Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 U`8^N.Snrp
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 9wYtOQ{g
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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 8KL_PwRX_f
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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 7gdU9c/q,
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。 &xiDG=I#
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分页支持类: #pm-nU%|_j
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java代码: !=h|&Vta
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package com.javaeye.common.util; l_j<aCY?|
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import java.util.List; VM V]TPks>
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publicclass PaginationSupport { M_e$l`"G
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publicfinalstaticint PAGESIZE = 30; u6S0t?Udap
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privateint pageSize = PAGESIZE; ==jw3_W
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privateList items; R{OE{8;
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privateint totalCount; jcv1z v.
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privateint[] indexes = newint[0]; v<J;S9u=
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privateint startIndex = 0; b]g&rwXYt
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public PaginationSupport(List items, int (HrkUkw
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totalCount){ i\Q"a B"r
setPageSize(PAGESIZE); E][{RTs
setTotalCount(totalCount); N>nvt.`P
setItems(items); |n6Q
setStartIndex(0); `d|bH;w
} &fd4IO/O
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public PaginationSupport(List items, int >eG&gc@$1$
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totalCount, int startIndex){ D>7_P7]y
setPageSize(PAGESIZE); l;Wy,?p
setTotalCount(totalCount); ,<P[CUD&&
setItems(items); *A1TDc$
setStartIndex(startIndex); }jY[| >z
} cVHE}0Xd(
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public PaginationSupport(List items, int EAd:`X,Y
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totalCount, int pageSize, int startIndex){ UK<DcM~n
setPageSize(pageSize); L5 k>;|SA
setTotalCount(totalCount); (8-lDoW
setItems(items); 0-~6}
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setStartIndex(startIndex); o?O,nD
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} ^B!?;\4IM
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publicList getItems(){ 5fx,rtY2sQ
return items; > v!c\
} BQ}.+T\
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publicvoid setItems(List items){ E#2k|TpH4
this.items = items; `w=H'"Zv
} dK;\`>8
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publicint getPageSize(){ ~!d)J
return pageSize; ,S0~:c:)
} Mm7n?kb6
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publicvoid setPageSize(int pageSize){ kdMS"iN8x
this.pageSize = pageSize; |o=\9:wV
} !>2\OSp!
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publicint getTotalCount(){ s^?sJUj
return totalCount; qD%&\ZT
} -b>O4_N
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publicvoid setTotalCount(int totalCount){ %FWfiFV|<
if(totalCount > 0){ (F
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this.totalCount = totalCount; 8~Hs3\Hp
int count = totalCount / 'kg]|"M
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pageSize; qddT9U|8~
if(totalCount % pageSize > 0) %V1T!<
count++; (:HbtrI
indexes = newint[count]; &aAo:pj
for(int i = 0; i < count; i++){ -%V-'X5
indexes = pageSize * U9fF;[g
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i; 7C?mD75j
} ODvpMt:+
}else{ U6'haPlOk%
this.totalCount = 0; No&[ \;
} ApJf4D<V
} xOyL2
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publicint[] getIndexes(){ Ww
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return indexes; E,"btBg
} MirBJL
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publicvoid setIndexes(int[] indexes){ |21hY
this.indexes = indexes; RowiSW
} g7LW?Ewr
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publicint getStartIndex(){ LP-Q'vb<=
return startIndex; z(X6%p0
} _%Ld
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publicvoid setStartIndex(int startIndex){ :aqskeT
if(totalCount <= 0) EM
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this.startIndex = 0; })SdaZ
elseif(startIndex >= totalCount) T_%]#M
this.startIndex = indexes !K~$-jlT
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[indexes.length - 1]; sfPN\^k2
elseif(startIndex < 0) Q!e0Vb
this.startIndex = 0; 49fq6ZhO
else{ |<
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this.startIndex = indexes "jc)N46
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[startIndex / pageSize]; `DllW{l
} ~tuFjj^
} Z:$b)+2:\
