 8hU7P
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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 N>zpxU {
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分页支持类: $-J0ou8~
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java代码: ,.<[iHC}9
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package com.javaeye.common.util; L=7Y~aL=
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import java.util.List; L<7KmN4VX
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publicclass PaginationSupport { ";kwh8wB
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publicfinalstaticint PAGESIZE = 30; 5`_UIYcI
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privateint pageSize = PAGESIZE; 9$
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privateList items; 1<9=J`(H
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privateint totalCount; sKg
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privateint[] indexes = newint[0]; =&_Y=>rA]0
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privateint startIndex = 0; \!51I./Q/
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public PaginationSupport(List items, int Z2t'?N|_
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totalCount){ %%-?~rjI
setPageSize(PAGESIZE); qsA`\%]H
setTotalCount(totalCount); S9
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setItems(items); ' ?4\
setStartIndex(0); $D][_ I
} w\K(kNd(
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public PaginationSupport(List items, int *GZ7S
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totalCount, int startIndex){
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setPageSize(PAGESIZE); s)A=hB-V
setTotalCount(totalCount); -X]?ql*%`
setItems(items); F.Sc2n@7-
setStartIndex(startIndex); S5+W<Qs
} 1B0+dxN`
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public PaginationSupport(List items, int v1R t$[
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totalCount, int pageSize, int startIndex){ (drDC1\
setPageSize(pageSize); EGL7z`nt
setTotalCount(totalCount); zObrp
setItems(items); #0*oj/
setStartIndex(startIndex); srGF=1_
} (nDen5Q|
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publicList getItems(){ _xmS$z)TO
return items; i-YSt5iq
} x :? EL)(
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publicvoid setItems(List items){ IaHu$` v
this.items = items; `
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} >zS<1
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publicint getPageSize(){ rw }wQP_'
return pageSize; `9`T,uJe
} _'}Mg7,V
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publicvoid setPageSize(int pageSize){ m\.(-
this.pageSize = pageSize; }8LTYn
} Z.%0yS_T
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publicint getTotalCount(){ y5/LH~&Ov
return totalCount; Hp(wR'(g&
} NY3/mS3w
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publicvoid setTotalCount(int totalCount){ >(\Z-I&YQ
if(totalCount > 0){ Q`zW[Y&]
this.totalCount = totalCount; =K;M\_k%y
int count = totalCount / >Tp`Kri
2[X\*"MQ2
pageSize; DedY(JOvB
if(totalCount % pageSize > 0) #zed8I:w
count++; T1U8ZEK<iu
indexes = newint[count]; |44 E:pA
for(int i = 0; i < count; i++){ C@P*:L_
indexes = pageSize * _@D"XL#L
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i; \Gm\sy
} laQ{nSVBm
}else{ C~X"ZW:d[
this.totalCount = 0; nJ|M
} d "%6S*dL
} ]j+J^g
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publicint[] getIndexes(){ le150;7
return indexes; ^JY,K
} pmuT7*<19
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publicvoid setIndexes(int[] indexes){ =`OnFdI
this.indexes = indexes; Ca}V5O
} l_i&8*=Px
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publicint getStartIndex(){ QIC? `hk1
return startIndex; fA"9eUu
} )ZMR4U$+v
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publicvoid setStartIndex(int startIndex){ jAxrU
if(totalCount <= 0) XR+
this.startIndex = 0; zrL +:/t
elseif(startIndex >= totalCount) q^eLbivVE
this.startIndex = indexes nC5]IYL|
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[indexes.length - 1]; ly::?
elseif(startIndex < 0) V)Ze>Pp
this.startIndex = 0; )W^$7Em
else{ b#W(&b^q
this.startIndex = indexes
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[startIndex / pageSize]; /wPW2<|"X.
} eZ|_wB'r
} lQqP4-E?
