Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 j Ja$a [
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 FYs)MO
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 xw{-9k-~
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 -(#I3h;I
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分页支持类: YV=QF
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java代码: *5bLe'^\|K
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package com.javaeye.common.util; Z*G(5SqUh"
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import java.util.List; [c_|ob]
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publicclass PaginationSupport { (}. @b|s
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publicfinalstaticint PAGESIZE = 30; <2C7<7{7
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privateint pageSize = PAGESIZE; |t$Ma'P
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privateList items; 0G!]=
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privateint totalCount; hdTzCfeZ5@
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privateint[] indexes = newint[0]; cj11S>D
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privateint startIndex = 0; >#ZUfm{k$
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public PaginationSupport(List items, int ;lYHQQd!,
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totalCount){ d[rv1s>i
setPageSize(PAGESIZE); a >\vUv*
setTotalCount(totalCount); Ym;*Y !~[
setItems(items); cqxVAzb
setStartIndex(0); UH7jP#W%=
} 8[6o (
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public PaginationSupport(List items, int Jk,;JQ
= k\J<
totalCount, int startIndex){ U]a*uF~h
setPageSize(PAGESIZE); !3T&4t
setTotalCount(totalCount); mf'V)
setItems(items); /VG2.:
setStartIndex(startIndex); A'P(a`
} Fl(T\-Eu
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public PaginationSupport(List items, int hy|b6wF&
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totalCount, int pageSize, int startIndex){ e<r,&U$
setPageSize(pageSize); F;^F+H
setTotalCount(totalCount); e%W$*f
setItems(items); yCCrK@{oo
setStartIndex(startIndex); "`N-* ;*W
} \W,I?Kx$
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publicList getItems(){ ^n0]dizB
return items; X$/2[o#g
} dH( ('u[
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publicvoid setItems(List items){ uslQ*7S[^
this.items = items; +}jJ&Z9)
} XrZ*1V
V)}rEX
publicint getPageSize(){ ;;&}5jcV
return pageSize; n_'{^6*O
} *hcYGLx
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publicvoid setPageSize(int pageSize){ m.,U:>
this.pageSize = pageSize; I!^O)4QRx
} fFQ|T:vm
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publicint getTotalCount(){ 6AocmR0D'
return totalCount; qWb+r
} =*Bl|;>6
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publicvoid setTotalCount(int totalCount){ )=Jk@yj8x
if(totalCount > 0){ y(
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this.totalCount = totalCount; ']+Uu'a
int count = totalCount / ?IpLf\n-
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pageSize; /Z7iLq~t"G
if(totalCount % pageSize > 0) }f2r!7:x
count++; U(x]O/m
indexes = newint[count]; jlxpt)0i
for(int i = 0; i < count; i++){ 2#k5+?-c61
indexes = pageSize * AlJ} >u
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i; u]OW8rc
} fDLG>rXPT
}else{ =FD;~
this.totalCount = 0; B5$kHM%p
} :,)lm.}]t
} <F04GO\
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publicint[] getIndexes(){ 4bgqg0z>
return indexes; J`2"KzR0w"
} )m. 4i =X
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publicvoid setIndexes(int[] indexes){ u(G*\<z-
this.indexes = indexes; vx4+QQYP
} mkR2i>
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publicint getStartIndex(){ Po%(~ )S>
return startIndex; \QB;Ja_
} O+ICol
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publicvoid setStartIndex(int startIndex){ U,LTVYrO
if(totalCount <= 0) 2PG [7u^
this.startIndex = 0; Sf8{h|71
elseif(startIndex >= totalCount) `jOX6_z?I
this.startIndex = indexes P~ &$l2
TiH)5
[indexes.length - 1]; b5^OQH{v
elseif(startIndex < 0) 4ni3kmvX
this.startIndex = 0; M+x,opl
else{ "!EcbR
this.startIndex = indexes Fgh]KQ/5
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[startIndex / pageSize]; b6*!ACY
} ]~Z6;
} 0#MqD[U(
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publicint getNextIndex(){ %'T #pz
int nextIndex = getStartIndex() + =)7s $
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pageSize; "]G\9b)
if(nextIndex >= totalCount) 9HX =T%
return getStartIndex(); 0P]E6hWgg
else x|vqNZ\F
return nextIndex; Z:_D0jG
} BGfzslK
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publicint getPreviousIndex(){ ZIF49`Y4TF
int previousIndex = getStartIndex() - }[xs~!2F
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pageSize; ?C/Te)
if(previousIndex < 0) [
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return0; QMZ)-ty"
else z0do;_x]E
return previousIndex; m1*O0Tg]"
} }m-FGk
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} -!
