Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 Ft@Wyo`^
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 j4R 4H;
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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 \NqEw@91B
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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 w#^U45y1v
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。 $iM=4
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分页支持类: ]/T-t1D
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java代码: SLhEc
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package com.javaeye.common.util; L"<B;u5pM
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import java.util.List; p[WX'M0f
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publicclass PaginationSupport { Fpt-V
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publicfinalstaticint PAGESIZE = 30; ,eQ[Fi!!
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privateint pageSize = PAGESIZE; 'xFYUU]#T^
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privateList items; hFvi5I-b
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privateint totalCount; Z v0C@r
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privateint[] indexes = newint[0]; cywg[
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privateint startIndex = 0; /9Ilo\MdD
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public PaginationSupport(List items, int 3hq1yyec
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totalCount){ >m_v5K
setPageSize(PAGESIZE); &2EBk= X
setTotalCount(totalCount); nEy]`
setItems(items); tk/`%Q
setStartIndex(0); *(cU]NUH_
} YYRT.U'
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public PaginationSupport(List items, int ^t'3rft
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totalCount, int startIndex){ Y(GN4@`S
setPageSize(PAGESIZE); |xr32gs
setTotalCount(totalCount); i9UI,b%X
setItems(items); uv4 _:
setStartIndex(startIndex); Wn!G.(Jq
} #Nte^E4
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public PaginationSupport(List items, int M+sj}
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totalCount, int pageSize, int startIndex){ 'nK~'PZ,
setPageSize(pageSize); PdY>#Cyh
setTotalCount(totalCount); v9}[$HWx
setItems(items); H]&!'\aUz
setStartIndex(startIndex); ;^l_i4A
} Su8'$CFz$.
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publicList getItems(){ ~"ONAX
return items; U
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} N_C_O$j
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publicvoid setItems(List items){ i#,1iVSG
this.items = items; j"<Y!Y3
} 015Owi
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publicint getPageSize(){ $<e +r$1
return pageSize; ccO
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} |*Ot/TvG
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publicvoid setPageSize(int pageSize){ Ku3!*n_\
this.pageSize = pageSize; $
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} wL<j:>Ke[3
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publicint getTotalCount(){ ;]&-MFv#
return totalCount; j%M @#
} ?^3B3qqh9
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publicvoid setTotalCount(int totalCount){ h3J*1
if(totalCount > 0){
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this.totalCount = totalCount; !C7<sZ`C
int count = totalCount / ez0 \bym
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pageSize; R^9"N?Q7;`
if(totalCount % pageSize > 0) F7uhuqA]N
count++; md6*c./Z
indexes = newint[count]; II#
for(int i = 0; i < count; i++){ w2)/mSnu
indexes = pageSize * * NMQ
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i; d5, FM
} ,cQ)cY[
}else{ uAb 03Q
this.totalCount = 0; #D:RhqjK
} sM9-0A
} u'@Ely
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publicint[] getIndexes(){ &^ceOV0+
return indexes; &V;x 4
} n49s3|#)G
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publicvoid setIndexes(int[] indexes){ 7sN0`7
this.indexes = indexes; x=3I)}J(kn
} 8g5.7{ky
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publicint getStartIndex(){ 8XkIk7
return startIndex; o@@w^##
} i -V0Lm/
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publicvoid setStartIndex(int startIndex){ ^HoJ.oC/
if(totalCount <= 0) coO.kTO;
this.startIndex = 0; %9YA^ri
elseif(startIndex >= totalCount) 7n>|D^
this.startIndex = indexes 2_Jb9:/X
C!kbZTO[p"
[indexes.length - 1]; T=yCN#cqQ`
elseif(startIndex < 0) c.6QhE
this.startIndex = 0; _pW'n=}R
else{ ?7 X3P
this.startIndex = indexes `NoCH[$!+
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[startIndex / pageSize]; 5z[6rT=a
} k^yy$^=<
} Q^kMCrp
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publicint getNextIndex(){ xF^r`
int nextIndex = getStartIndex() + L`JY4JM"
*q[^Q'jnN
pageSize; zlN+edgY#,
if(nextIndex >= totalCount) # m_\1&g
return getStartIndex(); Z_!9iA:X
else @hBx,`H^
return nextIndex; {8W |W2o$!
