Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 sNB*S{
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 dpAj9CX(
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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 1i=lJmr
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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 t&|M@Ouet
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分页支持类: ,~8&0p
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java代码: qZQB"Q.*
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package com.javaeye.common.util; gn82_
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import java.util.List; zXX=WH
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publicclass PaginationSupport { #/N;ScyUJT
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publicfinalstaticint PAGESIZE = 30; !s^[|2D_U
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privateint pageSize = PAGESIZE; PFR64HK2
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privateList items; Dh+<|6mx
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privateint totalCount; vciO={M
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privateint[] indexes = newint[0]; 0G;
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privateint startIndex = 0; B1^9mV'O
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public PaginationSupport(List items, int >o/+z18x
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totalCount){ ]mzghH:E
setPageSize(PAGESIZE); Mo'6<"x
setTotalCount(totalCount); M{GT$Q
setItems(items); ]g] ]\hS
setStartIndex(0); }BYs.$7
} . E8Gj'yO
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public PaginationSupport(List items, int Mi^/`1
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totalCount, int startIndex){ +HDfEo T
setPageSize(PAGESIZE); $I0&I[_LzK
setTotalCount(totalCount);
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setItems(items); w;b;rHAZ\
setStartIndex(startIndex); c`Q#4e]%_
} /Fj*sS8
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public PaginationSupport(List items, int ,gO(zI-1
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totalCount, int pageSize, int startIndex){ ew+>?a'&L
setPageSize(pageSize); !8Y$}
setTotalCount(totalCount); V$Zl]f$S
setItems(items); X_HU?Q_N
setStartIndex(startIndex); :DG7Z
} f|+aa6hN
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publicList getItems(){ 1[]
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return items; }'`iJb\
} Mg~62u
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publicvoid setItems(List items){ u> @@
this.items = items; ~'#yH#o
} M
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publicint getPageSize(){ rtxG-a56Q
return pageSize; \yhj {QS.k
} 9Zj9e
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publicvoid setPageSize(int pageSize){ % <1&\5f<5
this.pageSize = pageSize; g0-~%A,
} a7U`/*
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publicint getTotalCount(){ d_1uv_P
return totalCount; GIM'H;XG
} IkP; i_|
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publicvoid setTotalCount(int totalCount){ dbG902dR
if(totalCount > 0){ RW`+F|UbE
this.totalCount = totalCount; T9NTL\;
int count = totalCount / IY,n7x0d
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pageSize; GR,gCtG+L
if(totalCount % pageSize > 0) jn]:*i;i
count++; 7Z<
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indexes = newint[count]; 2n3!pZ8
for(int i = 0; i < count; i++){ s}lp^Uh=
indexes = pageSize * +.J/7gD
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} U|~IJU3-
}else{ !g[UFw
this.totalCount = 0; rM0Idc.$&&
} nV/;yl4e{
} SG@E*yT1
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publicint[] getIndexes(){ 8&wN9tPYZ
return indexes; BHf7\+Ul
} XK{K FB-
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publicvoid setIndexes(int[] indexes){ Z,I0<ecaD
this.indexes = indexes; bLSUF`-z
} {k uC+~R
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publicint getStartIndex(){ y=&^=Zh[
return startIndex; ne|N!!Dmk
} \Lg{GN.
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publicvoid setStartIndex(int startIndex){ \C kb:
if(totalCount <= 0) 8}Cp(z2
this.startIndex = 0; AhU
elseif(startIndex >= totalCount) CHckmCgf4
this.startIndex = indexes "IJ 9vXI
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[indexes.length - 1]; UO(?EELm
elseif(startIndex < 0) SnVb D<
this.startIndex = 0; ~o27~R ]
else{ VXO.S)v2J
this.startIndex = indexes ]sDlZJX<M
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[startIndex / pageSize]; y_M,p?]^,
} P?|>,
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} ,uL}O]L
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publicint getNextIndex(){ =`g@6S
int nextIndex = getStartIndex() + x"~gulcz
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pageSize; ]--"
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if(nextIndex >= totalCount) TFO4jjiC"
return getStartIndex(); !i8'gq'q
else <O3,b:vw
return nextIndex; hQ}y(2A.XI
} TG6E^3a P
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publicint getPreviousIndex(){ RG6U~o1
int previousIndex = getStartIndex() - ,.i)(Or
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pageSize; ] p*Fq^
if(previousIndex < 0) /DX6Hkkj %
return0; "b[w%KYyl
else F.iJz4ya_
return previousIndex; nEgYypwr
} 4Un%p7Y~
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} 15_Px9
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抽象业务类 [orS-H7^
java代码: fzr0dcNgM
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/** Su]p6B
* Created on 2005-7-12 |W*i'E
*/ xeW}`i5_w
package com.javaeye.common.business; evlz R/
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import java.io.Serializable; c^7QiTt_
import java.util.List; ]5+<Rqdbg
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import org.hibernate.Criteria; pwmH(94$0
import org.hibernate.HibernateException; -Q"
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import org.hibernate.Session; i\C~]K~O!
