Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 q| 7(
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 b'y%n
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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 No$3"4wk
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 HsWk*L `y
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分页支持类: #z(]xI)"
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java代码: [K Qi.u
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package com.javaeye.common.util; df=f62
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import java.util.List; ta0|^KAA
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publicclass PaginationSupport { <%^&2UMg
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publicfinalstaticint PAGESIZE = 30; Smh,zCc>s
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privateint pageSize = PAGESIZE; 7^Uv7<pw
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privateList items; >!JS:5|
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privateint totalCount; 2eogY#
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privateint[] indexes = newint[0]; k+/6$pI
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privateint startIndex = 0; pYg/Zm
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public PaginationSupport(List items, int ^
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totalCount){ =wJX0A|
setPageSize(PAGESIZE); K"6vXv4QO
setTotalCount(totalCount); =M1I>
setItems(items); {:s f7
setStartIndex(0); qK+5NF|
} `^vE9nW7
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public PaginationSupport(List items, int #tHK"20
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totalCount, int startIndex){ ~u{uZ(~
setPageSize(PAGESIZE); SM'|+ d
setTotalCount(totalCount); 0K+ne0I
setItems(items); kM6
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setStartIndex(startIndex); NbobliC=
} e.> P8C<&
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public PaginationSupport(List items, int W^Yxny
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totalCount, int pageSize, int startIndex){ ~[ jQ!tz
setPageSize(pageSize); |pK!S
setTotalCount(totalCount); I]575\bA
setItems(items); ' QG?nu
setStartIndex(startIndex); 7pd$\$
} 1\Xw3prH
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publicList getItems(){ !1k_PY5)
return items; F2WKd1U
} W!X@
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publicvoid setItems(List items){ 8}[).d160
this.items = items;
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} dG{A~Z z
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publicint getPageSize(){ Ba,`TJ%y
return pageSize; eRYK3W
} \RiP
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publicvoid setPageSize(int pageSize){ vdZW%-A&\
this.pageSize = pageSize; d$RIS+V
} `A >@]d
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publicint getTotalCount(){ M{@(G5
return totalCount; =(Mch~
} -~0^P,yQ
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publicvoid setTotalCount(int totalCount){ P?\6@_ Z
if(totalCount > 0){ @- xjfC\d
this.totalCount = totalCount; ]'}L 1r
int count = totalCount / G2D$aSh
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pageSize; x4 yR8n(
if(totalCount % pageSize > 0) pb}*\/s
count++; &HW9Jn
indexes = newint[count]; O?2DQY?jT
for(int i = 0; i < count; i++){ +R &gqja
indexes = pageSize * NJ<F>3
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} X,
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}else{ 6'/ #+,d'
this.totalCount = 0; _U(
} Nc`L;CP
} [6fQ7uFMM8
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publicint[] getIndexes(){ +rd+0 `}C
return indexes; e=
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} yAt^;
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publicvoid setIndexes(int[] indexes){ \e;iT\=.(
this.indexes = indexes; fu5=k:/c
} A&VG~r$
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publicint getStartIndex(){ w>gYx(8b
return startIndex; xpt:BBo
} Sc0w.5m6
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publicvoid setStartIndex(int startIndex){ X8|,
if(totalCount <= 0) DVA:Cmh\
this.startIndex = 0; :>
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elseif(startIndex >= totalCount) ;I}fBZ3
this.startIndex = indexes $i&zex{\
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[indexes.length - 1]; z_HdISy0
elseif(startIndex < 0) UNYqft4
this.startIndex = 0; Da|z"I
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else{ mt
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this.startIndex = indexes @]j1:PN-
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[startIndex / pageSize]; ^c|/*u
} iTwm3V
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} ;pAK_>
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publicint getNextIndex(){ ;p//QJB9
int nextIndex = getStartIndex() + LoV<:|GTI
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pageSize; K0~rN.C!0
if(nextIndex >= totalCount) jd:6:Fm
return getStartIndex(); R&&4y 7
else A^g(k5M*
return nextIndex; Nb\4 /;#
} By|4m
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publicint getPreviousIndex(){ ?< +WG/(d
int previousIndex = getStartIndex() - @{Q4^'K"
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pageSize; 7#XzrT]
if(previousIndex < 0) qGo.WZ$
return0; qX%_uOw:%
else 1zv'.uu.,
return previousIndex; :;}P*T*PU
} ?}oFg#m-<L
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} 9{l}bu/u
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抽象业务类 FrS]|=LJhX
java代码: Ui~>SN>s
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/** [,Gg^*umS
* Created on 2005-7-12 (QEG4&9
*/ 6x`t{g]f,
package com.javaeye.common.business; QRUz`|U
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import java.io.Serializable; 01]f2.5
import java.util.List; Z@HEj_n
