Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 YgeU>I|v
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 S7I8BS[*v
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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 VSxls
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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 4X()D {uR
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分页支持类: |?kZfr&9q
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java代码: W@T_-pTCjK
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package com.javaeye.common.util; "F$0NYb]I
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import java.util.List; aS7%x>.A!
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publicclass PaginationSupport { P+hp'YK1
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publicfinalstaticint PAGESIZE = 30; .Lvg
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privateint pageSize = PAGESIZE; qMA K"%x
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privateList items; jgkJF[t`
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privateint totalCount; ]Zj6W9]m
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privateint[] indexes = newint[0]; #Fl5]> |
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privateint startIndex = 0; Bl
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public PaginationSupport(List items, int ,o_Ur.UJ
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totalCount){ E2
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setPageSize(PAGESIZE); RjOQSy3
setTotalCount(totalCount); On^jHqLaE
setItems(items); ckZZ)lW`*
setStartIndex(0); r2Wx31j{
} }IRx$cKV
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public PaginationSupport(List items, int +(*;F4>
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totalCount, int startIndex){ 6z (eW]p
setPageSize(PAGESIZE); XQH
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setTotalCount(totalCount); \k8| 3Y~g
setItems(items); 9qqzCMrI0e
setStartIndex(startIndex); Y?^1=9?6
} '%D$|)
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public PaginationSupport(List items, int oI!L2
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totalCount, int pageSize, int startIndex){ T9c=As_EM
setPageSize(pageSize); s[ CnJZ\q
setTotalCount(totalCount); 0(
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setItems(items);
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setStartIndex(startIndex); bay7%[BLB
} f\Fk+)e@
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publicList getItems(){ )R QX1("O
return items; j.5;0b_L^
} 9Xr @ll
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publicvoid setItems(List items){ nhUL{ER
this.items = items; ^J([w~&
} uAWmg8
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publicint getPageSize(){ CUS^j
return pageSize; .hD2g"
} ?^# h|aUp.
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publicvoid setPageSize(int pageSize){ *@C4~Zo
this.pageSize = pageSize; N1O& fMz
} jv"^_1
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publicint getTotalCount(){ =Wl*.%1 b
return totalCount; JE`mB}8s/
} [\j@_YYd
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publicvoid setTotalCount(int totalCount){ fO4e[g;G
if(totalCount > 0){ %/^kr ZD
this.totalCount = totalCount; Xgy)Z:R
int count = totalCount / s 4Mi9h_
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pageSize; wc-ll&0Z
if(totalCount % pageSize > 0) qlUw;{;p
count++; 7jb{E+DrG
indexes = newint[count]; &I[ITp6y0
for(int i = 0; i < count; i++){ =uYz4IDB
indexes = pageSize * }x[d]fcC
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} pY3N7&m\:
}else{ Ozygr?*X
this.totalCount = 0; ~okIiC]#
} bi fi02
} G]Jchg <
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publicint[] getIndexes(){ $jd>=TU|
return indexes; ^GXy:S$
} .>(?c92
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publicvoid setIndexes(int[] indexes){ A/ eZ!"Y
this.indexes = indexes; HzO6hb{jJO
} YzcuS/~x
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publicint getStartIndex(){ R|Oy/RGY$
return startIndex; 5 i1T?
} IZm_/
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publicvoid setStartIndex(int startIndex){ !U,^+"l'GP
if(totalCount <= 0) -jZP&8dPH
this.startIndex = 0; /nK)esB1L
elseif(startIndex >= totalCount) bw@DcT&,
this.startIndex = indexes qM`XF32A$
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[indexes.length - 1]; ez2 gy"
elseif(startIndex < 0) nP9@yI*7
this.startIndex = 0; ~YIGOL"?