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publicint getNextIndex(){ Y(;u)uN_
int nextIndex = getStartIndex() + E[Bj+mX9
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pageSize; 'Gqo{wl
if(nextIndex >= totalCount) mCSt.n~
return getStartIndex(); FnCMr_
else \ch4c9
return nextIndex; dYZB>
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} i}/Het+(
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publicint getPreviousIndex(){ C#@-uo2
int previousIndex = getStartIndex() - PM3fJhx
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pageSize; ]2rCn};
if(previousIndex < 0) 6T6UIq
return0; ,*Z/3at}5M
else d Z}|G-:
return previousIndex; 4l@aga
} JOo+RA5d
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} |&_(I
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抽象业务类 gTk*v0WBm
java代码: v,jB(B^|Z
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/** :_:o%
* Created on 2005-7-12 E&;;2
*/ XB<Q A>dLh
package com.javaeye.common.business; P=m
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import java.io.Serializable; a,eEP43dn
import java.util.List; scPvuHzl
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import org.hibernate.Criteria; 0QY9vuhL<
import org.hibernate.HibernateException; Ga\kvMtr
import org.hibernate.Session; XblZlWP#
import org.hibernate.criterion.DetachedCriteria; /Zg4JQ~
import org.hibernate.criterion.Projections; ,VZ<r5NT
import +&[X7r<
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org.springframework.orm.hibernate3.HibernateCallback; km29]V=}
import [6CWgQ%Ue
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org.springframework.orm.hibernate3.support.HibernateDaoS #ds@!u+&
7 b8pWM
upport; M%2w[<-8c
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import com.javaeye.common.util.PaginationSupport; j/uzsu+
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public abstract class AbstractManager extends W#foVAi .
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HibernateDaoSupport { u@T,8
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privateboolean cacheQueries = false; 22Oe~W;
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privateString queryCacheRegion; nTHCb>,vM
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publicvoid setCacheQueries(boolean G|j8iV O
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cacheQueries){ [0H]L{yV
this.cacheQueries = cacheQueries; .[o`TlG%
} BOme`0A
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publicvoid setQueryCacheRegion(String Hm]\.ZEy
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queryCacheRegion){ 9`Xr7gmQf
this.queryCacheRegion = DI=?{A
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queryCacheRegion;
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} ivvm.7{
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publicvoid save(finalObject entity){ V82hk0*j
getHibernateTemplate().save(entity); Z`>m
} k<
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publicvoid persist(finalObject entity){ Q+dLWFI
getHibernateTemplate().save(entity); ~N8$abQJV
} m{by%
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publicvoid update(finalObject entity){ Q1P=A:*]9
getHibernateTemplate().update(entity); l8+;)2p!
} 7w.9PNhy
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publicvoid delete(finalObject entity){ RP%FMb}nt
getHibernateTemplate().delete(entity); LUEZqIf
} [{6fyd;
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publicObject load(finalClass entity, #NWS)^&1b
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finalSerializable id){ |)%;B%
return getHibernateTemplate().load V(0V$&qipc
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(entity, id); > mEB,
} vvF]g.,
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publicObject get(finalClass entity, u_6x{",5I
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finalSerializable id){ ;Mz7emt
return getHibernateTemplate().get \`-a'u=S
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(entity, id); =$#=w?~%
} n W:Bo#
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publicList findAll(finalClass entity){ j5G=ZI86y
return getHibernateTemplate().find("from ZC3;QKw>
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" + entity.getName()); $J*lD-h-
} @gk{wh>c
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publicList findByNamedQuery(finalString P9q ZjBS
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namedQuery){ PBgU/zVn
return getHibernateTemplate T}K@ykT
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().findByNamedQuery(namedQuery); KB8_yo{y
} yo
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publicList findByNamedQuery(finalString query, "6>+IF
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finalObject parameter){ B4x@{rtER
return getHibernateTemplate om8`^P/b
h/..cVD,K
().findByNamedQuery(query, parameter); X;CRy,
} LQJC ]*b1
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publicList findByNamedQuery(finalString query, .Xk#Cwm'
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finalObject[] parameters){ ^a=V.
