Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 95]%j\
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 &\p:VF.
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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 g"Ii'JZ?
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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 =D[h0U
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分页支持类: N ZlJ_[\$C
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java代码: u|:VQzPd-
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package com.javaeye.common.util; 1~`gfHI4
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import java.util.List; vY;Lc
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publicclass PaginationSupport { ,}2j
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publicfinalstaticint PAGESIZE = 30; t#pY2!/T3
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privateint pageSize = PAGESIZE; zIAMM
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privateList items; rLKDeB
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privateint totalCount; (u'/tNGS
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privateint[] indexes = newint[0]; LB{a&I LG
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privateint startIndex = 0; 6nq.~f2`
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public PaginationSupport(List items, int =p7W^/c
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totalCount){ J2cNwhZ
setPageSize(PAGESIZE); $\K(EBi#G
setTotalCount(totalCount); /gdo~
setItems(items); $OhL
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setStartIndex(0); eD(a
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} "Q
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public PaginationSupport(List items, int # xoFIH
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totalCount, int startIndex){ mn4;$1~e>H
setPageSize(PAGESIZE); k m|wB4
setTotalCount(totalCount); $7bmUQ|
setItems(items); =lmh^**4
setStartIndex(startIndex); JR>B<{xB
} O71rLk;
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public PaginationSupport(List items, int e.kt]l
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totalCount, int pageSize, int startIndex){ v}mmY>M%
setPageSize(pageSize); 2bC%P})m
setTotalCount(totalCount); PJ.jgN(r
setItems(items); Z)&HqqT3p
setStartIndex(startIndex); a|53E<5X
} UCWU|r<s,
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publicList getItems(){ k %rP*b*
return items; A3$b_i @P
} n%0vQ;Z1
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publicvoid setItems(List items){ !Yf0y;e|:
this.items = items; l85"C
} w#$k$T)
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publicint getPageSize(){ ~S6N'$^
return pageSize; CYu8J@(\~g
} eC39C2q\
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publicvoid setPageSize(int pageSize){ R{B~No w3
this.pageSize = pageSize; 8UcT?Zp
} |Wgab5D>V
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publicint getTotalCount(){ ]rm=F]W/n
return totalCount; 1mV0AE538
} 6;*(6$;
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publicvoid setTotalCount(int totalCount){
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if(totalCount > 0){ E;Hjw0M'k
this.totalCount = totalCount; {cI<4><
int count = totalCount / J)->
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pageSize; u5ygbCm
if(totalCount % pageSize > 0) ~k(Ez pn#
count++; iy"Kg]
indexes = newint[count]; 'W*F[U*&HP
for(int i = 0; i < count; i++){ zE/(F;> FV
indexes = pageSize * J"MJVMo$T
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} ?rDwYG(u]@
}else{ a40BisrD~6
this.totalCount = 0; xL"%2nf
} F)w83[5_d
} 8IH gsW";
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publicint[] getIndexes(){ "U.=A7r
return indexes; AF}"
} *ZGN!0/
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publicvoid setIndexes(int[] indexes){ ~dLZ[6Z
this.indexes = indexes; nSiNSLv
} ZM?r1Z4
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publicint getStartIndex(){ v],DBw9
return startIndex; >cb
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} WXU6J?tIm
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publicvoid setStartIndex(int startIndex){ TbVL71c
if(totalCount <= 0) ^'4uTbxP_!
this.startIndex = 0; QEKFuY<E+
elseif(startIndex >= totalCount) bl<7[J.
