Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 tOfg?)h{dc
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 J[f;Xlh
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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"wo
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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 nstUMr6
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分页支持类: E b=}FuV
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java代码: ^ f# FI&
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package com.javaeye.common.util; fk_o@
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import java.util.List; m!<\WN6g
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publicclass PaginationSupport { zbq@pj)Qu
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publicfinalstaticint PAGESIZE = 30; 7b<yVP;{
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privateint pageSize = PAGESIZE; \Gc+WpS(
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privateList items; rF]h$Z8o
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privateint totalCount; x
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privateint[] indexes = newint[0]; :_O%/k1\@
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privateint startIndex = 0; !Y-98<|b
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public PaginationSupport(List items, int V O3x~E
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totalCount){ u,&^&0K,
setPageSize(PAGESIZE); 7D<#(CE{
setTotalCount(totalCount); )kP5u`v
setItems(items); ub|V\M{
setStartIndex(0); ';<0/U
} ELj\[&U
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public PaginationSupport(List items, int }`@728E
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totalCount, int startIndex){ gSh+}r<7
setPageSize(PAGESIZE); 3\B>lKhQ
setTotalCount(totalCount); NUp<e%zB
setItems(items); zRyuq1Zyc,
setStartIndex(startIndex);
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} ^Y'HaneoM
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public PaginationSupport(List items, int [Nk3|u`h
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totalCount, int pageSize, int startIndex){ ndkti5L,
setPageSize(pageSize); BW"5Aj
setTotalCount(totalCount); Rp5#clsy
setItems(items); sJDas,7>
setStartIndex(startIndex); $fzaPD4.
}
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publicList getItems(){ (Tbw3ENz
return items; O)jWZOVp >
} lR(+tj)9uO
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publicvoid setItems(List items){ I= &stsH
this.items = items; C<P%CG&;
} L>3x9
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publicint getPageSize(){ x= 5N3[5
return pageSize; aXoVy&x=
} [DF,^4g
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publicvoid setPageSize(int pageSize){ ~FN9 [aJF+
this.pageSize = pageSize; xjVS
} urjjw.wZ
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publicint getTotalCount(){ lQe%Yh
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return totalCount; {62n7'U{
} pNKhc#-w
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publicvoid setTotalCount(int totalCount){
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if(totalCount > 0){ @]ytla>d
this.totalCount = totalCount; J{k79v
int count = totalCount / <kx&w(=
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pageSize; CW,Wx: Y
if(totalCount % pageSize > 0) U4b0*` o
count++; )3>hhuaa
indexes = newint[count]; Uk6HQQ
for(int i = 0; i < count; i++){ H{=21\a\
indexes = pageSize * Yj6*NZ*
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i; G1o3l~x
} /N&CaH\;^$
}else{ `0Oh_8"
this.totalCount = 0; ybY]e; v*O
} !;KCU^9
} opc/e
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publicint[] getIndexes(){ 5nKj
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return indexes; 0sfr d
} !Ikt '5/
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publicvoid setIndexes(int[] indexes){ ''0fF_P
this.indexes = indexes; a- |*?{o
} CnG+Mc^
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publicint getStartIndex(){ =5(>q5Z*
return startIndex; 1$p2}Bf{n
} RT.D"WvT
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publicvoid setStartIndex(int startIndex){ MP4z-4Y
if(totalCount <= 0) 8n*.).33
this.startIndex = 0; T^Ze3L]
elseif(startIndex >= totalCount) /Sc l#4bW
this.startIndex = indexes g.zEn/SM
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[indexes.length - 1]; &i$ldR
elseif(startIndex < 0) f]\CD<g3|E
this.startIndex = 0; t3&LO~Ye
else{ {;:/-0s
this.startIndex = indexes 4<lRPsvgc
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[startIndex / pageSize]; $D|e>U
} 3v5%y'
} Cc%LztP>
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publicint getNextIndex(){ ck.w
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int nextIndex = getStartIndex() + SBIj<Yy]
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pageSize; 3 G`aHTWk
if(nextIndex >= totalCount) ?MgUY)X
return getStartIndex(); c0;t4(
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else YW60q0:
return nextIndex; q&W[j5E
} y*tZ
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publicint getPreviousIndex(){ 'Pn3%&O$
