Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 ]U[&uymax
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 a%E8(ms37y
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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 r{S=Z~J
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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 dKm`14f]@G
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分页支持类: Z(HZB
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java代码: >!
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package com.javaeye.common.util; lUHtjr
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import java.util.List;
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publicclass PaginationSupport { 9 #Y2`pT
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publicfinalstaticint PAGESIZE = 30; E?Cj/o
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privateint pageSize = PAGESIZE; s`c?:
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privateList items; Vv7PCaq
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privateint totalCount; H* /&A9("
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privateint[] indexes = newint[0]; ,eXFN?CB
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privateint startIndex = 0; 1~@|eWr|
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public PaginationSupport(List items, int > rw"Rd'
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totalCount){ ~C|,b"
setPageSize(PAGESIZE); p+[}Hxx=
setTotalCount(totalCount); u s`}
setItems(items); @6b[GekZ<
setStartIndex(0); Q>=-ext}q
} cy3M^_5B<
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public PaginationSupport(List items, int hgO?+x
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totalCount, int startIndex){ [))JX"a
setPageSize(PAGESIZE); lR@& Z6lw
setTotalCount(totalCount); W2 <3C
setItems(items); K/|
setStartIndex(startIndex); H)5QqZ8
} tpo>1|
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public PaginationSupport(List items, int ]fE3s{y
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totalCount, int pageSize, int startIndex){ y(v_-6b
setPageSize(pageSize); -B9S}NPo
setTotalCount(totalCount); q-
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setItems(items); yW("G-Nm
setStartIndex(startIndex); d}-'<Z#G
} s}(X]Gx1
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publicList getItems(){ 2ykCtRe
return items; 4SR(->@
} g1@wf
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publicvoid setItems(List items){ k[9A,N^lZB
this.items = items; GNU;jSh5
} s;1e0n
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publicint getPageSize(){ |>2:eH
return pageSize; CH;;V3
} tpYa?ZCM
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publicvoid setPageSize(int pageSize){ A1-qtAO]
this.pageSize = pageSize; ZEGd4_ux
} 0d4cE10
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publicint getTotalCount(){ yX!#a>d"H
return totalCount; 9j#@p
} H]Wp%"L
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publicvoid setTotalCount(int totalCount){ L~eAQR
if(totalCount > 0){ J+Bdz6lt
this.totalCount = totalCount; IN^_BKQt
int count = totalCount / V@Wcb$mgk
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pageSize; :woa&(wN;1
if(totalCount % pageSize > 0) <Wy>^<`
count++; *]x_,:R6Ow
indexes = newint[count]; a)S7}0|R
for(int i = 0; i < count; i++){ C) .2gQ
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indexes = pageSize * ce' TYkPM
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i; TpP8=8_Lh
} <AUWby,"
}else{ /s[DI;M$o
this.totalCount = 0; 'ere!:GJD
} O&'/J8
} Q4wc-s4RN
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publicint[] getIndexes(){ /6U
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return indexes; };sMU6e
} <*Y'lV
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publicvoid setIndexes(int[] indexes){ DB@EVH
this.indexes = indexes; ;&,.TC?l
} IKcKRw/O$
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publicint getStartIndex(){ (M`|'o!
