Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 'p{N5eM
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 ?^<
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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 FYs-vW {
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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 rh6gB]X]3:
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分页支持类: ("7rjQjRz
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java代码: yi*2^??`
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package com.javaeye.common.util; "GTlJqhk
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import java.util.List; VT;Vm3\
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publicclass PaginationSupport { d\_$Nb*
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publicfinalstaticint PAGESIZE = 30; IgsK7wn
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privateint pageSize = PAGESIZE; mYy{G s7
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privateList items; r}1.=a
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privateint totalCount; 7l%]/`Y-
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privateint[] indexes = newint[0]; 1j9R^
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privateint startIndex = 0; Ob+Rnfx37
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public PaginationSupport(List items, int m!qbQMXn
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totalCount){ +p%!G1Yz
setPageSize(PAGESIZE); ;_HG
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setTotalCount(totalCount); J*n Q(*e
setItems(items); <yw6Om:n<
setStartIndex(0); j`'9;7h M6
} &RzkM4"
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public PaginationSupport(List items, int * 7<{Xbsj^
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totalCount, int startIndex){ /oWn0
setPageSize(PAGESIZE); .}wVM`81z
setTotalCount(totalCount); q,8TOn
setItems(items); oV(|51(f
setStartIndex(startIndex); bI_6';hq!
} )dv w.X
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public PaginationSupport(List items, int .;1tu+S
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totalCount, int pageSize, int startIndex){ =Ts3O0"[
setPageSize(pageSize); Hz*5ZIw
setTotalCount(totalCount); .9cQq/{b
setItems(items); eNwF<0}
setStartIndex(startIndex); ~6)A/]6
} x'4q`xDa
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publicList getItems(){ GV+K]
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return items; kgq"b)
} y.O%
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publicvoid setItems(List items){ \ r^#a
this.items = items; *[P"2b#
} z^ai *
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publicint getPageSize(){ >o]!-46
return pageSize; R 2{ kS
} 95wi~^^
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publicvoid setPageSize(int pageSize){ OzVCqq"]
this.pageSize = pageSize; O3YD
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} ?F^$4:
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publicint getTotalCount(){ <Va7XX%>
return totalCount; MsaD@JY.y
} z frEM
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publicvoid setTotalCount(int totalCount){ L[|($vQ"
if(totalCount > 0){ /#lqv)s'
this.totalCount = totalCount; !iys\ AV
int count = totalCount / r@O5{V
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pageSize; DFk0"+Ky
if(totalCount % pageSize > 0) m=qEQy6#2u
count++; ]#7{x
indexes = newint[count]; ag_RKlM3
for(int i = 0; i < count; i++){ k
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indexes = pageSize * [1LlzCAFBw
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} )V6Bzn}9
}else{ DV8b<)
this.totalCount = 0; Z7="on4
} \Nvu[P
} cbton<r~
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publicint[] getIndexes(){ !Lu noC>B
return indexes; +E7Os|m
} nT;Rwz$3
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publicvoid setIndexes(int[] indexes){ NMM$
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this.indexes = indexes; K&\
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} ,:E*Mw:
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publicint getStartIndex(){ NrVE[Z#
return startIndex; )'+
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} G2 E4
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publicvoid setStartIndex(int startIndex){ Wq+a5[3"
if(totalCount <= 0) wm'a)B?