} ~vkud+r
2"_ 18l.
publicint getPreviousIndex(){ ` C ?a
int previousIndex = getStartIndex() - Cb<~i
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pageSize; 1(D1}fcul
if(previousIndex < 0) q2D`1nT
return0; ;?#i]Bh>S
else 6.vNe
return previousIndex; r6<ArX$Yl
} DvU~%%(0^
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} 2voNgY
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抽象业务类 -1#e^9Ve\
java代码: Vc{/o=1u
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/** Z|f^nH#-C
* Created on 2005-7-12 /}[zA@
*/ ..]B9M.
package com.javaeye.common.business; c
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import java.io.Serializable;
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import java.util.List; Rf&^th}TH
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}
import org.hibernate.Criteria; N n:m+ZDo^
import org.hibernate.HibernateException; mT}Aje-L
import org.hibernate.Session; Pm'.,?"
import org.hibernate.criterion.DetachedCriteria; sCuQB Z h
import org.hibernate.criterion.Projections; ]q@rGD85K
import 7?)m(CFy
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org.springframework.orm.hibernate3.HibernateCallback; if\k[O 1T6
import 9?v)
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org.springframework.orm.hibernate3.support.HibernateDaoS p3i
qW,[@
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upport; 6eVe}V4W
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import com.javaeye.common.util.PaginationSupport; ,2Sv1v$
7ZrJ#n8?ih
public abstract class AbstractManager extends g=)U_DPRi
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HibernateDaoSupport { i,\t]EJAU
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privateboolean cacheQueries = false; )yfOrsM
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privateString queryCacheRegion; ^2P;CAjj-
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publicvoid setCacheQueries(boolean `V$cz88b
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cacheQueries){ (2&K(1.Y
this.cacheQueries = cacheQueries; a2IV!0x
} L|vaTidc0
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publicvoid setQueryCacheRegion(String \["1N-q b
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queryCacheRegion){
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this.queryCacheRegion = jnx+wcd
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queryCacheRegion; 6+5(.z-[
} .T[!!z#^
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publicvoid save(finalObject entity){ Xb8:*Y1'
getHibernateTemplate().save(entity); b3jU~L$
} }6b7a1p
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publicvoid persist(finalObject entity){ \Mh4X`<e
getHibernateTemplate().save(entity); _,Io(QS
} gb ^UFD L
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publicvoid update(finalObject entity){ %t(, *;
getHibernateTemplate().update(entity); |ij W_r
} _r^G%Mvy|
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publicvoid delete(finalObject entity){ GNj/jU<o!
getHibernateTemplate().delete(entity); 1-ndJ@Wlz
} c9/
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publicObject load(finalClass entity, ahz@HX
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finalSerializable id){ :ok!,QN
return getHibernateTemplate().load fNmG`Ke
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(entity, id); 0 VWCm( f-
} UeC%Wa<[
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publicObject get(finalClass entity, 0*'`%W+5
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finalSerializable id){ (h8hg+l
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return getHibernateTemplate().get x Jj8njuq4
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(entity, id); HtS1N}@
} rVIb'sa
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publicList findAll(finalClass entity){ cnjj)
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return getHibernateTemplate().find("from [ a65VR~J
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" + entity.getName()); "|~B};|MFF
} EZa{C}NQ$2
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publicList findByNamedQuery(finalString ?geWR_Z
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namedQuery){ a#~Z5>{
return getHibernateTemplate y("0Xve
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().findByNamedQuery(namedQuery); M<|~MR
} 1\7"I-
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publicList findByNamedQuery(finalString query, Z-;uzx
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finalObject parameter){ %V" +}Dr
return getHibernateTemplate h-)A?%Xt
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().findByNamedQuery(query, parameter); ]!S)O|_D[
} emDvy2uA#
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publicList findByNamedQuery(finalString query, C.TCDl
