Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 e"2x!(&n(
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 =e6!U5
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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 (. ,{x)H
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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 <H1e+l{8$
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分页支持类: fqol-{F.V
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java代码: qmnW
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package com.javaeye.common.util; cP0(Q+i7
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import java.util.List; 2{L[D9c/6
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publicclass PaginationSupport { jgw+c3^R_
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publicfinalstaticint PAGESIZE = 30; QO|jdlg
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privateint pageSize = PAGESIZE; C7Hgzc|U
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privateList items; hrbeTtqi
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privateint totalCount; )KY U[
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privateint[] indexes = newint[0]; =&vRT;6
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privateint startIndex = 0; {.UK{nA?sm
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public PaginationSupport(List items, int m9aP]I3g]\
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totalCount){ v/3Vsd
setPageSize(PAGESIZE); U[!wu]HMF
setTotalCount(totalCount); }z2K"eGt
setItems(items); ]tEH `Kl
setStartIndex(0); o(xt%'L`t
} IPnx5#eB
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public PaginationSupport(List items, int M,P:<-J
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totalCount, int startIndex){ w{Y:p[}
setPageSize(PAGESIZE); rVnolA*%
setTotalCount(totalCount); SJ:Wr{ Or3
setItems(items); 0U:9&jP,
setStartIndex(startIndex); &>hln<a>
} `mKK1x
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public PaginationSupport(List items, int ~"vRH
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totalCount, int pageSize, int startIndex){ Za1VJ5-
setPageSize(pageSize); H=_k|#/
setTotalCount(totalCount); {s[,CUL0
setItems(items); .A<n2-
setStartIndex(startIndex); G~Fjla\?Q
} rcjj(
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publicList getItems(){ s|C4Jy_
return items; M{U7yE6*j*
} x% Eu.jj
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publicvoid setItems(List items){ u_ym=N57`
this.items = items; 5> =Ia@I
} gz"I=9
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publicint getPageSize(){ QgW4jIbx
return pageSize; a(eUdGJ
} nsV;6^>
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publicvoid setPageSize(int pageSize){ Twr<MXa
this.pageSize = pageSize; 2sXX0kq~V
} +J%9%DqF
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publicint getTotalCount(){ WiclG8l
return totalCount; $ ~2qEe.h
} ai(J%"D"
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publicvoid setTotalCount(int totalCount){ x-ShY&k
if(totalCount > 0){ s4Z5t$0|
this.totalCount = totalCount; `$N AK
int count = totalCount / L\H,cimN
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pageSize; M}tr*L
if(totalCount % pageSize > 0) hKYA 5]
count++; JGKiVBN
indexes = newint[count]; IH0qx_;P&
for(int i = 0; i < count; i++){ )]C7+{ImC
indexes = pageSize * I:%O`F
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i; M `bEnu
} l*C(FPw4
}else{ ^ G(GjW8
this.totalCount = 0; H0\5a|X-
} WD,iY_'7u^
} gsp|?)]x
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publicint[] getIndexes(){ _,;|,
return indexes; ~Fd<d[b?
} eZ~ZWb, %
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publicvoid setIndexes(int[] indexes){ ?-IjaDC}
this.indexes = indexes; 'X(G><R9
} X(ZouyD<
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publicint getStartIndex(){ Y!|*`FII
return startIndex; <UcbBcW,
} }^
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publicvoid setStartIndex(int startIndex){ -I#1xJU
if(totalCount <= 0) Lg[_9`\
this.startIndex = 0; h tn?iLq
elseif(startIndex >= totalCount) ]OKs65
this.startIndex = indexes RwC1C(ZP
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[indexes.length - 1]; e8"?Qm7 J
elseif(startIndex < 0) REvY`
this.startIndex = 0; Cp2$I<T
else{ @<
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this.startIndex = indexes ^q0Ox&X
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[startIndex / pageSize]; [LJ1wBMw
} T};fy+iq
} E#=slj@
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publicint getNextIndex(){ `kdP)lI
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int nextIndex = getStartIndex() + k )T;WCia
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pageSize; g&30@D"
if(nextIndex >= totalCount) Gmi$Nl!~
return getStartIndex(); oX9rpTi
else wv8WqYV
return nextIndex; KC-q]
} *VFUC:
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publicint getPreviousIndex(){ (Wu_RXfCw_
int previousIndex = getStartIndex() - Q!<b"8V]
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pageSize; KXP^F6@l
if(previousIndex < 0) +)4_1i4"x
return0; ( &U8NeWZ