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import org.hibernate.Criteria; j#|ZP-=1_
import org.hibernate.HibernateException; vh^VxS
import org.hibernate.Session; q9"96({\@
import org.hibernate.criterion.DetachedCriteria; V[LglPt
import org.hibernate.criterion.Projections; zhQJy?>'m
import 7!1S)dup
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org.springframework.orm.hibernate3.HibernateCallback; (PLUFT
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org.springframework.orm.hibernate3.support.HibernateDaoS !$JT e
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upport; KlEpzJ98
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import com.javaeye.common.util.PaginationSupport; :WEDAFq0
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public abstract class AbstractManager extends >4TO=i
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HibernateDaoSupport { &C}*w2]0S
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privateboolean cacheQueries = false; %9"H
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privateString queryCacheRegion; _a, s
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publicvoid setCacheQueries(boolean \fOEqe*5SM
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cacheQueries){ #!=tDc
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this.cacheQueries = cacheQueries; VbYdZCC
} )%TmAaj9d
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publicvoid setQueryCacheRegion(String mH(:?_KrS-
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queryCacheRegion){ }MySaL>
this.queryCacheRegion = w0.
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+ {]j]OP
queryCacheRegion; k$Vl fQ'+
} 5P bW[
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publicvoid save(finalObject entity){ [),ige
getHibernateTemplate().save(entity); C!gZN9-
} '/p4O2b,
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publicvoid persist(finalObject entity){ P}iE+Z3
getHibernateTemplate().save(entity); +`4A$#$+y
} (Ld i|jL
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publicvoid update(finalObject entity){ qq?!LEZ
getHibernateTemplate().update(entity); rv;3~'V
} :RYTL'hes
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publicvoid delete(finalObject entity){ , gHDx
getHibernateTemplate().delete(entity); _1^'(5f$
} crCJrN=
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publicObject load(finalClass entity, [[ZJ]^n,
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finalSerializable id){ e20-h3h+
return getHibernateTemplate().load {
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(entity, id); 'w/hw'F6
} ]9-\~Mwh
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publicObject get(finalClass entity, XW9!p.*.U
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finalSerializable id){ nN;u,}e
return getHibernateTemplate().get zs;JJk^
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(entity, id); (H]AR8%W
} *Ex|9FCt$
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publicList findAll(finalClass entity){ ;S{(]K7i
return getHibernateTemplate().find("from '-6~tWC~7
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" + entity.getName()); g0H[*"hj
} 'qi}|I
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publicList findByNamedQuery(finalString <3iMRe
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namedQuery){ $'TM0Yu,
return getHibernateTemplate a.'*G6~Qgw
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().findByNamedQuery(namedQuery); GILfbNcd
} qR.Q,(b|
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publicList findByNamedQuery(finalString query, ^8tEach
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finalObject parameter){ s{++w5s
return getHibernateTemplate :,^gj
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().findByNamedQuery(query, parameter); R+| h w;
} Vi}_{
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publicList findByNamedQuery(finalString query, <#.g=ay
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finalObject[] parameters){ zT/\Cj68
return getHibernateTemplate ;jPXs
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().findByNamedQuery(query, parameters); MDN--p08
} BVm0{*-[|
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publicList find(finalString query){ 2:R+tn(F
return getHibernateTemplate().find *I'yH8Fcn
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(query); h![#;>(
} f?b"i A(6
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publicList find(finalString query, finalObject zX~MC?,W1
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parameter){ Q&&@v4L
return getHibernateTemplate().find t5zKW _J7
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(query, parameter); 4YHY7J
} f)!Z~t &
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public PaginationSupport findPageByCriteria HDKbF/
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(final DetachedCriteria detachedCriteria){ b[yiq$K/
return findPageByCriteria 7rA;3?p)
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); y]imZ4{/
} SaCh
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public PaginationSupport findPageByCriteria /bEAK-
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(final DetachedCriteria detachedCriteria, finalint
7.T?#;'3
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startIndex){ X.V~SeS
return findPageByCriteria __@BUK{ q
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(detachedCriteria, PaginationSupport.PAGESIZE, mTh]PPo
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startIndex); [Yyk0Qv|4
} -+5>|N#
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public PaginationSupport findPageByCriteria X|[`P<'N<
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(final DetachedCriteria detachedCriteria, finalint Ug`djIL
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pageSize, b2]Kx&!