int previousIndex = getStartIndex() - uFPF!Ern
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pageSize; zY"1drE> G
if(previousIndex < 0) MBhWMCN2
return0; S=e{MI
else |!"`MIw,
return previousIndex; -wSg2'b4E
} X@LRsg
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} :QB<?HaS'
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抽象业务类 QUQu^p
java代码: Ux}(?Z
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/** /5:bvg+
* Created on 2005-7-12 f=mZu1(FZ
*/ t_qNq{
package com.javaeye.common.business; Y<Fz)dQo
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import java.io.Serializable; }9W4"e 2)
import java.util.List; C@L$~iG
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import org.hibernate.Criteria; v4.#;F.\m
import org.hibernate.HibernateException; m|:_]/*qE
import org.hibernate.Session; ML8<4o
import org.hibernate.criterion.DetachedCriteria; yGPS`S
import org.hibernate.criterion.Projections; 6DuEL=C
import .sj^{kGE
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org.springframework.orm.hibernate3.HibernateCallback; L"j
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import OC<5E121>Y
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org.springframework.orm.hibernate3.support.HibernateDaoS 1PP $XJtyD
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upport; YGPy@-,E
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import com.javaeye.common.util.PaginationSupport; ,]cD
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public abstract class AbstractManager extends Tny%7xSx1
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HibernateDaoSupport { 6N;wqn
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privateboolean cacheQueries = false; :C65-[PSdO
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privateString queryCacheRegion; Qe5U<3{JZ
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publicvoid setCacheQueries(boolean !cAyTl(_
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cacheQueries){ =IW?WIXk
this.cacheQueries = cacheQueries; 846$x$G4
} Qe}`~a9P
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publicvoid setQueryCacheRegion(String yLdVd
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queryCacheRegion){ ( 2n>A D_
this.queryCacheRegion = cnFI
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queryCacheRegion; YJ;j x0
} :xh?eN&
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publicvoid save(finalObject entity){ 0\@dYPa&C
getHibernateTemplate().save(entity); ~YRDyQ:%T
} lq> +~zX{
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publicvoid persist(finalObject entity){ (
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getHibernateTemplate().save(entity); ;r>snJ=M
} n ;$5Cq!v=
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publicvoid update(finalObject entity){ `>?ra-
getHibernateTemplate().update(entity); b r^_'1
} Ju3*lk/j-
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publicvoid delete(finalObject entity){ 5K<5kHpvJ{
getHibernateTemplate().delete(entity); DV\`Wv
} @*Wh
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publicObject load(finalClass entity, +S R+x/?z
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finalSerializable id){ @H7Wb}
return getHibernateTemplate().load qd#sY.|1
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(entity, id); <oWB0%
} HVP"A3}KC
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publicObject get(finalClass entity, &p}$J)q
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finalSerializable id){ *+\SyO
return getHibernateTemplate().get "=+7-`
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(entity, id); ;Ww7"-=sw
} (d<4"!
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publicList findAll(finalClass entity){ UQ +?\wi*
return getHibernateTemplate().find("from >j'ZPwj^
B7]C]=${m
" + entity.getName()); *3&fqBg
} +Wx{:
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publicList findByNamedQuery(finalString &3$z4df
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namedQuery){ wAz&"rS
return getHibernateTemplate {O,{c\
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().findByNamedQuery(namedQuery); OzQ -7|m'J
} 8Y_ol#\L
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publicList findByNamedQuery(finalString query, i-'9AYyw
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finalObject parameter){ v$7EvFS
return getHibernateTemplate IR- dU<<9O
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().findByNamedQuery(query, parameter); *0}3t<5
} X5`A GyX
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publicList findByNamedQuery(finalString query, 9&2Vm;F_
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finalObject[] parameters){ ;i"*Ll>Q)
return getHibernateTemplate w,Lvt
}
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().findByNamedQuery(query, parameters); "n: %E
} 581e+iC~<H
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publicList find(finalString query){ E!Zx#XP1
return getHibernateTemplate().find :mS# h@l
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(query); 9XHz-+bQ
} tU^kQR!