else {Y! -]_5
return previousIndex; k]=Yi;
} $6a55~h|(
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} u^T{sQ"_
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抽象业务类 csV.AN'obq
java代码: U[b$VZ}
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/** mV0.9pxS
* Created on 2005-7-12 09{B6l6P
*/ n)(E 0h
package com.javaeye.common.business; 4{d!}R
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import java.io.Serializable; 85<zl|ZD
import java.util.List; P7;=rSW
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import org.hibernate.Criteria; (q!tI*}
import org.hibernate.HibernateException; |7V:~MTkk&
import org.hibernate.Session; Xx~XW^lsh
import org.hibernate.criterion.DetachedCriteria; RSLMO8
import org.hibernate.criterion.Projections; Jp<Y2-
import TM8WaH
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org.springframework.orm.hibernate3.HibernateCallback; 8lo /BGxS>
import {]aB3
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org.springframework.orm.hibernate3.support.HibernateDaoS \h DH81L
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upport; p-H q\DP
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import com.javaeye.common.util.PaginationSupport; XAV|xlfm
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public abstract class AbstractManager extends QQ4
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HibernateDaoSupport { 8kz7*AO
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privateboolean cacheQueries = false; ]:B|_|H
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privateString queryCacheRegion; wD-(3ZVd4
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publicvoid setCacheQueries(boolean Z?H#=|U
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cacheQueries){ `k}
this.cacheQueries = cacheQueries; 85P7I=`*d
} T/#$44ub
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publicvoid setQueryCacheRegion(String ;Zb+WGyj
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queryCacheRegion){ jrGVC2*rD
this.queryCacheRegion = 'OKDB7Ni
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queryCacheRegion; beyC't
} Farcd!}
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publicvoid save(finalObject entity){ 8v7;{4^
getHibernateTemplate().save(entity); 2YD;Gb[8
} io_4d2uBh
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publicvoid persist(finalObject entity){ J+3PUfg>@R
getHibernateTemplate().save(entity); 20G..>zW
} Z[Gs/D
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publicvoid update(finalObject entity){ IT a8*Myj
getHibernateTemplate().update(entity); 4@D 8{?$~Q
} P>/n!1c
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publicvoid delete(finalObject entity){ A+Nf]([
getHibernateTemplate().delete(entity); U$j*{`$4
} W8:?y*6
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publicObject load(finalClass entity, ?:(BkY,K5
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finalSerializable id){ /79_3;^
return getHibernateTemplate().load ^NB@wuf7
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(entity, id); Iy\{)+}aS
} FI1R7A
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publicObject get(finalClass entity, q| p6UL9
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finalSerializable id){ 6$TE-l
return getHibernateTemplate().get KUG\C\z6=
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(entity, id); irSdqa/
} 7@R;lOzL3
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publicList findAll(finalClass entity){ l$$N~F N
return getHibernateTemplate().find("from VU7x w
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" + entity.getName()); R9X*R3nB
} , &S:(b[D
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publicList findByNamedQuery(finalString )jbYWR*&
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namedQuery){ L4I1n l
return getHibernateTemplate zG|}| //}
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().findByNamedQuery(namedQuery); (P
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} x/Pi#X m
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publicList findByNamedQuery(finalString query, nlaJ
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finalObject parameter){ KN>U6=WN
return getHibernateTemplate \(Uw.ri
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().findByNamedQuery(query, parameter); z}v6!u|iZu
} F%!ZHE7
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publicList findByNamedQuery(finalString query, #gbJ$1s
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finalObject[] parameters){ J_A+)_
return getHibernateTemplate Vt-D8J\A
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().findByNamedQuery(query, parameters); $
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} e*w2u<HP
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publicList find(finalString query){ vy?Zz<c;
return getHibernateTemplate().find 6;g_}Zx
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(query); >]?!c5=
} T0xU}
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publicList find(finalString query, finalObject sqw^Hwy=!2
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parameter){ ]9]cef=h#
