Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 {xD\w^
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 8|L U=p`y'
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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 !.G knDT
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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 3jqV/w[-
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分页支持类: }PXtwp13&u
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java代码: Ia[4P8Z
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package com.javaeye.common.util; p
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import java.util.List; d[\$a4G+
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publicclass PaginationSupport { |2Y/l~
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publicfinalstaticint PAGESIZE = 30; 4wkmgS
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privateint pageSize = PAGESIZE; !X5LgMw^ ;
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privateList items; u}">b+{!
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privateint totalCount; 4Uk\h gT0
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privateint[] indexes = newint[0]; e#AmtheZR
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privateint startIndex = 0; R0#'t+7^
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public PaginationSupport(List items, int J'E?Z0
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totalCount){ o
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setPageSize(PAGESIZE); ri2`M\;gt
setTotalCount(totalCount); +gyGA/5:d$
setItems(items); M9QYYo@
setStartIndex(0); to{7B7t>q
} #Q1
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public PaginationSupport(List items, int 9'=ZxV
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totalCount, int startIndex){ Q-?6o
setPageSize(PAGESIZE); :'4",
setTotalCount(totalCount); >qU5 (M_&L
setItems(items); Y<t(m$s
setStartIndex(startIndex); VBtdx`9
} =3Ohy,5L
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public PaginationSupport(List items, int O9*l6^Scw
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totalCount, int pageSize, int startIndex){ =p[a Cb
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setPageSize(pageSize); ".{'h
setTotalCount(totalCount); z.~jqxA9
setItems(items); (j-_iOQ]i+
setStartIndex(startIndex); '-BD.^!!
} Eq=j+ch7
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publicList getItems(){ 48,uO!
return items; 3ESrd"W=
} /?1^&a
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publicvoid setItems(List items){ ]m :Y|,:6
this.items = items; xnDst9%
} 6@;sOiN+
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publicint getPageSize(){ uE}$ZBiq
return pageSize; cR=o!2O
} tZY6{,K%4
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publicvoid setPageSize(int pageSize){ C^fn[plL
this.pageSize = pageSize; d[YG&.}+8j
} RB9ZaL\
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publicint getTotalCount(){ 61}eB/;7
return totalCount; tpa<)\7KJ
} 2v<O}
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publicvoid setTotalCount(int totalCount){ 7$v_#ZE.H
if(totalCount > 0){ 6lL^/$]
this.totalCount = totalCount; Js&.p9S2
int count = totalCount / `<6FCn4{X
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pageSize; *mkVk7]c
if(totalCount % pageSize > 0) ><qA+/4]_
count++; m7u" awM^
indexes = newint[count]; 4N5\sdi
for(int i = 0; i < count; i++){ /@1pm/>ZaN
indexes = pageSize * Fd#Zu.Np
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i; P9x':I$
}
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}else{ {mB!mbr
this.totalCount = 0; 3:>hHQi
} M }$Td_g
} vwzElZ{C:v
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publicint[] getIndexes(){ lHFk~Qp[
return indexes; y@<&A~Cl^
} V}ls|B$Y
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publicvoid setIndexes(int[] indexes){ }nptmc
this.indexes = indexes; pjma<^|F
} [@2$W?0i
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publicint getStartIndex(){ m%b#B>J,n
return startIndex; $WO{!R
} fVJWW):
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publicvoid setStartIndex(int startIndex){ rN,T}M=2
if(totalCount <= 0) L^=G(op*
this.startIndex = 0; <`u_O!h
elseif(startIndex >= totalCount) i]Bu7Fuu
this.startIndex = indexes -@XOe&q
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[indexes.length - 1]; RIDl4c
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elseif(startIndex < 0) Z FX6iAxd
this.startIndex = 0; e>P>DmlW
else{ *-S?bv,T'
this.startIndex = indexes TkVqv v
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[startIndex / pageSize]; e@1A_q@.