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publicint getNextIndex(){ `srZ#F5
int nextIndex = getStartIndex() + .);:K
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pageSize; dTQvz9 C
if(nextIndex >= totalCount) A":b_!sW
return getStartIndex(); >D4Ez
else eniR}
return nextIndex; AR6vc
} p}7&x[fTLk
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publicint getPreviousIndex(){ }F`2$Q+CW
int previousIndex = getStartIndex() - W*`6ero
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pageSize; &E`Z_}~
if(previousIndex < 0) ~WXxVm*@
return0; }V;]c~Q/H
else ^tcBxDC"]
return previousIndex; X )s7_
} *Y0,d`
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} NB+O;
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抽象业务类 )_K@ ?rWS
java代码: !QS<;)N@
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/** _N';`wjDY
* Created on 2005-7-12 6|cl`}g_j
*/ t3g!5
package com.javaeye.common.business; i4rF~'h@
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import java.io.Serializable; #e>MNc
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import java.util.List; dKpa5f7
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import org.hibernate.Criteria; a\_,_psK
import org.hibernate.HibernateException; F]#fl%
import org.hibernate.Session; @2*6+w_Ae
import org.hibernate.criterion.DetachedCriteria; tgA
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import org.hibernate.criterion.Projections; Pp hQa!F$
import S9oGf
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org.springframework.orm.hibernate3.HibernateCallback; S`w)b'B!M
import !PIdw~YC
<j3HT"^[D
org.springframework.orm.hibernate3.support.HibernateDaoS D07u?
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upport; y<d#sv(s
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import com.javaeye.common.util.PaginationSupport; hAyPaS #
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public abstract class AbstractManager extends Mu%,@?zM^/
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HibernateDaoSupport { dwMwd@*j
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privateboolean cacheQueries = false; mP[u[|]
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privateString queryCacheRegion; rNyK*Wjt
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publicvoid setCacheQueries(boolean U~t(YT
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cacheQueries){ ,m]q+7E
this.cacheQueries = cacheQueries; X-FHJ4
} #?6RoFgMe
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publicvoid setQueryCacheRegion(String Ntiz-qW
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queryCacheRegion){ g>zL{[e!
this.queryCacheRegion = >K%x44|
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queryCacheRegion; ]]3D`
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} -1JHhRr]
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publicvoid save(finalObject entity){ \]%U?`A
getHibernateTemplate().save(entity); +(%[f W
} 3:
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publicvoid persist(finalObject entity){ #KW:OFT
getHibernateTemplate().save(entity);
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} '7s!NF2
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publicvoid update(finalObject entity){ L ai"D[N
getHibernateTemplate().update(entity); Hp!F?J7sx
} P7-3Vf_L
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publicvoid delete(finalObject entity){ yk{al SF
getHibernateTemplate().delete(entity); C<>.*wlp=
} `f]O
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publicObject load(finalClass entity, %A3Jd4DH
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finalSerializable id){ ,qB081hPG
return getHibernateTemplate().load o:<3n,T
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(entity, id); 7<D_ h/WV
} 2wQ
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publicObject get(finalClass entity, 7l3q~ dQ
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finalSerializable id){ 7i.aZ2a%
return getHibernateTemplate().get @jKB!z9{
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(entity, id); B!@0(A
} pdSyx>rJ
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publicList findAll(finalClass entity){ ez{&Y>n
return getHibernateTemplate().find("from 6bba}P
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" + entity.getName()); UhK,H
} GWKefH
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publicList findByNamedQuery(finalString 51x,[y+Xe
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namedQuery){ qv\yQ&pj
return getHibernateTemplate v*3:8Y,
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().findByNamedQuery(namedQuery); 1CbC|q
} whCv9)x
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publicList findByNamedQuery(finalString query, ^iNR(cwgX
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finalObject parameter){ M &J*I
return getHibernateTemplate DxHeZQ"LL
