Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 abUO3
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ' *a}*(0OA
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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 wzju)q S
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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 1~K'r&
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分页支持类: ZwLr>?0$
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java代码: \zg R]|
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package com.javaeye.common.util; ~&T U
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import java.util.List; JFX}))7
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publicclass PaginationSupport { upaP,ik}~
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publicfinalstaticint PAGESIZE = 30; Y0|){&PCt
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privateint pageSize = PAGESIZE; C/Z#NP~ *
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privateList items; 99ZWB
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privateint totalCount; N6-7RoA+
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privateint[] indexes = newint[0]; DoQ^caa@
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privateint startIndex = 0; c:.5@eq^
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public PaginationSupport(List items, int r1-MO`6
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totalCount){ TBPu&+3
setPageSize(PAGESIZE); I1':&l^O
setTotalCount(totalCount); AP,ZMpw
setItems(items); E!1\9wzM{
setStartIndex(0); }M% 3
} 0>SA90Q
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public PaginationSupport(List items, int 6#*_d,xQT
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totalCount, int startIndex){ {~O4*2zg;K
setPageSize(PAGESIZE); !5De?OXe
setTotalCount(totalCount);
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setItems(items); #n+u>x.O
setStartIndex(startIndex); iYT?6Y|+
} l#v52
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public PaginationSupport(List items, int J#Y0R"fo
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totalCount, int pageSize, int startIndex){ J1O1! .
setPageSize(pageSize); ($<&H>j0
setTotalCount(totalCount); L3oL>r'|
setItems(items); LqD7SJ}/f
setStartIndex(startIndex); $s}w23nB
} 3AdYZ7J
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publicList getItems(){ sS{Co8EJn
return items; ^wZx=kas
}
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publicvoid setItems(List items){ w?u3e+
this.items = items; jG&HPVr
} \Db`RvEmR
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publicint getPageSize(){ AlDp+"|
return pageSize; +|g*<0T5<
} rQT%~oM:
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publicvoid setPageSize(int pageSize){ e?;c9]XO,o
this.pageSize = pageSize; >%`SXB&9
} N}nE9z5
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publicint getTotalCount(){ ~:{ mKc
return totalCount; H0OO+MCe
} vde!k_,wZ
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publicvoid setTotalCount(int totalCount){ 6B@e[VtG$
if(totalCount > 0){ YBj*c$.D0
this.totalCount = totalCount; yI|x
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int count = totalCount / R%n*wGi_6b
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pageSize; ;&|I/MVm
if(totalCount % pageSize > 0) ]SAY\;,_
count++; qm/>\4eLt
indexes = newint[count]; 2jhJXM=~
for(int i = 0; i < count; i++){ NGi)Lh|
indexes = pageSize * qY%|Uo
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} {ly <%Q7j
}else{ ]m`:T
this.totalCount = 0; ]pB5cq7o
} ^NX;zc
} Q;>Yk_(S
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publicint[] getIndexes(){ AfO.D?4x
return indexes; M]Vi]s
} NL|c5y<r
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publicvoid setIndexes(int[] indexes){ a,4GE'
this.indexes = indexes; _(m455HZ
} v9@_DlV\
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publicint getStartIndex(){ (FGy"o%TP'
return startIndex; H1?C:R
} #'f5owk>,
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publicvoid setStartIndex(int startIndex){ Sx~mc_ekY
if(totalCount <= 0) hunlKIg
this.startIndex = 0; <%wTI<m,-
elseif(startIndex >= totalCount) a"Iu!$&N
this.startIndex = indexes U9PI#TX
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[indexes.length - 1]; MaPhG<?
elseif(startIndex < 0) @6~m&$R/
this.startIndex = 0; UzSDXhzObf
else{ /#{~aCOi)
this.startIndex = indexes O251. hXK
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[startIndex / pageSize]; *^{j!U37s
} ,if~%'9j
} fO5L[U^`
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publicint getNextIndex(){ uIO?4\s&G
int nextIndex = getStartIndex() + 1Ci^e7|?