return getHibernateTemplate 7myYs7N8[
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().findByNamedQuery(query, parameters); =L*-2cE6#
} C%AN4Mo
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publicList find(finalString query){ .yQ<
return getHibernateTemplate().find EKNmXt1
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(query); E6fs&
} {gI% -
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publicList find(finalString query, finalObject ]:~z#k|2@6
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parameter){ 'k/:3?R
return getHibernateTemplate().find _eUd
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(query, parameter); *z)+'D*+
} R6\|:mI,$
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public PaginationSupport findPageByCriteria r}-vOPn`E
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(final DetachedCriteria detachedCriteria){ p:3
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return findPageByCriteria 4VHX4A}CgA
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); eHUb4,%P
} +<fT\Oq#
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public PaginationSupport findPageByCriteria VMw[M^
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(final DetachedCriteria detachedCriteria, finalint *|6*jU
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startIndex){ k\A4sj
return findPageByCriteria tkW7wP;
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(detachedCriteria, PaginationSupport.PAGESIZE, ,D\}DJ`)C
"=yz}~,
startIndex); #2;8/"v
} &90pKs
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public PaginationSupport findPageByCriteria p/KG{-f,
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(final DetachedCriteria detachedCriteria, finalint >w#&fd
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pageSize, g:Fo7*i
finalint startIndex){ rN`-ak
return(PaginationSupport) e5m]mzF@
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getHibernateTemplate().execute(new HibernateCallback(){ kg^5D3!2{Q
publicObject doInHibernate ]P)2Q!X
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(Session session)throws HibernateException { `h<>_zpjY
Criteria criteria = 3]67U}`
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detachedCriteria.getExecutableCriteria(session); X)S4vqf}
int totalCount = Kc+TcC
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((Integer) criteria.setProjection(Projections.rowCount C^*}*hYk$
}[]1`2qD
()).uniqueResult()).intValue(); &;%,Axc
criteria.setProjection n\u3$nGL1`
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(null); [S?`OF12
List items = Og?P5&C"9D
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criteria.setFirstResult(startIndex).setMaxResults Nl9}*3r
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(pageSize).list(); U|v@v@IBA
PaginationSupport ps = z;\,Dt
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new PaginationSupport(items, totalCount, pageSize, D{M&>.
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startIndex); xOKf|
return ps; ,<U
} bRI `ZT0
}, true); 7A{,)Y/w ^
} q5~"8]Dls
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public List findAllByCriteria(final _7,4C?
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DetachedCriteria detachedCriteria){ B0,C!??5
return(List) getHibernateTemplate x{1S!A^
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().execute(new HibernateCallback(){ lLN5***47J
publicObject doInHibernate ?F9c6 $|
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(Session session)throws HibernateException { {emym$we
Criteria criteria = v[<;z(7Qk
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detachedCriteria.getExecutableCriteria(session); (4C_Ft*~j
return criteria.list(); %+L3Xk]m'
} `ex>q
}, true); XF`?5G~~#
} _o{w<b&
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public int getCountByCriteria(final L^??*XEUJ
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DetachedCriteria detachedCriteria){ SlD7 \X&~
Integer count = (Integer) D()tP
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getHibernateTemplate().execute(new HibernateCallback(){ .]ZMxDZ
publicObject doInHibernate (`&E^t
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(Session session)throws HibernateException { Y#rd'
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Criteria criteria = 0E/16@6=
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detachedCriteria.getExecutableCriteria(session); |[MtUWEW
return A8 j$c ~
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criteria.setProjection(Projections.rowCount jGtu>|Gj
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()).uniqueResult(); q uiX"lV(
} >"pHk@AW K
}, true); e{}vT$-
return count.intValue(); P@8S|#LpZ
} <MgC7S2I
} LmjGU[L,@
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用户在web层构造查询条件detachedCriteria,和可选的 z{A~d
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 mZ#h p}\.