return getHibernateTemplate().find eyK=F:GO
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(query, parameter); <`8l8cL
} %;+Q0
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public PaginationSupport findPageByCriteria i;!#:JX
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(final DetachedCriteria detachedCriteria){ D_fgxl
return findPageByCriteria ,B]kX/W
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); C<Q;3w`#1j
} Tl9KL%9
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public PaginationSupport findPageByCriteria {?c`0C
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(final DetachedCriteria detachedCriteria, finalint *I7$\0Q
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startIndex){ yD6lzuk{X
return findPageByCriteria uY+N163i
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(detachedCriteria, PaginationSupport.PAGESIZE, P+r-t8
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startIndex); 71i".1l{K
} t>[K:[0U
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public PaginationSupport findPageByCriteria I9GRSm;0<
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(final DetachedCriteria detachedCriteria, finalint r:u,
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pageSize, (orO=gST-/
finalint startIndex){ S'"(zc3=
return(PaginationSupport) __jFSa`at
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getHibernateTemplate().execute(new HibernateCallback(){ L=zt\L
publicObject doInHibernate 0KknsP7
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(Session session)throws HibernateException { n~xh
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Criteria criteria = o'S&YD
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^
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detachedCriteria.getExecutableCriteria(session); -xi]~svg
int totalCount = ghq#-N/t
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((Integer) criteria.setProjection(Projections.rowCount VY }?Nb<&
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()).uniqueResult()).intValue(); ?rqU&my S
criteria.setProjection bN-ljw0&
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(null); > D:(HWL
List items = GY9CU=-
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criteria.setFirstResult(startIndex).setMaxResults FbRq h|
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(pageSize).list(); xf/
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PaginationSupport ps = *3_@#Uu7
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new PaginationSupport(items, totalCount, pageSize, qF!oP
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startIndex); kae&,'@JF
return ps; 6\4~&+;wL
} z)$X/v
}, true); Y{~[N y E
} 78't"2>
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public List findAllByCriteria(final `em}vdY
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DetachedCriteria detachedCriteria){ QAiont ,!
return(List) getHibernateTemplate 5x";}Vp>P
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().execute(new HibernateCallback(){ ^F@z+q
publicObject doInHibernate /DPD,bA
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(Session session)throws HibernateException { Zi$v- b*<
Criteria criteria = $@y<.?k>UP
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detachedCriteria.getExecutableCriteria(session); hVPSW# .d
return criteria.list(); uH'n.d"WG
} tY=sl_
}, true); U#3Y3EdF<
} jr$]kLY
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public int getCountByCriteria(final :sD/IM",},
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DetachedCriteria detachedCriteria){ A1`y_
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Integer count = (Integer) =<nx[J
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getHibernateTemplate().execute(new HibernateCallback(){ A|!u`^p
publicObject doInHibernate %hcn|-"F
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(Session session)throws HibernateException { KtWn08D!
Criteria criteria = 5(F @KeH>
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detachedCriteria.getExecutableCriteria(session); :_R[@?c
return X.)caF^j
x|
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criteria.setProjection(Projections.rowCount tE"aNA#=
X"yjsk
()).uniqueResult(); x^_(gve:
} JVO,@~~
}, true); (<RZZ{m
return count.intValue(); {<XPE:1>Y
} =b+W*vUAw
} nqX)+{wAXe
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用户在web层构造查询条件detachedCriteria,和可选的 sB|>\O#-
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 wBr$3:
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PaginationSupport的实例ps。 o#wDA0T
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ps.getItems()得到已分页好的结果集 SF?Ublc!
ps.getIndexes()得到分页索引的数组 *`
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ps.getTotalCount()得到总结果数 I7!+~uX
ps.getStartIndex()当前分页索引 /Yk4%ZJ{
ps.getNextIndex()下一页索引 US<bM@[
ps.getPreviousIndex()上一页索引 Gt9(@USK
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 EyJWi<
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 #:E}Eby/6I
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一下代码重构了。 5#Z> }@/