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pageSize; =ePwGm1:c
if(nextIndex >= totalCount) z7?SuJ
return getStartIndex(); yMkR)HY
else -@w}}BR
return nextIndex; a 01s'9Be
} 89 m.,
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publicint getPreviousIndex(){ 9k62_]w@6
int previousIndex = getStartIndex() - 9i_@3OVl
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pageSize; >2K'!@~'
if(previousIndex < 0) KMfIp:~
return0; 4Hyp]07
else rVOF
return previousIndex; )xg8#M=K
} m7A3i<6p
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} {_4Hsw?s6
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抽象业务类 c"CR_
java代码: o:5mgf7
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/** 7,?ai6{
* Created on 2005-7-12 7|Wst)_~j
*/ ]3]B$
package com.javaeye.common.business; D=D.s)ns*
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import java.io.Serializable; H%=;pD>o
import java.util.List; Xe`$SNM
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import org.hibernate.Criteria; K4|fmgcy.
import org.hibernate.HibernateException; ebL0cK?
import org.hibernate.Session; g=v'[JPd
import org.hibernate.criterion.DetachedCriteria; &,Rye Q
import org.hibernate.criterion.Projections; F|VHr@%
import i 28TH
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org.springframework.orm.hibernate3.HibernateCallback; .;bU["fn)
import ,Bx0
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org.springframework.orm.hibernate3.support.HibernateDaoS (yEU9R$I"
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upport; l%i*.b(
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import com.javaeye.common.util.PaginationSupport; 3S>rc0]6
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public abstract class AbstractManager extends Mz)
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HibernateDaoSupport {
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privateboolean cacheQueries = false; 8<6@O
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privateString queryCacheRegion; %[L/JJbP&Z
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publicvoid setCacheQueries(boolean I&1.}{G>F
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cacheQueries){ {~\:4
this.cacheQueries = cacheQueries; r|bGn#^
} Ka)aBU9
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publicvoid setQueryCacheRegion(String RWDPsZC
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queryCacheRegion){ ^MhMYA
this.queryCacheRegion = B/~ubw
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queryCacheRegion; %vG;'_gMB
} pNQ@aJ
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publicvoid save(finalObject entity){ 5Tidb$L;Du
getHibernateTemplate().save(entity); fo9V&NE
} `J{{E,y
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publicvoid persist(finalObject entity){ :Xx7':5
getHibernateTemplate().save(entity); -=u9>S)!c
} #H8QX5b)
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publicvoid update(finalObject entity){ JV2[jo}0N
getHibernateTemplate().update(entity); PI*Z>VE?
} MpJ3*$Dr
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publicvoid delete(finalObject entity){ $S/WAw,/
getHibernateTemplate().delete(entity); !.q#X^@>L
} wv%UsfD
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publicObject load(finalClass entity, ^zG!Z:E
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finalSerializable id){ "zIQ(|TL?d
return getHibernateTemplate().load )4YtdAV
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(entity, id); kZ^wc .
} WL\*g] K4
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publicObject get(finalClass entity, 5RSP.Vyx{
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finalSerializable id){ sY}0PB
return getHibernateTemplate().get dr"@2=Z
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(entity, id); VhgcvS@V
} q^[SN
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publicList findAll(finalClass entity){ IPY[x|
return getHibernateTemplate().find("from q6
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" + entity.getName());
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} gX5.u9%C\
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publicList findByNamedQuery(finalString {]y!2r
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namedQuery){ SR/
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return getHibernateTemplate s*>B"#En
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().findByNamedQuery(namedQuery); DeN$YE#*
} -K5u5l}
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publicList findByNamedQuery(finalString query, uKT\\1Jrq
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finalObject parameter){ \AD|;tA\vE
return getHibernateTemplate (rf8"T!"