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().findByNamedQuery(query, parameter); Gj=il-Po
} Ry C7
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publicList findByNamedQuery(finalString query, A7H=#L+C
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finalObject[] parameters){ OK=t)6&b
return getHibernateTemplate GF&"nW9A
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().findByNamedQuery(query, parameters); Wm 61
} s/V[tEC*z
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publicList find(finalString query){ fJuJ#MX{:
return getHibernateTemplate().find JFfx9%Fq
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(query); &3<]FK
} &!ZpBR(
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publicList find(finalString query, finalObject v;SJgZK
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parameter){ 2 E^P=jU`
return getHibernateTemplate().find lgl/|
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(query, parameter); d9s"y?8
} !SnpesTn
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public PaginationSupport findPageByCriteria bTj,5,8i
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(final DetachedCriteria detachedCriteria){ m`Z4#_s2
return findPageByCriteria 8Xr"4;}f+
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); v!2`hqO
} "2mVW_k
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public PaginationSupport findPageByCriteria f4q-wX_1
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(final DetachedCriteria detachedCriteria, finalint 3I]5DW %-
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startIndex){ H
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return findPageByCriteria g(1'i 1
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(detachedCriteria, PaginationSupport.PAGESIZE, ~1p
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startIndex); ; ?!sU
} xfb%bkr
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public PaginationSupport findPageByCriteria ~jgd92`{z
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(final DetachedCriteria detachedCriteria, finalint IcB>Hg5
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pageSize, q_!3<.sf
finalint startIndex){ <iMLM<J<w
return(PaginationSupport) .fgoEB,(
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getHibernateTemplate().execute(new HibernateCallback(){ ~/t#J
publicObject doInHibernate 6 `'^$wKs
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(Session session)throws HibernateException { =3FXU{"Qi4
Criteria criteria = <R2bz1!h.
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detachedCriteria.getExecutableCriteria(session); LTxOq|/Cq
int totalCount = d97wiE/i<
*fE5Z;!}
((Integer) criteria.setProjection(Projections.rowCount [*Lh4K
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()).uniqueResult()).intValue(); X]N8'Yt
criteria.setProjection x[]n\\a?
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(null); A/9 w r
List items = 7JbN WN
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criteria.setFirstResult(startIndex).setMaxResults O?P6rXKr
FK->|
(pageSize).list(); 74Lq!e3hMF
PaginationSupport ps = h-<+Pj c
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new PaginationSupport(items, totalCount, pageSize, )9}z^+TH
}RXm=ArN
startIndex); wDn5|F}i&
return ps; "F=O
} zDX-}t_'q
}, true); m$]?Jq
} ZW2U9
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public List findAllByCriteria(final (u *-(
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DetachedCriteria detachedCriteria){ /MA4Er r
return(List) getHibernateTemplate TtHqdKL
dD=dPi#
().execute(new HibernateCallback(){ q?`bu:yS
publicObject doInHibernate 0 ~VniF^
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(Session session)throws HibernateException { 0 j6/H?OT
Criteria criteria = "/K44(^
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detachedCriteria.getExecutableCriteria(session); nM@S`"
return criteria.list(); w9vqFtj
} [-Dx)N
}, true); $cc]pJy"}
} QHK$2xtq|
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public int getCountByCriteria(final B&cC;Hw
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DetachedCriteria detachedCriteria){ jfk`%CEk=
Integer count = (Integer) fF;-d2mF
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getHibernateTemplate().execute(new HibernateCallback(){ O0e6I&u:
publicObject doInHibernate SwLul4V
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(Session session)throws HibernateException {
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Criteria criteria = 4~D?F'o
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detachedCriteria.getExecutableCriteria(session); ^ [2A<
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return k5(@n>p
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criteria.setProjection(Projections.rowCount Po% V%~
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()).uniqueResult(); Or0=:?4`
