Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 UH0l8ixc
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 wz3X;1l`c
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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 G~C-tAB
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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 HD#>K 7
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分页支持类: *=B<S/0
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java代码: 8F<|.V;
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package com.javaeye.common.util; /"="y'Wx
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import java.util.List; 075IW"p'
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publicclass PaginationSupport { H(K!{k
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publicfinalstaticint PAGESIZE = 30; |qguLab(
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privateint pageSize = PAGESIZE; g&$5!ifgi
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privateList items; q p}2
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privateint totalCount; c}$>UhLe
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privateint[] indexes = newint[0]; %JPr 7 }
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privateint startIndex = 0; kD+#| f
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public PaginationSupport(List items, int 2 {WZ?H93a
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totalCount){ y|BHSc3
setPageSize(PAGESIZE); m4W (h6
setTotalCount(totalCount); q]f7D\ M
setItems(items); i@6g9\x+
setStartIndex(0); jTqJ(M}L
} c{to9Lk.#
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public PaginationSupport(List items, int < ~CY?
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totalCount, int startIndex){ *;Q#UH
setPageSize(PAGESIZE); }8l+Jd3"
setTotalCount(totalCount); c"knzB vy
setItems(items);
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setStartIndex(startIndex); _}j>
} ]3|h6KWq
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public PaginationSupport(List items, int lMW6D0^
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totalCount, int pageSize, int startIndex){ 8hy1yt6t4~
setPageSize(pageSize); HQ=pf >
setTotalCount(totalCount); ZTqt 4H
setItems(items); $l.8
setStartIndex(startIndex); ;W+1 H !
} :#sBNy
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publicList getItems(){ tjV63`LD
return items; v@2?X4n
}
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publicvoid setItems(List items){ ?5Z-w
this.items = items; HW_2!t_R
} _{^F8
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publicint getPageSize(){ 8Dxg6>
return pageSize; ( Ygy%O%
} 2>x[_
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publicvoid setPageSize(int pageSize){ *a_QuEw_k
this.pageSize = pageSize; .'+JA:3R
} b)XGr?
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publicint getTotalCount(){ c\P}ZQ
return totalCount; *2pE39
} 4;Hm%20g
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publicvoid setTotalCount(int totalCount){ 4K;0.W;~|
if(totalCount > 0){ N/0Q`cQ-
this.totalCount = totalCount; KVoi>?a
int count = totalCount / %^I 7=
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pageSize; P:'y}a-
if(totalCount % pageSize > 0) <;b
count++; 7~MWp4.
indexes = newint[count]; ByWad@-6i
for(int i = 0; i < count; i++){ tx3p,
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indexes = pageSize * ;F, 6]LH!
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} A}pe>ja
}else{ q_;# EV
this.totalCount = 0; 8BS$6Pa
} :/Y4I)'
} =5pwNi_S
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publicint[] getIndexes(){ E9 #o0Di
return indexes; 1U~'8=-
} hoPh#? G
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publicvoid setIndexes(int[] indexes){ 0B`rTLwB
this.indexes = indexes; _#P5j#
} eBECY(QMQ
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publicint getStartIndex(){ =o"sBVj
return startIndex; %HZ!s
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} X~; *zYd5
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publicvoid setStartIndex(int startIndex){ 5=MM^$QG
if(totalCount <= 0) oFGgr2Re
this.startIndex = 0; :SD3
elseif(startIndex >= totalCount) 6Vu??qBy
this.startIndex = indexes @yPI$"Ma
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[indexes.length - 1]; =8qhK=&]
elseif(startIndex < 0) =PBJ+"DQs
this.startIndex = 0; ^dhtc%
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else{ \w{fq+G
this.startIndex = indexes $/JnYkL{m
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[startIndex / pageSize]; 8=sMmpB 7u
} g'eJN
} 4~:D7",Jn
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publicint getNextIndex(){ H&ZsMML/%
int nextIndex = getStartIndex() + '&xRb*
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pageSize; O
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if(nextIndex >= totalCount) WgV[,(
return getStartIndex(); +7)/SQM5
else ^yF2xJ)9-
return nextIndex; ws}>swR,
} Cd'SPaR
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publicint getPreviousIndex(){ p7)b@,
int previousIndex = getStartIndex() - ;V~~lcD&Y`
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pageSize; 7\;gd4Ua1
if(previousIndex < 0) ?K?v64[
return0; flfE~_
else QW%BKF!
