Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Sf:lN4
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 C:EoUu
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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 hs uJ;4}$q
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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 5DUPsV
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分页支持类: 1T?%i
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java代码: }X:r:{r
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package com.javaeye.common.util; XArLL5_L
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import java.util.List; bFXCaD!{G
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publicclass PaginationSupport { PelV67?M
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publicfinalstaticint PAGESIZE = 30; MT g Eq
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privateint pageSize = PAGESIZE; $&C%C\(>D
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privateList items; `<Nc
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privateint totalCount; o>%W7@Pr
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privateint[] indexes = newint[0]; u8=|{)yL
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privateint startIndex = 0;
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public PaginationSupport(List items, int %.Y`X(g6/
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totalCount){ 8Qy |;T}
setPageSize(PAGESIZE); K_.x(Z(;4
setTotalCount(totalCount); (dZ&Af
setItems(items); #2=3 0
setStartIndex(0); C`K/ai{4
} QKQy)g
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public PaginationSupport(List items, int ArMe[t0$
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totalCount, int startIndex){ @@&;gWr;
setPageSize(PAGESIZE); t|_g O!w8
setTotalCount(totalCount); q[g^[~WM#
setItems(items); Iqv
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setStartIndex(startIndex); A;PV,2|X
} |.yRo_
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public PaginationSupport(List items, int K~G^jAk+
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totalCount, int pageSize, int startIndex){ `R;XN-
setPageSize(pageSize); ;[ojwcK[ZF
setTotalCount(totalCount); d1TG[i<J_
setItems(items); (Zkt2[E`
setStartIndex(startIndex); Yr@ @ty
} .kV/0!q?
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publicList getItems(){ 5#tvc4+)
return items; C5FtJquGN)
} c-{]H8$v
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publicvoid setItems(List items){ p};<l@
this.items = items; W'yICt(#G
} Fx 2&ji6u
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publicint getPageSize(){ 6A<aelE*i
return pageSize; ~C3-E %h@Z
} K[Kc'6G
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publicvoid setPageSize(int pageSize){
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this.pageSize = pageSize; QBg'VV
} ,P]{*uqGiB
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publicint getTotalCount(){ 57rP@,vj
return totalCount; bcg)K`'N
} A,@"(3
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publicvoid setTotalCount(int totalCount){ x8t1g,QA
if(totalCount > 0){ ,;;~dfHm
this.totalCount = totalCount; f}A^rWO
int count = totalCount / Px`yD3
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pageSize; iZF{9@
if(totalCount % pageSize > 0) ;+\;^nS3d
count++; /V~(!S>
indexes = newint[count]; 5NK:94&JE
for(int i = 0; i < count; i++){ [ q}WS5Cp
indexes = pageSize * 7O j9~3o4
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} a?dM8zAnc
}else{ TM9>r :j'
this.totalCount = 0; G1BVI:A&S
} dBkB9nz
} Z2r\aZ-d`
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publicint[] getIndexes(){ b`'
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return indexes; Mmn[ol
} ) PtaX|U
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publicvoid setIndexes(int[] indexes){ ;Ti?(n#M>
this.indexes = indexes;
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} G{<wXxq%
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publicint getStartIndex(){ 3!I8J:GZ:
return startIndex; /W;;7k
} X~0P+E#
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publicvoid setStartIndex(int startIndex){ B{Rig5Sc
if(totalCount <= 0) D6D*RTi4
this.startIndex = 0; @#p4QEQA
elseif(startIndex >= totalCount) H74hv`G9
this.startIndex = indexes p"ZPv~("V
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[indexes.length - 1]; XHV+Y+VG
elseif(startIndex < 0) 5<61NnZ
this.startIndex = 0; ^T"A9uaG
else{ IMBqy -q
this.startIndex = indexes >DDQ7
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[startIndex / pageSize]; 'Mg%G(3
} TYp{nWwi
} f!87JE=<
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publicint getNextIndex(){ #ws6z`mt
int nextIndex = getStartIndex() + (7"qT^s3
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pageSize; CNzK-,
if(nextIndex >= totalCount) q,2
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return getStartIndex(); tZ(Wh
else ]O 2_&cs
return nextIndex; Re=bJ|wo
} |^FDsJUN
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publicint getPreviousIndex(){ r/PsFv{8
int previousIndex = getStartIndex() - H`fkds
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pageSize; `toSU>:
if(previousIndex < 0) -WEiY
return0; 3b|.L
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else 9~N7hLT
return previousIndex; z%b3/rx
} 1cUC>_%?
