Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 \br!77
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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 !l:GrT8J
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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 =2Y;)wrF
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分页支持类: O%bbyR2
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java代码: 9T,/R1N8
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package com.javaeye.common.util; r*X,]\V0x
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import java.util.List; &Y@i:O
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publicclass PaginationSupport { +mQ5\14#
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publicfinalstaticint PAGESIZE = 30; Gp"GTPT{
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privateint pageSize = PAGESIZE; c_lHj#A(l
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privateList items; lj4Fg*/Yn
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privateint totalCount; Q&9yrx.
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privateint[] indexes = newint[0]; S-Uod y
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privateint startIndex = 0; .3!Wr*o
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public PaginationSupport(List items, int .sMs_ 5D
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totalCount){ C2
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setPageSize(PAGESIZE); ^X#y'odtbS
setTotalCount(totalCount);
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setItems(items); ! 'zd(kv<
setStartIndex(0); T$Z9F^w
} y^.66BH
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public PaginationSupport(List items, int }Zhe%M=}G
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totalCount, int startIndex){ x4_IUIgh
setPageSize(PAGESIZE); qJey&_
setTotalCount(totalCount); q"2QNF'
setItems(items); v.0qE}'
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setStartIndex(startIndex); ]#!uke Q
} ((y|?Z$
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public PaginationSupport(List items, int Fs+tcr/\[
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totalCount, int pageSize, int startIndex){ @W,jy$U
setPageSize(pageSize); )G[byBa
setTotalCount(totalCount); BK$y>=
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setItems(items); 'Zx5+rM${}
setStartIndex(startIndex); _e%D/}
} XLh)$rZ
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publicList getItems(){ FD=%
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return items; c*USA
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} AtT7~cVe
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publicvoid setItems(List items){ Qg> NJ\*Q
this.items = items; <-lM9}vd
} STKL
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publicint getPageSize(){ ts]e M1;
return pageSize; z^Hc'oVXj:
} 0<M-asI?
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publicvoid setPageSize(int pageSize){ $8EEtr,!
this.pageSize = pageSize; 1gI7$y+?
} -I< >Ab
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publicint getTotalCount(){ n#_B4UqW%
return totalCount; '
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} MK<
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publicvoid setTotalCount(int totalCount){ o3WOp80hz
if(totalCount > 0){ u?').c4
this.totalCount = totalCount; awLvLkQb{
int count = totalCount / pEyZH!W
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pageSize; [4KQcmJc#
if(totalCount % pageSize > 0) u@a){A(P
count++; y\Wn:RR1 [
indexes = newint[count]; 2+]5}'M
for(int i = 0; i < count; i++){ 1{uxpYAP=
indexes = pageSize * JsaXI:%1
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} 1]xk:u4LA
}else{ X><C#G
this.totalCount = 0; 8$FH;=
} n Ja!&G&
} %h.zkocM
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publicint[] getIndexes(){ "8za'@D"f
return indexes; q(sTKT[V
} i4D(8;
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publicvoid setIndexes(int[] indexes){ q<RjAi
this.indexes = indexes; )\wkVAm
} c[@_t.%)
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publicint getStartIndex(){ I| TNo-!$
return startIndex; f \&X$g
} pyEQb#
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publicvoid setStartIndex(int startIndex){ y6 (L=$+B
if(totalCount <= 0) 4[ uqsJB
this.startIndex = 0;
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elseif(startIndex >= totalCount) |mT%IR
this.startIndex = indexes .G/Rh92
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[indexes.length - 1]; z']6C9m}
elseif(startIndex < 0) xj5TnE9^
this.startIndex = 0; }:$cK(|
else{ ?;~!C2Zs
this.startIndex = indexes N2:Hdu:
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[startIndex / pageSize]; #N{]
} A%w9Da?B
} fECV\Z
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publicint getNextIndex(){ =7!s8D,[
int nextIndex = getStartIndex() + rfV'EjiM}
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pageSize; jUT`V
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if(nextIndex >= totalCount) *%uz LW0
return getStartIndex(); U~
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else E}wT5t;u
return nextIndex; C-pR$WM:HN
} \g0vzo"u
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publicint getPreviousIndex(){ !vX4_!%
int previousIndex = getStartIndex() - ?NE/}?a
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pageSize; .AN1Yt
if(previousIndex < 0) &M-vKc"d
return0; sRB=<E*_
else |v+z*}fKw
return previousIndex; 9J:|"@)N
} l|q-kRRjn
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} %/dOV[/
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抽象业务类 j"Jf|Hq $
java代码: |E~c#lV
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/** Dgz,Uad8f
* Created on 2005-7-12 nbxY'`8F
*/ 81nD:]7
package com.javaeye.common.business; )\])?q61
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import java.io.Serializable; Nu qmp7C
import java.util.List; eA N{BPN[
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import org.hibernate.Criteria; !'_7MM
import org.hibernate.HibernateException; !B`z|#
import org.hibernate.Session; #WjQ'c:
import org.hibernate.criterion.DetachedCriteria; $ :I{
import org.hibernate.criterion.Projections; ?j&hG|W9<z
import <zCWLj3
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org.springframework.orm.hibernate3.HibernateCallback; $SQ$2\iC
import [IHo
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org.springframework.orm.hibernate3.support.HibernateDaoS _DxHJl
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upport; 6UCF w>