this.startIndex = 0; m\0Xh*
elseif(startIndex >= totalCount) tbH`VD"u
this.startIndex = indexes zc`gm~@
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[indexes.length - 1]; #Ns]l<
elseif(startIndex < 0) ]UMt
this.startIndex = 0; 6H #4iMeh
else{ C'wRF90
this.startIndex = indexes Sb/`a~q^
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[startIndex / pageSize]; a7?)x])e
} ~fht [S?@M
} PX} ~
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publicint getNextIndex(){ _ddOsg|U
int nextIndex = getStartIndex() + a(eKb2 CX
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pageSize; -K@mjN
if(nextIndex >= totalCount) LwI A4$d
return getStartIndex(); O-=~Bn
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else C)a;zU;9
return nextIndex; OpNxd]"T
} DO^J=e
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publicint getPreviousIndex(){ eXYf"hU,
int previousIndex = getStartIndex() - TdCC,/c3
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pageSize; sU=7)*$
if(previousIndex < 0) ZHN@&Gg6)
return0; Zw`9B
else \se
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return previousIndex; #H5i$ o
} Fmd^9K
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} ?=dp]E{
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抽象业务类 V#P`FX
java代码: eVetG,["
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/** Qf
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* Created on 2005-7-12 ,O'#7Dj
*/ <NYf !bx
package com.javaeye.common.business; 0DB8[#i%:
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import java.io.Serializable; [Nw%fuB
import java.util.List; wyi%!H
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import org.hibernate.Criteria; i[#XYX'\
import org.hibernate.HibernateException; |b+ZKRW
import org.hibernate.Session; !!\x]$v
import org.hibernate.criterion.DetachedCriteria; }|j\QjH
import org.hibernate.criterion.Projections; _-R&A@
import JnY.]:
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org.springframework.orm.hibernate3.HibernateCallback; 6]^~yby P
import Pe,:FIp,
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org.springframework.orm.hibernate3.support.HibernateDaoS `:Bm@eN
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upport; SmUj8?6"
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import com.javaeye.common.util.PaginationSupport; $[xS>iuD
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public abstract class AbstractManager extends ng6".u9
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HibernateDaoSupport { iU/v;T(
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privateboolean cacheQueries = false; xW.~Jt
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privateString queryCacheRegion; .ED8b5t|
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publicvoid setCacheQueries(boolean hR+\,P#G[
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cacheQueries){ U^&,xz$Cg
this.cacheQueries = cacheQueries; NE)Yd7m-
} 5I6u 2k3
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publicvoid setQueryCacheRegion(String M?ObK#l!_
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queryCacheRegion){ ]/6i#fTw
this.queryCacheRegion = =MjkD)l
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queryCacheRegion; %nV6#pr
} }Sr=|j
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publicvoid save(finalObject entity){ @j`gxM_-O
getHibernateTemplate().save(entity); =3dR-3
} *w`_(Xf
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publicvoid persist(finalObject entity){ w\zNn4B})A
getHibernateTemplate().save(entity); *w
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} I
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publicvoid update(finalObject entity){ yBl9 a-2A
getHibernateTemplate().update(entity); |r+w(TG
} `Iqh\oY8-
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publicvoid delete(finalObject entity){ \#sdN#e;XA
getHibernateTemplate().delete(entity); bamQ]>0|>!
} PSHzB!
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publicObject load(finalClass entity, 3]li3B'
)qua0'y]@
finalSerializable id){ X#<+D1P
return getHibernateTemplate().load !!+LFe4su
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(entity, id); VD~
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} "8iIOeY-\
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publicObject get(finalClass entity, Gq]/6igzX
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finalSerializable id){ +.-g`Vyz*
return getHibernateTemplate().get -xVZm8y
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(entity, id); hYbaVE
} nt_FqUJ
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publicList findAll(finalClass entity){ 7DPxz'7):
return getHibernateTemplate().find("from ^O
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" + entity.getName()); adWH';Q:
} A=+1PgL66
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publicList findByNamedQuery(finalString Jbn^G7vH<6
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namedQuery){ *|as-!${k
return getHibernateTemplate 8/<+p? 3p>
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().findByNamedQuery(namedQuery); RqKkB8g
} &,tj.?NCn
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publicList findByNamedQuery(finalString query, Q%:Z&lgy
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finalObject parameter){ AfpC >>=@
return getHibernateTemplate NXMZTZpB7
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().findByNamedQuery(query, parameter); zSagsH |W
} 2 b80b50
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publicList findByNamedQuery(finalString query, AAF']z<4_"
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finalObject[] parameters){ ](^FGz
return getHibernateTemplate &S39SV
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().findByNamedQuery(query, parameters); Gc_KS'K@$
} uN=f(-"
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publicList find(finalString query){ .cz7jD
return getHibernateTemplate().find wUfm)Q#
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(query); x^Zm:Jrw~
} 48_( 'z*>
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publicList find(finalString query, finalObject x~ID[
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parameter){ <m,bP
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return getHibernateTemplate().find =\M6s
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(query, parameter); p_i',5H(
} =&^tfD
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public PaginationSupport findPageByCriteria +k V$ @qH
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(final DetachedCriteria detachedCriteria){ uFuP%f!yY
return findPageByCriteria !p Q*m`Xo
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); sJMpF8
} WidLUv
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public PaginationSupport findPageByCriteria j_.tg7X
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(final DetachedCriteria detachedCriteria, finalint CIVV"p`}
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@,-L
startIndex){ g"N&*V2
return findPageByCriteria P?@o?