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publicList find(finalString query, finalObject h8X g`C\
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parameter){ 8srBHslI
return getHibernateTemplate().find T /mI[*1xI
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(query, parameter); UDc$"a}ds{
} Hi
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public PaginationSupport findPageByCriteria Ic{F*nnM
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(final DetachedCriteria detachedCriteria){ 0}:2Q#
return findPageByCriteria ZKz,|+X0G
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); a2f^x@0k
} p:OPw D+
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public PaginationSupport findPageByCriteria `$YP<CJeq
J j=;
(final DetachedCriteria detachedCriteria, finalint g'l?~s`SB
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startIndex){ G|m1.=DJm
return findPageByCriteria D&ve15wL
#-Z8Z
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(detachedCriteria, PaginationSupport.PAGESIZE, #-"VS-.<
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startIndex); ~aXqU#8
} BT_tOEL#
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{
public PaginationSupport findPageByCriteria m))<!3
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(final DetachedCriteria detachedCriteria, finalint 2T)sXB u
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pageSize, o]LRzI
finalint startIndex){ $ C0TD7=
return(PaginationSupport) 5y}
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getHibernateTemplate().execute(new HibernateCallback(){ W0zbxJKjd
publicObject doInHibernate hKlZi!4J
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(Session session)throws HibernateException { MqKye8h9f
Criteria criteria = _0pO8o-x
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detachedCriteria.getExecutableCriteria(session); %5
int totalCount = Z?^"\u-
8z<r.joxC
((Integer) criteria.setProjection(Projections.rowCount eV6o3u:9
'+*-s7o{
()).uniqueResult()).intValue(); ?G08[aNR
criteria.setProjection M]HgIL@9#
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(null); @-#T5?
List items = d'l$$%zJ
8@M'[jT
criteria.setFirstResult(startIndex).setMaxResults ^ie^VY($
*o' 4,+=am
(pageSize).list(); fMeZ]rb
PaginationSupport ps = NNa1EXZ[
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new PaginationSupport(items, totalCount, pageSize, n+D#k 8{
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startIndex); Gqyue7;0,
return ps; ^ft]b2i
} \,sg)^w@
}, true); y~F<9;$=
} !U BVPR*
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public List findAllByCriteria(final L"rcv:QWZa
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DetachedCriteria detachedCriteria){ S;A)C`X&
return(List) getHibernateTemplate \~X&o% y
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().execute(new HibernateCallback(){ .yVnw^gu
publicObject doInHibernate kd;'}x=5yP
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(Session session)throws HibernateException { B50 [O!
Criteria criteria = 9B)lGLL}q
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detachedCriteria.getExecutableCriteria(session); ;o$;Z4:.D
return criteria.list(); u fw cF*
} BDpF}
}, true); 4YJ=q% G
} vS M_]fn
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public int getCountByCriteria(final JfTfAq]
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DetachedCriteria detachedCriteria){ V_;9TC
Integer count = (Integer) (G8
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getHibernateTemplate().execute(new HibernateCallback(){
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publicObject doInHibernate +p?hGoF=
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(Session session)throws HibernateException { g 2'x#%ET
Criteria criteria = \n@V-b
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detachedCriteria.getExecutableCriteria(session); [A_r1g&_
return ozxYH],
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criteria.setProjection(Projections.rowCount bag&BHw
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()).uniqueResult(); Za!w#j%h
} Wg(bD,
}, true); ZT9IMihV
return count.intValue(); !BRcq~-.
} H'h#wV`(
} 2 `5=0E1k
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bp Ml =_
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用户在web层构造查询条件detachedCriteria,和可选的 ~@YQ,\Y
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 U"B.:C2
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PaginationSupport的实例ps。 L *{QjH
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ps.getItems()得到已分页好的结果集 y.fs,!|%@
ps.getIndexes()得到分页索引的数组 E&9!1!B
ps.getTotalCount()得到总结果数 qwP $~Bj
ps.getStartIndex()当前分页索引 ,|iy1yg(
ps.getNextIndex()下一页索引 Wo2v5-
ps.getPreviousIndex()上一页索引 ~T&%
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 U,38qKE
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 vQy$[D*
[%t3[p<)O
一下代码重构了。 X
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mw Z'=H
我把原本我的做法也提供出来供大家讨论吧:
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首先,为了实现分页查询,我封装了一个Page类: ~z>BfL
java代码: t5n2eOy~T
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/*Created on 2005-4-14*/ 2pjW,I!`
package org.flyware.util.page; H):-!?:
*i%.{ YH
/** =tNzGaWJ
* @author Joa =Iy/cHK
* 7:h<`_HT(X
*/ {:3.27jQ
publicclass Page { s><IykIi
PK_Fx';ke^
/** imply if the page has previous page */ Y=3X9%v9g
privateboolean hasPrePage; e/ WBgiLw
m,=)qex
/** imply if the page has next page */ y%2%^wF
privateboolean hasNextPage; H/pcXj
L)1C'8).