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import com.javaeye.common.util.PaginationSupport; 2hV -h
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public abstract class AbstractManager extends H+*3e&
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HibernateDaoSupport { 4dixHpq'
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privateboolean cacheQueries = false; ;_\yg)X,
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privateString queryCacheRegion; =%8 yEb*5#
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publicvoid setCacheQueries(boolean @QTw9,pS
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cacheQueries){ l%}q&_
this.cacheQueries = cacheQueries; bci]"uzB
} <M\&zHv
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publicvoid setQueryCacheRegion(String E5i5gE"\
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queryCacheRegion){ g} !{_z
this.queryCacheRegion = \me5"ZU
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queryCacheRegion; )l9KDObis
} ECt<\h7}
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publicvoid save(finalObject entity){ e^lX|L>o
getHibernateTemplate().save(entity); +a39 !j
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} gcnX^[`S
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publicvoid persist(finalObject entity){ /"J 6``MV
getHibernateTemplate().save(entity); NCh-BinK@
} ;8oe-xS\+
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publicvoid update(finalObject entity){ %|JiFDjp
getHibernateTemplate().update(entity); W,EIBgR(R5
} Yuw:W:wY
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publicvoid delete(finalObject entity){ 7j)ky2r#
getHibernateTemplate().delete(entity); GXxI=,L8F
} ~~Bks{"BS
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publicObject load(finalClass entity, (rFiHv5
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finalSerializable id){ -E1-(TS
return getHibernateTemplate().load nrY)i_\
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(entity, id); :%&
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} -TVwoK
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publicObject get(finalClass entity, 3!8(A/YP;
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finalSerializable id){ `(HvD] l
return getHibernateTemplate().get `Pc6
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(entity, id); >3p~>;9sc
} E"9(CjbQ[
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publicList findAll(finalClass entity){ 7f+@6jqD\)
return getHibernateTemplate().find("from tTBDb
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" + entity.getName()); y?a71b8m
} tx7 zG.,
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publicList findByNamedQuery(finalString $ (;:4
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namedQuery){ !#pc@(rE
return getHibernateTemplate ;@=3
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().findByNamedQuery(namedQuery); ~bkO8tn
} k6M D3c
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publicList findByNamedQuery(finalString query, y>}r
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finalObject parameter){ R& t*x
return getHibernateTemplate l6#Y}<tq
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().findByNamedQuery(query, parameter); +r'&6Me!
} kf>3T@
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publicList findByNamedQuery(finalString query, =q0V%h{
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finalObject[] parameters){
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return getHibernateTemplate QTBc_Z
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().findByNamedQuery(query, parameters); ~\(c;J*Ir
} [ne51F5_
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publicList find(finalString query){ /%g9g_rt#
return getHibernateTemplate().find \_O#M
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(query); Z@1kx3Wx$
} d7](fw@c
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publicList find(finalString query, finalObject OGg\VV'
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parameter){ |P]W#~Y-
return getHibernateTemplate().find }O7sP^
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(query, parameter); UH-873AK
} rmzzbLTu
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public PaginationSupport findPageByCriteria "'bl)^+?,
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(final DetachedCriteria detachedCriteria){ Hh Q0>
return findPageByCriteria "\EX)u9ze
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); l S,Jo/T@
} 2c]"*Pb
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public PaginationSupport findPageByCriteria "7y,d%H
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(final DetachedCriteria detachedCriteria, finalint 7qyPI
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startIndex){ y:98}gW`n
return findPageByCriteria AC1RP`c
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(detachedCriteria, PaginationSupport.PAGESIZE, hUi@T}aA|
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startIndex); r|UJJ9i
} 1l$C3c
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public PaginationSupport findPageByCriteria GqxnB k1
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(final DetachedCriteria detachedCriteria, finalint UgAp9$=z
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pageSize, fY9+m}$S$
finalint startIndex){ SPE)db3
return(PaginationSupport) v^ @)&,
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getHibernateTemplate().execute(new HibernateCallback(){ rb-ao\
publicObject doInHibernate y#B=9Ri=z
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(Session session)throws HibernateException {
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Criteria criteria = x 4_MbUe
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detachedCriteria.getExecutableCriteria(session); v|(]u3=1_
int totalCount = nQmHYOF%
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((Integer) criteria.setProjection(Projections.rowCount nSyLt6zn\
+]cf/_8+s
()).uniqueResult()).intValue(); }
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criteria.setProjection 0\XWdTj{
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(null); .4^+q9M
List items = _aevaWtEx
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criteria.setFirstResult(startIndex).setMaxResults neM.M)0
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(pageSize).list(); ~'lT8 n_
PaginationSupport ps = IOZw[9](+
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new PaginationSupport(items, totalCount, pageSize, < 8'
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startIndex); yF(9=z"?
