Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 D/[(}o(
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 scZdDbL6+
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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 CT(VV6I\
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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 n]c6nX:'
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分页支持类: d~n|F|`:
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java代码: /qM:;:N%j
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package com.javaeye.common.util; Qa-]IKOs
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import java.util.List; oRH]67(Z
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publicclass PaginationSupport { n3Uw6gLD
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publicfinalstaticint PAGESIZE = 30; &ig6\&1
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privateint pageSize = PAGESIZE; 5~)m6]-6
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privateList items; /BeA-\B
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privateint totalCount; B.
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privateint[] indexes = newint[0]; nM]Sb|1:
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privateint startIndex = 0; g>].m8DZ'
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public PaginationSupport(List items, int pgNyLgN
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totalCount){ YKCd:^u
setPageSize(PAGESIZE); J4Yu|E<&
setTotalCount(totalCount); NHI(}Ea|]
setItems(items); NmbA~i
setStartIndex(0); r5#8Vzr
} +q*Cw>t /
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public PaginationSupport(List items, int W_JFe(=3,
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totalCount, int startIndex){ -l)u`f^n|
setPageSize(PAGESIZE); Eu;f~ V
setTotalCount(totalCount); }\
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setItems(items); ]!%
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setStartIndex(startIndex); V@%:y tDf
} Nj~3FL
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public PaginationSupport(List items, int jEaU;
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totalCount, int pageSize, int startIndex){ a8Va3Y
setPageSize(pageSize); "~:AsZ"7
setTotalCount(totalCount); j*XhBWE?
setItems(items); +c&oF,=}!P
setStartIndex(startIndex); Dej_(Dz_S
} E$8D^Zt
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publicList getItems(){
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return items; q`u ^ sc
} } ={TVs^
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publicvoid setItems(List items){ sfo+B$4|
this.items = items; cM|!jnKm
} agI"Kh]j?
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publicint getPageSize(){ C]- !uLy
return pageSize; ].(l^W
} 1Uy'TEk
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publicvoid setPageSize(int pageSize){ He1hgJ)N
this.pageSize = pageSize; #uc9eh}CWO
} KFuPgp
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publicint getTotalCount(){ LA9'HC(5
return totalCount; /%F}vW(!
} g]mR;T3
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publicvoid setTotalCount(int totalCount){ :svKE.7{
if(totalCount > 0){ B3';Tcs
this.totalCount = totalCount; zKllwIfi
int count = totalCount / \GP0FdpV
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pageSize; Uv|?@zy#
if(totalCount % pageSize > 0) mzGMYi*
count++; l'Kx#y$
indexes = newint[count]; J=`2{
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for(int i = 0; i < count; i++){ nQm
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indexes = pageSize * />0
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} n~mP7X%wE7
}else{ k;~*8i=%,\
this.totalCount = 0; <t"KNKI
} VEGp!~D
} b+tm[@|,v
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publicint[] getIndexes(){ \jCN ]A<
return indexes; k )=Gyv<
} i[O{M`Z%
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publicvoid setIndexes(int[] indexes){ !M(3[(Ni
this.indexes = indexes; GS@Zc2JPF
} t^|GcU]
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publicint getStartIndex(){ c*DBa]u2
return startIndex; #J`MR05
} Nq>"vEq)
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publicvoid setStartIndex(int startIndex){ "*HVL
if(totalCount <= 0) ZQI;b0C
this.startIndex = 0; l\"wdS}
elseif(startIndex >= totalCount) K4vOy_wT
this.startIndex = indexes iw =~j
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[indexes.length - 1]; v"8i2+j
elseif(startIndex < 0) =EQaZ8k
this.startIndex = 0; +8Q5[lh2]j
else{ =DsFR9IB
this.startIndex = indexes R^Y>v5jAe
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[startIndex / pageSize]; kj]m@mS[
} NhRKP"<CO
} ,UATT]>
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publicint getNextIndex(){ d8N4@3 CkL
int nextIndex = getStartIndex() + :P?zy| aBi
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pageSize; ?!;i/h*{
if(nextIndex >= totalCount) #%{x*y:Ms
return getStartIndex(); xv9G%
else N D1'XCN
return nextIndex; H|I.h{:
} (yv)zg9
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publicint getPreviousIndex(){ aBT8mK -.
int previousIndex = getStartIndex() -
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pageSize; ~zcB@; :
if(previousIndex < 0) Ox^VU2K;&.
return0; Gi Max
else w|(
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return previousIndex; iXD=_^^o .