import org.hibernate.criterion.DetachedCriteria; =2/[n8pSsM
import org.hibernate.criterion.Projections; .9!?vz]1
import ?@H/;hB[|
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org.springframework.orm.hibernate3.HibernateCallback; z+]YB5zK%
import LfX[(FP
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org.springframework.orm.hibernate3.support.HibernateDaoS yZY.B
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upport; F!cRx%R
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import com.javaeye.common.util.PaginationSupport; PDhoCAh
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public abstract class AbstractManager extends *eAzk2
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HibernateDaoSupport { B8NMo5a
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privateboolean cacheQueries = false; c}mWAZ=wF
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privateString queryCacheRegion; h[oI/X
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publicvoid setCacheQueries(boolean A;7At!kK
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cacheQueries){ Bn5$TiTcl
this.cacheQueries = cacheQueries; L~HL*~#d
} a1gaB:w5n
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publicvoid setQueryCacheRegion(String
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queryCacheRegion){ lH"4"r
this.queryCacheRegion = V]P%@<C
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queryCacheRegion; 1(jDBP!8
} c63yJqiW
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publicvoid save(finalObject entity){ (}MN16!
getHibernateTemplate().save(entity); ?K=
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} -P-&]F5
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publicvoid persist(finalObject entity){ ,m1F<Pdts
getHibernateTemplate().save(entity); 6HRr4NDcj
} u9D#5NvGs
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publicvoid update(finalObject entity){ L[O.]2
getHibernateTemplate().update(entity); |%12Vr]J
} A3Oe=rB
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publicvoid delete(finalObject entity){ ~JG\b?s
getHibernateTemplate().delete(entity); >%c7|\q[ R
} >M^4p
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publicObject load(finalClass entity, L(DDyA{bA
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finalSerializable id){ |6GDIoZ
return getHibernateTemplate().load ~'#,*kA:6
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(entity, id); -p[!CI
} Jq_AR!} %
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publicObject get(finalClass entity, D\k'Eez
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finalSerializable id){ r"&VG2c0K
return getHibernateTemplate().get % jSB9
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(entity, id); DgODTxiX
} N~+ e\K6
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publicList findAll(finalClass entity){ w=QW8q?
return getHibernateTemplate().find("from KYR64[1
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" + entity.getName()); `w EAU7m:
} Z Z9D6+R
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publicList findByNamedQuery(finalString 1i/&t[
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namedQuery){ GDY=^r
return getHibernateTemplate @k3xk1*
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().findByNamedQuery(namedQuery); PAS0 D
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} u_jhmKr~
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publicList findByNamedQuery(finalString query, dT'd C
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finalObject parameter){ Z!2%{HQ=q
return getHibernateTemplate H&!?c5
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().findByNamedQuery(query, parameter); ZiaHLpk
} m*~Iu<5L
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publicList findByNamedQuery(finalString query, ]? %*3I
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finalObject[] parameters){
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return getHibernateTemplate _:~I(c6
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().findByNamedQuery(query, parameters); E~`l/ W
} 8C8,Q\WV(~
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publicList find(finalString query){ )<[)7`
return getHibernateTemplate().find 36UUt!}p
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(query); T,/:5L9
} =:_DXGW2H
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publicList find(finalString query, finalObject ^0HgE;4
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parameter){ 2 `U+
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return getHibernateTemplate().find "wnN
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(query, parameter); 'nN'bVl/
} D.*o^{w|
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public PaginationSupport findPageByCriteria 74fE%;F
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(final DetachedCriteria detachedCriteria){ SaFNPnk=
return findPageByCriteria 9i+.iuE%Bu
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); |syvtS{
} xTf|u
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public PaginationSupport findPageByCriteria JS^!XB'!
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(final DetachedCriteria detachedCriteria, finalint fVz0H1\J&
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startIndex){ %<{1N|
return findPageByCriteria +*Zjo&pc
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(detachedCriteria, PaginationSupport.PAGESIZE, ne
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startIndex); kK/([!
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public PaginationSupport findPageByCriteria azz=,^U#
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(final DetachedCriteria detachedCriteria, finalint apOXcZ
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pageSize, &(7=NAQsE
finalint startIndex){ dI%?uk
return(PaginationSupport) 1rx,qfCq
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getHibernateTemplate().execute(new HibernateCallback(){ xi51,y+(5
publicObject doInHibernate y'aK92pF:
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(Session session)throws HibernateException { WNY:HH
Criteria criteria = NnH]c+
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detachedCriteria.getExecutableCriteria(session); >?Duz+W)
int totalCount = 6ao~f?JZ
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((Integer) criteria.setProjection(Projections.rowCount xa.tH)R
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()).uniqueResult()).intValue(); lD^c_b
criteria.setProjection 0G31Kou
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(null); V/3@iOwD
List items = 7u{V1_n1
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criteria.setFirstResult(startIndex).setMaxResults 2E8G5?qe)
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(pageSize).list(); @R-11wP)M
PaginationSupport ps = T>f6V 5
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new PaginationSupport(items, totalCount, pageSize, b'``0OB )
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startIndex); 7Db}bDU1
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return ps; Jd^Lnp6?
