Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 J.`.lQ$z
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ~GY;{
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据这一功能,我设计了通用的抽象Bean基类和分页类支持,代码来 #wm)e)2@
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自于Quake Wang的javaeye-core包的相应类,然后又做了很多修改 |s`q+ U -
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分页支持类: i|d41u;@
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java代码: MDCf(LhEH
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package com.javaeye.common.util; FRF}V@~
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import java.util.List; <*5D0q#~"
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publicclass PaginationSupport { WK^qYfq|
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publicfinalstaticint PAGESIZE = 30; 6qA{l_V
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privateint pageSize = PAGESIZE; 5Q'R5]?h
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privateList items; |Z/ySAFM
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privateint totalCount; jH G(d$h
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privateint[] indexes = newint[0]; FxT
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privateint startIndex = 0; WL~`L!_. A
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public PaginationSupport(List items, int %?$"oWmenS
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totalCount){ 8+ W^t I
setPageSize(PAGESIZE); g/yXPzLU
setTotalCount(totalCount); G j:|
setItems(items); n#fg7d%
setStartIndex(0); x"d*[m
} ^YZ#P0 y
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public PaginationSupport(List items, int <Jk|Bmw;
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totalCount, int startIndex){ j?(QieBH
setPageSize(PAGESIZE); ~!OjdE!u
setTotalCount(totalCount); oAx0$]+%V)
setItems(items); RinRQd
setStartIndex(startIndex); ~}11 6K
} Cu:-<
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public PaginationSupport(List items, int L$Q+R'
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totalCount, int pageSize, int startIndex){ :[&X*bw[
setPageSize(pageSize); x@ O:
setTotalCount(totalCount); cG'Wh@
setItems(items); {m?x},
setStartIndex(startIndex); o5R\7}]GE
} zl[JnVF\6
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publicList getItems(){ uI[*uAR
return items; BSY#xe V
} 4Ojw&ys@V
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publicvoid setItems(List items){ ,L;vN6~
this.items = items; wGH@I_cy>
} e{,/
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publicint getPageSize(){ v#FUD-Z
return pageSize; 5PPpX =\
} :6+~"7T
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publicvoid setPageSize(int pageSize){ /["T#`
this.pageSize = pageSize; %U7B0-
} Ul
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publicint getTotalCount(){ P$Q&xN<#)
return totalCount; M}Mzm2d#`
} %"zJsYQ!
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publicvoid setTotalCount(int totalCount){ Ah6x2(:
if(totalCount > 0){ pg)g&ifKl
this.totalCount = totalCount; $ Zr,-
int count = totalCount / v2{s2kB=
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pageSize; ErC[Zh"''
if(totalCount % pageSize > 0) aw1J#5j`n
count++; ay4xOwcR
indexes = newint[count]; |5Pbc&mH8A
for(int i = 0; i < count; i++){ ]w>fnew
indexes = pageSize * <*(R+to^d
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i; }HorR2(`N
} N~jQ!y
}else{ ".?{Y(~
this.totalCount = 0; H@'
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} ;7k7/f:
} KCE-6T
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publicint[] getIndexes(){ J
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return indexes;
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} P*Sip?tdE
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publicvoid setIndexes(int[] indexes){ wf%Ep#^6}
this.indexes = indexes; W2qQKv
} RJ4mlW
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publicint getStartIndex(){ bU`yymf{L
return startIndex; 8 {%9%{
} #9VY[<
@!3^/D3
publicvoid setStartIndex(int startIndex){ , vyx`wDd
if(totalCount <= 0) -U[`pUY?f
this.startIndex = 0; G| oG:
elseif(startIndex >= totalCount) $#3<rcOq
this.startIndex = indexes g8A{aHb1}
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[indexes.length - 1]; B
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elseif(startIndex < 0) h\\2r>
this.startIndex = 0; B-'BJ|*4I
else{ 6D"`FPC
this.startIndex = indexes |o=ST
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[startIndex / pageSize]; 1e&b;l'*=
} !&p:=}s
} sNmC#,
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publicint getNextIndex(){ 00a<(sS;
int nextIndex = getStartIndex() + t0d '>
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pageSize; ^i)Q
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if(nextIndex >= totalCount) *Ne2l`!1m
return getStartIndex(); JD`;,Md
else `+BaDns
return nextIndex; bK$D lBZ
} ~V"cLTj"
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publicint getPreviousIndex(){ 8kM0
int previousIndex = getStartIndex() - A6 y~_dt