} :IRQouTf:,
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} mt]50}eK
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抽象业务类 K?gO]T{6
java代码: ?a{>QyL
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/** }ZkGH}K_}
* Created on 2005-7-12 a~A"uLBR
*/ !WNO!S0/j
package com.javaeye.common.business; <~P([5
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import java.io.Serializable; &O|qx~(
import java.util.List; ~NBlJULS
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import org.hibernate.Criteria; )g[7XB/w
import org.hibernate.HibernateException; 0wZAsG"Bg
import org.hibernate.Session; U~_G *0
import org.hibernate.criterion.DetachedCriteria; YnW,6U['{g
import org.hibernate.criterion.Projections; )!g@MHHL
import ^k4 n
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org.springframework.orm.hibernate3.HibernateCallback; XE?,)8
import 4S*7*ak{
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org.springframework.orm.hibernate3.support.HibernateDaoS != u
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upport; Rkh
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import com.javaeye.common.util.PaginationSupport; _v +At;Y
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public abstract class AbstractManager extends rj-Q+rgup
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HibernateDaoSupport { 6d%)MEM
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privateboolean cacheQueries = false; @2R+?2 j
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privateString queryCacheRegion; .MI
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publicvoid setCacheQueries(boolean nWsR;~pK
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cacheQueries){ P(Z\y^S
this.cacheQueries = cacheQueries; Z$2Vd`XP
} #PZBh
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publicvoid setQueryCacheRegion(String
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queryCacheRegion){ Wm>AR? b
this.queryCacheRegion = 6I~{~YvB"
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queryCacheRegion; `]m/za%7
} HQtUNtZ
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publicvoid save(finalObject entity){ Cswa5l`af
getHibernateTemplate().save(entity); >TddKR@C
} DY!mq91
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publicvoid persist(finalObject entity){ n9r3CLb[
getHibernateTemplate().save(entity); ?*A"#0
} >? ({
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publicvoid update(finalObject entity){ X]AbBzy
getHibernateTemplate().update(entity); TM1J1GU
} }Q%fY(bp
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publicvoid delete(finalObject entity){ 7COJ.rA
getHibernateTemplate().delete(entity); dI|`"jl#
} m=p<.%a
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publicObject load(finalClass entity, 7{:g|dX
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finalSerializable id){ V;SXa|,
return getHibernateTemplate().load qvhol
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(entity, id); [Q*aJLG
} %Lwd1'C%
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publicObject get(finalClass entity, _Q3Ad>,U
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finalSerializable id){ %xWscA%^u
return getHibernateTemplate().get hSyA;*)U
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(entity, id); M=aWL!nJ
} 1GL@t?S
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publicList findAll(finalClass entity){ ]kd )j
return getHibernateTemplate().find("from Fl^}tC
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" + entity.getName()); %7oB[2
} dQ4K^u
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publicList findByNamedQuery(finalString 4SqZV
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namedQuery){ `y!6(xI
return getHibernateTemplate :
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().findByNamedQuery(namedQuery); p8q9:Tz
} ?"no~(EB
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publicList findByNamedQuery(finalString query, >cPB:kD'
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finalObject parameter){ |ei?s1)
return getHibernateTemplate U&mJ_f#M
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().findByNamedQuery(query, parameter); _r}oYs%1
} Q\~4J1
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publicList findByNamedQuery(finalString query, AVR9G^ce_
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finalObject[] parameters){ F`ifHO
return getHibernateTemplate !j)H!|R
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().findByNamedQuery(query, parameters); C'hI{4@P
} $+<X 1
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publicList find(finalString query){ 9_rNJLj8y
return getHibernateTemplate().find +OF(CcA^
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(query); j}chU'if
} 2oAPJUPOJ
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publicList find(finalString query, finalObject 1WPDMLuN
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parameter){ Oah}7!a)
return getHibernateTemplate().find 8 F'i5i
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(query, parameter); !GMb~
} r +;C}[E
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public PaginationSupport findPageByCriteria J?-"]s`J
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(final DetachedCriteria detachedCriteria){ kF~}htv.=
return findPageByCriteria Xt/T0.I
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); Zb7KHKO{
} TD,W *(b
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public PaginationSupport findPageByCriteria q+t*3;X.
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(final DetachedCriteria detachedCriteria, finalint -)
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startIndex){ [Y*p
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return findPageByCriteria El0|.dW
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(detachedCriteria, PaginationSupport.PAGESIZE, &^1DNpUZ
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startIndex); VbK| VON[
} npz*4\4
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public PaginationSupport findPageByCriteria -U"(CGb5
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(final DetachedCriteria detachedCriteria, finalint 'HkV_d[li
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pageSize, ]gkI:scPA
finalint startIndex){ _i:yI-jA
return(PaginationSupport) z)q9O_g9
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getHibernateTemplate().execute(new HibernateCallback(){ //>f#8Ho
publicObject doInHibernate
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(Session session)throws HibernateException { (<(8(}x
Criteria criteria = 5>"$95D
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detachedCriteria.getExecutableCriteria(session); LnxJFc:1K
int totalCount = [$]vi`c2
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((Integer) criteria.setProjection(Projections.rowCount _%;$y5]v
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()).uniqueResult()).intValue(); Bh"o{-$p8`
criteria.setProjection
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(null); 9EK5#_L[=
List items = H{E223
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criteria.setFirstResult(startIndex).setMaxResults I/<aY*R4
; GRSe
(pageSize).list(); h:<pEL
PaginationSupport ps = SQ]&nDd
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new PaginationSupport(items, totalCount, pageSize, G 2+A`\]
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startIndex); *ELbz}Q
return ps; /^G1wz2
} p./zW
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}, true); t`o-HWfS.