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抽象业务类 \2W( >_z
java代码: eK]GyY/Y
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/** 1V)0+_Yv
* Created on 2005-7-12 h4sEH
*/ #LF_*a0v
package com.javaeye.common.business; wjpkh~qo
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import java.io.Serializable; ^ 3Vjmv
import java.util.List; =PXNg!B}D*
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import org.hibernate.Criteria; H3MT.Cpd
import org.hibernate.HibernateException; KPKby?qQ^
import org.hibernate.Session; 6?2/b`k
import org.hibernate.criterion.DetachedCriteria; P^+Og_$
import org.hibernate.criterion.Projections; \}Hk`n)Aq
import l@##
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org.springframework.orm.hibernate3.HibernateCallback; {?, :M
import P%.9 g
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org.springframework.orm.hibernate3.support.HibernateDaoS &AA u:
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upport; $yRbo'-
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import com.javaeye.common.util.PaginationSupport; AQ@A$
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public abstract class AbstractManager extends ))u$j4V
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HibernateDaoSupport { +STT(b Mn
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privateboolean cacheQueries = false; v^JyVf>
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privateString queryCacheRegion; B7va#'ne4{
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publicvoid setCacheQueries(boolean 9NKZE?5P|D
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cacheQueries){ _/7[=e}y
this.cacheQueries = cacheQueries; W&6ye
} ;z!~-ByzL
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publicvoid setQueryCacheRegion(String !j [U
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queryCacheRegion){ $
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this.queryCacheRegion = Z5_MSPm
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queryCacheRegion; (eG#JVsm9
} yP~D."
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publicvoid save(finalObject entity){ G`gYwgU;
getHibernateTemplate().save(entity); B
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} u]CW5snz
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publicvoid persist(finalObject entity){ sLb[ZQ;j
getHibernateTemplate().save(entity); H#G'q_uHH
} PJ9JRG7j
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publicvoid update(finalObject entity){ r's4-\
getHibernateTemplate().update(entity); 7RTp+FC]
} dAohj
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publicvoid delete(finalObject entity){ O" n /.`
getHibernateTemplate().delete(entity); P#"vlNa
} %F1 Ce/
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publicObject load(finalClass entity, ]@>bz
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finalSerializable id){ X2T)]`@
return getHibernateTemplate().load 5>"-lB &
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(entity, id); 592q`m\
} f GY. +W_
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publicObject get(finalClass entity, N^CD4l
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finalSerializable id){ [P,1UO|$B
return getHibernateTemplate().get ;g7nG{
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(entity, id); -i7W|X"
} 4: 5 CnK
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publicList findAll(finalClass entity){ !2$O^
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return getHibernateTemplate().find("from 67')nEQ9
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" + entity.getName()); =AGsW
} K%$%9y
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publicList findByNamedQuery(finalString &3'II:x(
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namedQuery){ )$ i7b
return getHibernateTemplate HmAA?J}
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().findByNamedQuery(namedQuery); ?UQE;0 B
} ,d@.@a]
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publicList findByNamedQuery(finalString query, @ 4j#X
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finalObject parameter){ ]7fqVOiOu
return getHibernateTemplate J'.U+XU
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().findByNamedQuery(query, parameter); LH3PgGi,
} e:6R +8s2
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publicList findByNamedQuery(finalString query, 5<Xq7|Jt
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finalObject[] parameters){ CXb)k.L
return getHibernateTemplate lpj$\WI=
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().findByNamedQuery(query, parameters); `` 6?;Y
} C$b$)uI;
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publicList find(finalString query){ +}J2\!Jw
return getHibernateTemplate().find w-"o?;)a
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(query); yv[s)c}
