Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 7 DY WdDX
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 5pM&h~M
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 W-z90k4Z5
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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 rBD(2M
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分页支持类: !/j,hO4Z4
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java代码: %kh#{*q$
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package com.javaeye.common.util; g@~!kh,TH
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import java.util.List; 7}4'dW.
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publicclass PaginationSupport { o"p^/'ri
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publicfinalstaticint PAGESIZE = 30; |h&<_9
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privateint pageSize = PAGESIZE; bMN@H\Ek
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privateList items; e74zR6
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privateint totalCount; 0K<x=-cCB
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privateint[] indexes = newint[0]; }q% jO
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privateint startIndex = 0; g(aZT#i i=
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public PaginationSupport(List items, int "8 N"Udu
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totalCount){ ~>V-*NT8
setPageSize(PAGESIZE); 43zUN
setTotalCount(totalCount); .K IVf8)"
setItems(items); zv //K_
setStartIndex(0); 25:Z;J>
} xXX/]x>
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public PaginationSupport(List items, int bpCNho$
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totalCount, int startIndex){ ~e P
setPageSize(PAGESIZE); 9tn;L"#&N
setTotalCount(totalCount); >$\Bu]{1
setItems(items); 9)+@0fG)
setStartIndex(startIndex); ;7Y[c}V1^
} x?"#gK`3;
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public PaginationSupport(List items, int c-kA^z{f
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totalCount, int pageSize, int startIndex){ $I@GUtzjp
setPageSize(pageSize); 8pXKO"u],
setTotalCount(totalCount); kbxg_UI;
setItems(items); -Ep!- a
setStartIndex(startIndex); OL'P]=U
} m9$ a"$c
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publicList getItems(){ ?
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return items; G?`-]FMO
} KOey8tB)1
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publicvoid setItems(List items){ @o>EBZ7MS
this.items = items; !\-WEQrp\
} BkawL,
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publicint getPageSize(){ -/ +#5.`1
return pageSize; E{4 e<%Y,
} ~.^AL}zm_
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publicvoid setPageSize(int pageSize){ =su]w2,Iy
this.pageSize = pageSize; .2W"w)$nuq
} wN97_Y=`n
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publicint getTotalCount(){ &]F3#^!^
return totalCount; 7"4z+w
} &<3&'*ueW
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publicvoid setTotalCount(int totalCount){ :z&7W<
if(totalCount > 0){ /vxm"CJR
this.totalCount = totalCount; r^0F"9eOL
int count = totalCount / WBr59@V
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pageSize; ~g6 3qs
if(totalCount % pageSize > 0) (W[V?!1
count++;
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indexes = newint[count]; T 2F6)e
for(int i = 0; i < count; i++){ =>iA gp'#
indexes = pageSize * H1/?+N}(
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} S<`I
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}else{ -0Cnp/Yj@
this.totalCount = 0; :e<7d8E5n{
} {pL+2%`~
} 1oiRW Re
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publicint[] getIndexes(){ @-HG`c ct
return indexes; _oG&OJ@
} v&a4^s
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publicvoid setIndexes(int[] indexes){ asHxL!