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pageSize; q=%
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if(previousIndex < 0) XAxI?y[c
return0; Yn]yd1
else I+j|'=M
return previousIndex; vJAAAS
} pMZf!&tM
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} })Mv9~&S
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抽象业务类 <Dj$0g
java代码: HZ<f(
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/** | ]!Ky[P
* Created on 2005-7-12 .6 ?>t!&W
*/ uyRA`<&w
package com.javaeye.common.business; G9y12HV
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import java.io.Serializable; r|\'9"@
import java.util.List; :UDn^(#
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import org.hibernate.Criteria; _?]BVw
import org.hibernate.HibernateException; V3A>Ag+^~
import org.hibernate.Session; kGuk
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import org.hibernate.criterion.DetachedCriteria; +`s&i%{1>
import org.hibernate.criterion.Projections; Z(k\J|&9C
import 4lh
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org.springframework.orm.hibernate3.HibernateCallback; m~j\?mb{+
import mQ^@ \s
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org.springframework.orm.hibernate3.support.HibernateDaoS KIAe36.~
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upport; ? __aVQ7
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import com.javaeye.common.util.PaginationSupport; iy.%kHC
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public abstract class AbstractManager extends ]zvVY:v
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HibernateDaoSupport { Dd5xXs+c
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privateboolean cacheQueries = false; (+gL#/u
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privateString queryCacheRegion; ~[uV
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publicvoid setCacheQueries(boolean te\h?H
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cacheQueries){ .W@(nQ-<
this.cacheQueries = cacheQueries; m,@1LwBH
} $p0 /6c
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publicvoid setQueryCacheRegion(String 0 .FHdJ<
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queryCacheRegion){ W<rTq0~$?
this.queryCacheRegion = (!0j4'
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queryCacheRegion; Wiq{wxe
} b@2Cll#
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publicvoid save(finalObject entity){ 0~Iu7mPY
getHibernateTemplate().save(entity); %K%^ ]{
} @ kJ0K
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publicvoid persist(finalObject entity){ tIGVB+g{F
getHibernateTemplate().save(entity); 2<[eD`u
} <DeKs?v
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publicvoid update(finalObject entity){ 2/v35| ?
getHibernateTemplate().update(entity); S]e j=6SP
} E7X!cm/2<
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publicvoid delete(finalObject entity){ ocIt@#20K
getHibernateTemplate().delete(entity); 6%gB
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} p{ @CoOn
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publicObject load(finalClass entity, F-BJe]
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finalSerializable id){ >H0) ph
return getHibernateTemplate().load *'9)H0
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(entity, id); <i_>
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} j>0<#SYBu
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publicObject get(finalClass entity, 10C 2=
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finalSerializable id){ ] vC=.&]
return getHibernateTemplate().get |Z`M*.d+
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(entity, id); <u/a`E?
} [_y9"MMwn
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publicList findAll(finalClass entity){ X}oj_zsy;^
return getHibernateTemplate().find("from nE/=:{~Ws
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" + entity.getName()); -"W )|oC_
} _ Ry_K3K
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publicList findByNamedQuery(finalString rr |"r
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namedQuery){ 9pWi.J
return getHibernateTemplate cu[!D}tVU
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().findByNamedQuery(namedQuery); \'n$&PFe
} puFXPw.3
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publicList findByNamedQuery(finalString query, QJx9I_
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finalObject parameter){ mJ)tHv"7
return getHibernateTemplate `5~7IPl3
rmOQ{2}
().findByNamedQuery(query, parameter); 7^ 4jcfJH
} }o-|8P:Y
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publicList findByNamedQuery(finalString query, as>:\hjP##
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finalObject[] parameters){ b.QpHrnhtK
return getHibernateTemplate TbOJp
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().findByNamedQuery(query, parameters); Z.!g9fi8>
} @gNpJB]V
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publicList find(finalString query){ x_yF|]aI!
return getHibernateTemplate().find :]'q#$!