} j_h0hm]
} MpTOC&NG%s
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publicint getNextIndex(){ Z)f?X
int nextIndex = getStartIndex() + {&a6<y#-
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pageSize; bwa*|{R
if(nextIndex >= totalCount) >uDC!0)R
return getStartIndex(); bq9/d4
else )iJv?Y\]
return nextIndex; xz~Y
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} <`?%Cz AO
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publicint getPreviousIndex(){ +.g j/uy*
int previousIndex = getStartIndex() - DG}s`'
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pageSize; w&e3#p
if(previousIndex < 0) wB:<ICm
return0; nX\mCO4T
else l&5Tft
return previousIndex; FF;Fo}no-
} '<>?gE0Cd
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} ~[f`oC
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抽象业务类 j<R&?*
java代码: >WLHw!I!6
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/** C;%dZ
* Created on 2005-7-12 S~R[*Gk_uT
*/ 7-0j8$`
package com.javaeye.common.business; ;%k C?Vzi
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import java.io.Serializable; ~z,qr09
import java.util.List; <AK9HPxP
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import org.hibernate.Criteria; i5|)|x3
import org.hibernate.HibernateException; :i|]iXEI"
import org.hibernate.Session; O<ybiPR
import org.hibernate.criterion.DetachedCriteria; }
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import org.hibernate.criterion.Projections; c^&4m[?C[u
import 4dm0:,
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org.springframework.orm.hibernate3.HibernateCallback; #hk5z;J5
import Q3Y(K\
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org.springframework.orm.hibernate3.support.HibernateDaoS m/;fY>}3
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upport; ;rNX
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import com.javaeye.common.util.PaginationSupport; qJ .XI
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public abstract class AbstractManager extends 5"(FilM
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HibernateDaoSupport { Q#*R({)GH
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privateboolean cacheQueries = false; RS#C4NG
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privateString queryCacheRegion; c]i;0j? Dl
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publicvoid setCacheQueries(boolean 1f'msy/
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cacheQueries){ &C)97E
this.cacheQueries = cacheQueries; gGN6Yqj0
} bAy\Sr
#/
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publicvoid setQueryCacheRegion(String mD|Q+~=|e
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queryCacheRegion){ i29a1nD4Hm
this.queryCacheRegion = 9p1@Lfbj
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queryCacheRegion; \;!7IIe#
} TQPrOs?
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publicvoid save(finalObject entity){ ~N7;.
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getHibernateTemplate().save(entity); AX{7].)F
} 4#:C t* f
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publicvoid persist(finalObject entity){ ;),,Hk
getHibernateTemplate().save(entity); |68u4z K
} z@ `u$D$n
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publicvoid update(finalObject entity){ ZE=
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getHibernateTemplate().update(entity); P,(_y8
} g++-v HD
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publicvoid delete(finalObject entity){ (_6JQn
getHibernateTemplate().delete(entity); #k[Y(_
} RKM5FXX
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publicObject load(finalClass entity, a5/Dz&>j6
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finalSerializable id){ >>"@0tO
return getHibernateTemplate().load L"NfOST3'R
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(entity, id); lR9uD9Dr
} gv D*^
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publicObject get(finalClass entity, FvO,* r9
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finalSerializable id){ u^#e7u
return getHibernateTemplate().get ZHlHnUo
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(entity, id); d @ l
} p L^3*B.Nr
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publicList findAll(finalClass entity){ n)z:C{
return getHibernateTemplate().find("from uBn35%
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" + entity.getName()); t* p%!xsH
} /Ahh6=qQY
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publicList findByNamedQuery(finalString ledr[)
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namedQuery){ rvK%m_r
return getHibernateTemplate 8j :=D!S
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().findByNamedQuery(namedQuery); #!%zf{(C+
} Oamz>Hplu
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publicList findByNamedQuery(finalString query, ]ms+Va_/
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finalObject parameter){ L6;'V5Mg72
return getHibernateTemplate Ta/u&t4
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().findByNamedQuery(query, parameter); pU[yr'D.r
} {`T^&bk
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publicList findByNamedQuery(finalString query, F%af05L[
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finalObject[] parameters){ Q#.E-\=^
return getHibernateTemplate jA[")RVG
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().findByNamedQuery(query, parameters); N8x.D-=gG
} WwWCNN~}
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publicList find(finalString query){ O6ugN-d>
return getHibernateTemplate().find M%W#0
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(query); }$r]\v
} };EB[n
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publicList find(finalString query, finalObject 0PsQ
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parameter){ jUgx
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return getHibernateTemplate().find A wk1d
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(query, parameter); $|TLt{ K
} g W9`k,U
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public PaginationSupport findPageByCriteria rKd|s7l
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(final DetachedCriteria detachedCriteria){ bNiJ"k<pN
return findPageByCriteria *!{&n*N
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); bZK^q B
} pjFj{
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public PaginationSupport findPageByCriteria ;Ru[^p.{
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(final DetachedCriteria detachedCriteria, finalint \Sv|yQUT
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startIndex){ Z,81L3#6
return findPageByCriteria :XPat93w
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(detachedCriteria, PaginationSupport.PAGESIZE, /=A@O !l
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startIndex);
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} fX6pW%Q'6
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public PaginationSupport findPageByCriteria G ;ZN>8NB
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(final DetachedCriteria detachedCriteria, finalint }[MkJ21!