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(detachedCriteria, PaginationSupport.PAGESIZE, Dis kGq@T
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startIndex); !AGoI7W}
} Q$Rp?o&
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public PaginationSupport findPageByCriteria p*l=rni4
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(final DetachedCriteria detachedCriteria, finalint iI3,q-LA
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pageSize, G[=;519
finalint startIndex){ tYG6Gl
return(PaginationSupport) >-y}t9[/
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getHibernateTemplate().execute(new HibernateCallback(){ \wR\i^
publicObject doInHibernate 7=s7dYlu
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(Session session)throws HibernateException { vGOO"r(xL
Criteria criteria = X<H{
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detachedCriteria.getExecutableCriteria(session); %~M#3Ywa
int totalCount = nd[Ja_h
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((Integer) criteria.setProjection(Projections.rowCount Wiyiq )^
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()).uniqueResult()).intValue(); Cq[Hh#q
criteria.setProjection pb G5y7
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(null); $W9dUR0
List items = Ya-GDB;L
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criteria.setFirstResult(startIndex).setMaxResults D~M*]&
^>^h|$
(pageSize).list(); "N)InPR-
PaginationSupport ps = -j@IDd7
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new PaginationSupport(items, totalCount, pageSize, 4O:HT m
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startIndex); m}f{o
return ps; pktnX-Slt
} N36B*9m&p
}, true); 79I"F'
} 6R*eJICN
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public List findAllByCriteria(final {R/e1-;
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DetachedCriteria detachedCriteria){ ,!X:wY}dW
return(List) getHibernateTemplate 8"A0@fNz
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().execute(new HibernateCallback(){ v^;vH$B
publicObject doInHibernate ..w$p-1
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(Session session)throws HibernateException { {1+meE
Criteria criteria = ":qS9vW
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detachedCriteria.getExecutableCriteria(session); 5bd4]1gj
return criteria.list(); -:~z,F
} FEX67A8/;
}, true); ;9q$eK%d
} /O`R9+;
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public int getCountByCriteria(final ,@I\'os
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DetachedCriteria detachedCriteria){ KFy|,@NI
Integer count = (Integer) PZ#aq~>w
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getHibernateTemplate().execute(new HibernateCallback(){ L0w2qF
publicObject doInHibernate na
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(Session session)throws HibernateException { er2;1TW3E
Criteria criteria = R^]a<g,
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detachedCriteria.getExecutableCriteria(session); K)}Vr8,V
return =h|7bYLy
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criteria.setProjection(Projections.rowCount Z_7TD)
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()).uniqueResult(); %NfH`%`
} 02)Ybp6y
}, true); vl?fCO
return count.intValue(); c8HETs1
} wUfPnAD.'
} h 0)oQrY
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用户在web层构造查询条件detachedCriteria,和可选的 y)TBg8Q
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 ,dFY]
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PaginationSupport的实例ps。 dj}P|v/;z
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ps.getItems()得到已分页好的结果集 `6LVXDR
ps.getIndexes()得到分页索引的数组 3$BO=hI/-
ps.getTotalCount()得到总结果数 NE3/>5
ps.getStartIndex()当前分页索引 '#~Sb8
ps.getNextIndex()下一页索引 z6h/C{
ps.getPreviousIndex()上一页索引 ]BTISaL-R
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 xsrdHP1
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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 :U]Pm:ivTU
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一下代码重构了。 E/D@;Ym18
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我把原本我的做法也提供出来供大家讨论吧: U.<a d
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首先,为了实现分页查询,我封装了一个Page类: 6\%#=GG
java代码: ZW
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/*Created on 2005-4-14*/ FY]Et=p
package org.flyware.util.page; 6+C]rEY/o
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/** 'lgS)m
* @author Joa W;U<,g
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* N'|9rB2e
*/ g%D.sc)69
publicclass Page { 0 4oMgH>Vd
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/** imply if the page has previous page */ LrV|Y~
privateboolean hasPrePage; "\M3||.!