this.startIndex = indexes z;fSd
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[indexes.length - 1]; ^ym{DSx
elseif(startIndex < 0) ^aCYh[=
this.startIndex = 0; gi>_>zStv
else{ aO%FQ)BT
this.startIndex = indexes !y?hn$w0
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[startIndex / pageSize]; zOdKB2_J7
} ZtoE=7K
} du,-]fF
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publicint getNextIndex(){ ?<QFW#:)
int nextIndex = getStartIndex() + BaAb4{
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pageSize; '=.Uz3D'0
if(nextIndex >= totalCount) JUFO.m^w
return getStartIndex(); Q8oo5vqQ#C
else ~7a BeD
return nextIndex; &7&*As
} cx(F,?SbS
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publicint getPreviousIndex(){ ""^BW Re D
int previousIndex = getStartIndex() - oZ[ w
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pageSize; pe})A
if(previousIndex < 0) Q{hOn]"
return0; n0pe7/Ai
else VAE?={-
return previousIndex; x^2/jUc#B
} `h!&->
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} Y{|yB
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抽象业务类 _ n4ma
java代码: F@bCm+z-
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/** i6 ?JX@I
* Created on 2005-7-12 5q`)jd !*)
*/ ]?$y}
package com.javaeye.common.business; Aq'E:/
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import java.io.Serializable; d}cJ5!d
import java.util.List; ldvxYq<:
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import org.hibernate.Criteria; Jjh!/pWZ4
import org.hibernate.HibernateException; &"%|`gE
import org.hibernate.Session; 6G$tYfX
import org.hibernate.criterion.DetachedCriteria; H)aC'M^
import org.hibernate.criterion.Projections; @zF:{=+]+
import u!k<sd_8B
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org.springframework.orm.hibernate3.HibernateCallback; `1<3Hu_
import ,ri--<
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org.springframework.orm.hibernate3.support.HibernateDaoS 8z8SwWS?
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upport; A;a(n\Sy
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import com.javaeye.common.util.PaginationSupport; C,vc
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public abstract class AbstractManager extends "sX?wTag
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HibernateDaoSupport { >1pH 91c'
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privateboolean cacheQueries = false; @<yc .>
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privateString queryCacheRegion; 6ilC#yyp
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publicvoid setCacheQueries(boolean Mv`L F
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cacheQueries){ vP)~j1
this.cacheQueries = cacheQueries; cYy@
} lT!$\E$1
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publicvoid setQueryCacheRegion(String :fKz^@mY4
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queryCacheRegion){ q.sQ Z]ty9
this.queryCacheRegion = Bp{`%86SE
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queryCacheRegion; +Z~!n
} TIWLp
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publicvoid save(finalObject entity){ o]jP3
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getHibernateTemplate().save(entity); IetGg{h.
} VD&3%G!
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publicvoid persist(finalObject entity){ S@zkoj@
getHibernateTemplate().save(entity); v:Z4z6M-
} N?{1'=Om
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publicvoid update(finalObject entity){ +y4AUU:Q
getHibernateTemplate().update(entity); 1
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} .C;_4jE
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publicvoid delete(finalObject entity){ JrWBcp:Y
getHibernateTemplate().delete(entity); jo3}]KC !
} B"Kce"!
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publicObject load(finalClass entity, zMr!WoW
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finalSerializable id){ hd
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return getHibernateTemplate().load ck_fEF
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(entity, id); qM!f
} xm,`4WdG
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publicObject get(finalClass entity, [H:GKhPC`
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finalSerializable id){ hB}h-i(u
return getHibernateTemplate().get R~5*#r@f
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(entity, id); ]\ 2RVDC
} (p.3'j(
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publicList findAll(finalClass entity){ {+6D-rDw
return getHibernateTemplate().find("from SM /ykk
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" + entity.getName()); $FusDdCv3
} 'Ywpdzz[
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publicList findByNamedQuery(finalString "(\)
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namedQuery){ 4,F3@m:<
return getHibernateTemplate Cq*}b4^;
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().findByNamedQuery(namedQuery); M |({
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} %w8GGm8^/
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publicList findByNamedQuery(finalString query, oS#'u1k
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finalObject parameter){ ~'NpM#A
return getHibernateTemplate ^2C /!Y<
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().findByNamedQuery(query, parameter); ta4JWllf
} (YYj3#|