} <6)Ogv",
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public List findAllByCriteria(final _)yn6M'Dt
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DetachedCriteria detachedCriteria){ y-)|u:~h
return(List) getHibernateTemplate E;*#fD~@
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().execute(new HibernateCallback(){ Cz-eiPlq
publicObject doInHibernate Q35$GFj"jD
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(Session session)throws HibernateException { %(MaH
Criteria criteria = ) kfA5xi[
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detachedCriteria.getExecutableCriteria(session); *8M0h9S$
return criteria.list(); ARGtWW~:
} SpU+y|\[0
}, true); CH[U.LJQ-O
} PTWP7A[
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public int getCountByCriteria(final $l@nk@
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DetachedCriteria detachedCriteria){ 5I`j'j
Integer count = (Integer) SU~t7Ta!G
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getHibernateTemplate().execute(new HibernateCallback(){ 47 xyS%X
publicObject doInHibernate 6c,]N@,Zw
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(Session session)throws HibernateException { T2<?4^xN
Criteria criteria = SR)G!9z_/
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detachedCriteria.getExecutableCriteria(session); <E/4/
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return HX%lL}E
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criteria.setProjection(Projections.rowCount M3P\1
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()).uniqueResult(); qM=
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} 44C"Pl
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}, true); (8T36pt~
return count.intValue(); tIn
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} FcVQ_6
} N^</:R
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用户在web层构造查询条件detachedCriteria,和可选的 yvR3|
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 )45~YDS;t
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PaginationSupport的实例ps。 &!i'Q;q
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ps.getItems()得到已分页好的结果集 :kU#5Aj gK
ps.getIndexes()得到分页索引的数组 ~5`p/.L)ZD
ps.getTotalCount()得到总结果数 <14,xYpE
ps.getStartIndex()当前分页索引 t&|M@Ouet
ps.getNextIndex()下一页索引 N;Hoi8W
ps.getPreviousIndex()上一页索引 g
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 &<nj~BL
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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 5>r2&72=
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一下代码重构了。 s!73To}>
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我把原本我的做法也提供出来供大家讨论吧: Rtywi}VV2
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首先,为了实现分页查询,我封装了一个Page类: Q*jNJ^IW
java代码: eewlK]
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/*Created on 2005-4-14*/ ZuLW%z.
package org.flyware.util.page; Pk?M~{S
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/** xaN[ru@
* @author Joa aHR+4m~)
* 7&`Yl[G
*/ "J(T?|t
publicclass Page { tl6x@%\
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/** imply if the page has previous page */ }'`iJb\
privateboolean hasPrePage; =w;~1i%.k
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/** imply if the page has next page */ XpH d"(*
privateboolean hasNextPage; 4e20\q_{
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/** the number of every page */ )+ (GE
privateint everyPage; jvQpfd
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/** the total page number */ P.
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privateint totalPage; Oh=E!
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/** the number of current page */ ?Gnx!3Q
privateint currentPage; Ud:;kI%Vj
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/** the begin index of the records by the current U[O7}Nsb"
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query */ (z.4er}o
privateint beginIndex; eWGaGRem
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/** The default constructor */ *{!E`),FX
public Page(){ e3.q8r
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} #z#`EBXV$6
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/** construct the page by everyPage Gd Vrl[
* @param everyPage YH,u*.I^/
* */ !g[UFw
public Page(int everyPage){ LjySO2
this.everyPage = everyPage; kInU,/R*
} kXN8hU}iq
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/** The whole constructor */ &BxZ}JH=k
public Page(boolean hasPrePage, boolean hasNextPage, je;|zfe]
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int everyPage, int totalPage, /0YO`])"
int currentPage, int beginIndex){ HSj=g}r
this.hasPrePage = hasPrePage; DQ.; 2W
this.hasNextPage = hasNextPage; zP8rW5/
this.everyPage = everyPage; quL+UFuM
this.totalPage = totalPage; 7r{159&=
this.currentPage = currentPage; |wM<n
this.beginIndex = beginIndex; 6<o2 0(?