return previousIndex; [@t 6,g
} 3WdANR
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} .l&<-l;UQ
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抽象业务类 ~rU{Q>c
java代码: (svd~h e2
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/** J$<g"z3
* Created on 2005-7-12 _\xd]~ELj
*/ xSHeP`P^X
package com.javaeye.common.business; '||),>~
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import java.io.Serializable; vV9q5Bj:
import java.util.List; YVLaO*(f
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import org.hibernate.Criteria; q^w3n2
import org.hibernate.HibernateException; NCysYmt
import org.hibernate.Session; KEj-y+
import org.hibernate.criterion.DetachedCriteria; (PCv4:`g
import org.hibernate.criterion.Projections; 5zBsu lRt
import ~cx/>Hu
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org.springframework.orm.hibernate3.HibernateCallback; XmoS$/#"
import %sLij*
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org.springframework.orm.hibernate3.support.HibernateDaoS o93A:f c
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upport; d6k`=Hlg
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import com.javaeye.common.util.PaginationSupport; G" Fd]'
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public abstract class AbstractManager extends #zcnc$x\
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HibernateDaoSupport { BqKh&m
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privateboolean cacheQueries = false; P1
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privateString queryCacheRegion; 9m
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publicvoid setCacheQueries(boolean Ci
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cacheQueries){ o5FBqt
this.cacheQueries = cacheQueries; obE_`u l#
} 93d ht
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publicvoid setQueryCacheRegion(String xe6 2gaT
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queryCacheRegion){ nNFZ77lg
this.queryCacheRegion = tXTa>Q
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queryCacheRegion; Mc6?]wDB]
} AjZ@hid
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publicvoid save(finalObject entity){ ^kMgjS}R
getHibernateTemplate().save(entity); F+S;u=CKx
} i- E~ZfJ
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publicvoid persist(finalObject entity){ r,x;q
getHibernateTemplate().save(entity); *qE[Y0Cd
} f&Bu_r
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publicvoid update(finalObject entity){ ;
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getHibernateTemplate().update(entity); Hdh'!|w
} P$\vD^
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publicvoid delete(finalObject entity){ eRa1eRgP
getHibernateTemplate().delete(entity); '7{0k{
} !R WX1Z
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publicObject load(finalClass entity, S0~F$mP'
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finalSerializable id){ Ss&R!w9p
return getHibernateTemplate().load jv]:`$}G\
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(entity, id); fV_(P_C
} Dg@>d0FW
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publicObject get(finalClass entity, Px}#{fkS
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finalSerializable id){ U&/Jh^Yy
return getHibernateTemplate().get 9\i,3:Qc
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(entity, id); w8(qiU
} Tp`by
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publicList findAll(finalClass entity){ 'wX'}3_/g
return getHibernateTemplate().find("from h2u>CXD
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" + entity.getName()); !\8j[QS!
} 8+uwzBNZ:
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publicList findByNamedQuery(finalString J%;TK6
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namedQuery){ ewk62{
return getHibernateTemplate H>`?S{J
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().findByNamedQuery(namedQuery); Mx-,:a9}
} Vcl"qz@Fj
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publicList findByNamedQuery(finalString query, Ne.W-,X^cL
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finalObject parameter){ _#e='~;
return getHibernateTemplate bI=\n)sEz
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().findByNamedQuery(query, parameter); -rlxxLT+
} ]`y4n=L.