} vB#&XK.aW
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publicList find(finalString query, finalObject U8\[8~Xftn
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parameter){ th2a'y=0
return getHibernateTemplate().find ZH~ T'Bg
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(query, parameter); ?6; +.h\
} K#}DXq
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public PaginationSupport findPageByCriteria k]] (I<2
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(final DetachedCriteria detachedCriteria){ #y~^!fdp9
return findPageByCriteria x$cs_q]J
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); 4M}u_}9
} F9^8/Z
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public PaginationSupport findPageByCriteria 3;u* _ ]N_
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(final DetachedCriteria detachedCriteria, finalint 9axJ2J'g
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startIndex){ kz@@/DD/9
return findPageByCriteria o2He}t2o
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(detachedCriteria, PaginationSupport.PAGESIZE, )ZEUD] X
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startIndex); 7xb z)FI
} wyMj^+ 2m
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public PaginationSupport findPageByCriteria ,)@Q,EHN;
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(final DetachedCriteria detachedCriteria, finalint Vp.($
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pageSize, .#2YJ~
finalint startIndex){ pE[ul
return(PaginationSupport) c6:"5};_
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getHibernateTemplate().execute(new HibernateCallback(){ jV;&*4if
publicObject doInHibernate zZ3,e L
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(Session session)throws HibernateException { Em N0K'x
Criteria criteria = Bmm#5X@*
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detachedCriteria.getExecutableCriteria(session); ^z-e"
int totalCount = hw:zak#j,
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((Integer) criteria.setProjection(Projections.rowCount -n?}L#4%8
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()).uniqueResult()).intValue(); 3)^-A4~E
criteria.setProjection {.GC7dx
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(null); r DX_$,3L
List items = Z$ {I4a
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criteria.setFirstResult(startIndex).setMaxResults TL ;2,@H`
+/*g?Vt
(pageSize).list(); 4&~ft
PaginationSupport ps = *Em 9R
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new PaginationSupport(items, totalCount, pageSize, .iNPLz1
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startIndex); 'j6PL;~c
return ps; qsk8 #
} *y9 iuJ}
}, true); 9&q<6TZ z
} rR@ t5
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public List findAllByCriteria(final {}H5%W
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DetachedCriteria detachedCriteria){ W'hE,
return(List) getHibernateTemplate zM%ILv4
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().execute(new HibernateCallback(){ .?UK`O2Q
publicObject doInHibernate vE0Ty9OH"]
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(Session session)throws HibernateException { lG;RfDI-
Criteria criteria = *G7$wW:?
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detachedCriteria.getExecutableCriteria(session); qcEiJ}-
return criteria.list(); Y0:y72mK
} 8`XT`H
}, true); n|dLK.Q
} .%j(!
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public int getCountByCriteria(final r+-KrO'
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DetachedCriteria detachedCriteria){ /PH+K24v~
Integer count = (Integer) u0`~
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getHibernateTemplate().execute(new HibernateCallback(){ Kf2Ob1
publicObject doInHibernate +QT(~<
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(Session session)throws HibernateException { n0 q5|ES
Criteria criteria = r e.chQ6
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detachedCriteria.getExecutableCriteria(session); 3&.?9
return mE^mQ [Dk
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criteria.setProjection(Projections.rowCount [h SE^
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()).uniqueResult(); fz#e4+oH
} R
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}, true); vU0j!XqE
return count.intValue(); OQ;'Xo
} Oaf!\z}
} I9O!CQCTt
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用户在web层构造查询条件detachedCriteria,和可选的 KoVy,@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 0(\ybppx
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PaginationSupport的实例ps。 (dn(:<_$
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ps.getItems()得到已分页好的结果集 12BTZ
ps.getIndexes()得到分页索引的数组 0j\?zt?
ps.getTotalCount()得到总结果数 Se7NF@>9_
ps.getStartIndex()当前分页索引 V1 T?T9m
ps.getNextIndex()下一页索引 1^ZQXUzl%i
ps.getPreviousIndex()上一页索引 <