return startIndex; Ro r2qDF
} LC-)'Z9}5
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publicvoid setStartIndex(int startIndex){ U:|H9+5
if(totalCount <= 0) ut5yf$%
this.startIndex = 0; BXhWTGiG
elseif(startIndex >= totalCount) VPd,]]S5(
this.startIndex = indexes U CY2]E
)#`H."Z
[indexes.length - 1]; =nVmthGw
elseif(startIndex < 0) 6vp0*ww
this.startIndex = 0; H?U't
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else{ <y>:B}9'
this.startIndex = indexes )i!^]| $
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[startIndex / pageSize]; 7>-yaL{
} %j{.0H
} :'*DMW~
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publicint getNextIndex(){ %^.P~s6
int nextIndex = getStartIndex() + I]uhi{\C
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pageSize; ]}2Ztr)zZ
if(nextIndex >= totalCount) nY^Nbh0
return getStartIndex(); d
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else Fu)Th|5GZ
return nextIndex; -&Gfh\_NW
} @E_zR
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publicint getPreviousIndex(){ 2F?kjg,
int previousIndex = getStartIndex() - 8QF`,oXQO
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pageSize; Z2p> n`D
if(previousIndex < 0) +t]Xj1Q
return0;
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else ("Dv>&w9
return previousIndex; wUp)JI
} cZQu *K^j
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} RJc%,
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抽象业务类 T-8J
java代码: <NB41/
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/** @@}`hii
* Created on 2005-7-12 zvf3b!}
*/ Dip*}8$o(w
package com.javaeye.common.business; F2>%KuM
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import java.io.Serializable; =!<G!^
import java.util.List; 3] 76fF\^[
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import org.hibernate.Criteria; ;f%|3-q1[
import org.hibernate.HibernateException; kuS/S\Z5K
import org.hibernate.Session; GGE[{Gb9
import org.hibernate.criterion.DetachedCriteria; wO!u!I
import org.hibernate.criterion.Projections;
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import CC8k&u,
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org.springframework.orm.hibernate3.HibernateCallback; {Y_Nj`#BT
import nj2gs,k
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org.springframework.orm.hibernate3.support.HibernateDaoS Hed$ytMaGz
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upport; I;j3*lV_
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import com.javaeye.common.util.PaginationSupport; E`AYee%l
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public abstract class AbstractManager extends 1K[(ou'rl
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HibernateDaoSupport { }lfn0 %(@
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privateboolean cacheQueries = false; \ 4gXY$`@
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privateString queryCacheRegion; XxOn3i
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publicvoid setCacheQueries(boolean 7~vqf3ON4J
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cacheQueries){ GqUSVQ
this.cacheQueries = cacheQueries; 3j*'HST
} sh6(z?KP
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publicvoid setQueryCacheRegion(String l)8sw=
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queryCacheRegion){ abWl ut
this.queryCacheRegion = Sdc*rpH"(
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queryCacheRegion; `-O=>U5nH
} MsjnRX:c3u
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publicvoid save(finalObject entity){ detL jlE
getHibernateTemplate().save(entity); &O tAAE
} t)I0lnbs
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publicvoid persist(finalObject entity){ =Ahw%`/&}]
getHibernateTemplate().save(entity); v*r9j8
} grbTcLSF
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publicvoid update(finalObject entity){ &;v!oe
getHibernateTemplate().update(entity); gpAHC
} s*JE)
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publicvoid delete(finalObject entity){ o}~3JBnT
getHibernateTemplate().delete(entity); yWHne~!
} sXB+s
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publicObject load(finalClass entity, >&hX&,hG
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finalSerializable id){ w3bIb$12
return getHibernateTemplate().load u^=@DO'
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(entity, id); a8JN19}D
} },PBqWe
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publicObject get(finalClass entity, fn1pa@P
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finalSerializable id){ s.y}U5Ty?P
return getHibernateTemplate().get
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(entity, id); AgsR-"uh
} 7;xKy'B\
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publicList findAll(finalClass entity){ bi,mM,N/
return getHibernateTemplate().find("from l* Y[^'
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" + entity.getName()); 0N VI+Z$
} : bv|Ah
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publicList findByNamedQuery(finalString Qa?aL
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namedQuery){ };p~A-E=
return getHibernateTemplate Gl>E[iO
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().findByNamedQuery(namedQuery); (1 yGg==W.
} %#9P?COs&W
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publicList findByNamedQuery(finalString query, xjrlc9
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finalObject parameter){ oKiD8':
return getHibernateTemplate q?iCc c
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().findByNamedQuery(query, parameter); ;[~^(.