this.indexes = indexes; tM4Cx
} 0@I S
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publicint getStartIndex(){ y5r4+2B
return startIndex; 7aV%=_
} ,:LA.o}h
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publicvoid setStartIndex(int startIndex){ SAYLG
if(totalCount <= 0) +N`ua
this.startIndex = 0; z2_6??tS/c
elseif(startIndex >= totalCount) km~Ll
this.startIndex = indexes [NMVoBvG
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[indexes.length - 1]; ;oZ)Wt
elseif(startIndex < 0) [AMAa]^
this.startIndex = 0;
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else{ -Eu6U`"(
this.startIndex = indexes tW
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[startIndex / pageSize]; MZ+^-@X
} / 0 O=(
} pRkP~ZISU
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publicint getNextIndex(){ Mmpfto%i
int nextIndex = getStartIndex() + ~ab:/!Z
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pageSize; Po%LE]v,
if(nextIndex >= totalCount) C8
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return getStartIndex(); dXF^(y]l
else F~h7{@\
return nextIndex; X}+>!%W!}
} o2<#s)GpY
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publicint getPreviousIndex(){ 0lhVqy}:}o
int previousIndex = getStartIndex() - "g$IP9?U
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pageSize; ^fZ&QK
if(previousIndex < 0) `
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return0; w!fE;H8w6
else ZYC<Wb)I
return previousIndex; 8F._9U-EN
} Q~Hy%M%R3
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} C=eF.FB;'
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抽象业务类 oH_;4QU4y
java代码: rx] @A
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/** 6_FE 4RR[
* Created on 2005-7-12 3f,hw5R
*/ g*_cPU0~m
package com.javaeye.common.business; )c)vTZy
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import java.io.Serializable; zzX_q(:S
import java.util.List; k7T`bYv
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import org.hibernate.Criteria; ~vyf4TF<#
import org.hibernate.HibernateException; ]@phF _
import org.hibernate.Session; (jAg_$6
import org.hibernate.criterion.DetachedCriteria; 'h,VR=e<
import org.hibernate.criterion.Projections; ~XOTs
import K1M%!JKh)x
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org.springframework.orm.hibernate3.HibernateCallback; ~5}*
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import $7^o#2
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org.springframework.orm.hibernate3.support.HibernateDaoS kZmpu?P
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upport; !WQ-=0cm
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import com.javaeye.common.util.PaginationSupport; @eKec1<
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public abstract class AbstractManager extends mc? Vq
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HibernateDaoSupport { lww!-(<ww
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privateboolean cacheQueries = false; fof TP1
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privateString queryCacheRegion; "hH.#5j
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publicvoid setCacheQueries(boolean
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cacheQueries){ !
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this.cacheQueries = cacheQueries; 5YeM%%-S
} R6;=n"Ueb
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publicvoid setQueryCacheRegion(String M_/7D|xl/T
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queryCacheRegion){ (X\@t-8
this.queryCacheRegion = <lx+/o
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queryCacheRegion; jaII r06
} YNKHN2E8
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publicvoid save(finalObject entity){ D9^h;
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getHibernateTemplate().save(entity); 96( v
} )rxX+k+b/
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publicvoid persist(finalObject entity){ 4'/nax$Bx;
getHibernateTemplate().save(entity); ]%@M>?Ywc
} v_+{'F
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publicvoid update(finalObject entity){ jnO9j_CY
getHibernateTemplate().update(entity); AG`L64B
} Y!-M_v /
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publicvoid delete(finalObject entity){ naG=Pq<
getHibernateTemplate().delete(entity); LM~[@_j
} 4gI/!,J(b
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publicObject load(finalClass entity, j4gF;-m<
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finalSerializable id){ +"\sc;6m.
return getHibernateTemplate().load N)uSG&S:
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(entity, id); x9UX!Z5*>
} CGW.I$u
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publicObject get(finalClass entity, Q{s H3Y#l
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finalSerializable id){ {Z(h.de
return getHibernateTemplate().get }aa'\8
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(entity, id); H%qsjB^
} T"{>t
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publicList findAll(finalClass entity){ : %lTU
return getHibernateTemplate().find("from zGb|) A~,
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" + entity.getName()); ePOG}k($/%
} <T` 7%$/E
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publicList findByNamedQuery(finalString *>Ns_su7W
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namedQuery){ j$M h+5
return getHibernateTemplate QyEnpZ8?a
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().findByNamedQuery(namedQuery); )tC5Hijq,
} ? ^0:3$La
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publicList findByNamedQuery(finalString query, G?L HmTHg
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finalObject parameter){ k0OYJ/
return getHibernateTemplate u(z$fG:g
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().findByNamedQuery(query, parameter); {c6=<Kv
} Ot4 Z{mA
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publicList findByNamedQuery(finalString query, , Rk9N
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finalObject[] parameters){ 0!4Ts3qn1
return getHibernateTemplate &W|[r(
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().findByNamedQuery(query, parameters); +5w))9@
}
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publicList find(finalString query){ .T}Wdng
return getHibernateTemplate().find DBo%fYst
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(query); X2#2C/6#u
} @3>u@
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publicList find(finalString query, finalObject j
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parameter){ [8Y:65
return getHibernateTemplate().find G~F b
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(query, parameter); i[O& )N,c
} R"-mKT}
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public PaginationSupport findPageByCriteria .UQzPnK
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(final DetachedCriteria detachedCriteria){ `"Jj1O@
return findPageByCriteria JYMiLph<
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); :,3C 0T3r
} 6O7'!@@
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public PaginationSupport findPageByCriteria h}>"j%I
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(final DetachedCriteria detachedCriteria, finalint Yz'K]M_Dq
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startIndex){ ])[[ V!1
return findPageByCriteria t=BUN
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(detachedCriteria, PaginationSupport.PAGESIZE, #%pI(,o=
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startIndex); _F4Ii-6
} R6 y#S&]x
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public PaginationSupport findPageByCriteria *1ilkmL%
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(final DetachedCriteria detachedCriteria, finalint y|jl[pyg)
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pageSize,
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finalint startIndex){ NyaQI<5D
return(PaginationSupport) t0( A4E
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getHibernateTemplate().execute(new HibernateCallback(){ Yc`o5Q\>
publicObject doInHibernate 6{@w="VT
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(Session session)throws HibernateException { Hf%@3X
Criteria criteria = oro$wFxJO
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detachedCriteria.getExecutableCriteria(session); kPKB|kP\
int totalCount = L{#IT.
