Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 {N)\It
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 zIF &ZYP
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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 bQXxb(^
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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 t
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分页支持类: #Yw^n?~~
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java代码: ,EZ&n[%Ko
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package com.javaeye.common.util; ~lDLdUs
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import java.util.List; h4?+/jk7
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publicclass PaginationSupport { 15yIPv+5
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publicfinalstaticint PAGESIZE = 30; Xid>8
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privateint pageSize = PAGESIZE; `}zv17wp
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privateList items; <ya'L&
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privateint totalCount; v[Q)cqj/
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privateint[] indexes = newint[0]; E*(Q'p9C
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privateint startIndex = 0; K"}Dbr
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public PaginationSupport(List items, int _
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totalCount){ N->;q^
setPageSize(PAGESIZE); 2CmeO&(Qf*
setTotalCount(totalCount); %i.|bIhmm
setItems(items); WZm^:,
setStartIndex(0);
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} uFok'3!g7%
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public PaginationSupport(List items, int DVB:8"Bu
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totalCount, int startIndex){ @%#(Hse
setPageSize(PAGESIZE); kk~{2
setTotalCount(totalCount); Lvp/} /H/
setItems(items); ise@,[!
setStartIndex(startIndex); PU'v o4
} OW-+23)sj
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public PaginationSupport(List items, int vi5~ Rd`
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totalCount, int pageSize, int startIndex){ wSAm[.1i
setPageSize(pageSize); Xrz0ch
setTotalCount(totalCount); R=e`QMq
setItems(items); Q'8v!/"}p{
setStartIndex(startIndex); l w%fY{
} kkJg/:g
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publicList getItems(){ r p@=
return items; IcQ?^9%{
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publicvoid setItems(List items){ D>|:f-Z6Z
this.items = items; AGv;8'`
} .s!:p pwl
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publicint getPageSize(){ <!+o8z]
return pageSize; ,88Y1|:X
} -"cN9RF
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publicvoid setPageSize(int pageSize){ K[ \z'9Q
this.pageSize = pageSize; hV,3xrm?P
} *jJ62-o
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publicint getTotalCount(){ kEXcEF_9P
return totalCount; p0tv@8C>
} Z
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publicvoid setTotalCount(int totalCount){ mi-\PD>X
if(totalCount > 0){ I}q-J~s
this.totalCount = totalCount; #E ~FF@a
int count = totalCount / =.o-R=:d
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pageSize; w1}[lq@
if(totalCount % pageSize > 0) )R|7> 97
count++; a>kDG <.A
indexes = newint[count]; i]YQq! B
for(int i = 0; i < count; i++){ n -=\n6"P
indexes = pageSize * zJsoenU
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}
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} ,S5#Kka~a
}else{ 2tbqmWw/s
this.totalCount = 0; aQG#bh [
}
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} T9$U./69-L
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publicint[] getIndexes(){ {c1qC zM4
return indexes; |`okIqp
} 4ku /3/6
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publicvoid setIndexes(int[] indexes){ =aekY;/
this.indexes = indexes; [_0g^(`
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publicint getStartIndex(){ D#$gdjZ
return startIndex; 4w?7AI]Ej
} q1gf9`0
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publicvoid setStartIndex(int startIndex){ 3(&.[o
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if(totalCount <= 0) K]u|V0c
this.startIndex = 0; Z-<u?f8{*
elseif(startIndex >= totalCount) joA+
this.startIndex = indexes }ot _k-
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[indexes.length - 1]; Om^/tp\
elseif(startIndex < 0) O7\s1
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this.startIndex = 0; BNy"YK$
else{ 4W?<hv+k7*
this.startIndex = indexes O<3,n;56Z
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[startIndex / pageSize]; 5;{Bdvcv
} 47 RY pd
} q>[% C5
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publicint getNextIndex(){ {eXYl[7n
int nextIndex = getStartIndex() + J
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pageSize; n1t(ns|