else{ >`jsUeS
this.startIndex = indexes [;c'o5M&
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[startIndex / pageSize]; C?n3J
} 1MtvnPY
} W#<&(s4
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publicint getNextIndex(){ vT<q zN
int nextIndex = getStartIndex() + 26fm}QV
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pageSize; HQ%-e5Q
if(nextIndex >= totalCount) 8s4y7%,|
return getStartIndex(); VV(>e@Bc4
else wHW";3w2~
return nextIndex; @jW_
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} U!F~><
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publicint getPreviousIndex(){ bQ-5uFe~$B
int previousIndex = getStartIndex() - (~oUd4
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pageSize; rK*s/mX <
if(previousIndex < 0) =&*:)
return0; eNlE]W,=
else xMsos?5}
return previousIndex; Q6y883>9
} c7j^OP
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} 47_4`rzy;
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抽象业务类 U,C
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java代码: <^,w,A
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/** I)ub='+&;
* Created on 2005-7-12 d"+zDc;
*/ b=a&!r5M
package com.javaeye.common.business; DCb\=E
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import java.io.Serializable; C
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import java.util.List; >_U)=q
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import org.hibernate.Criteria; t=iSMe
import org.hibernate.HibernateException; (veGztt
import org.hibernate.Session; OiX>^_iDt
import org.hibernate.criterion.DetachedCriteria; R2Fh
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import org.hibernate.criterion.Projections; N<+
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import FG7}MUu
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org.springframework.orm.hibernate3.HibernateCallback; zpr`
import #NVtZs!V/
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org.springframework.orm.hibernate3.support.HibernateDaoS v$"#9oh
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upport; cTmoz.0
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import com.javaeye.common.util.PaginationSupport; ,#&lNQ'I
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public abstract class AbstractManager extends R8UtX9'*sa
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HibernateDaoSupport { V'~]b~R
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privateboolean cacheQueries = false; km'3[}8o&
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privateString queryCacheRegion; =,KRZqz
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publicvoid setCacheQueries(boolean =?T\zLN=
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cacheQueries){ jdQ`Y+BC
this.cacheQueries = cacheQueries; B2VC:TG>
} 4)+MvKxjS
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publicvoid setQueryCacheRegion(String xf<D5 olZ
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queryCacheRegion){ g5R2a7
this.queryCacheRegion = "JAYTatO7H
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queryCacheRegion; X>EwJ"q#
} KgX~PP>
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publicvoid save(finalObject entity){ fM?HZKo
getHibernateTemplate().save(entity); eIK8J,-
} M4pEwD
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publicvoid persist(finalObject entity){ W$ #FM$U
getHibernateTemplate().save(entity); |{+D65R
} x)l}d3
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publicvoid update(finalObject entity){ H1rge<
getHibernateTemplate().update(entity); Bvzl*
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} (%"M% Qko
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publicvoid delete(finalObject entity){ 9kL'"0c
getHibernateTemplate().delete(entity); MFcN.M
} L=3^A'|
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publicObject load(finalClass entity, 6Lz{/l8
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finalSerializable id){ dG}fpQ3&
return getHibernateTemplate().load X{\>TOk
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(entity, id); mb~w .~%
} bwUsE U 0
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publicObject get(finalClass entity, |;ycEB1
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finalSerializable id){ RS!~5nk5
return getHibernateTemplate().get AJ` b-$Q
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(entity, id); LF* 7;a
} R<lj$_72Q
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publicList findAll(finalClass entity){ {co(w
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return getHibernateTemplate().find("from /=>z|?z3
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" + entity.getName()); /Z HuT=j1
} HT)b3Ws~M8
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publicList findByNamedQuery(finalString ;!DUN zl
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namedQuery){ P}N%**>`
return getHibernateTemplate 1U.se`L
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().findByNamedQuery(namedQuery); ~b/lr
} >|WNsjkU%
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publicList findByNamedQuery(finalString query, u*Z>&]W_
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finalObject parameter){ G$XvxJ
return getHibernateTemplate bPEf2Z
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().findByNamedQuery(query, parameter); ?Q[uIQ?dV
} z8{ kwz
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publicList findByNamedQuery(finalString query, J?Brnf.