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/** imply if the page has next page */ En0hjXa
privateboolean hasNextPage; ENf(E9O
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/** the number of every page */ Kn2W{* wD
privateint everyPage; _cJ\A0h^
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/** the total page number */ C.se/\PE
privateint totalPage; mk6>}z*
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/** the number of current page */ ~Q=^YZgn8
privateint currentPage; :K!L-*>A9
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/** the begin index of the records by the current j3>&Su>H4
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query */ R]o2_r7N"}
privateint beginIndex; q-e3;$
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/** The default constructor */ Owh:(EJ"d
public Page(){ 7}tXF
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} <V#]3$(S
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/** construct the page by everyPage @j%7tfW
* @param everyPage xI~ c~KC
* */ +.X3&|@k
public Page(int everyPage){ p,\(j
this.everyPage = everyPage; ;|oem\dKv
} ,LL=b-Es
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/** The whole constructor */ xB}B1H%
public Page(boolean hasPrePage, boolean hasNextPage, YH-W{].
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int everyPage, int totalPage, =DI/|^j{;
int currentPage, int beginIndex){ ;]2d%Qt
this.hasPrePage = hasPrePage; Nh6!h%
this.hasNextPage = hasNextPage; a3:1`c/~\
this.everyPage = everyPage; IN"6=2:
this.totalPage = totalPage; dAjm4F-
this.currentPage = currentPage; Q*/jQC
this.beginIndex = beginIndex; eW[](lGWM
} )U{IQE;T#
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/** Ystd[
* @return `V?NS,@$
* Returns the beginIndex. ")W5`9
*/ y"ms;w'z
publicint getBeginIndex(){ u/5)Yx+5_
return beginIndex; DF"*[]^[
} pAcu{5#7
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/** 1*B'o<?P1
* @param beginIndex .L_ Hk
* The beginIndex to set. $XFFNE`%
*/ p{w;y6e
publicvoid setBeginIndex(int beginIndex){ fc%C!^7
this.beginIndex = beginIndex; dewN\
} -nB.
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/** + )7h)uq
* @return L#/<y{
* Returns the currentPage. t;lK=m|
*/ 4n2*2
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publicint getCurrentPage(){ 44UN*_qG
return currentPage; n5?7iU&JIo
} ymA8`k5>@
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/** w#;y
* @param currentPage p1,.f&(f
* The currentPage to set. z-`4DlJUS
*/ 8|rlP
publicvoid setCurrentPage(int currentPage){ 7*47mJyc
this.currentPage = currentPage; }kk[lvhJ
} N!13QI
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/** l/bZE.GJ
* @return K )9f\1\
* Returns the everyPage. V_T~5%9Fy
*/ qWI8 >my11
publicint getEveryPage(){
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return everyPage; Aj@t*3
} Qf|c^B
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/** 6+yA4pRSd
* @param everyPage R%;dt<Dh
* The everyPage to set. Q% J!
*/ <GoZ>
publicvoid setEveryPage(int everyPage){ tnw6[U!rh=
this.everyPage = everyPage; CSMx]jbb
} [3(lk_t
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/** N1'$;9 c
* @return '6Yx03t
* Returns the hasNextPage. us^J!
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*/ c nV2}U/\
publicboolean getHasNextPage(){ '_o(I
return hasNextPage; <#7j~ <
} Br"K{g?
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/** ]U3@V#*
* @param hasNextPage A,%NdM;t=5
* The hasNextPage to set. J|dj`Z?
*/ @86I|cY
publicvoid setHasNextPage(boolean hasNextPage){ H`8}w{ft&
this.hasNextPage = hasNextPage; rh6m
} Ert`
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/** W/<