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finalObject[] parameters){ $dWl A<u
return getHibernateTemplate 0e5-\a
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().findByNamedQuery(query, parameters); \]d*h]Hms
} b~jvmcr
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publicList find(finalString query){ h-v&I>
return getHibernateTemplate().find |jCE9Ve#
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(query); ]FnrbQ|
} ,uD*FSp>
} k%\
publicList find(finalString query, finalObject 0m|
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parameter){ e|+;j}^C
return getHibernateTemplate().find ,LW%'tQ~"
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(query, parameter); 5['B-
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} O|g!Y(
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public PaginationSupport findPageByCriteria F|ML$
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(final DetachedCriteria detachedCriteria){ C?c -V,
return findPageByCriteria p?gLW/n
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); SO jDtZ
} HjY-b*B
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public PaginationSupport findPageByCriteria Wg;TXs/
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(final DetachedCriteria detachedCriteria, finalint pQ2)M8 gf
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startIndex){ N?<@o2{
return findPageByCriteria ~ !+h"%'t
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(detachedCriteria, PaginationSupport.PAGESIZE, `"-!UkD+
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startIndex); mUY:S
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} p<nBS"/
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public PaginationSupport findPageByCriteria ~v,KI["o
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(final DetachedCriteria detachedCriteria, finalint 8`*9jr
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pageSize, "aO,
finalint startIndex){ KUqS(u
return(PaginationSupport) <{).x6
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getHibernateTemplate().execute(new HibernateCallback(){ /gy:#-2Gy
publicObject doInHibernate c(=O`%B{
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(Session session)throws HibernateException { HyYQQ
Criteria criteria = i3WmD@
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detachedCriteria.getExecutableCriteria(session); =}o>_+"
int totalCount = \ A UtGP
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((Integer) criteria.setProjection(Projections.rowCount
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()).uniqueResult()).intValue(); \6
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criteria.setProjection ?m7" G)
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(null); xla^A}{
List items = *b l{F\
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criteria.setFirstResult(startIndex).setMaxResults "RX5] eJc\
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(pageSize).list(); )Is*-
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PaginationSupport ps = 64j 4P 7
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new PaginationSupport(items, totalCount, pageSize, A,[m=9V
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startIndex); PC7.+;1
return ps; MAo,PiYb
} 5GxM?%\
}, true); 9wJmX<Rm
} [hj'Yg 8{
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public List findAllByCriteria(final %((3'le
K}(n;6\
DetachedCriteria detachedCriteria){ d_qVk4h\
return(List) getHibernateTemplate '\YhRU
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().execute(new HibernateCallback(){ %}5"5\Zz
publicObject doInHibernate 1mPS)X_
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(Session session)throws HibernateException { w%-!dbmb%
Criteria criteria = )g<qEyJR
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detachedCriteria.getExecutableCriteria(session); sO-R+G/^7
return criteria.list(); 3n)iTSU3
} %,q#f#
}, true); Cx'=2Y 7
} IL"#TKKv
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public int getCountByCriteria(final VQx-gm8}!
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DetachedCriteria detachedCriteria){ R~(.uV`#j
Integer count = (Integer) IHmNi>E&/
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getHibernateTemplate().execute(new HibernateCallback(){ g%P4$|C9i
publicObject doInHibernate Vta;ibdeqW
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(Session session)throws HibernateException { df rr.i
Criteria criteria = 3AL=*qq
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detachedCriteria.getExecutableCriteria(session); mpAh'f4$*
return LMzYsXG*[
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criteria.setProjection(Projections.rowCount ebVfny$D
x G"p.