} FDFwx|
}, true); <UF0Xc&X'
} "OwK-
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public List findAllByCriteria(final [^Bjmw[7
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DetachedCriteria detachedCriteria){ O\CnKNk,
return(List) getHibernateTemplate gu6%$z
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().execute(new HibernateCallback(){ 9: .m]QN
publicObject doInHibernate ,z<1:st]<
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(Session session)throws HibernateException { 3&>0'h
Criteria criteria = wVqp')e
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detachedCriteria.getExecutableCriteria(session);
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return criteria.list(); _RzFh
} (H5#r2h%Y
}, true); ,{mv6?_
} m}u)C&2>
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public int getCountByCriteria(final _1Q6FI5iR
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DetachedCriteria detachedCriteria){ F^$;hMh%
Integer count = (Integer) n$N$OFuO
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getHibernateTemplate().execute(new HibernateCallback(){ }K8e(i6z
publicObject doInHibernate LPBa!fq
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(Session session)throws HibernateException { tAE(`ow/Ur
Criteria criteria = 5JhvYsf3_
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detachedCriteria.getExecutableCriteria(session); x!fG%o~h
return QyxUK}6mr
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criteria.setProjection(Projections.rowCount *L9v(Kc
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()).uniqueResult(); >{QO$F#
} aW*k,\:e
}, true); 5[g\.yi2_]
return count.intValue(); ' Ut4=@)
} )
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} }NoP(&ebz*
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用户在web层构造查询条件detachedCriteria,和可选的 E_En"r)y
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 70GBf"
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PaginationSupport的实例ps。 8 eK 8-R$
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ps.getItems()得到已分页好的结果集 2mnAL#
ps.getIndexes()得到分页索引的数组 ^P^%Q)QXl
ps.getTotalCount()得到总结果数 e*qGrg (E
ps.getStartIndex()当前分页索引 E(j#R"
ps.getNextIndex()下一页索引 P
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ps.getPreviousIndex()上一页索引 *<W8j[?
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 IC&P-X_aP
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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 chKK9SC+|
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一下代码重构了。 !}z'"l4i
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我把原本我的做法也提供出来供大家讨论吧: ?T2>juf]5~
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首先,为了实现分页查询,我封装了一个Page类: o^vX\a?`u
java代码: l@Vv%w9H
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/*Created on 2005-4-14*/ HK8sn1j
package org.flyware.util.page; gr SF}y!3
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/** J _;H
* @author Joa .Zczya
* RC/ 3\'
*/ 4_kN';a4Q
publicclass Page { tLWw<)t
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/** imply if the page has previous page */ R
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privateboolean hasPrePage; ];LFv5"
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/** imply if the page has next page */ /@k#tdj
privateboolean hasNextPage; M&j|5UH%.
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/** the number of every page */ az6&
privateint everyPage; Zt!A!Afu
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/** the total page number */ 7Hr_ZwO/^
privateint totalPage; h9)fXW
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/** the number of current page */ m+hI3@j
privateint currentPage; k?14'X*7yu
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/** the begin index of the records by the current RyJy%|\-S
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query */ 3$nK
privateint beginIndex; ^obuMQ;
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/** The default constructor */ din,yHu~
public Page(){ ?b,>+v-w::
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} ::oFL#+
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/** construct the page by everyPage J+`aj8_ B
* @param everyPage VTu#)I7A^@
* */ ;Zd_2CZ
public Page(int everyPage){ N
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this.everyPage = everyPage; W5
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} "Gp[.=.z?
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/** The whole constructor */ HE,L8S
public Page(boolean hasPrePage, boolean hasNextPage, K:a8}w>Up
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2K91E}
int everyPage, int totalPage, #[#evlr=
int currentPage, int beginIndex){ jW\:+Taq
this.hasPrePage = hasPrePage; ;7lON-@BI
this.hasNextPage = hasNextPage; 6P1s*u
this.everyPage = everyPage; 2'Dl$DH
this.totalPage = totalPage; HrBJi
this.currentPage = currentPage; a/j;1xcc<
this.beginIndex = beginIndex; F3}MM
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} ^)Hf%
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/** R@\}iyM
* @return }`B
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* Returns the beginIndex. _]`7et\=
*/ [s>3xWZ+a
publicint getBeginIndex(){ fY!?rZ)$
return beginIndex; X_TjJmc
} 0SIC=p=J
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/** dH^6K0J
* @param beginIndex by@KdQow
* The beginIndex to set. ST*h{:u&A
*/ );gY8UL^
publicvoid setBeginIndex(int beginIndex){ }csA|cC
this.beginIndex = beginIndex; W[8Kia-OD
} /|
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