return ps; A#cFO)"
} i'li;xUhZ
}, true); Bza<.E=
} XiTi3vCe
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public List findAllByCriteria(final |p[Mp:^^
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DetachedCriteria detachedCriteria){ -+@N/d5
return(List) getHibernateTemplate n#x_da-m]
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().execute(new HibernateCallback(){ Pv5S k8
publicObject doInHibernate F%-@_IsG#
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(Session session)throws HibernateException { z)hK 2JD
Criteria criteria = 8%CznAO"?W
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detachedCriteria.getExecutableCriteria(session); MS;^:t1`
return criteria.list(); d]e36Dwk
} <8 <P,
}, true); KsOSPQDGE
} )!27=R/
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public int getCountByCriteria(final dPu27 "
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DetachedCriteria detachedCriteria){ Eh8GqFEM
Integer count = (Integer) DQY1oM)D!
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getHibernateTemplate().execute(new HibernateCallback(){ *d C| X
publicObject doInHibernate 5
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(Session session)throws HibernateException { m+'1c}n^7
Criteria criteria = -lJ|x>PG'
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detachedCriteria.getExecutableCriteria(session); ,JdBVt
return XA#qBxp/h
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criteria.setProjection(Projections.rowCount ]2m=lt1
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()).uniqueResult(); Z~Q5<A9Jz
} !QwB8yK@
}, true); acS~%^"<_
return count.intValue(); t#P7'9Se8
} |.Vgk8oTl
} v];YC6shx
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用户在web层构造查询条件detachedCriteria,和可选的 }}k%.Qb
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 x} =,'Ko}3
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PaginationSupport的实例ps。 ys[xR=nbD
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ps.getItems()得到已分页好的结果集 QaO9-:]eN
ps.getIndexes()得到分页索引的数组 t+A*Ws*o
ps.getTotalCount()得到总结果数 ^ulgZ2BQ|
ps.getStartIndex()当前分页索引 /95z1e
ps.getNextIndex()下一页索引 !QVhP+l'H
ps.getPreviousIndex()上一页索引 k^d]E F
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 ,$t1LV;o=
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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 tb?TPd-OY
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一下代码重构了。 #Db^*
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我把原本我的做法也提供出来供大家讨论吧: ugN%8N
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首先,为了实现分页查询,我封装了一个Page类: pSQX
java代码: " TCJT390
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/*Created on 2005-4-14*/ $'CS/U`E}
package org.flyware.util.page; r
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/** 1:<n(?5JI
* @author Joa p}==aNZK
* N>EMVUVS
*/ ,k.")
publicclass Page { j{FRD8]V
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/** imply if the page has previous page */ b'^<0c
privateboolean hasPrePage; E2}X[EoBF
&&$*MHJ
/** imply if the page has next page */
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privateboolean hasNextPage; b&E"r*i|
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/** the number of every page */ J0k!&d8
privateint everyPage; Tr>_R%b K
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/** the total page number */ 8)iI=,T*
privateint totalPage; zytW3sTZA
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/** the number of current page */ m==DBh
privateint currentPage; z+oy#p6+F.
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/** the begin index of the records by the current *lZ V3F
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query */ ~a
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privateint beginIndex; zE8_3UC
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/** The default constructor */ 0ie)$fi
public Page(){ Vq#0MY)2gS
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} 21<Sfsc$
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/** construct the page by everyPage Y[b08{/
* @param everyPage xv>8rW(Np5
* */ 9`qw,X&AK_
public Page(int everyPage){ #(}{*dR
this.everyPage = everyPage; FDF DB
} x/]G"?Uix
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/** The whole constructor */ (oCpQDab@
public Page(boolean hasPrePage, boolean hasNextPage, 8rJf2zL
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int everyPage, int totalPage, 7a_u=\,
int currentPage, int beginIndex){ SsMs#C8u%
this.hasPrePage = hasPrePage; ,,j> 2Ts
this.hasNextPage = hasNextPage; /w6'tut
this.everyPage = everyPage; $&,
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this.totalPage = totalPage; D?xR>Oo)
this.currentPage = currentPage; ?Nt m5(R
this.beginIndex = beginIndex; DV?c%z`YO
} _o?aO C
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/** w"kBAi&
* @return X/%!p<}:'
* Returns the beginIndex. It'kO jx]
*/ YJz06E1 -9
publicint getBeginIndex(){ !6taOT>v
return beginIndex; s 64@<oU<"
} &