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抽象业务类 RH|XxH*
java代码: /g4f`$a
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/** } GiHjzsR
* Created on 2005-7-12 42qYg(tZ
*/ Ggb5K8D*
package com.javaeye.common.business; <=,6p>Eo[
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import java.io.Serializable; Kx%Sku<F'
import java.util.List; 2j&AiD
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import org.hibernate.Criteria; Nj 00W1
import org.hibernate.HibernateException; (V HL{rj
import org.hibernate.Session; >orK';r<
import org.hibernate.criterion.DetachedCriteria; ]i)j3WDz]
import org.hibernate.criterion.Projections; H_QsNf
import 5;{H&O9Q
@n": w2^B
org.springframework.orm.hibernate3.HibernateCallback; FeTL&$O
import A\.GV1
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org.springframework.orm.hibernate3.support.HibernateDaoS xagBORg+Bd
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upport; *~x/=.}
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import com.javaeye.common.util.PaginationSupport; PKzyV ;
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public abstract class AbstractManager extends J`^I./
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HibernateDaoSupport { }O4^Cc6
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privateboolean cacheQueries = false; fP `b>]N_
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privateString queryCacheRegion; I'0@viF"Nx
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publicvoid setCacheQueries(boolean IyLx0[:U
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cacheQueries){ UCClWr
this.cacheQueries = cacheQueries; Z LD}a:s
} dB5b@9*
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publicvoid setQueryCacheRegion(String bAm(8nT7w
}7.PH'.8
queryCacheRegion){ ;y2/-tL?
this.queryCacheRegion = d:U9pC$
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queryCacheRegion; GHeVp/u
} `WH"%V:"Q
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publicvoid save(finalObject entity){ k'5?M
getHibernateTemplate().save(entity); ksN+?E4w
} UQI]>#_/v
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publicvoid persist(finalObject entity){ byfJy^8G
getHibernateTemplate().save(entity); iS<I0\D
}
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publicvoid update(finalObject entity){ IDG}ZlG
getHibernateTemplate().update(entity); \9g+^vQg
} 1cD! :[
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publicvoid delete(finalObject entity){ 6 jn3`D
getHibernateTemplate().delete(entity); `6xkf&Kt
} @ >U-t{W
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publicObject load(finalClass entity, N
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finalSerializable id){ Oal3rb
return getHibernateTemplate().load *=*AAF
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(entity, id); /Bm( `T
} D'Y-6W3
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publicObject get(finalClass entity, ]f({`&K5
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finalSerializable id){ 0ok-IHE<
return getHibernateTemplate().get vTx2E6
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(entity, id); -xA2pYz"
} T]=r Co
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publicList findAll(finalClass entity){ HEM9E&rL
return getHibernateTemplate().find("from vG"=h%
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" + entity.getName()); lH6OcD:kj
} [6XF=L,!