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PaginationSupport的实例ps。 _PGS"O?j
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ps.getItems()得到已分页好的结果集 j&Y{
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ps.getIndexes()得到分页索引的数组 )q>q]eHz
ps.getTotalCount()得到总结果数 .Tc?PmN
ps.getStartIndex()当前分页索引 "T' QbK0
ps.getNextIndex()下一页索引 [ Ru( H
ps.getPreviousIndex()上一页索引 D[<~^R;*
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 "eR-(c1
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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 (?#"S67
N.q0D5 :
一下代码重构了。 k1Sr7|
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我把原本我的做法也提供出来供大家讨论吧: tJ Mm
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首先,为了实现分页查询,我封装了一个Page类: I$JyAj
java代码: .pPtBqp
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/*Created on 2005-4-14*/ F tay8m@f
package org.flyware.util.page; koy0A/\%
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/** ?T_bjALW
* @author Joa +"JQ5~7
* RwDXOdgu
*/ MsjC4(Xla.
publicclass Page { l` ?4O
c->?'h23)
/** imply if the page has previous page */ M`QK{$1p
privateboolean hasPrePage; ?xb2jZ/0X
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/** imply if the page has next page */ lfyij[6q+
privateboolean hasNextPage; x(y=.4Yf+
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/** the number of every page */ lCJ/@)
privateint everyPage; KBwY _
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/** the total page number */ lcuqzX{7
privateint totalPage; u~\ NL{
DXx),?s>
/** the number of current page */ ad`=A V ]
privateint currentPage; Jek3K&
|#x]/AXa0/
/** the begin index of the records by the current F7U$7(I2G
HC(o;,spO
query */ JwcC9
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privateint beginIndex; RgLk AHA
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/** The default constructor */ E
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public Page(){ 4|xQQv
f(.t0{Etq
} BaOPtBYA:
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/** construct the page by everyPage %oiA'hz;*
* @param everyPage SaiYdJ
* */ s^ K:cz
public Page(int everyPage){ d?>pcT)G_
this.everyPage = everyPage; &|c] U/_w
} o`7B@]
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/** The whole constructor */ `lN
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public Page(boolean hasPrePage, boolean hasNextPage, f^ 6da6Z
);L +)UV
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int everyPage, int totalPage, 4/E>k <MA
int currentPage, int beginIndex){ -k}&{v
this.hasPrePage = hasPrePage; -SKcS#IF
this.hasNextPage = hasNextPage; -|`E'b81
this.everyPage = everyPage; f4&k48Ds
this.totalPage = totalPage; m,#Us
this.currentPage = currentPage; Y$N D
this.beginIndex = beginIndex;
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} F/0x`l
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/** *","u;&
* @return <77v8=as5
* Returns the beginIndex. ,=y8[(h
*/ UjH+BC+9`b
publicint getBeginIndex(){ }7Y@u@R
return beginIndex; lBfG#\rdW~
} J]qx4c
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/** ~A-VgBbU>_
* @param beginIndex ~+O ws
* The beginIndex to set. x).`nZ1
*/ bb"x^DtT
publicvoid setBeginIndex(int beginIndex){ ,[)f-FmcU
this.beginIndex = beginIndex; uqK[p^{
} [C( >e0r
JU RJN+)z
/** 19;F+%no#
* @return t$5)6zG
* Returns the currentPage. D8wZC'7
*/ BV6
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publicint getCurrentPage(){ LKI2R_|n
return currentPage; M;1B}x@
} Ub<^;Du5
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/** L_ 2R3w
* @param currentPage ~VaO,8&+L
* The currentPage to set. J7s\
*/ C_
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publicvoid setCurrentPage(int currentPage){ N1jJ(}{3
this.currentPage = currentPage; ,)P6fa/
} Xsv^GmP+
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/** `#>JRQ=
* @return aOTrng
* Returns the everyPage. $Qq5Fx9kU
*/ 9$e6?<`(Y
publicint getEveryPage(){ ]6TX)1
return everyPage; *OMW" NZ;
} _33YgO
EPL"H:o5%<
/** (X}Q'm$n\h
* @param everyPage
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* The everyPage to set. pPtw(5bH
*/ ~h6aTN
publicvoid setEveryPage(int everyPage){ $sBje*;
this.everyPage = everyPage; yZ57uz