finalint startIndex){ jIF
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return(PaginationSupport) Bf:Q2slqI
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getHibernateTemplate().execute(new HibernateCallback(){ XM}hUJJW
publicObject doInHibernate Q^I\cAIB
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(Session session)throws HibernateException { CJ%I51F`X
Criteria criteria =
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detachedCriteria.getExecutableCriteria(session); 8D].MI^
int totalCount = bi:8(Q$w:`
+)?J#g
((Integer) criteria.setProjection(Projections.rowCount fQ98(+6
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()).uniqueResult()).intValue(); q9NoI(]e
criteria.setProjection _FEFx
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(null); _rYkis^u
List items = |%v^W 3
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criteria.setFirstResult(startIndex).setMaxResults <ih[TtZ
-![|}pX
(pageSize).list(); /@Zrq#o
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PaginationSupport ps = v3qA":(w+(
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new PaginationSupport(items, totalCount, pageSize, >j`qh:^
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startIndex); \Roz$t-R|f
return ps; x`?3C"N:<
} 4fzZ;2sl}
}, true); d %#b:(,
} c(%|: P^
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public List findAllByCriteria(final .~}1+\~5
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DetachedCriteria detachedCriteria){ xKC[=E>z
return(List) getHibernateTemplate yEoV[K8k
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().execute(new HibernateCallback(){ 0;ji65
publicObject doInHibernate `XB
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(Session session)throws HibernateException { $A`VYJtt#
Criteria criteria = NCx%L-GPi
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detachedCriteria.getExecutableCriteria(session); H.2QKws^F
return criteria.list(); J$!iq|
} *#Wdc O`-
}, true); @A5?3(e
} UDni]P!E
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public int getCountByCriteria(final y Wya&|D9
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DetachedCriteria detachedCriteria){ E!#WnSpnK
Integer count = (Integer) -gWZwW/lD
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getHibernateTemplate().execute(new HibernateCallback(){ Faf&U%]*`
publicObject doInHibernate rbCAnwA2
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(Session session)throws HibernateException { ;\l,5EG
Criteria criteria = {_Gs*<.
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detachedCriteria.getExecutableCriteria(session); hL5|69E
return nLiY%x`S
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criteria.setProjection(Projections.rowCount c=+!>Z&i$G
A4ygW:
()).uniqueResult(); P2*<GjV`S/
} `#gie$B{
}, true); <o= 8FO
return count.intValue(); veRm2LSP
} #=v~8
} 9M9?%N:ra
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用户在web层构造查询条件detachedCriteria,和可选的 4g7)i L^#~
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 VYhbx
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PaginationSupport的实例ps。 V/;B3t~f
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ps.getItems()得到已分页好的结果集 Z:7fV5b(
ps.getIndexes()得到分页索引的数组 6i*sm.SDw
ps.getTotalCount()得到总结果数 orvp*F{7[H
ps.getStartIndex()当前分页索引 h65-s
ps.getNextIndex()下一页索引 65m"J'
ps.getPreviousIndex()上一页索引 ^Q^_?~h*!
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 9<)NvU^-r
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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 4 N7^?
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一下代码重构了。 :#~j:C|
++#5
我把原本我的做法也提供出来供大家讨论吧: {GcO3G#FZ
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首先,为了实现分页查询,我封装了一个Page类: Z87|Zl
java代码: d5z`B H.