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publicList findByNamedQuery(finalString L>RP-x>
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namedQuery){ u2?|Ue@[
return getHibernateTemplate 0p!>JQ]m
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().findByNamedQuery(namedQuery); &H`jL4S
} *5^Q7``
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publicList findByNamedQuery(finalString query, d5gR"ja
{*I``T_+
finalObject parameter){ ?qWfup\S
return getHibernateTemplate @6]sNm
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().findByNamedQuery(query, parameter); j?x>_#tIY
} J.xPv)1'
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publicList findByNamedQuery(finalString query, #/<&*Pu5t
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finalObject[] parameters){ /q`xCS
return getHibernateTemplate 0p}D(m2B
2
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().findByNamedQuery(query, parameters); YLzx<~E4a
} 2-Ej4I~
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publicList find(finalString query){ jGpN,/VQa
return getHibernateTemplate().find Tw;3_Lj
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(query); 9E>|=d|(d
} xY^%&n
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publicList find(finalString query, finalObject 2bkX}FWd;
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parameter){ "q.\>MCv
return getHibernateTemplate().find J2xw) +
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(query, parameter); [Q/TlO t5
} ov_j4j>6P
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public PaginationSupport findPageByCriteria )E-inHD /
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(final DetachedCriteria detachedCriteria){ Pu*6"}#~
return findPageByCriteria lY?QQ01D
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); < v@9#c
} q$B>|y U
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public PaginationSupport findPageByCriteria y+c|vdW%
{_ i\f ]L
(final DetachedCriteria detachedCriteria, finalint Kk-S}.E
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startIndex){ iiS-9>]/
return findPageByCriteria ]);%wy{Ho
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(detachedCriteria, PaginationSupport.PAGESIZE, Vt".%d/`7
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startIndex); ~l]ve,W[
} {pnS Q
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public PaginationSupport findPageByCriteria { +
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(final DetachedCriteria detachedCriteria, finalint '+?"iVVo
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pageSize, j/f?"VEr
finalint startIndex){ [d1mLJAR
return(PaginationSupport) &h^9}>rVjV
"NXB$a!:
getHibernateTemplate().execute(new HibernateCallback(){ IDB+%xl#S
publicObject doInHibernate 2ZG5<"DQ"
[f1
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(Session session)throws HibernateException { oPXkYW
Criteria criteria = o:3dfO%nuM
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detachedCriteria.getExecutableCriteria(session); }dWq=)*
int totalCount = o7sT=x9
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((Integer) criteria.setProjection(Projections.rowCount }NzpiY9
,^w?6?,&l}
()).uniqueResult()).intValue(); iw8yb;|z;A
criteria.setProjection UBaAx21x
0 yuW*z
(null); <b`E_
List items = rA5=dJ"I
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criteria.setFirstResult(startIndex).setMaxResults X.f>'0i
(`c
[#0=n
(pageSize).list(); b\$}>O
PaginationSupport ps = smRE!f*q
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new PaginationSupport(items, totalCount, pageSize, %.^_Ps0
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startIndex); zMm#Rhn
return ps; d%RC
} |
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}, true); rvbLyv;~
} @|63K)Xy
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public List findAllByCriteria(final R`DKu=
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DetachedCriteria detachedCriteria){ u'|4?"uz
return(List) getHibernateTemplate ||hb~%JK6
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().execute(new HibernateCallback(){ \{Z;:,S
publicObject doInHibernate pb
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]*
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(Session session)throws HibernateException { ?'@8kpb
Criteria criteria = 5q;GIw^L
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detachedCriteria.getExecutableCriteria(session); X(]WVCu
return criteria.list(); _wkVwPr
} kb{]>3Y"
}, true); %l}D. ml
} sk,ox~0R
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public int getCountByCriteria(final g`vny )\7/
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DetachedCriteria detachedCriteria){ *W0y: 3dB3
Integer count = (Integer) kI
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getHibernateTemplate().execute(new HibernateCallback(){ bx{$Y_L+p
publicObject doInHibernate w)kNkD
@eD):Y
(Session session)throws HibernateException { tD(7^GuR
Criteria criteria = VY;{/.Sa
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detachedCriteria.getExecutableCriteria(session); h|VeG3H
return 1zm ulj%&
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criteria.setProjection(Projections.rowCount XC0bI,Fu,
'IZI:V"
()).uniqueResult(); #A1Z'y0
} %Y<| ;0v
}, true); R?~Yp?B^
return count.intValue(); )0"wB
} ,2j&ko1
} ;aI[=?<x
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用户在web层构造查询条件detachedCriteria,和可选的 lef2 X1w}!
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 KIui(n#/
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PaginationSupport的实例ps。 t2F_uCr
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ps.getItems()得到已分页好的结果集 6x h:/j3
ps.getIndexes()得到分页索引的数组 xy5lE+E_U
ps.getTotalCount()得到总结果数 <tF9V Jq
ps.getStartIndex()当前分页索引 a`&f
ps.getNextIndex()下一页索引 96 q_K84K
ps.getPreviousIndex()上一页索引 0E,8R{e
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 u<3HQ.:;
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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 U1DXeh~V
lD^]\;?