}
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}, true); 9|fg\C
return count.intValue(); fs\l*nBig
} g$~ktr+%
} Nw8lg*t"
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用户在web层构造查询条件detachedCriteria,和可选的 USv: +
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 V |)3l7IC<
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PaginationSupport的实例ps。 ,F]Y,"x:
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ps.getItems()得到已分页好的结果集 #2s$dI
ps.getIndexes()得到分页索引的数组 K08xiMjl
ps.getTotalCount()得到总结果数 5$/ED3mcK
ps.getStartIndex()当前分页索引 ,,OO2EgZ`
ps.getNextIndex()下一页索引 xM'bb5
ps.getPreviousIndex()上一页索引 b 'jZ4{+W
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 2Gd.B/L6
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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 vWc =^tT
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一下代码重构了。 "8>T
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我把原本我的做法也提供出来供大家讨论吧: E0[ec6^qwY
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首先,为了实现分页查询,我封装了一个Page类: v'mRch)d
java代码: BagO0#
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/*Created on 2005-4-14*/ jhl9
package org.flyware.util.page; iv*`.9TK-
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/** @m[q0G}
* @author Joa Gm~jC <
* dI};l
*/ V.?N29CA|
publicclass Page { |uf{:U)
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/** imply if the page has previous page */ pUi|&F K">
privateboolean hasPrePage; $dIu${lu
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/** imply if the page has next page */ >+Z BQ]~
privateboolean hasNextPage; *:L-/Q)i
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/** the number of every page */ l];w,(u{
privateint everyPage; q$x$ 4
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/** the total page number */ %&w 8E[
privateint totalPage; [$:M/5y9
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b
/** the number of current page */ 7L)edR[
privateint currentPage; Oh)s"f\N
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/** the begin index of the records by the current <+o*"z\mI
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query */ _kGJqyYV
privateint beginIndex; }ya@*jH
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@
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/** The default constructor */ F<H[-k*t/
public Page(){ Av6=q=D
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} 0se0AcrW
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/** construct the page by everyPage {EU?{#
* @param everyPage ~xfoZiIA}
* */ B6 rz
public Page(int everyPage){ EC#4"bU`'2
this.everyPage = everyPage; ,6TF]6:
} mXAGa8##j
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/** The whole constructor */ YvA@I|..~
public Page(boolean hasPrePage, boolean hasNextPage, ]:H((rk
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int everyPage, int totalPage, ::?,ZA
int currentPage, int beginIndex){ I!LSDi3
this.hasPrePage = hasPrePage; [=/Yo1:v
this.hasNextPage = hasNextPage; 9NzK1V0X
this.everyPage = everyPage; ;6+e !h'1
this.totalPage = totalPage; =T7lv%u
this.currentPage = currentPage; Qg9*mlm`
this.beginIndex = beginIndex; $U. >]i
} }MU}-6
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/** QEtf-xNn^
* @return \<n 9kwU
* Returns the beginIndex. d}B_ wz'
*/ fyHFfPEE
publicint getBeginIndex(){ }enS'Fpf`
return beginIndex; R;yi58Be
} B8=r^!jEL
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/** ,EsPm'`?A/
* @param beginIndex b{+7sl
* The beginIndex to set. M( euwy
*/ HgVPyo
publicvoid setBeginIndex(int beginIndex){ 4DLp+6zP
this.beginIndex = beginIndex; ui>0?O*G
} (g(.gN]
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/** X1wlOE
* @return s<#["K*_
* Returns the currentPage. {Tr5M o
*/ ko7*9`
publicint getCurrentPage(){ [l`_2{:
return currentPage; $RASpM
} 3$ 'eDa[
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/** 8,VX%CS#q
* @param currentPage gC/~@Z8W]
* The currentPage to set. S2APqRg*
*/ [nYm-\M
publicvoid setCurrentPage(int currentPage){ 2D'b7zPJ3
this.currentPage = currentPage; /Ko{S_3<I
} Uj/m
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/** ='rSB.$Ctk
* @return 7A,QA5G]C
* Returns the everyPage. n8K FP
*/ S`w_q=-^8
publicint getEveryPage(){ h=a-~= 8
return everyPage; hwD;1n
} 6cQ)*,Q
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/** 7NQ@q--3s
* @param everyPage ]'"aVGqa.
* The everyPage to set. 5u:{lcC.X
*/ 4Y'Kjx
publicvoid setEveryPage(int everyPage){ /7`fg0A
this.everyPage = everyPage; K-<kp!v
} $T#yxx
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/** ezz;NH
* @return b'5]o
* Returns the hasNextPage. dRhsnT+KX
*/ 7>@g)%",
publicboolean getHasNextPage(){ H
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return hasNextPage; _x'?igy
} U@'F9UB`
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/** f+c<