7dN*lks
((Integer) criteria.setProjection(Projections.rowCount <h!_>:2L
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()).uniqueResult()).intValue(); zU,9T
criteria.setProjection Ij 79~pn
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(null); ,D5cjaX<
List items = gGR"Z]DBk
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criteria.setFirstResult(startIndex).setMaxResults 9,c(ysv"
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(pageSize).list(); u6J8"<
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PaginationSupport ps = j SHk{T!J
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new PaginationSupport(items, totalCount, pageSize, [Hx0`Nc K
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startIndex); *}Xf!"I#]N
return ps; bes<qy
} pLl(iNf]
}, true); yyR0]NzYUD
} O6@j &*jS
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public List findAllByCriteria(final J f@H/luW
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DetachedCriteria detachedCriteria){ .Q<>-3\K
return(List) getHibernateTemplate 1kz\IQ{
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().execute(new HibernateCallback(){ m.hkbet/R
publicObject doInHibernate
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},uF4M.K
(Session session)throws HibernateException { zh%#Y_[R
Criteria criteria = fAF1"4f
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detachedCriteria.getExecutableCriteria(session); 65L6:}#
return criteria.list(); eFipIn)b
} MlcR"gl*
}, true); Y&`=jDI
} ky8_UnaO
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public int getCountByCriteria(final iyN:%ofh
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DetachedCriteria detachedCriteria){ ,y1PbA0m
Integer count = (Integer) `Nv=B1
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getHibernateTemplate().execute(new HibernateCallback(){ 3s5z
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publicObject doInHibernate $yN{-T"
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(Session session)throws HibernateException { :1 ^LsLr5
Criteria criteria = Uq[>_"}
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detachedCriteria.getExecutableCriteria(session); ``V"
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return oNr-Q& C,
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criteria.setProjection(Projections.rowCount aL*&r~`&e'
. kQkC:~9
()).uniqueResult(); b v G/|U
} >d*iD
}, true); .O74V~T
return count.intValue(); I*%-cA%l
} [V^WGW2oY
} t,QyfN
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用户在web层构造查询条件detachedCriteria,和可选的 #G.ulX
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 B,<da1(a
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PaginationSupport的实例ps。 5"^en# ?9
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ps.getItems()得到已分页好的结果集 'GB.UKlR
ps.getIndexes()得到分页索引的数组 8hXl%{6d3
ps.getTotalCount()得到总结果数 ,eOB(?Ku
ps.getStartIndex()当前分页索引 `lQ3C{}
ps.getNextIndex()下一页索引 LyZ.l*h%=m
ps.getPreviousIndex()上一页索引 ?<V?wsp
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ?/BqD;{?I
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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 .>CPRVuVI
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一下代码重构了。 )+l\w3^6
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我把原本我的做法也提供出来供大家讨论吧: rv&<{@AS~
D6%J\C13`
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: mX_a^_[G
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/*Created on 2005-4-14*/ @<&5J7fb
package org.flyware.util.page; #,,d>e
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/** J]v%q,"
* @author Joa [p{#XwN
* %JXE5l+pJ
*/ w,w{/T+B
publicclass Page { {wO3<9
_]yn"p
/** imply if the page has previous page */ lV`Q{bd+
privateboolean hasPrePage; +,2:g}5
'd.EC#
/** imply if the page has next page */ ]+(6,ct&.