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(query); &]w#z=5SXi
} y =R
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publicList find(finalString query, finalObject PNf&@
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parameter){ 't7Z] G
return getHibernateTemplate().find 29%=: *R$
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(query, parameter); J==}QEhQ{
} D}MoNE[r
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public PaginationSupport findPageByCriteria {B3(HiC
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(final DetachedCriteria detachedCriteria){ 6z Ay)~
return findPageByCriteria *%X.ym'
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); (v!mR+\x
} :<|Z.4}kJb
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public PaginationSupport findPageByCriteria M+0x;53nz
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(final DetachedCriteria detachedCriteria, finalint RK-x?ZYH'
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startIndex){ /l^y}o %?
return findPageByCriteria
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NP
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(detachedCriteria, PaginationSupport.PAGESIZE,
//<:k8
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startIndex); eES'}[W>
}
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public PaginationSupport findPageByCriteria +C_*Vs@4
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(final DetachedCriteria detachedCriteria, finalint 8"i/wMP]
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pageSize, 4:U0f;Fs
finalint startIndex){ ^!}F%
return(PaginationSupport) 9:-T@u
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getHibernateTemplate().execute(new HibernateCallback(){ ,Aj }]h\L
publicObject doInHibernate .b,~f
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(Session session)throws HibernateException { n'?4.tb
Criteria criteria = IcFK,y%1
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detachedCriteria.getExecutableCriteria(session); b+Vi3V
int totalCount = n+?-
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((Integer) criteria.setProjection(Projections.rowCount hM>*a!)U
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()).uniqueResult()).intValue(); 4gOgWBv
criteria.setProjection BSKEh"f
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(null); > rw"Rd'
List items = O&V[g>x"U
vLDi ;
criteria.setFirstResult(startIndex).setMaxResults [D[D`gpjA
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(pageSize).list(); fK_~lGY(
PaginationSupport ps = sJ~P:g
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new PaginationSupport(items, totalCount, pageSize, U:n*<l-k}
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startIndex); Q#pnj thM
return ps; x:
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} y(v_-6b
}, true); Dtt-|_EMS
} +"uwV1)b"
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public List findAllByCriteria(final fY_%33_I$
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rv
DetachedCriteria detachedCriteria){ )6{P8k4Zr
return(List) getHibernateTemplate JIxiklk
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().execute(new HibernateCallback(){ "IwM:v
publicObject doInHibernate $.:3$et@/
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(Session session)throws HibernateException { CH;;V3
Criteria criteria = 4AHL3@x
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detachedCriteria.getExecutableCriteria(session); fsvYU0L
return criteria.list(); w$>3pQ8d
} Rd%0\ B
}, true); ezZph"&
} 4j3oT)+8
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public int getCountByCriteria(final >^3zU
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DetachedCriteria detachedCriteria){ l1<?ONB.#
Integer count = (Integer) m r4b
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getHibernateTemplate().execute(new HibernateCallback(){ g.a| c\WH
publicObject doInHibernate *]x_,:R6Ow
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(Session session)throws HibernateException { ce' TYkPM
Criteria criteria = O,mip
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detachedCriteria.getExecutableCriteria(session); p)/
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return e<5Y94YE
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criteria.setProjection(Projections.rowCount 254~:eB0
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()).uniqueResult(); p4wr`"Zz
} !kXeO6X@m
}, true); JD~a UB%
return count.intValue(); ;fGx;D
} %MJ;Q?KB
} (X}@^]lpa
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用户在web层构造查询条件detachedCriteria,和可选的 HFS+QwHW
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ^\wl2
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PaginationSupport的实例ps。 1r571B*O
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ps.getItems()得到已分页好的结果集 [rdsv
ps.getIndexes()得到分页索引的数组 ZnXejpj)D
ps.getTotalCount()得到总结果数 arh@`'Q
ps.getStartIndex()当前分页索引 Kt
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ps.getNextIndex()下一页索引 2F?kjg,
ps.getPreviousIndex()上一页索引 TnE+[.Qu
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 QzthTX<
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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 nNn56&N]
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一下代码重构了。 JJf<*j^G
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我把原本我的做法也提供出来供大家讨论吧: &" h]y?Q
#`/QOTnm2c
首先,为了实现分页查询,我封装了一个Page类: b!a
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java代码: (pYYkR"
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/*Created on 2005-4-14*/ 3Gd0E;3sk~
package org.flyware.util.page; FH\CK
. U/k<v<)6
/** y1,5$0@G
* @author Joa h%1Y6$
* M|%c(K#E,3
*/ ?`P2'i<b
publicclass Page { s4t0f_vj`
?q Xs-
/** imply if the page has previous page */ _D-Riu>#J
privateboolean hasPrePage; !N~*EI$
bK=c@GXS
/** imply if the page has next page */ Y'N'hRD
privateboolean hasNextPage; \4s;!R!