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().findByNamedQuery(query, parameter); #W L>ha
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} `~qVo4V6Z
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publicList findByNamedQuery(finalString query, 8U-<Q>
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finalObject[] parameters){ niCq`!
return getHibernateTemplate sQ82(N7l
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().findByNamedQuery(query, parameters); # 9ZO1\
} )x&>Cf<,
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publicList find(finalString query){ tlmfDQD
return getHibernateTemplate().find `?(9Bl
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(query); +]#pm9
} e]l.m!,r
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publicList find(finalString query, finalObject Biy$p6
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parameter){ 1uc;:N G=
return getHibernateTemplate().find @|7e~U
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(query, parameter); !2=eau^p
} .iEzEmu
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public PaginationSupport findPageByCriteria tp +H]H3
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(final DetachedCriteria detachedCriteria){ x):h|/B
return findPageByCriteria |H-zm&h>'
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); &qeMYYY
} ;c>IM]
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public PaginationSupport findPageByCriteria *5S~@
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(final DetachedCriteria detachedCriteria, finalint -(![xZ1{K
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startIndex){ 2NqO,B|R
return findPageByCriteria pGSS
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(detachedCriteria, PaginationSupport.PAGESIZE, ~@ hiLW
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startIndex); GMoE,L
} g h&,U`
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public PaginationSupport findPageByCriteria Jg%jmI;Y
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(final DetachedCriteria detachedCriteria, finalint Qw/H7fvh&
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pageSize, >[gNQJ6
finalint startIndex){ gLPgh%B4
return(PaginationSupport) s4{ >7`N2
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getHibernateTemplate().execute(new HibernateCallback(){ [5Pin>]z
publicObject doInHibernate 2t"&>1
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(Session session)throws HibernateException { co%-d
Criteria criteria = 6"Rw&3D?
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detachedCriteria.getExecutableCriteria(session); 0N>R!
int totalCount = l)(
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((Integer) criteria.setProjection(Projections.rowCount Kh2!c+Mw
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()).uniqueResult()).intValue(); f^k H[C
criteria.setProjection =GSe$f?
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(null); %13V@'e9
List items = :B]yreg
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criteria.setFirstResult(startIndex).setMaxResults _+2Jc}Yf
O0,=@nw8.
(pageSize).list(); |4|j5<5
PaginationSupport ps = `%S#XJU
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new PaginationSupport(items, totalCount, pageSize, Omy<Y@$
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startIndex); .=<<b|
return ps; ?mJ&zf|B8
} M[7$cfp-Y~
}, true); _mn2bc9M
} ORP-@-dap
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public List findAllByCriteria(final +LsACSB
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DetachedCriteria detachedCriteria){ |(\T;~7'
return(List) getHibernateTemplate @fG'X
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().execute(new HibernateCallback(){ c.eA]m q
publicObject doInHibernate fjm(C#^-
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(Session session)throws HibernateException { jQrw^6C
Criteria criteria = p;<brwN
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detachedCriteria.getExecutableCriteria(session); IG=# 2 /$
return criteria.list(); :J6lJ8w
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} $c<NEt_\
}, true); U[t/40W}P
} bL]NSD
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public int getCountByCriteria(final j0+l-]F-
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DetachedCriteria detachedCriteria){ Kk9W=vd
Integer count = (Integer) p?XVO#
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getHibernateTemplate().execute(new HibernateCallback(){ c}r"O8M
publicObject doInHibernate W 2.Ap
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(Session session)throws HibernateException { A$ Ok^
Criteria criteria = T.?}iz=ZEq
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detachedCriteria.getExecutableCriteria(session); KoKd.%
return G=l-S\0@
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criteria.setProjection(Projections.rowCount ;dVYR=l
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()).uniqueResult(); GP{$w_'!J0
} @m+2e C77
}, true); ::R5F4
return count.intValue(); \qj(`0HG
} SM8Wg>
} 0S71&I$u]
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用户在web层构造查询条件detachedCriteria,和可选的 vA&MJD{
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 j9^V)\6)
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PaginationSupport的实例ps。 hxe X6
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ps.getItems()得到已分页好的结果集 *BFG{P
ps.getIndexes()得到分页索引的数组 PEDV9u[A
ps.getTotalCount()得到总结果数 >PmnR>x-rj
ps.getStartIndex()当前分页索引 S";c7s
ps.getNextIndex()下一页索引 &f($= 68
ps.getPreviousIndex()上一页索引 9mRP%c#(
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ^n~bx*f
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 +LwwI*;b
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一下代码重构了。 =}UcYC6l
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我把原本我的做法也提供出来供大家讨论吧: |e{ ^Yf4
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首先,为了实现分页查询,我封装了一个Page类: =M`Xu#eRk
java代码: E)F#Z=)
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/*Created on 2005-4-14*/ nAaY5s0D
package org.flyware.util.page; xVN(It7g
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/** Tnoy#w}Ve
* @author Joa 7&&3@96<*#
* tE WolO[\
*/ 7A"v:e
publicclass Page { z9Nial`p
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/** imply if the page has previous page */ c"lblt5
privateboolean hasPrePage; QERj`/g
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/** imply if the page has next page */ A9Icn>3?`(
privateboolean hasNextPage; F[KM0t!
