Hibernate3 提供了DetachedCriteria,使得我们可以在Web层构造 V:+bq`
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detachedCriteria,然后调用业务层Bean,进行动态条件查询,根 I"!{HnSG`
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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 4CCux4)N
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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 6]3ZUH;
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分页支持类: 0T5>i 0/
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java代码: {V&7JZl,/
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package com.javaeye.common.util; IY:O? M
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import java.util.List; ; n@C(hG
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publicclass PaginationSupport { mc=*wr$
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publicfinalstaticint PAGESIZE = 30; /%c^ i!=f"
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privateint pageSize = PAGESIZE; Ss:,#|
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privateList items; )-{~7@yqZ
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privateint totalCount; rifxr4c[X>
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privateint[] indexes = newint[0]; #jJcgR<
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privateint startIndex = 0; ?Sqm`)\>4
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public PaginationSupport(List items, int F~AS(sk
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totalCount){ a*hThr+$M
setPageSize(PAGESIZE); X
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setTotalCount(totalCount); z,)sS<t(
setItems(items); &^H
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setStartIndex(0); h~@+M5r,
} [
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public PaginationSupport(List items, int -Tx tX8v
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totalCount, int startIndex){ u^9c`
setPageSize(PAGESIZE); w!RH*S
setTotalCount(totalCount); .7FI%
setItems(items); S+G)&<a^
setStartIndex(startIndex); [//f BO
} \sd"iMEi
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public PaginationSupport(List items, int DO1{r/Ib.{
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totalCount, int pageSize, int startIndex){ p#d UL9
setPageSize(pageSize); q1Sm#_7
setTotalCount(totalCount); *F*X_O
setItems(items); zf~zYZSr
setStartIndex(startIndex); t]
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} m-RY{DO+
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publicList getItems(){ &*aU2{,s,;
return items; T6$<o\g'
} cloI 6%5r
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publicvoid setItems(List items){ EC'bgFe
this.items = items; 0Q >|s_
} JZzf,G:
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publicint getPageSize(){ e9_+$Oo
return pageSize; 6sl<Z=E#
} VWy:U#;+8
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publicvoid setPageSize(int pageSize){ lM*O+k
this.pageSize = pageSize; 2H[aY%1T
} =7fh1XnW
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publicint getTotalCount(){ e0HP~&BRs
return totalCount; %}XMhWn{
} }dJ ~Iy
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publicvoid setTotalCount(int totalCount){ 3gy;$}Lq T
if(totalCount > 0){ N RSse"
this.totalCount = totalCount; QV$dKjMS
int count = totalCount / B5HdC%8/}
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pageSize; f+Me dc~
if(totalCount % pageSize > 0) -/c1qLdQ
count++; j#P4Le[t
indexes = newint[count]; tcEf
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for(int i = 0; i < count; i++){ lO> 7`2x=F
indexes = pageSize * HF+fk*_Q
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} cGta4;
}else{ kZ-~
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this.totalCount = 0; w s>Iyw.u
} }#>d2 =T$
} n "KJB
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publicint[] getIndexes(){ FR^wDm$
return indexes; h_G|.7!
} 9~'Ip7X,!
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publicvoid setIndexes(int[] indexes){ "Vp:z V<S
this.indexes = indexes; -!G#")<
} ,
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publicint getStartIndex(){ Qfu*F}
return startIndex; 2G5!u)
} ku9FN
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publicvoid setStartIndex(int startIndex){ >m6,xxTR
if(totalCount <= 0) yn":!4U1
this.startIndex = 0; SA
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elseif(startIndex >= totalCount) 2mU-LQ1WN
this.startIndex = indexes zGd*Q5l
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[indexes.length - 1]; GVc[p\h(
elseif(startIndex < 0) /\uH[[s
this.startIndex = 0; .Xz"NyW
else{ #u5;utY:F
this.startIndex = indexes S%s|P=u
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[startIndex / pageSize]; ]AA*f_!
} r]EZ)qp^@
} X:-bAu}D
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publicint getNextIndex(){ ~uZLe\>K
int nextIndex = getStartIndex() + VfC[U)w*vm
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pageSize; $CwTNm?
if(nextIndex >= totalCount) d>b,aj(
return getStartIndex(); NT9- j#V
else !na0 Y
return nextIndex; hOL y*%
} >`?+FDOJ,
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publicint getPreviousIndex(){ V<NsmC=g
int previousIndex = getStartIndex() - b:5%}
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pageSize; }Oh'YX#[
if(previousIndex < 0) (:bCOEZ
return0; *ez~~ Y
else '"fU2M<.
return previousIndex; nP{sCH 1
} Z=Y_;dS9
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} \%?8jQ'tX
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抽象业务类 ])ALAAIc-
java代码: 031.u<_
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/** Gp3nR<+
* Created on 2005-7-12 `ToRkk&&>{
*/ k1Mxsd
package com.javaeye.common.business; Gg pQ]rw
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import java.io.Serializable; sHPwW5j/o'
import java.util.List; 0jJ28.kOp
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import org.hibernate.Criteria; wI]R+.
import org.hibernate.HibernateException; 60~>f)vu
import org.hibernate.Session; b^l
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import org.hibernate.criterion.DetachedCriteria; ;$tv8%_L[
import org.hibernate.criterion.Projections; q~'
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import Yx}"> ;\
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org.springframework.orm.hibernate3.HibernateCallback; 5IE+M
import uM#U!