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} 'w6hW7"L
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publicList findByNamedQuery(finalString query, u]*5Ex (?
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finalObject[] parameters){ %MuaW(I o
return getHibernateTemplate oCA(FQ6
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().findByNamedQuery(query, parameters); !a[$)c
} F[`vH
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publicList find(finalString query){ yFO)<GLk
return getHibernateTemplate().find +2y&B,L_Wh
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(query); R&!]Rl9hf
} +-P<CCvWz
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publicList find(finalString query, finalObject ^4UcTjh
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parameter){ -yA3 RP
return getHibernateTemplate().find "Q?_ EE n
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(query, parameter); X<FOn7qf
} %,;gP.dh7
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public PaginationSupport findPageByCriteria ucM.Ro=@
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(final DetachedCriteria detachedCriteria){ -lnevrl
return findPageByCriteria +"Ub/[J{G1
+ !xu{2 !
(detachedCriteria, PaginationSupport.PAGESIZE, 0); @<5Tba>SC
} sDAK\#z
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public PaginationSupport findPageByCriteria sMX$Q45e
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(final DetachedCriteria detachedCriteria, finalint Um'Ro 4
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startIndex){ o}W;Co
return findPageByCriteria 4Pf+]R
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(detachedCriteria, PaginationSupport.PAGESIZE, raF]
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startIndex); m0C{SBn-M
} 0@v2*\D#
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public PaginationSupport findPageByCriteria D&f!( n
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(final DetachedCriteria detachedCriteria, finalint WP!il(Gr
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pageSize, Se/ss!If
finalint startIndex){ N-Z^G<[q.
return(PaginationSupport) ^Rk^XQCh
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getHibernateTemplate().execute(new HibernateCallback(){ l# BZzJ?~
publicObject doInHibernate nj"m^PmWo3
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(Session session)throws HibernateException { e3pnk
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Criteria criteria = nUqL\(UuY
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detachedCriteria.getExecutableCriteria(session); ]7l{g9?ZtV
int totalCount = (QKsB3X
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((Integer) criteria.setProjection(Projections.rowCount ,@479ZvvR3
T,Fm"U6[(
()).uniqueResult()).intValue(); vgN@~Xa
criteria.setProjection fOLnK
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(null); v!KJ|c@m
List items = }Q;BQ2[
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criteria.setFirstResult(startIndex).setMaxResults |
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(pageSize).list(); Cg7)S[zl
PaginationSupport ps = c~37+^B:
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new PaginationSupport(items, totalCount, pageSize, N:7.:Yw
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startIndex); }Wqtip:L
return ps; IG&B2*
} U(!?d ]en
}, true); w?i)/q
} :S#i9# aB
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public List findAllByCriteria(final oHk27U G
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DetachedCriteria detachedCriteria){ y%FYXwR{
return(List) getHibernateTemplate IBDVFA
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().execute(new HibernateCallback(){ zNwc((
publicObject doInHibernate !9PX\Xbn
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(Session session)throws HibernateException { ~Z7)x7
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Criteria criteria = 1S&0
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detachedCriteria.getExecutableCriteria(session); R7,pukK
return criteria.list(); UL[uh@4
} b70AJe=
}, true); vLr&ay!w
} {x|MA(NO
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public int getCountByCriteria(final ZDfS0]0F
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DetachedCriteria detachedCriteria){ k5q(7&C
Integer count = (Integer) m+p4Mc%u
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getHibernateTemplate().execute(new HibernateCallback(){ GG*BN<(>!