privateboolean hasNextPage; G;&-\0>W
'h/C oTk@,
/** the number of every page */ +g` 'J$
privateint everyPage; .uuO>:
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/** the total page number */ 3|WWo1
privateint totalPage; C
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&S( .GdEf
/** the number of current page */ .$Ik`[+Z
privateint currentPage; TcIcS]w%
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/** the begin index of the records by the current {. 2k6_1[
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query */ >=RmGS
privateint beginIndex; T.@aep\"
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>_o}
/** The default constructor */ )=5ng-
public Page(){ LO
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} ;u;# g
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/** construct the page by everyPage <<(wa
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* @param everyPage <%maDM^_\(
* */ j<u@j+V
public Page(int everyPage){ 3|1ilP
this.everyPage = everyPage; ]Bm/eRy"
} IqC]! H0
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/** The whole constructor */ 0|$v-`P$
public Page(boolean hasPrePage, boolean hasNextPage, v'VD0+3[H
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'f[T&o&L/
int everyPage, int totalPage, VCn{mp*h
int currentPage, int beginIndex){ : y5<go8e
this.hasPrePage = hasPrePage; }*lUah,@
this.hasNextPage = hasNextPage; ROk5]b.
this.everyPage = everyPage; nx8a$vI-TY
this.totalPage = totalPage; {jYOsl
this.currentPage = currentPage; !OA]s%u
this.beginIndex = beginIndex; kB'Fkqwm
} x/;bu W-
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/** R,F[XI+=N
* @return 89\n;5'f4
* Returns the beginIndex. 3
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*/ #bl6sa{E
publicint getBeginIndex(){ O+?<h{"
return beginIndex; &e;=cAXG
} O)ME"@r@:
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/** XVKfl3'%
* @param beginIndex Q(<)KZIK
* The beginIndex to set. &jsVw)Ue
*/ jFA{+Yr1
publicvoid setBeginIndex(int beginIndex){ 5e$~)fL
this.beginIndex = beginIndex; Y}uCP1v
} E-I-0h2
-PS#Z0>
/** <Wp
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* @return $)RNKMZC}A
* Returns the currentPage. (N&lHLy
*/ (*oL+ef-C
publicint getCurrentPage(){ mnmP<<8C,
return currentPage; o(S{VGi,
} P@,nA41,j
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/** &|!7Z4N
* @param currentPage
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p
* The currentPage to set. PB#fP_0C
*/ \ gLHi~
publicvoid setCurrentPage(int currentPage){ czm&~n6$
this.currentPage = currentPage; Sqo
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} qUxRM_7U
nWMmna.5
/** `67[O4$<
* @return Hd,p!_
* Returns the everyPage. Db6om7N
*/ 'Er:a?88l
publicint getEveryPage(){ [o.B
return everyPage; oiX+l5`pz
}
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/** * 1Od-3
* @param everyPage
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* The everyPage to set. 8HR mQ
*/ (s{RnD
publicvoid setEveryPage(int everyPage){ Oi:<~E[kz.
this.everyPage = everyPage; j%y$_9a7
} KyzFnVH3)
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/** *X4PM\ck
* @return r\blyWi
* Returns the hasNextPage. lhtZaU~V
*/ kdn'6>\
publicboolean getHasNextPage(){ 6<$Odd
return hasNextPage; z^GDJddG
} cKn`/\.H
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/** r" K':O6y
* @param hasNextPage XXh6^@H=
* The hasNextPage to set. E=cwq"
*/ MdXchO-Lyc
publicvoid setHasNextPage(boolean hasNextPage){ 3;8!rNN
this.hasNextPage = hasNextPage; %/>Y/!;
} [p2H=
j~FD{%4N
/** bO&7-Z~:=
* @return in(U:04
* Returns the hasPrePage. RGK8'i/X
*/ 0d3+0EN{
publicboolean getHasPrePage(){ \'M3|w`f
return hasPrePage; kFQ8
y~>y}
} JkGnKm9G
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/** Nr0
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* @param hasPrePage CT\;xt,S
* The hasPrePage to set. 4<x'ocKlD
*/ /l{&iLz[
publicvoid setHasPrePage(boolean hasPrePage){ HXoX
this.hasPrePage = hasPrePage; #BQ.R,
} (D
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g/&T[FOr
/** /5#rADOS
* @return Returns the totalPage. 5BR2?hO4
* 8&Myva
*/ *#TYqCc+g
publicint getTotalPage(){ k64."*X
return totalPage; DaH?@Q
} S=xA[%5
.7
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/** z`Hy'{1
* @param totalPage ex<O]kPFE
* The totalPage to set. TyKWy0x-3
*/ St<mDTi
publicvoid setTotalPage(int totalPage){ o0ZM[0@j