if(nextIndex >= totalCount) Q*8-d9C
return getStartIndex(); s]N-n?'G"
else j[fQs,efK
return nextIndex; LnDj
} -b$OHFL
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publicint getPreviousIndex(){ X\x9CA
int previousIndex = getStartIndex() - /kz&9FM
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pageSize; [z~Nw#
if(previousIndex < 0) K[[k,W]qb
return0; OeYLL4H
else @NIypi$T
return previousIndex; eqR#`
} uI2'jEjO
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抽象业务类 /;4MexgB%
java代码: `$H
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/** HWhKX:`l
* Created on 2005-7-12 [S:)UvB
*/ {*U:Wm<
package com.javaeye.common.business; cnthtv+(~
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import java.io.Serializable; As|/
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import java.util.List; sQZ8<DpB
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import org.hibernate.Criteria; @>5<m'}2
import org.hibernate.HibernateException; }^[@m#
import org.hibernate.Session; 1VFqT'
import org.hibernate.criterion.DetachedCriteria; pCc7T-"og
import org.hibernate.criterion.Projections; %B*dj9n^q
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org.springframework.orm.hibernate3.HibernateCallback; a1SOC=.M;
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org.springframework.orm.hibernate3.support.HibernateDaoS rbPs~C-[
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upport; }yw;L(3
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import com.javaeye.common.util.PaginationSupport; # &83;uys
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public abstract class AbstractManager extends F5+_p@!i
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HibernateDaoSupport { uR@`T18
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privateboolean cacheQueries = false; t5X
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privateString queryCacheRegion; f9UaAdJ(
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publicvoid setCacheQueries(boolean lM^!^6=v0l
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cacheQueries){ /\cu!yiX
this.cacheQueries = cacheQueries; oh~
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} [IFRwQ^%_O
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publicvoid setQueryCacheRegion(String HFuaoS+b*
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queryCacheRegion){ WG
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this.queryCacheRegion = rs Uw(K^
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queryCacheRegion; 7/_ VE
} \Z20fh2
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publicvoid save(finalObject entity){ 4>VZk^%b#
getHibernateTemplate().save(entity); yVHlT
} n/oipiYx
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publicvoid persist(finalObject entity){ 07Q[L'}y@
getHibernateTemplate().save(entity); FJ~_0E#L
} :$i:8lz
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publicvoid update(finalObject entity){ s9kLB.
getHibernateTemplate().update(entity); U?fN3
} yj'' \
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publicvoid delete(finalObject entity){ \h7J/es^p!
getHibernateTemplate().delete(entity); nX\]i~
} @gSFvb bc
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publicObject load(finalClass entity, Pgw%SMEp
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finalSerializable id){ *C@[5#CA2z
return getHibernateTemplate().load iW1ih QX
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(entity, id); e=o{Zo?H=
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publicObject get(finalClass entity, r@[VY g~
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finalSerializable id){ Eqmv`Z
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return getHibernateTemplate().get 'SU9NQS
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(entity, id); j(6$7+2qN
} _SIs19"lR
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publicList findAll(finalClass entity){ 0uIV6LI
return getHibernateTemplate().find("from R g0
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" + entity.getName()); J'ZFIT_>
} FW)^O%2s
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publicList findByNamedQuery(finalString '!^E92
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namedQuery){ Uty(sDtu
return getHibernateTemplate q"+ q
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().findByNamedQuery(namedQuery); Md>f
} `}9 1S
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publicList findByNamedQuery(finalString query, B2G5hbaA
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finalObject parameter){ Naf`hE9
return getHibernateTemplate "T{~,'T
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().findByNamedQuery(query, parameter); I,<>%Z|'
} \'??
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publicList findByNamedQuery(finalString query, qBBYckS.