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publicList findByNamedQuery(finalString query, o!toO&=
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finalObject[] parameters){ M9s43XL(&
return getHibernateTemplate I' ! r
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().findByNamedQuery(query, parameters); <{cNgKd9
} S2
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publicList find(finalString query){ =0PRAc
return getHibernateTemplate().find w &|R5Q
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(query); I& M36f
} G=Hf&l
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publicList find(finalString query, finalObject 5`E`Kb+@
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parameter){ EY)Gi`lK
return getHibernateTemplate().find hH1lgc
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(query, parameter); @ 2!C^}d3F
} .;HIEj zq
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public PaginationSupport findPageByCriteria B+Y5b5+wOQ
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(final DetachedCriteria detachedCriteria){ !0ce kSesr
return findPageByCriteria 4N~+G `
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); v.Xoq
} $Eio$TI
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public PaginationSupport findPageByCriteria xEVLE,*?>
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(final DetachedCriteria detachedCriteria, finalint 8VP"ydg-U
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startIndex){ 2f|6z-Z
return findPageByCriteria !.3R~0b
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(detachedCriteria, PaginationSupport.PAGESIZE, @n7t?9Bx
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startIndex); s!#HZK
} zb5N,!%r
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public PaginationSupport findPageByCriteria kG)2%
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(final DetachedCriteria detachedCriteria, finalint 8M^wuRn
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pageSize, F&QTL-pQW
finalint startIndex){ 3ar=1_Ar
return(PaginationSupport) K DYYB6|
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getHibernateTemplate().execute(new HibernateCallback(){ 4l&"]9D
publicObject doInHibernate gEv-> pc
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(Session session)throws HibernateException { ?&znUoB
Criteria criteria = e=t<H"&
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detachedCriteria.getExecutableCriteria(session); Ys-Keyg
int totalCount = >1x7UXs~:
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((Integer) criteria.setProjection(Projections.rowCount {ITv&5?>
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()).uniqueResult()).intValue(); d/XlV]#2x\
criteria.setProjection 8zdT9y|Ig
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(null); 6hkkNXqkf
List items = D@8jGcz62
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criteria.setFirstResult(startIndex).setMaxResults 1GtOA3,~;-
07x=`7hs}
(pageSize).list(); j$@?62)6
PaginationSupport ps = [@m[V1D
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new PaginationSupport(items, totalCount, pageSize, c[SU5 66y
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startIndex); zKLn!b#>
return ps; NSw<t9Yi
} XQ]`&w(
}, true); #gh
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} l8z%\p5cR
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public List findAllByCriteria(final Lf
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DetachedCriteria detachedCriteria){ z|ves&lRa
return(List) getHibernateTemplate cDCJ]iDs
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().execute(new HibernateCallback(){ ,I]7g4~
publicObject doInHibernate v btAq^1
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(Session session)throws HibernateException { $[,l-[-+
Criteria criteria = vXephR'
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detachedCriteria.getExecutableCriteria(session); #wr2imG6
return criteria.list(); SO`dnf
} 8QV t,
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}, true); < CDA"
} z^r|3;
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public int getCountByCriteria(final Rab#7Q16Q8
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DetachedCriteria detachedCriteria){ /I`3dWL
Integer count = (Integer) ;Xqn-R
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getHibernateTemplate().execute(new HibernateCallback(){ Yi 6Nw+$
publicObject doInHibernate kl"
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(Session session)throws HibernateException { q69H^E=
Criteria criteria = Q uB+vL
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detachedCriteria.getExecutableCriteria(session); @rF/]UJ
return MEEAQd<*
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criteria.setProjection(Projections.rowCount Jy9bY
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()).uniqueResult(); dLZjB(0eO
} 0 h22V$
}, true); >9=:sSQu
return count.intValue(); Qm<
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} +@0TMK,P
} yO=p3PV d
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用户在web层构造查询条件detachedCriteria,和可选的 L1wZU, o
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 RX'-99M
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PaginationSupport的实例ps。 V5AW&kfd
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ps.getItems()得到已分页好的结果集 ;UrK{>B
ps.getIndexes()得到分页索引的数组 ;|<(9u`
ps.getTotalCount()得到总结果数 ~Q?!W0ZBE
ps.getStartIndex()当前分页索引 CZY7S*fL
ps.getNextIndex()下一页索引 n+HsQ]z.