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/** the number of every page */ *aW:Z6N
privateint everyPage; QWwdtk
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/** the total page number */ =A{s,UP
privateint totalPage; Pl\NzB,`
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/** the number of current page */ )~-r&Q5d
privateint currentPage; O-&^;]ieJ
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/** the begin index of the records by the current @Y !Jm
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query */ Q6;bORN
privateint beginIndex; =$SvKzN
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/** The default constructor */ MSE0z!t
public Page(){ {t!Pv2y<
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} d<RJH
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/** construct the page by everyPage Fv<3VKueK[
* @param everyPage _N:GZLG
* */ UM2yv6:/
public Page(int everyPage){ =[,EFkU?B
this.everyPage = everyPage; MdhD "Q
} Q zp!)i
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/** The whole constructor */ $Y M(NC
public Page(boolean hasPrePage, boolean hasNextPage, C#n.hgo>I
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int everyPage, int totalPage, B`)TRt+'.
int currentPage, int beginIndex){ \aN7[>R.Q
this.hasPrePage = hasPrePage; *alifdp
this.hasNextPage = hasNextPage; %7[q%S
this.everyPage = everyPage; rvuasr~
this.totalPage = totalPage; =q}Z2 OoYh
this.currentPage = currentPage; Rj3ad 3z'E
this.beginIndex = beginIndex; KAgxIz!^-1
} |$g} &P8;
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/** liMw(F2
* @return N}nE?|N=5
* Returns the beginIndex. o)n=n!A
*/ 7{\6EC}d[&
publicint getBeginIndex(){ ~r_2V$sC2
return beginIndex; $WXO1o(O
} kB.CeG]tk
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/** 2~R%_r+<
* @param beginIndex 5Q\ hd*+g
* The beginIndex to set. wjXv{EsMq
*/ #v; :K8
publicvoid setBeginIndex(int beginIndex){ !v8](UI8-
this.beginIndex = beginIndex; qu&p)*M5
} $]rC-K:Z
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/** Xk!wT2;
* @return >qBJK)LHOv
* Returns the currentPage. -]t>'Q?
*/ 9/_~YY=/h
publicint getCurrentPage(){ Hb/8X
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return currentPage; ]FgKL0
} iBwM]Eyv.
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/** J9MAnYd)i
* @param currentPage Ym.{
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* The currentPage to set. {eVv%sbq
*/ gJ~CD1`O
publicvoid setCurrentPage(int currentPage){ #r/5!*3
this.currentPage = currentPage; @_wJN Qo`
} s
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/** N<b~,[yCd>
* @return Lrmhr3
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* Returns the everyPage. AiB]A}
*/ virt[5w
publicint getEveryPage(){ (\'$$
return everyPage; f[
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} U }AIOtUw
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/** 'j-U=2,n
* @param everyPage jYvl-2A'
* The everyPage to set. Z1Qv>@u
*/ K>C@oE[W
publicvoid setEveryPage(int everyPage){ %w?C)$Kn\
this.everyPage = everyPage; T0~~0G)k
} @1xIph<z
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