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org.springframework.orm.hibernate3.support.HibernateDaoS gC_s\WU
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upport; kSDa\l!W]
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import com.javaeye.common.util.PaginationSupport; _Dcc<-.
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public abstract class AbstractManager extends oA3W
{
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HibernateDaoSupport { .M53, 8X
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privateboolean cacheQueries = false; 9p\wTzA
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privateString queryCacheRegion; {7![3`%7
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publicvoid setCacheQueries(boolean AR+\uD=\I-
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cacheQueries){ sAjKf\][
this.cacheQueries = cacheQueries; $G-N0LV
} N9JgV,`
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publicvoid setQueryCacheRegion(String & L.PU@
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queryCacheRegion){ y5AXL5
this.queryCacheRegion = LcpyW=)}"V
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queryCacheRegion; rMXOwkE
} /!{A=N
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publicvoid save(finalObject entity){ =FD`A#\C~
getHibernateTemplate().save(entity); ReB(T7Vk=
} 4Fr7jD,#k
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publicvoid persist(finalObject entity){ FG;<`4mY
getHibernateTemplate().save(entity); B=Zukg1G
} hV>4D&<
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publicvoid update(finalObject entity){ sx-Hw4.a"
getHibernateTemplate().update(entity); I"F
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} ><#2O
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publicvoid delete(finalObject entity){ J^g,jBk
getHibernateTemplate().delete(entity); 0,~6TV<K
} GOZQ5m
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publicObject load(finalClass entity, vU8FHVytV
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finalSerializable id){ M]4 =(Vv+5
return getHibernateTemplate().load h[-d1bKwS
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(entity, id); b5n]Gp
} ].k+Nzf_
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publicObject get(finalClass entity, MKVfy:g%So
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finalSerializable id){ M ~ i+F0
return getHibernateTemplate().get Q2[prrk%j
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(entity, id); 4(Cd
} zU4V^N'
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publicList findAll(finalClass entity){ 'Ffy8z{&3
return getHibernateTemplate().find("from OZ>)sL
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" + entity.getName()); (/"K+$8'
} nI` f_sp
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publicList findByNamedQuery(finalString 6=G~6Qu
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namedQuery){ ^8';8+$
return getHibernateTemplate $IxU6=ajn
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().findByNamedQuery(namedQuery); mX<Fuu}E*Z
} AK@`'$
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publicList findByNamedQuery(finalString query, jSwtf
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finalObject parameter){ Z#OhYm+y
return getHibernateTemplate /i-xX*
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().findByNamedQuery(query, parameter); o[bE
} 96"yNqBf
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publicList findByNamedQuery(finalString query, ;0w ^ud
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finalObject[] parameters){ S'
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return getHibernateTemplate @)W(q5)}9"
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().findByNamedQuery(query, parameters); (B_7\}v|_
} jb|mip@`
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publicList find(finalString query){ e-CNQnO~
return getHibernateTemplate().find X$7Oo^1;
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(query); A9\]3 LY
} 7SgweZ}"
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publicList find(finalString query, finalObject ibd$%;bX3
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parameter){ g.B%#bfg
return getHibernateTemplate().find j4~7akG
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(query, parameter); >lD;0EN
} (O)\#%,@R
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public PaginationSupport findPageByCriteria uipq=Yp.
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(final DetachedCriteria detachedCriteria){ jOUK]>ox:
return findPageByCriteria DA<F{n.Z:
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(detachedCriteria, PaginationSupport.PAGESIZE, 0); !_CX2|
} kzZDtI)
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public PaginationSupport findPageByCriteria :a_BD
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(final DetachedCriteria detachedCriteria, finalint A}t %;V2
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startIndex){ )E'Fke
return findPageByCriteria /y}"M
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(detachedCriteria, PaginationSupport.PAGESIZE, L'zE<3O'3
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startIndex); y[:
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} /@ y;iJk;
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public PaginationSupport findPageByCriteria c |>=S)|
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(final DetachedCriteria detachedCriteria, finalint '3A+"k-}mh
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pageSize, K(<$.
finalint startIndex){ 8zhBA9Y#~
return(PaginationSupport) y }\r#"Z`
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getHibernateTemplate().execute(new HibernateCallback(){ ~9Zh,p;
publicObject doInHibernate QX[Djz0H8
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(Session session)throws HibernateException { WfTD7?\dw
Criteria criteria = 6cM<>&e
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detachedCriteria.getExecutableCriteria(session);
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int totalCount = tawe Gc%~
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((Integer) criteria.setProjection(Projections.rowCount Pm4e8b
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()).uniqueResult()).intValue(); g>so
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criteria.setProjection 9YB2e84j
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(null); U^MuZ
List items = .%q$d d>>
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criteria.setFirstResult(startIndex).setMaxResults tR kF
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(pageSize).list(); a 6%@d_A
PaginationSupport ps = bW53" `X
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new PaginationSupport(items, totalCount, pageSize, [ `7%sn]$
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startIndex); v:E;^$6Vn
return ps; Yu'a<5f
} L>dkrr)e
}, true); 74+A+SK[
} (S`6Q
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public List findAllByCriteria(final
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DetachedCriteria detachedCriteria){ U&X2cR &a
return(List) getHibernateTemplate YutQ ]zYA.