一下代码重构了。 =yr0bGy`-
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我把原本我的做法也提供出来供大家讨论吧: A'q#I>j`
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首先,为了实现分页查询,我封装了一个Page类: co~Pyj
java代码: :=/85\P0SU
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/*Created on 2005-4-14*/ ?ooe'V@
package org.flyware.util.page; |uqf:V`z:
#w,Dwy
/** 0vEoGgY0*:
* @author Joa vy0X_DPCr
* ?]Pmxp
H}
*/ CN#+U,NZV
publicclass Page { lsNrAA%m
{;N,t]>8M
/** imply if the page has previous page */ ]l1\? I
privateboolean hasPrePage; a:"Uh**
^* J2'X38I
/** imply if the page has next page */ S0~2{G"v
privateboolean hasNextPage; =NnNN'}
m@"QDMHk.
/** the number of every page */ D2](da:]8)
privateint everyPage; zo +nq%=
[q/Abz'i
/** the total page number */ H<v'^*(
privateint totalPage; rqdE6y+^
kSR\RuY*
/** the number of current page */ 8Eakif0CO
privateint currentPage; IhA5Wt0j
12;8o<~
/** the begin index of the records by the current 2_n7=&
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query */ o_@4Sl8
privateint beginIndex; n#q<`}u,
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/** The default constructor */ [z9`)VIe
public Page(){ "}pNe"ok
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} y.WEj?EL
nQ q=7Gu
/** construct the page by everyPage @2Z#x
* @param everyPage i\KQ!f>A
* */ .2%zC & ;
public Page(int everyPage){ jUSmqm'
this.everyPage = everyPage; Y( 3Bp\6
} 99:C"`E{
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/** The whole constructor */ *a58ZI@
public Page(boolean hasPrePage, boolean hasNextPage, k p<OJy
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int everyPage, int totalPage, -i)ZQCE
int currentPage, int beginIndex){ ny`#%Vs
this.hasPrePage = hasPrePage; q:dHC,fO
this.hasNextPage = hasNextPage; t.laO. 3
this.everyPage = everyPage; /9HVY
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this.totalPage = totalPage; k Mu8"Az
this.currentPage = currentPage; *^f<W6xc
this.beginIndex = beginIndex; lTd #bN
} U<CTubF
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/** 7g%E`3)"
* @return Z?%zgqTXb
* Returns the beginIndex. `&D|>tiz
*/ (vb
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publicint getBeginIndex(){ }oL'8-y
return beginIndex; ~ ip,Nl
} S-k8jm
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/** '7+4`E
* @param beginIndex nq6@6GRG
* The beginIndex to set. QlJ)F{R8il
*/ ~NQ72wph{
publicvoid setBeginIndex(int beginIndex){ x n5l0'2
this.beginIndex = beginIndex; /Y'Vh^9/T
} AQ_|:
eu(:`uu
/** +tVaBhd!
* @return So0f)`A
* Returns the currentPage. kdl:Wt*4o
*/ 5<UVD:~z
publicint getCurrentPage(){ s (zL
return currentPage; gREzZ+([
} my}-s
:P<]+\m
/** <4P4u*/o
* @param currentPage w)Q0_2p.
* The currentPage to set. Vl:^>jTki
*/ D'J0wT#
publicvoid setCurrentPage(int currentPage){ CbwJd5tk
this.currentPage = currentPage; -F<Wd/Xse
} ](&{:>RNJ
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/** |h;0H`
* @return ;~D)~=|ZZ
* Returns the everyPage. ly:q6i
*/ n2oz"<?$S
publicint getEveryPage(){ K2J\awX
return everyPage; ~},=OF-b
}
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h"_MA_]~
/** dHv68*^\'
* @param everyPage BDR.AZ
* The everyPage to set.
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*/ 3?1`D/
publicvoid setEveryPage(int everyPage){ ;*:Pw?'
this.everyPage = everyPage; R'C2o]
} eD*A)
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/** MM(xk
* @return X4 A<[&F/
* Returns the hasNextPage. q U]gj@R
*/ kzt(i Y_6
publicboolean getHasNextPage(){ MP!d4
return hasNextPage; PX<J&rx
} a=hxJ1O
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/** "
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* @param hasNextPage 80Gn%1A9
* The hasNextPage to set. g7OqX \
*/ gK[YQXfTy
publicvoid setHasNextPage(boolean hasNextPage){ @te!Jgu{
this.hasNextPage = hasNextPage; >_|O1H./4
} EUN81F?