} %<Kw
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/** e8$OV4X
* @return {B+{2;Zk
* Returns the hasNextPage. ICB'?yZ,
*/ qW'5Zk
publicboolean getHasNextPage(){ %[7<GcWl
return hasNextPage; WbDD9ZS
} EJZb3
L$<(HQQJ8
/** Fg-4u&Ik
* @param hasNextPage ?&GV~DYxA
* The hasNextPage to set. !L\P.FP7b
*/ UA$Xa1
publicvoid setHasNextPage(boolean hasNextPage){ XoqmT/P
this.hasNextPage = hasNextPage; ?^W`7H F%0
} 0w<qj T^U
xlU:&=|
/** \,G7nT
* @return #Yr/GNN
* Returns the hasPrePage. 29GcNiE`T
*/ k4Ub+F
publicboolean getHasPrePage(){ 6qzy eli
return hasPrePage; 6I,4 6 XZ-
} (DrDWD4_
~q05xy8
/** /E0/)@pDq
* @param hasPrePage r2; )VS
* The hasPrePage to set. MuCnBx
*/ +^v]d_~w_
publicvoid setHasPrePage(boolean hasPrePage){ H@!kgaNF
this.hasPrePage = hasPrePage; v^QUYsar
} &[iunJv:eq
8ECBi(
/** 8WvQ[cd
* @return Returns the totalPage. %44Z7
* WjsE#9D!of
*/ A~7q=-
publicint getTotalPage(){ "I`g(q#Uo
return totalPage; wUBug
} HtbN7V/
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/** Q]oCzSi
* @param totalPage e#jkp'
* The totalPage to set. FfR%@
V'
*/ H`028^CH$
publicvoid setTotalPage(int totalPage){ S((\KL,
this.totalPage = totalPage; U>jLh57
} \:D'u<8E
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} 1#2B1&
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Fi*j}4F1
H(k-jAO,
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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 1l*O;J9By
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个PageUtil,负责对Page对象进行构造: =ijVT_|u0
java代码: eLc@w<yB
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/*Created on 2005-4-14*/ / %:%la%
package org.flyware.util.page; 5EqC.g.
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import org.apache.commons.logging.Log; ~\~K,v
import org.apache.commons.logging.LogFactory; EM&;SQ;C9
iYHCa }
/** F;@A2WD
* @author Joa ;^`WX}]C(
* uEPdL':}2
*/ z'+k]N9Q^
publicclass PageUtil { eED@Z/~6
!c 3li .
privatestaticfinal Log logger = LogFactory.getLog #(KE9h%
ij/5m-{6)
(PageUtil.class); P:8P>#L
Sx^4Y\\
/** 4`mF6%UC
* Use the origin page to create a new page onOvE Y|R
* @param page ?c!W*`yP
* @param totalRecords ttaYtV]]
* @return oykqCN
*/ CF?TW
publicstatic Page createPage(Page page, int ,*Z:a4
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totalRecords){ V\(p6:1(6K
return createPage(page.getEveryPage(), Wk"\aoX"E
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page.getCurrentPage(), totalRecords); OY>0qj
} bBC!fh!L"
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/** |f.R]+cH
* the basic page utils not including exception }*ZOD1j
,{_;q:
handler -P5M(Rt
* @param everyPage O%n =n3
* @param currentPage cA8"Ft{P)
* @param totalRecords HLnizE
* @return page R6KS&Ge_
*/ E5y\t_H
publicstatic Page createPage(int everyPage, int Z$'483<
OVE5:)$x
currentPage, int totalRecords){ :O(<3"P/
everyPage = getEveryPage(everyPage); gU^2;C
currentPage = getCurrentPage(currentPage); u(`,7 o "
int beginIndex = getBeginIndex(everyPage, O)4P)KAO<
!ufSO9eDx"
currentPage); |GQFNrNx
int totalPage = getTotalPage(everyPage, (Z72 3)
AX= 4{b'
totalRecords); TT0~41&l
boolean hasNextPage = hasNextPage(currentPage, 1-=zSWmyK
edW:(19}
totalPage); Z}
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boolean hasPrePage = hasPrePage(currentPage); 0f<$S$~h
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returnnew Page(hasPrePage, hasNextPage,
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everyPage, totalPage, 1tNmiAu
currentPage, Ehv*E
lVmm`q6n9
beginIndex); [H!8m7i;
} zU7/P|Dw+
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privatestaticint getEveryPage(int everyPage){ GGY WvGE+
return everyPage == 0 ? 10 : everyPage; *A,h^
} uk(|c-_]~c
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privatestaticint getCurrentPage(int currentPage){ e{dYLQd
return currentPage == 0 ? 1 : currentPage; {{\
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} pM^r8kIH
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privatestaticint getBeginIndex(int everyPage, int iB:](Md'r
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currentPage){ JlF$|y,gV,
return(currentPage - 1) * everyPage; VZ:LK
} q-;z!iq|!