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pageSize, ^N
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finalint startIndex){ g)D@4RM
return(PaginationSupport) [z+YXs!N
: yq2
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getHibernateTemplate().execute(new HibernateCallback(){ 6E:H
publicObject doInHibernate /C5py-I
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(Session session)throws HibernateException { ;l `Ufx
Criteria criteria = @
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detachedCriteria.getExecutableCriteria(session); 'zT7$ .L
int totalCount = 8Q{9AoQ3'
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((Integer) criteria.setProjection(Projections.rowCount U5@B7v1
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()).uniqueResult()).intValue(); T4gfQ6#
criteria.setProjection RL/7>YQ
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(null); F MYcZ+4
List items = =MD)F
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criteria.setFirstResult(startIndex).setMaxResults Yl?s^]SFU
:,j^ei
(pageSize).list(); cfg.&P>
PaginationSupport ps = BM)a,fIgo
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new PaginationSupport(items, totalCount, pageSize, 8x7TK2r
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startIndex); \F\7*=xk
return ps; D!Nc&|X^
} .h4Z\R`
}, true); -eS r
} g2'K3e?.%
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public List findAllByCriteria(final O:RN4/17
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DetachedCriteria detachedCriteria){ W[]|Uu/%
return(List) getHibernateTemplate ,HmGp
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().execute(new HibernateCallback(){ 3DB= Xh
publicObject doInHibernate )hoVB
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(Session session)throws HibernateException { {_$['D^ az
Criteria criteria = yfR0vp<&
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detachedCriteria.getExecutableCriteria(session); XpK
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return criteria.list(); es.Y
} ) .' + {
}, true); *8yC6|wL?
} YN:Sn\`D 8
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public int getCountByCriteria(final P6ka'!z
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DetachedCriteria detachedCriteria){ o8%o68py
Integer count = (Integer) MTgf.
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getHibernateTemplate().execute(new HibernateCallback(){ US-f<Wq
publicObject doInHibernate .'2I9P\!
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(Session session)throws HibernateException { 2e3AmR@*
Criteria criteria = -ik((qx_
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detachedCriteria.getExecutableCriteria(session); f(!cz,y^\*
return xCT2FvX6
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criteria.setProjection(Projections.rowCount ",,.xLI7
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()).uniqueResult(); `022gHYv
} _,UYbD\[J}
}, true); +ek6}f#
return count.intValue(); [)I
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} (I>S qM
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} cd=H4:<T5
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用户在web层构造查询条件detachedCriteria,和可选的 vMn$lT@
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 wq1s#ag<
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PaginationSupport的实例ps。 5bI4'
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ps.getItems()得到已分页好的结果集 7*Zm{r@u
ps.getIndexes()得到分页索引的数组 ,lFzL3'_0x
ps.getTotalCount()得到总结果数 v{*2F
ps.getStartIndex()当前分页索引 |Dq?<Ha
ps.getNextIndex()下一页索引 Ju;^^
ps.getPreviousIndex()上一页索引 ]_|%!/_
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 JPj/+f
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,尤其是上面的示例代码,让我着实觉得该对我原来的分页查询做 vQ$"|8,
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一下代码重构了。 =i7CF3
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我把原本我的做法也提供出来供大家讨论吧: Nr]guC? rE
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首先,为了实现分页查询,我封装了一个Page类: zqI|VH
java代码: pXh`o20I
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/*Created on 2005-4-14*/ [<f9EeziB
package org.flyware.util.page; Zx6h%l,%
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/** H{EZ} *{M4
* @author Joa #Wb4*
* .6bo
*/ 0 EA3>$;
publicclass Page { v"Ryg]^_
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/** imply if the page has previous page */ la$%%@0/
privateboolean hasPrePage; Bw[IW[(~!