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我把原本我的做法也提供出来供大家讨论吧: &DnX6%2
RLuA^ONI
首先,为了实现分页查询,我封装了一个Page类: X%iiz
java代码: Oj6PmUK4
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/*Created on 2005-4-14*/ #SNwSx&
package org.flyware.util.page; Ja$Ple*XU8
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/** ]xhZJ~"@u
* @author Joa
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* TFrZ+CcWp2
*/ MfzSoxCb
publicclass Page { 3LT[?C]H$
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/** imply if the page has previous page */ ,{{e'S9cy
privateboolean hasPrePage; :u}FF"j
\F_~?$
/** imply if the page has next page */ -oSfp23u
privateboolean hasNextPage; mJjd2a"vi
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/** the number of every page */ =uM2l
privateint everyPage; xl.iI$P
R*m=V{iu`
/** the total page number */ :el]IH
privateint totalPage;
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/** the number of current page */ Q>`|{m
privateint currentPage; 8t{-
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/** the begin index of the records by the current '`.bmiM
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query */ P2lDi!q|
privateint beginIndex; v;!f
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/** The default constructor */ 7#\\Ava$T
public Page(){ 51:NL[[6
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} nYfZ[Q>v
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/** construct the page by everyPage Knd2s~S
* @param everyPage G5JZpB#o
* */ {yPJYF_l
public Page(int everyPage){ 8KQD
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this.everyPage = everyPage; &<Gs@UX~w
} MoIq)5/
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/** The whole constructor */ T@V<J'
public Page(boolean hasPrePage, boolean hasNextPage, (]*otVJ
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int everyPage, int totalPage, s@Q,
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int currentPage, int beginIndex){ _FG?zE
this.hasPrePage = hasPrePage; ^Q)&lxlxpx
this.hasNextPage = hasNextPage; <,r(^Ntz
this.everyPage = everyPage; G}MJWf Hl
this.totalPage = totalPage; l$j/Ye]
this.currentPage = currentPage; f$\gm+&hXE
this.beginIndex = beginIndex; r-Nv<oH;
} ~7$NVKE
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/** =D 1%-ym
* @return Hchh2
* Returns the beginIndex. Sb9O#$89
*/ bf9LR1
publicint getBeginIndex(){ "mBX$t'gb
return beginIndex; "YUh4uZ~P
} -F&4<\=+
1 uKWvp0\
/** o;d><
* @param beginIndex #!a}ZhIt
* The beginIndex to set. fu}ZOPu
*/ +W{ELdup%q
publicvoid setBeginIndex(int beginIndex){ Het5{Yb.
this.beginIndex = beginIndex; h[%t7qo=
} 3%"r%:fQB/
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/** @vy{Q7aM
* @return z?9vbx
* Returns the currentPage. BKiyog
*/ Y|NL #F
publicint getCurrentPage(){ 8efQ-^b.
return currentPage; /hNZ7\|P
} vMDX
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/** w=ZSyT-i
* @param currentPage 4P1<Zi+<
* The currentPage to set. n/>^!S
*/ [;rty<Z^b
publicvoid setCurrentPage(int currentPage){ ^e<"`e
this.currentPage = currentPage; IW Ro$Yu
} "r:i
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/** XOk0_[
* @return WAzYnl'p
* Returns the everyPage. >?pWbL
*/ =vqy5y
publicint getEveryPage(){ m1](f[$
return everyPage; ]Wn^m+
} ?1+JBl~/d
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/** Rh=,]Y
* @param everyPage fR:BF47
* The everyPage to set. o$S/EZ
*/ k^x[(gw
publicvoid setEveryPage(int everyPage){ }D/O cp~o
this.everyPage = everyPage; \.@fAgv
} __F?iRrCM
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/** >u6*P{;\
* @return tA*hh"9
* Returns the hasNextPage. |^uU &O;.
*/ ?Re6oLm<B
publicboolean getHasNextPage(){ 'aq9]D_k
return hasNextPage; n$jOk
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} ]VYv>o`2
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/** b1("(,r/`
* @param hasNextPage }I1A4=d
* The hasNextPage to set. "0,d)L0,"
*/ >z(AQ
publicvoid setHasNextPage(boolean hasNextPage){ )yHJc$OlMx
this.hasNextPage = hasNextPage; #/UlW
} m|7lDfpb
# 1S*}Q<k
/** DE0gd
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* @return nb
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* Returns the hasPrePage. /Ir|& <yB
*/ ,>:
publicboolean getHasPrePage(){ BW`)q/
return hasPrePage; yq?7!X
}
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/** Sxj _gn
* @param hasPrePage 86]})H
* The hasPrePage to set. S%+$
*/ gwf*M3(
publicvoid setHasPrePage(boolean hasPrePage){ 1X5*V!u
this.hasPrePage = hasPrePage; l> Mth+,b
} /~4wM#Yi8
m]Sv>|
/** R5y+bMZ
* @return Returns the totalPage. v(ATbY75
* 3?}W0dZ$d
*/ X5(S+;v"^
publicint getTotalPage(){ r]C`#
return totalPage; 2u(v hJ
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} ZL0':7
I T.'`!T
/** E(0(q#n
* @param totalPage Z[(V0/[]
* The totalPage to set. kpe7\nd=>
*/ m((A
publicvoid setTotalPage(int totalPage){
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this.totalPage = totalPage; !uC`7a
} eX+FtN
rvdhfM!-A
} [i8,rOa7
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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 r N"P
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个PageUtil,负责对Page对象进行构造: l&