$shoasSuI
/** :9^;Qv*
* @return &(xH$htv1
* Returns the hasPrePage. i 7x7xtq
*/ L{h%f4Du#
publicboolean getHasPrePage(){ A29gz:F(
return hasPrePage; |j#C|V%kV
} 1 D<_N
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/** .HkL2m
* @param hasPrePage ?TU }~}
* The hasPrePage to set. t.`@{R$hoA
*/ 9J9)AV
publicvoid setHasPrePage(boolean hasPrePage){ fjs
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this.hasPrePage = hasPrePage; f"qga/
} 6WU(%
!f&Kf,#b`
/** :=wTvz
* @return Returns the totalPage. }j*KcB_
* N6 (
*/ h-Fn?
publicint getTotalPage(){ >(?9?
return totalPage; p;tVn{u
} mR}6r2O2\Q
3td)'}
/** ]dI2y=[!C
* @param totalPage w8Sp<6*
* The totalPage to set. =
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*/ *:L?#Bw
publicvoid setTotalPage(int totalPage){ E}40oID
this.totalPage = totalPage; /4`
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} YwZ
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} ?q;Fp
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S5G6Rj@W
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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 ;K!]4tfJ
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个PageUtil,负责对Page对象进行构造: +YqZ((
java代码:
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6y6<JR-V2k
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/*Created on 2005-4-14*/ DsT>3
package org.flyware.util.page; ,]+z)
\hM|(*DL
import org.apache.commons.logging.Log; Bc6|n :;u
import org.apache.commons.logging.LogFactory; }RwSp!}C
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/** DR c)iE>@
* @author Joa ; =X P &
* yjhf
*/ ,)iKH]lY=
publicclass PageUtil { $aN&nhoO<
21< j\
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privatestaticfinal Log logger = LogFactory.getLog U` Wauv&
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(PageUtil.class);
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/** TJ1+g
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* Use the origin page to create a new page M
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* @param page .8P.)%
* @param totalRecords p TeOW9
* @return K00
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*/ Zxbo^W[[
publicstatic Page createPage(Page page, int #1c_ev H
H
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totalRecords){ *{yK
8
return createPage(page.getEveryPage(), {6~l$
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page.getCurrentPage(), totalRecords); sfOHarww
} #3_*]8K.R
XwlbJ=mf
/** T`Mf]s)*
* the basic page utils not including exception JXu$ew>q
w\DVzeW(
handler pGK;1gVj
* @param everyPage &&VqD
w
* @param currentPage yb/%?DNQT
* @param totalRecords rwG CUo6Z
* @return page 86\S?=J-b
*/ U)o$WH.b
publicstatic Page createPage(int everyPage, int I;Bjfv5
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currentPage, int totalRecords){ x
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everyPage = getEveryPage(everyPage); JM\m)RH0
currentPage = getCurrentPage(currentPage); r%.do;5
int beginIndex = getBeginIndex(everyPage, sRrzp=D
9M1d%jT
currentPage); "sl1vzRN
int totalPage = getTotalPage(everyPage, ]@0NO;bK>F
:P@rkT3Q t
totalRecords);
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boolean hasNextPage = hasNextPage(currentPage, *0>mB
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totalPage); ?HV`|
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boolean hasPrePage = hasPrePage(currentPage); X_g 3rv1J
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returnnew Page(hasPrePage, hasNextPage, EoxQ
*/
everyPage, totalPage, e&qh9mlE
currentPage, ^4`Px/&
=@8H"&y`
beginIndex); hQDTS>U
} i![dPM
(>I`{9x>6
privatestaticint getEveryPage(int everyPage){ l+g9 5mjP
return everyPage == 0 ? 10 : everyPage; pTyi!:g3W
} 3Bx:Ntx<
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privatestaticint getCurrentPage(int currentPage){ d GFGr}&s
return currentPage == 0 ? 1 : currentPage; T7d9ChU\#.