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().execute(new HibernateCallback(){ nZfs=@w:y
publicObject doInHibernate U@'F%nHw
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(Session session)throws HibernateException { fAGctRGH
Criteria criteria = `H\)e%]
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detachedCriteria.getExecutableCriteria(session); "+)K |9T#
return criteria.list(); OOnX`
} g+xw$A ou
}, true); Ve}[XqdS^p
} =!BobC- [b
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public int getCountByCriteria(final ks*Y9D*=
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DetachedCriteria detachedCriteria){ u)a'
Integer count = (Integer) ,>n%
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getHibernateTemplate().execute(new HibernateCallback(){ >c4/?YV
publicObject doInHibernate v?%LQKO
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(Session session)throws HibernateException { ?s?$d&h
Criteria criteria = =7%oE[
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detachedCriteria.getExecutableCriteria(session); !nd*W"_gQ/
return @Y}uZ'jt'
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criteria.setProjection(Projections.rowCount d H?
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()).uniqueResult(); 7\ypW $Ot
} PY`L$e
}, true); 1svi8wh
return count.intValue(); 9xFO]Y"
} Pao%pA.<
} KVkMU?6
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用户在web层构造查询条件detachedCriteria,和可选的 Zp&@h-%YoD
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startIndex,调用业务bean的相应findByCriteria方法,返回一个 S|em[D[Y^
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PaginationSupport的实例ps。 `]=oo%(h
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ps.getItems()得到已分页好的结果集 ['q&@_d7
ps.getIndexes()得到分页索引的数组 c3)C{9T](
ps.getTotalCount()得到总结果数 e)H!uR
ps.getStartIndex()当前分页索引 4nqoZk^R
ps.getNextIndex()下一页索引 w8Vw1wW
ps.getPreviousIndex()上一页索引 bc I']WgB-
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连续看了两篇robbin有关DetachedCriteria的介绍,感觉真的不错 g5Z#xszj+
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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 qQ0C ?
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一下代码重构了。 ua5?(,E`']
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我把原本我的做法也提供出来供大家讨论吧: C3'rtY.
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首先,为了实现分页查询,我封装了一个Page类: XL$* _c <)
java代码: O(z}H}Fv
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/*Created on 2005-4-14*/ HYK!}&
package org.flyware.util.page; ]Mi.f3QlO6
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/** \4d.sy0&>-
* @author Joa 0d^Z uTN
* l;A,0,i
*/ p\p\q(S">
publicclass Page { e@#kRklV&
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/** imply if the page has previous page */ L<V3KS2y
privateboolean hasPrePage; +7V{ABfGl
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/** imply if the page has next page */ *sw7niw
privateboolean hasNextPage; O#a6+W"U
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/** the number of every page */ N K]B?
privateint everyPage; V 9wI\0
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/** the total page number */ w
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privateint totalPage; SqA
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/** the number of current page */ Ih}1%Jq
privateint currentPage; b5G}3)'w
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/** the begin index of the records by the current |RkcDrB~
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query */ /93l74.w
privateint beginIndex; d[ >`")2)
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/** The default constructor */ i':i_kU
public Page(){ gi/@j
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} &,\=3'
}R[#?ty;]
/** construct the page by everyPage $?G"GQ!.
* @param everyPage g>rp@M
* */ l%ayI
public Page(int everyPage){ #1 1NPo9
this.everyPage = everyPage; Uxfl_@lJ
} 57a2^
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/** The whole constructor */ "gtHTqheH
public Page(boolean hasPrePage, boolean hasNextPage, [H<bh%
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int everyPage, int totalPage, #`TgZKDg2
int currentPage, int beginIndex){ NcOPL\
this.hasPrePage = hasPrePage; Rlnbdb;!k
this.hasNextPage = hasNextPage; `1*nL,i
this.everyPage = everyPage; %CwL:.|
this.totalPage = totalPage; bzDIhnw
this.currentPage = currentPage; 8P7"&VYc8
this.beginIndex = beginIndex; ml0.$z
} v2r&('pV
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/** >d"3<S ;b
* @return (&|_quP7O
* Returns the beginIndex. @E( 7V(m/
*/ HoV^Y6
publicint getBeginIndex(){ d)cOhZy
return beginIndex; '{I_\~*
} =deMd`=J
fDE%R={!n5
/** C51bc6V
* @param beginIndex CQ`=V2:"ON
* The beginIndex to set. LE5.b]tv2
*/ ~R$~&x