ps.getPreviousIndex()上一页索引 3y ryeS
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 SauH>
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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 ?g3 ]~;#
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一下代码重构了。 T1W:>~T5#
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我把原本我的做法也提供出来供大家讨论吧: U]1(&MgV
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首先,为了实现分页查询,我封装了一个Page类: \tx%WC
java代码: 0I5&a
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/*Created on 2005-4-14*/ =1Z;Ma<;
package org.flyware.util.page; \3zp)J
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/** K"\MU
* @author Joa Hm
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* wzh]97b
*/ GX?*1
publicclass Page { Km!nM$=k
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/** imply if the page has previous page */ "'a* [%
privateboolean hasPrePage; ]\Xc9N8w
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/** imply if the page has next page */ u[")*\CP
privateboolean hasNextPage; S@xXq{j
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/** the number of every page */ gcf6\f}\<
privateint everyPage; Dx-KMiQ,"(
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/** the total page number */ U>P|X=)
privateint totalPage; \4{2eU
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/** the number of current page */ +7U
privateint currentPage; nX^1$')gp
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/** the begin index of the records by the current ~e">_;k6
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query */ bA@P}M)X
privateint beginIndex; (UYF%MA}"
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/** The default constructor */ h2w}wsb0l
public Page(){ C4\,z\Q
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} j U[
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/** construct the page by everyPage rNlW7Y
* @param everyPage E4i0i!<z
* */ QA;!caNp
public Page(int everyPage){ Tycq1i^
this.everyPage = everyPage; &(blN.2
} bMKL1+y(
+ G;LX'B
/** The whole constructor */ >&S0#>wmyG
public Page(boolean hasPrePage, boolean hasNextPage, ~AZWds(,N
nfdq y)
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int everyPage, int totalPage, o.7{O,v
int currentPage, int beginIndex){ 5$rSEVg9
this.hasPrePage = hasPrePage; h}L}[
this.hasNextPage = hasNextPage; fuX'~$b.fA
this.everyPage = everyPage; bZ 443SG
this.totalPage = totalPage; T$+-IAE
this.currentPage = currentPage; _S@aGw
this.beginIndex = beginIndex; |Au ]1}
} M4m$\~zf
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/** MYLsHIPC
* @return {9LWUCpsf
* Returns the beginIndex. Bs;|D
*/ PdeBDFWD
publicint getBeginIndex(){ JkQ\)^5v
return beginIndex; ;V5yXNQ
} ~1kXUWq3
k2 Q
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/** v~|?3/{Q
* @param beginIndex (% _n!ip^
* The beginIndex to set. f)Xr!7
*/ <F=9*.@D
publicvoid setBeginIndex(int beginIndex){ 1HT_
this.beginIndex = beginIndex; E?)656F[
} ve6w<3D@
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/** ?rYT4vi
* @return b)#Oc,
* Returns the currentPage. $s5a G)?7
*/ ^U[D4UM
publicint getCurrentPage(){ :dI\z]Y(
return currentPage; CC^E_j T
} %^]?5a!
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/** #Q"O4 b:8
* @param currentPage w
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* The currentPage to set. %A/_5;PZ/
*/ 1|r,dE2k9
publicvoid setCurrentPage(int currentPage){ fbvbz3N
this.currentPage = currentPage; @Xp~2@I=ls
} 3AcD,,M>>
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/** @A<PkpNL
* @return ?sz)J3
* Returns the everyPage. ,XkGe
*/ 5ETip'<KT6
publicint getEveryPage(){ @`36ku
return everyPage; 4qi[r)G
} [K/m
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/** 0\9K3
* @param everyPage o=J9
* The everyPage to set. }J:+{4Yn
*/
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publicvoid setEveryPage(int everyPage){ 8flOq"uK^
this.everyPage = everyPage; [U@;\V$
} _ *f
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/** k^"bLf(4
* @return RoGwK*j0+
* Returns the hasNextPage. W,^W^:m-x
*/ q@hzo>[
publicboolean getHasNextPage(){ K14^JAdY/
return hasNextPage; M=qb^~ l
} ao_4m SB
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/** EZ;"'4;W
* @param hasNextPage :#k &\f-Y
* The hasNextPage to set. ]i<[d,
*/ KnhoaBB
publicvoid setHasNextPage(boolean hasNextPage){ 5q9s,r_
this.hasNextPage = hasNextPage; rKH:[lKm
} ew _-Eb
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/** w;UqEC V
* @return /H7&AiA