/** the number of every page */ 8znj~7}#
privateint everyPage; Ew>~a8!Fq
~c!Rx'
/** the total page number */ u>81dO]H
privateint totalPage; c1PViko,>
9^(HXH_f
/** the number of current page */ >6XDX=JVI
privateint currentPage; " \`BPN
nZ&T8@m
/** the begin index of the records by the current s c5\( b
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query */ DgC3>
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privateint beginIndex; N?\bBt@
r>E\Cco
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/** The default constructor */ Ft )t`E'%j
public Page(){ bd,Uz%o_
1]_?$)$T
} p(~Y"
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t'dHCp}
/** construct the page by everyPage +{5JDyh0
* @param everyPage R:]/{b4Uq
* */ U)u\1AV5
public Page(int everyPage){ @bc[
eas
this.everyPage = everyPage; Y||yzJdC
} qUifw @
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/** The whole constructor */ fEHh]%GT`
public Page(boolean hasPrePage, boolean hasNextPage, i:V0fBR[>
m5X3{[a:
yT[Lzv#
int everyPage, int totalPage, XC*uz
int currentPage, int beginIndex){ I/^q+l.=`{
this.hasPrePage = hasPrePage; _Wm(/ +G_|
this.hasNextPage = hasNextPage; BO?mQu~
this.everyPage = everyPage; 1y},9ym
this.totalPage = totalPage; t9?R/:B%
this.currentPage = currentPage; -Pqi1pj]
this.beginIndex = beginIndex; b ^uP^](J
} `%FIgE^
%y~`"l$-
/** -@YVe:$%b
* @return TrSN00
* Returns the beginIndex. jz{(q;
*/
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publicint getBeginIndex(){ [ED!J~lg8
return beginIndex; 5u'TmLuKT
} Q
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/** di-O*ug
* @param beginIndex &eThH,w$2
* The beginIndex to set. hg%@ W
*/ y3&Tv
publicvoid setBeginIndex(int beginIndex){ E\{^0vNc
this.beginIndex = beginIndex; mtSNl|O&{
} u~'m7
=?meO0]y
/** GOv92$e
* @return !Z#_X@NFc
* Returns the currentPage. {toyQ)C7
*/ PY^^^01P
publicint getCurrentPage(){ %k/
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return currentPage; B6tcKh9d,
} v\vE^|-\/
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/** 8CHb~m@^$
* @param currentPage jw:4fb
* The currentPage to set. ATYQ6E[{MV
*/
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publicvoid setCurrentPage(int currentPage){ p/\$P=
this.currentPage = currentPage; >>oASo
} n:5O9,umZ
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/** AmT|%j&3
* @return :GwSs'$O
* Returns the everyPage. $I}Hk^X
*/ aBqe+FXp4
publicint getEveryPage(){ !wLH&X$XT
return everyPage; nLFx/5sL
} br34Eh
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/** <FUqD0sQ
* @param everyPage a@5xz)
* The everyPage to set. 877EKvsiC
*/ q
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publicvoid setEveryPage(int everyPage){ j=xtnIq
this.everyPage = everyPage; @\%)'WU
} 3PvZ_!G
X/`#5<x
/** :/yr(V{
* @return [6,]9|~
* Returns the hasNextPage. J'G`=m"-'
*/ .R$+#_
publicboolean getHasNextPage(){ s0XRL1kWr
return hasNextPage; 5C Y@R
} YA^wUx
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/** *f0.= ?