this.totalPage = totalPage; WsFk:h'r
} i%{3W:!4t
$O{duJU
} z`6fotL
CdUAy|!`R
2Sq_Tw3^
'&99?s`u
w0ZLcND{
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 `+#G+Vu5
/cK%n4l.y
个PageUtil,负责对Page对象进行构造: %hN.ktZ/s
java代码: GdVhK:<>
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/*Created on 2005-4-14*/ NWfAxkz{/
package org.flyware.util.page; ^>?CMcN4*
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import org.apache.commons.logging.Log; s!+"yK
import org.apache.commons.logging.LogFactory; K\^ 0_F K
jEz+1Nl)
/** iU+nqY'
* @author Joa dJ:MjQG`W
* =op%8NJf
*/ (]*H[)F/
publicclass PageUtil { *[eL~oN.c
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privatestaticfinal Log logger = LogFactory.getLog f&4,?E;6%
/Jf~25F
(PageUtil.class); rC_*sx
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/** K~RoUE<3[
* Use the origin page to create a new page Y`6rEA0
* @param page qP!P
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* @param totalRecords ~Cc.cce5
* @return 1\L[i];L8
*/ ?@6/Alk
publicstatic Page createPage(Page page, int @OV-KT[>
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totalRecords){ W2-=U@
return createPage(page.getEveryPage(), Oq(VvS/
*pzq.#
page.getCurrentPage(), totalRecords); "k$JP
} 9H]_4?aX
5wC* ?>/
/** rAQF9O[
* the basic page utils not including exception p3^jGj@
n
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handler 3UUGblg`~
* @param everyPage ']ood!
* @param currentPage t>UkE9=3\
* @param totalRecords ('o&Q_
* @return page T>]sQPg
*/ t)1phg4H)
publicstatic Page createPage(int everyPage, int JSMPyj
h%#_~IA:|
currentPage, int totalRecords){ f_r0})
everyPage = getEveryPage(everyPage); \x\.
currentPage = getCurrentPage(currentPage); uVU`tDzd:
int beginIndex = getBeginIndex(everyPage, udqge?Tz
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currentPage); CUmH,`hu
int totalPage = getTotalPage(everyPage, +QqH}=
M
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totalRecords); @]
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boolean hasNextPage = hasNextPage(currentPage, -]"T^wib
2g`[u|
totalPage); ~5#)N{GbY
boolean hasPrePage = hasPrePage(currentPage); ?s{C//
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returnnew Page(hasPrePage, hasNextPage, 9k2,3It
everyPage, totalPage, <DiOWi
currentPage, .5hp0L}
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beginIndex); M23&<}Q8
} {K.rl%_|N
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privatestaticint getEveryPage(int everyPage){ 2)LX^?7R
return everyPage == 0 ? 10 : everyPage; /(6zsq'v|
} }ymvC
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privatestaticint getCurrentPage(int currentPage){ =Lw3
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return currentPage == 0 ? 1 : currentPage; 3XVk#)lw
} a?<?5
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privatestaticint getBeginIndex(int everyPage, int j=3-Qk`"/|
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currentPage){ %jKH?%Ih
return(currentPage - 1) * everyPage; U~QMR-bz
} 23E0~O
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privatestaticint getTotalPage(int everyPage, int =:5<{J OG
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totalRecords){ APHPN:v
int totalPage = 0; h(:<(o@<
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if(totalRecords % everyPage == 0) D!l8l49hLu
totalPage = totalRecords / everyPage; g,?\~8-c
else !k h{9I>M
totalPage = totalRecords / everyPage + 1 ; Qb@eK$wo}
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return totalPage; fA
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} [@.B4p
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privatestaticboolean hasPrePage(int currentPage){ %]jQ48^R
return currentPage == 1 ? false : true; -Cj_B\
} .Vh*Z<9S4
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privatestaticboolean hasNextPage(int currentPage, IA4+ad'\E
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int totalPage){ 9t}xXk
return currentPage == totalPage || totalPage == 3}4#I_<$F@
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0 ? false : true; uX0
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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。 C9Wojo.
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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 (w2(qT&