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finalObject[] parameters){ \.2?951}
return getHibernateTemplate 9KRHo%m
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().findByNamedQuery(query, parameters); wv<D%nF2|
} /+pbO-r W*
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publicList find(finalString query){ /R^Moj<
return getHibernateTemplate().find wx nD3
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(query); u@5vK2
} rCi7q]_
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publicList find(finalString query, finalObject i<&*f}='
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parameter){ 9%WUh-|'p
return getHibernateTemplate().find Ks.m5R
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(query, parameter); A|1
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} 9YRoWb{y
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public PaginationSupport findPageByCriteria 0gO<]]M?
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(final DetachedCriteria detachedCriteria){ uN20sD}
return findPageByCriteria Q1 ?O~ao
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); jOj`S%7
} &M(=#pq9
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public PaginationSupport findPageByCriteria L9nv05B
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(final DetachedCriteria detachedCriteria, finalint w|:UTJ>@
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startIndex){ 5_Yl!=
return findPageByCriteria {$z )7s
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(detachedCriteria, PaginationSupport.PAGESIZE, FVM:%S
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startIndex); bg;NBoZd
} gXN#<g,:^
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public PaginationSupport findPageByCriteria D,%R[F?5O
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(final DetachedCriteria detachedCriteria, finalint l0AgW_T
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pageSize, z2Sp
finalint startIndex){ !c-Ie~GIT
return(PaginationSupport) wEL$QOu$
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getHibernateTemplate().execute(new HibernateCallback(){ RNGTSz
publicObject doInHibernate Z&FC:4!!
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(Session session)throws HibernateException { Xr\|U89P
Criteria criteria = ^]c/hb|X
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detachedCriteria.getExecutableCriteria(session); dK'?<w$
int totalCount = 9z7^0Ruw
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((Integer) criteria.setProjection(Projections.rowCount "+3p??h%Rq
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()).uniqueResult()).intValue(); Kn3qq
criteria.setProjection 9n{tbabJ
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(null); e^kccz2f
List items = )1ia;6}
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criteria.setFirstResult(startIndex).setMaxResults ~$XbYR-
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(pageSize).list(); owL>w
PaginationSupport ps = `s#0/t
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new PaginationSupport(items, totalCount, pageSize, WNSf$D{p
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startIndex); KrE:ilm#^Y
return ps; Dyv 6K_,
} H59}d
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}, true); G)5w_^&%
} 0<*R 0
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public List findAllByCriteria(final [1Pw2MC<
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DetachedCriteria detachedCriteria){ ;;rEv5 /
return(List) getHibernateTemplate n'R9SnW
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().execute(new HibernateCallback(){ )RA$E`!b
publicObject doInHibernate 's]I:06A
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(Session session)throws HibernateException { Ut:>'TwG
Criteria criteria = -o c@$*t
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detachedCriteria.getExecutableCriteria(session); iu!j#VO
return criteria.list(); Uywi,9f
} }T=0]u4,
}, true); q\wT[W31@
} ERcj$ [:T(
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public int getCountByCriteria(final r.1/*i
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DetachedCriteria detachedCriteria){ Wr+?ul*_
Integer count = (Integer) gP=(2EVE
} :U'aa
getHibernateTemplate().execute(new HibernateCallback(){ L=Cm0q 3v
publicObject doInHibernate )IUeWR
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(Session session)throws HibernateException { 9pAklD 4
Criteria criteria = &w\E*$
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detachedCriteria.getExecutableCriteria(session); 7hAFK
return g/H:`J
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criteria.setProjection(Projections.rowCount t(3<w)r2
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()).uniqueResult(); &h)G>Sqc
} ygt7;};!