()).uniqueResult(); mW9b~G3k
}
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}, true); ^Wz{su2
return count.intValue(); 0].5[Jo
} 'Em($A(
} Di=6.gm[<
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用户在web层构造查询条件detachedCriteria,和可选的 ?`}U|]c
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 9:~^KQ{?
jzp%.4/j
PaginationSupport的实例ps。 hlEvL
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ps.getItems()得到已分页好的结果集 'z5 ;o:T
ps.getIndexes()得到分页索引的数组 2*FZ@?X@r
ps.getTotalCount()得到总结果数 3=I Q
ps.getStartIndex()当前分页索引 C@W0fz
ps.getNextIndex()下一页索引 5toNEDN
ps.getPreviousIndex()上一页索引 46`{mPd{aO
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 mL+ps x+
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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 %hQ`b$07t
Z)0R$j`2
一下代码重构了。 -fn~y1
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我把原本我的做法也提供出来供大家讨论吧: }c:0cl
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首先,为了实现分页查询,我封装了一个Page类: 9r}}m0
java代码: b5C #xxIO
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/*Created on 2005-4-14*/ >MLqOUr#
package org.flyware.util.page; ~Q\[b%>J
pTd@i1%Nr
/** i ib-\j4d
* @author Joa d4tVK0
~
* $>Do&TU
*/ p!
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publicclass Page { iLei-\w6y
vzPrG%Uu7g
/** imply if the page has previous page */ -K4RQ{=>UZ
privateboolean hasPrePage; "
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/** imply if the page has next page */ YTsn;3d]}
privateboolean hasNextPage; V#Eq74ic
aqgSr|
/** the number of every page */ [;+YO)
privateint everyPage; xNU}uW>>T
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/** the total page number */ Ns{4BM6j
privateint totalPage; 4BX*-t
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/** the number of current page */ -#h
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privateint currentPage; eS M!_2
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/** the begin index of the records by the current kQtl&{;k?
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query */ J<D =\
privateint beginIndex; 3@ SfCG&|e
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/** The default constructor */ 8cl!8gfv
public Page(){ }z6HxB]$
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} L[efiiLh$
p*G_$"KpP
/** construct the page by everyPage z> SCv;Q
* @param everyPage =Vfj#WL
* */ )U?W+0[=
public Page(int everyPage){ pVM;xxJ
this.everyPage = everyPage; [iz
} TzjZGs W[V
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/** The whole constructor */ Fwtwf{9I
public Page(boolean hasPrePage, boolean hasNextPage, ~Km8-b(&
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int everyPage, int totalPage, 0nX5
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int currentPage, int beginIndex){ %"tf`,d~3
this.hasPrePage = hasPrePage; gxiJ`.D=
this.hasNextPage = hasNextPage; sz5@=
this.everyPage = everyPage; ! JN@4
this.totalPage = totalPage; XT\;2etVL
this.currentPage = currentPage; |?8wyP
this.beginIndex = beginIndex; Oc1ZIIkh\
} BC^WPr
lsd\ `X5,
/** (s*}=
* @return QLn5:&
* Returns the beginIndex. K4~dEZ
*/ Sq,x@
publicint getBeginIndex(){ dbR4%;<
return beginIndex; 6BMn7m?
} am=56J$ig
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/** /W;;7k
* @param beginIndex tSjK=1"}
* The beginIndex to set. F+X3CB,f
*/ QJ
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publicvoid setBeginIndex(int beginIndex){ a^N/N5-Z
this.beginIndex = beginIndex; [Z 1Eje X
} t{ 'QMX
(NP=5lLH
/** GIp?}tM
* @return n
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* Returns the currentPage. hd900LA}
*/ p"ZPv~("V
publicint getCurrentPage(){ d7@ N~<n
return currentPage; PO#FtG
} FU<rE&X2:
}k%>%xQ.