] !Zty[
/** the number of every page */ h4 vm{ho
privateint everyPage; M#M?1(O/NE
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/** the total page number */ abWl ut
privateint totalPage; }ND'0*#
MY F#A
/** the number of current page */ )w"0w(
privateint currentPage; ;.s:X
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/** the begin index of the records by the current yXF|Sqv
ma]?
)1<{
query */ ct0v$ct>f
privateint beginIndex; z5EVG
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/** The default constructor */ @ER1zKK?
public Page(){ ;r!\-]5$
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} jG8;]XP
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/** construct the page by everyPage {!=2<-Aq
* @param everyPage :[?!\m%0
* */
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public Page(int everyPage){ NI\H
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this.everyPage = everyPage; F5IZ"Itu(
} S=O$JP79
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/** The whole constructor */ J @B4
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public Page(boolean hasPrePage, boolean hasNextPage, ) `I=oB
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int everyPage, int totalPage, HRHrSf7
int currentPage, int beginIndex){ *?N<S$m
this.hasPrePage = hasPrePage; vYzVY\
this.hasNextPage = hasNextPage; C1 {ZW~"YI
this.everyPage = everyPage; if@,vc
this.totalPage = totalPage; ]fC7%"nB
this.currentPage = currentPage; {8:o?LnMW
this.beginIndex = beginIndex; *w 21U!
} mJ$Htyr
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/** ;eh/_hPM
* @return hVZo"XUb
* Returns the beginIndex. 0n5!B..m}
*/ 4\1;A`2%0
publicint getBeginIndex(){ N 8}lt
return beginIndex; G>0)I
} {]["6V6W
C8MWIX}
/** -<d(
* @param beginIndex pK"&QPv
* The beginIndex to set. Bb_Q_<DTs
*/ xgs@gw7!n0
publicvoid setBeginIndex(int beginIndex){ 6$(0Ty
this.beginIndex = beginIndex; 0etwz3NuW
} Yj3*)k
+"Ub/[J{G1
/** pz @km
* @return j"6:A
* Returns the currentPage. 2_N/wR#=&
*/ K @C4*?P
publicint getCurrentPage(){ tj0Qr-/
return currentPage; +,wWhhvlzv
} !l"tI#?6W%
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/** QES^^PQe:
* @param currentPage UAKu_RO6S
* The currentPage to set. -xTKdm
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*/ vG3M5G
publicvoid setCurrentPage(int currentPage){ gi 5XP]z
this.currentPage = currentPage; ^Rk^XQCh
} _T
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/** Tplg2p%k
* @return ?cJA^W
* Returns the everyPage. M#T#:wf~
*/ :fW.-^"VP
publicint getEveryPage(){ &~}@u[=ux
return everyPage; {yU0D*#6
} /D8EI
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/** s" N\82z)
* @param everyPage UtPwWB_YV
* The everyPage to set. c`pYc
*/ pSXEJ 2k
publicvoid setEveryPage(int everyPage){ s_S$7N`ocS
this.everyPage = everyPage; [lZ=s[n.
} p_;r%o=
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/**
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* @return cX Ma\#P
* Returns the hasNextPage. \D ^7Z97
*/ =~
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publicboolean getHasNextPage(){ #'wL\3
return hasNextPage; 1j+eD:d'
} l*qk1H"g
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/** dt0T t
* @param hasNextPage \Me"'.F?