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/** imply if the page has next page */ XZ(<Mo\v
privateboolean hasNextPage; jr-9KxE
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/** the number of every page */ ']OT7)_
privateint everyPage; mfDt_Iq
*Id[6Z
/** the total page number */ RgM=g8}M
privateint totalPage; @|'9nPern
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/** the number of current page */ Sb)}
privateint currentPage; 5pHv5e
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/** the begin index of the records by the current "#f5jH
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query */ b 1."mT!p
privateint beginIndex; G2|G}#E
, BZ(-M
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/** The default constructor */ 2:yXeSeA
public Page(){ X1V~.kvt)
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} a785xSUV
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/** construct the page by everyPage I:MrX
* @param everyPage Un5 AStG
* */ AkO-PL
public Page(int everyPage){ a,fcR<
this.everyPage = everyPage; C!^;%VQ}d
} 8#1o
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/** The whole constructor */ AB<bW3qf(
public Page(boolean hasPrePage, boolean hasNextPage, N\CHIsVm>
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int everyPage, int totalPage, y4&x`|tv
int currentPage, int beginIndex){ m-cw5lW
this.hasPrePage = hasPrePage; t[G7&ovj
this.hasNextPage = hasNextPage;
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this.everyPage = everyPage; :)+)L@By
this.totalPage = totalPage; M}=fdH
this.currentPage = currentPage; z>
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this.beginIndex = beginIndex; 2Z`Jr/
}
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/** 4>Nig.#
* @return : 'pK
* Returns the beginIndex. W(.svJUgb.
*/ /}CAd
publicint getBeginIndex(){ *ck'vV'@
return beginIndex; XuU>.T$] c
} xa{.hp?
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/** J10&iCr{r*
* @param beginIndex iqsR]mab
* The beginIndex to set. W3R43>$
*/ nwDGzC~y<
publicvoid setBeginIndex(int beginIndex){ $)=`Iai
this.beginIndex = beginIndex; AD6 b
} H87k1^}HV
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/** 9'ky2
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* @return C9>^!?>
* Returns the currentPage. -Gm}i8;
*/ f67pvyy -
publicint getCurrentPage(){ %PK(Z*>
return currentPage; J DOs.w
} =~21.p
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/** <LX-},?P
* @param currentPage d%p{l)Hd
* The currentPage to set. Y"m}=\4{
*/ dw| VH1fS
publicvoid setCurrentPage(int currentPage){ 98UI]? 4
this.currentPage = currentPage; +NOq>kH@
} 4:kDBV;v
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/** koj*3@\p/
* @return gf/<sH2}
* Returns the everyPage. fA ),^
*/ zIU6bMMT3u
publicint getEveryPage(){ #X?E#^6?E
return everyPage; Jl$
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} z07:E>D]
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/** e_1L J
* @param everyPage xi)M8\K
* The everyPage to set. 1XHE:0!dQ
*/ @ xTVX'$
publicvoid setEveryPage(int everyPage){ wV4MP1c$
this.everyPage = everyPage; Nfmr5MU_
} TEC#owz
vJb/.)gh]
/** j`MK\*qmz
* @return [Z!oVSCZD%
* Returns the hasNextPage. h6;zAM}
*/ W"tGCnd
publicboolean getHasNextPage(){ #smfOGSd
return hasNextPage; 58o&Dv6?
} U.N&~S
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/** # `@jVX0
* @param hasNextPage +.xK`_[M
* The hasNextPage to set. !0v3Lu~j
*/ 2=naPTP(
publicvoid setHasNextPage(boolean hasNextPage){ bPuO~#iN~
this.hasNextPage = hasNextPage; nM99AW
} ]qEg5:yY
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