/** 5<61NnZ
* @param currentPage _=rXaTp
* The currentPage to set. d 1z
*/ Ofn:<d
publicvoid setCurrentPage(int currentPage){ L^22,B
0
this.currentPage = currentPage; p47~vgJN
} Mc.KLz&,FC
~"(1~7_
/** `g #\ Ws
* @return 6;VlX,,j
* Returns the everyPage. McfSB(59
*/ /g21.*Z
publicint getEveryPage(){ 3.>jagu
return everyPage; <1ai0]
} HtMlSgx,8>
Z"P{/~HG
/** @9^kl$
* @param everyPage :x_l"y"
* The everyPage to set. W1#3+
*/ {T$;BoR#O
publicvoid setEveryPage(int everyPage){ y
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this.everyPage = everyPage; d;f,vN(
} 0FXM4YcrJO
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/** 8F%TZM
* @return M 3^p,[9r#
* Returns the hasNextPage. lcih
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*/ /8.;
publicboolean getHasNextPage(){ ;$nK
^
return hasNextPage; m^`X|xK-
} b*,R9
SN+&'?$WD
/** 3>;U||O
* @param hasNextPage RgEUTpX
* The hasNextPage to set.
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*/ MjHeUf
publicvoid setHasNextPage(boolean hasNextPage){ ]TGJ|X
this.hasNextPage = hasNextPage; :D&QGw(n
} ^ K/B[8
`W"-jz5#=
/** $
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* @return &98qAO]Z
* Returns the hasPrePage. F
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*/ n6oVx5/
publicboolean getHasPrePage(){ $UKDXQF"
return hasPrePage; |>VHV} 4)<
} h1,J<B@
L&l>?"_
/** E#T'=f[r~
* @param hasPrePage bMgp
* The hasPrePage to set. :5;[Rg5
2
*/ lG q;kIQ
publicvoid setHasPrePage(boolean hasPrePage){ JG4Tb{F=
this.hasPrePage = hasPrePage; T
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} Xa-]+_?Q
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/** [<cP~
* @return Returns the totalPage. YV0e)bf
* &H*F
*/ zm"& 8/l
publicint getTotalPage(){ ${`\In_?O
return totalPage; XxV]U{i!
} qbB.Z#w
brZ3T`p+.P
/** wp$SO^?-
* @param totalPage LM0TSB?
* The totalPage to set. ucTkWqG
*/ -6#i~a]
publicvoid setTotalPage(int totalPage){ /Z\zB
this.totalPage = totalPage; I_v]^>Xw
} 9n$$D;
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je
} i;yz%Ug
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#[J..i/h
AX[/S8|6
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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 `lr\V;o!
Jg^tr>I~
个PageUtil,负责对Page对象进行构造: SxMh '
java代码: gm4-w 9M[p
:s*&_y
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/*Created on 2005-4-14*/
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package org.flyware.util.page; _)lK.5
DAJh9I
import org.apache.commons.logging.Log; 'M YqCfIK
import org.apache.commons.logging.LogFactory; 2Ask]
-0lpsF
/** O=ci"2!\-
* @author Joa g`\Vy4w
* NeUpl./b
*/ %$Mvq&ZZ
publicclass PageUtil { M,|o 2'
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privatestaticfinal Log logger = LogFactory.getLog VAV@Qn
IC7n;n9
(PageUtil.class); (,HAOs
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/** yU&A[DZQ
* Use the origin page to create a new page B-JgXW.\0
* @param page CfA
F.H
* @param totalRecords ePB=aCZ
* @return wXfy,W
*/ >(*jL
publicstatic Page createPage(Page page, int <Eq^rh
rXvvJIbi
totalRecords){ l0Y(9(M@
return createPage(page.getEveryPage(), foaNB=,
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page.getCurrentPage(), totalRecords); $O7>E!uVD
} 65qH
v='7.A
/** eRC@b^~
* the basic page utils not including exception
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IN),Lu0K
handler {U7j
* @param everyPage X2Y-TET
* @param currentPage amgYr$)m
* @param totalRecords NcRY
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* @return page QfRt3\^`
*/ mLKwk6I
publicstatic Page createPage(int everyPage, int )";g*4R[
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currentPage, int totalRecords){ g7#_a6
everyPage = getEveryPage(everyPage);
,!PNfJA2
currentPage = getCurrentPage(currentPage); dLG5yx\js
int beginIndex = getBeginIndex(everyPage, %]RzC`NZ
F71.%p7C8"
currentPage); Bglh}_X
int totalPage = getTotalPage(everyPage, ytr~} M%
<