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/*Created on 2005-4-14*/ !7&5` q7
package org.flyware.util.page;
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/** o7LuKRl
* @author Joa o\)F}j&b#=
* 9
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*/ B !=F2
publicclass Page { uc"P3,M
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/** imply if the page has previous page */ .@Dxp]/B}
privateboolean hasPrePage; PIpi1v*qz
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/** imply if the page has next page */ ^Js9 s8?$
privateboolean hasNextPage; b,%C{mC
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/** the number of every page */ ")HFYqP>9
privateint everyPage; 9pxc~=
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/** the total page number */ oFGhNk
privateint totalPage; {s{j~M
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/** the number of current page */ QW~1%`
privateint currentPage; V}NbuvDB@
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/** the begin index of the records by the current lR6x3C
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query */ ig':%2V/
privateint beginIndex; Oh\<VvZuN
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/** The default constructor */ 1q1jZqno
public Page(){ \A6B,|@
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} |WdPE@P
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/** construct the page by everyPage yD6[\'%
* @param everyPage hzbw>g+
* */ Wh2tNyS
public Page(int everyPage){ v+=BCyT
this.everyPage = everyPage; 3nnJ8zQ
} #3 pb(fbw
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/** The whole constructor */ \K]0JH
public Page(boolean hasPrePage, boolean hasNextPage, FzXJ]H
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int everyPage, int totalPage, ""QP%
int currentPage, int beginIndex){ 'xg
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this.hasPrePage = hasPrePage; %(G* ,
this.hasNextPage = hasNextPage; 2q4<t:!
this.everyPage = everyPage; PO7Lf#9]
this.totalPage = totalPage; /mu*-,aeX
this.currentPage = currentPage; =;&yd';k
this.beginIndex = beginIndex; pK'V9fD5J
} 0aa&m[Mk
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/** ^7KH _t8
* @return M8b;d}XL
* Returns the beginIndex. dIBE!4 V[
*/ >:!X.TG$
publicint getBeginIndex(){ LRG6:&
return beginIndex; &wE%<"aRAl
} o\pVp bB
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/** #PQB(=299P
* @param beginIndex BC<^a )D=
* The beginIndex to set. K8.!_
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*/ |:<f-j7t~
publicvoid setBeginIndex(int beginIndex){ Um-[~-
this.beginIndex = beginIndex; k<{{*
} spPNr
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/** &,CiM0
* @return hL;(C)(
* Returns the currentPage. o,8TDg
*/ Q_X.rUL0w
publicint getCurrentPage(){ &_|#.
return currentPage; )vb*Ef
} zZ323pq
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/** #c?j\Y9nz
* @param currentPage +sUFv)!4
* The currentPage to set. *8_wYYH
*/ bNNr]h8y-
publicvoid setCurrentPage(int currentPage){ fs%.}^kn
this.currentPage = currentPage; doy`C)xI
} DOJ N2{IP
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/** W_8wed:b
* @return {|:;]T"y
* Returns the everyPage. 'd$P`Vw:
*/ PFne+T!2F
publicint getEveryPage(){ 5BKt1%Pg
return everyPage; iJ3e1w$
} s<eb;Z2D
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/** ?9\EN|O^
* @param everyPage tL)t" i
* The everyPage to set. 2Kyl/C,
*/ m?fy^>1
publicvoid setEveryPage(int everyPage){ ZR?yDgL
this.everyPage = everyPage;
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} ft KTnK.
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/** &NK,VB;
* @return S4Ww5G?.
* Returns the hasNextPage. &*G#H~\
*/ >kp?vK;'B
publicboolean getHasNextPage(){ \GZM&Zd
return hasNextPage;
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} fNt`?pWH
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/** A}N?/{y)G
* @param hasNextPage SY^t} A7:/
* The hasNextPage to set. lXiKY@R#
*/ P5nO78
publicvoid setHasNextPage(boolean hasNextPage){ ]?
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this.hasNextPage = hasNextPage; ?_vakJ
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} 2Yn <2U/^R
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/** .=;3d~.]
* @return tlqiXh<
* Returns the hasPrePage. -~30)J=e`
*/ Yc
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publicboolean getHasPrePage(){ jWl)cC
return hasPrePage; lWc:$qnR-K
} )V6Hl@v
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/** C=It* j55
* @param hasPrePage tEK my7'#
* The hasPrePage to set. G) 7;;
*/ TbGn46!:
publicvoid setHasPrePage(boolean hasPrePage){ Dg?70v<a
this.hasPrePage = hasPrePage; JB`\G=PiL
} Q/_f
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/** >>o dZL
* @return Returns the totalPage. OJ$]V,Z00x
* -[!P!d=
*/ *ikc]wQr$
publicint getTotalPage(){ yXF?H"h(
return totalPage;
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} YWe"zz
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/** WIf0z#JMJm
* @param totalPage %_L\z*+
* The totalPage to set. /8g^T")
*/ Q&g^c2
publicvoid setTotalPage(int totalPage){ d%,eZXg'
this.totalPage = totalPage; WKIoS"?-F
} tj4VWJK
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} &twf,8
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