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publicList findByNamedQuery(finalString query, `yHV10
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finalObject[] parameters){ /z,sM"d
return getHibernateTemplate z8mR< q%`
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().findByNamedQuery(query, parameters); s%J|r{F6
} r 06}@ 7
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publicList find(finalString query){ :*6tbUp
return getHibernateTemplate().find {`~{%2ayq7
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(query); S0g5Ym
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} 2[Q*?N
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publicList find(finalString query, finalObject E'&UWDh
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parameter){ 3U@p
return getHibernateTemplate().find oWo"`"P
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(query, parameter); M:nXn7)+
} |z|5j!Nfh
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public PaginationSupport findPageByCriteria _4rb7"b1
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(final DetachedCriteria detachedCriteria){ = M7FD
return findPageByCriteria * "ER8\
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); P~i^V;g
} >RBq&'f
dt)
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public PaginationSupport findPageByCriteria -(qoz8H5
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(final DetachedCriteria detachedCriteria, finalint 0;3;Rs
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startIndex){ <i~ (
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return findPageByCriteria <h
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(detachedCriteria, PaginationSupport.PAGESIZE, 9.lSF
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startIndex); ]<4Yor}t{;
} /[GOs*{zB
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public PaginationSupport findPageByCriteria z>&Py(
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(final DetachedCriteria detachedCriteria, finalint V_~}7~
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pageSize, W2yNEiH
finalint startIndex){ bUAjt>+
return(PaginationSupport) LlRvm/
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getHibernateTemplate().execute(new HibernateCallback(){ ~DPg):cZ
publicObject doInHibernate {j,bV6X
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(Session session)throws HibernateException { ]NuY{T&:
Criteria criteria = FI*.2rdSR
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detachedCriteria.getExecutableCriteria(session); *2 4P T7
int totalCount = @*q\$Eg}2
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((Integer) criteria.setProjection(Projections.rowCount =@binTC4
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()).uniqueResult()).intValue(); %6L!JN
criteria.setProjection
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(null); ePIBg(
List items = lV`y6 {o#T
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criteria.setFirstResult(startIndex).setMaxResults vp4!p~C{
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(pageSize).list(); 6H VS0
PaginationSupport ps = W8yr06{]
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new PaginationSupport(items, totalCount, pageSize, |j^>6nE
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startIndex); t{!}^{
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return ps; kdQ=%
} E^1uZI\z
}, true); RX=C)q2c
} {^"c>'R
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public List findAllByCriteria(final )`-9WCd&
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DetachedCriteria detachedCriteria){ r&1N8o
return(List) getHibernateTemplate e@Z(z^V
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().execute(new HibernateCallback(){ yXppu[=
publicObject doInHibernate ^%#v
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(Session session)throws HibernateException { /_x?PiL
Criteria criteria = <R*.T)Z 1
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detachedCriteria.getExecutableCriteria(session); 0D|^S<z6
return criteria.list(); o*f7/ZP1o
} (IIOKx _
}, true); /r[0Dw
} 'e7<&wm ia
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public int getCountByCriteria(final SG8|xoL
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DetachedCriteria detachedCriteria){ D>?%p"e
Integer count = (Integer) lp!@uoN^T
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getHibernateTemplate().execute(new HibernateCallback(){ 1reJ7b0
publicObject doInHibernate G:c)e,pD
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(Session session)throws HibernateException { a`q">T%q
Criteria criteria = t \DS}3pv
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detachedCriteria.getExecutableCriteria(session); U,[vfSDGr
return rbO9NRg>
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criteria.setProjection(Projections.rowCount B\KvKT|\
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()).uniqueResult(); 1f~unb\Gg
} f@[q# }6
}, true); ]*%0CDY6`N
return count.intValue(); wcsUb9(
} N=zrY`Vd
} 3)atqM)i
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用户在web层构造查询条件detachedCriteria,和可选的 /XS}<!)%
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 eMPi ho
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PaginationSupport的实例ps。 tL 3]9qfj
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ps.getItems()得到已分页好的结果集 DFVaZN?~
ps.getIndexes()得到分页索引的数组 r*&gd