* @param hasNextPage )AnlFO+V
* The hasNextPage to set. zbIwH6
*/ zJG x5JC
publicvoid setHasNextPage(boolean hasNextPage){ .WL\:{G8;
this.hasNextPage = hasNextPage; =BqaGXr
} 5I8FD".i
[x$eF~Kp
/** -CU7u=*b
* @return A]tf>H#1
* Returns the hasPrePage. eZR8<Z%
*/ >?G|Yz*kEJ
publicboolean getHasPrePage(){ F653[[eQ
return hasPrePage; N#pl mPrZ
} PxP?hk
rx}ujjx
/** N1s$3Ul
* @param hasPrePage \4\\575zp'
* The hasPrePage to set. c5B_WqjJ
*/ gq/ePSa
publicvoid setHasPrePage(boolean hasPrePage){ ~q8V<@?
this.hasPrePage = hasPrePage; Zv1Bju*y
} 7'{Yz
r'9=kx
/** Y6;0khp
* @return Returns the totalPage. wQdW
lon
* !ulLGmUn
*/ 5|6z1{g8
publicint getTotalPage(){ ."!8B9s
return totalPage; VJ6>3
} 8H3!; ]
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/** oxCs*
* @param totalPage ~7ATt8T
* The totalPage to set. VHgF#6'
*/ K)h"G#NZM
publicvoid setTotalPage(int totalPage){ I7G\X#,iz
this.totalPage = totalPage; j;AzkReb
} <D;H}ef
[KimY
} PO%yWns30o
g<hv7?"[
t'=~"?T/o
CQ8o9A/
U&w5&W{F}
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 j quSR=
w}bEufU+2
个PageUtil,负责对Page对象进行构造: ^+-L;XkeY
java代码: ?9('o\N:
QN}3S0
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/*Created on 2005-4-14*/ =qS^Wz.
package org.flyware.util.page; DETajf/<F
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import org.apache.commons.logging.Log;
];b!*Z
import org.apache.commons.logging.LogFactory; :i,c<k
,8J*S
/** LKf5r,C
* @author Joa !aW*dD61
* %8}ksl07
*/ 7u`}t83a
publicclass PageUtil { #hE3~+i
o$blPTN
privatestaticfinal Log logger = LogFactory.getLog V&,<,iNN
5cNzG4z
(PageUtil.class); B1d%#
Y8`))MeD
/** ZTBFV/{
* Use the origin page to create a new page E!}-qbH^
* @param page 4na4Jsq{
* @param totalRecords #o"HD6e
* @return TJw.e/
*/ Pu%>j'A
publicstatic Page createPage(Page page, int uDE91.pUkr
Sj{rvW
totalRecords){ Y^jnlS)h
return createPage(page.getEveryPage(), S^Wqa:;
SG|i/K|7
page.getCurrentPage(), totalRecords); yz2oS|0 '
} R 6yvpH
602eLV)
/**
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<
* the basic page utils not including exception Acq>M^E3
^0ZKHR(}e
handler j=jrzG+`
* @param everyPage 6dS1\Y
* @param currentPage ZnhuIAAG
* @param totalRecords KEVy%AP=*h
* @return page rd 35)
*/ F{H0
%
publicstatic Page createPage(int everyPage, int $Z7|t
6m{$rBR
currentPage, int totalRecords){ ux79"5qb
everyPage = getEveryPage(everyPage); L%s4snE
currentPage = getCurrentPage(currentPage); hA,rSq
int beginIndex = getBeginIndex(everyPage, XFf+efh
iJaNP%N
currentPage); %}]4Nsd e
int totalPage = getTotalPage(everyPage, i8[Y{a*
-Ib+ /'
totalRecords); +SA<0l
boolean hasNextPage = hasNextPage(currentPage, C"` 'Re5)
NK#"qK""k
totalPage); %]sEt{
boolean hasPrePage = hasPrePage(currentPage); ]BQWA
hPXVPLm7I
returnnew Page(hasPrePage, hasNextPage, a9EI7pnq
everyPage, totalPage, *~<]|H5~
currentPage, $:gSc&mx
C(|T/rQ-
beginIndex); K9N0kBJ0<
} !q6V@&
;pNbKf:
privatestaticint getEveryPage(int everyPage){ *sIG&
return everyPage == 0 ? 10 : everyPage; l[\,*C
} +uiH0iGS
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privatestaticint getCurrentPage(int currentPage){ PN^1
return currentPage == 0 ? 1 : currentPage; h, 6S$,UI
} .'2gJ"?,
dR, NC-*
privatestaticint getBeginIndex(int everyPage, int ZNC?Ntw
/2\=sTd
currentPage){ nIqY}??
return(currentPage - 1) * everyPage; /'=^^%&:B