} &2=dNREJ}1
K.z64/H:
privatestaticint getBeginIndex(int everyPage, int ]Wq?H-B{
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currentPage){ !k/Pv\j/R
return(currentPage - 1) * everyPage; NM6Teu_
} P b]3&!a
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privatestaticint getTotalPage(int everyPage, int +5&wOgx
4|`Bq}sjZf
totalRecords){ W!"}E%zx
int totalPage = 0; MiRdX#+Y
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if(totalRecords % everyPage == 0) o)[2@fRC(
totalPage = totalRecords / everyPage; }oKG}wgY
else 3t0[^cY8=z
totalPage = totalRecords / everyPage + 1 ; $8'O
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return totalPage; "luR9l,RRE
} QlHd,w
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privatestaticboolean hasPrePage(int currentPage){ Zb134b'
return currentPage == 1 ? false : true; UD)e:G[Gat
} Q26qNn
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privatestaticboolean hasNextPage(int currentPage, F1Hh7
F
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int totalPage){ if]Noe
return currentPage == totalPage || totalPage == PT5AA8F
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0 ? false : true; gt7VxZ
} ]Bm>-*@0N
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} C^z\([k0er
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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。 \^V`ds*.
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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 fI7j):h;
JMS(9>+TA
做法如下: s-7RW
1. 编写一个通用的结果存储类Result,这个类包含一个Page对象 N*@aDM07
80$fG8
的信息,和一个结果集List: V`-vR2(
java代码: n?:=
3J=Y9 }
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/*Created on 2005-6-13*/ N|Sf=q?Ko
package com.adt.bo; <soz#}e
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import java.util.List; ~Wp Gf,
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import org.flyware.util.page.Page; N7s'6(`=X
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/** `+/H^
* @author Joa wO>L#"X^v
*/ !P$'#5mr
publicclass Result { (?*BB3b`
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private Page page; i#%a- I:M
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private List content; ?~QIALA
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/** t
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* The default constructor )*5G">) )p
*/ i0s6aAhgJ
public Result(){ 2nFy`|aA%
super(); 3<?XTv-
} G8I Y#
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/** Z.wA@ ~e
* The constructor using fields M@thI%lR
* 9 F^;!
* @param page b`_w])Y@
* @param content &VBd~4|p
*/ f2,1<^{
public Result(Page page, List content){ P=5NKg
this.page = page; SxjCwX">
this.content = content; ~=Ncp9ej#
} rz(0:vxwA
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/** K+T.o6+
* @return Returns the content. i%#$*
*/ =_[Z W
publicList getContent(){ ntP|\E
return content; w^1Fi8+
} R1-k3;v^
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/** )n=ARDd^e
* @return Returns the page. ?_`0G/xl
*/ 111D3
public Page getPage(){ $A}QY5`+~S
return page; !eJCM`cp
} ,5|d3dJS
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/** F8+e,x
* @param content s^T+5E&}
* The content to set. somfv$'B
*/ )uLr?$qe
public void setContent(List content){ 9B+wYJp
this.content = content; +/?iCmW
} s~},y]YV
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/** ^UA(HthY
* @param page ]Fb0Az
* The page to set. %TrF0{NR90
*/ $gMCR
b,
publicvoid setPage(Page page){ %So]3;'
this.page = page; Q&M'=+T
} Vj;
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} d \>2
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iS@\ =CK
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2. 编写业务逻辑接口,并实现它(UserManager, Ak~4|w-
;TZGC).6
UserManagerImpl) `dJDucD
java代码: V)D-pV V
I"xWw/Ec
,f:
jioY
/*Created on 2005-7-15*/ tiLu75vj
package com.adt.service; xfSG~csoz
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import net.sf.hibernate.HibernateException; i=v]:TOu
fY2wDD
import org.flyware.util.page.Page; |ZU#IQVQfn
9e<Zgr?N
import com.adt.bo.Result; ][Y^-Ak1
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/** )Mzt3u
* @author Joa d^39t4
*/ ]Qi,j#X
publicinterface UserManager { =:h3w#_c
R V!o4"\]
public Result listUser(Page page)throws Z{{t^+XG
`HUf v@5
HibernateException; S 2$5!(P
.#^0pv!
} xKp0r1}
L)-*,$#<oW
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java代码: ~4
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