publicObject doInHibernate pA*i!.E/b
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(Session session)throws HibernateException { k,AM]H
Criteria criteria = uRFNfX(*
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detachedCriteria.getExecutableCriteria(session); *XHj)DC;
return 50COL66:7
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criteria.setProjection(Projections.rowCount y _6r/z^
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()).uniqueResult(); pTN%;`)
{
} xS-w\vbLV
}, true); b#e]1Q
return count.intValue(); @PKAz&0
} 4_WH
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} v [dAywW
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用户在web层构造查询条件detachedCriteria,和可选的 V, E9Uds
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 =Z^un&'
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PaginationSupport的实例ps。 ybC-f'0
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ps.getItems()得到已分页好的结果集 ixg\[5.Q+
ps.getIndexes()得到分页索引的数组 n<=y"*
ps.getTotalCount()得到总结果数 x, }ez
ps.getStartIndex()当前分页索引 w' .'Yu6
ps.getNextIndex()下一页索引 y(V&z"wk[
ps.getPreviousIndex()上一页索引 B$@1QG
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 eog\pMv
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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 *Rz!i m|
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一下代码重构了。 0kkRK*fp}x
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我把原本我的做法也提供出来供大家讨论吧: /5&3WG&<u
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首先,为了实现分页查询,我封装了一个Page类: | pF5`dX
java代码: 7k.d|<mRv
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/*Created on 2005-4-14*/ N'htcC
package org.flyware.util.page; f34_?F<h
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/** tq2-.]Y@U
* @author Joa @?'t@P:4
*
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*/ #8P#^v]H
publicclass Page { 1'(_>S5CG
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/** imply if the page has previous page */ 0*/mc9 6
privateboolean hasPrePage; j0ci~6&b3_
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/** imply if the page has next page */ : ;|)/
privateboolean hasNextPage; Xw&QrTDS`
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/** the number of every page */ r)) $XM
privateint everyPage; 6-)7:9y
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/** the total page number */ Bl>_&A)
privateint totalPage; yBpW#1=
W@R$'r,@O
/** the number of current page */ M!;`(_2
privateint currentPage; W;xW:
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/** the begin index of the records by the current "`gf y
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query */ ]#vvlM>/
privateint beginIndex; :DS2zA
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/** The default constructor */ MAm1w'ol"
public Page(){ oO! 1
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} j1'xp`jgv
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/** construct the page by everyPage X
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* @param everyPage GC5#1+fQ
* */ U89]?^|bb
public Page(int everyPage){ :F!dTD$
this.everyPage = everyPage; EM>c%BH<N
} eONeWY9
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/** The whole constructor */ V0SW 5
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public Page(boolean hasPrePage, boolean hasNextPage, =)"NE>
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8GF[)z&|P:
int everyPage, int totalPage, -s?dzX
int currentPage, int beginIndex){ >/*?4
this.hasPrePage = hasPrePage; CSd9\V
this.hasNextPage = hasNextPage; ~:P8g<w
this.everyPage = everyPage; Pj1K
this.totalPage = totalPage; =]5DYRhX]
this.currentPage = currentPage; y]~+ `9
this.beginIndex = beginIndex; |!jYv'%
} 7?n*t
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/** 89:?.'
* @return mVc'%cPaw
* Returns the beginIndex. {2'74
*/ j.
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publicint getBeginIndex(){ ims=-1,
return beginIndex; &vJ(P!2f<
} fl5UY$a2-
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/** {WM&
* @param beginIndex 3isXgp8
* The beginIndex to set. wB1-|=K1
*/ bJG!)3cx
publicvoid setBeginIndex(int beginIndex){ b]tA2~e
this.beginIndex = beginIndex; n]6}yJJo
} i5>J
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/** %>I?'y^
* @return >[E|p6jgT
* Returns the currentPage. ei|*s+OZu
*/
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publicint getCurrentPage(){ _!$Up
return currentPage; 3[|:sa8?s
} '
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/** }v'PY/d.