} M@ =VIrX,m
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/** Hrg -5_
* @return 19;Pjo8
* Returns the beginIndex. ==npFjB
*/ BIxjY!!"
publicint getBeginIndex(){ m\f}?t
return beginIndex; Ksf f]##H
} rqTsKrLe
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/** @MxB
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* @param beginIndex &PUn,9 Rm
* The beginIndex to set. M*Ri1
*/ wBz5_ OFVw
publicvoid setBeginIndex(int beginIndex){ m't8\fo^w
this.beginIndex = beginIndex; rm%MQmF
} "R0(!3
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/** b[^|.>b
* @return glomwny
* Returns the currentPage. 2CRgOFR
*/ 7OD2/{]5
publicint getCurrentPage(){ &?*H`5#?G
return currentPage; i#I7ncX
} hQ}y(2A.XI
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/** Qe;R3D=T;
* @param currentPage .R_-$/ZP
* The currentPage to set. cH`ziZ<&m1
*/ UIo jXR<
publicvoid setCurrentPage(int currentPage){ )Ec /5=A
this.currentPage = currentPage; MI,kKi
} $bF3v=u`
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/** !h70 <Q^
* @return X< 4f7;]O
* Returns the everyPage. tY- `$U@
*/ aucG|}B
publicint getEveryPage(){ %
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return everyPage; [orS-H7^
} Xcb'qU!2-^
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/** 2h#_n'DV
* @param everyPage 5GwzG<.\^_
* The everyPage to set. bE1@RL
*/ 5OC{_-
publicvoid setEveryPage(int everyPage){ !Q=xIS
this.everyPage = everyPage; ^oDSU7j5,
} UF;iw
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/** k3UKGP1
* @return zhVkn]z~*
* Returns the hasNextPage. _)MbvF
*/ vt(cC))
publicboolean getHasNextPage(){ EttQ<z_T
return hasNextPage; ;mwU>l,4
} -J^t#R^$`
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/** LfX[(FP
* @param hasNextPage l{t!
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* The hasNextPage to set. QBLha']'%
*/ O"emse}Z
publicvoid setHasNextPage(boolean hasNextPage){ 'a=' (,%
this.hasNextPage = hasNextPage; C%Fc%}[
} PDhoCAh
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/** Pk^W+M_)~
* @return +&.wc;mi
* Returns the hasPrePage. RP%7M8V){B
*/ THmmf_w@
publicboolean getHasPrePage(){ b$N&sZ
return hasPrePage; c;7`]}fGu
} 9Bi{X_.9
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/** 1{?5/F \ +
* @param hasPrePage +J7xAyv_Oz
* The hasPrePage to set. }o7"2hht
*/ d[y(u<Vl
publicvoid setHasPrePage(boolean hasPrePage){ nZ/pi$7
this.hasPrePage = hasPrePage; Yl"l|2
:
} cc:,,T/i
wg=-&-
/** b|nh4g
* @return Returns the totalPage. Mcqym8,q|3
* :NXM.@jJ="
*/ ,_I#+XiXY
publicint getTotalPage(){ 1Ts$kdO
return totalPage; \kG;T=H
} T*rx5*:o
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/** 4+q3
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* @param totalPage ,7ZV;f81
* The totalPage to set. 6HRr4NDcj
*/ ,L$,d
publicvoid setTotalPage(int totalPage){ Y(6 p&I
this.totalPage = totalPage;
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} 8'o6:
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} O^sOv!!RH/
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;}4^WzmK^(
上面的这个Page类对象只是一个完整的Page描述,接下来我写了一 UBM:.*wN
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个PageUtil,负责对Page对象进行构造: [)t1"
java代码: 4x2,X`pe3
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/*Created on 2005-4-14*/ L%
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package org.flyware.util.page; # GOL%2X
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import org.apache.commons.logging.Log; ^(~%'f
import org.apache.commons.logging.LogFactory; 8 EUc
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/** cCO2w2A[*
* @author Joa :Hq#co
* Z Z9D6+R
*/ `}S;_g!
publicclass PageUtil { J1"16Uu
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privatestaticfinal Log logger = LogFactory.getLog Zk>#T:{h
~ ^*;#[<
(PageUtil.class); ?XB[awTD~
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/** >$G'=N:=X&
* Use the origin page to create a new page f]48>LRE8
* @param page "g:1br?X,9
* @param totalRecords !pxOhO.V
* @return ph>0?Z =bn
*/ #H.DnW
publicstatic Page createPage(Page page, int )<[)7`
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totalRecords){ D|D)782
return createPage(page.getEveryPage(), l$ufW|
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page.getCurrentPage(), totalRecords); x*!%o(G
} /Suh&qw>
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/** xl ,(=L]
* the basic page utils not including exception _*fOn@Vwo
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handler A.cNOous|
* @param everyPage $[V-M\q
* @param currentPage <