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privatestaticint getTotalPage(int everyPage, int -0{"QhdE%
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totalRecords){ a_pNFe
int totalPage = 0; \2K_"5
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if(totalRecords % everyPage == 0) >J \} &!8,
totalPage = totalRecords / everyPage; `XJU$c
else r3hUa4^97
totalPage = totalRecords / everyPage + 1 ; i8tH0w/(M
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return totalPage; 3%JPJuNVw
} m R3km1T
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privatestaticboolean hasPrePage(int currentPage){
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return currentPage == 1 ? false : true; *)2&gQ&%+
} (RL5L=,u
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privatestaticboolean hasNextPage(int currentPage, S$Cht6m
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int totalPage){ 16p$>a<6
return currentPage == totalPage || totalPage == {bSi3 oI
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0 ? false : true; ?G#T6$E8
} whzV7RT
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} pV3o\bk!
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上面的这两个对象与具体的业务逻辑无关,可以独立和抽象。 Rw54`_kFEB
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面对一个具体的业务逻辑:分页查询出User,每页10个结果。具体 4;*o}E
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做法如下: Dt9[uyP&
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 azj:Hru&t#
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的信息,和一个结果集List: vq df-i
java代码: X\I"%6$
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/*Created on 2005-6-13*/ y8$TU;
package com.adt.bo; ,~!rn}MI<
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import java.util.List; +~6gP!
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import org.flyware.util.page.Page; gCMwmanX
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/** O>=D1no*
* @author Joa )V}u}5
*/ S}=euY'i
publicclass Result { .H,wdzg)
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private Page page; %lw!4Z\gg
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private List content; FQbF)K~e
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/** f$lf(brQ:
* The default constructor X676*;:!.
*/ -`mHb
public Result(){ SWX;sM
super(); 9`/\|t|V
} ^<0azza/(
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/** ![wV}.}
* The constructor using fields z;dD
}Fo
* +v 9@du
* @param page B r GaCja
* @param content DQ{Yr>J
*/ >f [Lb|t
public Result(Page page, List content){ )"im|9
this.page = page; vwZrvjP2
this.content = content; ? jywW$
} <c[+60p"
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/** :
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* @return Returns the content. .c[v /SB]
*/ MCOz-8@|Y
publicList getContent(){ =R08B)yR
return content; Rw$>()}H8
} aj1o
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/** F[Dhj,C"
* @return Returns the page. .=WsB@+
*/ KJ
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public Page getPage(){ Z:l.{3J$
return page; \}0J%F1
} kKV`9&dZe
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/** ('/5#^%R
* @param content F d:A^]
* The content to set. -saisH6
*/ ;%r#pv~
public void setContent(List content){ QRs!B!Fn0
this.content = content; E\5cb[Y
} ':kj\$U
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/** $z-zscco
* @param page r-#23iT.~
* The page to set. f)xHSF"
*/ gDP\u<2!
publicvoid setPage(Page page){ ^^[MDjNy@
this.page = page; O]OZt,k(
} }MKm>N
} %Lec\(-4L
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2. 编写业务逻辑接口,并实现它(UserManager, ^<0u~u)%T
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UserManagerImpl) PTfy#
java代码: WlHw\\ur
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/*Created on 2005-7-15*/ qRMH[F$`
package com.adt.service; Jsee8^_~
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import net.sf.hibernate.HibernateException; |k~\E|^
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import org.flyware.util.page.Page; 4qtjP8Zv[
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import com.adt.bo.Result;
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/** ;eznONNF
* @author Joa Dp
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*/ _w+ix9Fr?
publicinterface UserManager { 2.=3:q!H<%
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public Result listUser(Page page)throws (\
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HibernateException; !br0s(|
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} >W,1s
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java代码: &:g5+([<