}, true); vbT"}+^Sh
return count.intValue(); 72rnMHq
} J9s4lsea
} c_$9z>$
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用户在web层构造查询条件detachedCriteria,和可选的 +E.}k!y
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 #1-y[w/
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PaginationSupport的实例ps。 5I #L|+
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ps.getItems()得到已分页好的结果集 "4W@p'
ps.getIndexes()得到分页索引的数组 ]ZJu
ps.getTotalCount()得到总结果数 E]zTd$v6
ps.getStartIndex()当前分页索引 ;r(hZ%pD
ps.getNextIndex()下一页索引 {Rc!S? 8
ps.getPreviousIndex()上一页索引 Y@)iPK@z
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 5AmYrXZ
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 N}ur0 'J0
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一下代码重构了。 k-;%/:Om
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我把原本我的做法也提供出来供大家讨论吧: 4-P'e%S
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首先,为了实现分页查询,我封装了一个Page类: S*3N6*-l"
java代码: dz^l6<a"n
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/*Created on 2005-4-14*/ IyTL|W6
package org.flyware.util.page; om$x;L6
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/** 6=V&3|"
* @author Joa _N`:NOM
* ;6o p|O
*/ JffjGf-o
publicclass Page { JZ#O"rF
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/** imply if the page has previous page */ )vH6N _
privateboolean hasPrePage; 8KqrB!
@ 2r9JqR[=
/** imply if the page has next page */ b$/TfpNdo
privateboolean hasNextPage; bZ!*s
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/** the number of every page */ ;XFo:?
privateint everyPage; xO8-vmf2
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/** the total page number */ /P<K)a4GM
privateint totalPage; Jb'l.xN
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/** the number of current page */ ~T;FOB%w
privateint currentPage; sSVgDQ~q
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/** the begin index of the records by the current <uGc=Du
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query */ plL##?<D<
privateint beginIndex; RS&l68[6
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/** The default constructor */ Nh7Dz
public Page(){ \!HGkmd
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} x!CCSM;q
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/** construct the page by everyPage g~FA:R
* @param everyPage NABwtx>.
* */ YJZViic
public Page(int everyPage){ IY$H M3t7
this.everyPage = everyPage; ]IQTf5n
} zyNg?_SM
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/** The whole constructor */ n(-1vN
public Page(boolean hasPrePage, boolean hasNextPage, UEeD Nl$^u
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int everyPage, int totalPage,
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int currentPage, int beginIndex){ YXCfP~i
this.hasPrePage = hasPrePage; 2/.Euf
this.hasNextPage = hasNextPage; n6T@A;_g
this.everyPage = everyPage; iU^KmM I
this.totalPage = totalPage; DgOO\
this.currentPage = currentPage; h+o-h4X
this.beginIndex = beginIndex; H f}->
} DyiyH%SSD
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/** sdq8wn
* @return X) lz BM
* Returns the beginIndex. :BLD&mb"Y
*/
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publicint getBeginIndex(){ >5Vv6_CI0?
return beginIndex; H+&c=~D\_
} {(r`&[
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/** yyZV/
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* @param beginIndex $ZSjq
* The beginIndex to set. [[(29|`]
*/ T%kr&XsQX
publicvoid setBeginIndex(int beginIndex){ tuzw%=Ey
this.beginIndex = beginIndex; (UWV#AR
} !Yx9=>R
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/** E"p;
* @return 9&R. <I
* Returns the currentPage. m,i@
*/ >sW9n[
publicint getCurrentPage(){ 3ifQKKcR{
return currentPage; ?Rlo<f:Mf
} ;eYm+e^?.
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/** V gLnpPOQ
* @param currentPage 92|\`\LP%
* The currentPage to set. }G,PUjg_^3
*/ sJ{S(wpi"
publicvoid setCurrentPage(int currentPage){ <d".v
this.currentPage = currentPage; 3 ZO\Pu
} .t\#>Fe
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/** |E/r64T
* @return `w@8i[2J
* Returns the everyPage. &)4#0L4
*/ E! '|FJ
publicint getEveryPage(){ NRU&GCVwu
return everyPage; |tl4I2AV
} cE3g7(a
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/** 1n+C'P"
* @param everyPage
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* The everyPage to set. '1|FqQ\.
*/ +AGI)uQQ
publicvoid setEveryPage(int everyPage){ iT f]Pd'
this.everyPage = everyPage; S>AM?
} k+
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