* @param currentPage a@S4IoBg%
* The currentPage to set. NbQMWU~7
*/ rH2tC=%
publicvoid setCurrentPage(int currentPage){ C>k;Mvq O
this.currentPage = currentPage; tLoD"/z
} XEgx#F ;F
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/** Z CQt1;
* @return +s*l#'Q
* Returns the everyPage. pdcwq~4~%
*/ ]U^d 1&k
publicint getEveryPage(){ Dbkuh!R
return everyPage; c9ov;Bw6S
} Q'Q72Fg
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/** Ls$g-k%c@Q
* @param everyPage &[W3e3Asra
* The everyPage to set. *k@0:a(>
*/ 0]2B-o"kI
publicvoid setEveryPage(int everyPage){ HhY2`P8
this.everyPage = everyPage;
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} 28UL
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/** ;+TF3av0zq
* @return J?n)FgxS
* Returns the hasNextPage. [-:<z?(n4
*/ &\6`[# bT
publicboolean getHasNextPage(){ }
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return hasNextPage; oZ*=7u
} _?(hWC"0
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/** Q
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* @param hasNextPage ;SlS!6.W-
* The hasNextPage to set. jN'fm
*/ u{{xnyl?
publicvoid setHasNextPage(boolean hasNextPage){ #iqhm,u7D
this.hasNextPage = hasNextPage; qqom$H<
} "ZJ1`R=Mj
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/** (fk, 80
* @return 2
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* Returns the hasPrePage. ,T21z}r
*/ !ovZ>,1
publicboolean getHasPrePage(){ cJ(zidf_$
return hasPrePage; 1R+ )T'in
} c^[1]'y
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/** =
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* @param hasPrePage SU#P.y18%
* The hasPrePage to set. <
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*/ .^`a6>EQ)|
publicvoid setHasPrePage(boolean hasPrePage){ ,d [b"]Zy
this.hasPrePage = hasPrePage; O3w_vm'
} ZTPOD.:#
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/** Dxa)7dA|
* @return Returns the totalPage. vA7jZw
* A2O_pbQti
*/ "TH-A6v1
publicint getTotalPage(){ O"s`-OM;n
return totalPage; ^* /v,+01f
} ZNH*[[Pf
GT\s!D;<
/** 3RH#e1Y
* @param totalPage f{ 4G
* The totalPage to set. '*LN)E>d
*/ hZ\W ?r
publicvoid setTotalPage(int totalPage){ U0bEB
this.totalPage = totalPage; 'B<qG<>
} m5;[,He
{@K2WB
} xMfv&q=k@
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#ZnX6=;X
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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 )Fr;'JYC1S
^B6i6]Pd=9
个PageUtil,负责对Page对象进行构造: b\Xu1>
java代码: +_XbHjhN/
V8U`%/`N
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/*Created on 2005-4-14*/ g;Sg
2
package org.flyware.util.page; ~ew**@N
^(m6g &$(
import org.apache.commons.logging.Log; [?f.0q
import org.apache.commons.logging.LogFactory; g
/ @yK
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/** N5an9r&z(1
* @author Joa (7jB_ p%
* n\ ',F
*/ J)yy}[Fx
publicclass PageUtil { lbuW*)
=UKR<@QrK
privatestaticfinal Log logger = LogFactory.getLog .gkPG'm[
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(PageUtil.class); 't%%hw-m}
-S3+
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/** >8fz ?A
* Use the origin page to create a new page L9YwOSb.
* @param page *=0r>]
* @param totalRecords eP)YJe 3
* @return "%f5ltut3
*/ \/4%[Q2QDm
publicstatic Page createPage(Page page, int S{)n0/_
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totalRecords){ A%w]~ chC9
return createPage(page.getEveryPage(), }:D~yEP
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page.getCurrentPage(), totalRecords); gsR9M%mv
} y=qo-v59'
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/** 5eSTT#[+R
* the basic page utils not including exception &@iF!D\u
@SG="L
handler 8\.1m9&r>o
* @param everyPage Oi[9b
* @param currentPage irw 7
* @param totalRecords <