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finalObject[] parameters){ n-y^7'v
return getHibernateTemplate VX!Y`y^a
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().findByNamedQuery(query, parameters); ci,o8 [Y
} u3M`'YCb
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publicList find(finalString query){ zY+t ,2z
return getHibernateTemplate().find ) _9e@~,
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(query); /=muj9|+s
} HTDyuqs
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publicList find(finalString query, finalObject YMj7
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parameter){ kj{rk^x
return getHibernateTemplate().find T Oco({/_/
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(query, parameter); Qh|-a@
} u+z .J4w
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public PaginationSupport findPageByCriteria Nxbd~^j
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(final DetachedCriteria detachedCriteria){ ?GUz?'d
return findPageByCriteria Ez/\bE
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); kMl @v`
} 6+Wr6'kuH
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public PaginationSupport findPageByCriteria 6bbZ<E5At
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(final DetachedCriteria detachedCriteria, finalint {DEzuU
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startIndex){ *Z]5!$UpC
return findPageByCriteria [GR]!\!%~
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(detachedCriteria, PaginationSupport.PAGESIZE, <\1}@?NGC
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startIndex); 6(N.T+;]
} Gd30Be2gd
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public PaginationSupport findPageByCriteria C.yY8?|
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(final DetachedCriteria detachedCriteria, finalint +CnyK(V
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pageSize, 1z})mfsh
finalint startIndex){ -+3be(u
return(PaginationSupport) O+G~Qp0b>
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getHibernateTemplate().execute(new HibernateCallback(){ 6keP':bt
publicObject doInHibernate ^%n124
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(Session session)throws HibernateException { !lQ#sL`
Criteria criteria = F5N>Uqr*oN
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detachedCriteria.getExecutableCriteria(session); 2Vz'n@g=
int totalCount = Sni&?tcY
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((Integer) criteria.setProjection(Projections.rowCount ,}9f(`
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()).uniqueResult()).intValue(); do:QH.q8)
criteria.setProjection tA`mD >[
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(null); >DDQ'W !
List items = O"
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criteria.setFirstResult(startIndex).setMaxResults m>]>$=%
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(pageSize).list(); Dk)@>l:gI,
PaginationSupport ps = `fQM
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new PaginationSupport(items, totalCount, pageSize,
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startIndex); R#Y50hzT
return ps; O24Jj\"
} b7,
}, true); tO?21?AD D
} 7*zB*"B'1t
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public List findAllByCriteria(final f!5F]qP>-
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DetachedCriteria detachedCriteria){ -L@]I$Yo
return(List) getHibernateTemplate x S
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().execute(new HibernateCallback(){ \Os:6U=X-
publicObject doInHibernate s{yJ:WncI
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(Session session)throws HibernateException { 'n~fR]h}
Criteria criteria = sS
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detachedCriteria.getExecutableCriteria(session); fph-v -cl
return criteria.list(); n`P`yb\f$
} T1l&B
}, true); W;^N8ap%
}
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public int getCountByCriteria(final g93I+
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DetachedCriteria detachedCriteria){ QZ?d2PC=>?
Integer count = (Integer) S*4f%!
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getHibernateTemplate().execute(new HibernateCallback(){ Af`z/:0<
publicObject doInHibernate W&<g} N+
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(Session session)throws HibernateException { {5SfE$r
Criteria criteria = ft{W/ * +_
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detachedCriteria.getExecutableCriteria(session); j2M4H@
return mRCHrw?WG
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criteria.setProjection(Projections.rowCount zCBplb
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()).uniqueResult(); YZ0en1ly
} Z*9L'd"D|
}, true); f7Yz>To
return count.intValue(); 8fnR1mWG
} e{5,'(1]
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用户在web层构造查询条件detachedCriteria,和可选的 k,T_e6(
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 M^uU4My
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PaginationSupport的实例ps。 zyDZ$Dhka
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ps.getItems()得到已分页好的结果集 G[#.mD{k
ps.getIndexes()得到分页索引的数组 Khj=llo,
ps.getTotalCount()得到总结果数 h77IWo6%
ps.getStartIndex()当前分页索引 9[kX/#~W*
ps.getNextIndex()下一页索引 8\DME
ps.getPreviousIndex()上一页索引 w$b~x4y%
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 p zg&/m&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 >&1um5K
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