* The hasNextPage to set. l-XnB
*/ d;<.;Od$`
publicvoid setHasNextPage(boolean hasNextPage){ 16L"^EYq
this.hasNextPage = hasNextPage; X&/(x
} ~RAzFLt6x
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/** G$|G w
* @return *XHj)DC;
* Returns the hasPrePage. L-j/R1fTvl
*/ M.X}K7Z_/
publicboolean getHasPrePage(){ K[n<+e;G
return hasPrePage; )Gmb?!/^
} i:;$oT
v [dAywW
/** Z`|> tbOfZ
* @param hasPrePage 1]HHe*'Z
* The hasPrePage to set. nM=2"`@$
*/ Oxpo6G
publicvoid setHasPrePage(boolean hasPrePage){ $x/J+9Ww
this.hasPrePage = hasPrePage; C"k2<IE
} \
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/** r}Ltv?4
* @return Returns the totalPage. 2m|Eoc&M_
* N!]PIWnC
*/ /nwxuy
publicint getTotalPage(){ :{x!g6bK@
return totalPage; p!C_:Z5i
} j)<;g(
7?+5%7-
/** 3/SfUfWo
* @param totalPage S_a :ML<
* The totalPage to set. "0!~g/X`rK
*/ F@B
publicvoid setTotalPage(int totalPage){ MiRibHXI,
this.totalPage = totalPage; ,G/\@x%
} zuK/(qZ
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} +oE7~64LL
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上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 VaOpO8y`
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个PageUtil,负责对Page对象进行构造:
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java代码: =>gyc;{2K<
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/*Created on 2005-4-14*/ 9O(i+fM
package org.flyware.util.page; tI/mE[W
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import org.apache.commons.logging.Log; s:-8 Z\,
import org.apache.commons.logging.LogFactory; ]#vvlM>/
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/** .=.yZ
* @author Joa o=mq$Z:}
* Dme(Knly
*/ ">0/>>Ry
publicclass PageUtil { F{a0X0ru~
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privatestaticfinal Log logger = LogFactory.getLog clPZd
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(PageUtil.class); .FfwY 'V
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/** 3&drof\{
* Use the origin page to create a new page <> &e/
* @param page l<0[ K(
* @param totalRecords Pj1K
* @return ')1}#V/I
*/ F^ %{
;
publicstatic Page createPage(Page page, int }J'5EAp
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totalRecords){ <3],C)Zwc
return createPage(page.getEveryPage(), U5@TaGbx
"NXm\`8
page.getCurrentPage(), totalRecords); YW4bm
} d[P>jl%7
eMpEFY
/** b]tA2~e
* the basic page utils not including exception )<]w23i
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handler s)o,Fi
* @param everyPage
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* @param currentPage web8QzLLB
* @param totalRecords WacU@L $A
* @return page ..Uw8u/
*/ ^J#*n;OQ3A
publicstatic Page createPage(int everyPage, int -Fok%iQ'5
@gu77^='
currentPage, int totalRecords){ |)!k@?_
everyPage = getEveryPage(everyPage); 2RSHBo
currentPage = getCurrentPage(currentPage); =yhn8t7@]
int beginIndex = getBeginIndex(everyPage, U4^p({\|-
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currentPage); 1K*f4BnDr~
int totalPage = getTotalPage(everyPage, <De3mZb
K,L>
totalRecords); ~Hyyq-
boolean hasNextPage = hasNextPage(currentPage, -UD~>s
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totalPage); bHWvKv+
boolean hasPrePage = hasPrePage(currentPage); K#6`LL m
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returnnew Page(hasPrePage, hasNextPage, UVoLHd
everyPage, totalPage, 23u1nU[0
currentPage, z7.C\l
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beginIndex); jN'fm
} zoJkDr=jn
:zn ?<(sQ
privatestaticint getEveryPage(int everyPage){ 8NF;k5
return everyPage == 0 ? 10 : everyPage; h2/1S{/n]
} yZ(Nv $[5
n%MYX'0
privatestaticint getCurrentPage(int currentPage){ 5S-o
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return currentPage == 0 ? 1 : currentPage; sKB-7
} ! MF"e|W
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privatestaticint getBeginIndex(int everyPage, int sWZtbW;)
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currentPage){ g`5`KU|
return(currentPage - 1) * everyPage; >y06s{[
} W1vAK
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privatestaticint getTotalPage(int everyPage, int XdIVMXLL\
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totalRecords){ divZJc
int totalPage = 0; neY=:9
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if(totalRecords % everyPage == 0) 'B<qG<>
totalPage = totalRecords / everyPage; M?4r 5R
else eze(>0\f
totalPage = totalRecords / everyPage + 1 ; a_iQlsU
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return totalPage; k\thEEVP0*
} /HJ(Wt
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privatestaticboolean hasPrePage(int currentPage){ Nj@?}`C 4
return currentPage == 1 ? false : true; !9<RWNKV)Y
} Ccd7|L1
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privatestaticboolean hasNextPage(int currentPage, d_7Xlp@
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int totalPage){ F?,&y)ri
return currentPage == totalPage || totalPage ==
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0 ? false : true; jnKM6%z
} a4CNPf<$
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} u+gXBU
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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。 1o8"==n%
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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 ._8cJf.ae
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做法如下: Y&